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2fcd517c78
We use %ld to print mcause.code to compatilbe with rv64 and it do no harm for rv32. Signed-off-by: Wang Chen <wangchen20@iscas.ac.cn>
90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
#include "os.h"
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extern void trap_vector(void);
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extern void uart_isr(void);
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extern void timer_handler(void);
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extern void schedule(void);
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void trap_init()
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{
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/*
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* set the trap-vector base-address for machine-mode
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*/
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w_mtvec((reg_t)trap_vector);
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}
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void external_interrupt_handler()
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{
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int irq = plic_claim();
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if (irq == UART0_IRQ){
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uart_isr();
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} else if (irq) {
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printf("unexpected interrupt irq = %d\n", irq);
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}
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if (irq) {
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plic_complete(irq);
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}
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}
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reg_t trap_handler(reg_t epc, reg_t cause)
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{
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reg_t return_pc = epc;
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reg_t cause_code = cause & MCAUSE_MASK_ECODE;
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if (cause & MCAUSE_MASK_INTERRUPT) {
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/* Asynchronous trap - interrupt */
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switch (cause_code) {
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case 3:
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uart_puts("software interruption!\n");
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/*
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* acknowledge the software interrupt by clearing
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* the MSIP bit in mip.
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*/
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int id = r_mhartid();
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*(uint32_t*)CLINT_MSIP(id) = 0;
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schedule();
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break;
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case 7:
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uart_puts("timer interruption!\n");
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timer_handler();
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break;
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case 11:
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uart_puts("external interruption!\n");
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external_interrupt_handler();
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break;
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default:
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printf("Unknown async exception! Code = %ld\n", cause_code);
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break;
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}
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} else {
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/* Synchronous trap - exception */
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printf("Sync exceptions! Code = %ld\n", cause_code);
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panic("OOPS! What can I do!");
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//return_pc += 4;
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}
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return return_pc;
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}
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void trap_test()
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{
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/*
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* Synchronous exception code = 7
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* Store/AMO access fault
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*/
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*(int *)0x00000000 = 100;
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/*
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* Synchronous exception code = 5
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* Load access fault
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*/
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//int a = *(int *)0x00000000;
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uart_puts("Yeah! I'm return back from trap!\n");
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}
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