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irq context switch do not use flag variable anymore

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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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33
arch/risc-v/bumblebee/gcc/riscv_port_s.S
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@@ -5,7 +5,6 @@
.extern k_curr_task
.extern k_next_task
.extern k_task_irq_switch_flag
.align 2
irq_entry:
@@ -55,25 +54,33 @@ irq_entry:
csrr a0, mcause
mv a1, sp
slli a0, a0, 16
srli a0, a0, 16
// the bumblebee mstatus register is different
// name bit detail
// INTERRUPT 31 0: exception or nmi, 1 irq
// MINHV 30 reading irq vector table
// MPP 29:28 == mstatus.MPP
// MPIE 27 == mstatus.MPIE
// Reserved 26:24 0
// MPIL 23:16 previous interrupt level
// Reserved 15:12 0
// EXCCODE 11:0 exception code
slli a0, a0, 20
srli a0, a0, 20
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) // t2 = k_curr_task->sp
sw sp, (t2) // k_curr_task->sp = sp
// 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)
lw t1, (t1) // t1 = k_next_task
sw t1, (t0) // k_curr_task = k_next_task
// load new task sp
lw sp, (t1)