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[picodrive.git] / pico / carthw / svp / svp.c
CommitLineData
cff531af 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 */
d4ca252d 28
9c9cda8c 29#include <pico/pico_int.h>
30#include <cpu/drc/cmn.h>
e807ac75 31#include "compiler.h"
f53f286a 32
f8ef8ff7 33svp_t *svp = NULL;
3d48ce71 34int PicoSVPCycles = 850; // cycles/line, just a guess
1ca2ea4f 35static int svp_dyn_ready = 0;
f8ef8ff7 36
945c2fdc 37/* save state stuff */
38typedef enum {
39 CHUNK_IRAM = CHUNK_CARTHW,
40 CHUNK_DRAM,
41 CHUNK_SSP
42} chunk_name_e;
43
44static carthw_state_chunk svp_states[] =
45{
46 { CHUNK_IRAM, 0x800, NULL },
47 { CHUNK_DRAM, sizeof(svp->dram), NULL },
e122fae6 48 { CHUNK_SSP, sizeof(svp->ssp1601) - sizeof(svp->ssp1601.drc), NULL },
945c2fdc 49 { 0, 0, NULL }
50};
51
52
017512f2 53static void PicoSVPReset(void)
54{
55 elprintf(EL_SVP, "SVP reset");
56
5de27868 57 memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
017512f2 58 ssp1601_reset(&svp->ssp1601);
7fd5d17b 59#ifdef _SVP_DRC
92dfd9af 60 if ((PicoOpt & POPT_EN_DRC) && svp_dyn_ready)
726bbb3e 61 ssp1601_dyn_reset(&svp->ssp1601);
6fc57144 62#endif
017512f2 63}
64
65
e7aac062 66static void PicoSVPLine(void)
017512f2 67{
e7aac062 68 int count = 1;
d4d62665 69#if defined(__arm__) || defined(PSP)
e7aac062 70 // performance hack
71 static int delay_lines = 0;
72 delay_lines++;
73 if ((Pico.m.scanline&0xf) != 0xf && Pico.m.scanline != 261 && Pico.m.scanline != 311)
74 return;
75 count = delay_lines;
76 delay_lines = 0;
77#endif
78
7fd5d17b 79#ifdef _SVP_DRC
92dfd9af 80 if ((PicoOpt & POPT_EN_DRC) && svp_dyn_ready)
726bbb3e 81 ssp1601_dyn_run(PicoSVPCycles * count);
6fc57144 82 else
83#endif
84 {
1ca2ea4f 85 ssp1601_run(PicoSVPCycles * count);
1b13dae0 86 svp_dyn_ready = 0; // just in case
87 }
d26dc685 88
89 // test mode
90 //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
017512f2 91}
92
93
5de27868 94static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
017512f2 95{
d4ca252d 96 if (source < Pico.romsize) // Rom
97 {
50483b53 98 source -= 2;
99 *srcp = (unsigned short *)(Pico.rom + (source&~1));
100 *limitp = (unsigned short *)(Pico.rom + Pico.romsize);
101 return 1;
102 }
103 else if ((source & 0xfe0000) == 0x300000)
017512f2 104 {
5de27868 105 elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
017512f2 106 source &= 0x1fffe;
30752975 107 source -= 2;
5de27868 108 *srcp = (unsigned short *)(svp->dram + source);
109 *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
017512f2 110 return 1;
111 }
d26dc685 112 else
113 elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
017512f2 114
115 return 0;
116}
117
118
f53f286a 119void PicoSVPInit(void)
e807ac75 120{
7fd5d17b 121#ifdef _SVP_DRC
72f63cf0 122 // this is to unmap tcache and make
123 // mem available for large ROMs, MCD, etc.
124 drc_cmn_cleanup();
125#endif
e807ac75 126}
127
679af8a3 128static void PicoSVPExit(void)
129{
7fd5d17b 130#ifdef _SVP_DRC
679af8a3 131 ssp1601_dyn_exit();
132#endif
133}
134
e807ac75 135
136void PicoSVPStartup(void)
f53f286a 137{
a736af3e 138 int ret;
f8ef8ff7 139
45f2f245 140 elprintf(EL_STATUS, "SVP startup");
f8ef8ff7 141
a736af3e 142 ret = PicoCartResize(Pico.romsize + sizeof(*svp));
143 if (ret != 0) {
017512f2 144 elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
f8ef8ff7 145 return;
146 }
147
a736af3e 148 svp = (void *) ((char *)Pico.rom + Pico.romsize);
f8ef8ff7 149 memset(svp, 0, sizeof(*svp));
150
726bbb3e 151 // init SVP compiler
1ca2ea4f 152 svp_dyn_ready = 0;
7fd5d17b 153#ifdef _SVP_DRC
92dfd9af 154 if (PicoOpt & POPT_EN_DRC) {
41397701 155 if (ssp1601_dyn_startup())
156 return;
1ca2ea4f 157 svp_dyn_ready = 1;
726bbb3e 158 }
6fc57144 159#endif
726bbb3e 160
f8ef8ff7 161 // init ok, setup hooks..
45f2f245 162 PicoCartMemSetup = PicoSVPMemSetup;
f8ef8ff7 163 PicoDmaHook = PicoSVPDma;
017512f2 164 PicoResetHook = PicoSVPReset;
165 PicoLineHook = PicoSVPLine;
679af8a3 166 PicoCartUnloadHook = PicoSVPExit;
945c2fdc 167
168 // save state stuff
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;
602133e1 173 PicoAHW |= PAHW_SVP;
f53f286a 174}
175