138 lines
3.2 KiB
C++
138 lines
3.2 KiB
C++
#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include "Rsp.h"
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#include "RSP Registers.h"
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#include "memory.h"
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// #define RSP_SAFE_DMA // Unoptimized DMA transfers
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void SP_DMA_READ (void)
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{
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uint32_t i, j, Length, Skip, Count, End, addr;
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uint8_t *Dest, *Source;
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addr = (*RSPInfo.SP_DRAM_ADDR_REG) & 0x00FFFFFF;
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if (addr > 0x7FFFFF)
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{
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DisplayError("SP DMA READ\nSP_DRAM_ADDR_REG not in RDRAM space");
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return;
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}
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if ((*RSPInfo.SP_RD_LEN_REG & 0xFFF) + 1 + (*RSPInfo.SP_MEM_ADDR_REG & 0xFFF) > 0x1000)
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{
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DisplayError("SP DMA READ\nCould not fit copy in memory segment");
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return;
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}
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Length = ((*RSPInfo.SP_RD_LEN_REG & 0xFFF) | 7) + 1;
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Skip = (*RSPInfo.SP_RD_LEN_REG >> 20) + Length;
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Count = ((*RSPInfo.SP_RD_LEN_REG >> 12) & 0xFF) + 1;
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End = ((*RSPInfo.SP_MEM_ADDR_REG & 0x0FFF) & ~7) + (((Count - 1) * Skip) + Length);
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Dest = ((*RSPInfo.SP_MEM_ADDR_REG & 0x1000) != 0 ? RSPInfo.IMEM : RSPInfo.DMEM) + ((*RSPInfo.SP_MEM_ADDR_REG & 0x0FFF) & ~7);
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Source = RSPInfo.RDRAM + (addr & ~7);
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#if defined(RSP_SAFE_DMA)
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for (j = 0 ; j < Count; j++)
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{
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for (i = 0 ; i < Length; i++)
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{
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*(uint8_t *)(((size_t)Dest + j * Length + i) ^ 3) = *(uint8_t *)(((size_t)Source + j * Skip + i) ^ 3);
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}
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}
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#else
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if ((Skip & 0x3) == 0)
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{
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for (j = 0; j < Count; j++)
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{
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memcpy(Dest, Source, Length);
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Source += Skip;
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Dest += Length;
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}
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}
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else
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{
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for (j = 0 ; j < Count; j++)
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{
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for (i = 0 ; i < Length; i++)
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{
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*(uint8_t *)(((size_t)Dest + i) ^ 3) = *(uint8_t *)(((size_t)Source + i) ^ 3);
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}
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Source += Skip;
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Dest += Length;
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}
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}
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#endif
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// TODO: Could this be a problem DMEM to IMEM?
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if (CPUCore == RecompilerCPU && (*RSPInfo.SP_MEM_ADDR_REG & 0x1000) != 0)
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{
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SetJumpTable(End);
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}
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*RSPInfo.SP_DMA_BUSY_REG = 0;
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*RSPInfo.SP_STATUS_REG &= ~SP_STATUS_DMA_BUSY;
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}
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void SP_DMA_WRITE (void)
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{
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uint32_t i, j, Length, Skip, Count, addr;
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uint8_t *Dest, *Source;
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addr = (*RSPInfo.SP_DRAM_ADDR_REG) & 0x00FFFFFF;
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if (addr > 0x7FFFFF)
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{
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DisplayError("SP DMA WRITE\nSP_DRAM_ADDR_REG not in RDRAM space");
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return;
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}
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if ((*RSPInfo.SP_WR_LEN_REG & 0xFFF) + 1 + (*RSPInfo.SP_MEM_ADDR_REG & 0xFFF) > 0x1000)
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{
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DisplayError("SP DMA WRITE\nCould not fit copy in memory segment");
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return;
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}
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Length = ((*RSPInfo.SP_WR_LEN_REG & 0xFFF) | 7) + 1;
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Skip = (*RSPInfo.SP_WR_LEN_REG >> 20) + Length;
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Count = ((*RSPInfo.SP_WR_LEN_REG >> 12) & 0xFF) + 1;
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Dest = RSPInfo.RDRAM + (addr & ~7);
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Source = ((*RSPInfo.SP_MEM_ADDR_REG & 0x1000) != 0 ? RSPInfo.IMEM : RSPInfo.DMEM) + ((*RSPInfo.SP_MEM_ADDR_REG & 0xFFF) & ~7);
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#if defined(RSP_SAFE_DMA)
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for (j = 0 ; j < Count; j++)
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{
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for (i = 0 ; i < Length; i++)
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{
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*(uint8_t *)(((size_t)Dest + j * Skip + i) ^ 3) = *(uint8_t *)(((size_t)Source + j * Length + i) ^ 3);
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}
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}
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#else
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if ((Skip & 0x3) == 0)
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{
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for (j = 0; j < Count; j++)
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{
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memcpy(Dest, Source, Length);
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Source += Length;
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Dest += Skip;
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}
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}
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else
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{
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for (j = 0 ; j < Count; j++)
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{
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for (i = 0 ; i < Length; i++)
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{
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*(uint8_t *)(((size_t)Dest + i) ^ 3) = *(uint8_t *)(((size_t)Source + i) ^ 3);
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}
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Source += Length;
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Dest += Skip;
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}
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}
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#endif
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*RSPInfo.SP_DMA_BUSY_REG = 0;
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*RSPInfo.SP_STATUS_REG &= ~SP_STATUS_DMA_BUSY;
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}
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