risc-v add irq stack

2019-10-06 16:52:48 +08:00
parent f666ae3131
commit 93ae1c96ca
4 changed files with 25 additions and 1 deletions
--- a/arch/risc-v/rv32i/gcc/port_s.S
+++ b/arch/risc-v/rv32i/gcc/port_s.S
@@ -320,12 +320,24 @@ rv32_exception_entry:
    csrr    t0,  mstatus
    sw      t0,  __reg_mstatus__OFFSET(sp)

+    // switch to irq stack
+    mv      t0, sp
+    la      t1, k_irq_stk_top
+    lw      sp, (t1)
+    andi    sp, sp, 0xFFFFFFF0
+    sw      t0, (sp)
+
+
    // get irq num and call irq handler
    li      t0,  SOC_MCAUSE_EXP_MASK
    csrr    a0,  mcause
    and     a0,  a0, t0
    call    cpu_irq_entry

+    // switch back to task stack
+    lw      t0, (sp)
+    mv      sp, t0
+
    la      t0,  k_curr_task
    la      t1,  k_next_task