mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
3d48ce7117
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@401 be3aeb3a-fb24-0410-a615-afba39da0efa
150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
// The SVP chip emulator
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// (c) Copyright 2008, Grazvydas "notaz" Ignotas
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// Free for non-commercial use.
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// For commercial use, separate licencing terms must be obtained.
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#include "../../PicoInt.h"
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#include "compiler.h"
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#ifdef __GP2X__
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#include <sys/mman.h>
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#endif
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svp_t *svp = NULL;
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int PicoSVPCycles = 850; // cycles/line, just a guess
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static int svp_dyn_ready = 0;
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/* save state stuff */
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typedef enum {
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CHUNK_IRAM = CHUNK_CARTHW,
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CHUNK_DRAM,
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CHUNK_SSP
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} chunk_name_e;
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static carthw_state_chunk svp_states[] =
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{
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{ CHUNK_IRAM, 0x800, NULL },
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{ CHUNK_DRAM, sizeof(svp->dram), NULL },
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{ CHUNK_SSP, sizeof(svp->ssp1601) - sizeof(svp->ssp1601.drc), NULL },
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{ 0, 0, NULL }
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};
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static void PicoSVPReset(void)
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{
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elprintf(EL_SVP, "SVP reset");
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memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
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ssp1601_reset(&svp->ssp1601);
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if ((PicoOpt&0x20000) && svp_dyn_ready)
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ssp1601_dyn_reset(&svp->ssp1601);
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}
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static void PicoSVPLine(int count)
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{
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if ((PicoOpt&0x20000) && svp_dyn_ready)
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ssp1601_dyn_run(PicoSVPCycles * count);
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else {
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ssp1601_run(PicoSVPCycles * count);
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svp_dyn_ready = 0; // just in case
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}
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// test mode
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//if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
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}
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static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
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{
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if (source < Pico.romsize) // Rom
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{
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source -= 2;
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*srcp = (unsigned short *)(Pico.rom + (source&~1));
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*limitp = (unsigned short *)(Pico.rom + Pico.romsize);
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return 1;
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}
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else if ((source & 0xfe0000) == 0x300000)
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{
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elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
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source &= 0x1fffe;
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source -= 2;
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*srcp = (unsigned short *)(svp->dram + source);
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*limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
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return 1;
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}
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else
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elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
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return 0;
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}
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void PicoSVPInit(void)
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{
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#ifdef __GP2X__
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int ret;
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ret = munmap(tcache, SSP_DRC_SIZE);
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printf("munmap tcache: %i\n", ret);
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#endif
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}
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static void PicoSVPShutdown(void)
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{
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#ifdef __GP2X__
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// also unmap tcache
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PicoSVPInit();
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#endif
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}
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void PicoSVPStartup(void)
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{
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void *tmp;
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elprintf(EL_SVP, "SVP init");
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tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
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if (tmp == NULL)
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{
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elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
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return;
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}
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//PicoOpt &= ~0x20000;
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Pico.rom = tmp;
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svp = (void *) ((char *)tmp + 0x200000);
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memset(svp, 0, sizeof(*svp));
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#ifdef __GP2X__
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tmp = mmap(tcache, SSP_DRC_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
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printf("mmap tcache: %p, asked %p\n", tmp, tcache);
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#endif
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// init SVP compiler
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svp_dyn_ready = 0;
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if (PicoOpt&0x20000) {
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if (ssp1601_dyn_startup()) return;
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svp_dyn_ready = 1;
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}
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// init ok, setup hooks..
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PicoRead16Hook = PicoSVPRead16;
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PicoWrite8Hook = PicoSVPWrite8;
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PicoWrite16Hook = PicoSVPWrite16;
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PicoDmaHook = PicoSVPDma;
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PicoResetHook = PicoSVPReset;
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PicoLineHook = PicoSVPLine;
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PicoCartUnloadHook = PicoSVPShutdown;
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// save state stuff
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svp_states[0].ptr = svp->iram_rom;
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svp_states[1].ptr = svp->dram;
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svp_states[2].ptr = &svp->ssp1601;
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carthw_chunks = svp_states;
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}
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