| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * linux/arch/sh/boot/compressed/head.S |
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| 4 | * |
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| 5 | * Copyright (C) 1999 Stuart Menefy |
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| 6 | * Copyright (C) 2003 SUGIOKA Toshinobu |
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| 7 | */ |
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| 8 | |
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| 9 | .text |
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| 10 | |
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| 11 | #include <asm/page.h> |
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| 12 | |
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| 13 | .global startup |
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| 14 | startup: |
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| 15 | /* Load initial status register */ |
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| 16 | mov.l init_sr, r1 |
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| 17 | ldc r1, sr |
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| 18 | |
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| 19 | /* Move myself to proper location if necessary */ |
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| 20 | mova 1f, r0 |
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| 21 | mov.l 1f, r2 |
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| 22 | cmp/eq r2, r0 |
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| 23 | bt clear_bss |
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| 24 | sub r0, r2 |
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| 25 | mov.l bss_start_addr, r0 |
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| 26 | mov #0xffffffe0, r1 |
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| 27 | and r1, r0 ! align cache line |
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| 28 | mov.l text_start_addr, r3 |
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| 29 | mov r0, r1 |
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| 30 | sub r2, r1 |
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| 31 | 3: |
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| 32 | mov.l @r1, r4 |
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| 33 | mov.l @(4,r1), r5 |
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| 34 | mov.l @(8,r1), r6 |
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| 35 | mov.l @(12,r1), r7 |
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| 36 | mov.l @(16,r1), r8 |
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| 37 | mov.l @(20,r1), r9 |
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| 38 | mov.l @(24,r1), r10 |
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| 39 | mov.l @(28,r1), r11 |
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| 40 | mov.l r4, @r0 |
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| 41 | mov.l r5, @(4,r0) |
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| 42 | mov.l r6, @(8,r0) |
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| 43 | mov.l r7, @(12,r0) |
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| 44 | mov.l r8, @(16,r0) |
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| 45 | mov.l r9, @(20,r0) |
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| 46 | mov.l r10, @(24,r0) |
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| 47 | mov.l r11, @(28,r0) |
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| 48 | #ifdef CONFIG_CPU_SH4 |
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| 49 | ocbwb @r0 |
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| 50 | #endif |
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| 51 | cmp/hi r3, r0 |
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| 52 | add #-32, r0 |
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| 53 | bt/s 3b |
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| 54 | add #-32, r1 |
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| 55 | mov.l 2f, r0 |
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| 56 | jmp @r0 |
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| 57 | nop |
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| 58 | |
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| 59 | .align 2 |
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| 60 | 1: .long 1b |
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| 61 | 2: .long clear_bss |
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| 62 | text_start_addr: |
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| 63 | .long startup |
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| 64 | |
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| 65 | /* Clear BSS */ |
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| 66 | clear_bss: |
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| 67 | mov.l end_addr, r1 |
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| 68 | mov.l bss_start_addr, r2 |
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| 69 | mov #0, r0 |
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| 70 | l1: |
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| 71 | mov.l r0, @-r1 |
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| 72 | cmp/eq r1,r2 |
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| 73 | bf l1 |
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| 74 | |
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| 75 | /* Set the initial pointer. */ |
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| 76 | mov.l init_stack_addr, r0 |
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| 77 | mov.l @r0, r15 |
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| 78 | |
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| 79 | /* Decompress the kernel */ |
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| 80 | mov.l decompress_kernel_addr, r0 |
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| 81 | jsr @r0 |
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| 82 | nop |
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| 83 | |
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| 84 | /* Jump to the start of the decompressed kernel */ |
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| 85 | mov.l kernel_start_addr, r0 |
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| 86 | jmp @r0 |
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| 87 | nop |
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| 88 | |
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| 89 | .align 2 |
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| 90 | bss_start_addr: |
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| 91 | .long __bss_start |
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| 92 | end_addr: |
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| 93 | .long _end |
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| 94 | init_sr: |
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| 95 | .long 0x500000F0 /* Privileged mode, Bank=0, Block=1, IMASK=0xF */ |
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| 96 | kexec_magic: |
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| 97 | .long 0x400000F0 /* magic used by kexec to parse zImage format */ |
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| 98 | init_stack_addr: |
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| 99 | .long stack_start |
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| 100 | decompress_kernel_addr: |
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| 101 | .long decompress_kernel |
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| 102 | kernel_start_addr: |
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| 103 | #ifdef CONFIG_32BIT |
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| 104 | .long ___pa(_text+PAGE_SIZE) |
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| 105 | #else |
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| 106 | .long _text+PAGE_SIZE |
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| 107 | #endif |
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| 108 | |
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| 109 | .align 9 |
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| 110 | fake_headers_as_bzImage: |
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| 111 | .word 0 |
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| 112 | .ascii "HdrS" ! header signature |
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| 113 | .word 0x0202 ! header version number (>= 0x0105) |
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| 114 | ! or else old loadlin-1.5 will fail) |
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| 115 | .word 0 ! default_switch |
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| 116 | .word 0 ! SETUPSEG |
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| 117 | .word 0x1000 |
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| 118 | .word 0 ! pointing to kernel version string |
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| 119 | .byte 0 ! = 0, old one (LILO, Loadlin, |
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| 120 | ! 0xTV: T=0 for LILO |
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| 121 | ! V = version |
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| 122 | .byte 1 ! Load flags bzImage=1 |
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| 123 | .word 0x8000 ! size to move, when setup is not |
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| 124 | .long 0x100000 ! 0x100000 = default for big kernel |
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| 125 | .long 0 ! address of loaded ramdisk image |
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| 126 | .long 0 # its size in bytes |
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| 127 | |
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