mirror of
git://projects.qi-hardware.com/iris.git
synced 2024-11-05 08:37:30 +02:00
46 lines
733 B
ArmAsm
46 lines
733 B
ArmAsm
|
// The kernel stack.
|
||
|
|
.lcomm kernel_stack, KERNEL_STACK_SIZE
|
||
|
|
|
||
|
|
.globl __start
|
||
|
|
.set noreorder
|
||
|
|
|
||
|
|
#define Status 12
|
||
|
|
#define Config 16
|
||
|
|
|
||
|
|
__start:
|
||
|
|
bal 1f
|
||
|
|
nop
|
||
|
|
.word _gp
|
||
|
|
// For some reason the disassembler considers everything
|
||
|
|
// after __start non-code until the next label. So I add a label.
|
||
|
|
start_hack_for_disassembler:
|
||
|
|
1: lw $gp, 0($ra)
|
||
|
|
|
||
|
|
la $sp, kernel_stack + KERNEL_STACK_SIZE
|
||
|
|
|
||
|
|
// Disable interrupts during bootstrap.
|
||
|
|
mtc0 $zero, $Status
|
||
|
|
|
||
|
|
// TODO: flush cache and optionally refill it.
|
||
|
|
|
||
|
|
// Set kseg0 cachable.
|
||
|
|
li $k0, 0x3
|
||
|
|
mtc0 $k0, $Config, 0
|
||
|
|
|
||
|
|
// Jump into cached code.
|
||
|
|
la $t9, 1f
|
||
|
|
jr $t9
|
||
|
|
nop
|
||
|
|
1:
|
||
|
|
|
||
|
|
// Clear .bss
|
||
|
|
la $a0, _edata
|
||
|
|
la $a1, _end
|
||
|
|
1: sw $zero, 0($a0)
|
||
|
|
bne $a1, $a0, 1b
|
||
|
|
addu $a0, 4
|
||
|
|
|
||
|
|
la $t9, init
|
||
|
|
jr $t9
|
||
|
|
nop
|