#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
/****************************************************************
static void
cdrom_1349(struct bregs *regs, u8 device)
{
+ set_fail(regs);
// always send changed ??
regs->ah = DISK_RET_ECHANGED;
- set_cf(regs, 1);
}
static void
* CD emulation
****************************************************************/
-// read disk sectors
-static void
-cdemu_1302(struct bregs *regs, u8 device)
+// 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)
{
- 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);
+ u32 ilba = GET_EBDA(cdemu.ilba);
+ return cdrom_read_512(biosid, ilba * 4 + vlba, count, far_buffer);
}
// read disk drive parameters
regs->bl = media * 2;
regs->es = SEG_BIOS;
- regs->di = (u16)&diskette_param_table2;
+ regs->di = (u32)&diskette_param_table2;
disk_ret(regs, DISK_RET_SUCCESS);
}
device += GET_EBDA(cdemu.device_spec);
switch (regs->ah) {
- case 0x02: cdemu_1302(regs, device); break;
- case 0x04: cdemu_1304(regs, device); break;
+ // 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;
- // XXX - All other calls get passed to standard CDROM functions.
- default: cdrom_13(regs, device); break;
+
+ default: disk_13XX(regs, device); break;
}
}
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;
+ if (device >= CONFIG_MAX_ATA_DEVICES)
+ // cdrom not found
+ return 2;
+
+ int ret = atapi_is_ready(device);
+ if (ret)
+ dprintf(1, "atapi_is_ready returned %d\n", ret);
+
+ // 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;
+}
projects / seabios.git / blobdiff