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Initial cd emulation code. 

Provides the int13 hooks - still a work in progress.
This commit is contained in:
Kevin O'Connor 2008-03-04 19:45:04 -05:00
parent b74102d368
commit 941d3e4626
3 changed files with 199 additions and 12 deletions
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2
src/config.h
View File

@ -6,7 +6,7 @@
#define CONFIG_PS2_MOUSE 1
#define CONFIG_ATA 1
#define CONFIG_KBD_CALL_INT15_4F 1
#define CONFIG_ELTORITO_BOOT 0
#define CONFIG_ELTORITO_BOOT 1
#define CONFIG_MAX_ATA_INTERFACES 4
#define CONFIG_MAX_ATA_DEVICES (CONFIG_MAX_ATA_INTERFACES*2)

208
src/disk.c
View File

@ -109,6 +109,78 @@ basic_access(struct bregs *regs, u8 device, u16 command)
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
emu_access(struct bregs *regs, u8 device, u16 command)
{
u16 nbsectors = regs->al;
u16 cylinder = regs->ch | ((((u16) regs->cl) << 2) & 0x300);
u16 sector = regs->cl & 0x3f;
u16 head = regs->dh;
if ((nbsectors > 128) || (nbsectors == 0) || (sector == 0)) {
BX_INFO("int13_harddisk: function %02x, parameter out of range!\n"
, regs->ah);
disk_ret(regs, DISK_RET_EPARAM);
return;
}
u16 nlc = GET_EBDA(cdemu.vdevice.cylinders);
u16 nlh = GET_EBDA(cdemu.vdevice.heads);
u16 nlspt = GET_EBDA(cdemu.vdevice.spt);
// sanity check on cyl heads, sec
if ( (cylinder >= nlc) || (head >= nlh) || (sector > nlspt )) {
BX_INFO("int13_harddisk: function %02x, parameters out of"
" range %04x/%04x/%04x!\n"
, regs->ah, cylinder, head, sector);
disk_ret(regs, DISK_RET_EPARAM);
return;
}
if (!command) {
// If verify or seek
disk_ret(regs, DISK_RET_SUCCESS);
return;
}
u32 ilba = GET_EBDA(cdemu.ilba);
// calculate the virtual lba inside the image
u32 vlba= (((((u32)cylinder*(u32)nlh)+(u32)head)*(u32)nlspt)
+((u32)(sector-1)));
// start lba on cd
u32 slba = (u32)vlba/4;
u16 before= (u16)vlba%4;
// end lba on cd
u32 elba = (u32)(vlba+nbsectors-1)/4;
u32 count = elba-slba+1;
u32 lba = ilba+slba;
u16 segment = regs->es;
u16 offset = regs->bx;
u8 atacmd[12];
memset(atacmd, 0, sizeof(atacmd));
atacmd[0]=0x28; // READ command
atacmd[7]=(count & 0xff00) >> 8; // Sectors
atacmd[8]=(count & 0x00ff); // Sectors
atacmd[2]=(lba & 0xff000000) >> 24; // LBA
atacmd[3]=(lba & 0x00ff0000) >> 16;
atacmd[4]=(lba & 0x0000ff00) >> 8;
atacmd[5]=(lba & 0x000000ff);
u8 status = ata_cmd_packet(device, (u32)atacmd, sizeof(atacmd)
, before*512, count*2048L
, ATA_DATA_IN, segment, offset);
if (status != 0) {
BX_INFO("int13_harddisk: function %02x, error %02x !\n",regs->ah,status);
regs->al = 0;
disk_ret(regs, DISK_RET_EBADTRACK);
}
regs->al = nbsectors;
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
extended_access(struct bregs *regs, u8 device, u16 command)
{
@ -730,7 +802,7 @@ cdrom_wp(struct bregs *regs, u8 device)
disk_ret(regs, DISK_RET_EWRITEPROTECT);
}
void
static void
cdrom_13(struct bregs *regs, u8 device)
{
//debug_stub(regs);
@ -770,6 +842,113 @@ cdrom_13(struct bregs *regs, u8 device)
}
/****************************************************************
* CD emulation
****************************************************************/
// read disk sectors
static void
cdemu_1302(struct bregs *regs, u8 device)
{
emu_access(regs, device, ATA_CMD_READ_SECTORS);
}
// verify disk sectors
static void
cdemu_1304(struct bregs *regs, u8 device)
{
emu_access(regs, device, 0);
}
// read disk drive parameters
static void
cdemu_1308(struct bregs *regs, u8 device)
{
u16 nlc = GET_EBDA(cdemu.vdevice.cylinders) - 1;
u16 nlh = GET_EBDA(cdemu.vdevice.heads) - 1;
u16 nlspt = GET_EBDA(cdemu.vdevice.spt);
regs->al = 0x00;
regs->bl = 0x00;
regs->ch = nlc & 0xff;
regs->cl = ((nlc >> 2) & 0xc0) | (nlspt & 0x3f);
regs->dh = nlh;
// FIXME ElTorito Various. should send the real count of drives 1 or 2
// FIXME ElTorito Harddisk. should send the HD count
regs->dl = 0x02;
u8 media = GET_EBDA(cdemu.media);
if (media <= 3)
regs->bl = media * 2;
regs->es = SEG_BIOS;
regs->di = (u16)&diskette_param_table2;
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
cdemu_13(struct bregs *regs)
{
//debug_stub(regs);
u8 device = GET_EBDA(cdemu.controller_index) * 2;
device += GET_EBDA(cdemu.device_spec);
switch (regs->ah) {
case 0x02: cdemu_1302(regs, device); break;
case 0x04: cdemu_1304(regs, device); break;
case 0x08: cdemu_1308(regs, device); break;
// XXX - All other calls get passed to standard CDROM functions.
default: cdrom_13(regs, device); break;
}
}
struct eltorito_s {
u8 size;
u8 media;
u8 emulated_drive;
u8 controller_index;
u32 ilba;
u16 device_spec;
u16 buffer_segment;
u16 load_segment;
u16 sector_count;
u8 cylinders;
u8 sectors;
u8 heads;
};
#define SET_INT13ET(regs,var,val) \
SET_FARVAR((regs)->ds, ((struct eltorito_s*)((regs)->si+0))->var, (val))
// ElTorito - Terminate disk emu
static void
cdemu_134b(struct bregs *regs)
{
// FIXME ElTorito Hardcoded
SET_INT13ET(regs, size, 0x13);
SET_INT13ET(regs, media, GET_EBDA(cdemu.media));
SET_INT13ET(regs, emulated_drive, GET_EBDA(cdemu.emulated_drive));
SET_INT13ET(regs, controller_index, GET_EBDA(cdemu.controller_index));
SET_INT13ET(regs, ilba, GET_EBDA(cdemu.ilba));
SET_INT13ET(regs, device_spec, GET_EBDA(cdemu.device_spec));
SET_INT13ET(regs, buffer_segment, GET_EBDA(cdemu.buffer_segment));
SET_INT13ET(regs, load_segment, GET_EBDA(cdemu.load_segment));
SET_INT13ET(regs, sector_count, GET_EBDA(cdemu.sector_count));
SET_INT13ET(regs, cylinders, GET_EBDA(cdemu.vdevice.cylinders));
SET_INT13ET(regs, sectors, GET_EBDA(cdemu.vdevice.spt));
SET_INT13ET(regs, heads, GET_EBDA(cdemu.vdevice.heads));
// If we have to terminate emulation
if (regs->al == 0x00) {
// FIXME ElTorito Various. Should be handled accordingly to spec
SET_EBDA(cdemu.active, 0x00); // bye bye
}
disk_ret(regs, DISK_RET_SUCCESS);
}
/****************************************************************
* Entry points
****************************************************************/
@ -835,17 +1014,24 @@ handle_40(struct bregs *regs)
void VISIBLE
handle_13(struct bregs *regs)
{
//debug_enter(regs);
debug_enter(regs);
u8 drive = regs->dl;
// XXX
#if BX_ELTORITO_BOOT
if (regs->ah >= 0x4a || regs->ah <= 0x4d) {
int13_eltorito(regs);
} else if (cdemu_isactive() && cdrom_emulated_drive()) {
int13_cdemu(regs);
} else
#endif
handle_legacy_disk(regs, drive);
if (CONFIG_ELTORITO_BOOT) {
if (regs->ah == 0x4b) {
cdemu_134b(regs);
goto done;
}
if (GET_EBDA(cdemu.active)) {
if (drive == GET_EBDA(cdemu.emulated_drive)) {
cdemu_13(regs);
goto done;
}
drive--;
}
}
handle_legacy_disk(regs, drive);
done:
debug_exit(regs);
}

1
src/disk.h
View File

@ -94,6 +94,7 @@ struct floppy_ext_dbt_s {
};
// floppy.c
extern struct floppy_ext_dbt_s diskette_param_table2;
void floppy_13(struct bregs *regs, u8 drive);
void floppy_tick();