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126 lines
2.4 KiB
126 lines
2.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* linux/arch/sh/boot/compressed/head.S |
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* |
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* Copyright (C) 1999 Stuart Menefy |
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* Copyright (C) 2003 SUGIOKA Toshinobu |
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*/ |
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.text |
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#include <asm/page.h> |
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.global startup |
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startup: |
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/* Load initial status register */ |
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mov.l init_sr, r1 |
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ldc r1, sr |
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/* Move myself to proper location if necessary */ |
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mova 1f, r0 |
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mov.l 1f, r2 |
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cmp/eq r2, r0 |
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bt clear_bss |
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sub r0, r2 |
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mov.l bss_start_addr, r0 |
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mov #0xffffffe0, r1 |
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and r1, r0 ! align cache line |
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mov.l text_start_addr, r3 |
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mov r0, r1 |
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sub r2, r1 |
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3: |
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mov.l @r1, r4 |
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mov.l @(4,r1), r5 |
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mov.l @(8,r1), r6 |
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mov.l @(12,r1), r7 |
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mov.l @(16,r1), r8 |
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mov.l @(20,r1), r9 |
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mov.l @(24,r1), r10 |
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mov.l @(28,r1), r11 |
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mov.l r4, @r0 |
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mov.l r5, @(4,r0) |
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mov.l r6, @(8,r0) |
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mov.l r7, @(12,r0) |
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mov.l r8, @(16,r0) |
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mov.l r9, @(20,r0) |
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mov.l r10, @(24,r0) |
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mov.l r11, @(28,r0) |
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#ifdef CONFIG_CPU_SH4 |
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ocbwb @r0 |
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#endif |
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cmp/hi r3, r0 |
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add #-32, r0 |
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bt/s 3b |
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add #-32, r1 |
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mov.l 2f, r0 |
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jmp @r0 |
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nop |
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.align 2 |
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1: .long 1b |
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2: .long clear_bss |
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text_start_addr: |
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.long startup |
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/* Clear BSS */ |
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clear_bss: |
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mov.l end_addr, r1 |
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mov.l bss_start_addr, r2 |
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mov #0, r0 |
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l1: |
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mov.l r0, @-r1 |
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cmp/eq r1,r2 |
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bf l1 |
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/* Set the initial pointer. */ |
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mov.l init_stack_addr, r0 |
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mov.l @r0, r15 |
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/* Decompress the kernel */ |
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mov.l decompress_kernel_addr, r0 |
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jsr @r0 |
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nop |
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/* Jump to the start of the decompressed kernel */ |
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mov.l kernel_start_addr, r0 |
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jmp @r0 |
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nop |
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.align 2 |
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bss_start_addr: |
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.long __bss_start |
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end_addr: |
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.long _end |
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init_sr: |
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.long 0x500000F0 /* Privileged mode, Bank=0, Block=1, IMASK=0xF */ |
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kexec_magic: |
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.long 0x400000F0 /* magic used by kexec to parse zImage format */ |
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init_stack_addr: |
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.long stack_start |
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decompress_kernel_addr: |
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.long decompress_kernel |
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kernel_start_addr: |
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#ifdef CONFIG_32BIT |
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.long ___pa(_text+PAGE_SIZE) |
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#else |
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.long _text+PAGE_SIZE |
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#endif |
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.align 9 |
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fake_headers_as_bzImage: |
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.word 0 |
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.ascii "HdrS" ! header signature |
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.word 0x0202 ! header version number (>= 0x0105) |
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! or else old loadlin-1.5 will fail) |
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.word 0 ! default_switch |
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.word 0 ! SETUPSEG |
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.word 0x1000 |
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.word 0 ! pointing to kernel version string |
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.byte 0 ! = 0, old one (LILO, Loadlin, |
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! 0xTV: T=0 for LILO |
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! V = version |
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.byte 1 ! Load flags bzImage=1 |
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.word 0x8000 ! size to move, when setup is not |
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.long 0x100000 ! 0x100000 = default for big kernel |
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.long 0 ! address of loaded ramdisk image |
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.long 0 # its size in bytes
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