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seabios/src/disk.c

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// 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 "biosvar.h" // SET_BDA
#include "bregs.h" // struct bregs
#include "config.h" // CONFIG_*
#include "hw/ata.h" // ATA_CB_DC
#include "hw/pic.h" // pic_eoi2
#include "output.h" // debug_enter
#include "stacks.h" // call16_int
#include "std/disk.h" // DISK_RET_SUCCESS
#include "string.h" // memset
#include "util.h" // CDRom_locks
/****************************************************************
* Return status functions
****************************************************************/
static 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);
}
static 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_ret(regs, code) \
__disk_ret((regs), (code) | (__LINE__ << 8), __func__)
#define disk_ret_unimplemented(regs, code) \
__disk_ret_unimplemented((regs), (code) | (__LINE__ << 8), __func__)
#define DISK_STUB(regs) \
__disk_stub((regs), __LINE__, __func__)
/****************************************************************
* Helper functions
****************************************************************/
// Get the cylinders/heads/sectors for the given drive.
static struct chs_s
getLCHS(struct drive_s *drive_fl)
{
struct chs_s res = { };
if (CONFIG_CDROM_EMU && drive_fl == GET_GLOBAL(cdemu_drive_gf)) {
// Emulated drive - get info from CDEmu. (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).
u8 sptcyl = GET_LOW(CDEmu.chs.sptcyl);
res.cylinder = GET_LOW(CDEmu.chs.cyllow) + ((sptcyl << 2) & 0x300) + 1;
res.head = GET_LOW(CDEmu.chs.heads) + 1;
res.sector = sptcyl & 0x3f;
return res;
}
res.cylinder = GET_FLATPTR(drive_fl->lchs.cylinder);
res.head = GET_FLATPTR(drive_fl->lchs.head);
res.sector = GET_FLATPTR(drive_fl->lchs.sector);
return res;
}
// Execute a "disk_op_s" request after jumping to the extra stack.
static int
__send_disk_op(struct disk_op_s *op_far, u16 op_seg)
{
struct disk_op_s dop;
memcpy_far(GET_SEG(SS), &dop, op_seg, op_far, sizeof(dop));
int status = process_op(&dop);
// Update count with total sectors transferred.
SET_FARVAR(op_seg, op_far->count, dop.count);
return status;
}
// Execute a "disk_op_s" request (using the extra 16bit stack).
static int
send_disk_op(struct disk_op_s *op)
{
ASSERT16();
if (! CONFIG_DRIVES)
return -1;
if (!CONFIG_ENTRY_EXTRASTACK)
// Jump on to extra stack
return stack_hop(__send_disk_op, op, GET_SEG(SS));
return process_op(op);
}
// Perform read/write/verify using old-style chs accesses
static void noinline
basic_access(struct bregs *regs, struct drive_s *drive_fl, u16 command)
{
struct disk_op_s dop;
dop.drive_fl = drive_fl;
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;
struct chs_s chs = getLCHS(drive_fl);
u16 nlc=chs.cylinder, nlh=chs.head, nls=chs.sector;
// sanity check on cyl heads, sec
if (cylinder >= nlc || head >= nlh || sector > nls) {
warn_invalid(regs);
disk_ret(regs, DISK_RET_EPARAM);
return;
}
// translate lchs to lba
dop.lba = (((((u32)cylinder * (u32)nlh) + (u32)head) * (u32)nls)
+ (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 noinline
extended_access(struct bregs *regs, struct drive_s *drive_fl, u16 command)
{
struct disk_op_s dop;
struct int13ext_s *param_far = (struct int13ext_s*)(regs->si+0);
// Get lba and check.
dop.lba = GET_FARVAR(regs->ds, param_far->lba);
dop.command = command;
dop.drive_fl = drive_fl;
if (dop.lba >= GET_FLATPTR(drive_fl->sectors)) {
warn_invalid(regs);
disk_ret(regs, DISK_RET_EPARAM);
return;
}
dop.buf_fl = SEGOFF_TO_FLATPTR(GET_FARVAR(regs->ds, param_far->data));
dop.count = GET_FARVAR(regs->ds, param_far->count);
if (! dop.count) {
// Nothing to do.
disk_ret(regs, DISK_RET_SUCCESS);
return;
}
int status = send_disk_op(&dop);
SET_FARVAR(regs->ds, param_far->count, dop.count);
disk_ret(regs, status);
}
/****************************************************************
* Hard Drive functions
****************************************************************/
// disk controller reset
static void
disk_1300(struct bregs *regs, struct drive_s *drive_fl)
{
struct disk_op_s dop;
dop.drive_fl = drive_fl;
dop.command = CMD_RESET;
dop.count = 0;
int status = send_disk_op(&dop);
disk_ret(regs, status);
}
// read disk status
static void
disk_1301(struct bregs *regs, struct drive_s *drive_fl)
{
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_fl)
{
basic_access(regs, drive_fl, CMD_READ);
}
// write disk sectors
static void
disk_1303(struct bregs *regs, struct drive_s *drive_fl)
{
basic_access(regs, drive_fl, CMD_WRITE);
}
// verify disk sectors
static void
disk_1304(struct bregs *regs, struct drive_s *drive_fl)
{
basic_access(regs, drive_fl, CMD_VERIFY);
}
// format disk track
static void noinline
disk_1305(struct bregs *regs, struct drive_s *drive_fl)
{
debug_stub(regs);
struct chs_s chs = getLCHS(drive_fl);
u16 nlc=chs.cylinder, nlh=chs.head, nls=chs.sector;
u8 count = regs->al;
u8 cylinder = regs->ch;
u8 head = regs->dh;
if (cylinder >= nlc || head >= nlh || count == 0 || count > nls) {
disk_ret(regs, DISK_RET_EPARAM);
return;
}
struct disk_op_s dop;
dop.drive_fl = drive_fl;
dop.command = CMD_FORMAT;
dop.lba = (((u32)cylinder * (u32)nlh) + (u32)head) * (u32)nls;
dop.count = count;
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 noinline
disk_1308(struct bregs *regs, struct drive_s *drive_fl)
{
// Get logical geometry from table
struct chs_s chs = getLCHS(drive_fl);
u16 nlc=chs.cylinder, nlh=chs.head, nls=chs.sector;
nlc--;
nlh--;
u8 count;
if (regs->dl < EXTSTART_HD) {
// Floppy
count = GET_GLOBAL(FloppyCount);
if (CONFIG_CDROM_EMU && drive_fl == GET_GLOBAL(cdemu_drive_gf))
regs->bx = GET_LOW(CDEmu.media) * 2;
else
regs->bx = GET_FLATPTR(drive_fl->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_LOW(CDEmu.media)) {
u8 emudrive = GET_LOW(CDEmu.emulated_drive);
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) | (nls & 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_fl)
{
DISK_STUB(regs);
}
// seek to specified cylinder
static void
disk_130c(struct bregs *regs, struct drive_s *drive_fl)
{
DISK_STUB(regs);
}
// alternate disk reset
static void
disk_130d(struct bregs *regs, struct drive_s *drive_fl)
{
DISK_STUB(regs);
}
// check drive ready
static void
disk_1310(struct bregs *regs, struct drive_s *drive_fl)
{
// should look at 40:8E also???
struct disk_op_s dop;
dop.drive_fl = drive_fl;
dop.command = CMD_ISREADY;
dop.count = 0;
int status = send_disk_op(&dop);
disk_ret(regs, status);
}
// recalibrate
static void
disk_1311(struct bregs *regs, struct drive_s *drive_fl)
{
DISK_STUB(regs);
}
// controller internal diagnostic
static void
disk_1314(struct bregs *regs, struct drive_s *drive_fl)
{
DISK_STUB(regs);
}
// read disk drive size
static void noinline
disk_1315(struct bregs *regs, struct drive_s *drive_fl)
{
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
struct chs_s chs = getLCHS(drive_fl);
u16 nlc=chs.cylinder, nlh=chs.head, nls=chs.sector;
// Compute sector count seen by int13
u32 lba = (u32)(nlc - 1) * (u32)nlh * (u32)nls;
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_fl)
{
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_fl)
{
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_fl)
{
extended_access(regs, drive_fl, CMD_READ);
}
// IBM/MS extended write
static void
disk_1343(struct bregs *regs, struct drive_s *drive_fl)
{
extended_access(regs, drive_fl, CMD_WRITE);
}
// IBM/MS verify
static void
disk_1344(struct bregs *regs, struct drive_s *drive_fl)
{
extended_access(regs, drive_fl, CMD_VERIFY);
}
// Locks for removable devices
u8 CDRom_locks[BUILD_MAX_EXTDRIVE] VARLOW;
// lock
static void
disk_134500(struct bregs *regs, struct drive_s *drive_fl)
{
int cdid = regs->dl - EXTSTART_CD;
u8 locks = GET_LOW(CDRom_locks[cdid]);
if (locks == 0xff) {
regs->al = 1;
disk_ret(regs, DISK_RET_ETOOMANYLOCKS);
return;
}
SET_LOW(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_fl)
{
int cdid = regs->dl - EXTSTART_CD;
u8 locks = GET_LOW(CDRom_locks[cdid]);
if (locks == 0x00) {
regs->al = 0;
disk_ret(regs, DISK_RET_ENOTLOCKED);
return;
}
locks--;
SET_LOW(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_fl)
{
int cdid = regs->dl - EXTSTART_CD;
u8 locks = GET_LOW(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_fl)
{
disk_ret_unimplemented(regs, DISK_RET_EPARAM);
}
// IBM/MS lock/unlock drive
static void
disk_1345(struct bregs *regs, struct drive_s *drive_fl)
{
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_fl); break;
case 0x01: disk_134501(regs, drive_fl); break;
case 0x02: disk_134502(regs, drive_fl); break;
default: disk_1345XX(regs, drive_fl); break;
}
}
// IBM/MS eject media
static void noinline
disk_1346(struct bregs *regs, struct drive_s *drive_fl)
{
if (regs->dl < EXTSTART_CD) {
// Volume Not Removable
disk_ret(regs, DISK_RET_ENOTREMOVABLE);
return;
}
int cdid = regs->dl - EXTSTART_CD;
u8 locks = GET_LOW(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_fl)
{
extended_access(regs, drive_fl, CMD_SEEK);
}
// IBM/MS get drive parameters
static void
disk_1348(struct bregs *regs, struct drive_s *drive_fl)
{
int ret = fill_edd(SEGOFF(regs->ds, regs->si), drive_fl);
disk_ret(regs, ret);
}
// IBM/MS extended media change
static void
disk_1349(struct bregs *regs, struct drive_s *drive_fl)
{
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_fl)
{
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
disk_134e03(struct bregs *regs, struct drive_s *drive_fl)
{
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
disk_134e04(struct bregs *regs, struct drive_s *drive_fl)
{
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
disk_134e06(struct bregs *regs, struct drive_s *drive_fl)
{
disk_ret(regs, DISK_RET_SUCCESS);
}
static void
disk_134eXX(struct bregs *regs, struct drive_s *drive_fl)
{
disk_ret(regs, DISK_RET_EPARAM);
}
// IBM/MS set hardware configuration
static void
disk_134e(struct bregs *regs, struct drive_s *drive_fl)
{
switch (regs->al) {
case 0x01: disk_134e01(regs, drive_fl); break;
case 0x03: disk_134e03(regs, drive_fl); break;
case 0x04: disk_134e04(regs, drive_fl); break;
case 0x06: disk_134e06(regs, drive_fl); break;
default: disk_134eXX(regs, drive_fl); break;
}
}
static void
disk_13XX(struct bregs *regs, struct drive_s *drive_fl)
{
disk_ret_unimplemented(regs, DISK_RET_EPARAM);
}
static void
disk_13(struct bregs *regs, struct drive_s *drive_fl)
{
//debug_stub(regs);
// clear completion flag
SET_BDA(disk_interrupt_flag, 0);
switch (regs->ah) {
case 0x00: disk_1300(regs, drive_fl); break;
case 0x01: disk_1301(regs, drive_fl); break;
case 0x02: disk_1302(regs, drive_fl); break;
case 0x03: disk_1303(regs, drive_fl); break;
case 0x04: disk_1304(regs, drive_fl); break;
case 0x05: disk_1305(regs, drive_fl); break;
case 0x08: disk_1308(regs, drive_fl); break;
case 0x09: disk_1309(regs, drive_fl); break;
case 0x0c: disk_130c(regs, drive_fl); break;
case 0x0d: disk_130d(regs, drive_fl); break;
case 0x10: disk_1310(regs, drive_fl); break;
case 0x11: disk_1311(regs, drive_fl); break;
case 0x14: disk_1314(regs, drive_fl); break;
case 0x15: disk_1315(regs, drive_fl); break;
case 0x16: disk_1316(regs, drive_fl); break;
case 0x41: disk_1341(regs, drive_fl); break;
case 0x42: disk_1342(regs, drive_fl); break;
case 0x43: disk_1343(regs, drive_fl); break;
case 0x44: disk_1344(regs, drive_fl); break;
case 0x45: disk_1345(regs, drive_fl); break;
case 0x46: disk_1346(regs, drive_fl); break;
case 0x47: disk_1347(regs, drive_fl); break;
case 0x48: disk_1348(regs, drive_fl); break;
case 0x49: disk_1349(regs, drive_fl); break;
case 0x4e: disk_134e(regs, drive_fl); break;
default: disk_13XX(regs, drive_fl); break;
}
}
static void
floppy_13(struct bregs *regs, struct drive_s *drive_fl)
{
// 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_fl);
break;
default: disk_13XX(regs, drive_fl); break;
}
}
// ElTorito - Terminate disk emu
static void
cdemu_134b(struct bregs *regs)
{
memcpy_far(regs->ds, (void*)(regs->si+0), SEG_LOW, &CDEmu, sizeof(CDEmu));
// If we have to terminate emulation
if (regs->al == 0x00) {
// FIXME ElTorito Various. Should be handled accordingly to spec
SET_LOW(CDEmu.media, 0x00); // bye bye
// XXX - update floppy/hd count.
}
disk_ret(regs, DISK_RET_SUCCESS);
}
/****************************************************************
* 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_fl = getDrive(EXTTYPE_FLOPPY, extdrive);
if (!drive_fl)
goto fail;
floppy_13(regs, drive_fl);
return;
}
struct drive_s *drive_fl;
if (extdrive >= EXTSTART_CD)
drive_fl = getDrive(EXTTYPE_CD, extdrive - EXTSTART_CD);
else
drive_fl = getDrive(EXTTYPE_HD, extdrive - EXTSTART_HD);
if (!drive_fl)
goto fail;
disk_13(regs, drive_fl);
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;
}
if (GET_LOW(CDEmu.media)) {
u8 emudrive = GET_LOW(CDEmu.emulated_drive);
if (extdrive == emudrive) {
// Access to an emulated drive.
struct drive_s *cdemu_gf = GET_GLOBAL(cdemu_drive_gf);
if (regs->ah > 0x16) {
// Only old-style commands supported.
disk_13XX(regs, cdemu_gf);
return;
}
disk_13(regs, cdemu_gf);
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);
pic_eoi2();
}
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