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irq context switch do not use flag variable anymore

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This commit is contained in:
acevest
2019-10-05 18:23:15 +08:00
parent 2fdc9f600c
commit 44f0ac6579
4 changed files with 31 additions and 34 deletions
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22
arch/risc-v/spike/gcc/riscv_port_s.S
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@@ -1,4 +1,4 @@
.equ REGBYTES, 4
#include "port.h"
.align 2
.global rv32_trap_entry
@@ -53,25 +53,23 @@ rv32_trap_entry:
j irq_restore
handle_irq:
slli a0, a0, 16
srli a0, a0, 16
slli a0, a0, 1
srli a0, a0, 1
call cpu_irq_entry
la t0, k_task_irq_switch_flag
lw t1, (t0)
beqz t1, irq_restore
sw zero,(t0)
la t0, k_curr_task
la t1, k_next_task
beq t0, t1, irq_restore
// save sp to k_curr_task.sp
la t0, k_curr_task // t0 = &k_curr_task
lw t1, (t0)
sw sp, (t1)
lw t2, (t0)
sw sp, (t2)
// switch task
// k_curr_task = k_next_task
la t1, k_next_task // t1 = &k_next_task
lw t1, (t1) // t1 = k_next_task
sw t1, (t0)
sw t1, (t0) // k_curr_task = k_next_task
// load new task sp
lw sp, (t1)