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// 16bit code to access cdrom drives.
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2002 MandrakeSoft S.A.
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "disk.h" // cdrom_13
#include "util.h" // memset
#include "bregs.h" // struct bregs
#include "biosvar.h" // GET_EBDA
#include "atabits.h" // ATA_TYPE_ATAPI
/****************************************************************
* CDROM functions
****************************************************************/
// read disk drive size
static void
cdrom_1315(struct bregs *regs, u8 device)
{
disk_ret(regs, DISK_RET_EADDRNOTFOUND);
}
// lock
static void
cdrom_134500(struct bregs *regs, u8 device)
{
u16 ebda_seg = get_ebda_seg();
u8 locks = GET_EBDA2(ebda_seg, cdrom_locks[device]);
if (locks == 0xff) {
regs->al = 1;
disk_ret(regs, DISK_RET_ETOOMANYLOCKS);
return;
}
SET_EBDA2(ebda_seg, cdrom_locks[device], locks + 1);
regs->al = 1;
disk_ret(regs, DISK_RET_SUCCESS);
}
// unlock
static void
cdrom_134501(struct bregs *regs, u8 device)
{
u16 ebda_seg = get_ebda_seg();
u8 locks = GET_EBDA2(ebda_seg, cdrom_locks[device]);
if (locks == 0x00) {
regs->al = 0;
disk_ret(regs, DISK_RET_ENOTLOCKED);
return;
}
locks--;
SET_EBDA2(ebda_seg, cdrom_locks[device], locks);
regs->al = (locks ? 1 : 0);
disk_ret(regs, DISK_RET_SUCCESS);
}
// status
static void
cdrom_134502(struct bregs *regs, u8 device)
{
u8 locks = GET_EBDA(cdrom_locks[device]);
regs->al = (locks ? 1 : 0);
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
cdrom_1345XX(struct bregs *regs, u8 device)
{
disk_ret(regs, DISK_RET_EPARAM);
}
// IBM/MS lock/unlock drive
static void
cdrom_1345(struct bregs *regs, u8 device)
{
switch (regs->al) {
case 0x00: cdrom_134500(regs, device); break;
case 0x01: cdrom_134501(regs, device); break;
case 0x02: cdrom_134502(regs, device); break;
default: cdrom_1345XX(regs, device); break;
}
}
// IBM/MS eject media
static void
cdrom_1346(struct bregs *regs, u8 device)
{
u8 locks = GET_EBDA(cdrom_locks[device]);
if (locks != 0) {
disk_ret(regs, DISK_RET_ELOCKED);
return;
}
// FIXME should handle 0x31 no media in device
// FIXME should handle 0xb5 valid request failed
// Call removable media eject
struct bregs br;
memset(&br, 0, sizeof(br));
br.ah = 0x52;
call16_int(0x15, &br);
if (br.ah || br.flags & F_CF) {
disk_ret(regs, DISK_RET_ELOCKED);
return;
}
disk_ret(regs, DISK_RET_SUCCESS);
}
// IBM/MS extended media change
static void
cdrom_1349(struct bregs *regs, u8 device)
{
set_fail(regs);
// always send changed ??
regs->ah = DISK_RET_ECHANGED;
}
static void
cdrom_ok(struct bregs *regs, u8 device)
{
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
cdrom_wp(struct bregs *regs, u8 device)
{
disk_ret(regs, DISK_RET_EWRITEPROTECT);
}
void
cdrom_13(struct bregs *regs, u8 device)
{
//debug_stub(regs);
switch (regs->ah) {
case 0x15: cdrom_1315(regs, device); break;
case 0x45: cdrom_1345(regs, device); break;
case 0x46: cdrom_1346(regs, device); break;
case 0x49: cdrom_1349(regs, device); break;
// These functions are the same as for hard disks
case 0x01:
case 0x41:
case 0x42:
case 0x44:
case 0x47:
case 0x48:
case 0x4e:
disk_13(regs, device);
break;
// all these functions return SUCCESS
case 0x00: // disk controller reset
case 0x09: // initialize drive parameters
case 0x0c: // seek to specified cylinder
case 0x0d: // alternate disk reset
case 0x10: // check drive ready
case 0x11: // recalibrate
case 0x14: // controller internal diagnostic
case 0x16: // detect disk change
cdrom_ok(regs, device);
break;
// all these functions return disk write-protected
case 0x03: // write disk sectors
case 0x05: // format disk track
case 0x43: // IBM/MS extended write
cdrom_wp(regs, device);
break;
default: disk_13XX(regs, device); break;
}
}
/****************************************************************
* CD emulation
****************************************************************/
static void
cdemu_1302(struct bregs *regs, u8 device)
{
cdemu_access(regs, device, CMD_READ);
}
static void
cdemu_1304(struct bregs *regs, u8 device)
{
cdemu_access(regs, device, CMD_VERIFY);
}
// read disk drive parameters
static void
cdemu_1308(struct bregs *regs, u8 device)
{
u16 ebda_seg = get_ebda_seg();
u16 nlc = GET_EBDA2(ebda_seg, cdemu.lchs.cylinders) - 1;
u16 nlh = GET_EBDA2(ebda_seg, cdemu.lchs.heads) - 1;
u16 nlspt = GET_EBDA2(ebda_seg, cdemu.lchs.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_EBDA2(ebda_seg, cdemu.media);
if (media <= 3)
regs->bl = media * 2;
regs->es = SEG_BIOS;
regs->di = (u32)&diskette_param_table2;
disk_ret(regs, DISK_RET_SUCCESS);
}
void
cdemu_13(struct bregs *regs)
{
//debug_stub(regs);
u16 ebda_seg = get_ebda_seg();
u8 device = GET_EBDA2(ebda_seg, cdemu.controller_index) * 2;
device += GET_EBDA2(ebda_seg, 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;
// These functions are the same as standard CDROM.
case 0x00:
case 0x01:
case 0x03:
case 0x05:
case 0x09:
case 0x0c:
case 0x0d:
case 0x10:
case 0x11:
case 0x14:
case 0x15:
case 0x16:
cdrom_13(regs, device);
break;
default: disk_13XX(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
void
cdemu_134b(struct bregs *regs)
{
// FIXME ElTorito Hardcoded
u16 ebda_seg = get_ebda_seg();
SET_INT13ET(regs, size, 0x13);
SET_INT13ET(regs, media, GET_EBDA2(ebda_seg, cdemu.media));
SET_INT13ET(regs, emulated_drive, GET_EBDA2(ebda_seg, cdemu.emulated_drive));
SET_INT13ET(regs, controller_index
, GET_EBDA2(ebda_seg, cdemu.controller_index));
SET_INT13ET(regs, ilba, GET_EBDA2(ebda_seg, cdemu.ilba));
SET_INT13ET(regs, device_spec, GET_EBDA2(ebda_seg, cdemu.device_spec));
SET_INT13ET(regs, buffer_segment, GET_EBDA2(ebda_seg, cdemu.buffer_segment));
SET_INT13ET(regs, load_segment, GET_EBDA2(ebda_seg, cdemu.load_segment));
SET_INT13ET(regs, sector_count, GET_EBDA2(ebda_seg, cdemu.sector_count));
SET_INT13ET(regs, cylinders, GET_EBDA2(ebda_seg, cdemu.lchs.cylinders));
SET_INT13ET(regs, sectors, GET_EBDA2(ebda_seg, cdemu.lchs.spt));
SET_INT13ET(regs, heads, GET_EBDA2(ebda_seg, cdemu.lchs.heads));
// If we have to terminate emulation
if (regs->al == 0x00) {
// FIXME ElTorito Various. Should be handled accordingly to spec
SET_EBDA2(ebda_seg, cdemu.active, 0x00); // bye bye
}
disk_ret(regs, DISK_RET_SUCCESS);
}
/****************************************************************
* CD booting
****************************************************************/
// Request SENSE
static int
atapi_get_sense(int device, u8 *asc, u8 *ascq)
{
u8 atacmd[12], buffer[18];
memset(atacmd, 0, sizeof(atacmd));
atacmd[0] = ATA_CMD_REQUEST_SENSE;
atacmd[4] = sizeof(buffer);
int ret = ata_cmd_packet(device, atacmd, sizeof(atacmd), sizeof(buffer)
, MAKE_FLATPTR(GET_SEG(SS), buffer));
if (ret)
return ret;
*asc = buffer[12];
*ascq = buffer[13];
return 0;
}
// Request capacity
static int
atapi_read_capacity(int device, u32 *blksize, u32 *sectors)
{
u8 packet[12], buf[8];
memset(packet, 0, sizeof(packet));
packet[0] = 0x25; /* READ CAPACITY */
int ret = ata_cmd_packet(device, packet, sizeof(packet), sizeof(buf)
, MAKE_FLATPTR(GET_SEG(SS), buf));
if (ret)
return ret;
*blksize = (((u32)buf[4] << 24) | ((u32)buf[5] << 16)
| ((u32)buf[6] << 8) | ((u32)buf[7] << 0));
*sectors = (((u32)buf[0] << 24) | ((u32)buf[1] << 16)
| ((u32)buf[2] << 8) | ((u32)buf[3] << 0));
return 0;
}
static int
atapi_is_ready(u16 device)
{
dprintf(6, "atapi_is_ready (device=%d)\n", device);
/* Retry READ CAPACITY for 5 seconds unless MEDIUM NOT PRESENT is
* reported by the device. If the device reports "IN PROGRESS",
* 30 seconds is added. */
u32 blksize, sectors;
int in_progress = 0;
u64 end = calc_future_tsc(5000);
for (;;) {
if (rdtscll() > end) {
dprintf(1, "read capacity failed\n");
return -1;
}
int ret = atapi_read_capacity(device, &blksize, &sectors);
if (!ret)
// Success
break;
u8 asc, ascq;
ret = atapi_get_sense(device, &asc, &ascq);
if (ret)
// Error - retry.
continue;
// Sense succeeded.
if (asc == 0x3a) { /* MEDIUM NOT PRESENT */
dprintf(1, "Device reports MEDIUM NOT PRESENT\n");
return -1;
}
if (asc == 0x04 && ascq == 0x01 && !in_progress) {
/* IN PROGRESS OF BECOMING READY */
printf("Waiting for device to detect medium... ");
/* Allow 30 seconds more */
end = calc_future_tsc(30000);
in_progress = 1;
}
}
if (blksize != GET_GLOBAL(ATA.devices[device].blksize)) {
printf("Unsupported sector size %u\n", blksize);
return -1;
}
dprintf(6, "sectors=%u\n", sectors);
printf("%dMB medium detected\n", sectors>>(20-11));
return 0;
}
int
cdrom_boot(int cdid)
{
// Verify device is a cdrom.
if (cdid >= ATA.cdcount)
return 1;
int driveid = GET_GLOBAL(ATA.idmap[1][cdid]);
if (GET_GLOBAL(ATA.devices[driveid].device) != ATA_DEVICE_CDROM)
return 2;
int ret = atapi_is_ready(driveid);
if (ret)
dprintf(1, "atapi_is_ready returned %d\n", ret);
// Read the Boot Record Volume Descriptor
u8 buffer[2048];
struct disk_op_s dop;
memset(&dop, 0, sizeof(dop));
dop.driveid = driveid;
dop.lba = 0x11;
dop.count = 1;
dop.buf_fl = MAKE_FLATPTR(GET_SEG(SS), buffer);
ret = cdrom_read(&dop);
if (ret)
return 3;
// Validity checks
if (buffer[0])
return 4;
if (strcmp((char*)&buffer[1], "CD001\001EL TORITO SPECIFICATION") != 0)
return 5;
// ok, now we calculate the Boot catalog address
u32 lba = *(u32*)&buffer[0x47];
// And we read the Boot Catalog
dop.lba = lba;
ret = cdrom_read(&dop);
if (ret)
return 7;
// Validation entry
if (buffer[0x00] != 0x01)
return 8; // Header
if (buffer[0x01] != 0x00)
return 9; // Platform
if (buffer[0x1E] != 0x55)
return 10; // key 1
if (buffer[0x1F] != 0xAA)
return 10; // key 2
// Initial/Default Entry
if (buffer[0x20] != 0x88)
return 11; // Bootable
u16 ebda_seg = get_ebda_seg();
u8 media = buffer[0x21];
SET_EBDA2(ebda_seg, cdemu.media, media);
SET_EBDA2(ebda_seg, cdemu.controller_index, driveid/2);
SET_EBDA2(ebda_seg, cdemu.device_spec, driveid%2);
u16 boot_segment = *(u16*)&buffer[0x22];
if (!boot_segment)
boot_segment = 0x07C0;
SET_EBDA2(ebda_seg, cdemu.load_segment, boot_segment);
SET_EBDA2(ebda_seg, cdemu.buffer_segment, 0x0000);
u16 nbsectors = *(u16*)&buffer[0x26];
SET_EBDA2(ebda_seg, cdemu.sector_count, nbsectors);
lba = *(u32*)&buffer[0x28];
SET_EBDA2(ebda_seg, cdemu.ilba, lba);
// And we read the image in memory
dop.lba = lba;
dop.count = DIV_ROUND_UP(nbsectors, 4);
dop.buf_fl = MAKE_FLATPTR(boot_segment, 0);
ret = cdrom_read(&dop);
if (ret)
return 12;
if (media == 0) {
// No emulation requested - return success.
SET_EBDA2(ebda_seg, cdemu.emulated_drive, 0xE0 + cdid);
return 0;
}
// Emulation of a floppy/harddisk requested
if (! CONFIG_CDROM_EMU)
return 13;
// Set emulated drive id and increase bios installed hardware
// number of devices
if (media < 4) {
// Floppy emulation
SET_EBDA2(ebda_seg, cdemu.emulated_drive, 0x00);
SETBITS_BDA(equipment_list_flags, 0x41);
switch (media) {
case 0x01: // 1.2M floppy
SET_EBDA2(ebda_seg, cdemu.lchs.spt, 15);
SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
break;
case 0x02: // 1.44M floppy
SET_EBDA2(ebda_seg, cdemu.lchs.spt, 18);
SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
break;
case 0x03: // 2.88M floppy
SET_EBDA2(ebda_seg, cdemu.lchs.spt, 36);
SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
break;
}
} else {
// Harddrive emulation
SET_EBDA2(ebda_seg, cdemu.emulated_drive, 0x80);
SET_BDA(hdcount, GET_BDA(hdcount) + 1);
// Peak at partition table to get chs.
struct mbr_s *mbr = (void*)0;
u8 sptcyl = GET_FARVAR(boot_segment, mbr->partitions[0].last.sptcyl);
u8 cyllow = GET_FARVAR(boot_segment, mbr->partitions[0].last.cyllow);
u8 heads = GET_FARVAR(boot_segment, mbr->partitions[0].last.heads);
SET_EBDA2(ebda_seg, cdemu.lchs.spt, sptcyl & 0x3f);
SET_EBDA2(ebda_seg, cdemu.lchs.cylinders
, ((sptcyl<<2)&0x300) + cyllow + 1);
SET_EBDA2(ebda_seg, cdemu.lchs.heads, heads + 1);
}
// everything is ok, so from now on, the emulation is active
SET_EBDA2(ebda_seg, cdemu.active, 0x01);
dprintf(6, "cdemu media=%d\n", media);
return 0;
}