143 lines
4.0 KiB
C
143 lines
4.0 KiB
C
/*
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* The SVP chip emulator
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*
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* Copyright (c) Gražvydas "notaz" Ignotas, 2008
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the organization nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <pico/pico_int.h>
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svp_t *svp = NULL;
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int PicoSVPCycles = 850; // cycles/line, just a guess
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static int svp_dyn_ready = 0;
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static void PicoSVPReset(void)
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{
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elprintf(EL_SVP, "SVP reset");
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memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
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ssp1601_reset(&svp->ssp1601);
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#ifdef _SVP_DRC
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if ((PicoOpt & POPT_EN_DRC) && svp_dyn_ready)
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ssp1601_dyn_reset(&svp->ssp1601);
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#endif
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}
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static void PicoSVPLine(void)
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{
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int count = 1;
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#if defined(__arm__) || defined(PSP)
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// performance hack
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static int delay_lines = 0;
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delay_lines++;
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if ((Pico.m.scanline&0xf) != 0xf && Pico.m.scanline != 261 && Pico.m.scanline != 311)
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return;
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count = delay_lines;
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delay_lines = 0;
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#endif
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#ifdef _SVP_DRC
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if ((PicoOpt & POPT_EN_DRC) && svp_dyn_ready)
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ssp1601_dyn_run(PicoSVPCycles * count);
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else
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#endif
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{
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ssp1601_run(PicoSVPCycles * count);
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svp_dyn_ready = 0; // just in case
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}
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// test mode
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//if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
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}
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static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
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{
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if (source < Pico.romsize) // Rom
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{
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source -= 2;
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*srcp = (unsigned short *)(Pico.rom + (source&~1));
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*limitp = (unsigned short *)(Pico.rom + Pico.romsize);
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return 1;
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}
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else if ((source & 0xfe0000) == 0x300000)
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{
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elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
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source &= 0x1fffe;
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source -= 2;
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*srcp = (unsigned short *)(svp->dram + source);
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*limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
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return 1;
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}
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else
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elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
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return 0;
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}
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void PicoSVPInit(void)
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{
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#ifdef _SVP_DRC
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// this is to unmap tcache and make
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// mem available for large ROMs, MCD, etc.
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drc_cmn_cleanup();
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#endif
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}
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void PicoSVPStartup(void)
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{
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int ret;
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elprintf(EL_STATUS, "SVP startup");
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ret = PicoCartResize(Pico.romsize + sizeof(*svp));
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if (ret != 0) {
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elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
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return;
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}
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svp = (void *) ((char *)Pico.rom + Pico.romsize);
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memset(svp, 0, sizeof(*svp));
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// init SVP compiler
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svp_dyn_ready = 0;
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#ifdef _SVP_DRC
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if (PicoOpt & POPT_EN_DRC) {
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if (ssp1601_dyn_startup())
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return;
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svp_dyn_ready = 1;
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}
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#endif
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// init ok, setup hooks..
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PicoCartMemSetup = PicoSVPMemSetup;
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PicoDmaHook = PicoSVPDma;
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PicoResetHook = PicoSVPReset;
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PicoLineHook = PicoSVPLine;
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PicoAHW |= PAHW_SVP;
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}
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