// INT 13h Fixed Disk Services Entry Point
void VISIBLE16
handle_13(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_13);
u8 extdrive = regs->dl;
if (CONFIG_CDROM_EMU) {
if (regs->ah == 0x4b) {
cdemu_134b(regs);
return;
}
u16 ebda_seg = get_ebda_seg();
if (GET_EBDA2(ebda_seg, cdemu.active)) {
u8 emudrive = GET_EBDA2(ebda_seg, cdemu.emulated_extdrive);
if (extdrive == emudrive) {
// Access to an emulated drive.
struct drive_s *cdemu = GET_GLOBAL(cdemu_drive);
if (regs->ah > 0x16) {
// Only old-style commands supported.
disk_13XX(regs, cdemu);
return;
}
disk_13(regs, cdemu);
return;
}
if (extdrive < EXTSTART_CD && ((emudrive ^ extdrive) & 0x80) == 0)
// Adjust id to make room for emulated drive.
extdrive--;
}
}
handle_legacy_disk(regs, extdrive);
}
static void
floppy_13(struct bregs *regs, struct drive_s *drive_gf)
{
// Only limited commands are supported on floppies.
switch (regs->ah) {
case 0x00:
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x08:
case 0x15:
case 0x16:
disk_13(regs, drive_gf);
break;
default: disk_13XX(regs, drive_gf); break;
}
}
static void
disk_13(struct bregs *regs, struct drive_s *drive_gf)
{
//debug_stub(regs);
// clear completion flag
SET_BDA(disk_interrupt_flag, 0);
switch (regs->ah) {
case 0x00: disk_1300(regs, drive_gf); break;
case 0x01: disk_1301(regs, drive_gf); break;
case 0x02: disk_1302(regs, drive_gf); break;
case 0x03: disk_1303(regs, drive_gf); break;
case 0x04: disk_1304(regs, drive_gf); break;
case 0x05: disk_1305(regs, drive_gf); break;
case 0x08: disk_1308(regs, drive_gf); break;
case 0x09: disk_1309(regs, drive_gf); break;
case 0x0c: disk_130c(regs, drive_gf); break;
case 0x0d: disk_130d(regs, drive_gf); break;
case 0x10: disk_1310(regs, drive_gf); break;
case 0x11: disk_1311(regs, drive_gf); break;
case 0x14: disk_1314(regs, drive_gf); break;
case 0x15: disk_1315(regs, drive_gf); break;
case 0x16: disk_1316(regs, drive_gf); break;
case 0x41: disk_1341(regs, drive_gf); break;
case 0x42: disk_1342(regs, drive_gf); break;
case 0x43: disk_1343(regs, drive_gf); break;
case 0x44: disk_1344(regs, drive_gf); break;
case 0x45: disk_1345(regs, drive_gf); break;
case 0x46: disk_1346(regs, drive_gf); break;
case 0x47: disk_1347(regs, drive_gf); break;
case 0x48: disk_1348(regs, drive_gf); break;
case 0x49: disk_1349(regs, drive_gf); break;
case 0x4e: disk_134e(regs, drive_gf); break;
default: disk_13XX(regs, drive_gf); break;
}
}