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https://github.com/open-goal/jak-project.git
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93 lines
1.8 KiB
C++
93 lines
1.8 KiB
C++
/*!
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* @file dma.cpp
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* DMA Related functions for Overlord.
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* This code is not great.
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*/
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#include <cstring>
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#include <cstdio>
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#include "dma.h"
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#include "common/common_types.h"
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#include "game/sce/iop.h"
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using namespace iop;
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u32 dmaid; // ID of in-progress DMA. 0 if no DMA in progress
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sceSifDmaData cmd; // DMA settings
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u32 strobe; // ?? mysterious sound DMA flag.
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void dma_init_globals() {
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dmaid = 0;
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memset(&cmd, 0, sizeof(cmd));
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strobe = 0;
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}
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/*!
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* Wait for an ongoing DMA transfer to finish.
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* IOP DMAs are instant in this version, so we return immediately and clear dmaid.
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*/
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void DMA_Sync() {
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// The DMA is complete. Clear dmaid.
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dmaid = 0;
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// for fun, the original code
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// if(dmaid != 0) {
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// if(sceSifDmaStat(dmaid) > 0) {
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// u32 count = 10000;
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// while(sceSifDmaStat(dmaid) > 0) {
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// DelayThread(10);
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// count--;
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// if(count == 0) {
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// u32 count = 10000;
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// }
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// }
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// }
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//
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// // better do that again, just to be sure i did it the first time.
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// u32 count = 10000;
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// while(sceSifDmaStat(dmaid) > 0) {
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// DelayThread(10);
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// count--;
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// if(count == 0) {
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// u32 count = 10000;
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// }
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// }
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// dmaid = 0;
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// }
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}
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/*!
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* Start DMA transfer to the EE.
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*/
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void DMA_SendToEE(void* data, u32 size, void* dest) {
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// finish previous DMA
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DMA_Sync();
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// setup command
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cmd.mode = 0;
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cmd.data = data;
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cmd.addr = dest;
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cmd.size = size;
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// start DMA (with disabled interrupts)
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CpuDisableIntr();
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dmaid = sceSifSetDma(&cmd, 1);
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CpuEnableIntr();
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if (dmaid == 0) {
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do {
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printf("Got a bad DMA ID!\n"); // added
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} while (true);
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}
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}
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/*!
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* SPU DMA interrupt handler.
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*/
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u32 intr() {
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strobe = 1;
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return 0;
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}
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// TODO DMA_SendToSPUAndSync()
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