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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * linux/arch/sh/boot/compressed/head.S | |
4 | * | |
5 | * Copyright (C) 1999 Stuart Menefy | |
6 | * Copyright (C) 2003 SUGIOKA Toshinobu | |
7 | */ | |
8 | ||
9 | .text | |
10 | ||
e2dfb912 | 11 | #include <asm/page.h> |
1da177e4 LT |
12 | |
13 | .global startup | |
14 | startup: | |
15 | /* Load initial status register */ | |
16 | mov.l init_sr, r1 | |
17 | ldc r1, sr | |
18 | ||
19 | /* Move myself to proper location if necessary */ | |
20 | mova 1f, r0 | |
21 | mov.l 1f, r2 | |
22 | cmp/eq r2, r0 | |
23 | bt clear_bss | |
24 | sub r0, r2 | |
25 | mov.l bss_start_addr, r0 | |
fea966f7 | 26 | mov #0xffffffe0, r1 |
1da177e4 LT |
27 | and r1, r0 ! align cache line |
28 | mov.l text_start_addr, r3 | |
29 | mov r0, r1 | |
30 | sub r2, r1 | |
31 | 3: | |
32 | mov.l @r1, r4 | |
33 | mov.l @(4,r1), r5 | |
34 | mov.l @(8,r1), r6 | |
35 | mov.l @(12,r1), r7 | |
36 | mov.l @(16,r1), r8 | |
37 | mov.l @(20,r1), r9 | |
38 | mov.l @(24,r1), r10 | |
39 | mov.l @(28,r1), r11 | |
40 | mov.l r4, @r0 | |
41 | mov.l r5, @(4,r0) | |
42 | mov.l r6, @(8,r0) | |
43 | mov.l r7, @(12,r0) | |
44 | mov.l r8, @(16,r0) | |
45 | mov.l r9, @(20,r0) | |
46 | mov.l r10, @(24,r0) | |
47 | mov.l r11, @(28,r0) | |
48 | #ifdef CONFIG_CPU_SH4 | |
49 | ocbwb @r0 | |
50 | #endif | |
51 | cmp/hi r3, r0 | |
52 | add #-32, r0 | |
53 | bt/s 3b | |
54 | add #-32, r1 | |
55 | mov.l 2f, r0 | |
56 | jmp @r0 | |
57 | nop | |
58 | ||
59 | .align 2 | |
60 | 1: .long 1b | |
61 | 2: .long clear_bss | |
62 | text_start_addr: | |
63 | .long startup | |
64 | ||
65 | /* Clear BSS */ | |
66 | clear_bss: | |
67 | mov.l end_addr, r1 | |
68 | mov.l bss_start_addr, r2 | |
69 | mov #0, r0 | |
70 | l1: | |
71 | mov.l r0, @-r1 | |
72 | cmp/eq r1,r2 | |
73 | bf l1 | |
74 | ||
75 | /* Set the initial pointer. */ | |
76 | mov.l init_stack_addr, r0 | |
77 | mov.l @r0, r15 | |
78 | ||
79 | /* Decompress the kernel */ | |
80 | mov.l decompress_kernel_addr, r0 | |
81 | jsr @r0 | |
82 | nop | |
83 | ||
84 | /* Jump to the start of the decompressed kernel */ | |
85 | mov.l kernel_start_addr, r0 | |
86 | jmp @r0 | |
87 | nop | |
88 | ||
89 | .align 2 | |
90 | bss_start_addr: | |
91 | .long __bss_start | |
92 | end_addr: | |
93 | .long _end | |
94 | init_sr: | |
68a1aed7 MD |
95 | .long 0x500000F0 /* Privileged mode, Bank=0, Block=1, IMASK=0xF */ |
96 | kexec_magic: | |
97 | .long 0x400000F0 /* magic used by kexec to parse zImage format */ | |
1da177e4 LT |
98 | init_stack_addr: |
99 | .long stack_start | |
100 | decompress_kernel_addr: | |
101 | .long decompress_kernel | |
102 | kernel_start_addr: | |
b161313a MF |
103 | #ifdef CONFIG_32BIT |
104 | .long ___pa(_text+PAGE_SIZE) | |
105 | #else | |
e2dfb912 | 106 | .long _text+PAGE_SIZE |
b161313a | 107 | #endif |
1da177e4 LT |
108 | |
109 | .align 9 | |
110 | fake_headers_as_bzImage: | |
111 | .word 0 | |
112 | .ascii "HdrS" ! header signature | |
113 | .word 0x0202 ! header version number (>= 0x0105) | |
114 | ! or else old loadlin-1.5 will fail) | |
115 | .word 0 ! default_switch | |
116 | .word 0 ! SETUPSEG | |
117 | .word 0x1000 | |
118 | .word 0 ! pointing to kernel version string | |
119 | .byte 0 ! = 0, old one (LILO, Loadlin, | |
120 | ! 0xTV: T=0 for LILO | |
121 | ! V = version | |
122 | .byte 1 ! Load flags bzImage=1 | |
123 | .word 0x8000 ! size to move, when setup is not | |
124 | .long 0x100000 ! 0x100000 = default for big kernel | |
125 | .long 0 ! address of loaded ramdisk image | |
126 | .long 0 # its size in bytes |