void reios_boot() {
//setup syscalls
//find boot file
//boot it
memset(GetMemPtr(0x8C000000, 0), 0xFF, 64 * 1024);
setup_syscall(hook_addr(&reios_sys_system), dc_bios_syscall_system);
setup_syscall(hook_addr(&reios_sys_font), dc_bios_syscall_font);
setup_syscall(hook_addr(&reios_sys_flashrom), dc_bios_syscall_flashrom);
setup_syscall(hook_addr(&reios_sys_gd), dc_bios_syscall_gd);
setup_syscall(hook_addr(&reios_sys_misc), dc_bios_syscall_misc);
WriteMem32(dc_bios_entrypoint_gd_do_bioscall, REIOS_OPCODE);
//Infinitive loop for arm !
WriteMem32(0x80800000, 0xEAFFFFFE);
if (settings.reios.ElfFile.size()) {
if (!reios_loadElf(settings.reios.ElfFile)) {
msgboxf("Failed to open %s\n", MBX_ICONERROR, settings.reios.ElfFile.c_str());
}
reios_setup_state(0x8C010000);
}
else {
const char* bootfile = reios_locate_ip();
if (!bootfile || !reios_locate_bootfile(bootfile))
msgboxf("Failed to locate bootfile", MBX_ICONERROR);
reios_setup_state(0xac008300);
}
}
void reios_sys_system() {
debugf("reios_sys_system\n");
u32 cmd = Sh4cntx.r[7];
switch (cmd) {
case 0: //SYSINFO_INIT
Sh4cntx.r[0] = 0;
break;
case 2: //SYSINFO_ICON
{
printf("SYSINFO_ICON\n");
/*
r4 = icon number (0-9, but only 5-9 seems to really be icons)
r5 = destination buffer (704 bytes in size)
*/
Sh4cntx.r[0] = 704;
}
break;
case 3: //SYSINFO_ID
{
WriteMem32(SYSINFO_ID_ADDR + 0, 0xe1e2e3e4);
WriteMem32(SYSINFO_ID_ADDR + 4, 0xe5e6e7e8);
Sh4cntx.r[0] = SYSINFO_ID_ADDR;
}
break;
default:
printf("unhandled: reios_sys_system\n");
break;
}
}
static void reios_boot(void)
{
printf("-----------------\n");
printf("REIOS: Booting up\n");
printf("-----------------\n");
//setup syscalls
//find boot file
//boot it
memset(GetMemPtr(0x8C000000, 0), 0xFF, 64 * 1024);
setup_syscall(hook_addr(&reios_sys_system), dc_bios_syscall_system);
setup_syscall(hook_addr(&reios_sys_font), dc_bios_syscall_font);
setup_syscall(hook_addr(&reios_sys_flashrom), dc_bios_syscall_flashrom);
setup_syscall(hook_addr(&reios_sys_gd), dc_bios_syscall_gd);
setup_syscall(hook_addr(&reios_sys_misc), dc_bios_syscall_misc);
WriteMem32(dc_bios_entrypoint_gd_do_bioscall, REIOS_OPCODE);
//Infinitive loop for arm !
WriteMem32(0x80800000, 0xEAFFFFFE);
if (settings.reios.ElfFile.size())
{
if (!reios_loadElf(settings.reios.ElfFile))
msgboxf("Failed to open %s\n", MBX_ICONERROR, settings.reios.ElfFile.c_str());
reios_setup_state(0x8C010000);
}
else
{
if (DC_PLATFORM == DC_PLATFORM_DREAMCAST)
{
if (!bootfile_inited)
msgboxf("Failed to locate bootfile", MBX_ICONERROR);
reios_setup_state(0xac008300);
}
else
{
verify(DC_PLATFORM == DC_PLATFORM_NAOMI);
u32* sz = (u32*)naomi_cart_GetPtr(0x368, 4);
if (!sz) {
msgboxf("Naomi boot failure", MBX_ICONERROR);
}
int size = *sz;
verify(size < RAM_SIZE && naomi_cart_GetPtr(size - 1, 1) && "Invalid cart size");
WriteMemBlock_nommu_ptr(0x0c020000, (u32*)naomi_cart_GetPtr(0, size), size);
reios_setuo_naomi(0x0c021000);
}
}
}
void setup_syscall(u32 hook_addr, u32 syscall_addr) {
WriteMem32(syscall_addr, hook_addr);
WriteMem16(hook_addr, REIOS_OPCODE);
debugf("reios: Patching syscall vector %08X, points to %08X\n", syscall_addr, hook_addr);
debugf("reios: - address %08X: data %04X [%04X]\n", hook_addr, ReadMem16(hook_addr), REIOS_OPCODE);
}
/*
- gdGdcReqCmd, 0
- gdGdcGetCmdStat, 1
- gdGdcExecServer, 2
- gdGdcInitSystem, 3
- gdGdcGetDrvStat, 4
*/
void gd_do_bioscall()
{
//looks like the "real" entrypoint for this on a dreamcast
gdrom_hle_op();
return;
/*
int func1, func2, arg1, arg2;
*/
switch (Sh4cntx.r[7]) {
case 0: //gdGdcReqCmd, wth is r6 ?
GD_HLE_Command(Sh4cntx.r[4], Sh4cntx.r[5]);
Sh4cntx.r[0] = 0xf344312e;
break;
case 1: //gdGdcGetCmdStat, r4 -> id as returned by gdGdcReqCmd, r5 -> buffer to get status in ram, r6 ?
Sh4cntx.r[0] = 0; //All good, no status info
break;
case 2: //gdGdcExecServer
//nop? returns something, though.
//Bios seems to be based on a cooperative threading model
//this is the "context" switch entry point
break;
case 3: //gdGdcInitSystem
//nop? returns something, though.
break;
case 4: //gdGdcGetDrvStat
/*
Looks to same as GDROM_CHECK_DRIVE
*/
WriteMem32(Sh4cntx.r[4] + 0, 0x02); // STANDBY
WriteMem32(Sh4cntx.r[4] + 4, 0x80); // CDROM | 0x80 for GDROM
Sh4cntx.r[0] = 0; // RET SUCCESS
break;
default:
printf("gd_do_bioscall: (%d) %d, %d, %d\n", Sh4cntx.r[4], Sh4cntx.r[5], Sh4cntx.r[6], Sh4cntx.r[7]);
break;
}
//gdGdcInitSystem
}
