--- /dev/null
+// 16bit code to access hard 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 LGPLv3 license.
+
+#include "disk.h" // floppy_13
+#include "biosvar.h" // SET_BDA
+#include "config.h" // CONFIG_*
+#include "util.h" // debug_enter
+#include "pic.h" // eoi_pic2
+#include "bregs.h" // struct bregs
+#include "pci.h" // pci_bdf_to_bus
+#include "ata.h" // ATA_CB_DC
+
+
+/****************************************************************
+ * Helper functions
+ ****************************************************************/
+
+void
+__disk_ret(struct bregs *regs, u32 linecode, const char *fname)
+{
+ u8 code = linecode;
+ if (regs->dl < EXTSTART_HD)
+ SET_BDA(floppy_last_status, code);
+ else
+ SET_BDA(disk_last_status, code);
+ if (code)
+ __set_code_invalid(regs, linecode, fname);
+ else
+ set_code_success(regs);
+}
+
+void
+__disk_ret_unimplemented(struct bregs *regs, u32 linecode, const char *fname)
+{
+ u8 code = linecode;
+ if (regs->dl < EXTSTART_HD)
+ SET_BDA(floppy_last_status, code);
+ else
+ SET_BDA(disk_last_status, code);
+ __set_code_unimplemented(regs, linecode, fname);
+}
+
+static void
+__disk_stub(struct bregs *regs, int lineno, const char *fname)
+{
+ __warn_unimplemented(regs, lineno, fname);
+ __disk_ret(regs, DISK_RET_SUCCESS | (lineno << 8), fname);
+}
+
+#define DISK_STUB(regs) \
+ __disk_stub((regs), __LINE__, __func__)
+
+// Get the cylinders/heads/sectors for the given drive.
+static void
+fillLCHS(struct drive_s *drive_g, u16 *nlc, u16 *nlh, u16 *nlspt)
+{
+ if (CONFIG_CDROM_EMU
+ && drive_g == GLOBALFLAT2GLOBAL(GET_GLOBAL(cdemu_drive_gf))) {
+ // Emulated drive - get info from ebda. (It's not possible to
+ // populate the geometry directly in the driveid because the
+ // geometry is only known after the bios segment is made
+ // read-only).
+ u16 ebda_seg = get_ebda_seg();
+ *nlc = GET_EBDA2(ebda_seg, cdemu.lchs.cylinders);
+ *nlh = GET_EBDA2(ebda_seg, cdemu.lchs.heads);
+ *nlspt = GET_EBDA2(ebda_seg, cdemu.lchs.spt);
+ return;
+ }
+ *nlc = GET_GLOBAL(drive_g->lchs.cylinders);
+ *nlh = GET_GLOBAL(drive_g->lchs.heads);
+ *nlspt = GET_GLOBAL(drive_g->lchs.spt);
+}
+
+// Perform read/write/verify using old-style chs accesses
+static void
+basic_access(struct bregs *regs, struct drive_s *drive_g, u16 command)
+{
+ struct disk_op_s dop;
+ dop.drive_g = drive_g;
+ dop.command = command;
+
+ u8 count = regs->al;
+ u16 cylinder = regs->ch | ((((u16)regs->cl) << 2) & 0x300);
+ u16 sector = regs->cl & 0x3f;
+ u16 head = regs->dh;
+
+ if (count > 128 || count == 0 || sector == 0) {
+ warn_invalid(regs);
+ disk_ret(regs, DISK_RET_EPARAM);
+ return;
+ }
+ dop.count = count;
+
+ u16 nlc, nlh, nlspt;
+ fillLCHS(drive_g, &nlc, &nlh, &nlspt);
+
+ // sanity check on cyl heads, sec
+ if (cylinder >= nlc || head >= nlh || sector > nlspt) {
+ warn_invalid(regs);
+ disk_ret(regs, DISK_RET_EPARAM);
+ return;
+ }
+
+ // translate lchs to lba
+ dop.lba = (((((u32)cylinder * (u32)nlh) + (u32)head) * (u32)nlspt)
+ + (u32)sector - 1);
+
+ dop.buf_fl = MAKE_FLATPTR(regs->es, regs->bx);
+
+ int status = send_disk_op(&dop);
+
+ regs->al = dop.count;
+
+ disk_ret(regs, status);
+}
+
+// Perform read/write/verify using new-style "int13ext" accesses.
+static void
+extended_access(struct bregs *regs, struct drive_s *drive_g, u16 command)
+{
+ struct disk_op_s dop;
+ // Get lba and check.
+ dop.lba = GET_INT13EXT(regs, lba);
+ dop.command = command;
+ dop.drive_g = drive_g;
+ if (dop.lba >= GET_GLOBAL(drive_g->sectors)) {
+ warn_invalid(regs);
+ disk_ret(regs, DISK_RET_EPARAM);
+ return;
+ }
+
+ dop.buf_fl = SEGOFF_TO_FLATPTR(GET_INT13EXT(regs, data));
+ dop.count = GET_INT13EXT(regs, count);
+
+ int status = send_disk_op(&dop);
+
+ SET_INT13EXT(regs, count, dop.count);
+
+ disk_ret(regs, status);
+}
+
+
+/****************************************************************
+ * Hard Drive functions
+ ****************************************************************/
+
+// disk controller reset
+static void
+disk_1300(struct bregs *regs, struct drive_s *drive_g)
+{
+ struct disk_op_s dop;
+ dop.drive_g = drive_g;
+ dop.command = CMD_RESET;
+ int status = send_disk_op(&dop);
+ disk_ret(regs, status);
+}
+
+// read disk status
+static void
+disk_1301(struct bregs *regs, struct drive_s *drive_g)
+{
+ u8 v;
+ if (regs->dl < EXTSTART_HD)
+ // Floppy
+ v = GET_BDA(floppy_last_status);
+ else
+ v = GET_BDA(disk_last_status);
+ regs->ah = v;
+ set_cf(regs, v);
+ // XXX - clear disk_last_status?
+}
+
+// read disk sectors
+static void
+disk_1302(struct bregs *regs, struct drive_s *drive_g)
+{
+ basic_access(regs, drive_g, CMD_READ);
+}
+
+// write disk sectors
+static void
+disk_1303(struct bregs *regs, struct drive_s *drive_g)
+{
+ basic_access(regs, drive_g, CMD_WRITE);
+}
+
+// verify disk sectors
+static void
+disk_1304(struct bregs *regs, struct drive_s *drive_g)
+{
+ basic_access(regs, drive_g, CMD_VERIFY);
+}
+
+// format disk track
+static void
+disk_1305(struct bregs *regs, struct drive_s *drive_g)
+{
+ debug_stub(regs);
+
+ u16 nlc, nlh, nlspt;
+ fillLCHS(drive_g, &nlc, &nlh, &nlspt);
+
+ u8 num_sectors = regs->al;
+ u8 head = regs->dh;
+
+ if (head >= nlh || num_sectors == 0 || num_sectors > nlspt) {
+ disk_ret(regs, DISK_RET_EPARAM);
+ return;
+ }
+
+ struct disk_op_s dop;
+ dop.drive_g = drive_g;
+ dop.command = CMD_FORMAT;
+ dop.lba = head;
+ dop.count = num_sectors;
+ dop.buf_fl = MAKE_FLATPTR(regs->es, regs->bx);
+ int status = send_disk_op(&dop);
+ disk_ret(regs, status);
+}
+
+// read disk drive parameters
+static void
+disk_1308(struct bregs *regs, struct drive_s *drive_g)
+{
+ u16 ebda_seg = get_ebda_seg();
+ // Get logical geometry from table
+ u16 nlc, nlh, nlspt;
+ fillLCHS(drive_g, &nlc, &nlh, &nlspt);
+ nlc--;
+ nlh--;
+ u8 count;
+ if (regs->dl < EXTSTART_HD) {
+ // Floppy
+ count = GET_GLOBAL(FloppyCount);
+
+ if (CONFIG_CDROM_EMU
+ && drive_g == GLOBALFLAT2GLOBAL(GET_GLOBAL(cdemu_drive_gf)))
+ regs->bx = GET_EBDA2(ebda_seg, cdemu.media) * 2;
+ else
+ regs->bx = GET_GLOBAL(drive_g->floppy_type);
+
+ // set es & di to point to 11 byte diskette param table in ROM
+ regs->es = SEG_BIOS;
+ regs->di = (u32)&diskette_param_table2;
+ } else if (regs->dl < EXTSTART_CD) {
+ // Hard drive
+ count = GET_BDA(hdcount);
+ nlc--; // last sector reserved
+ } else {
+ // Not supported on CDROM
+ disk_ret(regs, DISK_RET_EPARAM);
+ return;
+ }
+
+ if (CONFIG_CDROM_EMU && GET_EBDA2(ebda_seg, cdemu.active)) {
+ u8 emudrive = GET_EBDA2(ebda_seg, cdemu.emulated_extdrive);
+ if (((emudrive ^ regs->dl) & 0x80) == 0)
+ // Note extra drive due to emulation.
+ count++;
+ if (regs->dl < EXTSTART_HD && count > 2)
+ // Max of two floppy drives.
+ count = 2;
+ }
+
+ regs->al = 0;
+ regs->ch = nlc & 0xff;
+ regs->cl = ((nlc >> 2) & 0xc0) | (nlspt & 0x3f);
+ regs->dh = nlh;
+
+ disk_ret(regs, DISK_RET_SUCCESS);
+ regs->dl = count;
+}
+
+// initialize drive parameters
+static void
+disk_1309(struct bregs *regs, struct drive_s *drive_g)
+{
+ DISK_STUB(regs);
+}
+
+// seek to specified cylinder
+static void
+disk_130c(struct bregs *regs, struct drive_s *drive_g)
+{
+ DISK_STUB(regs);
+}
+
+// alternate disk reset
+static void
+disk_130d(struct bregs *regs, struct drive_s *drive_g)
+{
+ DISK_STUB(regs);
+}
+
+// check drive ready
+static void
+disk_1310(struct bregs *regs, struct drive_s *drive_g)
+{
+ // should look at 40:8E also???
+
+ struct disk_op_s dop;
+ dop.drive_g = drive_g;
+ dop.command = CMD_ISREADY;
+ int status = send_disk_op(&dop);
+ disk_ret(regs, status);
+}
+
+// recalibrate
+static void
+disk_1311(struct bregs *regs, struct drive_s *drive_g)
+{
+ DISK_STUB(regs);
+}
+
+// controller internal diagnostic
+static void
+disk_1314(struct bregs *regs, struct drive_s *drive_g)
+{
+ DISK_STUB(regs);
+}
+
+// read disk drive size
+static void
+disk_1315(struct bregs *regs, struct drive_s *drive_g)
+{
+ disk_ret(regs, DISK_RET_SUCCESS);
+ if (regs->dl < EXTSTART_HD || regs->dl >= EXTSTART_CD) {
+ // Floppy or cdrom
+ regs->ah = 1;
+ return;
+ }
+ // Hard drive
+
+ // Get logical geometry from table
+ u16 nlc, nlh, nlspt;
+ fillLCHS(drive_g, &nlc, &nlh, &nlspt);
+
+ // Compute sector count seen by int13
+ u32 lba = (u32)(nlc - 1) * (u32)nlh * (u32)nlspt;
+ regs->cx = lba >> 16;
+ regs->dx = lba & 0xffff;
+ regs->ah = 3; // hard disk accessible
+}
+
+static void
+disk_1316(struct bregs *regs, struct drive_s *drive_g)
+{
+ if (regs->dl >= EXTSTART_HD) {
+ // Hard drive
+ disk_ret(regs, DISK_RET_EPARAM);
+ return;
+ }
+ disk_ret(regs, DISK_RET_ECHANGED);
+}
+
+// IBM/MS installation check
+static void
+disk_1341(struct bregs *regs, struct drive_s *drive_g)
+{
+ regs->bx = 0xaa55; // install check
+ regs->cx = 0x0007; // ext disk access and edd, removable supported
+ disk_ret(regs, DISK_RET_SUCCESS);
+ regs->ah = 0x30; // EDD 3.0
+}
+
+// IBM/MS extended read
+static void
+disk_1342(struct bregs *regs, struct drive_s *drive_g)
+{
+ extended_access(regs, drive_g, CMD_READ);
+}
+
+// IBM/MS extended write
+static void
+disk_1343(struct bregs *regs, struct drive_s *drive_g)
+{
+ extended_access(regs, drive_g, CMD_WRITE);
+}
+
+// IBM/MS verify
+static void
+disk_1344(struct bregs *regs, struct drive_s *drive_g)
+{
+ extended_access(regs, drive_g, CMD_VERIFY);
+}
+
+// lock
+static void
+disk_134500(struct bregs *regs, struct drive_s *drive_g)
+{
+ u16 ebda_seg = get_ebda_seg();
+ int cdid = regs->dl - EXTSTART_CD;
+ u8 locks = GET_EBDA2(ebda_seg, cdrom_locks[cdid]);
+ if (locks == 0xff) {
+ regs->al = 1;
+ disk_ret(regs, DISK_RET_ETOOMANYLOCKS);
+ return;
+ }
+ SET_EBDA2(ebda_seg, cdrom_locks[cdid], locks + 1);
+ regs->al = 1;
+ disk_ret(regs, DISK_RET_SUCCESS);
+}
+
+// unlock
+static void
+disk_134501(struct bregs *regs, struct drive_s *drive_g)
+{
+ u16 ebda_seg = get_ebda_seg();
+ int cdid = regs->dl - EXTSTART_CD;
+ u8 locks = GET_EBDA2(ebda_seg, cdrom_locks[cdid]);
+ if (locks == 0x00) {
+ regs->al = 0;
+ disk_ret(regs, DISK_RET_ENOTLOCKED);
+ return;
+ }
+ locks--;
+ SET_EBDA2(ebda_seg, cdrom_locks[cdid], locks);
+ regs->al = (locks ? 1 : 0);
+ disk_ret(regs, DISK_RET_SUCCESS);
+}
+
+// status
+static void
+disk_134502(struct bregs *regs, struct drive_s *drive_g)
+{
+ int cdid = regs->dl - EXTSTART_CD;
+ u8 locks = GET_EBDA(cdrom_locks[cdid]);
+ regs->al = (locks ? 1 : 0);
+ disk_ret(regs, DISK_RET_SUCCESS);
+}
+
+static void
+disk_1345XX(struct bregs *regs, struct drive_s *drive_g)
+{
+ disk_ret_unimplemented(regs, DISK_RET_EPARAM);
+}
+
+// IBM/MS lock/unlock drive
+static void
+disk_1345(struct bregs *regs, struct drive_s *drive_g)
+{
+ if (regs->dl < EXTSTART_CD) {
+ // Always success for HD
+ disk_ret(regs, DISK_RET_SUCCESS);
+ return;
+ }
+
+ switch (regs->al) {
+ case 0x00: disk_134500(regs, drive_g); break;
+ case 0x01: disk_134501(regs, drive_g); break;
+ case 0x02: disk_134502(regs, drive_g); break;
+ default: disk_1345XX(regs, drive_g); break;
+ }
+}
+
+// IBM/MS eject media
+static void
+disk_1346(struct bregs *regs, struct drive_s *drive_g)
+{
+ if (regs->dl < EXTSTART_CD) {
+ // Volume Not Removable
+ disk_ret(regs, DISK_RET_ENOTREMOVABLE);
+ return;
+ }
+
+ int cdid = regs->dl - EXTSTART_CD;
+ u8 locks = GET_EBDA(cdrom_locks[cdid]);
+ 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;
+ br.dl = regs->dl;
+ 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 seek
+static void
+disk_1347(struct bregs *regs, struct drive_s *drive_g)
+{
+ extended_access(regs, drive_g, CMD_SEEK);
+}
+
+// IBM/MS get drive parameters
+static void
+disk_1348(struct bregs *regs, struct drive_s *drive_g)
+{
+ u16 size = GET_INT13DPT(regs, size);
+ u16 t13 = size == 74;
+
+ // Buffer is too small
+ if (size < 26) {
+ disk_ret(regs, DISK_RET_EPARAM);
+ return;
+ }
+
+ // EDD 1.x
+
+ u8 type = GET_GLOBAL(drive_g->type);
+ u16 npc = GET_GLOBAL(drive_g->pchs.cylinders);
+ u16 nph = GET_GLOBAL(drive_g->pchs.heads);
+ u16 npspt = GET_GLOBAL(drive_g->pchs.spt);
+ u64 lba = GET_GLOBAL(drive_g->sectors);
+ u16 blksize = GET_GLOBAL(drive_g->blksize);
+
+ dprintf(DEBUG_HDL_13, "disk_1348 size=%d t=%d chs=%d,%d,%d lba=%d bs=%d\n"
+ , size, type, npc, nph, npspt, (u32)lba, blksize);
+
+ SET_INT13DPT(regs, size, 26);
+ if (type == DTYPE_ATAPI) {
+ // 0x74 = removable, media change, lockable, max values
+ SET_INT13DPT(regs, infos, 0x74);
+ SET_INT13DPT(regs, cylinders, 0xffffffff);
+ SET_INT13DPT(regs, heads, 0xffffffff);
+ SET_INT13DPT(regs, spt, 0xffffffff);
+ SET_INT13DPT(regs, sector_count, (u64)-1);
+ } else {
+ if (lba > (u64)npspt*nph*0x3fff) {
+ SET_INT13DPT(regs, infos, 0x00); // geometry is invalid
+ SET_INT13DPT(regs, cylinders, 0x3fff);
+ } else {
+ SET_INT13DPT(regs, infos, 0x02); // geometry is valid
+ SET_INT13DPT(regs, cylinders, (u32)npc);
+ }
+ SET_INT13DPT(regs, heads, (u32)nph);
+ SET_INT13DPT(regs, spt, (u32)npspt);
+ SET_INT13DPT(regs, sector_count, lba);
+ }
+ SET_INT13DPT(regs, blksize, blksize);
+
+ if (size < 30 ||
+ (type != DTYPE_ATA && type != DTYPE_ATAPI && type != DTYPE_VIRTIO)) {
+ disk_ret(regs, DISK_RET_SUCCESS);
+ return;
+ }
+
+ // EDD 2.x
+
+ int bdf;
+ u16 iobase1 = 0;
+ u64 device_path = 0;
+ u8 channel = 0;
+ SET_INT13DPT(regs, size, 30);
+ if (type == DTYPE_ATA || type == DTYPE_ATAPI) {
+ u16 ebda_seg = get_ebda_seg();
+
+ SET_INT13DPT(regs, dpte_segment, ebda_seg);
+ SET_INT13DPT(regs, dpte_offset
+ , offsetof(struct extended_bios_data_area_s, dpte));
+
+ // Fill in dpte
+ struct atadrive_s *adrive_g = container_of(
+ drive_g, struct atadrive_s, drive);
+ struct ata_channel_s *chan_gf = GET_GLOBAL(adrive_g->chan_gf);
+ u8 slave = GET_GLOBAL(adrive_g->slave);
+ u16 iobase2 = GET_GLOBALFLAT(chan_gf->iobase2);
+ u8 irq = GET_GLOBALFLAT(chan_gf->irq);
+ iobase1 = GET_GLOBALFLAT(chan_gf->iobase1);
+ bdf = GET_GLOBALFLAT(chan_gf->pci_bdf);
+ device_path = slave;
+ channel = GET_GLOBALFLAT(chan_gf->chanid);
+
+ u16 options = 0;
+ if (type == DTYPE_ATA) {
+ u8 translation = GET_GLOBAL(drive_g->translation);
+ if (translation != TRANSLATION_NONE) {
+ options |= 1<<3; // CHS translation
+ if (translation == TRANSLATION_LBA)
+ options |= 1<<9;
+ if (translation == TRANSLATION_RECHS)
+ options |= 3<<9;
+ }
+ } else {
+ // ATAPI
+ options |= 1<<5; // removable device
+ options |= 1<<6; // atapi device
+ }
+ options |= 1<<4; // lba translation
+ if (CONFIG_ATA_PIO32)
+ options |= 1<<7;
+
+ SET_EBDA2(ebda_seg, dpte.iobase1, iobase1);
+ SET_EBDA2(ebda_seg, dpte.iobase2, iobase2 + ATA_CB_DC);
+ SET_EBDA2(ebda_seg, dpte.prefix, ((slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0)
+ | ATA_CB_DH_LBA));
+ SET_EBDA2(ebda_seg, dpte.unused, 0xcb);
+ SET_EBDA2(ebda_seg, dpte.irq, irq);
+ SET_EBDA2(ebda_seg, dpte.blkcount, 1);
+ SET_EBDA2(ebda_seg, dpte.dma, 0);
+ SET_EBDA2(ebda_seg, dpte.pio, 0);
+ SET_EBDA2(ebda_seg, dpte.options, options);
+ SET_EBDA2(ebda_seg, dpte.reserved, 0);
+ SET_EBDA2(ebda_seg, dpte.revision, 0x11);
+
+ u8 sum = checksum_far(
+ ebda_seg, (void*)offsetof(struct extended_bios_data_area_s, dpte), 15);
+ SET_EBDA2(ebda_seg, dpte.checksum, -sum);
+ } else {
+ SET_INT13DPT(regs, dpte_segment, 0);
+ SET_INT13DPT(regs, dpte_offset, 0);
+ bdf = GET_GLOBAL(drive_g->cntl_id);
+ }
+
+ if (size < 66) {
+ disk_ret(regs, DISK_RET_SUCCESS);
+ return;
+ }
+
+ // EDD 3.x
+ SET_INT13DPT(regs, key, 0xbedd);
+ SET_INT13DPT(regs, dpi_length, t13 ? 44 : 36);
+ SET_INT13DPT(regs, reserved1, 0);
+ SET_INT13DPT(regs, reserved2, 0);
+
+ if (bdf != -1) {
+ SET_INT13DPT(regs, host_bus[0], 'P');
+ SET_INT13DPT(regs, host_bus[1], 'C');
+ SET_INT13DPT(regs, host_bus[2], 'I');
+ SET_INT13DPT(regs, host_bus[3], ' ');
+
+ u32 path = (pci_bdf_to_bus(bdf) | (pci_bdf_to_dev(bdf) << 8)
+ | (pci_bdf_to_fn(bdf) << 16));
+ if (t13)
+ path |= channel << 24;
+
+ SET_INT13DPT(regs, iface_path, path);
+ } else {
+ // ISA
+ SET_INT13DPT(regs, host_bus[0], 'I');
+ SET_INT13DPT(regs, host_bus[1], 'S');
+ SET_INT13DPT(regs, host_bus[2], 'A');
+ SET_INT13DPT(regs, host_bus[3], ' ');
+
+ SET_INT13DPT(regs, iface_path, iobase1);
+ }
+
+ if (type != DTYPE_VIRTIO) {
+ SET_INT13DPT(regs, iface_type[0], 'A');
+ SET_INT13DPT(regs, iface_type[1], 'T');
+ SET_INT13DPT(regs, iface_type[2], 'A');
+ SET_INT13DPT(regs, iface_type[3], ' ');
+ } else {
+ SET_INT13DPT(regs, iface_type[0], 'S');
+ SET_INT13DPT(regs, iface_type[1], 'C');
+ SET_INT13DPT(regs, iface_type[2], 'S');
+ SET_INT13DPT(regs, iface_type[3], 'I');
+ }
+ SET_INT13DPT(regs, iface_type[4], ' ');
+ SET_INT13DPT(regs, iface_type[5], ' ');
+ SET_INT13DPT(regs, iface_type[6], ' ');
+ SET_INT13DPT(regs, iface_type[7], ' ');
+
+ if (t13) {
+ SET_INT13DPT(regs, t13.device_path[0], device_path);
+ SET_INT13DPT(regs, t13.device_path[1], 0);
+
+ SET_INT13DPT(regs, t13.checksum
+ , -checksum_far(regs->ds, (void*)(regs->si+30), 43));
+ } else {
+ SET_INT13DPT(regs, phoenix.device_path, device_path);
+
+ SET_INT13DPT(regs, phoenix.checksum
+ , -checksum_far(regs->ds, (void*)(regs->si+30), 35));
+ }
+
+ disk_ret(regs, DISK_RET_SUCCESS);
+}
+
+// IBM/MS extended media change
+static void
+disk_1349(struct bregs *regs, struct drive_s *drive_g)
+{
+ if (regs->dl < EXTSTART_CD) {
+ // Always success for HD
+ disk_ret(regs, DISK_RET_SUCCESS);
+ return;
+ }
+ set_invalid(regs);
+ // always send changed ??
+ regs->ah = DISK_RET_ECHANGED;
+}
+
+static void
+disk_134e01(struct bregs *regs, struct drive_s *drive_g)
+{
+ disk_ret(regs, DISK_RET_SUCCESS);
+}
+
+static void
+disk_134e03(struct bregs *regs, struct drive_s *drive_g)
+{
+ disk_ret(regs, DISK_RET_SUCCESS);
+}
+
+static void
+disk_134e04(struct bregs *regs, struct drive_s *drive_g)
+{
+ disk_ret(regs, DISK_RET_SUCCESS);
+}
+
+static void
+disk_134e06(struct bregs *regs, struct drive_s *drive_g)
+{
+ disk_ret(regs, DISK_RET_SUCCESS);
+}
+
+static void
+disk_134eXX(struct bregs *regs, struct drive_s *drive_g)
+{
+ disk_ret(regs, DISK_RET_EPARAM);
+}
+
+// IBM/MS set hardware configuration
+static void
+disk_134e(struct bregs *regs, struct drive_s *drive_g)
+{
+ switch (regs->al) {
+ case 0x01: disk_134e01(regs, drive_g); break;
+ case 0x03: disk_134e03(regs, drive_g); break;
+ case 0x04: disk_134e04(regs, drive_g); break;
+ case 0x06: disk_134e06(regs, drive_g); break;
+ default: disk_134eXX(regs, drive_g); break;
+ }
+}
+
+static void
+disk_13XX(struct bregs *regs, struct drive_s *drive_g)
+{
+ disk_ret_unimplemented(regs, DISK_RET_EPARAM);
+}
+
+static void
+disk_13(struct bregs *regs, struct drive_s *drive_g)
+{
+ //debug_stub(regs);
+
+ // clear completion flag
+ SET_BDA(disk_interrupt_flag, 0);
+
+ switch (regs->ah) {
+ case 0x00: disk_1300(regs, drive_g); break;
+ case 0x01: disk_1301(regs, drive_g); break;
+ case 0x02: disk_1302(regs, drive_g); break;
+ case 0x03: disk_1303(regs, drive_g); break;
+ case 0x04: disk_1304(regs, drive_g); break;
+ case 0x05: disk_1305(regs, drive_g); break;
+ case 0x08: disk_1308(regs, drive_g); break;
+ case 0x09: disk_1309(regs, drive_g); break;
+ case 0x0c: disk_130c(regs, drive_g); break;
+ case 0x0d: disk_130d(regs, drive_g); break;
+ case 0x10: disk_1310(regs, drive_g); break;
+ case 0x11: disk_1311(regs, drive_g); break;
+ case 0x14: disk_1314(regs, drive_g); break;
+ case 0x15: disk_1315(regs, drive_g); break;
+ case 0x16: disk_1316(regs, drive_g); break;
+ case 0x41: disk_1341(regs, drive_g); break;
+ case 0x42: disk_1342(regs, drive_g); break;
+ case 0x43: disk_1343(regs, drive_g); break;
+ case 0x44: disk_1344(regs, drive_g); break;
+ case 0x45: disk_1345(regs, drive_g); break;
+ case 0x46: disk_1346(regs, drive_g); break;
+ case 0x47: disk_1347(regs, drive_g); break;
+ case 0x48: disk_1348(regs, drive_g); break;
+ case 0x49: disk_1349(regs, drive_g); break;
+ case 0x4e: disk_134e(regs, drive_g); break;
+ default: disk_13XX(regs, drive_g); break;
+ }
+}
+
+static void
+floppy_13(struct bregs *regs, struct drive_s *drive_g)
+{
+ // Only limited commands are supported on floppies.
+ switch (regs->ah) {
+ case 0x00:
+ case 0x01:
+ case 0x02:
+ case 0x03:
+ case 0x04:
+ case 0x05:
+ case 0x08:
+ case 0x15:
+ case 0x16:
+ disk_13(regs, drive_g);
+ break;
+ default: disk_13XX(regs, drive_g); break;
+ }
+}
+
+
+/****************************************************************
+ * Entry points
+ ****************************************************************/
+
+static void
+handle_legacy_disk(struct bregs *regs, u8 extdrive)
+{
+ if (! CONFIG_DRIVES) {
+ // XXX - support handle_1301 anyway?
+ disk_ret(regs, DISK_RET_EPARAM);
+ return;
+ }
+
+ if (extdrive < EXTSTART_HD) {
+ struct drive_s *drive_g = getDrive(EXTTYPE_FLOPPY, extdrive);
+ if (!drive_g)
+ goto fail;
+ floppy_13(regs, drive_g);
+ return;
+ }
+
+ struct drive_s *drive_g;
+ if (extdrive >= EXTSTART_CD)
+ drive_g = getDrive(EXTTYPE_CD, extdrive - EXTSTART_CD);
+ else
+ drive_g = getDrive(EXTTYPE_HD, extdrive - EXTSTART_HD);
+ if (!drive_g)
+ goto fail;
+ disk_13(regs, drive_g);
+ return;
+
+fail:
+ // XXX - support 1301/1308/1315 anyway?
+ disk_ret(regs, DISK_RET_EPARAM);
+}
+
+void VISIBLE16
+handle_40(struct bregs *regs)
+{
+ debug_enter(regs, DEBUG_HDL_40);
+ handle_legacy_disk(regs, regs->dl);
+}
+
+// INT 13h Fixed Disk Services Entry Point
+void VISIBLE16
+handle_13(struct bregs *regs)
+{
+ debug_enter(regs, DEBUG_HDL_13);
+ u8 extdrive = regs->dl;
+
+ if (CONFIG_CDROM_EMU) {
+ if (regs->ah == 0x4b) {
+ cdemu_134b(regs);
+ return;
+ }
+ u16 ebda_seg = get_ebda_seg();
+ if (GET_EBDA2(ebda_seg, cdemu.active)) {
+ u8 emudrive = GET_EBDA2(ebda_seg, cdemu.emulated_extdrive);
+ if (extdrive == emudrive) {
+ // Access to an emulated drive.
+ struct drive_s *cdemu_g;
+ cdemu_g = GLOBALFLAT2GLOBAL(GET_GLOBAL(cdemu_drive_gf));
+ if (regs->ah > 0x16) {
+ // Only old-style commands supported.
+ disk_13XX(regs, cdemu_g);
+ return;
+ }
+ disk_13(regs, cdemu_g);
+ return;
+ }
+ if (extdrive < EXTSTART_CD && ((emudrive ^ extdrive) & 0x80) == 0)
+ // Adjust id to make room for emulated drive.
+ extdrive--;
+ }
+ }
+ handle_legacy_disk(regs, extdrive);
+}
+
+// record completion in BIOS task complete flag
+void VISIBLE16
+handle_76(void)
+{
+ debug_isr(DEBUG_ISR_76);
+ SET_BDA(disk_interrupt_flag, 0xff);
+ eoi_pic2();
+}
+
+// Old Fixed Disk Parameter Table (newer tables are in the ebda).
+struct fdpt_s OldFDPT VAR16FIXED(0xe401);
