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| author | Kimplul <kimi.h.kuparinen@gmail.com> | 2023-07-31 22:24:29 +0300 |
|---|---|---|
| committer | Kimplul <kimi.h.kuparinen@gmail.com> | 2023-07-31 22:24:29 +0300 |
| commit | 6ad1b899ed93f8bc110cdec7a722c8740f9f8d66 (patch) | |
| tree | 99fe36028ffc4583c59e77d03bea2ade7a6c5ace /arch/riscv64/kernel/entry.S | |
| parent | 3212707a9ab549119ad0ad6441a07fe774c99f3b (diff) | |
| download | kmi-6ad1b899ed93f8bc110cdec7a722c8740f9f8d66.tar.gz kmi-6ad1b899ed93f8bc110cdec7a722c8740f9f8d66.zip | |
start working on irqs
Diffstat (limited to 'arch/riscv64/kernel/entry.S')
| -rw-r--r-- | arch/riscv64/kernel/entry.S | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/arch/riscv64/kernel/entry.S b/arch/riscv64/kernel/entry.S index 9d4d951..698dae7 100644 --- a/arch/riscv64/kernel/entry.S +++ b/arch/riscv64/kernel/entry.S @@ -62,15 +62,18 @@ sr t4, offsetof_t4(sp) .endm -.global handle_irq -handle_irq: +.global handle_trap +handle_trap: csrrw tp, CSR_SSCRATCH, tp - bnez tp, continue_irq - /* the exception came from the kernel, should probably handle but for - * now just spin in place */ - 1: j 1b + bnez tp, continue_trap + /* the trap came from the kernel, should never happen so just panic + * and abort or whatever */ + csrr a0, CSR_SEPC + csrr a1, CSR_STVAL + csrr a2, CSR_SCAUSE + call kernel_panic -continue_irq: +continue_trap: sr sp, offsetof_tcbd(tp) lr sp, offsetof_regs(tp) addi sp, sp, -sizeof_registers @@ -88,12 +91,15 @@ continue_irq: /* load supervisor cause */ csrr t5, CSR_SCAUSE /* interrupts fall through, exceptions jump */ + /* (leading 1 means the value is interpreted as negative) */ bge t5, zero, handle_exception save_regs save_args - /* TODO: handle interrupts */ + mv t5, a0 + call riscv_handle_interrupt + j _load_context handle_exception: |