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- // The SVP chip emulator
- // (c) Copyright 2008, Grazvydas "notaz" Ignotas
- // Free for non-commercial use.
- // For commercial use, separate licencing terms must be obtained.
- #include "../../pico_int.h"
- #include "compiler.h"
- #if defined(__linux__) && defined(ARM)
- #include <sys/mman.h>
- #endif
- svp_t *svp = NULL;
- int PicoSVPCycles = 850; // cycles/line, just a guess
- static int svp_dyn_ready = 0;
- /* save state stuff */
- typedef enum {
- CHUNK_IRAM = CHUNK_CARTHW,
- CHUNK_DRAM,
- CHUNK_SSP
- } chunk_name_e;
- static carthw_state_chunk svp_states[] =
- {
- { CHUNK_IRAM, 0x800, NULL },
- { CHUNK_DRAM, sizeof(svp->dram), NULL },
- { CHUNK_SSP, sizeof(svp->ssp1601) - sizeof(svp->ssp1601.drc), NULL },
- { 0, 0, NULL }
- };
- static void PicoSVPReset(void)
- {
- elprintf(EL_SVP, "SVP reset");
- memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
- ssp1601_reset(&svp->ssp1601);
- #ifndef PSP
- if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready)
- ssp1601_dyn_reset(&svp->ssp1601);
- #endif
- }
- static void PicoSVPLine(void)
- {
- int count = 1;
- #if defined(ARM) || defined(PSP)
- // performance hack
- static int delay_lines = 0;
- delay_lines++;
- if ((Pico.m.scanline&0xf) != 0xf && Pico.m.scanline != 261 && Pico.m.scanline != 311)
- return;
- count = delay_lines;
- delay_lines = 0;
- #endif
- #ifndef PSP
- if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready)
- ssp1601_dyn_run(PicoSVPCycles * count);
- else
- #endif
- {
- ssp1601_run(PicoSVPCycles * count);
- svp_dyn_ready = 0; // just in case
- }
- // test mode
- //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
- }
- static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
- {
- if (source < Pico.romsize) // Rom
- {
- source -= 2;
- *srcp = (unsigned short *)(Pico.rom + (source&~1));
- *limitp = (unsigned short *)(Pico.rom + Pico.romsize);
- return 1;
- }
- else if ((source & 0xfe0000) == 0x300000)
- {
- elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
- source &= 0x1fffe;
- source -= 2;
- *srcp = (unsigned short *)(svp->dram + source);
- *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
- return 1;
- }
- else
- elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
- return 0;
- }
- void PicoSVPInit(void)
- {
- #if defined(__linux__) && defined(ARM)
- int ret;
- ret = munmap(tcache, SSP_DRC_SIZE);
- printf("munmap tcache: %i\n", ret);
- #endif
- }
- static void PicoSVPShutdown(void)
- {
- #if defined(__linux__) && defined(ARM)
- // also unmap tcache
- PicoSVPInit();
- #endif
- }
- void PicoSVPStartup(void)
- {
- void *tmp;
- elprintf(EL_STATUS, "SVP startup");
- tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
- if (tmp == NULL)
- {
- elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
- return;
- }
- //PicoOpt &= ~0x20000;
- Pico.rom = tmp;
- svp = (void *) ((char *)tmp + 0x200000);
- memset(svp, 0, sizeof(*svp));
- #if defined(__linux__) && defined(ARM)
- tmp = mmap(tcache, SSP_DRC_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
- printf("mmap tcache: %p, asked %p\n", tmp, tcache);
- #endif
- // init SVP compiler
- svp_dyn_ready = 0;
- #ifndef PSP
- if (PicoOpt&POPT_EN_SVP_DRC) {
- if (ssp1601_dyn_startup()) return;
- svp_dyn_ready = 1;
- }
- #endif
- // init ok, setup hooks..
- PicoCartMemSetup = PicoSVPMemSetup;
- PicoDmaHook = PicoSVPDma;
- PicoResetHook = PicoSVPReset;
- PicoLineHook = PicoSVPLine;
- PicoCartUnloadHook = PicoSVPShutdown;
- // save state stuff
- svp_states[0].ptr = svp->iram_rom;
- svp_states[1].ptr = svp->dram;
- svp_states[2].ptr = &svp->ssp1601;
- carthw_chunks = svp_states;
- PicoAHW |= PAHW_SVP;
- }
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