2 * The SVP chip emulator
4 * Copyright (c) GraÅžvydas "notaz" Ignotas, 2008
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * * Neither the name of the organization nor the
14 * names of its contributors may be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <pico/pico_int.h>
30 #include <cpu/drc/cmn.h>
34 int PicoSVPCycles = 850; // cycles/line, just a guess
35 static int svp_dyn_ready = 0;
37 /* save state stuff */
39 CHUNK_IRAM = CHUNK_CARTHW,
44 static carthw_state_chunk svp_states[] =
46 { CHUNK_IRAM, 0x800, NULL },
47 { CHUNK_DRAM, sizeof(svp->dram), NULL },
48 { CHUNK_SSP, sizeof(svp->ssp1601) - sizeof(svp->ssp1601.drc), NULL },
53 static void PicoSVPReset(void)
55 elprintf(EL_SVP, "SVP reset");
57 memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
58 ssp1601_reset(&svp->ssp1601);
60 if ((PicoOpt & POPT_EN_DRC) && svp_dyn_ready)
61 ssp1601_dyn_reset(&svp->ssp1601);
66 static void PicoSVPLine(void)
69 #if defined(__arm__) || defined(PSP)
71 static int delay_lines = 0;
73 if ((Pico.m.scanline&0xf) != 0xf && Pico.m.scanline != 261 && Pico.m.scanline != 311)
80 if ((PicoOpt & POPT_EN_DRC) && svp_dyn_ready)
81 ssp1601_dyn_run(PicoSVPCycles * count);
85 ssp1601_run(PicoSVPCycles * count);
86 svp_dyn_ready = 0; // just in case
90 //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
94 static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
96 if (source < Pico.romsize) // Rom
99 *srcp = (unsigned short *)(Pico.rom + (source&~1));
100 *limitp = (unsigned short *)(Pico.rom + Pico.romsize);
103 else if ((source & 0xfe0000) == 0x300000)
105 elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
108 *srcp = (unsigned short *)(svp->dram + source);
109 *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
113 elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
119 void PicoSVPInit(void)
122 // this is to unmap tcache and make
123 // mem available for large ROMs, MCD, etc.
128 static void PicoSVPExit(void)
136 void PicoSVPStartup(void)
140 elprintf(EL_STATUS, "SVP startup");
142 ret = PicoCartResize(Pico.romsize + sizeof(*svp));
144 elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
148 svp = (void *) ((char *)Pico.rom + Pico.romsize);
149 memset(svp, 0, sizeof(*svp));
154 if (PicoOpt & POPT_EN_DRC) {
155 if (ssp1601_dyn_startup())
161 // init ok, setup hooks..
162 PicoCartMemSetup = PicoSVPMemSetup;
163 PicoDmaHook = PicoSVPDma;
164 PicoResetHook = PicoSVPReset;
165 PicoLineHook = PicoSVPLine;
166 PicoCartUnloadHook = PicoSVPExit;
169 svp_states[0].ptr = svp->iram_rom;
170 svp_states[1].ptr = svp->dram;
171 svp_states[2].ptr = &svp->ssp1601;
172 carthw_chunks = svp_states;