lowercasing filenames, part3

[picodrive.git] / pico / carthw / svp / memory.c

diff --git a/pico/carthw/svp/memory.c b/pico/carthw/svp/memory.c
new file mode 100644 (file)
index 0000000..7f182fe
--- /dev/null
+++ b/pico/carthw/svp/memory.c
@@ -0,0 +1,129 @@
+// The SVP chip emulator, mem I/O stuff
+
+// (c) Copyright 2008, Grazvydas "notaz" Ignotas
+// Free for non-commercial use.
+
+// For commercial use, separate licencing terms must be obtained.
+
+
+#include "../../pico_int.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);
+
+  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|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'
+  }
+  else
+    elprintf(EL_UIO|EL_SVP|EL_ANOMALY, "SVP FIXME: unhandled w%i: [%06x] %04x @%06x", realsize, a&0xffffff, d, SekPc);
+
+
+  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);
+}
+