SVP save support

[picodrive.git] / Pico / carthw / svp / svp.c

diff --git a/Pico/carthw/svp/svp.c b/Pico/carthw/svp/svp.c
index a5de987..a29893b 100644 (file)
--- a/Pico/carthw/svp/svp.c
+++ b/Pico/carthw/svp/svp.c
@@ -1,7 +1,105 @@
+// 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"
 
+svp_t *svp = NULL;
+int PicoSVPCycles = 1000; // cycles/line
+
+/* 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),  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);
+}
+
+
+static void PicoSVPLine(int count)
+{
+       // ???
+       ssp1601_run(PicoSVPCycles * count);
+
+       // 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)
 {
-  elprintf(0xffff, "SVP");
+       void *tmp;
+
+       elprintf(EL_SVP, "SVP init");
+
+       tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
+       if (tmp == NULL)
+       {
+               elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
+               return;
+       }
+
+       Pico.rom = tmp;
+       svp = (void *) ((char *)tmp + 0x200000);
+       memset(svp, 0, sizeof(*svp));
+
+       // init ok, setup hooks..
+       PicoRead16Hook = PicoSVPRead16;
+       PicoWrite8Hook = PicoSVPWrite8;
+       PicoWrite16Hook = PicoSVPWrite16;
+       PicoDmaHook = PicoSVPDma;
+       PicoResetHook = PicoSVPReset;
+       PicoLineHook = PicoSVPLine;
+
+       // 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;
 }