xv6-65oo2/kernel/entry.S
2022-08-09 14:17:46 -04:00

22 lines
603 B
ArmAsm

# qemu -kernel loads the kernel at 0x80000000
# and causes each hart (i.e. CPU) to jump there.
# kernel.ld causes the following code to
# be placed at 0x80000000.
.section .text
.global _entry
_entry:
# set up a stack for C.
# stack0 is declared in start.c,
# with a 4096-byte stack per CPU.
# sp = stack0 + (hartid * 4096)
la sp, stack0
li a0, 1024*4
csrr a1, mhartid
addi a1, a1, 1
mul a0, a0, a1
add sp, sp, a0
# jump to start() in start.c
call start
spin:
j spin