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// armv7 mode
// Entry point for the kernel.
// r15 -> should begin execution at 0x8000.
// r0 -> 0x00000000
// r1 -> 0x00000C42
// r2 -> 0x00000100 - start of ATAGS
// preserve these registers as argument for kernel_main
.global _boot // make entry point label global
_boot:
// Only let the first core execute
mrc p15, 0, r3, c0, c0, 5
and r3, r3, #3
cmp r3, #0
beq proceed
// this is a kind of blef - races can theoretically still occur
// when the main core overwrites this part of memory
wfe
proceed:
// go to system mode (we had problems doing this later)
cps #0b11111
isb
// Initialize the stack (_stack_top is defined in linker.ld)
ldr sp, =_stack_top
// Call kernel_main
ldr r3, =kernel_main
bx r3
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