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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 GPLv3 license.
#include "disk.h" // cdrom_13
#include "util.h" // memset
#include "ata.h" // ATA_CMD_READ_SECTORS
#include "bregs.h" // struct bregs
#include "biosvar.h" // GET_EBDA
/****************************************************************
* 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)
{
u8 locks = GET_EBDA(ata.devices[device].lock);
if (locks == 0xff) {
regs->al = 1;
disk_ret(regs, DISK_RET_ETOOMANYLOCKS);
return;
}
SET_EBDA(ata.devices[device].lock, locks + 1);
regs->al = 1;
disk_ret(regs, DISK_RET_SUCCESS);
}
// unlock
static void
cdrom_134501(struct bregs *regs, u8 device)
{
u8 locks = GET_EBDA(ata.devices[device].lock);
if (locks == 0x00) {
regs->al = 0;
disk_ret(regs, DISK_RET_ENOTLOCKED);
return;
}
locks--;
SET_EBDA(ata.devices[device].lock, 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(ata.devices[device].lock);
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(ata.devices[device].lock);
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
****************************************************************/
// Read a series of 512 byte sectors from the cdrom starting at the
// image offset.
__always_inline int
cdrom_read_emu(u16 biosid, u32 vlba, u32 count, void *far_buffer)
{
u32 ilba = GET_EBDA(cdemu.ilba);
return cdrom_read_512(biosid, ilba * 4 + vlba, count, far_buffer);
}
// 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 = (u32)&diskette_param_table2;
disk_ret(regs, DISK_RET_SUCCESS);
}
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) {
// These functions are the same as for hard disks
case 0x02:
case 0x04:
disk_13(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;
case 0x08: cdemu_1308(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
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);
}
/****************************************************************
* CD booting
****************************************************************/
// Request SENSE
static int
atapi_get_sense(u16 device, u8 *asc, u8 *ascq)
{
u8 buffer[18];
u8 atacmd[12];
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_FARPTR(GET_SEG(SS), (u32)buffer));
if (ret != 0)
return ret;
*asc = buffer[12];
*ascq = buffer[13];
return 0;
}
static int
atapi_is_ready(u16 device)
{
if (GET_EBDA(ata.devices[device].type) != ATA_TYPE_ATAPI) {
printf("not implemented for non-ATAPI device\n");
return -1;
}
dprintf(6, "ata_detect_medium: begin\n");
u8 packet[12];
memset(packet, 0, sizeof(packet));
packet[0] = 0x25; /* READ CAPACITY */
/* Retry READ CAPACITY 50 times unless MEDIUM NOT PRESENT
* is reported by the device. If the device reports "IN PROGRESS",
* 30 seconds is added. */
u8 buf[8];
u32 timeout = 5000;
u32 time = 0;
u8 in_progress = 0;
for (;; time+=100) {
if (time >= timeout) {
dprintf(1, "read capacity failed\n");
return -1;
}
int ret = ata_cmd_packet(device, packet, sizeof(packet), sizeof(buf)
, MAKE_FARPTR(GET_SEG(SS), (u32)buf));
if (ret == 0)
break;
u8 asc=0, ascq=0;
ret = atapi_get_sense(device, &asc, &ascq);
if (!ret)
continue;
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 */
timeout = 30000;
in_progress = 1;
}
}
u32 block_len = (u32) buf[4] << 24
| (u32) buf[5] << 16
| (u32) buf[6] << 8
| (u32) buf[7] << 0;
if (block_len != 2048 && block_len != 512) {
printf("Unsupported sector size %u\n", block_len);
return -1;
}
SET_EBDA(ata.devices[device].blksize, block_len);
u32 sectors = (u32) buf[0] << 24
| (u32) buf[1] << 16
| (u32) buf[2] << 8
| (u32) buf[3] << 0;
dprintf(6, "sectors=%u\n", sectors);
if (block_len == 2048)
sectors <<= 2; /* # of sectors in 512-byte "soft" sector */
if (sectors != GET_EBDA(ata.devices[device].sectors))
printf("%dMB medium detected\n", sectors>>(20-9));
SET_EBDA(ata.devices[device].sectors, sectors);
return 0;
}
static int
atapi_is_cdrom(u8 device)
{
if (device >= CONFIG_MAX_ATA_DEVICES)
return 0;
if (GET_EBDA(ata.devices[device].type) != ATA_TYPE_ATAPI)
return 0;
if (GET_EBDA(ata.devices[device].device) != ATA_DEVICE_CDROM)
return 0;
return 1;
}
// Compare a string on the stack to one in the code segment.
static int
streq_cs(u8 *s1, char *cs_s2)
{
u8 *s2 = (u8*)cs_s2;
for (;;) {
if (*s1 != GET_VAR(CS, *s2))
return 0;
if (! *s1)
return 1;
s1++;
s2++;
}
}
int
cdrom_boot()
{
// Find out the first cdrom
u8 device;
for (device=0; device<CONFIG_MAX_ATA_DEVICES; device++)
if (atapi_is_cdrom(device))
break;
int ret = atapi_is_ready(device);
if (ret)
dprintf(1, "ata_is_ready returned %d\n", ret);
// if not found
if (device >= CONFIG_MAX_ATA_DEVICES)
return 2;
// Read the Boot Record Volume Descriptor
u8 buffer[2048];
ret = cdrom_read(device, 0x11, 1
, MAKE_FARPTR(GET_SEG(SS), (u32)buffer));
if (ret)
return 3;
// Validity checks
if (buffer[0])
return 4;
if (!streq_cs(&buffer[1], "CD001\001EL TORITO SPECIFICATION"))
return 5;
// ok, now we calculate the Boot catalog address
u32 lba = *(u32*)&buffer[0x47];
// And we read the Boot Catalog
ret = cdrom_read(device, lba, 1
, MAKE_FARPTR(GET_SEG(SS), (u32)buffer));
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
u8 media = buffer[0x21];
SET_EBDA(cdemu.media, media);
SET_EBDA(cdemu.controller_index, device/2);
SET_EBDA(cdemu.device_spec, device%2);
u16 boot_segment = *(u16*)&buffer[0x22];
if (!boot_segment)
boot_segment = 0x07C0;
SET_EBDA(cdemu.load_segment, boot_segment);
SET_EBDA(cdemu.buffer_segment, 0x0000);
u16 nbsectors = *(u16*)&buffer[0x26];
SET_EBDA(cdemu.sector_count, nbsectors);
lba = *(u32*)&buffer[0x28];
SET_EBDA(cdemu.ilba, lba);
// And we read the image in memory
ret = cdrom_read_emu(device, 0, nbsectors, MAKE_FARPTR(boot_segment, 0));
if (ret)
return 12;
if (media == 0) {
// No emulation requested - return success.
// FIXME ElTorito Hardcoded. cdrom is hardcoded as device 0xE0.
// Win2000 cd boot needs to know it booted from cd
SET_EBDA(cdemu.emulated_drive, 0xE0);
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_EBDA(cdemu.emulated_drive, 0x00);
SETBITS_BDA(equipment_list_flags, 0x41);
} else {
// Harddrive emulation
SET_EBDA(cdemu.emulated_drive, 0x80);
SET_EBDA(ata.hdcount, GET_EBDA(ata.hdcount) + 1);
}
// Remember the media type
switch (media) {
case 0x01: // 1.2M floppy
SET_EBDA(cdemu.vdevice.spt, 15);
SET_EBDA(cdemu.vdevice.cylinders, 80);
SET_EBDA(cdemu.vdevice.heads, 2);
break;
case 0x02: // 1.44M floppy
SET_EBDA(cdemu.vdevice.spt, 18);
SET_EBDA(cdemu.vdevice.cylinders, 80);
SET_EBDA(cdemu.vdevice.heads, 2);
break;
case 0x03: // 2.88M floppy
SET_EBDA(cdemu.vdevice.spt, 36);
SET_EBDA(cdemu.vdevice.cylinders, 80);
SET_EBDA(cdemu.vdevice.heads, 2);
break;
case 0x04: { // Harddrive
u16 spt = GET_FARVAR(boot_segment,*(u8*)(446+6));
u16 cyl = (spt << 2) + GET_FARVAR(boot_segment,*(u8*)(446+7)) + 1;
u16 heads = GET_FARVAR(boot_segment,*(u8*)(446+5)) + 1;
SET_EBDA(cdemu.vdevice.spt, spt & 0x3f);
SET_EBDA(cdemu.vdevice.cylinders, cyl);
SET_EBDA(cdemu.vdevice.heads, heads);
break;
}
}
// everything is ok, so from now on, the emulation is active
SET_EBDA(cdemu.active, 0x01);
dprintf(6, "cdemu media=%d\n", media);
return 0;
}