X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Pico%2Fcarthw%2Fsvp%2FMemory.c;h=8a8474a09496b554d8cb8d364ada67998a44e65f;hb=d274c33b6b4607f0bf2361610a1e53fd1dd04195;hp=0462d7fc9d825cc7d36fb7e2d3ee5f18f7e91fd6;hpb=f53f286a8b48d19c65e83f90d00aa47e8e87c889;p=picodrive.git

diff --git a/Pico/carthw/svp/Memory.c b/Pico/carthw/svp/Memory.c
index 0462d7f..8a8474a 100644
--- a/Pico/carthw/svp/Memory.c
+++ b/Pico/carthw/svp/Memory.c
@@ -1,16 +1,128 @@
+// 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 "../../PicoInt.h"
 
+#ifndef UTYPES_DEFINED
+typedef unsigned char  u8;
+typedef unsigned short u16;
+typedef unsigned int   u32;
+#define UTYPES_DEFINED
+#endif
+
+#define CLEAR_DETECT(pc_start,pc_end,text) \
+  if (d == 0 && SekPc >= pc_start && SekPc < pc_end) \
+  { \
+    if (!clearing_ram) \
+      elprintf(EL_SVP, text); \
+    clearing_ram = 1; \
+    return; \
+  }
+
 unsigned int PicoSVPRead16(unsigned int a, int realsize)
 {
   unsigned int d = 0;
+  static int a15004_looping = 0;
+
+  // dram: 300000-31ffff
+  if      ((a & 0xfe0000) == 0x300000)
+    d = *(u16 *)(svp->dram + (a&0x1fffe));
+
+  // "cell arrange" 1: 390000-39ffff
+  else if ((a & 0xff0000) == 0x390000) {
+    // this is rewritten 68k code
+    unsigned int a1 = a >> 1;
+    a1 = (a1 & 0x7001) | ((a1 & 0x3e) << 6) | ((a1 & 0xfc0) >> 5);
+    d = ((u16 *)svp->dram)[a1];
+  }
+
+  // "cell arrange" 2: 3a0000-3affff
+  else if ((a & 0xff0000) == 0x3a0000) {
+    // this is rewritten 68k code
+    unsigned int a1 = a >> 1;
+    a1 = (a1 & 0x7801) | ((a1 & 0x1e) << 6) | ((a1 & 0x7e0) >> 4);
+    d = ((u16 *)svp->dram)[a1];
+  }
+
+  // regs
+  else if ((a & 0xfffff0) == 0xa15000) {
+    switch (a & 0xf) {
+      case 0:
+      case 2:
+        d = svp->ssp1601.gr[SSP_XST].h;
+        break;
+
+      case 4:
+        d = svp->ssp1601.gr[SSP_PM0].h;
+        svp->ssp1601.gr[SSP_PM0].h &= ~1;
+        if (d&1) a15004_looping = 0;
+	break;
+    }
+  }
+  else
+    elprintf(EL_UIO|EL_SVP|EL_ANOMALY, "SVP FIXME: unhandled r%i: [%06x] %04x @%06x", realsize, a&0xffffff, d, SekPc);
 
-  elprintf(EL_UIO, "SVP r%i: [%06x] %04x @%06x", realsize, a&0xffffff, d, SekPc);
+  if (!a15004_looping)
+    elprintf(EL_SVP, "SVP r%i: [%06x] %04x @%06x", realsize, a&0xffffff, d, SekPc);
+
+  if (a == 0xa15004 && !(d&1)) {
+    if (!a15004_looping)
+      elprintf(EL_SVP, "SVP det TIGHT loop: a15004");
+    a15004_looping = 1;
+  }
+  else a15004_looping = 0;
+
+  //if (a == 0x30fe02 && d == 0)
+  //  elprintf(EL_ANOMALY, "SVP lag?");
 
   return d;
 }
 
 void PicoSVPWrite8(unsigned int a, unsigned int d, int realsize)
 {
-  elprintf(EL_UIO, "SVP w%i: %06x, %08x @%06x", realsize, a&0xffffff, d, SekPc);
+  elprintf(EL_UIO|EL_SVP|EL_ANOMALY, "!!! SVP w%i: [%06x], %08x @%06x", realsize, a&0xffffff, d, SekPc);
+}
+
+void PicoSVPWrite16(unsigned int a, unsigned int d, int realsize)
+{
+  static int clearing_ram = 0;
+
+  // DRAM
+  if      ((a & 0xfe0000) == 0x300000)
+    *(u16 *)(svp->dram + (a&0x1fffe)) = d;
+
+  // regs
+  else if ((a & 0xfffff0) == 0xa15000) {
+    if (a == 0xa15000 || a == 0xa15002) {
+      // just guessing here
+      svp->ssp1601.gr[SSP_XST].h = d;
+      svp->ssp1601.gr[SSP_PM0].h |= 2;
+      svp->ssp1601.emu_status &= ~SSP_WAIT_PM0;
+    }
+    //else if (a == 0xa15006) svp->ssp1601.gr[SSP_PM0].h = d | (d << 1);
+    // 0xa15006 probably has 'halt'
+  }
+
+
+  if (a == 0x30fe06 && d != 0)
+    svp->ssp1601.emu_status &= ~SSP_WAIT_30FE06;
+
+  if (a == 0x30fe08 && d != 0)
+    svp->ssp1601.emu_status &= ~SSP_WAIT_30FE08;
+
+  // debug: detect RAM clears..
+  CLEAR_DETECT(0x0221dc, 0x0221f0, "SVP RAM CLEAR (full) @ 0221C2");
+  CLEAR_DETECT(0x02204c, 0x022068, "SVP RAM CLEAR 300000-31ffbf (1) @ 022032");
+  CLEAR_DETECT(0x021900, 0x021ff0, "SVP RAM CLEAR 300000-305fff");
+  CLEAR_DETECT(0x0220b0, 0x0220cc, "SVP RAM CLEAR 300000-31ffbf (2) @ 022096");
+  clearing_ram = 0;
+
+  elprintf(EL_SVP, "SVP w%i: [%06x] %04x @%06x", realsize, a&0xffffff, d, SekPc);
 }