6ab3d5624e
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
176 lines
3.5 KiB
ArmAsm
176 lines
3.5 KiB
ArmAsm
/*
|
|
* linux/arch/m32r/boot/compressed/head.S
|
|
*
|
|
* Copyright (c) 2001-2003 Hiroyuki Kondo, Hirokazu Takata,
|
|
* Hitoshi Yamamoto, Takeo Takahashi
|
|
* Copyright (c) 2004 Hirokazu Takata
|
|
*/
|
|
|
|
.text
|
|
#include <linux/linkage.h>
|
|
#include <asm/addrspace.h>
|
|
#include <asm/page.h>
|
|
#include <asm/assembler.h>
|
|
|
|
/*
|
|
* This code can be loaded anywhere, as long as output will not
|
|
* overlap it.
|
|
*
|
|
* NOTE: This head.S should *NOT* be compiled with -fpic.
|
|
*
|
|
*/
|
|
|
|
.global startup
|
|
.global __bss_start, _ebss, end, zimage_data, zimage_len
|
|
__ALIGN
|
|
startup:
|
|
ldi r0, #0x0000 /* SPI, disable EI */
|
|
mvtc r0, psw
|
|
|
|
ldi r12, #-8
|
|
bl 1f
|
|
.fillinsn
|
|
1:
|
|
seth r1, #high(CONFIG_MEMORY_START + 0x00400000) /* Start address */
|
|
add r12, r14 /* Real address */
|
|
sub r12, r1 /* difference */
|
|
|
|
.global got_len
|
|
seth r3, #high(_GLOBAL_OFFSET_TABLE_+8)
|
|
or3 r3, r3, #low(_GLOBAL_OFFSET_TABLE_+12)
|
|
add r3, r14
|
|
|
|
/* Update the contents of global offset table */
|
|
ldi r1, #low(got_len)
|
|
srli r1, #2
|
|
beqz r1, 2f
|
|
.fillinsn
|
|
1:
|
|
ld r2, @r3
|
|
add r2, r12
|
|
st r2, @r3
|
|
addi r3, #4
|
|
addi r1, #-1
|
|
bnez r1, 1b
|
|
.fillinsn
|
|
2:
|
|
/* XXX: resolve plt */
|
|
|
|
/*
|
|
* Clear BSS first so that there are no surprises...
|
|
*/
|
|
#ifdef CONFIG_ISA_DUAL_ISSUE
|
|
seth r2, #high(__bss_start)
|
|
or3 r2, r2, #low(__bss_start)
|
|
add r2, r12
|
|
seth r3, #high(_ebss)
|
|
or3 r3, r3, #low(_ebss)
|
|
add r3, r12
|
|
sub r3, r2
|
|
|
|
; R4 = BSS size in longwords (rounded down)
|
|
mv r4, r3 || ldi r1, #0
|
|
srli r4, #4 || addi r2, #-4
|
|
beqz r4, .Lendloop1
|
|
.Lloop1:
|
|
#ifndef CONFIG_CHIP_M32310
|
|
; Touch memory for the no-write-allocating cache.
|
|
ld r0, @(4,r2)
|
|
#endif
|
|
st r1, @+r2 || addi r4, #-1
|
|
st r1, @+r2
|
|
st r1, @+r2
|
|
st r1, @+r2 || cmpeq r1, r4 ; R4 = 0?
|
|
bnc .Lloop1
|
|
.Lendloop1:
|
|
and3 r4, r3, #15
|
|
addi r2, #4
|
|
beqz r4, .Lendloop2
|
|
.Lloop2:
|
|
stb r1, @r2 || addi r4, #-1
|
|
addi r2, #1
|
|
bnez r4, .Lloop2
|
|
.Lendloop2:
|
|
|
|
#else /* not CONFIG_ISA_DUAL_ISSUE */
|
|
seth r2, #high(__bss_start)
|
|
or3 r2, r2, #low(__bss_start)
|
|
add r2, r12
|
|
seth r3, #high(_ebss)
|
|
or3 r3, r3, #low(_ebss)
|
|
add r3, r12
|
|
sub r3, r2
|
|
mv r4, r3
|
|
srli r4, #2 ; R4 = BSS size in longwords (rounded down)
|
|
ldi r1, #0 ; clear R1 for longwords store
|
|
addi r2, #-4 ; account for pre-inc store
|
|
beqz r4, .Lendloop1 ; any more to go?
|
|
.Lloop1:
|
|
st r1, @+r2 ; yep, zero out another longword
|
|
addi r4, #-1 ; decrement count
|
|
bnez r4, .Lloop1 ; go do some more
|
|
.Lendloop1:
|
|
|
|
#endif /* not CONFIG_ISA_DUAL_ISSUE */
|
|
|
|
seth r1, #high(end)
|
|
or3 r1, r1, #low(end)
|
|
add r1, r12
|
|
mv sp, r1
|
|
|
|
/*
|
|
* decompress the kernel
|
|
*/
|
|
mv r0, sp
|
|
srli r0, 31 /* MMU is ON or OFF */
|
|
seth r1, #high(zimage_data)
|
|
or3 r1, r1, #low(zimage_data)
|
|
add r1, r12
|
|
seth r2, #high(zimage_len)
|
|
or3 r2, r2, #low(zimage_len)
|
|
mv r3, sp
|
|
|
|
bl decompress_kernel
|
|
|
|
#if defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_VDEC2)
|
|
/* Cache flush */
|
|
ldi r0, -1
|
|
ldi r1, 0xd0 ; invalidate i-cache, copy back d-cache
|
|
stb r1, @r0
|
|
#elif defined(CONFIG_CHIP_M32102)
|
|
/* Cache flush */
|
|
ldi r0, -2
|
|
ldi r1, 0x0100 ; invalidate
|
|
stb r1, @r0
|
|
#elif defined(CONFIG_CHIP_M32104)
|
|
/* Cache flush */
|
|
ldi r0, -2
|
|
ldi r1, 0x0700 ; invalidate i-cache, copy back d-cache
|
|
sth r1, @r0
|
|
#else
|
|
#error "put your cache flush function, please"
|
|
#endif
|
|
|
|
mv r0, sp
|
|
srli r0, 31 /* MMU is ON or OFF */
|
|
slli r0, 31
|
|
or3 r0, r0, #0x2000
|
|
seth r1, #high(CONFIG_MEMORY_START)
|
|
or r0, r1
|
|
jmp r0
|
|
|
|
.balign 512
|
|
fake_headers_as_bzImage:
|
|
.short 0
|
|
.ascii "HdrS"
|
|
.short 0x0202
|
|
.short 0
|
|
.short 0
|
|
.byte 0x00, 0x10
|
|
.short 0
|
|
.byte 0
|
|
.byte 1
|
|
.byte 0x00, 0x80
|
|
.long 0
|
|
.long 0
|
|
|