#include "util.h" // memset
#include "ata.h" // ATA_CMD_READ_SECTORS
+#define DEBUGF1(fmt, args...) bprintf(0, fmt , ##args)
+#define DEBUGF(fmt, args...)
+
/****************************************************************
* CDROM functions
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
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)
+ , 0, sizeof(buffer)
+ , MAKE_32_PTR(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, sizeof(buf)
+ , MAKE_32_PTR(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)
+{
+ 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);
+ if (ret)
+ BX_INFO("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, 2048
+ , MAKE_32_PTR(GET_SEG(SS), (u32)buffer), 0);
+ 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, 2048
+ , MAKE_32_PTR(GET_SEG(SS), (u32)buffer), 0);
+ 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
+
+ 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);
+
+ 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(device, lba, nbsectors*512
+ , MAKE_32_PTR(boot_segment, 0), 0);
+ 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 (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);
+ // everything is ok, so from now on, the emulation is active
+ SET_EBDA(cdemu.active, 0x01);
+ }
+
+ DEBUGF("cdemu media=%d active=%d\n"
+ , GET_EBDA(cdemu.media), GET_EBDA(cdemu.active));
+
+ return 0;
+}
projects / seabios.git / blobdiff