-// 16bit code to access cdrom drives.
+// Support for booting from cdroms (the "El Torito" spec).
//
-// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
+// Copyright (C) 2008,2009 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.
+// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "disk.h" // cdrom_13
#include "util.h" // memset
-#include "ata.h" // ATA_CMD_READ_SECTORS
-
-#define DEBUGF1(fmt, args...) bprintf(0, fmt , ##args)
-#define DEBUGF(fmt, args...)
+#include "bregs.h" // struct bregs
+#include "biosvar.h" // GET_EBDA
+#include "ata.h" // ATA_CMD_REQUEST_SENSE
+#include "blockcmd.h" // CDB_CMD_REQUEST_SENSE
/****************************************************************
- * CDROM functions
+ * CD emulation
****************************************************************/
-// 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);
-}
+struct drive_s *cdemu_drive_gf VAR16VISIBLE;
-// unlock
-static void
-cdrom_134501(struct bregs *regs, u8 device)
+static int
+cdemu_read(struct disk_op_s *op)
{
- u8 locks = GET_EBDA(ata.devices[device].lock);
- if (locks == 0x00) {
- regs->al = 0;
- disk_ret(regs, DISK_RET_ENOTLOCKED);
- return;
+ u16 ebda_seg = get_ebda_seg();
+ struct drive_s *drive_g;
+ drive_g = GLOBALFLAT2GLOBAL(GET_EBDA2(ebda_seg, cdemu.emulated_drive_gf));
+ struct disk_op_s dop;
+ dop.drive_g = drive_g;
+ dop.command = op->command;
+ dop.lba = GET_EBDA2(ebda_seg, cdemu.ilba) + op->lba / 4;
+
+ int count = op->count;
+ op->count = 0;
+ u8 *cdbuf_fl = GET_GLOBAL(bounce_buf_fl);
+
+ if (op->lba & 3) {
+ // Partial read of first block.
+ dop.count = 1;
+ dop.buf_fl = cdbuf_fl;
+ int ret = process_op(&dop);
+ if (ret)
+ return ret;
+ u8 thiscount = 4 - (op->lba & 3);
+ if (thiscount > count)
+ thiscount = count;
+ count -= thiscount;
+ memcpy_fl(op->buf_fl, cdbuf_fl + (op->lba & 3) * 512, thiscount * 512);
+ op->buf_fl += thiscount * 512;
+ op->count += thiscount;
+ dop.lba++;
}
- 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;
+ if (count > 3) {
+ // Read n number of regular blocks.
+ dop.count = count / 4;
+ dop.buf_fl = op->buf_fl;
+ int ret = process_op(&dop);
+ op->count += dop.count * 4;
+ if (ret)
+ return ret;
+ u8 thiscount = count & ~3;
+ count &= 3;
+ op->buf_fl += thiscount * 512;
+ dop.lba += thiscount / 4;
}
-}
-// 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;
+ if (count) {
+ // Partial read on last block.
+ dop.count = 1;
+ dop.buf_fl = cdbuf_fl;
+ int ret = process_op(&dop);
+ if (ret)
+ return ret;
+ u8 thiscount = count;
+ memcpy_fl(op->buf_fl, cdbuf_fl, thiscount * 512);
+ op->count += thiscount;
}
- // 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)
-{
- // always send changed ??
- regs->ah = DISK_RET_ECHANGED;
- set_cf(regs, 1);
-}
-
-static void
-cdrom_ok(struct bregs *regs, u8 device)
-{
- disk_ret(regs, DISK_RET_SUCCESS);
+ return DISK_RET_SUCCESS;
}
-static void
-cdrom_wp(struct bregs *regs, u8 device)
+int
+process_cdemu_op(struct disk_op_s *op)
{
- disk_ret(regs, DISK_RET_EWRITEPROTECT);
-}
+ if (!CONFIG_CDROM_EMU)
+ return 0;
-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;
+ switch (op->command) {
+ case CMD_READ:
+ return cdemu_read(op);
+ case CMD_WRITE:
+ case CMD_FORMAT:
+ return DISK_RET_EWRITEPROTECT;
+ case CMD_VERIFY:
+ case CMD_RESET:
+ case CMD_SEEK:
+ case CMD_ISREADY:
+ return DISK_RET_SUCCESS;
+ default:
+ op->count = 0;
+ return DISK_RET_EPARAM;
}
}
-
-/****************************************************************
- * 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);
-}
-
void
-cdemu_13(struct bregs *regs)
+cdemu_setup(void)
{
- //debug_stub(regs);
-
- u8 device = GET_EBDA(cdemu.controller_index) * 2;
- device += GET_EBDA(cdemu.device_spec);
+ if (!CONFIG_CDROM_EMU)
+ return;
+ if (!CDCount)
+ return;
+ if (bounce_buf_init() < 0)
+ return;
- 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 drive_s *drive_g = malloc_fseg(sizeof(*drive_g));
+ if (!drive_g) {
+ warn_noalloc();
+ free(drive_g);
+ return;
}
+ cdemu_drive_gf = drive_g;
+ memset(drive_g, 0, sizeof(*drive_g));
+ drive_g->type = DTYPE_CDEMU;
+ drive_g->blksize = DISK_SECTOR_SIZE;
+ drive_g->sectors = (u64)-1;
}
struct eltorito_s {
cdemu_134b(struct bregs *regs)
{
// FIXME ElTorito Hardcoded
+ u16 ebda_seg = get_ebda_seg();
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));
+ SET_INT13ET(regs, media, GET_EBDA2(ebda_seg, cdemu.media));
+ SET_INT13ET(regs, emulated_drive
+ , GET_EBDA2(ebda_seg, cdemu.emulated_extdrive));
+ struct drive_s *drive_gf = GET_EBDA2(ebda_seg, cdemu.emulated_drive_gf);
+ u8 cntl_id = 0;
+ if (drive_gf)
+ cntl_id = GET_GLOBALFLAT(drive_gf->cntl_id);
+ SET_INT13ET(regs, controller_index, cntl_id / 2);
+ SET_INT13ET(regs, device_spec, cntl_id % 2);
+ SET_INT13ET(regs, ilba, GET_EBDA2(ebda_seg, cdemu.ilba));
+ 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_EBDA(cdemu.active, 0x00); // bye bye
+ SET_EBDA2(ebda_seg, cdemu.active, 0x00); // bye bye
+
+ // XXX - update floppy/hd count.
}
disk_ret(regs, DISK_RET_SUCCESS);
* CD booting
****************************************************************/
-// Request SENSE
-static u16
-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);
- u16 ret = ata_cmd_packet(device, atacmd, sizeof(atacmd)
- , 18L, 0, ATA_DATA_IN, GET_SEG(SS), (u32)buffer);
- if (ret != 0)
- return 0x0002;
-
- *asc = buffer[12];
- *ascq = buffer[13];
-
- return 0;
-}
-
-static u16
-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;
- }
-
- DEBUGF("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) {
- DEBUGF("read capacity failed\n");
- return -1;
- }
- u16 ret = ata_cmd_packet(device, packet, sizeof(packet)
- , 0, 8L, ATA_DATA_IN, 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 */
- DEBUGF("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;
-
- DEBUGF("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 u16
-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)
+int
+cdrom_boot(struct drive_s *drive_g)
{
- u8 *s2 = (u8*)cs_s2;
- for (;;) {
- if (*s1 != GET_VAR(CS, *s2))
- return 0;
- if (! *s1)
- return 1;
- s1++;
- s2++;
- }
-}
-
-u16
-cdrom_boot()
-{
- // Find out the first cdrom
- u8 device;
- for (device=0; device<CONFIG_MAX_ATA_DEVICES; device++)
- if (atapi_is_cdrom(device))
- break;
-
- u16 ret = atapi_is_ready(device);
+ struct disk_op_s dop;
+ int cdid = getDriveId(EXTTYPE_CD, drive_g);
+ memset(&dop, 0, sizeof(dop));
+ dop.drive_g = drive_g;
+ if (!dop.drive_g || cdid < 0)
+ return 1;
+
+ int ret = scsi_is_ready(&dop);
if (ret)
- BX_INFO("ata_is_ready returned %d\n", ret);
-
- // if not found
- if (device >= CONFIG_MAX_ATA_DEVICES)
- return 2;
+ dprintf(1, "scsi_is_ready returned %d\n", ret);
// Read the Boot Record Volume Descriptor
u8 buffer[2048];
- ret = cdrom_read(device, 0x11, 2048, GET_SEG(SS), (u32)buffer, 0);
+ dop.lba = 0x11;
+ dop.count = 1;
+ dop.buf_fl = MAKE_FLATPTR(GET_SEG(SS), buffer);
+ ret = cdb_read(&dop);
if (ret)
return 3;
// Validity checks
if (buffer[0])
return 4;
- if (!streq_cs(&buffer[1], "CD001\001EL TORITO SPECIFICATION"))
+ 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
- ret = cdrom_read(device, lba, 2048, GET_SEG(SS), (u32)buffer, 0);
+ dop.lba = lba;
+ dop.count = 1;
+ ret = cdb_read(&dop);
if (ret)
return 7;
if (buffer[0x20] != 0x88)
return 11; // Bootable
- SET_EBDA(cdemu.media,buffer[0x21]);
- if (buffer[0x21] == 0)
- // 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);
- else if (buffer[0x21] < 4)
- SET_EBDA(cdemu.emulated_drive, 0x00);
- else
- SET_EBDA(cdemu.emulated_drive, 0x80);
+ u16 ebda_seg = get_ebda_seg();
+ u8 media = buffer[0x21];
+ SET_EBDA2(ebda_seg, cdemu.media, media);
- SET_EBDA(cdemu.controller_index, device/2);
- SET_EBDA(cdemu.device_spec, device%2);
+ SET_EBDA2(ebda_seg, cdemu.emulated_drive_gf, dop.drive_g);
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);
+ SET_EBDA2(ebda_seg, cdemu.load_segment, boot_segment);
+ SET_EBDA2(ebda_seg, cdemu.buffer_segment, 0x0000);
u16 nbsectors = *(u16*)&buffer[0x26];
- SET_EBDA(cdemu.sector_count, nbsectors);
+ SET_EBDA2(ebda_seg, cdemu.sector_count, nbsectors);
lba = *(u32*)&buffer[0x28];
- SET_EBDA(cdemu.ilba, lba);
+ SET_EBDA2(ebda_seg, cdemu.ilba, lba);
// And we read the image in memory
- ret = cdrom_read(device, lba, nbsectors*512
- , boot_segment, 0, 0);
+ dop.lba = lba;
+ dop.count = DIV_ROUND_UP(nbsectors, 4);
+ dop.buf_fl = MAKE_FLATPTR(boot_segment, 0);
+ ret = cdb_read(&dop);
if (ret)
return 12;
- // Remember the media type
- switch (GET_EBDA(cdemu.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;
- }
+ if (media == 0) {
+ // No emulation requested - return success.
+ SET_EBDA2(ebda_seg, cdemu.emulated_extdrive, EXTSTART_CD + cdid);
+ return 0;
}
- if (GET_EBDA(cdemu.media) != 0) {
- // Increase bios installed hardware number of devices
- if (GET_EBDA(cdemu.emulated_drive) == 0x00)
- SETBITS_BDA(equipment_list_flags, 0x41);
- else
- SET_EBDA(ata.hdcount, GET_EBDA(ata.hdcount) + 1);
+ // Emulation of a floppy/harddisk requested
+ if (! CONFIG_CDROM_EMU || !cdemu_drive_gf)
+ 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_extdrive, 0x00);
+ // XXX - get and set actual floppy count.
+ 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_extdrive, 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
- if (GET_EBDA(cdemu.media))
- SET_EBDA(cdemu.active, 0x01);
+ SET_EBDA2(ebda_seg, cdemu.active, 0x01);
+ dprintf(6, "cdemu media=%d\n", media);
return 0;
}
projects / seabios.git / blobdiff