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https://github.com/rvtr/GodMode9i.git
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101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
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#include <nds.h>
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#include <nds/ndstypes.h>
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#include <nds/disc_io.h>
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#include "tonccpy.h"
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#define SECTOR_SIZE 512
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const static u8 bootSector[] = {
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, SECTOR_SIZE & 0xFF, SECTOR_SIZE >> 8, 0x04, 0x01, 0x00,
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0x02, 0x00, 0x02, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 'R', 'A', 'M', 'D', 'R',
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'I', 'V', 'E', ' ', ' ', ' ', 'F', 'A', 'T'
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};
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u32 ramdSectors = 0;
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u8* ramdLoc = (u8*)NULL;
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u8* ramdLocMep = (u8*)NULL;
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bool ramd_startup() {
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if(REG_SCFG_EXT != 0) {
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ramdLoc = (u8*)malloc(0x4800 * SECTOR_SIZE);
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} else {
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ramdLoc = (u8*)malloc(0x8 * SECTOR_SIZE);
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}
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tonccpy(ramdLoc, bootSector, sizeof(bootSector));
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toncset32(ramdLoc + 0x20, ramdSectors, 1);
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toncset16(ramdLoc + 0x1FE, 0xAA55, 1);
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return true;
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}
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bool ramd_is_inserted() {
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return true;
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}
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bool ramd_read_sectors(sec_t sector, sec_t numSectors, void *buffer) {
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if(REG_SCFG_EXT != 0) {
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if(sector < 0x4800) {
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tonccpy(buffer, ramdLoc + (sector << 9), numSectors << 9);
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return true;
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} else if(sector <= 0xC800) {
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tonccpy(buffer, (void*)0x0D000000 + ((sector - 0x4800) << 9), numSectors << 9);
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return true;
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}
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} else if(sector < 0x8) {
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tonccpy(buffer, ramdLoc + (sector << 9), numSectors << 9);
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return true;
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} else if(sector <= ramdSectors - 0x8) {
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tonccpy(buffer, ramdLocMep + ((sector - 0x8) << 9), numSectors << 9);
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return true;
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}
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return false;
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}
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bool ramd_write_sectors(sec_t sector, sec_t numSectors, const void *buffer) {
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if(REG_SCFG_EXT != 0) {
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if(sector < 0x4800) {
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tonccpy(ramdLoc + (sector << 9), buffer, numSectors << 9);
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return true;
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} else if(sector <= 0xC800) {
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tonccpy((void*)0x0D000000 + ((sector - 0x4800) << 9), buffer, numSectors << 9);
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return true;
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}
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} else if(sector < 0x8) {
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tonccpy(ramdLoc + (sector << 9), buffer, numSectors << 9);
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return true;
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} else if(sector <= ramdSectors - 0x8) {
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tonccpy(ramdLocMep + ((sector - 0x8) << 9), buffer, numSectors << 9);
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return true;
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}
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return false;
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}
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bool ramd_clear_status() {
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return true;
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}
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bool ramd_shutdown() {
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if((REG_SCFG_EXT != 0) && ramdLoc) {
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free(ramdLoc);
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ramdLoc = NULL;
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}
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return true;
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}
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const DISC_INTERFACE io_ram_drive = {
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('R' << 24) | ('A' << 16) | ('M' << 8) | '1',
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FEATURE_MEDIUM_CANREAD | FEATURE_MEDIUM_CANWRITE,
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ramd_startup,
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ramd_is_inserted,
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ramd_read_sectors,
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ramd_write_sectors,
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ramd_clear_status,
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ramd_shutdown
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};
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