+// 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 "../../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'
+ }
+ 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);
}