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new image format for mips. Asm part

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phcoder 2009-10-18 14:10:31 +02:00
parent 8adc0f0060
commit ad17a401d6
5 changed files with 94 additions and 25 deletions
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98
kern/mips/startup.S
View file

@ -21,6 +21,8 @@
#include <grub/cpu/kernel.h>
#include <grub/machine/memory.h>
#define BASE_ADDR 8
.extern __bss_start
.extern _end
@ -28,8 +30,84 @@
__start:
_start:
start:
b codestart
. = _start + GRUB_KERNEL_CPU_PREFIX
bal codestart
. = _start + GRUB_KERNEL_CPU_COMPRESSED_SIZE
compressed_size:
.long 0
. = _start + GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE
total_module_size:
.long 0
. = _start + GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE
kernel_image_size:
.long 0
codestart:
/* Decompress the payload. */
addiu $t2, $ra, GRUB_KERNEL_CPU_RAW_SIZE - BASE_ADDR
lui $t1, %hi(compressed)
addiu $t1, %lo(compressed)
lw $t3, (GRUB_KERNEL_CPU_COMPRESSED_SIZE - BASE_ADDR)($ra)
/* $t2 contains source compressed address, $t1 is destination,
$t3 is compressed size. FIXME: put LZMA here. Don't clober $ra
*/
reloccont:
lb $t4, 0($t2)
sb $t4, 0($t1)
addiu $t1,$t1,1
addiu $t2,$t2,1
addiu $t3, 0xffff
bne $t3, $0, reloccont
/* Move the modules out of BSS. */
lui $t1, %hi(compressed)
addiu $t1, %lo(compressed)
lw $t2, (GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE - BASE_ADDR)($ra)
addu $t2, $t1, $t2
lui $t1, %hi(_end)
addiu $t1, %lo(_end)
addiu $t1, (GRUB_MOD_ALIGN-1)
li $t3, (GRUB_MOD_ALIGN-1)
nor $t3, $t3, $0
and $t1, $t1, $t3
/* Pass modules address as first argument. */
move $a0, $t1
lw $t3, (GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE - BASE_ADDR)($ra)
/* $t2 is source. $t1 is destination. $t3 is size. */
modulesmovcont:
lb $t4, 0($t2)
sb $t4, 0($t1)
addiu $t1,$t1,1
addiu $t2,$t2,1
addiu $t3, 0xffff
bne $t3, $0, modulesmovcont
/* Clean BSS. */
lui $t1, %hi(__bss_start)
addiu $t1, %lo(__bss_start)
lui $t2, %hi(_end)
addiu $t2, %lo(_end)
bsscont:
sb $0,0($t1)
addiu $t1,$t1,1
sltu $t3,$t1,$t2
bne $t3, $0, bsscont
li $sp, GRUB_MACHINE_MEMORY_STACK_HIGH
lui $t1, %hi(grub_main)
addiu $t1, %lo(grub_main)
#if __mips >= 2
sync
#endif
jr $t1
. = _start + GRUB_KERNEL_CPU_RAW_SIZE
compressed:
. = _start + GRUB_KERNEL_CPU_RAW_SIZE + GRUB_KERNEL_CPU_PREFIX
VARIABLE(grub_prefix)
/* to be filled by grub-mkelfimage */
@ -38,18 +116,4 @@ VARIABLE(grub_prefix)
* Leave some breathing room for the prefix.
*/
. = _start + GRUB_KERNEL_CPU_DATA_END
codestart:
lui $t1, %hi(__bss_start)
addiu $t1, %lo(__bss_start)
lui $t2, %hi(_end)
addiu $t2, %lo(_end)
bsscont:
sb $0,0($t1)
addiu $t1,$t1,1
sltu $t3,$t1,$t2
bne $3, $0, bsscont
li $sp, GRUB_MACHINE_MEMORY_STACK_HIGH
b grub_main
. = _start + GRUB_KERNEL_CPU_RAW_SIZE + GRUB_KERNEL_CPU_DATA_END