xv6-65oo2/kernel/entry.S

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