103 lines
2.1 KiB
ArmAsm
103 lines
2.1 KiB
ArmAsm
#include "tl2cdr.h"
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.globl _prog_start
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.globl _rv32i_plic_handle
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.section .text.init, "ax", %progbits
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#if 0
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#其他代码全部使用RV32E编译，仅此代码采用 RV32I 编译，故而可以使用x0, x16~x31寄存器
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#为了方便，不再使用ABI中的别名，直接使用x0, x16~x31；x1~x15使用ABI中定义的别名
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#endif
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_prog_start:
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li x16, 0
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mv x17, a0 # plic_claim
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mv x18, a1 # flag_intTxEnd
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mv x19, a2 # flag_intRxError
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mv x20, a3 # flag_intRxStart
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mv x21, a4 # flag_intRxEnd
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mv x22, x0
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#lui x23, %hi(_rv32i_plic_handle)
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#lw x24, %lo(_rv32i_plic_handle)(x23)
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la x24, _rv32i_plic_handle
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li x25, 1
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li x26, 0
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li x27, 0
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li x28, CDR_INT_TXEND
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li x29, CDR_INT_RXERROR
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li x30, CDR_INT_RXSTART
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li x31, CDR_INT_RXEND
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mv a0, x24
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li x23, 0
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li x24, 0
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ret
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.balign 32
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_rv32i_plic_handle:
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#if 0 /*RV32的核心自动禁用中断，无需手动禁用*/
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csrr x16, mstatus # 读取 mstatus 寄存器
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andi x16, x16, ~(1 << 3) # 清除 MIE 位 (全局中断禁用)
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csrw mstatus, x16 # 写回 mstatus 寄存器
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#endif
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lw x23, 0(x17) # x23 = *plic_claim
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sw x23, 0(x17) # *plic_claim = x23
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#li x25, 1
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#if 0
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li x24, CDR_INT_TXEND
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bne x23, x24, 1f #_if (x23 != x24) goto 1f
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sw x25, 0(x18) #_else
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j 4f
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1:
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li x24, CDR_INT_RXERROR
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bne x23, x24, 2f #_if (x23 != x24) goto 2f
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sw x25, 0(x19) #_else
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j 4f
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2:
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li x24, CDR_INT_RXSTART
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bne x23, x24, 3f #_if (x23 != x24) goto 3f
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sw x25, 0(x20) #_else
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j 4f
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3:
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li x24, CDR_INT_RXEND
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bne x23, x24, 4f #_if (x23 != x24) goto 4f
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sw x25, 0(x21) #_else
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#else
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bne x23, x28, 1f #_if (x23 != x24) goto 1f
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sw x25, 0(x18) #_else
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j 4f
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1:
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bne x23, x29, 2f #_if (x23 != x24) goto 2f
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sw x25, 0(x19) #_else
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j 4f
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2:
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bne x23, x30, 3f #_if (x23 != x24) goto 3f
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sw x25, 0(x20) #_else
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j 4f
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3:
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bne x23, x31, 4f #_if (x23 != x24) goto 4f
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sw x25, 0(x21) #_else
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#endif
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4:
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#if 0 /*RV32的核心自动启动中断，无需手动启用*/
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csrr x16, mstatus
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ori x16, x16, 1<<3
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csrw mstatus, x16
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#endif
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mret
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