diff options
Diffstat (limited to 'sys/kern/entry.S')
| -rw-r--r-- | sys/kern/entry.S | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/sys/kern/entry.S b/sys/kern/entry.S new file mode 100644 index 0000000..5ad0490 --- /dev/null +++ b/sys/kern/entry.S @@ -0,0 +1,39 @@ +.section ".text.init" + +.globl _start +_start: + csrw satp, zero + csrw sie, zero + csrw sip, zero + + .option push + .option norelax + la gp, __global_pointer$ + .option pop + + la sp, __stack_start + li t1, PAGE_SIZE + mul t1, t1, a0 + add sp, sp, t1 + + li a2, 1 + lla a3, _boot_hart + amoswap.w a3, a2, (a3) + bnez a3, _spin + + la a2, __bss_start + la a3, __bss_end +1: + sd zero, (a2) + addi a2, a2, __SIZEOF_POINTER__ + blt a2, a3, 1b + + call init + + +_spin: + wfi + j _spin + +.section ".data" +_boot_hart: .word 0 |