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- /*
- * The SVP chip emulator
- *
- * Copyright (c) Gražvydas "notaz" Ignotas, 2008
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * * Neither the name of the organization nor the
- * names of its contributors may be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #include "../../pico_int.h"
- #include "../../cpu/drc/cmn.h"
- #include "compiler.h"
- svp_t *svp = NULL;
- int PicoSVPCycles = 850; // cycles/line, just a guess
- static int svp_dyn_ready = 0;
- /* save state stuff */
- typedef enum {
- CHUNK_IRAM = CHUNK_CARTHW,
- CHUNK_DRAM,
- CHUNK_SSP
- } chunk_name_e;
- static carthw_state_chunk svp_states[] =
- {
- { CHUNK_IRAM, 0x800, NULL },
- { CHUNK_DRAM, sizeof(svp->dram), NULL },
- { CHUNK_SSP, sizeof(svp->ssp1601) - sizeof(svp->ssp1601.drc), NULL },
- { 0, 0, NULL }
- };
- static void PicoSVPReset(void)
- {
- elprintf(EL_SVP, "SVP reset");
- memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
- ssp1601_reset(&svp->ssp1601);
- #ifndef PSP
- if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready)
- ssp1601_dyn_reset(&svp->ssp1601);
- #endif
- }
- static void PicoSVPLine(void)
- {
- int count = 1;
- #if defined(ARM) || defined(PSP)
- // performance hack
- static int delay_lines = 0;
- delay_lines++;
- if ((Pico.m.scanline&0xf) != 0xf && Pico.m.scanline != 261 && Pico.m.scanline != 311)
- return;
- count = delay_lines;
- delay_lines = 0;
- #endif
- #ifndef PSP
- if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready)
- ssp1601_dyn_run(PicoSVPCycles * count);
- else
- #endif
- {
- ssp1601_run(PicoSVPCycles * count);
- svp_dyn_ready = 0; // just in case
- }
- // test mode
- //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
- }
- static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
- {
- if (source < Pico.romsize) // Rom
- {
- source -= 2;
- *srcp = (unsigned short *)(Pico.rom + (source&~1));
- *limitp = (unsigned short *)(Pico.rom + Pico.romsize);
- return 1;
- }
- else if ((source & 0xfe0000) == 0x300000)
- {
- elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
- source &= 0x1fffe;
- source -= 2;
- *srcp = (unsigned short *)(svp->dram + source);
- *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
- return 1;
- }
- else
- elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
- return 0;
- }
- void PicoSVPInit(void)
- {
- #ifndef PSP
- // this is to unmap tcache and make
- // mem available for large ROMs, MCD, etc.
- drc_cmn_cleanup();
- #endif
- }
- static void PicoSVPExit(void)
- {
- #ifndef PSP
- ssp1601_dyn_exit();
- #endif
- }
- void PicoSVPStartup(void)
- {
- int ret;
- elprintf(EL_STATUS, "SVP startup");
- ret = PicoCartResize(Pico.romsize + sizeof(*svp));
- if (ret != 0) {
- elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
- return;
- }
- svp = (void *) ((char *)Pico.rom + Pico.romsize);
- memset(svp, 0, sizeof(*svp));
- // init SVP compiler
- svp_dyn_ready = 0;
- #ifndef PSP
- if (PicoOpt & POPT_EN_SVP_DRC) {
- if (ssp1601_dyn_startup())
- return;
- svp_dyn_ready = 1;
- }
- #endif
- // init ok, setup hooks..
- PicoCartMemSetup = PicoSVPMemSetup;
- PicoDmaHook = PicoSVPDma;
- PicoResetHook = PicoSVPReset;
- PicoLineHook = PicoSVPLine;
- PicoCartUnloadHook = PicoSVPExit;
- // save state stuff
- svp_states[0].ptr = svp->iram_rom;
- svp_states[1].ptr = svp->dram;
- svp_states[2].ptr = &svp->ssp1601;
- carthw_chunks = svp_states;
- PicoAHW |= PAHW_SVP;
- }
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