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authorH. Peter Anvin <hpa@zytor.com>2007-07-11 15:18:58 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-12 13:55:56 -0400
commitc39736823232bc3ca113c8228fa852c09fba300e (patch)
tree94fe2f8b27879cee904b09d1effb91ccc3ce6e0a /arch/i386
parent91a6c462b02d8dc02dbe95e5a407d78078a38d01 (diff)
Remove old i386 setup code
This removes the old i386 setup code. This is done as a separate patch to avoid breaking git bisect as some of the i386 code was also used by the old x86-64 code. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/boot/bootsect.S98
-rw-r--r--arch/i386/boot/edd.S231
-rw-r--r--arch/i386/boot/setup.S1075
-rw-r--r--arch/i386/boot/video.S2043
-rw-r--r--arch/i386/kernel/verify_cpu.S94
5 files changed, 0 insertions, 3541 deletions
diff --git a/arch/i386/boot/bootsect.S b/arch/i386/boot/bootsect.S
deleted file mode 100644
index 011b7a4993d4..000000000000
--- a/arch/i386/boot/bootsect.S
+++ /dev/null
@@ -1,98 +0,0 @@
1/*
2 * bootsect.S Copyright (C) 1991, 1992 Linus Torvalds
3 *
4 * modified by Drew Eckhardt
5 * modified by Bruce Evans (bde)
6 * modified by Chris Noe (May 1999) (as86 -> gas)
7 * gutted by H. Peter Anvin (Jan 2003)
8 *
9 * BIG FAT NOTE: We're in real mode using 64k segments. Therefore segment
10 * addresses must be multiplied by 16 to obtain their respective linear
11 * addresses. To avoid confusion, linear addresses are written using leading
12 * hex while segment addresses are written as segment:offset.
13 *
14 */
15
16#include <asm/boot.h>
17
18SETUPSECTS = 4 /* default nr of setup-sectors */
19BOOTSEG = 0x07C0 /* original address of boot-sector */
20INITSEG = DEF_INITSEG /* we move boot here - out of the way */
21SETUPSEG = DEF_SETUPSEG /* setup starts here */
22SYSSEG = DEF_SYSSEG /* system loaded at 0x10000 (65536) */
23SYSSIZE = DEF_SYSSIZE /* system size: # of 16-byte clicks */
24 /* to be loaded */
25ROOT_DEV = 0 /* ROOT_DEV is now written by "build" */
26SWAP_DEV = 0 /* SWAP_DEV is now written by "build" */
27
28#ifndef SVGA_MODE
29#define SVGA_MODE ASK_VGA
30#endif
31
32#ifndef RAMDISK
33#define RAMDISK 0
34#endif
35
36#ifndef ROOT_RDONLY
37#define ROOT_RDONLY 1
38#endif
39
40.code16
41.text
42
43.global _start
44_start:
45
46 # Normalize the start address
47 jmpl $BOOTSEG, $start2
48
49start2:
50 movw %cs, %ax
51 movw %ax, %ds
52 movw %ax, %es
53 movw %ax, %ss
54 movw $0x7c00, %sp
55 sti
56 cld
57
58 movw $bugger_off_msg, %si
59
60msg_loop:
61 lodsb
62 andb %al, %al
63 jz die
64 movb $0xe, %ah
65 movw $7, %bx
66 int $0x10
67 jmp msg_loop
68
69die:
70 # Allow the user to press a key, then reboot
71 xorw %ax, %ax
72 int $0x16
73 int $0x19
74
75 # int 0x19 should never return. In case it does anyway,
76 # invoke the BIOS reset code...
77 ljmp $0xf000,$0xfff0
78
79
80bugger_off_msg:
81 .ascii "Direct booting from floppy is no longer supported.\r\n"
82 .ascii "Please use a boot loader program instead.\r\n"
83 .ascii "\n"
84 .ascii "Remove disk and press any key to reboot . . .\r\n"
85 .byte 0
86
87
88 # Kernel attributes; used by setup
89
90 .org 497
91setup_sects: .byte SETUPSECTS
92root_flags: .word ROOT_RDONLY
93syssize: .word SYSSIZE
94swap_dev: .word SWAP_DEV
95ram_size: .word RAMDISK
96vid_mode: .word SVGA_MODE
97root_dev: .word ROOT_DEV
98boot_flag: .word 0xAA55
diff --git a/arch/i386/boot/edd.S b/arch/i386/boot/edd.S
deleted file mode 100644
index 34321368011a..000000000000
--- a/arch/i386/boot/edd.S
+++ /dev/null
@@ -1,231 +0,0 @@
1/*
2 * BIOS Enhanced Disk Drive support
3 * Copyright (C) 2002, 2003, 2004 Dell, Inc.
4 * by Matt Domsch <Matt_Domsch@dell.com> October 2002
5 * conformant to T13 Committee www.t13.org
6 * projects 1572D, 1484D, 1386D, 1226DT
7 * disk signature read by Matt Domsch <Matt_Domsch@dell.com>
8 * and Andrew Wilks <Andrew_Wilks@dell.com> September 2003, June 2004
9 * legacy CHS retrieval by Patrick J. LoPresti <patl@users.sourceforge.net>
10 * March 2004
11 * Command line option parsing, Matt Domsch, November 2004
12 */
13
14#include <linux/edd.h>
15#include <asm/setup.h>
16
17#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
18
19# It is assumed that %ds == INITSEG here
20
21 movb $0, (EDD_MBR_SIG_NR_BUF)
22 movb $0, (EDDNR)
23
24# Check the command line for options:
25# edd=of disables EDD completely (edd=off)
26# edd=sk skips the MBR test (edd=skipmbr)
27# edd=on re-enables EDD (edd=on)
28
29 pushl %esi
30 movw $edd_mbr_sig_start, %di # Default to edd=on
31
32 movl %cs:(cmd_line_ptr), %esi
33 andl %esi, %esi
34 jz old_cl # Old boot protocol?
35
36# Convert to a real-mode pointer in fs:si
37 movl %esi, %eax
38 shrl $4, %eax
39 movw %ax, %fs
40 andw $0xf, %si
41 jmp have_cl_pointer
42
43# Old-style boot protocol?
44old_cl:
45 push %ds # aka INITSEG
46 pop %fs
47
48 cmpw $0xa33f, (0x20)
49 jne done_cl # No command line at all?
50 movw (0x22), %si # Pointer relative to INITSEG
51
52# fs:si has the pointer to the command line now
53have_cl_pointer:
54
55# Loop through kernel command line one byte at a time. Just in
56# case the loader is buggy and failed to null-terminate the command line
57# terminate if we get close enough to the end of the segment that we
58# cannot fit "edd=XX"...
59cl_atspace:
60 cmpw $-5, %si # Watch for segment wraparound
61 jae done_cl
62 movl %fs:(%si), %eax
63 andb %al, %al # End of line?
64 jz done_cl
65 cmpl $EDD_CL_EQUALS, %eax
66 jz found_edd_equals
67 cmpb $0x20, %al # <= space consider whitespace
68 ja cl_skipword
69 incw %si
70 jmp cl_atspace
71
72cl_skipword:
73 cmpw $-5, %si # Watch for segment wraparound
74 jae done_cl
75 movb %fs:(%si), %al # End of string?
76 andb %al, %al
77 jz done_cl
78 cmpb $0x20, %al
79 jbe cl_atspace
80 incw %si
81 jmp cl_skipword
82
83found_edd_equals:
84# only looking at first two characters after equals
85# late overrides early on the command line, so keep going after finding something
86 movw %fs:4(%si), %ax
87 cmpw $EDD_CL_OFF, %ax # edd=of
88 je do_edd_off
89 cmpw $EDD_CL_SKIP, %ax # edd=sk
90 je do_edd_skipmbr
91 cmpw $EDD_CL_ON, %ax # edd=on
92 je do_edd_on
93 jmp cl_skipword
94do_edd_skipmbr:
95 movw $edd_start, %di
96 jmp cl_skipword
97do_edd_off:
98 movw $edd_done, %di
99 jmp cl_skipword
100do_edd_on:
101 movw $edd_mbr_sig_start, %di
102 jmp cl_skipword
103
104done_cl:
105 popl %esi
106 jmpw *%di
107
108# Read the first sector of each BIOS disk device and store the 4-byte signature
109edd_mbr_sig_start:
110 movb $0x80, %dl # from device 80
111 movw $EDD_MBR_SIG_BUF, %bx # store buffer ptr in bx
112edd_mbr_sig_read:
113 movl $0xFFFFFFFF, %eax
114 movl %eax, (%bx) # assume failure
115 pushw %bx
116 movb $READ_SECTORS, %ah
117 movb $1, %al # read 1 sector
118 movb $0, %dh # at head 0
119 movw $1, %cx # cylinder 0, sector 0
120 pushw %es
121 pushw %ds
122 popw %es
123 movw $EDDBUF, %bx # disk's data goes into EDDBUF
124 pushw %dx # work around buggy BIOSes
125 stc # work around buggy BIOSes
126 int $0x13
127 sti # work around buggy BIOSes
128 popw %dx
129 popw %es
130 popw %bx
131 jc edd_mbr_sig_done # on failure, we're done.
132 cmpb $0, %ah # some BIOSes do not set CF
133 jne edd_mbr_sig_done # on failure, we're done.
134 movl (EDDBUF+EDD_MBR_SIG_OFFSET), %eax # read sig out of the MBR
135 movl %eax, (%bx) # store success
136 incb (EDD_MBR_SIG_NR_BUF) # note that we stored something
137 incb %dl # increment to next device
138 addw $4, %bx # increment sig buffer ptr
139 cmpb $EDD_MBR_SIG_MAX, (EDD_MBR_SIG_NR_BUF) # Out of space?
140 jb edd_mbr_sig_read # keep looping
141edd_mbr_sig_done:
142
143# Do the BIOS Enhanced Disk Drive calls
144# This consists of two calls:
145# int 13h ah=41h "Check Extensions Present"
146# int 13h ah=48h "Get Device Parameters"
147# int 13h ah=08h "Legacy Get Device Parameters"
148#
149# A buffer of size EDDMAXNR*(EDDEXTSIZE+EDDPARMSIZE) is reserved for our use
150# in the boot_params at EDDBUF. The first four bytes of which are
151# used to store the device number, interface support map and version
152# results from fn41. The next four bytes are used to store the legacy
153# cylinders, heads, and sectors from fn08. The following 74 bytes are used to
154# store the results from fn48. Starting from device 80h, fn41, then fn48
155# are called and their results stored in EDDBUF+n*(EDDEXTSIZE+EDDPARMIZE).
156# Then the pointer is incremented to store the data for the next call.
157# This repeats until either a device doesn't exist, or until EDDMAXNR
158# devices have been stored.
159# The one tricky part is that ds:si always points EDDEXTSIZE bytes into
160# the structure, and the fn41 and fn08 results are stored at offsets
161# from there. This removes the need to increment the pointer for
162# every store, and leaves it ready for the fn48 call.
163# A second one-byte buffer, EDDNR, in the boot_params stores
164# the number of BIOS devices which exist, up to EDDMAXNR.
165# In setup.c, copy_edd() stores both boot_params buffers away
166# for later use, as they would get overwritten otherwise.
167# This code is sensitive to the size of the structs in edd.h
168edd_start:
169 # %ds points to the bootsector
170 # result buffer for fn48
171 movw $EDDBUF+EDDEXTSIZE, %si # in ds:si, fn41 results
172 # kept just before that
173 movb $0x80, %dl # BIOS device 0x80
174
175edd_check_ext:
176 movb $CHECKEXTENSIONSPRESENT, %ah # Function 41
177 movw $EDDMAGIC1, %bx # magic
178 int $0x13 # make the call
179 jc edd_done # no more BIOS devices
180
181 cmpw $EDDMAGIC2, %bx # is magic right?
182 jne edd_next # nope, next...
183
184 movb %dl, %ds:-8(%si) # store device number
185 movb %ah, %ds:-7(%si) # store version
186 movw %cx, %ds:-6(%si) # store extensions
187 incb (EDDNR) # note that we stored something
188
189edd_get_device_params:
190 movw $EDDPARMSIZE, %ds:(%si) # put size
191 movw $0x0, %ds:2(%si) # work around buggy BIOSes
192 movb $GETDEVICEPARAMETERS, %ah # Function 48
193 int $0x13 # make the call
194 # Don't check for fail return
195 # it doesn't matter.
196edd_get_legacy_chs:
197 xorw %ax, %ax
198 movw %ax, %ds:-4(%si)
199 movw %ax, %ds:-2(%si)
200 # Ralf Brown's Interrupt List says to set ES:DI to
201 # 0000h:0000h "to guard against BIOS bugs"
202 pushw %es
203 movw %ax, %es
204 movw %ax, %di
205 pushw %dx # legacy call clobbers %dl
206 movb $LEGACYGETDEVICEPARAMETERS, %ah # Function 08
207 int $0x13 # make the call
208 jc edd_legacy_done # failed
209 movb %cl, %al # Low 6 bits are max
210 andb $0x3F, %al # sector number
211 movb %al, %ds:-1(%si) # Record max sect
212 movb %dh, %ds:-2(%si) # Record max head number
213 movb %ch, %al # Low 8 bits of max cyl
214 shr $6, %cl
215 movb %cl, %ah # High 2 bits of max cyl
216 movw %ax, %ds:-4(%si)
217
218edd_legacy_done:
219 popw %dx
220 popw %es
221 movw %si, %ax # increment si
222 addw $EDDPARMSIZE+EDDEXTSIZE, %ax
223 movw %ax, %si
224
225edd_next:
226 incb %dl # increment to next device
227 cmpb $EDDMAXNR, (EDDNR) # Out of space?
228 jb edd_check_ext # keep looping
229
230edd_done:
231#endif
diff --git a/arch/i386/boot/setup.S b/arch/i386/boot/setup.S
deleted file mode 100644
index 6dbcc95b2120..000000000000
--- a/arch/i386/boot/setup.S
+++ /dev/null
@@ -1,1075 +0,0 @@
1/*
2 * setup.S Copyright (C) 1991, 1992 Linus Torvalds
3 *
4 * setup.s is responsible for getting the system data from the BIOS,
5 * and putting them into the appropriate places in system memory.
6 * both setup.s and system has been loaded by the bootblock.
7 *
8 * This code asks the bios for memory/disk/other parameters, and
9 * puts them in a "safe" place: 0x90000-0x901FF, ie where the
10 * boot-block used to be. It is then up to the protected mode
11 * system to read them from there before the area is overwritten
12 * for buffer-blocks.
13 *
14 * Move PS/2 aux init code to psaux.c
15 * (troyer@saifr00.cfsat.Honeywell.COM) 03Oct92
16 *
17 * some changes and additional features by Christoph Niemann,
18 * March 1993/June 1994 (Christoph.Niemann@linux.org)
19 *
20 * add APM BIOS checking by Stephen Rothwell, May 1994
21 * (sfr@canb.auug.org.au)
22 *
23 * High load stuff, initrd support and position independency
24 * by Hans Lermen & Werner Almesberger, February 1996
25 * <lermen@elserv.ffm.fgan.de>, <almesber@lrc.epfl.ch>
26 *
27 * Video handling moved to video.S by Martin Mares, March 1996
28 * <mj@k332.feld.cvut.cz>
29 *
30 * Extended memory detection scheme retwiddled by orc@pell.chi.il.us (david
31 * parsons) to avoid loadlin confusion, July 1997
32 *
33 * Transcribed from Intel (as86) -> AT&T (gas) by Chris Noe, May 1999.
34 * <stiker@northlink.com>
35 *
36 * Fix to work around buggy BIOSes which don't use carry bit correctly
37 * and/or report extended memory in CX/DX for e801h memory size detection
38 * call. As a result the kernel got wrong figures. The int15/e801h docs
39 * from Ralf Brown interrupt list seem to indicate AX/BX should be used
40 * anyway. So to avoid breaking many machines (presumably there was a reason
41 * to orginally use CX/DX instead of AX/BX), we do a kludge to see
42 * if CX/DX have been changed in the e801 call and if so use AX/BX .
43 * Michael Miller, April 2001 <michaelm@mjmm.org>
44 *
45 * New A20 code ported from SYSLINUX by H. Peter Anvin. AMD Elan bugfixes
46 * by Robert Schwebel, December 2001 <robert@schwebel.de>
47 */
48
49#include <asm/segment.h>
50#include <linux/utsrelease.h>
51#include <linux/compile.h>
52#include <asm/boot.h>
53#include <asm/e820.h>
54#include <asm/page.h>
55#include <asm/setup.h>
56
57/* Signature words to ensure LILO loaded us right */
58#define SIG1 0xAA55
59#define SIG2 0x5A5A
60
61INITSEG = DEF_INITSEG # 0x9000, we move boot here, out of the way
62SYSSEG = DEF_SYSSEG # 0x1000, system loaded at 0x10000 (65536).
63SETUPSEG = DEF_SETUPSEG # 0x9020, this is the current segment
64 # ... and the former contents of CS
65
66DELTA_INITSEG = SETUPSEG - INITSEG # 0x0020
67
68.code16
69.globl begtext, begdata, begbss, endtext, enddata, endbss
70
71.text
72begtext:
73.data
74begdata:
75.bss
76begbss:
77.text
78
79start:
80 jmp trampoline
81
82# This is the setup header, and it must start at %cs:2 (old 0x9020:2)
83
84 .ascii "HdrS" # header signature
85 .word 0x0206 # header version number (>= 0x0105)
86 # or else old loadlin-1.5 will fail)
87realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
88start_sys_seg: .word SYSSEG
89 .word kernel_version # pointing to kernel version string
90 # above section of header is compatible
91 # with loadlin-1.5 (header v1.5). Don't
92 # change it.
93
94type_of_loader: .byte 0 # = 0, old one (LILO, Loadlin,
95 # Bootlin, SYSLX, bootsect...)
96 # See Documentation/i386/boot.txt for
97 # assigned ids
98
99# flags, unused bits must be zero (RFU) bit within loadflags
100loadflags:
101LOADED_HIGH = 1 # If set, the kernel is loaded high
102CAN_USE_HEAP = 0x80 # If set, the loader also has set
103 # heap_end_ptr to tell how much
104 # space behind setup.S can be used for
105 # heap purposes.
106 # Only the loader knows what is free
107#ifndef __BIG_KERNEL__
108 .byte 0
109#else
110 .byte LOADED_HIGH
111#endif
112
113setup_move_size: .word 0x8000 # size to move, when setup is not
114 # loaded at 0x90000. We will move setup
115 # to 0x90000 then just before jumping
116 # into the kernel. However, only the
117 # loader knows how much data behind
118 # us also needs to be loaded.
119
120code32_start: # here loaders can put a different
121 # start address for 32-bit code.
122#ifndef __BIG_KERNEL__
123 .long 0x1000 # 0x1000 = default for zImage
124#else
125 .long 0x100000 # 0x100000 = default for big kernel
126#endif
127
128ramdisk_image: .long 0 # address of loaded ramdisk image
129 # Here the loader puts the 32-bit
130 # address where it loaded the image.
131 # This only will be read by the kernel.
132
133ramdisk_size: .long 0 # its size in bytes
134
135bootsect_kludge:
136 .long 0 # obsolete
137
138heap_end_ptr: .word modelist+1024 # (Header version 0x0201 or later)
139 # space from here (exclusive) down to
140 # end of setup code can be used by setup
141 # for local heap purposes.
142
143pad1: .word 0
144cmd_line_ptr: .long 0 # (Header version 0x0202 or later)
145 # If nonzero, a 32-bit pointer
146 # to the kernel command line.
147 # The command line should be
148 # located between the start of
149 # setup and the end of low
150 # memory (0xa0000), or it may
151 # get overwritten before it
152 # gets read. If this field is
153 # used, there is no longer
154 # anything magical about the
155 # 0x90000 segment; the setup
156 # can be located anywhere in
157 # low memory 0x10000 or higher.
158
159ramdisk_max: .long (-__PAGE_OFFSET-(512 << 20)-1) & 0x7fffffff
160 # (Header version 0x0203 or later)
161 # The highest safe address for
162 # the contents of an initrd
163
164kernel_alignment: .long CONFIG_PHYSICAL_ALIGN #physical addr alignment
165 #required for protected mode
166 #kernel
167#ifdef CONFIG_RELOCATABLE
168relocatable_kernel: .byte 1
169#else
170relocatable_kernel: .byte 0
171#endif
172pad2: .byte 0
173pad3: .word 0
174
175cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line,
176 #added with boot protocol
177 #version 2.06
178
179trampoline: call start_of_setup
180 .align 16
181 # The offset at this point is 0x240
182 .space (0xeff-0x240+1) # E820 & EDD space (ending at 0xeff)
183# End of setup header #####################################################
184
185start_of_setup:
186# Bootlin depends on this being done early
187 movw $0x01500, %ax
188 movb $0x81, %dl
189 int $0x13
190
191#ifdef SAFE_RESET_DISK_CONTROLLER
192# Reset the disk controller.
193 movw $0x0000, %ax
194 movb $0x80, %dl
195 int $0x13
196#endif
197
198# Set %ds = %cs, we know that SETUPSEG = %cs at this point
199 movw %cs, %ax # aka SETUPSEG
200 movw %ax, %ds
201# Check signature at end of setup
202 cmpw $SIG1, setup_sig1
203 jne bad_sig
204
205 cmpw $SIG2, setup_sig2
206 jne bad_sig
207
208 jmp good_sig1
209
210# Routine to print asciiz string at ds:si
211prtstr:
212 lodsb
213 andb %al, %al
214 jz fin
215
216 call prtchr
217 jmp prtstr
218
219fin: ret
220
221# Space printing
222prtsp2: call prtspc # Print double space
223prtspc: movb $0x20, %al # Print single space (note: fall-thru)
224
225# Part of above routine, this one just prints ascii al
226prtchr: pushw %ax
227 pushw %cx
228 movw $7,%bx
229 movw $0x01, %cx
230 movb $0x0e, %ah
231 int $0x10
232 popw %cx
233 popw %ax
234 ret
235
236beep: movb $0x07, %al
237 jmp prtchr
238
239no_sig_mess: .string "No setup signature found ..."
240
241good_sig1:
242 jmp good_sig
243
244# We now have to find the rest of the setup code/data
245bad_sig:
246 movw %cs, %ax # SETUPSEG
247 subw $DELTA_INITSEG, %ax # INITSEG
248 movw %ax, %ds
249 xorb %bh, %bh
250 movb (497), %bl # get setup sect from bootsect
251 subw $4, %bx # LILO loads 4 sectors of setup
252 shlw $8, %bx # convert to words (1sect=2^8 words)
253 movw %bx, %cx
254 shrw $3, %bx # convert to segment
255 addw $SYSSEG, %bx
256 movw %bx, %cs:start_sys_seg
257# Move rest of setup code/data to here
258 movw $2048, %di # four sectors loaded by LILO
259 subw %si, %si
260 pushw %cs
261 popw %es
262 movw $SYSSEG, %ax
263 movw %ax, %ds
264 rep
265 movsw
266 movw %cs, %ax # aka SETUPSEG
267 movw %ax, %ds
268 cmpw $SIG1, setup_sig1
269 jne no_sig
270
271 cmpw $SIG2, setup_sig2
272 jne no_sig
273
274 jmp good_sig
275
276no_sig:
277 lea no_sig_mess, %si
278 call prtstr
279
280no_sig_loop:
281 hlt
282 jmp no_sig_loop
283
284good_sig:
285 movw %cs, %ax # aka SETUPSEG
286 subw $DELTA_INITSEG, %ax # aka INITSEG
287 movw %ax, %ds
288# Check if an old loader tries to load a big-kernel
289 testb $LOADED_HIGH, %cs:loadflags # Do we have a big kernel?
290 jz loader_ok # No, no danger for old loaders.
291
292 cmpb $0, %cs:type_of_loader # Do we have a loader that
293 # can deal with us?
294 jnz loader_ok # Yes, continue.
295
296 pushw %cs # No, we have an old loader,
297 popw %ds # die.
298 lea loader_panic_mess, %si
299 call prtstr
300
301 jmp no_sig_loop
302
303loader_panic_mess: .string "Wrong loader, giving up..."
304
305# check minimum cpuid
306# we do this here because it is the last place we can actually
307# show a user visible error message. Later the video modus
308# might be already messed up.
309loader_ok:
310 call verify_cpu
311 testl %eax,%eax
312 jz cpu_ok
313 movw %cs,%ax # aka SETUPSEG
314 movw %ax,%ds
315 lea cpu_panic_mess,%si
316 call prtstr
3171: jmp 1b
318
319cpu_panic_mess:
320 .asciz "PANIC: CPU too old for this kernel."
321
322#include "../kernel/verify_cpu.S"
323
324cpu_ok:
325# Get memory size (extended mem, kB)
326
327 xorl %eax, %eax
328 movl %eax, (0x1e0)
329#ifndef STANDARD_MEMORY_BIOS_CALL
330 movb %al, (E820NR)
331# Try three different memory detection schemes. First, try
332# e820h, which lets us assemble a memory map, then try e801h,
333# which returns a 32-bit memory size, and finally 88h, which
334# returns 0-64m
335
336# method E820H:
337# the memory map from hell. e820h returns memory classified into
338# a whole bunch of different types, and allows memory holes and
339# everything. We scan through this memory map and build a list
340# of the first 32 memory areas, which we return at [E820MAP].
341# This is documented at http://www.acpi.info/, in the ACPI 2.0 specification.
342
343#define SMAP 0x534d4150
344
345meme820:
346 xorl %ebx, %ebx # continuation counter
347 movw $E820MAP, %di # point into the whitelist
348 # so we can have the bios
349 # directly write into it.
350
351jmpe820:
352 movl $0x0000e820, %eax # e820, upper word zeroed
353 movl $SMAP, %edx # ascii 'SMAP'
354 movl $20, %ecx # size of the e820rec
355 pushw %ds # data record.
356 popw %es
357 int $0x15 # make the call
358 jc bail820 # fall to e801 if it fails
359
360 cmpl $SMAP, %eax # check the return is `SMAP'
361 jne bail820 # fall to e801 if it fails
362
363# cmpl $1, 16(%di) # is this usable memory?
364# jne again820
365
366 # If this is usable memory, we save it by simply advancing %di by
367 # sizeof(e820rec).
368 #
369good820:
370 movb (E820NR), %al # up to 128 entries
371 cmpb $E820MAX, %al
372 jae bail820
373
374 incb (E820NR)
375 movw %di, %ax
376 addw $20, %ax
377 movw %ax, %di
378again820:
379 cmpl $0, %ebx # check to see if
380 jne jmpe820 # %ebx is set to EOF
381bail820:
382
383
384# method E801H:
385# memory size is in 1k chunksizes, to avoid confusing loadlin.
386# we store the 0xe801 memory size in a completely different place,
387# because it will most likely be longer than 16 bits.
388# (use 1e0 because that's what Larry Augustine uses in his
389# alternative new memory detection scheme, and it's sensible
390# to write everything into the same place.)
391
392meme801:
393 stc # fix to work around buggy
394 xorw %cx,%cx # BIOSes which don't clear/set
395 xorw %dx,%dx # carry on pass/error of
396 # e801h memory size call
397 # or merely pass cx,dx though
398 # without changing them.
399 movw $0xe801, %ax
400 int $0x15
401 jc mem88
402
403 cmpw $0x0, %cx # Kludge to handle BIOSes
404 jne e801usecxdx # which report their extended
405 cmpw $0x0, %dx # memory in AX/BX rather than
406 jne e801usecxdx # CX/DX. The spec I have read
407 movw %ax, %cx # seems to indicate AX/BX
408 movw %bx, %dx # are more reasonable anyway...
409
410e801usecxdx:
411 andl $0xffff, %edx # clear sign extend
412 shll $6, %edx # and go from 64k to 1k chunks
413 movl %edx, (0x1e0) # store extended memory size
414 andl $0xffff, %ecx # clear sign extend
415 addl %ecx, (0x1e0) # and add lower memory into
416 # total size.
417
418# Ye Olde Traditional Methode. Returns the memory size (up to 16mb or
419# 64mb, depending on the bios) in ax.
420mem88:
421
422#endif
423 movb $0x88, %ah
424 int $0x15
425 movw %ax, (2)
426
427# Set the keyboard repeat rate to the max
428 movw $0x0305, %ax
429 xorw %bx, %bx
430 int $0x16
431
432# Check for video adapter and its parameters and allow the
433# user to browse video modes.
434 call video # NOTE: we need %ds pointing
435 # to bootsector
436
437# Get hd0 data...
438 xorw %ax, %ax
439 movw %ax, %ds
440 ldsw (4 * 0x41), %si
441 movw %cs, %ax # aka SETUPSEG
442 subw $DELTA_INITSEG, %ax # aka INITSEG
443 pushw %ax
444 movw %ax, %es
445 movw $0x0080, %di
446 movw $0x10, %cx
447 pushw %cx
448 cld
449 rep
450 movsb
451# Get hd1 data...
452 xorw %ax, %ax
453 movw %ax, %ds
454 ldsw (4 * 0x46), %si
455 popw %cx
456 popw %es
457 movw $0x0090, %di
458 rep
459 movsb
460# Check that there IS a hd1 :-)
461 movw $0x01500, %ax
462 movb $0x81, %dl
463 int $0x13
464 jc no_disk1
465
466 cmpb $3, %ah
467 je is_disk1
468
469no_disk1:
470 movw %cs, %ax # aka SETUPSEG
471 subw $DELTA_INITSEG, %ax # aka INITSEG
472 movw %ax, %es
473 movw $0x0090, %di
474 movw $0x10, %cx
475 xorw %ax, %ax
476 cld
477 rep
478 stosb
479is_disk1:
480# check for Micro Channel (MCA) bus
481 movw %cs, %ax # aka SETUPSEG
482 subw $DELTA_INITSEG, %ax # aka INITSEG
483 movw %ax, %ds
484 xorw %ax, %ax
485 movw %ax, (0xa0) # set table length to 0
486 movb $0xc0, %ah
487 stc
488 int $0x15 # moves feature table to es:bx
489 jc no_mca
490
491 pushw %ds
492 movw %es, %ax
493 movw %ax, %ds
494 movw %cs, %ax # aka SETUPSEG
495 subw $DELTA_INITSEG, %ax # aka INITSEG
496 movw %ax, %es
497 movw %bx, %si
498 movw $0xa0, %di
499 movw (%si), %cx
500 addw $2, %cx # table length is a short
501 cmpw $0x10, %cx
502 jc sysdesc_ok
503
504 movw $0x10, %cx # we keep only first 16 bytes
505sysdesc_ok:
506 rep
507 movsb
508 popw %ds
509no_mca:
510#ifdef CONFIG_X86_VOYAGER
511 movb $0xff, 0x40 # flag on config found
512 movb $0xc0, %al
513 mov $0xff, %ah
514 int $0x15 # put voyager config info at es:di
515 jc no_voyager
516 movw $0x40, %si # place voyager info in apm table
517 cld
518 movw $7, %cx
519voyager_rep:
520 movb %es:(%di), %al
521 movb %al,(%si)
522 incw %di
523 incw %si
524 decw %cx
525 jnz voyager_rep
526no_voyager:
527#endif
528# Check for PS/2 pointing device
529 movw %cs, %ax # aka SETUPSEG
530 subw $DELTA_INITSEG, %ax # aka INITSEG
531 movw %ax, %ds
532 movb $0, (0x1ff) # default is no pointing device
533 int $0x11 # int 0x11: equipment list
534 testb $0x04, %al # check if mouse installed
535 jz no_psmouse
536
537 movb $0xAA, (0x1ff) # device present
538no_psmouse:
539
540#if defined(CONFIG_X86_SPEEDSTEP_SMI) || defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
541 movl $0x0000E980, %eax # IST Support
542 movl $0x47534943, %edx # Request value
543 int $0x15
544
545 movl %eax, (96)
546 movl %ebx, (100)
547 movl %ecx, (104)
548 movl %edx, (108)
549#endif
550
551#if defined(CONFIG_APM) || defined(CONFIG_APM_MODULE)
552# Then check for an APM BIOS...
553 # %ds points to the bootsector
554 movw $0, 0x40 # version = 0 means no APM BIOS
555 movw $0x05300, %ax # APM BIOS installation check
556 xorw %bx, %bx
557 int $0x15
558 jc done_apm_bios # Nope, no APM BIOS
559
560 cmpw $0x0504d, %bx # Check for "PM" signature
561 jne done_apm_bios # No signature, no APM BIOS
562
563 andw $0x02, %cx # Is 32 bit supported?
564 je done_apm_bios # No 32-bit, no (good) APM BIOS
565
566 movw $0x05304, %ax # Disconnect first just in case
567 xorw %bx, %bx
568 int $0x15 # ignore return code
569 movw $0x05303, %ax # 32 bit connect
570 xorl %ebx, %ebx
571 xorw %cx, %cx # paranoia :-)
572 xorw %dx, %dx # ...
573 xorl %esi, %esi # ...
574 xorw %di, %di # ...
575 int $0x15
576 jc no_32_apm_bios # Ack, error.
577
578 movw %ax, (66) # BIOS code segment
579 movl %ebx, (68) # BIOS entry point offset
580 movw %cx, (72) # BIOS 16 bit code segment
581 movw %dx, (74) # BIOS data segment
582 movl %esi, (78) # BIOS code segment lengths
583 movw %di, (82) # BIOS data segment length
584# Redo the installation check as the 32 bit connect
585# modifies the flags returned on some BIOSs
586 movw $0x05300, %ax # APM BIOS installation check
587 xorw %bx, %bx
588 xorw %cx, %cx # paranoia
589 int $0x15
590 jc apm_disconnect # error -> shouldn't happen
591
592 cmpw $0x0504d, %bx # check for "PM" signature
593 jne apm_disconnect # no sig -> shouldn't happen
594
595 movw %ax, (64) # record the APM BIOS version
596 movw %cx, (76) # and flags
597 jmp done_apm_bios
598
599apm_disconnect: # Tidy up
600 movw $0x05304, %ax # Disconnect
601 xorw %bx, %bx
602 int $0x15 # ignore return code
603
604 jmp done_apm_bios
605
606no_32_apm_bios:
607 andw $0xfffd, (76) # remove 32 bit support bit
608done_apm_bios:
609#endif
610
611#include "edd.S"
612
613# Now we want to move to protected mode ...
614 cmpw $0, %cs:realmode_swtch
615 jz rmodeswtch_normal
616
617 lcall *%cs:realmode_swtch
618
619 jmp rmodeswtch_end
620
621rmodeswtch_normal:
622 pushw %cs
623 call default_switch
624
625rmodeswtch_end:
626# Now we move the system to its rightful place ... but we check if we have a
627# big-kernel. In that case we *must* not move it ...
628 testb $LOADED_HIGH, %cs:loadflags
629 jz do_move0 # .. then we have a normal low
630 # loaded zImage
631 # .. or else we have a high
632 # loaded bzImage
633 jmp end_move # ... and we skip moving
634
635do_move0:
636 movw $0x100, %ax # start of destination segment
637 movw %cs, %bp # aka SETUPSEG
638 subw $DELTA_INITSEG, %bp # aka INITSEG
639 movw %cs:start_sys_seg, %bx # start of source segment
640 cld
641do_move:
642 movw %ax, %es # destination segment
643 incb %ah # instead of add ax,#0x100
644 movw %bx, %ds # source segment
645 addw $0x100, %bx
646 subw %di, %di
647 subw %si, %si
648 movw $0x800, %cx
649 rep
650 movsw
651 cmpw %bp, %bx # assume start_sys_seg > 0x200,
652 # so we will perhaps read one
653 # page more than needed, but
654 # never overwrite INITSEG
655 # because destination is a
656 # minimum one page below source
657 jb do_move
658
659end_move:
660# then we load the segment descriptors
661 movw %cs, %ax # aka SETUPSEG
662 movw %ax, %ds
663
664# Check whether we need to be downward compatible with version <=201
665 cmpl $0, cmd_line_ptr
666 jne end_move_self # loader uses version >=202 features
667 cmpb $0x20, type_of_loader
668 je end_move_self # bootsect loader, we know of it
669
670# Boot loader doesnt support boot protocol version 2.02.
671# If we have our code not at 0x90000, we need to move it there now.
672# We also then need to move the params behind it (commandline)
673# Because we would overwrite the code on the current IP, we move
674# it in two steps, jumping high after the first one.
675 movw %cs, %ax
676 cmpw $SETUPSEG, %ax
677 je end_move_self
678
679 cli # make sure we really have
680 # interrupts disabled !
681 # because after this the stack
682 # should not be used
683 subw $DELTA_INITSEG, %ax # aka INITSEG
684 movw %ss, %dx
685 cmpw %ax, %dx
686 jb move_self_1
687
688 addw $INITSEG, %dx
689 subw %ax, %dx # this will go into %ss after
690 # the move
691move_self_1:
692 movw %ax, %ds
693 movw $INITSEG, %ax # real INITSEG
694 movw %ax, %es
695 movw %cs:setup_move_size, %cx
696 std # we have to move up, so we use
697 # direction down because the
698 # areas may overlap
699 movw %cx, %di
700 decw %di
701 movw %di, %si
702 subw $move_self_here+0x200, %cx
703 rep
704 movsb
705 ljmp $SETUPSEG, $move_self_here
706
707move_self_here:
708 movw $move_self_here+0x200, %cx
709 rep
710 movsb
711 movw $SETUPSEG, %ax
712 movw %ax, %ds
713 movw %dx, %ss
714end_move_self: # now we are at the right place
715
716#
717# Enable A20. This is at the very best an annoying procedure.
718# A20 code ported from SYSLINUX 1.52-1.63 by H. Peter Anvin.
719# AMD Elan bug fix by Robert Schwebel.
720#
721
722#if defined(CONFIG_X86_ELAN)
723 movb $0x02, %al # alternate A20 gate
724 outb %al, $0x92 # this works on SC410/SC520
725a20_elan_wait:
726 call a20_test
727 jz a20_elan_wait
728 jmp a20_done
729#endif
730
731
732A20_TEST_LOOPS = 32 # Iterations per wait
733A20_ENABLE_LOOPS = 255 # Total loops to try
734
735
736#ifndef CONFIG_X86_VOYAGER
737a20_try_loop:
738
739 # First, see if we are on a system with no A20 gate.
740a20_none:
741 call a20_test
742 jnz a20_done
743
744 # Next, try the BIOS (INT 0x15, AX=0x2401)
745a20_bios:
746 movw $0x2401, %ax
747 pushfl # Be paranoid about flags
748 int $0x15
749 popfl
750
751 call a20_test
752 jnz a20_done
753
754 # Try enabling A20 through the keyboard controller
755#endif /* CONFIG_X86_VOYAGER */
756a20_kbc:
757 call empty_8042
758
759#ifndef CONFIG_X86_VOYAGER
760 call a20_test # Just in case the BIOS worked
761 jnz a20_done # but had a delayed reaction.
762#endif
763
764 movb $0xD1, %al # command write
765 outb %al, $0x64
766 call empty_8042
767
768 movb $0xDF, %al # A20 on
769 outb %al, $0x60
770 call empty_8042
771
772#ifndef CONFIG_X86_VOYAGER
773 # Wait until a20 really *is* enabled; it can take a fair amount of
774 # time on certain systems; Toshiba Tecras are known to have this
775 # problem.
776a20_kbc_wait:
777 xorw %cx, %cx
778a20_kbc_wait_loop:
779 call a20_test
780 jnz a20_done
781 loop a20_kbc_wait_loop
782
783 # Final attempt: use "configuration port A"
784a20_fast:
785 inb $0x92, %al # Configuration Port A
786 orb $0x02, %al # "fast A20" version
787 andb $0xFE, %al # don't accidentally reset
788 outb %al, $0x92
789
790 # Wait for configuration port A to take effect
791a20_fast_wait:
792 xorw %cx, %cx
793a20_fast_wait_loop:
794 call a20_test
795 jnz a20_done
796 loop a20_fast_wait_loop
797
798 # A20 is still not responding. Try frobbing it again.
799 #
800 decb (a20_tries)
801 jnz a20_try_loop
802
803 movw $a20_err_msg, %si
804 call prtstr
805
806a20_die:
807 hlt
808 jmp a20_die
809
810a20_tries:
811 .byte A20_ENABLE_LOOPS
812
813a20_err_msg:
814 .ascii "linux: fatal error: A20 gate not responding!"
815 .byte 13, 10, 0
816
817 # If we get here, all is good
818a20_done:
819
820#endif /* CONFIG_X86_VOYAGER */
821# set up gdt and idt and 32bit start address
822 lidt idt_48 # load idt with 0,0
823 xorl %eax, %eax # Compute gdt_base
824 movw %ds, %ax # (Convert %ds:gdt to a linear ptr)
825 shll $4, %eax
826 addl %eax, code32
827 addl $gdt, %eax
828 movl %eax, (gdt_48+2)
829 lgdt gdt_48 # load gdt with whatever is
830 # appropriate
831
832# make sure any possible coprocessor is properly reset..
833 xorw %ax, %ax
834 outb %al, $0xf0
835 call delay
836
837 outb %al, $0xf1
838 call delay
839
840# well, that went ok, I hope. Now we mask all interrupts - the rest
841# is done in init_IRQ().
842 movb $0xFF, %al # mask all interrupts for now
843 outb %al, $0xA1
844 call delay
845
846 movb $0xFB, %al # mask all irq's but irq2 which
847 outb %al, $0x21 # is cascaded
848
849# Well, that certainly wasn't fun :-(. Hopefully it works, and we don't
850# need no steenking BIOS anyway (except for the initial loading :-).
851# The BIOS-routine wants lots of unnecessary data, and it's less
852# "interesting" anyway. This is how REAL programmers do it.
853#
854# Well, now's the time to actually move into protected mode. To make
855# things as simple as possible, we do no register set-up or anything,
856# we let the gnu-compiled 32-bit programs do that. We just jump to
857# absolute address 0x1000 (or the loader supplied one),
858# in 32-bit protected mode.
859#
860# Note that the short jump isn't strictly needed, although there are
861# reasons why it might be a good idea. It won't hurt in any case.
862 movw $1, %ax # protected mode (PE) bit
863 lmsw %ax # This is it!
864 jmp flush_instr
865
866flush_instr:
867 xorw %bx, %bx # Flag to indicate a boot
868 xorl %esi, %esi # Pointer to real-mode code
869 movw %cs, %si
870 subw $DELTA_INITSEG, %si
871 shll $4, %esi # Convert to 32-bit pointer
872
873# jump to startup_32 in arch/i386/boot/compressed/head.S
874#
875# NOTE: For high loaded big kernels we need a
876# jmpi 0x100000,__BOOT_CS
877#
878# but we yet haven't reloaded the CS register, so the default size
879# of the target offset still is 16 bit.
880# However, using an operand prefix (0x66), the CPU will properly
881# take our 48 bit far pointer. (INTeL 80386 Programmer's Reference
882# Manual, Mixing 16-bit and 32-bit code, page 16-6)
883
884 .byte 0x66, 0xea # prefix + jmpi-opcode
885code32: .long startup_32 # will be set to %cs+startup_32
886 .word __BOOT_CS
887.code32
888startup_32:
889 movl $(__BOOT_DS), %eax
890 movl %eax, %ds
891 movl %eax, %es
892 movl %eax, %fs
893 movl %eax, %gs
894 movl %eax, %ss
895
896 xorl %eax, %eax
8971: incl %eax # check that A20 really IS enabled
898 movl %eax, 0x00000000 # loop forever if it isn't
899 cmpl %eax, 0x00100000
900 je 1b
901
902 # Jump to the 32bit entry point
903 jmpl *(code32_start - start + (DELTA_INITSEG << 4))(%esi)
904.code16
905
906# Here's a bunch of information about your current kernel..
907kernel_version: .ascii UTS_RELEASE
908 .ascii " ("
909 .ascii LINUX_COMPILE_BY
910 .ascii "@"
911 .ascii LINUX_COMPILE_HOST
912 .ascii ") "
913 .ascii UTS_VERSION
914 .byte 0
915
916# This is the default real mode switch routine.
917# to be called just before protected mode transition
918default_switch:
919 cli # no interrupts allowed !
920 movb $0x80, %al # disable NMI for bootup
921 # sequence
922 outb %al, $0x70
923 lret
924
925
926#ifndef CONFIG_X86_VOYAGER
927# This routine tests whether or not A20 is enabled. If so, it
928# exits with zf = 0.
929#
930# The memory address used, 0x200, is the int $0x80 vector, which
931# should be safe.
932
933A20_TEST_ADDR = 4*0x80
934
935a20_test:
936 pushw %cx
937 pushw %ax
938 xorw %cx, %cx
939 movw %cx, %fs # Low memory
940 decw %cx
941 movw %cx, %gs # High memory area
942 movw $A20_TEST_LOOPS, %cx
943 movw %fs:(A20_TEST_ADDR), %ax
944 pushw %ax
945a20_test_wait:
946 incw %ax
947 movw %ax, %fs:(A20_TEST_ADDR)
948 call delay # Serialize and make delay constant
949 cmpw %gs:(A20_TEST_ADDR+0x10), %ax
950 loope a20_test_wait
951
952 popw %fs:(A20_TEST_ADDR)
953 popw %ax
954 popw %cx
955 ret
956
957#endif /* CONFIG_X86_VOYAGER */
958
959# This routine checks that the keyboard command queue is empty
960# (after emptying the output buffers)
961#
962# Some machines have delusions that the keyboard buffer is always full
963# with no keyboard attached...
964#
965# If there is no keyboard controller, we will usually get 0xff
966# to all the reads. With each IO taking a microsecond and
967# a timeout of 100,000 iterations, this can take about half a
968# second ("delay" == outb to port 0x80). That should be ok,
969# and should also be plenty of time for a real keyboard controller
970# to empty.
971#
972
973empty_8042:
974 pushl %ecx
975 movl $100000, %ecx
976
977empty_8042_loop:
978 decl %ecx
979 jz empty_8042_end_loop
980
981 call delay
982
983 inb $0x64, %al # 8042 status port
984 testb $1, %al # output buffer?
985 jz no_output
986
987 call delay
988 inb $0x60, %al # read it
989 jmp empty_8042_loop
990
991no_output:
992 testb $2, %al # is input buffer full?
993 jnz empty_8042_loop # yes - loop
994empty_8042_end_loop:
995 popl %ecx
996 ret
997
998# Read the cmos clock. Return the seconds in al
999gettime:
1000 pushw %cx
1001 movb $0x02, %ah
1002 int $0x1a
1003 movb %dh, %al # %dh contains the seconds
1004 andb $0x0f, %al
1005 movb %dh, %ah
1006 movb $0x04, %cl
1007 shrb %cl, %ah
1008 aad
1009 popw %cx
1010 ret
1011
1012# Delay is needed after doing I/O
1013delay:
1014 outb %al,$0x80
1015 ret
1016
1017# Descriptor tables
1018#
1019# NOTE: The intel manual says gdt should be sixteen bytes aligned for
1020# efficiency reasons. However, there are machines which are known not
1021# to boot with misaligned GDTs, so alter this at your peril! If you alter
1022# GDT_ENTRY_BOOT_CS (in asm/segment.h) remember to leave at least two
1023# empty GDT entries (one for NULL and one reserved).
1024#
1025# NOTE: On some CPUs, the GDT must be 8 byte aligned. This is
1026# true for the Voyager Quad CPU card which will not boot without
1027# This directive. 16 byte aligment is recommended by intel.
1028#
1029 .align 16
1030gdt:
1031 .fill GDT_ENTRY_BOOT_CS,8,0
1032
1033 .word 0xFFFF # 4Gb - (0x100000*0x1000 = 4Gb)
1034 .word 0 # base address = 0
1035 .word 0x9A00 # code read/exec
1036 .word 0x00CF # granularity = 4096, 386
1037 # (+5th nibble of limit)
1038
1039 .word 0xFFFF # 4Gb - (0x100000*0x1000 = 4Gb)
1040 .word 0 # base address = 0
1041 .word 0x9200 # data read/write
1042 .word 0x00CF # granularity = 4096, 386
1043 # (+5th nibble of limit)
1044gdt_end:
1045 .align 4
1046
1047 .word 0 # alignment byte
1048idt_48:
1049 .word 0 # idt limit = 0
1050 .word 0, 0 # idt base = 0L
1051
1052 .word 0 # alignment byte
1053gdt_48:
1054 .word gdt_end - gdt - 1 # gdt limit
1055 .word 0, 0 # gdt base (filled in later)
1056
1057# Include video setup & detection code
1058
1059#include "video.S"
1060
1061# Setup signature -- must be last
1062setup_sig1: .word SIG1
1063setup_sig2: .word SIG2
1064
1065# After this point, there is some free space which is used by the video mode
1066# handling code to store the temporary mode table (not used by the kernel).
1067
1068modelist:
1069
1070.text
1071endtext:
1072.data
1073enddata:
1074.bss
1075endbss:
diff --git a/arch/i386/boot/video.S b/arch/i386/boot/video.S
deleted file mode 100644
index 8143c9516cb4..000000000000
--- a/arch/i386/boot/video.S
+++ /dev/null
@@ -1,2043 +0,0 @@
1/* video.S
2 *
3 * Display adapter & video mode setup, version 2.13 (14-May-99)
4 *
5 * Copyright (C) 1995 -- 1998 Martin Mares <mj@ucw.cz>
6 * Based on the original setup.S code (C) Linus Torvalds and Mats Anderson
7 *
8 * Rewritten to use GNU 'as' by Chris Noe <stiker@northlink.com> May 1999
9 *
10 * For further information, look at Documentation/svga.txt.
11 *
12 */
13
14/* Enable autodetection of SVGA adapters and modes. */
15#undef CONFIG_VIDEO_SVGA
16
17/* Enable autodetection of VESA modes */
18#define CONFIG_VIDEO_VESA
19
20/* Enable compacting of mode table */
21#define CONFIG_VIDEO_COMPACT
22
23/* Retain screen contents when switching modes */
24#define CONFIG_VIDEO_RETAIN
25
26/* Enable local mode list */
27#undef CONFIG_VIDEO_LOCAL
28
29/* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */
30#undef CONFIG_VIDEO_400_HACK
31
32/* Hack that lets you force specific BIOS mode ID and specific dimensions */
33#undef CONFIG_VIDEO_GFX_HACK
34#define VIDEO_GFX_BIOS_AX 0x4f02 /* 800x600 on ThinkPad */
35#define VIDEO_GFX_BIOS_BX 0x0102
36#define VIDEO_GFX_DUMMY_RESOLUTION 0x6425 /* 100x37 */
37
38/* This code uses an extended set of video mode numbers. These include:
39 * Aliases for standard modes
40 * NORMAL_VGA (-1)
41 * EXTENDED_VGA (-2)
42 * ASK_VGA (-3)
43 * Video modes numbered by menu position -- NOT RECOMMENDED because of lack
44 * of compatibility when extending the table. These are between 0x00 and 0xff.
45 */
46#define VIDEO_FIRST_MENU 0x0000
47
48/* Standard BIOS video modes (BIOS number + 0x0100) */
49#define VIDEO_FIRST_BIOS 0x0100
50
51/* VESA BIOS video modes (VESA number + 0x0200) */
52#define VIDEO_FIRST_VESA 0x0200
53
54/* Video7 special modes (BIOS number + 0x0900) */
55#define VIDEO_FIRST_V7 0x0900
56
57/* Special video modes */
58#define VIDEO_FIRST_SPECIAL 0x0f00
59#define VIDEO_80x25 0x0f00
60#define VIDEO_8POINT 0x0f01
61#define VIDEO_80x43 0x0f02
62#define VIDEO_80x28 0x0f03
63#define VIDEO_CURRENT_MODE 0x0f04
64#define VIDEO_80x30 0x0f05
65#define VIDEO_80x34 0x0f06
66#define VIDEO_80x60 0x0f07
67#define VIDEO_GFX_HACK 0x0f08
68#define VIDEO_LAST_SPECIAL 0x0f09
69
70/* Video modes given by resolution */
71#define VIDEO_FIRST_RESOLUTION 0x1000
72
73/* The "recalculate timings" flag */
74#define VIDEO_RECALC 0x8000
75
76/* Positions of various video parameters passed to the kernel */
77/* (see also include/linux/tty.h) */
78#define PARAM_CURSOR_POS 0x00
79#define PARAM_VIDEO_PAGE 0x04
80#define PARAM_VIDEO_MODE 0x06
81#define PARAM_VIDEO_COLS 0x07
82#define PARAM_VIDEO_EGA_BX 0x0a
83#define PARAM_VIDEO_LINES 0x0e
84#define PARAM_HAVE_VGA 0x0f
85#define PARAM_FONT_POINTS 0x10
86
87#define PARAM_LFB_WIDTH 0x12
88#define PARAM_LFB_HEIGHT 0x14
89#define PARAM_LFB_DEPTH 0x16
90#define PARAM_LFB_BASE 0x18
91#define PARAM_LFB_SIZE 0x1c
92#define PARAM_LFB_LINELENGTH 0x24
93#define PARAM_LFB_COLORS 0x26
94#define PARAM_VESAPM_SEG 0x2e
95#define PARAM_VESAPM_OFF 0x30
96#define PARAM_LFB_PAGES 0x32
97#define PARAM_VESA_ATTRIB 0x34
98#define PARAM_CAPABILITIES 0x36
99
100/* Define DO_STORE according to CONFIG_VIDEO_RETAIN */
101#ifdef CONFIG_VIDEO_RETAIN
102#define DO_STORE call store_screen
103#else
104#define DO_STORE
105#endif /* CONFIG_VIDEO_RETAIN */
106
107# This is the main entry point called by setup.S
108# %ds *must* be pointing to the bootsector
109video: pushw %ds # We use different segments
110 pushw %ds # FS contains original DS
111 popw %fs
112 pushw %cs # DS is equal to CS
113 popw %ds
114 pushw %cs # ES is equal to CS
115 popw %es
116 xorw %ax, %ax
117 movw %ax, %gs # GS is zero
118 cld
119 call basic_detect # Basic adapter type testing (EGA/VGA/MDA/CGA)
120#ifdef CONFIG_VIDEO_SELECT
121 movw %fs:(0x01fa), %ax # User selected video mode
122 cmpw $ASK_VGA, %ax # Bring up the menu
123 jz vid2
124
125 call mode_set # Set the mode
126 jc vid1
127
128 leaw badmdt, %si # Invalid mode ID
129 call prtstr
130vid2: call mode_menu
131vid1:
132#ifdef CONFIG_VIDEO_RETAIN
133 call restore_screen # Restore screen contents
134#endif /* CONFIG_VIDEO_RETAIN */
135 call store_edid
136#endif /* CONFIG_VIDEO_SELECT */
137 call mode_params # Store mode parameters
138 popw %ds # Restore original DS
139 ret
140
141# Detect if we have CGA, MDA, EGA or VGA and pass it to the kernel.
142basic_detect:
143 movb $0, %fs:(PARAM_HAVE_VGA)
144 movb $0x12, %ah # Check EGA/VGA
145 movb $0x10, %bl
146 int $0x10
147 movw %bx, %fs:(PARAM_VIDEO_EGA_BX) # Identifies EGA to the kernel
148 cmpb $0x10, %bl # No, it's a CGA/MDA/HGA card.
149 je basret
150
151 incb adapter
152 movw $0x1a00, %ax # Check EGA or VGA?
153 int $0x10
154 cmpb $0x1a, %al # 1a means VGA...
155 jne basret # anything else is EGA.
156
157 incb %fs:(PARAM_HAVE_VGA) # We've detected a VGA
158 incb adapter
159basret: ret
160
161# Store the video mode parameters for later usage by the kernel.
162# This is done by asking the BIOS except for the rows/columns
163# parameters in the default 80x25 mode -- these are set directly,
164# because some very obscure BIOSes supply insane values.
165mode_params:
166#ifdef CONFIG_VIDEO_SELECT
167 cmpb $0, graphic_mode
168 jnz mopar_gr
169#endif
170 movb $0x03, %ah # Read cursor position
171 xorb %bh, %bh
172 int $0x10
173 movw %dx, %fs:(PARAM_CURSOR_POS)
174 movb $0x0f, %ah # Read page/mode/width
175 int $0x10
176 movw %bx, %fs:(PARAM_VIDEO_PAGE)
177 movw %ax, %fs:(PARAM_VIDEO_MODE) # Video mode and screen width
178 cmpb $0x7, %al # MDA/HGA => segment differs
179 jnz mopar0
180
181 movw $0xb000, video_segment
182mopar0: movw %gs:(0x485), %ax # Font size
183 movw %ax, %fs:(PARAM_FONT_POINTS) # (valid only on EGA/VGA)
184 movw force_size, %ax # Forced size?
185 orw %ax, %ax
186 jz mopar1
187
188 movb %ah, %fs:(PARAM_VIDEO_COLS)
189 movb %al, %fs:(PARAM_VIDEO_LINES)
190 ret
191
192mopar1: movb $25, %al
193 cmpb $0, adapter # If we are on CGA/MDA/HGA, the
194 jz mopar2 # screen must have 25 lines.
195
196 movb %gs:(0x484), %al # On EGA/VGA, use the EGA+ BIOS
197 incb %al # location of max lines.
198mopar2: movb %al, %fs:(PARAM_VIDEO_LINES)
199 ret
200
201#ifdef CONFIG_VIDEO_SELECT
202# Fetching of VESA frame buffer parameters
203mopar_gr:
204 leaw modelist+1024, %di
205 movb $0x23, %fs:(PARAM_HAVE_VGA)
206 movw 16(%di), %ax
207 movw %ax, %fs:(PARAM_LFB_LINELENGTH)
208 movw 18(%di), %ax
209 movw %ax, %fs:(PARAM_LFB_WIDTH)
210 movw 20(%di), %ax
211 movw %ax, %fs:(PARAM_LFB_HEIGHT)
212 movb 25(%di), %al
213 movb $0, %ah
214 movw %ax, %fs:(PARAM_LFB_DEPTH)
215 movb 29(%di), %al
216 movb $0, %ah
217 movw %ax, %fs:(PARAM_LFB_PAGES)
218 movl 40(%di), %eax
219 movl %eax, %fs:(PARAM_LFB_BASE)
220 movl 31(%di), %eax
221 movl %eax, %fs:(PARAM_LFB_COLORS)
222 movl 35(%di), %eax
223 movl %eax, %fs:(PARAM_LFB_COLORS+4)
224 movw 0(%di), %ax
225 movw %ax, %fs:(PARAM_VESA_ATTRIB)
226
227# get video mem size
228 leaw modelist+1024, %di
229 movw $0x4f00, %ax
230 int $0x10
231 xorl %eax, %eax
232 movw 18(%di), %ax
233 movl %eax, %fs:(PARAM_LFB_SIZE)
234
235# store mode capabilities
236 movl 10(%di), %eax
237 movl %eax, %fs:(PARAM_CAPABILITIES)
238
239# switching the DAC to 8-bit is for <= 8 bpp only
240 movw %fs:(PARAM_LFB_DEPTH), %ax
241 cmpw $8, %ax
242 jg dac_done
243
244# get DAC switching capability
245 xorl %eax, %eax
246 movb 10(%di), %al
247 testb $1, %al
248 jz dac_set
249
250# attempt to switch DAC to 8-bit
251 movw $0x4f08, %ax
252 movw $0x0800, %bx
253 int $0x10
254 cmpw $0x004f, %ax
255 jne dac_set
256 movb %bh, dac_size # store actual DAC size
257
258dac_set:
259# set color size to DAC size
260 movb dac_size, %al
261 movb %al, %fs:(PARAM_LFB_COLORS+0)
262 movb %al, %fs:(PARAM_LFB_COLORS+2)
263 movb %al, %fs:(PARAM_LFB_COLORS+4)
264 movb %al, %fs:(PARAM_LFB_COLORS+6)
265
266# set color offsets to 0
267 movb $0, %fs:(PARAM_LFB_COLORS+1)
268 movb $0, %fs:(PARAM_LFB_COLORS+3)
269 movb $0, %fs:(PARAM_LFB_COLORS+5)
270 movb $0, %fs:(PARAM_LFB_COLORS+7)
271
272dac_done:
273# get protected mode interface informations
274 movw $0x4f0a, %ax
275 xorw %bx, %bx
276 xorw %di, %di
277 int $0x10
278 cmp $0x004f, %ax
279 jnz no_pm
280
281 movw %es, %fs:(PARAM_VESAPM_SEG)
282 movw %di, %fs:(PARAM_VESAPM_OFF)
283no_pm: ret
284
285# The video mode menu
286mode_menu:
287 leaw keymsg, %si # "Return/Space/Timeout" message
288 call prtstr
289 call flush
290nokey: call getkt
291
292 cmpb $0x0d, %al # ENTER ?
293 je listm # yes - manual mode selection
294
295 cmpb $0x20, %al # SPACE ?
296 je defmd1 # no - repeat
297
298 call beep
299 jmp nokey
300
301defmd1: ret # No mode chosen? Default 80x25
302
303listm: call mode_table # List mode table
304listm0: leaw name_bann, %si # Print adapter name
305 call prtstr
306 movw card_name, %si
307 orw %si, %si
308 jnz an2
309
310 movb adapter, %al
311 leaw old_name, %si
312 orb %al, %al
313 jz an1
314
315 leaw ega_name, %si
316 decb %al
317 jz an1
318
319 leaw vga_name, %si
320 jmp an1
321
322an2: call prtstr
323 leaw svga_name, %si
324an1: call prtstr
325 leaw listhdr, %si # Table header
326 call prtstr
327 movb $0x30, %dl # DL holds mode number
328 leaw modelist, %si
329lm1: cmpw $ASK_VGA, (%si) # End?
330 jz lm2
331
332 movb %dl, %al # Menu selection number
333 call prtchr
334 call prtsp2
335 lodsw
336 call prthw # Mode ID
337 call prtsp2
338 movb 0x1(%si), %al
339 call prtdec # Rows
340 movb $0x78, %al # the letter 'x'
341 call prtchr
342 lodsw
343 call prtdec # Columns
344 movb $0x0d, %al # New line
345 call prtchr
346 movb $0x0a, %al
347 call prtchr
348 incb %dl # Next character
349 cmpb $0x3a, %dl
350 jnz lm1
351
352 movb $0x61, %dl
353 jmp lm1
354
355lm2: leaw prompt, %si # Mode prompt
356 call prtstr
357 leaw edit_buf, %di # Editor buffer
358lm3: call getkey
359 cmpb $0x0d, %al # Enter?
360 jz lment
361
362 cmpb $0x08, %al # Backspace?
363 jz lmbs
364
365 cmpb $0x20, %al # Printable?
366 jc lm3
367
368 cmpw $edit_buf+4, %di # Enough space?
369 jz lm3
370
371 stosb
372 call prtchr
373 jmp lm3
374
375lmbs: cmpw $edit_buf, %di # Backspace
376 jz lm3
377
378 decw %di
379 movb $0x08, %al
380 call prtchr
381 call prtspc
382 movb $0x08, %al
383 call prtchr
384 jmp lm3
385
386lment: movb $0, (%di)
387 leaw crlft, %si
388 call prtstr
389 leaw edit_buf, %si
390 cmpb $0, (%si) # Empty string = default mode
391 jz lmdef
392
393 cmpb $0, 1(%si) # One character = menu selection
394 jz mnusel
395
396 cmpw $0x6373, (%si) # "scan" => mode scanning
397 jnz lmhx
398
399 cmpw $0x6e61, 2(%si)
400 jz lmscan
401
402lmhx: xorw %bx, %bx # Else => mode ID in hex
403lmhex: lodsb
404 orb %al, %al
405 jz lmuse1
406
407 subb $0x30, %al
408 jc lmbad
409
410 cmpb $10, %al
411 jc lmhx1
412
413 subb $7, %al
414 andb $0xdf, %al
415 cmpb $10, %al
416 jc lmbad
417
418 cmpb $16, %al
419 jnc lmbad
420
421lmhx1: shlw $4, %bx
422 orb %al, %bl
423 jmp lmhex
424
425lmuse1: movw %bx, %ax
426 jmp lmuse
427
428mnusel: lodsb # Menu selection
429 xorb %ah, %ah
430 subb $0x30, %al
431 jc lmbad
432
433 cmpb $10, %al
434 jc lmuse
435
436 cmpb $0x61-0x30, %al
437 jc lmbad
438
439 subb $0x61-0x30-10, %al
440 cmpb $36, %al
441 jnc lmbad
442
443lmuse: call mode_set
444 jc lmdef
445
446lmbad: leaw unknt, %si
447 call prtstr
448 jmp lm2
449lmscan: cmpb $0, adapter # Scanning only on EGA/VGA
450 jz lmbad
451
452 movw $0, mt_end # Scanning of modes is
453 movb $1, scanning # done as new autodetection.
454 call mode_table
455 jmp listm0
456lmdef: ret
457
458# Additional parts of mode_set... (relative jumps, you know)
459setv7: # Video7 extended modes
460 DO_STORE
461 subb $VIDEO_FIRST_V7>>8, %bh
462 movw $0x6f05, %ax
463 int $0x10
464 stc
465 ret
466
467_setrec: jmp setrec # Ugly...
468_set_80x25: jmp set_80x25
469
470# Aliases for backward compatibility.
471setalias:
472 movw $VIDEO_80x25, %ax
473 incw %bx
474 jz mode_set
475
476 movb $VIDEO_8POINT-VIDEO_FIRST_SPECIAL, %al
477 incw %bx
478 jnz setbad # Fall-through!
479
480# Setting of user mode (AX=mode ID) => CF=success
481mode_set:
482 movw %ax, %fs:(0x01fa) # Store mode for use in acpi_wakeup.S
483 movw %ax, %bx
484 cmpb $0xff, %ah
485 jz setalias
486
487 testb $VIDEO_RECALC>>8, %ah
488 jnz _setrec
489
490 cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah
491 jnc setres
492
493 cmpb $VIDEO_FIRST_SPECIAL>>8, %ah
494 jz setspc
495
496 cmpb $VIDEO_FIRST_V7>>8, %ah
497 jz setv7
498
499 cmpb $VIDEO_FIRST_VESA>>8, %ah
500 jnc check_vesa
501
502 orb %ah, %ah
503 jz setmenu
504
505 decb %ah
506 jz setbios
507
508setbad: clc
509 movb $0, do_restore # The screen needn't be restored
510 ret
511
512setvesa:
513 DO_STORE
514 subb $VIDEO_FIRST_VESA>>8, %bh
515 movw $0x4f02, %ax # VESA BIOS mode set call
516 int $0x10
517 cmpw $0x004f, %ax # AL=4f if implemented
518 jnz setbad # AH=0 if OK
519
520 stc
521 ret
522
523setbios:
524 DO_STORE
525 int $0x10 # Standard BIOS mode set call
526 pushw %bx
527 movb $0x0f, %ah # Check if really set
528 int $0x10
529 popw %bx
530 cmpb %bl, %al
531 jnz setbad
532
533 stc
534 ret
535
536setspc: xorb %bh, %bh # Set special mode
537 cmpb $VIDEO_LAST_SPECIAL-VIDEO_FIRST_SPECIAL, %bl
538 jnc setbad
539
540 addw %bx, %bx
541 jmp *spec_inits(%bx)
542
543setmenu:
544 orb %al, %al # 80x25 is an exception
545 jz _set_80x25
546
547 pushw %bx # Set mode chosen from menu
548 call mode_table # Build the mode table
549 popw %ax
550 shlw $2, %ax
551 addw %ax, %si
552 cmpw %di, %si
553 jnc setbad
554
555 movw (%si), %ax # Fetch mode ID
556_m_s: jmp mode_set
557
558setres: pushw %bx # Set mode chosen by resolution
559 call mode_table
560 popw %bx
561 xchgb %bl, %bh
562setr1: lodsw
563 cmpw $ASK_VGA, %ax # End of the list?
564 jz setbad
565
566 lodsw
567 cmpw %bx, %ax
568 jnz setr1
569
570 movw -4(%si), %ax # Fetch mode ID
571 jmp _m_s
572
573check_vesa:
574#ifdef CONFIG_FIRMWARE_EDID
575 leaw modelist+1024, %di
576 movw $0x4f00, %ax
577 int $0x10
578 cmpw $0x004f, %ax
579 jnz setbad
580
581 movw 4(%di), %ax
582 movw %ax, vbe_version
583#endif
584 leaw modelist+1024, %di
585 subb $VIDEO_FIRST_VESA>>8, %bh
586 movw %bx, %cx # Get mode information structure
587 movw $0x4f01, %ax
588 int $0x10
589 addb $VIDEO_FIRST_VESA>>8, %bh
590 cmpw $0x004f, %ax
591 jnz setbad
592
593 movb (%di), %al # Check capabilities.
594 andb $0x19, %al
595 cmpb $0x09, %al
596 jz setvesa # This is a text mode
597
598 movb (%di), %al # Check capabilities.
599 andb $0x99, %al
600 cmpb $0x99, %al
601 jnz _setbad # Doh! No linear frame buffer.
602
603 subb $VIDEO_FIRST_VESA>>8, %bh
604 orw $0x4000, %bx # Use linear frame buffer
605 movw $0x4f02, %ax # VESA BIOS mode set call
606 int $0x10
607 cmpw $0x004f, %ax # AL=4f if implemented
608 jnz _setbad # AH=0 if OK
609
610 movb $1, graphic_mode # flag graphic mode
611 movb $0, do_restore # no screen restore
612 stc
613 ret
614
615_setbad: jmp setbad # Ugly...
616
617# Recalculate vertical display end registers -- this fixes various
618# inconsistencies of extended modes on many adapters. Called when
619# the VIDEO_RECALC flag is set in the mode ID.
620
621setrec: subb $VIDEO_RECALC>>8, %ah # Set the base mode
622 call mode_set
623 jnc rct3
624
625 movw %gs:(0x485), %ax # Font size in pixels
626 movb %gs:(0x484), %bl # Number of rows
627 incb %bl
628 mulb %bl # Number of visible
629 decw %ax # scan lines - 1
630 movw $0x3d4, %dx
631 movw %ax, %bx
632 movb $0x12, %al # Lower 8 bits
633 movb %bl, %ah
634 outw %ax, %dx
635 movb $0x07, %al # Bits 8 and 9 in the overflow register
636 call inidx
637 xchgb %al, %ah
638 andb $0xbd, %ah
639 shrb %bh
640 jnc rct1
641 orb $0x02, %ah
642rct1: shrb %bh
643 jnc rct2
644 orb $0x40, %ah
645rct2: movb $0x07, %al
646 outw %ax, %dx
647 stc
648rct3: ret
649
650# Table of routines for setting of the special modes.
651spec_inits:
652 .word set_80x25
653 .word set_8pixel
654 .word set_80x43
655 .word set_80x28
656 .word set_current
657 .word set_80x30
658 .word set_80x34
659 .word set_80x60
660 .word set_gfx
661
662# Set the 80x25 mode. If already set, do nothing.
663set_80x25:
664 movw $0x5019, force_size # Override possibly broken BIOS
665use_80x25:
666#ifdef CONFIG_VIDEO_400_HACK
667 movw $0x1202, %ax # Force 400 scan lines
668 movb $0x30, %bl
669 int $0x10
670#else
671 movb $0x0f, %ah # Get current mode ID
672 int $0x10
673 cmpw $0x5007, %ax # Mode 7 (80x25 mono) is the only one available
674 jz st80 # on CGA/MDA/HGA and is also available on EGAM
675
676 cmpw $0x5003, %ax # Unknown mode, force 80x25 color
677 jnz force3
678
679st80: cmpb $0, adapter # CGA/MDA/HGA => mode 3/7 is always 80x25
680 jz set80
681
682 movb %gs:(0x0484), %al # This is EGA+ -- beware of 80x50 etc.
683 orb %al, %al # Some buggy BIOS'es set 0 rows
684 jz set80
685
686 cmpb $24, %al # It's hopefully correct
687 jz set80
688#endif /* CONFIG_VIDEO_400_HACK */
689force3: DO_STORE
690 movw $0x0003, %ax # Forced set
691 int $0x10
692set80: stc
693 ret
694
695# Set the 80x50/80x43 8-pixel mode. Simple BIOS calls.
696set_8pixel:
697 DO_STORE
698 call use_80x25 # The base is 80x25
699set_8pt:
700 movw $0x1112, %ax # Use 8x8 font
701 xorb %bl, %bl
702 int $0x10
703 movw $0x1200, %ax # Use alternate print screen
704 movb $0x20, %bl
705 int $0x10
706 movw $0x1201, %ax # Turn off cursor emulation
707 movb $0x34, %bl
708 int $0x10
709 movb $0x01, %ah # Define cursor scan lines 6-7
710 movw $0x0607, %cx
711 int $0x10
712set_current:
713 stc
714 ret
715
716# Set the 80x28 mode. This mode works on all VGA's, because it's a standard
717# 80x25 mode with 14-point fonts instead of 16-point.
718set_80x28:
719 DO_STORE
720 call use_80x25 # The base is 80x25
721set14: movw $0x1111, %ax # Use 9x14 font
722 xorb %bl, %bl
723 int $0x10
724 movb $0x01, %ah # Define cursor scan lines 11-12
725 movw $0x0b0c, %cx
726 int $0x10
727 stc
728 ret
729
730# Set the 80x43 mode. This mode is works on all VGA's.
731# It's a 350-scanline mode with 8-pixel font.
732set_80x43:
733 DO_STORE
734 movw $0x1201, %ax # Set 350 scans
735 movb $0x30, %bl
736 int $0x10
737 movw $0x0003, %ax # Reset video mode
738 int $0x10
739 jmp set_8pt # Use 8-pixel font
740
741# Set the 80x30 mode (all VGA's). 480 scanlines, 16-pixel font.
742set_80x30:
743 call use_80x25 # Start with real 80x25
744 DO_STORE
745 movw $0x3cc, %dx # Get CRTC port
746 inb %dx, %al
747 movb $0xd4, %dl
748 rorb %al # Mono or color?
749 jc set48a
750
751 movb $0xb4, %dl
752set48a: movw $0x0c11, %ax # Vertical sync end (also unlocks CR0-7)
753 call outidx
754 movw $0x0b06, %ax # Vertical total
755 call outidx
756 movw $0x3e07, %ax # (Vertical) overflow
757 call outidx
758 movw $0xea10, %ax # Vertical sync start
759 call outidx
760 movw $0xdf12, %ax # Vertical display end
761 call outidx
762 movw $0xe715, %ax # Vertical blank start
763 call outidx
764 movw $0x0416, %ax # Vertical blank end
765 call outidx
766 pushw %dx
767 movb $0xcc, %dl # Misc output register (read)
768 inb %dx, %al
769 movb $0xc2, %dl # (write)
770 andb $0x0d, %al # Preserve clock select bits and color bit
771 orb $0xe2, %al # Set correct sync polarity
772 outb %al, %dx
773 popw %dx
774 movw $0x501e, force_size
775 stc # That's all.
776 ret
777
778# Set the 80x34 mode (all VGA's). 480 scans, 14-pixel font.
779set_80x34:
780 call set_80x30 # Set 480 scans
781 call set14 # And 14-pt font
782 movw $0xdb12, %ax # VGA vertical display end
783 movw $0x5022, force_size
784setvde: call outidx
785 stc
786 ret
787
788# Set the 80x60 mode (all VGA's). 480 scans, 8-pixel font.
789set_80x60:
790 call set_80x30 # Set 480 scans
791 call set_8pt # And 8-pt font
792 movw $0xdf12, %ax # VGA vertical display end
793 movw $0x503c, force_size
794 jmp setvde
795
796# Special hack for ThinkPad graphics
797set_gfx:
798#ifdef CONFIG_VIDEO_GFX_HACK
799 movw $VIDEO_GFX_BIOS_AX, %ax
800 movw $VIDEO_GFX_BIOS_BX, %bx
801 int $0x10
802 movw $VIDEO_GFX_DUMMY_RESOLUTION, force_size
803 stc
804#endif
805 ret
806
807#ifdef CONFIG_VIDEO_RETAIN
808
809# Store screen contents to temporary buffer.
810store_screen:
811 cmpb $0, do_restore # Already stored?
812 jnz stsr
813
814 testb $CAN_USE_HEAP, loadflags # Have we space for storing?
815 jz stsr
816
817 pushw %ax
818 pushw %bx
819 pushw force_size # Don't force specific size
820 movw $0, force_size
821 call mode_params # Obtain params of current mode
822 popw force_size
823 movb %fs:(PARAM_VIDEO_LINES), %ah
824 movb %fs:(PARAM_VIDEO_COLS), %al
825 movw %ax, %bx # BX=dimensions
826 mulb %ah
827 movw %ax, %cx # CX=number of characters
828 addw %ax, %ax # Calculate image size
829 addw $modelist+1024+4, %ax
830 cmpw heap_end_ptr, %ax
831 jnc sts1 # Unfortunately, out of memory
832
833 movw %fs:(PARAM_CURSOR_POS), %ax # Store mode params
834 leaw modelist+1024, %di
835 stosw
836 movw %bx, %ax
837 stosw
838 pushw %ds # Store the screen
839 movw video_segment, %ds
840 xorw %si, %si
841 rep
842 movsw
843 popw %ds
844 incb do_restore # Screen will be restored later
845sts1: popw %bx
846 popw %ax
847stsr: ret
848
849# Restore screen contents from temporary buffer.
850restore_screen:
851 cmpb $0, do_restore # Has the screen been stored?
852 jz res1
853
854 call mode_params # Get parameters of current mode
855 movb %fs:(PARAM_VIDEO_LINES), %cl
856 movb %fs:(PARAM_VIDEO_COLS), %ch
857 leaw modelist+1024, %si # Screen buffer
858 lodsw # Set cursor position
859 movw %ax, %dx
860 cmpb %cl, %dh
861 jc res2
862
863 movb %cl, %dh
864 decb %dh
865res2: cmpb %ch, %dl
866 jc res3
867
868 movb %ch, %dl
869 decb %dl
870res3: movb $0x02, %ah
871 movb $0x00, %bh
872 int $0x10
873 lodsw # Display size
874 movb %ah, %dl # DL=number of lines
875 movb $0, %ah # BX=phys. length of orig. line
876 movw %ax, %bx
877 cmpb %cl, %dl # Too many?
878 jc res4
879
880 pushw %ax
881 movb %dl, %al
882 subb %cl, %al
883 mulb %bl
884 addw %ax, %si
885 addw %ax, %si
886 popw %ax
887 movb %cl, %dl
888res4: cmpb %ch, %al # Too wide?
889 jc res5
890
891 movb %ch, %al # AX=width of src. line
892res5: movb $0, %cl
893 xchgb %ch, %cl
894 movw %cx, %bp # BP=width of dest. line
895 pushw %es
896 movw video_segment, %es
897 xorw %di, %di # Move the data
898 addw %bx, %bx # Convert BX and BP to _bytes_
899 addw %bp, %bp
900res6: pushw %si
901 pushw %di
902 movw %ax, %cx
903 rep
904 movsw
905 popw %di
906 popw %si
907 addw %bp, %di
908 addw %bx, %si
909 decb %dl
910 jnz res6
911
912 popw %es # Done
913res1: ret
914#endif /* CONFIG_VIDEO_RETAIN */
915
916# Write to indexed VGA register (AL=index, AH=data, DX=index reg. port)
917outidx: outb %al, %dx
918 pushw %ax
919 movb %ah, %al
920 incw %dx
921 outb %al, %dx
922 decw %dx
923 popw %ax
924 ret
925
926# Build the table of video modes (stored after the setup.S code at the
927# `modelist' label. Each video mode record looks like:
928# .word MODE-ID (our special mode ID (see above))
929# .byte rows (number of rows)
930# .byte columns (number of columns)
931# Returns address of the end of the table in DI, the end is marked
932# with a ASK_VGA ID.
933mode_table:
934 movw mt_end, %di # Already filled?
935 orw %di, %di
936 jnz mtab1x
937
938 leaw modelist, %di # Store standard modes:
939 movl $VIDEO_80x25 + 0x50190000, %eax # The 80x25 mode (ALL)
940 stosl
941 movb adapter, %al # CGA/MDA/HGA -- no more modes
942 orb %al, %al
943 jz mtabe
944
945 decb %al
946 jnz mtabv
947
948 movl $VIDEO_8POINT + 0x502b0000, %eax # The 80x43 EGA mode
949 stosl
950 jmp mtabe
951
952mtab1x: jmp mtab1
953
954mtabv: leaw vga_modes, %si # All modes for std VGA
955 movw $vga_modes_end-vga_modes, %cx
956 rep # I'm unable to use movsw as I don't know how to store a half
957 movsb # of the expression above to cx without using explicit shr.
958
959 cmpb $0, scanning # Mode scan requested?
960 jz mscan1
961
962 call mode_scan
963mscan1:
964
965#ifdef CONFIG_VIDEO_LOCAL
966 call local_modes
967#endif /* CONFIG_VIDEO_LOCAL */
968
969#ifdef CONFIG_VIDEO_VESA
970 call vesa_modes # Detect VESA VGA modes
971#endif /* CONFIG_VIDEO_VESA */
972
973#ifdef CONFIG_VIDEO_SVGA
974 cmpb $0, scanning # Bypass when scanning
975 jnz mscan2
976
977 call svga_modes # Detect SVGA cards & modes
978mscan2:
979#endif /* CONFIG_VIDEO_SVGA */
980
981mtabe:
982
983#ifdef CONFIG_VIDEO_COMPACT
984 leaw modelist, %si
985 movw %di, %dx
986 movw %si, %di
987cmt1: cmpw %dx, %si # Scan all modes
988 jz cmt2
989
990 leaw modelist, %bx # Find in previous entries
991 movw 2(%si), %cx
992cmt3: cmpw %bx, %si
993 jz cmt4
994
995 cmpw 2(%bx), %cx # Found => don't copy this entry
996 jz cmt5
997
998 addw $4, %bx
999 jmp cmt3
1000
1001cmt4: movsl # Copy entry
1002 jmp cmt1
1003
1004cmt5: addw $4, %si # Skip entry
1005 jmp cmt1
1006
1007cmt2:
1008#endif /* CONFIG_VIDEO_COMPACT */
1009
1010 movw $ASK_VGA, (%di) # End marker
1011 movw %di, mt_end
1012mtab1: leaw modelist, %si # SI=mode list, DI=list end
1013ret0: ret
1014
1015# Modes usable on all standard VGAs
1016vga_modes:
1017 .word VIDEO_8POINT
1018 .word 0x5032 # 80x50
1019 .word VIDEO_80x43
1020 .word 0x502b # 80x43
1021 .word VIDEO_80x28
1022 .word 0x501c # 80x28
1023 .word VIDEO_80x30
1024 .word 0x501e # 80x30
1025 .word VIDEO_80x34
1026 .word 0x5022 # 80x34
1027 .word VIDEO_80x60
1028 .word 0x503c # 80x60
1029#ifdef CONFIG_VIDEO_GFX_HACK
1030 .word VIDEO_GFX_HACK
1031 .word VIDEO_GFX_DUMMY_RESOLUTION
1032#endif
1033
1034vga_modes_end:
1035# Detect VESA modes.
1036
1037#ifdef CONFIG_VIDEO_VESA
1038vesa_modes:
1039 cmpb $2, adapter # VGA only
1040 jnz ret0
1041
1042 movw %di, %bp # BP=original mode table end
1043 addw $0x200, %di # Buffer space
1044 movw $0x4f00, %ax # VESA Get card info call
1045 int $0x10
1046 movw %bp, %di
1047 cmpw $0x004f, %ax # Successful?
1048 jnz ret0
1049
1050 cmpw $0x4556, 0x200(%di)
1051 jnz ret0
1052
1053 cmpw $0x4153, 0x202(%di)
1054 jnz ret0
1055
1056 movw $vesa_name, card_name # Set name to "VESA VGA"
1057 pushw %gs
1058 lgsw 0x20e(%di), %si # GS:SI=mode list
1059 movw $128, %cx # Iteration limit
1060vesa1:
1061# gas version 2.9.1, using BFD version 2.9.1.0.23 buggers the next inst.
1062# XXX: lodsw %gs:(%si), %ax # Get next mode in the list
1063 gs; lodsw
1064 cmpw $0xffff, %ax # End of the table?
1065 jz vesar
1066
1067 cmpw $0x0080, %ax # Check validity of mode ID
1068 jc vesa2
1069
1070 orb %ah, %ah # Valid IDs: 0x0000-0x007f/0x0100-0x07ff
1071 jz vesan # Certain BIOSes report 0x80-0xff!
1072
1073 cmpw $0x0800, %ax
1074 jnc vesae
1075
1076vesa2: pushw %cx
1077 movw %ax, %cx # Get mode information structure
1078 movw $0x4f01, %ax
1079 int $0x10
1080 movw %cx, %bx # BX=mode number
1081 addb $VIDEO_FIRST_VESA>>8, %bh
1082 popw %cx
1083 cmpw $0x004f, %ax
1084 jnz vesan # Don't report errors (buggy BIOSES)
1085
1086 movb (%di), %al # Check capabilities. We require
1087 andb $0x19, %al # a color text mode.
1088 cmpb $0x09, %al
1089 jnz vesan
1090
1091 cmpw $0xb800, 8(%di) # Standard video memory address required
1092 jnz vesan
1093
1094 testb $2, (%di) # Mode characteristics supplied?
1095 movw %bx, (%di) # Store mode number
1096 jz vesa3
1097
1098 xorw %dx, %dx
1099 movw 0x12(%di), %bx # Width
1100 orb %bh, %bh
1101 jnz vesan
1102
1103 movb %bl, 0x3(%di)
1104 movw 0x14(%di), %ax # Height
1105 orb %ah, %ah
1106 jnz vesan
1107
1108 movb %al, 2(%di)
1109 mulb %bl
1110 cmpw $8193, %ax # Small enough for Linux console driver?
1111 jnc vesan
1112
1113 jmp vesaok
1114
1115vesa3: subw $0x8108, %bx # This mode has no detailed info specified,
1116 jc vesan # so it must be a standard VESA mode.
1117
1118 cmpw $5, %bx
1119 jnc vesan
1120
1121 movw vesa_text_mode_table(%bx), %ax
1122 movw %ax, 2(%di)
1123vesaok: addw $4, %di # The mode is valid. Store it.
1124vesan: loop vesa1 # Next mode. Limit exceeded => error
1125vesae: leaw vesaer, %si
1126 call prtstr
1127 movw %bp, %di # Discard already found modes.
1128vesar: popw %gs
1129 ret
1130
1131# Dimensions of standard VESA text modes
1132vesa_text_mode_table:
1133 .byte 60, 80 # 0108
1134 .byte 25, 132 # 0109
1135 .byte 43, 132 # 010A
1136 .byte 50, 132 # 010B
1137 .byte 60, 132 # 010C
1138#endif /* CONFIG_VIDEO_VESA */
1139
1140# Scan for video modes. A bit dirty, but should work.
1141mode_scan:
1142 movw $0x0100, %cx # Start with mode 0
1143scm1: movb $0, %ah # Test the mode
1144 movb %cl, %al
1145 int $0x10
1146 movb $0x0f, %ah
1147 int $0x10
1148 cmpb %cl, %al
1149 jnz scm2 # Mode not set
1150
1151 movw $0x3c0, %dx # Test if it's a text mode
1152 movb $0x10, %al # Mode bits
1153 call inidx
1154 andb $0x03, %al
1155 jnz scm2
1156
1157 movb $0xce, %dl # Another set of mode bits
1158 movb $0x06, %al
1159 call inidx
1160 shrb %al
1161 jc scm2
1162
1163 movb $0xd4, %dl # Cursor location
1164 movb $0x0f, %al
1165 call inidx
1166 orb %al, %al
1167 jnz scm2
1168
1169 movw %cx, %ax # Ok, store the mode
1170 stosw
1171 movb %gs:(0x484), %al # Number of rows
1172 incb %al
1173 stosb
1174 movw %gs:(0x44a), %ax # Number of columns
1175 stosb
1176scm2: incb %cl
1177 jns scm1
1178
1179 movw $0x0003, %ax # Return back to mode 3
1180 int $0x10
1181 ret
1182
1183tstidx: outw %ax, %dx # OUT DX,AX and inidx
1184inidx: outb %al, %dx # Read from indexed VGA register
1185 incw %dx # AL=index, DX=index reg port -> AL=data
1186 inb %dx, %al
1187 decw %dx
1188 ret
1189
1190# Try to detect type of SVGA card and supply (usually approximate) video
1191# mode table for it.
1192
1193#ifdef CONFIG_VIDEO_SVGA
1194svga_modes:
1195 leaw svga_table, %si # Test all known SVGA adapters
1196dosvga: lodsw
1197 movw %ax, %bp # Default mode table
1198 orw %ax, %ax
1199 jz didsv1
1200
1201 lodsw # Pointer to test routine
1202 pushw %si
1203 pushw %di
1204 pushw %es
1205 movw $0xc000, %bx
1206 movw %bx, %es
1207 call *%ax # Call test routine
1208 popw %es
1209 popw %di
1210 popw %si
1211 orw %bp, %bp
1212 jz dosvga
1213
1214 movw %bp, %si # Found, copy the modes
1215 movb svga_prefix, %ah
1216cpsvga: lodsb
1217 orb %al, %al
1218 jz didsv
1219
1220 stosw
1221 movsw
1222 jmp cpsvga
1223
1224didsv: movw %si, card_name # Store pointer to card name
1225didsv1: ret
1226
1227# Table of all known SVGA cards. For each card, we store a pointer to
1228# a table of video modes supported by the card and a pointer to a routine
1229# used for testing of presence of the card. The video mode table is always
1230# followed by the name of the card or the chipset.
1231svga_table:
1232 .word ati_md, ati_test
1233 .word oak_md, oak_test
1234 .word paradise_md, paradise_test
1235 .word realtek_md, realtek_test
1236 .word s3_md, s3_test
1237 .word chips_md, chips_test
1238 .word video7_md, video7_test
1239 .word cirrus5_md, cirrus5_test
1240 .word cirrus6_md, cirrus6_test
1241 .word cirrus1_md, cirrus1_test
1242 .word ahead_md, ahead_test
1243 .word everex_md, everex_test
1244 .word genoa_md, genoa_test
1245 .word trident_md, trident_test
1246 .word tseng_md, tseng_test
1247 .word 0
1248
1249# Test routines and mode tables:
1250
1251# S3 - The test algorithm was taken from the SuperProbe package
1252# for XFree86 1.2.1. Report bugs to Christoph.Niemann@linux.org
1253s3_test:
1254 movw $0x0f35, %cx # we store some constants in cl/ch
1255 movw $0x03d4, %dx
1256 movb $0x38, %al
1257 call inidx
1258 movb %al, %bh # store current CRT-register 0x38
1259 movw $0x0038, %ax
1260 call outidx # disable writing to special regs
1261 movb %cl, %al # check whether we can write special reg 0x35
1262 call inidx
1263 movb %al, %bl # save the current value of CRT reg 0x35
1264 andb $0xf0, %al # clear bits 0-3
1265 movb %al, %ah
1266 movb %cl, %al # and write it to CRT reg 0x35
1267 call outidx
1268 call inidx # now read it back
1269 andb %ch, %al # clear the upper 4 bits
1270 jz s3_2 # the first test failed. But we have a
1271
1272 movb %bl, %ah # second chance
1273 movb %cl, %al
1274 call outidx
1275 jmp s3_1 # do the other tests
1276
1277s3_2: movw %cx, %ax # load ah with 0xf and al with 0x35
1278 orb %bl, %ah # set the upper 4 bits of ah with the orig value
1279 call outidx # write ...
1280 call inidx # ... and reread
1281 andb %cl, %al # turn off the upper 4 bits
1282 pushw %ax
1283 movb %bl, %ah # restore old value in register 0x35
1284 movb %cl, %al
1285 call outidx
1286 popw %ax
1287 cmpb %ch, %al # setting lower 4 bits was successful => bad
1288 je no_s3 # writing is allowed => this is not an S3
1289
1290s3_1: movw $0x4838, %ax # allow writing to special regs by putting
1291 call outidx # magic number into CRT-register 0x38
1292 movb %cl, %al # check whether we can write special reg 0x35
1293 call inidx
1294 movb %al, %bl
1295 andb $0xf0, %al
1296 movb %al, %ah
1297 movb %cl, %al
1298 call outidx
1299 call inidx
1300 andb %ch, %al
1301 jnz no_s3 # no, we can't write => no S3
1302
1303 movw %cx, %ax
1304 orb %bl, %ah
1305 call outidx
1306 call inidx
1307 andb %ch, %al
1308 pushw %ax
1309 movb %bl, %ah # restore old value in register 0x35
1310 movb %cl, %al
1311 call outidx
1312 popw %ax
1313 cmpb %ch, %al
1314 jne no_s31 # writing not possible => no S3
1315 movb $0x30, %al
1316 call inidx # now get the S3 id ...
1317 leaw idS3, %di
1318 movw $0x10, %cx
1319 repne
1320 scasb
1321 je no_s31
1322
1323 movb %bh, %ah
1324 movb $0x38, %al
1325 jmp s3rest
1326
1327no_s3: movb $0x35, %al # restore CRT register 0x35
1328 movb %bl, %ah
1329 call outidx
1330no_s31: xorw %bp, %bp # Detection failed
1331s3rest: movb %bh, %ah
1332 movb $0x38, %al # restore old value of CRT register 0x38
1333 jmp outidx
1334
1335idS3: .byte 0x81, 0x82, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95
1336 .byte 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa8, 0xb0
1337
1338s3_md: .byte 0x54, 0x2b, 0x84
1339 .byte 0x55, 0x19, 0x84
1340 .byte 0
1341 .ascii "S3"
1342 .byte 0
1343
1344# ATI cards.
1345ati_test:
1346 leaw idati, %si
1347 movw $0x31, %di
1348 movw $0x09, %cx
1349 repe
1350 cmpsb
1351 je atiok
1352
1353 xorw %bp, %bp
1354atiok: ret
1355
1356idati: .ascii "761295520"
1357
1358ati_md: .byte 0x23, 0x19, 0x84
1359 .byte 0x33, 0x2c, 0x84
1360 .byte 0x22, 0x1e, 0x64
1361 .byte 0x21, 0x19, 0x64
1362 .byte 0x58, 0x21, 0x50
1363 .byte 0x5b, 0x1e, 0x50
1364 .byte 0
1365 .ascii "ATI"
1366 .byte 0
1367
1368# AHEAD
1369ahead_test:
1370 movw $0x200f, %ax
1371 movw $0x3ce, %dx
1372 outw %ax, %dx
1373 incw %dx
1374 inb %dx, %al
1375 cmpb $0x20, %al
1376 je isahed
1377
1378 cmpb $0x21, %al
1379 je isahed
1380
1381 xorw %bp, %bp
1382isahed: ret
1383
1384ahead_md:
1385 .byte 0x22, 0x2c, 0x84
1386 .byte 0x23, 0x19, 0x84
1387 .byte 0x24, 0x1c, 0x84
1388 .byte 0x2f, 0x32, 0xa0
1389 .byte 0x32, 0x22, 0x50
1390 .byte 0x34, 0x42, 0x50
1391 .byte 0
1392 .ascii "Ahead"
1393 .byte 0
1394
1395# Chips & Tech.
1396chips_test:
1397 movw $0x3c3, %dx
1398 inb %dx, %al
1399 orb $0x10, %al
1400 outb %al, %dx
1401 movw $0x104, %dx
1402 inb %dx, %al
1403 movb %al, %bl
1404 movw $0x3c3, %dx
1405 inb %dx, %al
1406 andb $0xef, %al
1407 outb %al, %dx
1408 cmpb $0xa5, %bl
1409 je cantok
1410
1411 xorw %bp, %bp
1412cantok: ret
1413
1414chips_md:
1415 .byte 0x60, 0x19, 0x84
1416 .byte 0x61, 0x32, 0x84
1417 .byte 0
1418 .ascii "Chips & Technologies"
1419 .byte 0
1420
1421# Cirrus Logic 5X0
1422cirrus1_test:
1423 movw $0x3d4, %dx
1424 movb $0x0c, %al
1425 outb %al, %dx
1426 incw %dx
1427 inb %dx, %al
1428 movb %al, %bl
1429 xorb %al, %al
1430 outb %al, %dx
1431 decw %dx
1432 movb $0x1f, %al
1433 outb %al, %dx
1434 incw %dx
1435 inb %dx, %al
1436 movb %al, %bh
1437 xorb %ah, %ah
1438 shlb $4, %al
1439 movw %ax, %cx
1440 movb %bh, %al
1441 shrb $4, %al
1442 addw %ax, %cx
1443 shlw $8, %cx
1444 addw $6, %cx
1445 movw %cx, %ax
1446 movw $0x3c4, %dx
1447 outw %ax, %dx
1448 incw %dx
1449 inb %dx, %al
1450 andb %al, %al
1451 jnz nocirr
1452
1453 movb %bh, %al
1454 outb %al, %dx
1455 inb %dx, %al
1456 cmpb $0x01, %al
1457 je iscirr
1458
1459nocirr: xorw %bp, %bp
1460iscirr: movw $0x3d4, %dx
1461 movb %bl, %al
1462 xorb %ah, %ah
1463 shlw $8, %ax
1464 addw $0x0c, %ax
1465 outw %ax, %dx
1466 ret
1467
1468cirrus1_md:
1469 .byte 0x1f, 0x19, 0x84
1470 .byte 0x20, 0x2c, 0x84
1471 .byte 0x22, 0x1e, 0x84
1472 .byte 0x31, 0x25, 0x64
1473 .byte 0
1474 .ascii "Cirrus Logic 5X0"
1475 .byte 0
1476
1477# Cirrus Logic 54XX
1478cirrus5_test:
1479 movw $0x3c4, %dx
1480 movb $6, %al
1481 call inidx
1482 movb %al, %bl # BL=backup
1483 movw $6, %ax
1484 call tstidx
1485 cmpb $0x0f, %al
1486 jne c5fail
1487
1488 movw $0x1206, %ax
1489 call tstidx
1490 cmpb $0x12, %al
1491 jne c5fail
1492
1493 movb $0x1e, %al
1494 call inidx
1495 movb %al, %bh
1496 movb %bh, %ah
1497 andb $0xc0, %ah
1498 movb $0x1e, %al
1499 call tstidx
1500 andb $0x3f, %al
1501 jne c5xx
1502
1503 movb $0x1e, %al
1504 movb %bh, %ah
1505 orb $0x3f, %ah
1506 call tstidx
1507 xorb $0x3f, %al
1508 andb $0x3f, %al
1509c5xx: pushf
1510 movb $0x1e, %al
1511 movb %bh, %ah
1512 outw %ax, %dx
1513 popf
1514 je c5done
1515
1516c5fail: xorw %bp, %bp
1517c5done: movb $6, %al
1518 movb %bl, %ah
1519 outw %ax, %dx
1520 ret
1521
1522cirrus5_md:
1523 .byte 0x14, 0x19, 0x84
1524 .byte 0x54, 0x2b, 0x84
1525 .byte 0
1526 .ascii "Cirrus Logic 54XX"
1527 .byte 0
1528
1529# Cirrus Logic 64XX -- no known extra modes, but must be identified, because
1530# it's misidentified by the Ahead test.
1531cirrus6_test:
1532 movw $0x3ce, %dx
1533 movb $0x0a, %al
1534 call inidx
1535 movb %al, %bl # BL=backup
1536 movw $0xce0a, %ax
1537 call tstidx
1538 orb %al, %al
1539 jne c2fail
1540
1541 movw $0xec0a, %ax
1542 call tstidx
1543 cmpb $0x01, %al
1544 jne c2fail
1545
1546 movb $0xaa, %al
1547 call inidx # 4X, 5X, 7X and 8X are valid 64XX chip ID's.
1548 shrb $4, %al
1549 subb $4, %al
1550 jz c6done
1551
1552 decb %al
1553 jz c6done
1554
1555 subb $2, %al
1556 jz c6done
1557
1558 decb %al
1559 jz c6done
1560
1561c2fail: xorw %bp, %bp
1562c6done: movb $0x0a, %al
1563 movb %bl, %ah
1564 outw %ax, %dx
1565 ret
1566
1567cirrus6_md:
1568 .byte 0
1569 .ascii "Cirrus Logic 64XX"
1570 .byte 0
1571
1572# Everex / Trident
1573everex_test:
1574 movw $0x7000, %ax
1575 xorw %bx, %bx
1576 int $0x10
1577 cmpb $0x70, %al
1578 jne noevrx
1579
1580 shrw $4, %dx
1581 cmpw $0x678, %dx
1582 je evtrid
1583
1584 cmpw $0x236, %dx
1585 jne evrxok
1586
1587evtrid: leaw trident_md, %bp
1588evrxok: ret
1589
1590noevrx: xorw %bp, %bp
1591 ret
1592
1593everex_md:
1594 .byte 0x03, 0x22, 0x50
1595 .byte 0x04, 0x3c, 0x50
1596 .byte 0x07, 0x2b, 0x64
1597 .byte 0x08, 0x4b, 0x64
1598 .byte 0x0a, 0x19, 0x84
1599 .byte 0x0b, 0x2c, 0x84
1600 .byte 0x16, 0x1e, 0x50
1601 .byte 0x18, 0x1b, 0x64
1602 .byte 0x21, 0x40, 0xa0
1603 .byte 0x40, 0x1e, 0x84
1604 .byte 0
1605 .ascii "Everex/Trident"
1606 .byte 0
1607
1608# Genoa.
1609genoa_test:
1610 leaw idgenoa, %si # Check Genoa 'clues'
1611 xorw %ax, %ax
1612 movb %es:(0x37), %al
1613 movw %ax, %di
1614 movw $0x04, %cx
1615 decw %si
1616 decw %di
1617l1: incw %si
1618 incw %di
1619 movb (%si), %al
1620 testb %al, %al
1621 jz l2
1622
1623 cmpb %es:(%di), %al
1624l2: loope l1
1625 orw %cx, %cx
1626 je isgen
1627
1628 xorw %bp, %bp
1629isgen: ret
1630
1631idgenoa: .byte 0x77, 0x00, 0x99, 0x66
1632
1633genoa_md:
1634 .byte 0x58, 0x20, 0x50
1635 .byte 0x5a, 0x2a, 0x64
1636 .byte 0x60, 0x19, 0x84
1637 .byte 0x61, 0x1d, 0x84
1638 .byte 0x62, 0x20, 0x84
1639 .byte 0x63, 0x2c, 0x84
1640 .byte 0x64, 0x3c, 0x84
1641 .byte 0x6b, 0x4f, 0x64
1642 .byte 0x72, 0x3c, 0x50
1643 .byte 0x74, 0x42, 0x50
1644 .byte 0x78, 0x4b, 0x64
1645 .byte 0
1646 .ascii "Genoa"
1647 .byte 0
1648
1649# OAK
1650oak_test:
1651 leaw idoakvga, %si
1652 movw $0x08, %di
1653 movw $0x08, %cx
1654 repe
1655 cmpsb
1656 je isoak
1657
1658 xorw %bp, %bp
1659isoak: ret
1660
1661idoakvga: .ascii "OAK VGA "
1662
1663oak_md: .byte 0x4e, 0x3c, 0x50
1664 .byte 0x4f, 0x3c, 0x84
1665 .byte 0x50, 0x19, 0x84
1666 .byte 0x51, 0x2b, 0x84
1667 .byte 0
1668 .ascii "OAK"
1669 .byte 0
1670
1671# WD Paradise.
1672paradise_test:
1673 leaw idparadise, %si
1674 movw $0x7d, %di
1675 movw $0x04, %cx
1676 repe
1677 cmpsb
1678 je ispara
1679
1680 xorw %bp, %bp
1681ispara: ret
1682
1683idparadise: .ascii "VGA="
1684
1685paradise_md:
1686 .byte 0x41, 0x22, 0x50
1687 .byte 0x47, 0x1c, 0x84
1688 .byte 0x55, 0x19, 0x84
1689 .byte 0x54, 0x2c, 0x84
1690 .byte 0
1691 .ascii "Paradise"
1692 .byte 0
1693
1694# Trident.
1695trident_test:
1696 movw $0x3c4, %dx
1697 movb $0x0e, %al
1698 outb %al, %dx
1699 incw %dx
1700 inb %dx, %al
1701 xchgb %al, %ah
1702 xorb %al, %al
1703 outb %al, %dx
1704 inb %dx, %al
1705 xchgb %ah, %al
1706 movb %al, %bl # Strange thing ... in the book this wasn't
1707 andb $0x02, %bl # necessary but it worked on my card which
1708 jz setb2 # is a trident. Without it the screen goes
1709 # blurred ...
1710 andb $0xfd, %al
1711 jmp clrb2
1712
1713setb2: orb $0x02, %al
1714clrb2: outb %al, %dx
1715 andb $0x0f, %ah
1716 cmpb $0x02, %ah
1717 je istrid
1718
1719 xorw %bp, %bp
1720istrid: ret
1721
1722trident_md:
1723 .byte 0x50, 0x1e, 0x50
1724 .byte 0x51, 0x2b, 0x50
1725 .byte 0x52, 0x3c, 0x50
1726 .byte 0x57, 0x19, 0x84
1727 .byte 0x58, 0x1e, 0x84
1728 .byte 0x59, 0x2b, 0x84
1729 .byte 0x5a, 0x3c, 0x84
1730 .byte 0
1731 .ascii "Trident"
1732 .byte 0
1733
1734# Tseng.
1735tseng_test:
1736 movw $0x3cd, %dx
1737 inb %dx, %al # Could things be this simple ! :-)
1738 movb %al, %bl
1739 movb $0x55, %al
1740 outb %al, %dx
1741 inb %dx, %al
1742 movb %al, %ah
1743 movb %bl, %al
1744 outb %al, %dx
1745 cmpb $0x55, %ah
1746 je istsen
1747
1748isnot: xorw %bp, %bp
1749istsen: ret
1750
1751tseng_md:
1752 .byte 0x26, 0x3c, 0x50
1753 .byte 0x2a, 0x28, 0x64
1754 .byte 0x23, 0x19, 0x84
1755 .byte 0x24, 0x1c, 0x84
1756 .byte 0x22, 0x2c, 0x84
1757 .byte 0x21, 0x3c, 0x84
1758 .byte 0
1759 .ascii "Tseng"
1760 .byte 0
1761
1762# Video7.
1763video7_test:
1764 movw $0x3cc, %dx
1765 inb %dx, %al
1766 movw $0x3b4, %dx
1767 andb $0x01, %al
1768 jz even7
1769
1770 movw $0x3d4, %dx
1771even7: movb $0x0c, %al
1772 outb %al, %dx
1773 incw %dx
1774 inb %dx, %al
1775 movb %al, %bl
1776 movb $0x55, %al
1777 outb %al, %dx
1778 inb %dx, %al
1779 decw %dx
1780 movb $0x1f, %al
1781 outb %al, %dx
1782 incw %dx
1783 inb %dx, %al
1784 movb %al, %bh
1785 decw %dx
1786 movb $0x0c, %al
1787 outb %al, %dx
1788 incw %dx
1789 movb %bl, %al
1790 outb %al, %dx
1791 movb $0x55, %al
1792 xorb $0xea, %al
1793 cmpb %bh, %al
1794 jne isnot
1795
1796 movb $VIDEO_FIRST_V7>>8, svga_prefix # Use special mode switching
1797 ret
1798
1799video7_md:
1800 .byte 0x40, 0x2b, 0x50
1801 .byte 0x43, 0x3c, 0x50
1802 .byte 0x44, 0x3c, 0x64
1803 .byte 0x41, 0x19, 0x84
1804 .byte 0x42, 0x2c, 0x84
1805 .byte 0x45, 0x1c, 0x84
1806 .byte 0
1807 .ascii "Video 7"
1808 .byte 0
1809
1810# Realtek VGA
1811realtek_test:
1812 leaw idrtvga, %si
1813 movw $0x45, %di
1814 movw $0x0b, %cx
1815 repe
1816 cmpsb
1817 je isrt
1818
1819 xorw %bp, %bp
1820isrt: ret
1821
1822idrtvga: .ascii "REALTEK VGA"
1823
1824realtek_md:
1825 .byte 0x1a, 0x3c, 0x50
1826 .byte 0x1b, 0x19, 0x84
1827 .byte 0x1c, 0x1e, 0x84
1828 .byte 0x1d, 0x2b, 0x84
1829 .byte 0x1e, 0x3c, 0x84
1830 .byte 0
1831 .ascii "REALTEK"
1832 .byte 0
1833
1834#endif /* CONFIG_VIDEO_SVGA */
1835
1836# User-defined local mode table (VGA only)
1837#ifdef CONFIG_VIDEO_LOCAL
1838local_modes:
1839 leaw local_mode_table, %si
1840locm1: lodsw
1841 orw %ax, %ax
1842 jz locm2
1843
1844 stosw
1845 movsw
1846 jmp locm1
1847
1848locm2: ret
1849
1850# This is the table of local video modes which can be supplied manually
1851# by the user. Each entry consists of mode ID (word) and dimensions
1852# (byte for column count and another byte for row count). These modes
1853# are placed before all SVGA and VESA modes and override them if table
1854# compacting is enabled. The table must end with a zero word followed
1855# by NUL-terminated video adapter name.
1856local_mode_table:
1857 .word 0x0100 # Example: 40x25
1858 .byte 25,40
1859 .word 0
1860 .ascii "Local"
1861 .byte 0
1862#endif /* CONFIG_VIDEO_LOCAL */
1863
1864# Read a key and return the ASCII code in al, scan code in ah
1865getkey: xorb %ah, %ah
1866 int $0x16
1867 ret
1868
1869# Read a key with a timeout of 30 seconds.
1870# The hardware clock is used to get the time.
1871getkt: call gettime
1872 addb $30, %al # Wait 30 seconds
1873 cmpb $60, %al
1874 jl lminute
1875
1876 subb $60, %al
1877lminute:
1878 movb %al, %cl
1879again: movb $0x01, %ah
1880 int $0x16
1881 jnz getkey # key pressed, so get it
1882
1883 call gettime
1884 cmpb %cl, %al
1885 jne again
1886
1887 movb $0x20, %al # timeout, return `space'
1888 ret
1889
1890# Flush the keyboard buffer
1891flush: movb $0x01, %ah
1892 int $0x16
1893 jz empty
1894
1895 xorb %ah, %ah
1896 int $0x16
1897 jmp flush
1898
1899empty: ret
1900
1901# Print hexadecimal number.
1902prthw: pushw %ax
1903 movb %ah, %al
1904 call prthb
1905 popw %ax
1906prthb: pushw %ax
1907 shrb $4, %al
1908 call prthn
1909 popw %ax
1910 andb $0x0f, %al
1911prthn: cmpb $0x0a, %al
1912 jc prth1
1913
1914 addb $0x07, %al
1915prth1: addb $0x30, %al
1916 jmp prtchr
1917
1918# Print decimal number in al
1919prtdec: pushw %ax
1920 pushw %cx
1921 xorb %ah, %ah
1922 movb $0x0a, %cl
1923 idivb %cl
1924 cmpb $0x09, %al
1925 jbe lt100
1926
1927 call prtdec
1928 jmp skip10
1929
1930lt100: addb $0x30, %al
1931 call prtchr
1932skip10: movb %ah, %al
1933 addb $0x30, %al
1934 call prtchr
1935 popw %cx
1936 popw %ax
1937 ret
1938
1939store_edid:
1940#ifdef CONFIG_FIRMWARE_EDID
1941 pushw %es # just save all registers
1942 pushw %ax
1943 pushw %bx
1944 pushw %cx
1945 pushw %dx
1946 pushw %di
1947
1948 pushw %fs
1949 popw %es
1950
1951 movl $0x13131313, %eax # memset block with 0x13
1952 movw $32, %cx
1953 movw $0x140, %di
1954 cld
1955 rep
1956 stosl
1957
1958 cmpw $0x0200, vbe_version # only do EDID on >= VBE2.0
1959 jl no_edid
1960
1961 pushw %es # save ES
1962 xorw %di, %di # Report Capability
1963 pushw %di
1964 popw %es # ES:DI must be 0:0
1965 movw $0x4f15, %ax
1966 xorw %bx, %bx
1967 xorw %cx, %cx
1968 int $0x10
1969 popw %es # restore ES
1970
1971 cmpb $0x00, %ah # call successful
1972 jne no_edid
1973
1974 cmpb $0x4f, %al # function supported
1975 jne no_edid
1976
1977 movw $0x4f15, %ax # do VBE/DDC
1978 movw $0x01, %bx
1979 movw $0x00, %cx
1980 movw $0x00, %dx
1981 movw $0x140, %di
1982 int $0x10
1983
1984no_edid:
1985 popw %di # restore all registers
1986 popw %dx
1987 popw %cx
1988 popw %bx
1989 popw %ax
1990 popw %es
1991#endif
1992 ret
1993
1994# VIDEO_SELECT-only variables
1995mt_end: .word 0 # End of video mode table if built
1996edit_buf: .space 6 # Line editor buffer
1997card_name: .word 0 # Pointer to adapter name
1998scanning: .byte 0 # Performing mode scan
1999do_restore: .byte 0 # Screen contents altered during mode change
2000svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes
2001graphic_mode: .byte 0 # Graphic mode with a linear frame buffer
2002dac_size: .byte 6 # DAC bit depth
2003vbe_version: .word 0 # VBE bios version
2004
2005# Status messages
2006keymsg: .ascii "Press <RETURN> to see video modes available, "
2007 .ascii "<SPACE> to continue or wait 30 secs"
2008 .byte 0x0d, 0x0a, 0
2009
2010listhdr: .byte 0x0d, 0x0a
2011 .ascii "Mode: COLSxROWS:"
2012
2013crlft: .byte 0x0d, 0x0a, 0
2014
2015prompt: .byte 0x0d, 0x0a
2016 .asciz "Enter mode number or `scan': "
2017
2018unknt: .asciz "Unknown mode ID. Try again."
2019
2020badmdt: .ascii "You passed an undefined mode number."
2021 .byte 0x0d, 0x0a, 0
2022
2023vesaer: .ascii "Error: Scanning of VESA modes failed. Please "
2024 .ascii "report to <mj@ucw.cz>."
2025 .byte 0x0d, 0x0a, 0
2026
2027old_name: .asciz "CGA/MDA/HGA"
2028
2029ega_name: .asciz "EGA"
2030
2031svga_name: .ascii " "
2032
2033vga_name: .asciz "VGA"
2034
2035vesa_name: .asciz "VESA"
2036
2037name_bann: .asciz "Video adapter: "
2038#endif /* CONFIG_VIDEO_SELECT */
2039
2040# Other variables:
2041adapter: .byte 0 # Video adapter: 0=CGA/MDA/HGA,1=EGA,2=VGA
2042video_segment: .word 0xb800 # Video memory segment
2043force_size: .word 0 # Use this size instead of the one in BIOS vars
diff --git a/arch/i386/kernel/verify_cpu.S b/arch/i386/kernel/verify_cpu.S
deleted file mode 100644
index fff4aa61d7c3..000000000000
--- a/arch/i386/kernel/verify_cpu.S
+++ /dev/null
@@ -1,94 +0,0 @@
1/* Check if CPU has some minimum CPUID bits
2 This runs in 16bit mode so that the caller can still use the BIOS
3 to output errors on the screen */
4#include <asm/cpufeature.h>
5#include <asm/msr.h>
6
7verify_cpu:
8 pushfl # Save caller passed flags
9 pushl $0 # Kill any dangerous flags
10 popfl
11
12#if CONFIG_X86_MINIMUM_CPU_FAMILY >= 4
13 pushfl
14 pop %eax
15 orl $(1<<18),%eax # try setting AC
16 push %eax
17 popfl
18 pushfl
19 popl %eax
20 testl $(1<<18),%eax
21 jz bad
22#endif
23#if REQUIRED_MASK0 != 0
24 pushfl # standard way to check for cpuid
25 popl %eax
26 movl %eax,%ebx
27 xorl $0x200000,%eax
28 pushl %eax
29 popfl
30 pushfl
31 popl %eax
32 cmpl %eax,%ebx
33 pushfl # standard way to check for cpuid
34 popl %eax
35 movl %eax,%ebx
36 xorl $0x200000,%eax
37 pushl %eax
38 popfl
39 pushfl
40 popl %eax
41 cmpl %eax,%ebx
42 jz bad # REQUIRED_MASK0 != 0 requires CPUID
43
44 movl $0x0,%eax # See if cpuid 1 is implemented
45 cpuid
46 cmpl $0x1,%eax
47 jb bad # no cpuid 1
48
49#if REQUIRED_MASK0 & NEED_CMPXCHG64
50 /* Some VIA C3s need magic MSRs to enable CX64. Do this here */
51 cmpl $0x746e6543,%ebx # Cent
52 jne 1f
53 cmpl $0x48727561,%edx # aurH
54 jne 1f
55 cmpl $0x736c7561,%ecx # auls
56 jne 1f
57 movl $1,%eax # check model
58 cpuid
59 movl %eax,%ebx
60 shr $8,%ebx
61 andl $0xf,%ebx
62 cmp $6,%ebx # check family == 6
63 jne 1f
64 shr $4,%eax
65 andl $0xf,%eax
66 cmpl $6,%eax # check model >= 6
67 jb 1f
68 # assume models >= 6 all support this MSR
69 movl $MSR_VIA_FCR,%ecx
70 rdmsr
71 orl $((1<<1)|(1<<7)),%eax # enable CMPXCHG64 and PGE
72 wrmsr
731:
74#endif
75 movl $0x1,%eax # Does the cpu have what it takes
76 cpuid
77
78#if CONFIG_X86_MINIMUM_CPU_FAMILY > 4
79#error add proper model checking here
80#endif
81
82 andl $REQUIRED_MASK0,%edx
83 xorl $REQUIRED_MASK0,%edx
84 jnz bad
85#endif /* REQUIRED_MASK0 */
86
87 popfl
88 xor %eax,%eax
89 ret
90
91bad:
92 popfl
93 movl $1,%eax
94 ret
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-15 18:46:21 -0500