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review.evervolv.com / android_kernel_htc_msm8960 / af9deabeb0298559227fd9b481d33aefcb15ca54 / . / arch / m32r / boot / compressed / head.S
blob: 234d8b1e0ac1670a94fde74ebd4efdc5b60aa7f5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/*
2 * linux/arch/m32r/boot/compressed/head.S
3 *
4 * Copyright (c) 2001-2003 Hiroyuki Kondo, Hirokazu Takata,
5 * Hitoshi Yamamoto, Takeo Takahashi
6 * Copyright (c) 2004 Hirokazu Takata
7 */
8
9 .text
10#include <linux/config.h>
11#include <linux/linkage.h>
12#include <asm/addrspace.h>
13#include <asm/page.h>
14#include <asm/assembler.h>
15
16 /*
17 * This code can be loaded anywhere, as long as output will not
18 * overlap it.
19 *
20 * NOTE: This head.S should *NOT* be compiled with -fpic.
21 *
22 */
23
24 .global startup
25 .global __bss_start, _ebss, end, zimage_data, zimage_len
26 __ALIGN
27startup:
28 ldi r0, #0x0000 /* SPI, disable EI */
29 mvtc r0, psw
30
31 ldi r12, #-8
32 bl 1f
33 .fillinsn
341:
35 seth r1, #high(CONFIG_MEMORY_START + 0x00400000) /* Start address */
36 add r12, r14 /* Real address */
37 sub r12, r1 /* difference */
38
39 .global got_len
40 seth r3, #high(_GLOBAL_OFFSET_TABLE_+8)
41 or3 r3, r3, #low(_GLOBAL_OFFSET_TABLE_+12)
42 add r3, r14
43
44 /* Update the contents of global offset table */
45 ldi r1, #low(got_len)
46 srli r1, #2
47 beqz r1, 2f
48 .fillinsn
491:
50 ld r2, @r3
51 add r2, r12
52 st r2, @r3
53 addi r3, #4
54 addi r1, #-1
55 bnez r1, 1b
56 .fillinsn
572:
58 /* XXX: resolve plt */
59
60/*
61 * Clear BSS first so that there are no surprises...
62 */
63#ifdef CONFIG_ISA_DUAL_ISSUE
64 seth r2, #high(__bss_start)
65 or3 r2, r2, #low(__bss_start)
66 add r2, r12
67 seth r3, #high(_ebss)
68 or3 r3, r3, #low(_ebss)
69 add r3, r12
70 sub r3, r2
71
72 ; R4 = BSS size in longwords (rounded down)
73 mv r4, r3 || ldi r1, #0
74 srli r4, #4 || addi r2, #-4
75 beqz r4, .Lendloop1
76.Lloop1:
77#ifndef CONFIG_CHIP_M32310
78 ; Touch memory for the no-write-allocating cache.
79 ld r0, @(4,r2)
80#endif
81 st r1, @+r2 || addi r4, #-1
82 st r1, @+r2
83 st r1, @+r2
84 st r1, @+r2 || cmpeq r1, r4 ; R4 = 0?
85 bnc .Lloop1
86.Lendloop1:
87 and3 r4, r3, #15
88 addi r2, #4
89 beqz r4, .Lendloop2
90.Lloop2:
91 stb r1, @r2 || addi r4, #-1
92 addi r2, #1
93 bnez r4, .Lloop2
94.Lendloop2:
95
96#else /* not CONFIG_ISA_DUAL_ISSUE */
97 seth r2, #high(__bss_start)
98 or3 r2, r2, #low(__bss_start)
99 add r2, r12
100 seth r3, #high(_ebss)
101 or3 r3, r3, #low(_ebss)
102 add r3, r12
103 sub r3, r2
104 mv r4, r3
105 srli r4, #2 ; R4 = BSS size in longwords (rounded down)
106 ldi r1, #0 ; clear R1 for longwords store
107 addi r2, #-4 ; account for pre-inc store
108 beqz r4, .Lendloop1 ; any more to go?
109.Lloop1:
110 st r1, @+r2 ; yep, zero out another longword
111 addi r4, #-1 ; decrement count
112 bnez r4, .Lloop1 ; go do some more
113.Lendloop1:
114
115#endif /* not CONFIG_ISA_DUAL_ISSUE */
116
117 seth r1, #high(end)
118 or3 r1, r1, #low(end)
119 add r1, r12
120 mv sp, r1
121
122/*
123 * decompress the kernel
124 */
125 mv r0, sp
126 srli r0, 31 /* MMU is ON or OFF */
127 seth r1, #high(zimage_data)
128 or3 r1, r1, #low(zimage_data)
129 add r1, r12
130 seth r2, #high(zimage_len)
131 or3 r2, r2, #low(zimage_len)
132 mv r3, sp
133
134 bl decompress_kernel
135
136#if defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_VDEC2)
137 /* Cache flush */
138 ldi r0, -1
139 ldi r1, 0xd0 ; invalidate i-cache, copy back d-cache
140 stb r1, @r0
141#elif defined(CONFIG_CHIP_M32102)
142 /* Cache flush */
143 ldi r0, -2
144 ldi r1, 0x0100 ; invalidate
145 stb r1, @r0
Hirokazu Takata9287d952006-01-06 00:18:41 -0800[diff] [blame]146#elif defined(CONFIG_CHIP_M32104)
147 /* Cache flush */
148 ldi r0, -2
149 ldi r1, 0x0700 ; invalidate i-cache, copy back d-cache
150 sth r1, @r0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]151#else
152#error "put your cache flush function, please"
153#endif
154
155 mv r0, sp
156 srli r0, 31 /* MMU is ON or OFF */
157 slli r0, 31
158 or3 r0, r0, #0x2000
159 seth r1, #high(CONFIG_MEMORY_START)
160 or r0, r1
161 jmp r0
162
163 .balign 512
164fake_headers_as_bzImage:
165 .short 0
166 .ascii "HdrS"
167 .short 0x0202
168 .short 0
169 .short 0
170 .byte 0x00, 0x10
171 .short 0
172 .byte 0
173 .byte 1
174 .byte 0x00, 0x80
175 .long 0
176 .long 0
177