// 16bit code to access cdrom drives.
//
-// 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 LGPLv3 license.
#include "util.h" // memset
#include "bregs.h" // struct bregs
#include "biosvar.h" // GET_EBDA
-#include "atabits.h" // ATA_TYPE_ATAPI
+#include "ata.h" // ATA_CMD_REQUEST_SENSE
/****************************************************************
* 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.cylinders) - 1;
- u16 nlh = GET_EBDA2(ebda_seg, cdemu.heads) - 1;
- u16 nlspt = GET_EBDA2(ebda_seg, cdemu.spt);
+ 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->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
device += GET_EBDA2(ebda_seg, cdemu.device_spec);
switch (regs->ah) {
- // These functions are the same as for hard disks
- case 0x02:
- case 0x04:
- disk_13(regs, device);
- break;
+ 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:
cdrom_13(regs, device);
break;
- case 0x08: cdemu_1308(regs, device); break;
-
default: disk_13XX(regs, device); break;
}
}
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.cylinders));
- SET_INT13ET(regs, sectors, GET_EBDA2(ebda_seg, cdemu.spt));
- SET_INT13ET(regs, heads, GET_EBDA2(ebda_seg, cdemu.heads));
+ 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) {
// Request SENSE
static int
-atapi_get_sense(u16 device, u8 *asc, u8 *ascq)
+atapi_get_sense(int device, u8 *asc, u8 *ascq)
{
- u8 buffer[18];
- u8 atacmd[12];
+ 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 != 0)
+ if (ret)
return ret;
*asc = buffer[12];
return 0;
}
+// Request capacity
static int
-atapi_is_ready(u16 device)
+atapi_read_capacity(int device, u32 *blksize, u32 *sectors)
{
- if (GET_GLOBAL(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];
+ 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 50 times unless MEDIUM NOT PRESENT
- * is reported by the device. If the device reports "IN PROGRESS",
+ /* 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. */
- u8 buf[8];
- u32 timeout = 5000;
- u32 time = 0;
- u8 in_progress = 0;
- for (;; time+=100) {
- if (time >= timeout) {
+ 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 = ata_cmd_packet(device, packet, sizeof(packet), sizeof(buf)
- , MAKE_FLATPTR(GET_SEG(SS), buf));
- if (ret == 0)
+
+ int ret = atapi_read_capacity(device, &blksize, §ors);
+ if (!ret)
+ // Success
break;
- u8 asc=0, ascq=0;
+ u8 asc, ascq;
ret = atapi_get_sense(device, &asc, &ascq);
- if (!ret)
+ if (ret)
+ // Error - retry.
continue;
+ // Sense succeeded.
if (asc == 0x3a) { /* MEDIUM NOT PRESENT */
dprintf(1, "Device reports MEDIUM NOT PRESENT\n");
return -1;
/* IN PROGRESS OF BECOMING READY */
printf("Waiting for device to detect medium... ");
/* Allow 30 seconds more */
- timeout = 30000;
+ end = calc_future_tsc(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 != GET_GLOBAL(ATA.devices[device].blksize)) {
- printf("Unsupported sector size %u\n", block_len);
+ if (blksize != GET_GLOBAL(Drives.drives[device].blksize)) {
+ printf("Unsupported sector size %u\n", blksize);
return -1;
}
- u32 sectors = (u32) buf[0] << 24
- | (u32) buf[1] << 16
- | (u32) buf[2] << 8
- | (u32) buf[3] << 0;
-
dprintf(6, "sectors=%u\n", sectors);
printf("%dMB medium detected\n", sectors>>(20-11));
return 0;
}
-static int
-atapi_is_cdrom(u8 device)
-{
- if (device >= CONFIG_MAX_ATA_DEVICES)
- return 0;
-
- if (GET_GLOBAL(ATA.devices[device].type) != ATA_TYPE_ATAPI)
- return 0;
-
- if (GET_GLOBAL(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_GLOBAL(*s2))
- return 0;
- if (! *s1)
- return 1;
- s1++;
- s2++;
- }
-}
-
int
-cdrom_boot()
+cdrom_boot(int cdid)
{
- // Find out the first cdrom
- u8 device;
- for (device=0; device<CONFIG_MAX_ATA_DEVICES; device++)
- if (atapi_is_cdrom(device))
- break;
- if (device >= CONFIG_MAX_ATA_DEVICES)
- // cdrom not found
- return 2;
+ // Verify device is a cdrom.
+ if (cdid >= Drives.cdcount)
+ return 1;
+ int driveid = GET_GLOBAL(Drives.idmap[1][cdid]);
- int ret = atapi_is_ready(device);
+ 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;
- dop.driveid = device;
+ memset(&dop, 0, sizeof(dop));
+ dop.driveid = driveid;
dop.lba = 0x11;
dop.count = 1;
dop.buf_fl = MAKE_FLATPTR(GET_SEG(SS), buffer);
// 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
u8 media = buffer[0x21];
SET_EBDA2(ebda_seg, cdemu.media, media);
- SET_EBDA2(ebda_seg, cdemu.controller_index, device/2);
- SET_EBDA2(ebda_seg, cdemu.device_spec, device%2);
+ 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)
SET_EBDA2(ebda_seg, cdemu.ilba, lba);
// And we read the image in memory
- dop.lba = lba * 4;
- dop.count = nbsectors;
+ dop.lba = lba;
+ dop.count = DIV_ROUND_UP(nbsectors, 4);
dop.buf_fl = MAKE_FLATPTR(boot_segment, 0);
- ret = cdrom_read_512(&dop);
+ ret = cdrom_read(&dop);
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_EBDA2(ebda_seg, cdemu.emulated_drive, 0xE0);
-
+ SET_EBDA2(ebda_seg, cdemu.emulated_drive, 0xE0 + cdid);
return 0;
}
switch (media) {
case 0x01: // 1.2M floppy
- SET_EBDA2(ebda_seg, cdemu.spt, 15);
- SET_EBDA2(ebda_seg, cdemu.cylinders, 80);
- SET_EBDA2(ebda_seg, cdemu.heads, 2);
+ 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.spt, 18);
- SET_EBDA2(ebda_seg, cdemu.cylinders, 80);
- SET_EBDA2(ebda_seg, cdemu.heads, 2);
+ 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.spt, 36);
- SET_EBDA2(ebda_seg, cdemu.cylinders, 80);
- SET_EBDA2(ebda_seg, cdemu.heads, 2);
+ 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 {
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.spt, sptcyl & 0x3f);
- SET_EBDA2(ebda_seg, cdemu.cylinders, ((sptcyl<<2)&0x300) + cyllow + 1);
- SET_EBDA2(ebda_seg, cdemu.heads, heads + 1);
+ 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
projects / seabios.git / blobdiff