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