Imagelibrary/mini-riscv-os
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simplify start.s

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ccckmit
2023-05-24 11:30:48 +08:00
parent 4b4df222e1
commit b69981d0e1
1 changed files with 5 additions and 15 deletions
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20
05-Preemptive/start.s
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@@ -3,24 +3,14 @@
.global _start
_start:
# setup stacks per hart
csrr t0, mhartid # read current hart id
slli t0, t0, 10 # shift left the hart id by 1024
la sp, stacks + STACK_SIZE # set the initial stack pointer
# to the end of the stack space
add sp, sp, t0 # move the current hart stack pointer
# to its place in the stack space
# park harts with id != 0
csrr a0, mhartid # read current hart id
bnez a0, park # if we're not on the hart 0
# we park the hart
j os_main # hart 0 jump to c
csrr a0, mhartid # 讀取核心代號
bnez a0, park # 若不是 0 號核心，跳到 park 停止
la sp, stacks + STACK_SIZE # 0 號核心設定堆疊
j os_main # 0 號核心跳到主程式 os_main
park:
wfi
j park
stacks:
.skip STACK_SIZE * 4 # allocate space for the harts stacks
.skip STACK_SIZE # 分配堆疊空間