eb001/tb/sw/src/mstStartup.S

#include "tl2cdr.h"

.extern main
.extern plic_handle
.globl _prog_start
.section .text.init


_prog_start:
	li x1,  0
	li x2,  0
	li x3,  0
	li x4,  0
	li x5,  0
	li x6,  0
	li x7,  0
	li x8,  0
	li x9,  0
	li x10, 0
	li x11, 0
	li x12, 0
	li x13, 0
	li x14, 0
	li x15, 0
	li x16, 0
	li x17, 0
	li x18, 0
	li x19, 0
	li x20, 0
	li x21, 0
	li x22, 0
	li x23, 0
	li x24, 0
	li x25, 0
	li x26, 0
	li x27, 0
	li x28, 0
	li x29, 0
	li x30, 0
	li x31, 0

	#la t0, trap_entry
	la t0, opt_trap_entry
	csrw mtvec, t0
	li t0, 1 << 11
	csrw mie, t0

	li sp, 0x40011000

	csrr t0, mstatus
	ori t0, t0, 1<<3
	csrw mstatus, t0

	call main

	ecall



.balign 32
.section .trap_entry, "ax", %progbits
trap_entry:

	addi	sp,sp,-136
	sw	ra,4(sp)
	sw	sp,8(sp)
	sw	gp,12(sp)
	sw	tp,16(sp)
	sw	t0,20(sp)
	sw	t1,24(sp)
	sw	t2,28(sp)
	sw	s0,32(sp)
	sw	s1,36(sp)
	sw	a0,40(sp)
	sw	a1,44(sp)
	sw	a2,48(sp)
	sw	a3,52(sp)
	sw	a4,56(sp)
	sw	a5,60(sp)
	sw	a6,64(sp)
	sw	a7,68(sp)
	sw	s2,72(sp)
	sw	s3,76(sp)
	sw	s4,80(sp)
	sw	s5,84(sp)
	sw	s6,88(sp)
	sw	s7,92(sp)
	sw	s8,96(sp)
	sw	s9,100(sp)
	sw	s10,104(sp)
	sw	s11,108(sp)
	sw	t3,112(sp)
	sw	t4,116(sp)
	sw	t5,120(sp)
	sw	t6,124(sp)

    csrr t0, mstatus            # 读取 mstatus 寄存器
    andi t0, t0, ~(1 << 3)      # 清除 MIE 位 (全局中断禁用)
    csrw mstatus, t0            # 写回 mstatus 寄存器

	call plic_handle

	csrr t0, mstatus
	ori t0, t0, 1<<3
	csrw mstatus, t0

	lw	ra,4(sp)
	lw	sp,8(sp)
	lw	gp,12(sp)
	lw	tp,16(sp)
	lw	t0,20(sp)
	lw	t1,24(sp)
	lw	t2,28(sp)
	lw	s0,32(sp)
	lw	s1,36(sp)
	lw	a0,40(sp)
	lw	a1,44(sp)
	lw	a2,48(sp)
	lw	a3,52(sp)
	lw	a4,56(sp)
	lw	a5,60(sp)
	lw	a6,64(sp)
	lw	a7,68(sp)
	lw	s2,72(sp)
	lw	s3,76(sp)
	lw	s4,80(sp)
	lw	s5,84(sp)
	lw	s6,88(sp)
	lw	s7,92(sp)
	lw	s8,96(sp)
	lw	s9,100(sp)
	lw	s10,104(sp)
	lw	s11,108(sp)
	lw	t3,112(sp)
	lw	t4,116(sp)
	lw	t5,120(sp)
	lw	t6,124(sp)
	addi	sp,sp,136



	mret

#.macro define_const name, value
#    .equ \name, \value
#.endm
## 使用宏定义常量
#define_const CDR_INT_TXEND, 	14


.extern plic_claim
.extern flag_intTxEnd
.extern flag_intRxError
.extern flag_intRxStart
.extern flag_intRxEnd

opt_trap_entry:

	addi	sp,sp,-136

	#sw	ra,4(sp)
	#sw	sp,8(sp)
	#sw	gp,12(sp)
	#sw	tp,16(sp)

	sw	t0,20(sp)
	sw	t1,24(sp)
	#sw	t2,28(sp)
	sw	s0,32(sp)
	sw	s1,36(sp)

	#sw	a0,40(sp)
	#sw	a1,44(sp)
	#sw	a2,48(sp)
	#sw	a3,52(sp)
	#sw	a4,56(sp)
	#sw	a5,60(sp)
	#sw	a6,64(sp)
	#sw	a7,68(sp)
	#sw	s2,72(sp)
	#sw	s3,76(sp)
	#sw	s4,80(sp)
	#sw	s5,84(sp)
	#sw	s6,88(sp)
	#sw	s7,92(sp)
	#sw	s8,96(sp)
	#sw	s9,100(sp)
	#sw	s10,104(sp)
	#sw	s11,108(sp)
	#sw	t3,112(sp)
	#sw	t4,116(sp)
	#sw	t5,120(sp)
	#sw	t6,124(sp)

    csrr t0, mstatus            # 读取 mstatus 寄存器
    andi t0, t0, ~(1 << 3)      # 清除 MIE 位 (全局中断禁用)
    csrw mstatus, t0            # 写回 mstatus 寄存器

# t0 = &plic_claim
	lui	t1, %hi(plic_claim)		
	lw	t0, %lo(plic_claim)(t1)
	
# t1 = *plic_claim
	lw  t1, 0(t0)
	li	s0, CDR_INT_TXEND		

#_if (t1 != s0) goto 1f	
	bne t1, s0, 1f

#_else
	lui	s0,%hi(flag_intTxEnd)
	li	s1,1
	sw	s1,%lo(flag_intTxEnd)(s0)
	j 4f

1:
	li  s0, CDR_INT_RXERROR
#_if (t1 != s0) goto 2f
	bne t1, s0, 2f

#_else
	lui	s0,%hi(flag_intRxError)
	li	s1,1
	sw	s1,%lo(flag_intRxError)(s0)
	j 4f
2:
	li  s0, CDR_INT_RXSTART
#_if (t1 != s0) goto 3f
	bne t1, s0, 3f

#_else
	lui	s0,%hi(flag_intRxStart)
	li	s1,1
	sw	s1,%lo(flag_intRxStart)(s0)
	j 4f

3:
	li  s0, CDR_INT_RXEND

#_if (t1 != s0) goto 4f
	beq t1, s0, 4f

#_else
	lui	s0,%hi(flag_intRxEnd)
	li	s1,1
	sw	s1,%lo(flag_intRxEnd)(s0)

4:
	sw  t1, 0(t0)

	csrr t0, mstatus
	ori t0, t0, 1<<3
	csrw mstatus, t0

	#lw	ra,4(sp)
	#lw	sp,8(sp)
	#lw	gp,12(sp)
	#lw	tp,16(sp)
	
	lw	t0,20(sp)
	lw	t1,24(sp)
	#lw	t2,28(sp)
	lw	s0,32(sp)
	lw	s1,36(sp)

	#lw	a0,40(sp)
	#lw	a1,44(sp)
	#lw	a2,48(sp)
	#lw	a3,52(sp)
	#lw	a4,56(sp)
	#lw	a5,60(sp)
	#lw	a6,64(sp)
	#lw	a7,68(sp)
	#lw	s2,72(sp)
	#lw	s3,76(sp)
	#lw	s4,80(sp)
	#lw	s5,84(sp)
	#lw	s6,88(sp)
	#lw	s7,92(sp)
	#lw	s8,96(sp)
	#lw	s9,100(sp)
	#lw	s10,104(sp)
	#lw	s11,108(sp)
	#lw	t3,112(sp)
	#lw	t4,116(sp)
	#lw	t5,120(sp)
	#lw	t6,124(sp)

	addi	sp,sp,136

	mret