eb001/tb/sw/src/mstStartup.S

#include "tl2cdr.h"

.extern main
.extern plic_handle
.extern int_svr_code
.extern plic_claim
.extern flag_intTxEnd
.extern flag_intRxError
.extern flag_intRxStart
.extern flag_intRxEnd

.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
#ifdef __RV32I_MARCH__
	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
#endif

	li sp, 0x40011000

	lui t0, %hi(plic_claim)
	lw a0, %lo(plic_claim)(t0)
	#la a0, plic_claim
	
	#lui t0, %hi(flag_intTxEnd)
	#lw a1, %lo(flag_intTxEnd)(t0)

	la a1, flag_intTxEnd
	
	#lui t0, %hi(flag_intRxError)
	#lw a2, %lo(flag_intRxError)(t0)
	la a2, flag_intRxError

	#lui t0, %hi(flag_intRxStart)
	#lw a3, %lo(flag_intRxStart)(t0)
	la a3, flag_intRxStart

	#lui t0, %hi(flag_intRxEnd)
	#lw a4, %lo(flag_intRxEnd)(t0)
	la a4, flag_intRxEnd
	
	call int_svr_code
	mv t0, a0					#这里选择不同的trap_entry服务函数,这个是RV32I的代码

	#la t0, trap_entry			#这个是最初版的trap_entry，仅做了RV32E的改造
	#la t0, opt_trap_entry		#这个是做了汇编优化的，也做了RV32E的改造
	csrw mtvec, t0
	li t0, 1 << 11
	csrw mie, t0

	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)
#ifdef __RV32I_MARCH__
	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)
#endif

#if 0
    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
#endif

	call plic_handle

#if 0
	csrr t0, mstatus
	ori t0, t0, 1<<3
	csrw mstatus, t0
#endif

	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)
#ifdef __RV32I_MARCH__
	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)
#endif
	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

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)

#if 0
    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
#endif

	lui	t1, %hi(plic_claim)		
	lw	t0, %lo(plic_claim)(t1)	# t0 = &plic_claim

	lw  t1, 0(t0)				# t1 = *plic_claim
	sw  t1, 0(t0)				# *plic_claim = t1

	li	s0, CDR_INT_TXEND		

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

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

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

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

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

3:
	li  s0, CDR_INT_RXEND
	bne t1, s0, 4f				#_if (t1 != s0) goto 4f

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

4:
#if 0
	csrr t0, mstatus
	ori t0, t0, 1<<3
	csrw mstatus, t0
#endif

	#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