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initial hle flash support

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inolen committed Jun 12, 2017
1 parent d106733 commit acd9e6c4a9cd6ca596a9d52dbbefb05c194e5776
Showing with 662 additions and 25 deletions.
  1. +4 −1 CMakeLists.txt
  2. +10 −8 docs/_docs/running.md
  3. +236 −0 src/bios/bios.c
  4. +13 −0 src/bios/bios.h
  5. +287 −0 src/bios/flash.c
  6. +15 −0 src/bios/flash.h
  7. +66 −0 src/bios/flash_types.h
  8. +3 −3 src/debugger.h
  9. +12 −2 src/dreamcast.c
  10. +3 −0 src/dreamcast.h
  11. +2 −0 src/emulator.c
  12. +4 −8 src/hw/aica/aica.c
  13. +2 −0 src/hw/aica/aica.h
  14. +5 −3 src/hw/rom/flash.c
@@ -158,6 +158,8 @@ endif()
#--------------------------------------------------

set(REDREAM_SOURCES
src/bios/bios.c
src/bios/flash.c
src/core/assert.c
src/core/exception_handler.c
src/core/filesystem.c
@@ -224,7 +226,8 @@ set(REDREAM_SOURCES
src/emulator.c
src/memory.c
src/scheduler.c
src/tracer.c)
src/tracer.c
)

if(PLATFORM_WINDOWS)
list(APPEND REDREAM_DEFS PLATFORM_WINDOWS=1)
@@ -3,18 +3,20 @@ title: Running
---

```
redream --bios=path/to/dc_boot.bin --flash=path/to/dc_flash.bin <cdi, gdi or bin file>
redream --bios=path/to/dc_boot.bin <cdi, gdi or bin file>
```

Command line flags are loaded from and saved to `$HOME/.redream/flags` each run. This means that bios and flash path, etc. only need to be set on the first run.
Command line flags are loaded from and saved to `$HOME/.redream/flags` each run. This means that bios path, etc. only need to be set on the first run.

### All options

```
--bios Path to BIOS [default: dc_boot.bin]
--flash Path to flash ROM [default: dc_flash.bin]
--audio Enable audio [default: 1]
--latency Preferred audio latency in MS [default: 100]
--verbose Enable debug logging [default: 0]
--perf Write perf-compatible maps for generated code [default: 0]
--bios Path to BIOS [default: dc_boot.bin]
--region System region [default: america, valid: japan, america, europe]
--language System language [default: english, valid: japanese, english, german, french, spanish, italian]
--broadcast System broadcast mode [default: ntsc, valid: ntsc, pal, pal_m, pal_n]
--audio Enable audio [default: 1]
--latency Preferred audio latency in MS [default: 100]
--verbose Enable debug logging [default: 0]
--perf Write perf-compatible maps for generated code [default: 0]
```
@@ -0,0 +1,236 @@
#include <time.h>
#include "bios/bios.h"
#include "bios/flash.h"
#include "core/math.h"
#include "core/option.h"
#include "dreamcast.h"
#include "hw/aica/aica.h"
#include "hw/rom/flash.h"
#include "render/imgui.h"

DEFINE_OPTION_STRING(region, "america", "System region");
DEFINE_OPTION_STRING(language, "english", "System language");
DEFINE_OPTION_STRING(broadcast, "ntsc", "System broadcast mode");

static const char *regions[] = {
"japan", "america", "europe",
};

static const char *languages[] = {
"japanese", "english", "german", "french", "spanish", "italian",
};

static const char *broadcasts[] = {
"ntsc", "pal", "pal_m", "pal_n",
};

struct bios {
struct dreamcast *dc;
};

static uint32_t bios_local_time() {
/* dreamcast system time is relative to 1/1/1950 00:00 */
struct tm timeinfo;
timeinfo.tm_year = 50;
timeinfo.tm_mon = 0;
timeinfo.tm_mday = 1;
timeinfo.tm_hour = 0;
timeinfo.tm_min = 0;
timeinfo.tm_sec = 0;

time_t base_time = mktime(&timeinfo);
time_t curr_time = time(NULL);
double delta = difftime(curr_time, base_time);
return (uint32_t)delta;
}

static void bios_override_flash_settings(struct bios *bios) {
struct dreamcast *dc = bios->dc;
struct flash *flash = dc->flash;

int region = 0;
int lang = 0;
int bcast = 0;
uint32_t time = bios_local_time();

for (int i = 0; i < array_size(regions); i++) {
if (!strcmp(OPTION_region, regions[i])) {
region = i;
break;
}
}

for (int i = 0; i < array_size(languages); i++) {
if (!strcmp(OPTION_language, languages[i])) {
lang = i;
break;
}
}

for (int i = 0; i < array_size(broadcasts); i++) {
if (!strcmp(OPTION_broadcast, broadcasts[i])) {
bcast = i;
break;
}
}

/* the region, language and broadcast settings exist in two locations:
1. 0x8c000070-74. this data seems to be the "factory settings" and is read
from 0x1a000 of the flash rom on init. this data is read-only
2. 0x8c000078-7f. this data seems to be the "user settings" and is copied
from partition 2, logical block 5 of the flash rom on init
in order to force these settings, write to all of the locations in flash
memory that they are ever read from */

/* overwrite factory flash settings */
char sysinfo[16];
memcpy(sysinfo, "00000Dreamcast ", sizeof(sysinfo));
sysinfo[2] = '0' + region;
sysinfo[3] = '0' + lang;
sysinfo[4] = '0' + bcast;

flash_write(flash, 0x1a000, sysinfo, sizeof(sysinfo));
flash_write(flash, 0x1a0a0, sysinfo, sizeof(sysinfo));

/* overwrite user flash settings */
struct flash_syscfg_block syscfg;
int res = flash_read_block(flash, FLASH_PT_USER, FLASH_USER_SYSCFG, &syscfg);
CHECK_EQ(res, 1);

syscfg.time_lo = time & 0xffff;
syscfg.time_hi = (time & 0xffff0000) >> 16;
syscfg.lang = lang;

res = flash_write_block(flash, FLASH_PT_USER, FLASH_USER_SYSCFG, &syscfg);
CHECK_EQ(res, 1);

/* overwrite aica clock to match the bios */
aica_set_clock(dc->aica, time);
}

static void bios_validate_flash(struct bios *bios) {
struct dreamcast *dc = bios->dc;
struct flash *flash = dc->flash;
struct flash_header_block header;

/* validate partition 0 (factory settings) */
char sysinfo[2][16];
flash_read(flash, 0x1a000, sysinfo[0], sizeof(sysinfo[0]));
flash_read(flash, 0x1a0a0, sysinfo[1], sizeof(sysinfo[1]));

/* write out default sysinfo if missing */
if (memcmp(&sysinfo[0][5], "Dreamcast ", 11) != 0 ||
memcmp(&sysinfo[1][5], "Dreamcast ", 11) != 0) {
memcpy(sysinfo[0], "00000Dreamcast ", sizeof(sysinfo[0]));
flash_write(flash, 0x1a000, sysinfo[0], sizeof(sysinfo[0]));
flash_write(flash, 0x1a0a0, sysinfo[0], sizeof(sysinfo[0]));
}

/* validate partition 1 (reserved) */
flash_erase_partition(flash, FLASH_PT_RESERVED);

/* validate partition 2 (user settings, block allocated) */
if (!flash_read_block(flash, FLASH_PT_USER, 0, &header)) {
flash_erase_partition(flash, FLASH_PT_USER);

/* write out default user settings */
struct flash_syscfg_block syscfg;
memset(&syscfg, 0xff, sizeof(syscfg));
syscfg.time_lo = 0;
syscfg.time_hi = 0;
syscfg.lang = 0;
syscfg.mono = 0;
syscfg.autostart = 1;

int res =
flash_write_block(flash, FLASH_PT_USER, FLASH_USER_SYSCFG, &syscfg);
CHECK_EQ(res, 1);
}

/* validate partition 3 (game settings, block allocated) */
if (!flash_read_block(flash, FLASH_PT_GAME, 0, &header)) {
flash_erase_partition(flash, FLASH_PT_GAME);
}

/* validate partition 4 (unknown, block allocated) */
if (!flash_read_block(flash, FLASH_PT_UNKNOWN, 0, &header)) {
flash_erase_partition(flash, FLASH_PT_UNKNOWN);
}
}

void bios_debug_menu(struct bios *bios) {
int changed = 0;

if (igBeginMainMenuBar()) {
if (igBeginMenu("BIOS", 1)) {
if (igBeginMenu("region", 1)) {
for (int i = 0; i < array_size(regions); i++) {
const char *region = regions[i];
int selected = !strcmp(OPTION_region, region);

if (igMenuItem(region, NULL, selected, 1)) {
changed = 1;
strncpy(OPTION_region, region, sizeof(OPTION_region));
}
}
igEndMenu();
}

if (igBeginMenu("language", 1)) {
for (int i = 0; i < array_size(languages); i++) {
const char *language = languages[i];
int selected = !strcmp(OPTION_language, language);

if (igMenuItem(language, NULL, selected, 1)) {
changed = 1;
strncpy(OPTION_language, language, sizeof(OPTION_language));
}
}
igEndMenu();
}

if (igBeginMenu("broadcast", 1)) {
for (int i = 0; i < array_size(broadcasts); i++) {
const char *broadcast = broadcasts[i];
int selected = !strcmp(OPTION_broadcast, broadcast);

if (igMenuItem(broadcast, NULL, selected, 1)) {
changed = 1;
strncpy(OPTION_broadcast, broadcast, sizeof(OPTION_broadcast));
}
}
igEndMenu();
}

igEndMenu();
}
igEndMainMenuBar();
}

if (changed) {
LOG_WARNING("bios settings changed, restart for changes to take effect");
}
}

int bios_init(struct bios *bios) {
bios_validate_flash(bios);

bios_override_flash_settings(bios);

return 1;
}

void bios_destroy(struct bios *bios) {
free(bios);
}

struct bios *bios_create(struct dreamcast *dc) {
struct bios *bios = calloc(1, sizeof(struct bios));

bios->dc = dc;

return bios;
}
@@ -0,0 +1,13 @@
#ifndef BIOS_H
#define BIOS_H

struct dreamcast;
struct bios;

struct bios *bios_create(struct dreamcast *dc);
void bios_destroy(struct bios *bios);

int bios_init(struct bios *bios);
void bios_debug_menu(struct bios *bios);

#endif

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