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 bc7cddb..a29893b 100644 (file)
--- a/Pico/carthw/svp/svp.c
+++ b/Pico/carthw/svp/svp.c
@@ -1,7 +1,31 @@
+// 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 = 800; // cycles/line
+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)
 {
@@ -15,8 +39,6 @@ static void PicoSVPReset(void)
 static void PicoSVPLine(int count)
 {
        // ???
-       // OSC_NTSC / 3.0 / 60.0 / 262.0 ~= 1139
-       // OSC_PAL  / 3.0 / 50.0 / 312.0 ~= 1137
        ssp1601_run(PicoSVPCycles * count);
 
        // test mode
@@ -26,7 +48,14 @@ static void PicoSVPLine(int count)
 
 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;
@@ -66,5 +95,11 @@ void PicoSVPInit(void)
        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;
 }