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retrieve firmware arguments

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2009-12-07 02:09:39 +01:00
parent a22078eb4f
commit d5b44e501d
2 changed files with 85 additions and 4 deletions
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2
include/grub/mips/kernel.h
View file

@ -25,7 +25,7 @@
#define GRUB_KERNEL_MACHINE_LINK_ALIGN 32
#define GRUB_KERNEL_CPU_RAW_SIZE 0x100
#define GRUB_KERNEL_CPU_RAW_SIZE 0x200
#define GRUB_KERNEL_CPU_COMPRESSED_SIZE 0x8
#define GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE 0xc
#define GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE 0x10

87
kern/mips/startup.S
View file

@ -31,6 +31,7 @@ __start:
_start:
start:
bal codestart
base:
. = _start + GRUB_KERNEL_CPU_COMPRESSED_SIZE
compressed_size:
.long 0
@ -41,8 +42,69 @@ total_module_size:
kernel_image_size:
.long 0
codestart:
/* Decompress the payload. */
/* Save our base. */
move $s0, $ra
/* Parse arguments. Has to be done before relocation.
So need to do it in asm. */
#ifdef GRUB_MACHINE_MIPS_YEELOONG
/* $a2 has the environment. */
move $t0, $a2
argcont:
lw $t1, 0($t0)
beq $t1, $zero, argdone
#define DO_PARSE(str, reg) \
addiu $t2, $s0, (str-base);\
bal parsestr;\
beq $v0, $zero, 1f;\
move reg, $v0;\
b 2f;\
1:
DO_PARSE (busclockstr, $s2)
DO_PARSE (cpuclockstr, $s3)
DO_PARSE (memsizestr, $s4)
DO_PARSE (highmemsizestr, $s5)
2:
addiu $t0, $t0, 4
b argcont
parsestr:
move $v0, $zero
move $t3, $t1
3:
lb $t4, 0($t2)
lb $t5, 0($t3)
addiu $t2, $t2, 1
addiu $t3, $t3, 1
beq $t5, $zero, 1f
beq $t5, $t4, 3b
bne $t4, $zero, 1f
addiu $t3, $t3, 0xffff
digcont:
lb $t5, 0($t3)
/* Substract '0' from digit. */
addiu $t5, $t5, 0xffd0
bltz $t5, 1f
addiu $t4, $t5, 0xfff7
bgtz $t4, 1f
/* Multiply $v0 by 10 with bitshifts. */
sll $v0, $v0, 1
sll $t4, $v0, 2
addu $v0, $v0, $t4
addu $v0, $v0, $t5
addiu $t3, $t3, 1
b digcont
1:
jr $ra
busclockstr: .asciiz "busclock="
cpuclockstr: .asciiz "cpuclock="
memsizestr: .asciiz "memsize="
highmemsizestr: .asciiz "highmemsize="
.p2align 2
argdone:
#endif
/* Decompress the payload. */
addiu $a0, $s0, GRUB_KERNEL_CPU_RAW_SIZE - BASE_ADDR
lui $a1, %hi(compressed)
addiu $a1, %lo(compressed)
@ -50,7 +112,8 @@ codestart:
move $s1, $a1
/* $a0 contains source compressed address, $a1 is destination,
$a2 is compressed size. FIXME: put LZMA here. Don't clober $s0, $s1.
$a2 is compressed size. FIXME: put LZMA here. Don't clober $s0,
$s1, $s2, $s3, $s4 and $s5.
On return $v0 contains uncompressed size.
*/
move $v0, $a2
@ -84,9 +147,27 @@ VARIABLE(grub_prefix)
*/
. = _start + GRUB_KERNEL_CPU_DATA_END
#ifdef GRUB_MACHINE_MIPS_YEELOONG
VARIABLE (grub_arch_busclock)
.long 0
VARIABLE (grub_arch_cpuclock)
.long 0
VARIABLE (grub_arch_memsize)
.long 0
VARIABLE (grub_arch_highmemsize)
.long 0
#endif
cont:
#ifdef GRUB_MACHINE_MIPS_YEELOONG
lui $t1, %hi(grub_arch_busclock)
addiu $t1, %lo(grub_arch_busclock)
sw $s2, 0($t1)
sw $s3, 4($t1)
sw $s4, 8($t1)
sw $s5, 12($t1)
#endif
/* Move the modules out of BSS. */
lui $t1, %hi(_start)
addiu $t1, %lo(_start)