diff options
Diffstat (limited to 'boot.S')
| -rw-r--r-- | boot.S | 18 |
1 files changed, 8 insertions, 10 deletions
@@ -7,26 +7,24 @@ // r2 -> 0x00000100 - start of ATAGS // preserve these registers as argument for kernel_main -.globl _boot // make entry point label global +.global _boot // make entry point label global _boot: - // Shut off extra cores - mrc p15, 0, r5, c0, c0, 5 - and r5, r5, #3 - cmp r5, #0 + // 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 + // go to system mode (we had problems doing this later) cps #0b11111 isb - // Setup the stack. - // It shall be directly below our kernel image - ldr r5, =__start - mov sp, r5 + // Initialize the stack (_stack_top is defined in linker.ld) + ldr sp, =_stack_top // Call kernel_main ldr r3, =kernel_main |