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authorGuanXuetao <gxt@mprc.pku.edu.cn>2011-01-15 05:23:31 -0500
committerGuanXuetao <gxt@mprc.pku.edu.cn>2011-03-16 21:19:14 -0400
commit70fac51feaf2ca50c84e102e2a2699eb19ef24bd (patch)
treea4ca6efdd40b063a4dd7ccb587d15f0f0535653a /arch/unicore32/boot/compressed
parent96cf5185a95e0b304596fe19edcf8dfcd5c10699 (diff)
unicore32 additional architecture files: boot process
This patch implements booting process, including uncompression process. Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/unicore32/boot/compressed')
-rw-r--r--arch/unicore32/boot/compressed/Makefile68
-rw-r--r--arch/unicore32/boot/compressed/head.S204
-rw-r--r--arch/unicore32/boot/compressed/misc.c126
-rw-r--r--arch/unicore32/boot/compressed/piggy.S.in6
-rw-r--r--arch/unicore32/boot/compressed/vmlinux.lds.in61
5 files changed, 465 insertions, 0 deletions
diff --git a/arch/unicore32/boot/compressed/Makefile b/arch/unicore32/boot/compressed/Makefile
new file mode 100644
index 000000000000..95373428cb3d
--- /dev/null
+++ b/arch/unicore32/boot/compressed/Makefile
@@ -0,0 +1,68 @@
1#
2# linux/arch/unicore32/boot/compressed/Makefile
3#
4# create a compressed vmlinuz image from the original vmlinux
5#
6# This file is subject to the terms and conditions of the GNU General Public
7# License. See the file "COPYING" in the main directory of this archive
8# for more details.
9#
10# Copyright (C) 2001~2010 GUAN Xue-tao
11#
12
13EXTRA_CFLAGS := -fpic -fno-builtin
14EXTRA_AFLAGS := -Wa,-march=all
15
16OBJS := misc.o
17
18# font.c and font.o
19CFLAGS_font.o := -Dstatic=
20$(obj)/font.c: $(srctree)/drivers/video/console/font_8x8.c
21 $(call cmd,shipped)
22
23# piggy.S and piggy.o
24suffix_$(CONFIG_KERNEL_GZIP) := gzip
25suffix_$(CONFIG_KERNEL_BZIP2) := bz2
26suffix_$(CONFIG_KERNEL_LZO) := lzo
27suffix_$(CONFIG_KERNEL_LZMA) := lzma
28
29$(obj)/piggy.$(suffix_y): $(obj)/../Image FORCE
30 $(call if_changed,$(suffix_y))
31
32SEDFLAGS_piggy = s/DECOMP_SUFFIX/$(suffix_y)/
33$(obj)/piggy.S: $(obj)/piggy.S.in
34 @sed "$(SEDFLAGS_piggy)" < $< > $@
35
36$(obj)/piggy.o: $(obj)/piggy.$(suffix_y) $(obj)/piggy.S FORCE
37
38targets := vmlinux vmlinux.lds font.o font.c head.o misc.o \
39 piggy.$(suffix_y) piggy.o piggy.S \
40
41# Make sure files are removed during clean
42extra-y += piggy.gzip piggy.bz2 piggy.lzo piggy.lzma
43
44# ?
45LDFLAGS_vmlinux += -p
46# Report unresolved symbol references
47LDFLAGS_vmlinux += --no-undefined
48# Delete all temporary local symbols
49LDFLAGS_vmlinux += -X
50# Next argument is a linker script
51LDFLAGS_vmlinux += -T
52
53# For uidivmod
54$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/head.o $(obj)/piggy.o \
55 $(obj)/misc.o FORCE
56 $(call if_changed,ld)
57 @:
58
59# We now have a PIC decompressor implementation. Decompressors running
60# from RAM should not define ZTEXTADDR. Decompressors running directly
61# from ROM or Flash must define ZTEXTADDR (preferably via the config)
62ZTEXTADDR := 0
63ZBSSADDR := ALIGN(4)
64
65SEDFLAGS_lds = s/TEXT_START/$(ZTEXTADDR)/;s/BSS_START/$(ZBSSADDR)/
66$(obj)/vmlinux.lds: $(obj)/vmlinux.lds.in arch/unicore32/boot/Makefile $(KCONFIG_CONFIG)
67 @sed "$(SEDFLAGS_lds)" < $< > $@
68
diff --git a/arch/unicore32/boot/compressed/head.S b/arch/unicore32/boot/compressed/head.S
new file mode 100644
index 000000000000..fbd1e374c685
--- /dev/null
+++ b/arch/unicore32/boot/compressed/head.S
@@ -0,0 +1,204 @@
1/*
2 * linux/arch/unicore32/boot/compressed/head.S
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <linux/linkage.h>
13#include <mach/memory.h>
14
15#define csub cmpsub
16#define cand cmpand
17#define nop8 nop; nop; nop; nop; nop; nop; nop; nop
18
19 .section ".start", #alloc, #execinstr
20 .text
21start:
22 .type start,#function
23
24 /* Initialize ASR, PRIV mode and INTR off */
25 mov r0, #0xD3
26 mov.a asr, r0
27
28 adr r0, LC0
29 ldm (r1, r2, r3, r5, r6, r7, r8), [r0]+
30 ldw sp, [r0+], #28
31 sub.a r0, r0, r1 @ calculate the delta offset
32
33 /*
34 * if delta is zero, we are running at the address
35 * we were linked at.
36 */
37 beq not_relocated
38
39 /*
40 * We're running at a different address. We need to fix
41 * up various pointers:
42 * r5 - zImage base address (_start)
43 * r7 - GOT start
44 * r8 - GOT end
45 */
46 add r5, r5, r0
47 add r7, r7, r0
48 add r8, r8, r0
49
50 /*
51 * we need to fix up pointers into the BSS region.
52 * r2 - BSS start
53 * r3 - BSS end
54 * sp - stack pointer
55 */
56 add r2, r2, r0
57 add r3, r3, r0
58 add sp, sp, r0
59
60 /*
61 * Relocate all entries in the GOT table.
62 * This fixes up the C references.
63 * r7 - GOT start
64 * r8 - GOT end
65 */
661001: ldw r1, [r7+], #0
67 add r1, r1, r0
68 stw.w r1, [r7]+, #4
69 csub.a r7, r8
70 bub 1001b
71
72not_relocated:
73 /*
74 * Clear BSS region.
75 * r2 - BSS start
76 * r3 - BSS end
77 */
78 mov r0, #0
791002: stw.w r0, [r2]+, #4
80 csub.a r2, r3
81 bub 1002b
82
83 /*
84 * Turn on the cache.
85 */
86 mov r0, #0
87 movc p0.c5, r0, #28 @ cache invalidate all
88 nop8
89 movc p0.c6, r0, #6 @ tlb invalidate all
90 nop8
91
92 mov r0, #0x1c @ en icache and wb dcache
93 movc p0.c1, r0, #0
94 nop8
95
96 /*
97 * Set up some pointers, for starting decompressing.
98 */
99
100 mov r1, sp @ malloc space above stack
101 add r2, sp, #0x10000 @ 64k max
102
103 /*
104 * Check to see if we will overwrite ourselves.
105 * r4 = final kernel address
106 * r5 = start of this image
107 * r6 = size of decompressed image
108 * r2 = end of malloc space (and therefore this image)
109 * We basically want:
110 * r4 >= r2 -> OK
111 * r4 + image length <= r5 -> OK
112 */
113 ldw r4, =KERNEL_IMAGE_START
114 csub.a r4, r2
115 bea wont_overwrite
116 add r0, r4, r6
117 csub.a r0, r5
118 beb wont_overwrite
119
120 /*
121 * If overwrite, just print error message
122 */
123 b __error_overwrite
124
125 /*
126 * We're not in danger of overwriting ourselves.
127 * Do this the simple way.
128 */
129wont_overwrite:
130 /*
131 * decompress_kernel:
132 * r0: output_start
133 * r1: free_mem_ptr_p
134 * r2: free_mem_ptr_end_p
135 */
136 mov r0, r4
137 b.l decompress_kernel @ C functions
138
139 /*
140 * Clean and flush the cache to maintain consistency.
141 */
142 mov r0, #0
143 movc p0.c5, r0, #14 @ flush dcache
144 nop8
145 movc p0.c5, r0, #20 @ icache invalidate all
146 nop8
147
148 /*
149 * Turn off the Cache and MMU.
150 */
151 mov r0, #0 @ disable i/d cache and MMU
152 movc p0.c1, r0, #0
153 nop8
154
155 mov r0, #0 @ must be zero
156 ldw r4, =KERNEL_IMAGE_START
157 mov pc, r4 @ call kernel
158
159
160 .align 2
161 .type LC0, #object
162LC0: .word LC0 @ r1
163 .word __bss_start @ r2
164 .word _end @ r3
165 .word _start @ r5
166 .word _image_size @ r6
167 .word _got_start @ r7
168 .word _got_end @ r8
169 .word decompress_stack_end @ sp
170 .size LC0, . - LC0
171
172print_string:
173#ifdef CONFIG_DEBUG_OCD
1742001: ldb.w r1, [r0]+, #1
175 csub.a r1, #0
176 bne 2002f
177 mov pc, lr
1782002:
179 movc r2, p1.c0, #0
180 cand.a r2, #2
181 bne 2002b
182 movc p1.c1, r1, #1
183 csub.a r1, #'\n'
184 cmoveq r1, #'\r'
185 beq 2002b
186 b 2001b
187#else
188 mov pc, lr
189#endif
190
191__error_overwrite:
192 adr r0, str_error
193 b.l print_string
1942001: nop8
195 b 2001b
196str_error: .asciz "\nError: Kernel address OVERWRITE\n"
197 .align
198
199 .ltorg
200
201 .align 4
202 .section ".stack", "aw", %nobits
203decompress_stack: .space 4096
204decompress_stack_end:
diff --git a/arch/unicore32/boot/compressed/misc.c b/arch/unicore32/boot/compressed/misc.c
new file mode 100644
index 000000000000..176d5bda3559
--- /dev/null
+++ b/arch/unicore32/boot/compressed/misc.c
@@ -0,0 +1,126 @@
1/*
2 * linux/arch/unicore32/boot/compressed/misc.c
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <asm/unaligned.h>
14#include <mach/uncompress.h>
15
16/*
17 * gzip delarations
18 */
19unsigned char *output_data;
20unsigned long output_ptr;
21
22unsigned int free_mem_ptr;
23unsigned int free_mem_end_ptr;
24
25#define STATIC static
26#define STATIC_RW_DATA /* non-static please */
27
28/*
29 * arch-dependent implementations
30 */
31#ifndef ARCH_HAVE_DECOMP_ERROR
32#define arch_decomp_error(x)
33#endif
34
35#ifndef ARCH_HAVE_DECOMP_SETUP
36#define arch_decomp_setup()
37#endif
38
39#ifndef ARCH_HAVE_DECOMP_PUTS
40#define arch_decomp_puts(p)
41#endif
42
43void *memcpy(void *dest, const void *src, size_t n)
44{
45 int i = 0;
46 unsigned char *d = (unsigned char *)dest, *s = (unsigned char *)src;
47
48 for (i = n >> 3; i > 0; i--) {
49 *d++ = *s++;
50 *d++ = *s++;
51 *d++ = *s++;
52 *d++ = *s++;
53 *d++ = *s++;
54 *d++ = *s++;
55 *d++ = *s++;
56 *d++ = *s++;
57 }
58
59 if (n & 1 << 2) {
60 *d++ = *s++;
61 *d++ = *s++;
62 *d++ = *s++;
63 *d++ = *s++;
64 }
65
66 if (n & 1 << 1) {
67 *d++ = *s++;
68 *d++ = *s++;
69 }
70
71 if (n & 1)
72 *d++ = *s++;
73
74 return dest;
75}
76
77void error(char *x)
78{
79 arch_decomp_puts("\n\n");
80 arch_decomp_puts(x);
81 arch_decomp_puts("\n\n -- System halted");
82
83 arch_decomp_error(x);
84
85 for (;;)
86 ; /* Halt */
87}
88
89/* Heap size should be adjusted for different decompress method */
90#ifdef CONFIG_KERNEL_GZIP
91#include "../../../../lib/decompress_inflate.c"
92#endif
93
94#ifdef CONFIG_KERNEL_BZIP2
95#include "../../../../lib/decompress_bunzip2.c"
96#endif
97
98#ifdef CONFIG_KERNEL_LZO
99#include "../../../../lib/decompress_unlzo.c"
100#endif
101
102#ifdef CONFIG_KERNEL_LZMA
103#include "../../../../lib/decompress_unlzma.c"
104#endif
105
106unsigned long decompress_kernel(unsigned long output_start,
107 unsigned long free_mem_ptr_p,
108 unsigned long free_mem_ptr_end_p)
109{
110 unsigned char *tmp;
111
112 output_data = (unsigned char *)output_start;
113 free_mem_ptr = free_mem_ptr_p;
114 free_mem_end_ptr = free_mem_ptr_end_p;
115
116 arch_decomp_setup();
117
118 tmp = (unsigned char *) (((unsigned long)input_data_end) - 4);
119 output_ptr = get_unaligned_le32(tmp);
120
121 arch_decomp_puts("Uncompressing Linux...");
122 decompress(input_data, input_data_end - input_data, NULL, NULL,
123 output_data, NULL, error);
124 arch_decomp_puts(" done, booting the kernel.\n");
125 return output_ptr;
126}
diff --git a/arch/unicore32/boot/compressed/piggy.S.in b/arch/unicore32/boot/compressed/piggy.S.in
new file mode 100644
index 000000000000..b79704d58026
--- /dev/null
+++ b/arch/unicore32/boot/compressed/piggy.S.in
@@ -0,0 +1,6 @@
1 .section .piggydata,#alloc
2 .globl input_data
3input_data:
4 .incbin "arch/unicore32/boot/compressed/piggy.DECOMP_SUFFIX"
5 .globl input_data_end
6input_data_end:
diff --git a/arch/unicore32/boot/compressed/vmlinux.lds.in b/arch/unicore32/boot/compressed/vmlinux.lds.in
new file mode 100644
index 000000000000..d5a3ce296239
--- /dev/null
+++ b/arch/unicore32/boot/compressed/vmlinux.lds.in
@@ -0,0 +1,61 @@
1/*
2 * linux/arch/unicore/boot/compressed/vmlinux.lds.in
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12OUTPUT_ARCH(unicore32)
13ENTRY(_start)
14SECTIONS
15{
16 /DISCARD/ : {
17 /*
18 * Discard any r/w data - this produces a link error if we have any,
19 * which is required for PIC decompression. Local data generates
20 * GOTOFF relocations, which prevents it being relocated independently
21 * of the text/got segments.
22 */
23 *(.data)
24 }
25
26 . = TEXT_START;
27 _text = .;
28
29 .text : {
30 _start = .;
31 *(.start)
32 *(.text)
33 *(.text.*)
34 *(.fixup)
35 *(.gnu.warning)
36 *(.rodata)
37 *(.rodata.*)
38 *(.piggydata)
39 . = ALIGN(4);
40 }
41
42 _etext = .;
43
44 /* Assume size of decompressed image is 4x the compressed image */
45 _image_size = (_etext - _text) * 4;
46
47 _got_start = .;
48 .got : { *(.got) }
49 _got_end = .;
50 .got.plt : { *(.got.plt) }
51 _edata = .;
52
53 . = BSS_START;
54 __bss_start = .;
55 .bss : { *(.bss) }
56 _end = .;
57
58 .stack : { *(.stack) }
59 .comment 0 : { *(.comment) }
60}
61
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-13 22:42:23 -0400