120 lines
2.2 KiB
ArmAsm
120 lines
2.2 KiB
ArmAsm
/*
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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 #0xe0, 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 0x400000F0 /* Privileged mode, Bank=0, Block=0, IMASK=0xF */
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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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.long _text+PAGE_SIZE
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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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