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Add SNES support code.

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This commit is contained in:
sorgelig
2018-11-29 20:23:44 +08:00
parent 0292a637b5
commit d3e0351f02
8 changed files with 201 additions and 4 deletions
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7
Makefile
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@@ -20,11 +20,12 @@ SHARPMZ_SRC = $(wildcard ./support/sharpmz/*.cpp)
ARCHIE_SRC = $(wildcard ./support/archie/*.cpp)
ST_SRC = $(wildcard ./support/st/*.cpp)
X86_SRC = $(wildcard ./support/x86/*.cpp)
SNES_SRC = $(wildcard ./support/snes/*.cpp)
VPATH = ./:./support/minimig:./support/sharpmz:./support/archie:./support/st:./support/x86
VPATH = ./:./support/minimig:./support/sharpmz:./support/archie:./support/st:./support/x86:./support/snes
OBJ = $(SRC:.c=.o) $(SRC2:.cpp=.o) $(MINIMIG_SRC:.cpp=.o) $(SHARPMZ_SRC:.cpp=.o) $(ARCHIE_SRC:.cpp=.o) $(ST_SRC:.cpp=.o) $(X86_SRC:.cpp=.o)
DEP = $(SRC:.c=.d) $(SRC2:.cpp=.d) $(MINIMIG_SRC:.cpp=.d) $(SHARPMZ_SRC:.cpp=.d) $(ARCHIE_SRC:.cpp=.d) $(ST_SRC:.cpp=.d) $(X86_SRC:.cpp=.d)
OBJ = $(SRC:.c=.o) $(SRC2:.cpp=.o) $(MINIMIG_SRC:.cpp=.o) $(SHARPMZ_SRC:.cpp=.o) $(ARCHIE_SRC:.cpp=.o) $(ST_SRC:.cpp=.o) $(X86_SRC:.cpp=.o) $(SNES_SRC:.cpp=.o)
DEP = $(SRC:.c=.d) $(SRC2:.cpp=.d) $(MINIMIG_SRC:.cpp=.d) $(SHARPMZ_SRC:.cpp=.d) $(ARCHIE_SRC:.cpp=.d) $(ST_SRC:.cpp=.d) $(X86_SRC:.cpp=.d) $(SNES_SRC:.cpp=.d)
CFLAGS = $(DFLAGS) -c -O3 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -DVDATE=\"`date +"%y%m%d"`\"
LFLAGS = -lc -lstdc++ -lrt

2
MiSTer.vcxproj
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@@ -63,6 +63,7 @@
<ClCompile Include="support\minimig\minimig_fdd.cpp" />
<ClCompile Include="support\minimig\minimig_hdd.cpp" />
<ClCompile Include="support\sharpmz\sharpmz.cpp" />
<ClCompile Include="support\snes\snes.cpp" />
<ClCompile Include="support\st\st_ikbd.cpp" />
<ClCompile Include="support\st\st_tos.cpp" />
<ClCompile Include="support\x86\x86.cpp" />
@@ -99,6 +100,7 @@
<ClInclude Include="support\minimig\minimig_hdd.h" />
<ClInclude Include="support\minimig\minimig_hdd_internal.h" />
<ClInclude Include="support\sharpmz\sharpmz.h" />
<ClInclude Include="support\snes\snes.h" />
<ClInclude Include="support\st\st_ikbd.h" />
<ClInclude Include="support\st\st_tos.h" />
<ClInclude Include="support\x86\x86.h" />

6
MiSTer.vcxproj.filters
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@@ -91,6 +91,9 @@
<ClCompile Include="support\x86\x86.cpp">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="support\snes\snes.cpp">
<Filter>Source Files</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ClInclude Include="battery.h">
@@ -195,5 +198,8 @@
<ClInclude Include="support\x86\x86.h">
<Filter>Header Files</Filter>
</ClInclude>
<ClInclude Include="support\snes\snes.h">
<Filter>Header Files</Filter>
</ClInclude>
</ItemGroup>
</Project>

5
support.h
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@@ -15,4 +15,7 @@
#include "support/st/st_tos.h"
// X86 support
#include "support/x86/x86.h"
#include "support/x86/x86.h"
// SNES support
#include "support/snes/snes.h"

160
support/snes/snes.cpp Normal file
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@@ -0,0 +1,160 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "../../file_io.h"
static uint8_t hdr[512];
enum HeaderField {
CartName = 0x00,
Mapper = 0x15,
RomType = 0x16,
RomSize = 0x17,
RamSize = 0x18,
CartRegion = 0x19,
Company = 0x1a,
Version = 0x1b,
Complement = 0x1c, //inverse checksum
Checksum = 0x1e,
ResetVector = 0x3c,
};
static uint32_t score_header(const uint8_t *data, uint32_t size, uint32_t addr)
{
if (size < addr + 64) return 0; //image too small to contain header at this location?
int score = 0;
uint16_t resetvector = data[addr + ResetVector] | (data[addr + ResetVector + 1] << 8);
uint16_t checksum = data[addr + Checksum] | (data[addr + Checksum + 1] << 8);
uint16_t complement = data[addr + Complement] | (data[addr + Complement + 1] << 8);
uint8_t resetop = data[(addr & ~0x7fff) | (resetvector & 0x7fff)]; //first opcode executed upon reset
uint8_t mapper = data[addr + Mapper] & ~0x10; //mask off irrelevent FastROM-capable bit
//$00:[0000-7fff] contains uninitialized RAM and MMIO.
//reset vector must point to ROM at $00:[8000-ffff] to be considered valid.
if (resetvector < 0x8000) return 0;
//some images duplicate the header in multiple locations, and others have completely
//invalid header information that cannot be relied upon.
//below code will analyze the first opcode executed at the specified reset vector to
//determine the probability that this is the correct header.
//most likely opcodes
if (resetop == 0x78 //sei
|| resetop == 0x18 //clc (clc; xce)
|| resetop == 0x38 //sec (sec; xce)
|| resetop == 0x9c //stz $nnnn (stz $4200)
|| resetop == 0x4c //jmp $nnnn
|| resetop == 0x5c //jml $nnnnnn
) score += 8;
//plausible opcodes
if (resetop == 0xc2 //rep #$nn
|| resetop == 0xe2 //sep #$nn
|| resetop == 0xad //lda $nnnn
|| resetop == 0xae //ldx $nnnn
|| resetop == 0xac //ldy $nnnn
|| resetop == 0xaf //lda $nnnnnn
|| resetop == 0xa9 //lda #$nn
|| resetop == 0xa2 //ldx #$nn
|| resetop == 0xa0 //ldy #$nn
|| resetop == 0x20 //jsr $nnnn
|| resetop == 0x22 //jsl $nnnnnn
) score += 4;
//implausible opcodes
if (resetop == 0x40 //rti
|| resetop == 0x60 //rts
|| resetop == 0x6b //rtl
|| resetop == 0xcd //cmp $nnnn
|| resetop == 0xec //cpx $nnnn
|| resetop == 0xcc //cpy $nnnn
) score -= 4;
//least likely opcodes
if (resetop == 0x00 //brk #$nn
|| resetop == 0x02 //cop #$nn
|| resetop == 0xdb //stp
|| resetop == 0x42 //wdm
|| resetop == 0xff //sbc $nnnnnn,x
) score -= 8;
//at times, both the header and reset vector's first opcode will match ...
//fallback and rely on info validity in these cases to determine more likely header.
//a valid checksum is the biggest indicator of a valid header.
if ((checksum + complement) == 0xffff && (checksum != 0) && (complement != 0)) score += 4;
if (addr == 0x007fc0 && mapper == 0x20) score += 2; //0x20 is usually LoROM
if (addr == 0x00ffc0 && mapper == 0x21) score += 2; //0x21 is usually HiROM
if (addr == 0x007fc0 && mapper == 0x22) score += 2; //0x22 is usually SDD1
if (addr == 0x40ffc0 && mapper == 0x25) score += 2; //0x25 is usually ExHiROM
if (data[addr + Company] == 0x33) score += 2; //0x33 indicates extended header
if (data[addr + RomType] < 0x08) score++;
if (data[addr + RomSize] < 0x10) score++;
if (data[addr + RamSize] < 0x08) score++;
if (data[addr + CartRegion] < 14) score++;
if (score < 0) score = 0;
return score;
}
static uint32_t find_header(const uint8_t *data, uint32_t size)
{
uint32_t score_lo = score_header(data, size, 0x007fc0);
uint32_t score_hi = score_header(data, size, 0x00ffc0);
uint32_t score_ex = score_header(data, size, 0x40ffc0);
if (score_ex) score_ex += 4; //favor ExHiROM on images > 32mbits
if (score_lo >= score_hi && score_lo >= score_ex)
{
return score_lo ? 0x007fc0 : 0;
}
else if (score_hi >= score_ex)
{
return score_hi ? 0x00ffc0 : 0;
}
return score_ex ? 0x40ffc0 : 0;
}
uint8_t* snes_get_header(fileTYPE *f)
{
memset(hdr, 0, sizeof(hdr));
uint8_t *buf = (uint8_t*)malloc(f->size);
if (buf)
{
FileSeekLBA(f, 0);
if (FileReadAdv(f, buf, f->size))
{
uint32_t addr = find_header(buf, f->size);
if (addr)
{
uint8_t romsz = buf[addr + RomSize];
uint8_t ramsz = buf[addr + RamSize];
if (romsz >= 0x10) romsz = 0;
if (ramsz >= 0x08) ramsz = 0;
hdr[0] = (ramsz << 4) | romsz;
hdr[1] = (addr == 0x00ffc0) ? 1 : (addr == 0x40ffc0) ? 5 : 0; //LHRom type
hdr[2] = buf[addr + RomType];
if ((buf[addr + CartRegion] >= 0x02 && buf[addr + CartRegion] <= 0x0C) || buf[addr + CartRegion] == 0x11)
{ //PAL Regions
hdr[3] |= 1;
}
*(uint32_t*)(&hdr[4]) = addr;
}
}
FileSeekLBA(f, 0);
free(buf);
}
return hdr;
}

6
support/snes/snes.h Normal file
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@@ -0,0 +1,6 @@
#ifndef SNES_H
#define SNES_H
uint8_t* snes_get_header(fileTYPE *f);
#endif

18
user_io.cpp
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@@ -152,6 +152,13 @@ char is_x86_core()
return (is_x86_type == 1);
}
static int is_snes_type = 0;
char is_snes_core()
{
if (!is_snes_type) is_snes_type = strcasecmp(core_name, "SNES") ? 2 : 1;
return (is_snes_type == 1);
}
char is_cpc_core()
{
return !strcasecmp(core_name, "amstrad");
@@ -1260,6 +1267,17 @@ int user_io_file_tx(const char* name, unsigned char index, char opensave, char m
}
else
{
if (is_snes_core())
{
printf("Load SNES ROM.\n");
uint8_t* buf = snes_get_header(&f);
hexdump(buf, 16, 0);
EnableFpga();
spi8(UIO_FILE_TX_DAT);
spi_write(buf, 512, fio_size);
DisableFpga();
}
while (bytes2send)
{
printf(".");

1
user_io.h
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@@ -196,6 +196,7 @@ char *user_io_get_core_name();
const char *user_io_get_core_name_ex();
char is_menu_core();
char is_x86_core();
char is_snes_core();
char has_menu();
int user_io_get_kbdemu();