mirror of
https://github.com/RaySollium99/picodrive.git
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efcba75f8a
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@574 be3aeb3a-fb24-0410-a615-afba39da0efa
129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
// The SVP chip emulator, mem I/O stuff
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// (c) Copyright 2008, Grazvydas "notaz" Ignotas
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// Free for non-commercial use.
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// For commercial use, separate licencing terms must be obtained.
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#include "../../pico_int.h"
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#ifndef UTYPES_DEFINED
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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#define UTYPES_DEFINED
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#endif
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#define CLEAR_DETECT(pc_start,pc_end,text) \
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if (d == 0 && SekPc >= pc_start && SekPc < pc_end) \
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{ \
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if (!clearing_ram) \
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elprintf(EL_SVP, text); \
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clearing_ram = 1; \
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return; \
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}
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unsigned int PicoSVPRead16(unsigned int a, int realsize)
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{
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unsigned int d = 0;
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static int a15004_looping = 0;
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// dram: 300000-31ffff
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if ((a & 0xfe0000) == 0x300000)
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d = *(u16 *)(svp->dram + (a&0x1fffe));
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// "cell arrange" 1: 390000-39ffff
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else if ((a & 0xff0000) == 0x390000) {
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// this is rewritten 68k code
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unsigned int a1 = a >> 1;
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a1 = (a1 & 0x7001) | ((a1 & 0x3e) << 6) | ((a1 & 0xfc0) >> 5);
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d = ((u16 *)svp->dram)[a1];
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}
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// "cell arrange" 2: 3a0000-3affff
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else if ((a & 0xff0000) == 0x3a0000) {
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// this is rewritten 68k code
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unsigned int a1 = a >> 1;
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a1 = (a1 & 0x7801) | ((a1 & 0x1e) << 6) | ((a1 & 0x7e0) >> 4);
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d = ((u16 *)svp->dram)[a1];
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}
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// regs
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else if ((a & 0xfffff0) == 0xa15000) {
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switch (a & 0xf) {
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case 0:
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case 2:
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d = svp->ssp1601.gr[SSP_XST].h;
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break;
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case 4:
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d = svp->ssp1601.gr[SSP_PM0].h;
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svp->ssp1601.gr[SSP_PM0].h &= ~1;
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if (d&1) a15004_looping = 0;
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break;
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}
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}
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else
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elprintf(EL_UIO|EL_SVP|EL_ANOMALY, "SVP FIXME: unhandled r%i: [%06x] %04x @%06x", realsize, a&0xffffff, d, SekPc);
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if (!a15004_looping)
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elprintf(EL_SVP, "SVP r%i: [%06x] %04x @%06x", realsize, a&0xffffff, d, SekPc);
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if (a == 0xa15004 && !(d&1)) {
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if (!a15004_looping)
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elprintf(EL_SVP, "SVP det TIGHT loop: a15004");
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a15004_looping = 1;
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}
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else a15004_looping = 0;
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//if (a == 0x30fe02 && d == 0)
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// elprintf(EL_ANOMALY, "SVP lag?");
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return d;
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}
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void PicoSVPWrite8(unsigned int a, unsigned int d, int realsize)
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{
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elprintf(EL_UIO|EL_SVP|EL_ANOMALY, "!!! SVP w%i: [%06x], %08x @%06x", realsize, a&0xffffff, d, SekPc);
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}
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void PicoSVPWrite16(unsigned int a, unsigned int d, int realsize)
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{
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static int clearing_ram = 0;
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// DRAM
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if ((a & 0xfe0000) == 0x300000)
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*(u16 *)(svp->dram + (a&0x1fffe)) = d;
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// regs
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else if ((a & 0xfffff0) == 0xa15000) {
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if (a == 0xa15000 || a == 0xa15002) {
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// just guessing here
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svp->ssp1601.gr[SSP_XST].h = d;
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svp->ssp1601.gr[SSP_PM0].h |= 2;
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svp->ssp1601.emu_status &= ~SSP_WAIT_PM0;
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}
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//else if (a == 0xa15006) svp->ssp1601.gr[SSP_PM0].h = d | (d << 1);
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// 0xa15006 probably has 'halt'
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}
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else
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elprintf(EL_UIO|EL_SVP|EL_ANOMALY, "SVP FIXME: unhandled w%i: [%06x] %04x @%06x", realsize, a&0xffffff, d, SekPc);
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if (a == 0x30fe06 && d != 0)
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svp->ssp1601.emu_status &= ~SSP_WAIT_30FE06;
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if (a == 0x30fe08 && d != 0)
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svp->ssp1601.emu_status &= ~SSP_WAIT_30FE08;
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// debug: detect RAM clears..
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CLEAR_DETECT(0x0221dc, 0x0221f0, "SVP RAM CLEAR (full) @ 0221C2");
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CLEAR_DETECT(0x02204c, 0x022068, "SVP RAM CLEAR 300000-31ffbf (1) @ 022032");
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CLEAR_DETECT(0x021900, 0x021ff0, "SVP RAM CLEAR 300000-305fff");
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CLEAR_DETECT(0x0220b0, 0x0220cc, "SVP RAM CLEAR 300000-31ffbf (2) @ 022096");
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clearing_ram = 0;
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elprintf(EL_SVP, "SVP w%i: [%06x] %04x @%06x", realsize, a&0xffffff, d, SekPc);
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}
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