| 1 | /* |
| 2 | * The SVP chip emulator |
| 3 | * |
| 4 | * Copyright (c) GraÅžvydas "notaz" Ignotas, 2008 |
| 5 | * |
| 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. |
| 16 | * |
| 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. |
| 27 | */ |
| 28 | |
| 29 | #include <pico/pico_int.h> |
| 30 | #include <cpu/drc/cmn.h> |
| 31 | #include "compiler.h" |
| 32 | |
| 33 | #define SVP_CYCLES_LINE 850 |
| 34 | |
| 35 | svp_t *svp = NULL; |
| 36 | static int svp_dyn_ready = 0; |
| 37 | |
| 38 | /* save state stuff */ |
| 39 | typedef enum { |
| 40 | CHUNK_IRAM = CHUNK_CARTHW, |
| 41 | CHUNK_DRAM, |
| 42 | CHUNK_SSP |
| 43 | } chunk_name_e; |
| 44 | |
| 45 | static carthw_state_chunk svp_states[] = |
| 46 | { |
| 47 | { CHUNK_IRAM, 0x800, NULL }, |
| 48 | { CHUNK_DRAM, sizeof(svp->dram), NULL }, |
| 49 | { CHUNK_SSP, sizeof(svp->ssp1601) - sizeof(svp->ssp1601.drc), NULL }, |
| 50 | { 0, 0, NULL } |
| 51 | }; |
| 52 | |
| 53 | |
| 54 | static void PicoSVPReset(void) |
| 55 | { |
| 56 | elprintf(EL_SVP, "SVP reset"); |
| 57 | |
| 58 | memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800); |
| 59 | ssp1601_reset(&svp->ssp1601); |
| 60 | #ifdef _SVP_DRC |
| 61 | if ((PicoIn.opt & POPT_EN_DRC) && svp_dyn_ready) |
| 62 | ssp1601_dyn_reset(&svp->ssp1601); |
| 63 | #endif |
| 64 | } |
| 65 | |
| 66 | |
| 67 | static void PicoSVPLine(void) |
| 68 | { |
| 69 | int count = 1; |
| 70 | #if defined(__arm__) || defined(PSP) |
| 71 | // performance hack |
| 72 | static int delay_lines = 0; |
| 73 | delay_lines++; |
| 74 | if ((Pico.m.scanline&0xf) != 0xf && Pico.m.scanline != 261 && Pico.m.scanline != 311) |
| 75 | return; |
| 76 | count = delay_lines; |
| 77 | delay_lines = 0; |
| 78 | #endif |
| 79 | |
| 80 | #ifdef _SVP_DRC |
| 81 | if ((PicoIn.opt & POPT_EN_DRC) && svp_dyn_ready) |
| 82 | ssp1601_dyn_run(SVP_CYCLES_LINE * count); |
| 83 | else |
| 84 | #endif |
| 85 | { |
| 86 | ssp1601_run(SVP_CYCLES_LINE * count); |
| 87 | svp_dyn_ready = 0; // just in case |
| 88 | } |
| 89 | |
| 90 | // test mode |
| 91 | //if (Pico.m.frame_count == 13) PicoIn.pad[0] |= 0xff; |
| 92 | } |
| 93 | |
| 94 | |
| 95 | static int PicoSVPDma(unsigned int source, int len, unsigned short **base, unsigned int *mask) |
| 96 | { |
| 97 | if (source < Pico.romsize) // Rom |
| 98 | { |
| 99 | *base = (unsigned short *)(Pico.rom + (source & 0xfe0000)); |
| 100 | *mask = 0x1ffff; |
| 101 | return source - 2; |
| 102 | } |
| 103 | else if ((source & 0xfe0000) == 0x300000) |
| 104 | { |
| 105 | elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len); |
| 106 | *base = (unsigned short *)svp->dram; |
| 107 | *mask = 0x1ffff; |
| 108 | return source - 2; |
| 109 | } |
| 110 | else |
| 111 | elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len); |
| 112 | |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | |
| 117 | void PicoSVPInit(void) |
| 118 | { |
| 119 | #ifdef _SVP_DRC |
| 120 | // this is to unmap tcache and make |
| 121 | // mem available for large ROMs, MCD, etc. |
| 122 | drc_cmn_cleanup(); |
| 123 | #endif |
| 124 | } |
| 125 | |
| 126 | static void PicoSVPExit(void) |
| 127 | { |
| 128 | #ifdef _SVP_DRC |
| 129 | ssp1601_dyn_exit(); |
| 130 | #endif |
| 131 | } |
| 132 | |
| 133 | |
| 134 | void PicoSVPStartup(void) |
| 135 | { |
| 136 | int ret; |
| 137 | |
| 138 | elprintf(EL_STATUS, "SVP startup"); |
| 139 | |
| 140 | ret = PicoCartResize(Pico.romsize + sizeof(*svp)); |
| 141 | if (ret != 0) { |
| 142 | elprintf(EL_STATUS|EL_SVP, "OOM for SVP data"); |
| 143 | return; |
| 144 | } |
| 145 | |
| 146 | svp = (void *) ((char *)Pico.rom + Pico.romsize); |
| 147 | memset(svp, 0, sizeof(*svp)); |
| 148 | |
| 149 | // init SVP compiler |
| 150 | svp_dyn_ready = 0; |
| 151 | #ifdef _SVP_DRC |
| 152 | if (PicoIn.opt & POPT_EN_DRC) { |
| 153 | if (ssp1601_dyn_startup()) |
| 154 | return; |
| 155 | svp_dyn_ready = 1; |
| 156 | } |
| 157 | #endif |
| 158 | |
| 159 | // init ok, setup hooks.. |
| 160 | PicoCartMemSetup = PicoSVPMemSetup; |
| 161 | PicoDmaHook = PicoSVPDma; |
| 162 | PicoResetHook = PicoSVPReset; |
| 163 | PicoLineHook = PicoSVPLine; |
| 164 | PicoCartUnloadHook = PicoSVPExit; |
| 165 | |
| 166 | // save state stuff |
| 167 | svp_states[0].ptr = svp->iram_rom; |
| 168 | svp_states[1].ptr = svp->dram; |
| 169 | svp_states[2].ptr = &svp->ssp1601; |
| 170 | carthw_chunks = svp_states; |
| 171 | PicoIn.AHW |= PAHW_SVP; |
| 172 | } |
| 173 | |