+// 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 "../../PicoInt.h"
+#include "compiler.h"
+#ifdef __GP2X__
+#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)
{
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)
{
- // ???
- // OSC_NTSC / 3.0 / 60.0 / 262.0 ~= 1139
- // OSC_PAL / 3.0 / 50.0 / 312.0 ~= 1137
- ssp1601_run(800);
+ 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 & 0xfe0000) == 0x300000)
+ 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;
void PicoSVPInit(void)
+{
+#ifdef __GP2X__
+ int ret;
+ ret = munmap(tcache, SSP_DRC_SIZE);
+ printf("munmap tcache: %i\n", ret);
+#endif
+}
+
+
+static void PicoSVPShutdown(void)
+{
+#ifdef __GP2X__
+ // also unmap tcache
+ PicoSVPInit();
+#endif
+}
+
+
+void PicoSVPStartup(void)
{
void *tmp;
return;
}
+ //PicoOpt &= ~0x20000;
Pico.rom = tmp;
svp = (void *) ((char *)tmp + 0x200000);
memset(svp, 0, sizeof(*svp));
+#ifdef __GP2X__
+ 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..
PicoRead16Hook = PicoSVPRead16;
PicoWrite8Hook = PicoSVPWrite8;
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;
}
+