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1/*
2 * arch/s390/kernel/head.S
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com),
8 * Rob van der Heij (rvdhei@iae.nl)
9 *
10 * There are 5 different IPL methods
11 * 1) load the image directly into ram at address 0 and do an PSW restart
12 * 2) linload will load the image from address 0x10000 to memory 0x10000
13 * and start the code thru LPSW 0x0008000080010000 (VM only, deprecated)
14 * 3) generate the tape ipl header, store the generated image on a tape
15 * and ipl from it
16 * In case of SL tape you need to IPL 5 times to get past VOL1 etc
17 * 4) generate the vm reader ipl header, move the generated image to the
18 * VM reader (use option NOH!) and do a ipl from reader (VM only)
19 * 5) direct call of start by the SALIPL loader
20 * We use the cpuid to distinguish between VM and native ipl
21 * params for kernel are pushed to 0x10400 (see setup.h)
22
23 Changes:
24 Okt 25 2000 <rvdheij@iae.nl>
25 added code to skip HDR and EOF to allow SL tape IPL (5 retries)
26 changed first CCW from rewind to backspace block
27
28 */
29
30#include <linux/config.h>
31#include <asm/setup.h>
32#include <asm/lowcore.h>
33#include <asm/offsets.h>
34#include <asm/thread_info.h>
35#include <asm/page.h>
36
37#ifndef CONFIG_IPL
38 .org 0
39 .long 0x00080000,0x80000000+startup # Just a restart PSW
40#else
41#ifdef CONFIG_IPL_TAPE
42#define IPL_BS 1024
43 .org 0
44 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
45 .long 0x27000000,0x60000001 # by ipl to addresses 0-23.
46 .long 0x02000000,0x20000000+IPL_BS # (a PSW and two CCWs).
47 .long 0x00000000,0x00000000 # external old psw
48 .long 0x00000000,0x00000000 # svc old psw
49 .long 0x00000000,0x00000000 # program check old psw
50 .long 0x00000000,0x00000000 # machine check old psw
51 .long 0x00000000,0x00000000 # io old psw
52 .long 0x00000000,0x00000000
53 .long 0x00000000,0x00000000
54 .long 0x00000000,0x00000000
55 .long 0x000a0000,0x00000058 # external new psw
56 .long 0x000a0000,0x00000060 # svc new psw
57 .long 0x000a0000,0x00000068 # program check new psw
58 .long 0x000a0000,0x00000070 # machine check new psw
59 .long 0x00080000,0x80000000+.Lioint # io new psw
60
61 .org 0x100
62#
63# subroutine for loading from tape
64# Paramters:
65# R1 = device number
66# R2 = load address
67.Lloader:
68 st %r14,.Lldret
69 la %r3,.Lorbread # r3 = address of orb
70 la %r5,.Lirb # r5 = address of irb
71 st %r2,.Lccwread+4 # initialize CCW data addresses
72 lctl %c6,%c6,.Lcr6
73 slr %r2,%r2
74.Lldlp:
75 la %r6,3 # 3 retries
76.Lssch:
77 ssch 0(%r3) # load chunk of IPL_BS bytes
78 bnz .Llderr
79.Lw4end:
80 bas %r14,.Lwait4io
81 tm 8(%r5),0x82 # do we have a problem ?
82 bnz .Lrecov
83 slr %r7,%r7
84 icm %r7,3,10(%r5) # get residual count
85 lcr %r7,%r7
86 la %r7,IPL_BS(%r7) # IPL_BS-residual=#bytes read
87 ar %r2,%r7 # add to total size
88 tm 8(%r5),0x01 # found a tape mark ?
89 bnz .Ldone
90 l %r0,.Lccwread+4 # update CCW data addresses
91 ar %r0,%r7
92 st %r0,.Lccwread+4
93 b .Lldlp
94.Ldone:
95 l %r14,.Lldret
96 br %r14 # r2 contains the total size
97.Lrecov:
98 bas %r14,.Lsense # do the sensing
99 bct %r6,.Lssch # dec. retry count & branch
100 b .Llderr
101#
102# Sense subroutine
103#
104.Lsense:
105 st %r14,.Lsnsret
106 la %r7,.Lorbsense
107 ssch 0(%r7) # start sense command
108 bnz .Llderr
109 bas %r14,.Lwait4io
110 l %r14,.Lsnsret
111 tm 8(%r5),0x82 # do we have a problem ?
112 bnz .Llderr
113 br %r14
114#
115# Wait for interrupt subroutine
116#
117.Lwait4io:
118 lpsw .Lwaitpsw
119.Lioint:
120 c %r1,0xb8 # compare subchannel number
121 bne .Lwait4io
122 tsch 0(%r5)
123 slr %r0,%r0
124 tm 8(%r5),0x82 # do we have a problem ?
125 bnz .Lwtexit
126 tm 8(%r5),0x04 # got device end ?
127 bz .Lwait4io
128.Lwtexit:
129 br %r14
130.Llderr:
131 lpsw .Lcrash
132
133 .align 8
134.Lorbread:
135 .long 0x00000000,0x0080ff00,.Lccwread
136 .align 8
137.Lorbsense:
138 .long 0x00000000,0x0080ff00,.Lccwsense
139 .align 8
140.Lccwread:
141 .long 0x02200000+IPL_BS,0x00000000
142.Lccwsense:
143 .long 0x04200001,0x00000000
144.Lwaitpsw:
145 .long 0x020a0000,0x80000000+.Lioint
146
147.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
148.Lcr6: .long 0xff000000
149 .align 8
150.Lcrash:.long 0x000a0000,0x00000000
151.Lldret:.long 0
152.Lsnsret: .long 0
153#endif /* CONFIG_IPL_TAPE */
154
155#ifdef CONFIG_IPL_VM
156#define IPL_BS 0x730
157 .org 0
158 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
159 .long 0x02000018,0x60000050 # by ipl to addresses 0-23.
160 .long 0x02000068,0x60000050 # (a PSW and two CCWs).
161 .fill 80-24,1,0x40 # bytes 24-79 are discarded !!
162 .long 0x020000f0,0x60000050 # The next 160 byte are loaded
163 .long 0x02000140,0x60000050 # to addresses 0x18-0xb7
164 .long 0x02000190,0x60000050 # They form the continuation
165 .long 0x020001e0,0x60000050 # of the CCW program started
166 .long 0x02000230,0x60000050 # by ipl and load the range
167 .long 0x02000280,0x60000050 # 0x0f0-0x730 from the image
168 .long 0x020002d0,0x60000050 # to the range 0x0f0-0x730
169 .long 0x02000320,0x60000050 # in memory. At the end of
170 .long 0x02000370,0x60000050 # the channel program the PSW
171 .long 0x020003c0,0x60000050 # at location 0 is loaded.
172 .long 0x02000410,0x60000050 # Initial processing starts
173 .long 0x02000460,0x60000050 # at 0xf0 = iplstart.
174 .long 0x020004b0,0x60000050
175 .long 0x02000500,0x60000050
176 .long 0x02000550,0x60000050
177 .long 0x020005a0,0x60000050
178 .long 0x020005f0,0x60000050
179 .long 0x02000640,0x60000050
180 .long 0x02000690,0x60000050
181 .long 0x020006e0,0x20000050
182
183 .org 0xf0
184#
185# subroutine for loading cards from the reader
186#
187.Lloader:
188 la %r3,.Lorb # r2 = address of orb into r2
189 la %r5,.Lirb # r4 = address of irb
190 la %r6,.Lccws
191 la %r7,20
192.Linit:
193 st %r2,4(%r6) # initialize CCW data addresses
194 la %r2,0x50(%r2)
195 la %r6,8(%r6)
196 bct 7,.Linit
197
198 lctl %c6,%c6,.Lcr6 # set IO subclass mask
199 slr %r2,%r2
200.Lldlp:
201 ssch 0(%r3) # load chunk of 1600 bytes
202 bnz .Llderr
203.Lwait4irq:
204 mvc 0x78(8),.Lnewpsw # set up IO interrupt psw
205 lpsw .Lwaitpsw
206.Lioint:
207 c %r1,0xb8 # compare subchannel number
208 bne .Lwait4irq
209 tsch 0(%r5)
210
211 slr %r0,%r0
212 ic %r0,8(%r5) # get device status
213 chi %r0,8 # channel end ?
214 be .Lcont
215 chi %r0,12 # channel end + device end ?
216 be .Lcont
217
218 l %r0,4(%r5)
219 s %r0,8(%r3) # r0/8 = number of ccws executed
220 mhi %r0,10 # *10 = number of bytes in ccws
221 lh %r3,10(%r5) # get residual count
222 sr %r0,%r3 # #ccws*80-residual=#bytes read
223 ar %r2,%r0
224
225 br %r14 # r2 contains the total size
226
227.Lcont:
228 ahi %r2,0x640 # add 0x640 to total size
229 la %r6,.Lccws
230 la %r7,20
231.Lincr:
232 l %r0,4(%r6) # update CCW data addresses
233 ahi %r0,0x640
234 st %r0,4(%r6)
235 ahi %r6,8
236 bct 7,.Lincr
237
238 b .Lldlp
239.Llderr:
240 lpsw .Lcrash
241
242 .align 8
243.Lorb: .long 0x00000000,0x0080ff00,.Lccws
244.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
245.Lcr6: .long 0xff000000
246.Lloadp:.long 0,0
247 .align 8
248.Lcrash:.long 0x000a0000,0x00000000
249.Lnewpsw:
250 .long 0x00080000,0x80000000+.Lioint
251.Lwaitpsw:
252 .long 0x020a0000,0x80000000+.Lioint
253
254 .align 8
255.Lccws: .rept 19
256 .long 0x02600050,0x00000000
257 .endr
258 .long 0x02200050,0x00000000
259#endif /* CONFIG_IPL_VM */
260
261iplstart:
262 lh %r1,0xb8 # test if subchannel number
263 bct %r1,.Lnoload # is valid
264 l %r1,0xb8 # load ipl subchannel number
265 la %r2,IPL_BS # load start address
266 bas %r14,.Lloader # load rest of ipl image
267 larl %r12,_pstart # pointer to parameter area
268 st %r1,IPL_DEVICE+4-PARMAREA(%r12) # store ipl device number
269
270#
271# load parameter file from ipl device
272#
273.Lagain1:
274 l %r2,INITRD_START+4-PARMAREA(%r12)# use ramdisk location as temp
275 bas %r14,.Lloader # load parameter file
276 ltr %r2,%r2 # got anything ?
277 bz .Lnopf
278 chi %r2,895
279 bnh .Lnotrunc
280 la %r2,895
281.Lnotrunc:
282 l %r4,INITRD_START+4-PARMAREA(%r12)
283 clc 0(3,%r4),.L_hdr # if it is HDRx
284 bz .Lagain1 # skip dataset header
285 clc 0(3,%r4),.L_eof # if it is EOFx
286 bz .Lagain1 # skip dateset trailer
287 la %r5,0(%r4,%r2)
288 lr %r3,%r2
289.Lidebc:
290 tm 0(%r5),0x80 # high order bit set ?
291 bo .Ldocv # yes -> convert from EBCDIC
292 ahi %r5,-1
293 bct %r3,.Lidebc
294 b .Lnocv
295.Ldocv:
296 l %r3,.Lcvtab
297 tr 0(256,%r4),0(%r3) # convert parameters to ascii
298 tr 256(256,%r4),0(%r3)
299 tr 512(256,%r4),0(%r3)
300 tr 768(122,%r4),0(%r3)
301.Lnocv: la %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
302 mvc 0(256,%r3),0(%r4)
303 mvc 256(256,%r3),256(%r4)
304 mvc 512(256,%r3),512(%r4)
305 mvc 768(122,%r3),768(%r4)
306 slr %r0,%r0
307 b .Lcntlp
308.Ldelspc:
309 ic %r0,0(%r2,%r3)
310 chi %r0,0x20 # is it a space ?
311 be .Lcntlp
312 ahi %r2,1
313 b .Leolp
314.Lcntlp:
315 brct %r2,.Ldelspc
316.Leolp:
317 slr %r0,%r0
318 stc %r0,0(%r2,%r3) # terminate buffer
319.Lnopf:
320
321#
322# load ramdisk from ipl device
323#
324.Lagain2:
325 l %r2,INITRD_START+4-PARMAREA(%r12)# load adr. of ramdisk
326 bas %r14,.Lloader # load ramdisk
327 st %r2,INITRD_SIZE+4-PARMAREA(%r12) # store size of ramdisk
328 ltr %r2,%r2
329 bnz .Lrdcont
330 st %r2,INITRD_START+4-PARMAREA(%r12)# no ramdisk found, null it
331.Lrdcont:
332 l %r2,INITRD_START+4-PARMAREA(%r12)
333 clc 0(3,%r2),.L_hdr # skip HDRx and EOFx
334 bz .Lagain2
335 clc 0(3,%r2),.L_eof
336 bz .Lagain2
337
338#ifdef CONFIG_IPL_VM
339#
340# reset files in VM reader
341#
342 stidp __LC_CPUID # store cpuid
343 tm __LC_CPUID,0xff # running VM ?
344 bno .Lnoreset
345 la %r2,.Lreset
346 lhi %r3,26
347 .long 0x83230008
348.Lnoreset:
349#endif
350
351#
352# everything loaded, go for it
353#
354.Lnoload:
355 l %r1,.Lstartup
356 br %r1
357
358.Lstartup: .long startup
359.Lcvtab:.long _ebcasc # ebcdic to ascii table
360.Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
361 .byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
362 .byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold"
363.L_eof: .long 0xc5d6c600 /* C'EOF' */
364.L_hdr: .long 0xc8c4d900 /* C'HDR' */
365#endif /* CONFIG_IPL */
366
367#
368# SALIPL loader support. Based on a patch by Rob van der Heij.
369# This entry point is called directly from the SALIPL loader and
370# doesn't need a builtin ipl record.
371#
372 .org 0x800
373 .globl start
374start:
375 stm %r0,%r15,0x07b0 # store registers
376 basr %r12,%r0
377.base:
378 l %r11,.parm
379 l %r8,.cmd # pointer to command buffer
380
381 ltr %r9,%r9 # do we have SALIPL parameters?
382 bp .sk8x8
383
384 mvc 0(64,%r8),0x00b0 # copy saved registers
385 xc 64(240-64,%r8),0(%r8) # remainder of buffer
386 tr 0(64,%r8),.lowcase
387 b .gotr
388.sk8x8:
389 mvc 0(240,%r8),0(%r9) # copy iplparms into buffer
390.gotr:
391 l %r10,.tbl # EBCDIC to ASCII table
392 tr 0(240,%r8),0(%r10)
393 stidp __LC_CPUID # Are we running on VM maybe
394 cli __LC_CPUID,0xff
395 bnz .test
396 .long 0x83300060 # diag 3,0,x'0060' - storage size
397 b .done
398.test:
399 mvc 0x68(8),.pgmnw # set up pgm check handler
400 l %r2,.fourmeg
401 lr %r3,%r2
402 bctr %r3,%r0 # 4M-1
403.loop: iske %r0,%r3
404 ar %r3,%r2
405.pgmx:
406 sr %r3,%r2
407 la %r3,1(%r3)
408.done:
409 l %r1,.memsize
410 st %r3,4(%r1)
411 slr %r0,%r0
412 st %r0,INITRD_SIZE+4-PARMAREA(%r11)
413 st %r0,INITRD_START+4-PARMAREA(%r11)
414 j startup # continue with startup
415.tbl: .long _ebcasc # translate table
416.cmd: .long COMMAND_LINE # address of command line buffer
417.parm: .long PARMAREA
418.fourmeg: .long 0x00400000 # 4M
419.pgmnw: .long 0x00080000,.pgmx
420.memsize: .long memory_size
421.lowcase:
422 .byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07
423 .byte 0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f
424 .byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17
425 .byte 0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f
426 .byte 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27
427 .byte 0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f
428 .byte 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37
429 .byte 0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f
430 .byte 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47
431 .byte 0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f
432 .byte 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57
433 .byte 0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f
434 .byte 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67
435 .byte 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f
436 .byte 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77
437 .byte 0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f
438
439 .byte 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87
440 .byte 0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f
441 .byte 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97
442 .byte 0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f
443 .byte 0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7
444 .byte 0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf
445 .byte 0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7
446 .byte 0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf
447 .byte 0xc0,0x81,0x82,0x83,0x84,0x85,0x86,0x87 # .abcdefg
448 .byte 0x88,0x89,0xca,0xcb,0xcc,0xcd,0xce,0xcf # hi
449 .byte 0xd0,0x91,0x92,0x93,0x94,0x95,0x96,0x97 # .jklmnop
450 .byte 0x98,0x99,0xda,0xdb,0xdc,0xdd,0xde,0xdf # qr
451 .byte 0xe0,0xe1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7 # ..stuvwx
452 .byte 0xa8,0xa9,0xea,0xeb,0xec,0xed,0xee,0xef # yz
453 .byte 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7
454 .byte 0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff
455
456#
457# startup-code at 0x10000, running in real mode
458# this is called either by the ipl loader or directly by PSW restart
459# or linload or SALIPL
460#
461 .org 0x10000
462startup:basr %r13,0 # get base
463.LPG1: sll %r13,1 # remove high order bit
464 srl %r13,1
465 lhi %r1,1 # mode 1 = esame
466 slr %r0,%r0 # set cpuid to zero
467 sigp %r1,%r0,0x12 # switch to esame mode
468 sam64 # switch to 64 bit mode
469 lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
470 larl %r12,_pstart # pointer to parameter area
471 # move IPL device to lowcore
472 mvc __LC_IPLDEV(4),IPL_DEVICE+4-PARMAREA(%r12)
473
474#
475# clear bss memory
476#
477 larl %r2,__bss_start # start of bss segment
478 larl %r3,_end # end of bss segment
479 sgr %r3,%r2 # length of bss
480 sgr %r4,%r4 #
481 sgr %r5,%r5 # set src,length and pad to zero
482 mvcle %r2,%r4,0 # clear mem
483 jo .-4 # branch back, if not finish
484
485 l %r2,.Lrcp-.LPG1(%r13) # Read SCP forced command word
486.Lservicecall:
487 stosm .Lpmask-.LPG1(%r13),0x01 # authorize ext interrupts
488
489 stctg %r0,%r0,.Lcr-.LPG1(%r13) # get cr0
490 la %r1,0x200 # set bit 22
491 og %r1,.Lcr-.LPG1(%r13) # or old cr0 with r1
492 stg %r1,.Lcr-.LPG1(%r13)
493 lctlg %r0,%r0,.Lcr-.LPG1(%r13) # load modified cr0
494
495 mvc __LC_EXT_NEW_PSW(8),.Lpcmsk-.LPG1(%r13) # set postcall psw
496 larl %r1,.Lsclph
497 stg %r1,__LC_EXT_NEW_PSW+8 # set handler
498
499 larl %r4,_pstart # %r4 is our index for sccb stuff
500 la %r1,.Lsccb-PARMAREA(%r4) # our sccb
501 .insn rre,0xb2200000,%r2,%r1 # service call
502 ipm %r1
503 srl %r1,28 # get cc code
504 xr %r3,%r3
505 chi %r1,3
506 be .Lfchunk-.LPG1(%r13) # leave
507 chi %r1,2
508 be .Lservicecall-.LPG1(%r13)
509 lpsw .Lwaitsclp-.LPG1(%r13)
510.Lsclph:
511 lh %r1,.Lsccbr-PARMAREA(%r4)
512 chi %r1,0x10 # 0x0010 is the sucess code
513 je .Lprocsccb # let's process the sccb
514 chi %r1,0x1f0
515 bne .Lfchunk-.LPG1(%r13) # unhandled error code
516 c %r2,.Lrcp-.LPG1(%r13) # Did we try Read SCP forced
517 bne .Lfchunk-.LPG1(%r13) # if no, give up
518 l %r2,.Lrcp2-.LPG1(%r13) # try with Read SCP
519 b .Lservicecall-.LPG1(%r13)
520.Lprocsccb:
521 lh %r1,.Lscpincr1-PARMAREA(%r4) # use this one if != 0
522 chi %r1,0x00
523 jne .Lscnd
524 lg %r1,.Lscpincr2-PARMAREA(%r4) # otherwise use this one
525.Lscnd:
526 xr %r3,%r3 # same logic
527 ic %r3,.Lscpa1-PARMAREA(%r4)
528 chi %r3,0x00
529 jne .Lcompmem
530 l %r3,.Lscpa2-PARMAREA(%r13)
531.Lcompmem:
532 mlgr %r2,%r1 # mem in MB on 128-bit
533 l %r1,.Lonemb-.LPG1(%r13)
534 mlgr %r2,%r1 # mem size in bytes in %r3
535 b .Lfchunk-.LPG1(%r13)
536
537.Lpmask:
538 .byte 0
539 .align 8
540.Lcr:
541 .quad 0x00 # place holder for cr0
542.Lwaitsclp:
543 .long 0x020A0000
544 .quad .Lsclph
545.Lrcp:
546 .int 0x00120001 # Read SCP forced code
547.Lrcp2:
548 .int 0x00020001 # Read SCP code
549.Lonemb:
550 .int 0x100000
551
552.Lfchunk:
553 # set program check new psw mask
554 mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
555
556#
557# find memory chunks.
558#
559 lgr %r9,%r3 # end of mem
560 larl %r1,.Lchkmem # set program check address
561 stg %r1,__LC_PGM_NEW_PSW+8
562 la %r1,1 # test in increments of 128KB
563 sllg %r1,%r1,17
564 larl %r3,memory_chunk
565 slgr %r4,%r4 # set start of chunk to zero
566 slgr %r5,%r5 # set end of chunk to zero
567 slr %r6,%r6 # set access code to zero
568 la %r10,MEMORY_CHUNKS # number of chunks
569.Lloop:
570 tprot 0(%r5),0 # test protection of first byte
571 ipm %r7
572 srl %r7,28
573 clr %r6,%r7 # compare cc with last access code
574 je .Lsame
575 j .Lchkmem
576.Lsame:
577 algr %r5,%r1 # add 128KB to end of chunk
578 # no need to check here,
579 brc 12,.Lloop # this is the same chunk
580.Lchkmem: # > 16EB or tprot got a program check
581 clgr %r4,%r5 # chunk size > 0?
582 je .Lchkloop
583 stg %r4,0(%r3) # store start address of chunk
584 lgr %r0,%r5
585 slgr %r0,%r4
586 stg %r0,8(%r3) # store size of chunk
587 st %r6,20(%r3) # store type of chunk
588 la %r3,24(%r3)
589 larl %r8,memory_size
590 stg %r5,0(%r8) # store memory size
591 ahi %r10,-1 # update chunk number
592.Lchkloop:
593 lr %r6,%r7 # set access code to last cc
594 # we got an exception or we're starting a new
595 # chunk , we must check if we should
596 # still try to find valid memory (if we detected
597 # the amount of available storage), and if we
598 # have chunks left
599 lghi %r4,1
600 sllg %r4,%r4,31
601 clgr %r5,%r4
602 je .Lhsaskip
603 xr %r0, %r0
604 clgr %r0, %r9 # did we detect memory?
605 je .Ldonemem # if not, leave
606 chi %r10, 0 # do we have chunks left?
607 je .Ldonemem
608.Lhsaskip:
609 algr %r5,%r1 # add 128KB to end of chunk
610 lgr %r4,%r5 # potential new chunk
611 clgr %r5,%r9 # should we go on?
612 jl .Lloop
613.Ldonemem:
614
615 larl %r12,machine_flags
616#
617# find out if we are running under VM
618#
619 stidp __LC_CPUID # store cpuid
620 tm __LC_CPUID,0xff # running under VM ?
621 bno 0f-.LPG1(%r13)
622 oi 7(%r12),1 # set VM flag
6230: lh %r0,__LC_CPUID+4 # get cpu version
624 chi %r0,0x7490 # running on a P/390 ?
625 bne 1f-.LPG1(%r13)
626 oi 7(%r12),4 # set P/390 flag
6271:
628
629#
630# find out if we have the MVPG instruction
631#
632 la %r1,0f-.LPG1(%r13) # set program check address
633 stg %r1,__LC_PGM_NEW_PSW+8
634 sgr %r0,%r0
635 lghi %r1,0
636 lghi %r2,0
637 mvpg %r1,%r2 # test MVPG instruction
638 oi 7(%r12),16 # set MVPG flag
6390:
640
641#
642# find out if the diag 0x44 works in 64 bit mode
643#
644 la %r1,0f-.LPG1(%r13) # set program check address
645 stg %r1,__LC_PGM_NEW_PSW+8
646 mvc __LC_DIAG44_OPCODE(8),.Lnop-.LPG1(%r13)
647 diag 0,0,0x44 # test diag 0x44
648 oi 7(%r12),32 # set diag44 flag
649 mvc __LC_DIAG44_OPCODE(8),.Ldiag44-.LPG1(%r13)
6500:
651
652#
653# find out if we have the IDTE instruction
654#
655 la %r1,0f-.LPG1(%r13) # set program check address
656 stg %r1,__LC_PGM_NEW_PSW+8
657 .long 0xb2b10000 # store facility list
658 tm 0xc8,0x08 # check bit for clearing-by-ASCE
659 bno 0f-.LPG1(%r13)
660 lhi %r1,2094
661 lhi %r2,0
662 .long 0xb98e2001
663 oi 7(%r12),0x80 # set IDTE flag
6640:
665
666 lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space,
667 # virtual and never return ...
668 .align 16
669.Lentry:.quad 0x0000000180000000,_stext
670.Lctl: .quad 0x04b50002 # cr0: various things
671 .quad 0 # cr1: primary space segment table
672 .quad .Lduct # cr2: dispatchable unit control table
673 .quad 0 # cr3: instruction authorization
674 .quad 0 # cr4: instruction authorization
675 .quad 0xffffffffffffffff # cr5: primary-aste origin
676 .quad 0 # cr6: I/O interrupts
677 .quad 0 # cr7: secondary space segment table
678 .quad 0 # cr8: access registers translation
679 .quad 0 # cr9: tracing off
680 .quad 0 # cr10: tracing off
681 .quad 0 # cr11: tracing off
682 .quad 0 # cr12: tracing off
683 .quad 0 # cr13: home space segment table
684 .quad 0xc0000000 # cr14: machine check handling off
685 .quad 0 # cr15: linkage stack operations
686.Lpcmsk:.quad 0x0000000180000000
687.L4malign:.quad 0xffffffffffc00000
688.Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
689.Lnop: .long 0x07000700
690.Ldiag44:.long 0x83000044
691
692 .org PARMAREA-64
693.Lduct: .long 0,0,0,0,0,0,0,0
694 .long 0,0,0,0,0,0,0,0
695
696#
697# params at 10400 (setup.h)
698#
699 .org PARMAREA
700 .global _pstart
701_pstart:
702 .quad 0 # IPL_DEVICE
703 .quad RAMDISK_ORIGIN # INITRD_START
704 .quad RAMDISK_SIZE # INITRD_SIZE
705
706 .org COMMAND_LINE
707 .byte "root=/dev/ram0 ro"
708 .byte 0
709 .org 0x11000
710.Lsccb:
711 .hword 0x1000 # length, one page
712 .byte 0x00,0x00,0x00
713 .byte 0x80 # variable response bit set
714.Lsccbr:
715 .hword 0x00 # response code
716.Lscpincr1:
717 .hword 0x00
718.Lscpa1:
719 .byte 0x00
720 .fill 89,1,0
721.Lscpa2:
722 .int 0x00
723.Lscpincr2:
724 .quad 0x00
725 .fill 3984,1,0
726 .org 0x12000
727 .global _pend
728_pend:
729
730#ifdef CONFIG_SHARED_KERNEL
731 .org 0x100000
732#endif
733
734#
735# startup-code, running in virtual mode
736#
737 .globl _stext
738_stext: basr %r13,0 # get base
739.LPG2:
740#
741# Setup stack
742#
743 larl %r15,init_thread_union
744 lg %r14,__TI_task(%r15) # cache current in lowcore
745 stg %r14,__LC_CURRENT
746 aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
747 stg %r15,__LC_KERNEL_STACK # set end of kernel stack
748 aghi %r15,-160
749 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
750
751# check control registers
752 stctg %c0,%c15,0(%r15)
753 oi 6(%r15),0x20 # enable sigp external interrupts
754 oi 4(%r15),0x10 # switch on low address proctection
755 lctlg %c0,%c15,0(%r15)
756
757#
758 lam 0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess
759 brasl %r14,start_kernel # go to C code
760#
761# We returned from start_kernel ?!? PANIK
762#
763 basr %r13,0
764 lpswe .Ldw-.(%r13) # load disabled wait psw
765#
766 .align 8
767.Ldw: .quad 0x0002000180000000,0x0000000000000000
768.Laregs: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
769
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 11:23:24 -0500