disk.c revision c58f1213e628a545081c70e26c6b67a841cff880
/*
* Copyright (C) 2006-2012 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
* --------------------------------------------------------------------
*
* This code is based on:
*
* ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
*
* Copyright (C) 2002 MandrakeSoft S.A.
*
* MandrakeSoft S.A.
* 43, rue d'Aboukir
* 75002 Paris - France
* http://www.linux-mandrake.com/
* http://www.mandrakesoft.com/
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <stdint.h>
#include "biosint.h"
#include "inlines.h"
#include "ebda.h"
#include "ata.h"
#if DEBUG_INT13_HD
# define BX_DEBUG_INT13_HD(...) BX_DEBUG(__VA_ARGS__)
#else
# define BX_DEBUG_INT13_HD(...)
#endif
/* Generic disk read/write routine signature. */
typedef __fastcall (* dsk_rw_func)(bio_dsk_t __far *bios_dsk);
/* Controller specific disk access routines. Declared as a union to reduce
* the need for conditionals when choosing between read/write functions.
* Note that we get away with using near pointers, which is nice.
*/
typedef union {
struct {
dsk_rw_func read;
dsk_rw_func write;
} s;
dsk_rw_func a[2];
} dsk_acc_t;
/* Pointers to HW specific disk access routines. */
dsk_acc_t dskacc[DSKTYP_CNT] = {
[DSK_TYPE_ATA] = { ata_read_sectors, ata_write_sectors },
#ifdef VBOX_WITH_AHCI
[DSK_TYPE_AHCI] = { ahci_read_sectors, ahci_write_sectors },
#endif
#ifdef VBOX_WITH_SCSI
[DSK_TYPE_SCSI] = { scsi_read_sectors, scsi_write_sectors },
#endif
};
//@todo: put in a header
#define AX r.gr.u.r16.ax
#define BX r.gr.u.r16.bx
#define CX r.gr.u.r16.cx
#define DX r.gr.u.r16.dx
#define SI r.gr.u.r16.si
#define DI r.gr.u.r16.di
#define BP r.gr.u.r16.bp
#define ELDX r.gr.u.r16.sp
#define DS r.ds
#define ES r.es
#define FLAGS r.ra.flags.u.r16.flags
/*
* Build translated CHS geometry given a disk size in sectors. Based on
* Phoenix EDD 3.0. This is used as a fallback to generate sane logical
* geometry in case none was provided in CMOS.
*/
void set_geom_lba(chs_t __far *lgeo, uint32_t nsectors)
{
uint32_t limit = 8257536; /* 1024 * 128 * 63 */
unsigned heads = 255;
int i;
/* Start with ~4GB limit, go down to 504MB. */
for (i = 0; i < 4; ++i) {
if (nsectors <= limit)
heads = (heads + 1) / 2;
limit /= 2;
}
lgeo->cylinders = nsectors / (heads * 63UL);
if (lgeo->cylinders > 1024)
lgeo->cylinders = 1024;
lgeo->heads = heads;
lgeo->spt = 63; /* Always 63 sectors per track, the maximum. */
}
void BIOSCALL int13_harddisk(disk_regs_t r)
{
uint32_t lba;
uint16_t cylinder, head, sector;
uint16_t nlc, nlh, nlspt;
uint16_t count;
uint8_t device, status;
bio_dsk_t __far *bios_dsk;
BX_DEBUG_INT13_HD("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", __func__, AX, BX, CX, DX, ES);
bios_dsk = read_word(0x0040,0x000E) :> &EbdaData->bdisk;
write_byte(0x0040, 0x008e, 0); // clear completion flag
// basic check : device has to be defined
if ( (GET_ELDL() < 0x80) || (GET_ELDL() >= 0x80 + BX_MAX_STORAGE_DEVICES) ) {
BX_DEBUG("%s: function %02x, ELDL out of range %02x\n", __func__, GET_AH(), GET_ELDL());
goto int13_fail;
}
// Get the ata channel
device = bios_dsk->hdidmap[GET_ELDL()-0x80];
// basic check : device has to be valid
if (device >= BX_MAX_STORAGE_DEVICES) {
BX_DEBUG("%s: function %02x, unmapped device for ELDL=%02x\n", __func__, GET_AH(), GET_ELDL());
goto int13_fail;
}
switch (GET_AH()) {
case 0x00: /* disk controller reset */
#ifdef VBOX_WITH_SCSI
/* SCSI controller does not need a reset. */
if (!VBOX_IS_SCSI_DEVICE(device))
#endif
ata_reset (device);
goto int13_success;
break;
case 0x01: /* read disk status */
status = read_byte(0x0040, 0x0074);
SET_AH(status);
SET_DISK_RET_STATUS(0);
/* set CF if error status read */
if (status) goto int13_fail_nostatus;
else goto int13_success_noah;
break;
case 0x02: // read disk sectors
case 0x03: // write disk sectors
case 0x04: // verify disk sectors
count = GET_AL();
cylinder = GET_CH();
cylinder |= ( ((uint16_t) GET_CL()) << 2) & 0x300;
sector = (GET_CL() & 0x3f);
head = GET_DH();
/* Segment and offset are in ES:BX. */
if ( (count > 128) || (count == 0) ) {
BX_INFO("%s: function %02x, count out of range!\n", __func__, GET_AH());
goto int13_fail;
}
/* Get the logical CHS geometry. */
nlc = bios_dsk->devices[device].lchs.cylinders;
nlh = bios_dsk->devices[device].lchs.heads;
nlspt = bios_dsk->devices[device].lchs.spt;
/* Sanity check the geometry. */
if( (cylinder >= nlc) || (head >= nlh) || (sector > nlspt )) {
BX_INFO("%s: function %02x, disk %02x, parameters out of range %04x/%04x/%04x!\n", __func__, GET_AH(), GET_DL(), cylinder, head, sector);
goto int13_fail;
}
// FIXME verify
if ( GET_AH() == 0x04 )
goto int13_success;
/* If required, translate LCHS to LBA and execute command. */
//@todo: The IS_SCSI_DEVICE check should be redundant...
if (( (bios_dsk->devices[device].pchs.heads != nlh) || (bios_dsk->devices[device].pchs.spt != nlspt)) || VBOX_IS_SCSI_DEVICE(device)) {
lba = ((((uint32_t)cylinder * (uint32_t)nlh) + (uint32_t)head) * (uint32_t)nlspt) + (uint32_t)sector - 1;
sector = 0; // this forces the command to be lba
}
/* Clear the count of transferred sectors/bytes. */
bios_dsk->drqp.trsfsectors = 0;
bios_dsk->drqp.trsfbytes = 0;
/* Pass request information to low level disk code. */
bios_dsk->drqp.lba = lba;
bios_dsk->drqp.buffer = MK_FP(ES, BX);
bios_dsk->drqp.nsect = count;
bios_dsk->drqp.sect_sz = 512; //@todo: device specific?
bios_dsk->drqp.cylinder = cylinder;
bios_dsk->drqp.head = head;
bios_dsk->drqp.sector = sector;
bios_dsk->drqp.dev_id = device;
status = dskacc[bios_dsk->devices[device].type].a[GET_AH() - 0x02](bios_dsk);
// Set nb of sector transferred
SET_AL(bios_dsk->drqp.trsfsectors);
if (status != 0) {
BX_INFO("%s: function %02x, error %02x !\n", __func__, GET_AH(), status);
SET_AH(0x0c);
goto int13_fail_noah;
}
goto int13_success;
break;
case 0x05: /* format disk track */
BX_INFO("format disk track called\n");
goto int13_success;
return;
break;
case 0x08: /* read disk drive parameters */
/* Get the logical geometry from internal table. */
nlc = bios_dsk->devices[device].lchs.cylinders;
nlh = bios_dsk->devices[device].lchs.heads;
nlspt = bios_dsk->devices[device].lchs.spt;
count = bios_dsk->hdcount;
/* Maximum cylinder number is just one less than the number of cylinders. */
nlc = nlc - 1; /* 0 based , last sector not used */
SET_AL(0);
SET_CH(nlc & 0xff);
SET_CL(((nlc >> 2) & 0xc0) | (nlspt & 0x3f));
SET_DH(nlh - 1);
SET_DL(count); /* FIXME returns 0, 1, or n hard drives */
// FIXME should set ES & DI
// @todo: Actually, the above comment is nonsense.
goto int13_success;
break;
case 0x10: /* check drive ready */
// should look at 40:8E also???
// Read the status from controller
status = inb(bios_dsk->channels[device/2].iobase1 + ATA_CB_STAT);
if ( (status & ( ATA_CB_STAT_BSY | ATA_CB_STAT_RDY )) == ATA_CB_STAT_RDY ) {
goto int13_success;
} else {
SET_AH(0xAA);
goto int13_fail_noah;
}
break;
case 0x15: /* read disk drive size */
/* Get the physical geometry from internal table. */
cylinder = bios_dsk->devices[device].pchs.cylinders;
head = bios_dsk->devices[device].pchs.heads;
sector = bios_dsk->devices[device].pchs.spt;
/* Calculate sector count seen by old style INT 13h. */
lba = (uint32_t)cylinder * head * sector;
CX = lba >> 16;
DX = lba & 0xffff;
SET_AH(3); // hard disk accessible
goto int13_success_noah;
break;
case 0x09: /* initialize drive parameters */
case 0x0c: /* seek to specified cylinder */
case 0x0d: /* alternate disk reset */
case 0x11: /* recalibrate */
case 0x14: /* controller internal diagnostic */
BX_INFO("%s: function %02xh unimplemented, returns success\n", __func__, GET_AH());
goto int13_success;
break;
case 0x0a: /* read disk sectors with ECC */
case 0x0b: /* write disk sectors with ECC */
case 0x18: // set media type for format
default:
BX_INFO("%s: function %02xh unsupported, returns fail\n", __func__, GET_AH());
goto int13_fail;
break;
}
int13_fail:
SET_AH(0x01); // defaults to invalid function in AH or invalid parameter
int13_fail_noah:
SET_DISK_RET_STATUS(GET_AH());
int13_fail_nostatus:
SET_CF(); // error occurred
return;
int13_success:
SET_AH(0x00); // no error
int13_success_noah:
SET_DISK_RET_STATUS(0x00);
CLEAR_CF(); // no error
return;
}
void BIOSCALL int13_harddisk_ext(disk_regs_t r)
{
uint32_t lba;
uint16_t ebda_seg = read_word(0x0040,0x000E);
uint16_t segment, offset;
uint16_t npc, nph, npspt;
uint16_t size, count;
uint8_t device, status;
uint8_t type;
bio_dsk_t __far *bios_dsk;
int13ext_t __far *i13_ext;
dpt_t __far *dpt;
bios_dsk = read_word(0x0040,0x000E) :> &EbdaData->bdisk;
BX_DEBUG_INT13_HD("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", __func__, AX, BX, CX, DX, ES);
write_byte(0x0040, 0x008e, 0); // clear completion flag
// basic check : device has to be defined
if ( (GET_ELDL() < 0x80) || (GET_ELDL() >= 0x80 + BX_MAX_STORAGE_DEVICES) ) {
BX_DEBUG("%s: function %02x, ELDL out of range %02x\n", __func__, GET_AH(), GET_ELDL());
goto int13x_fail;
}
// Get the ata channel
device = bios_dsk->hdidmap[GET_ELDL()-0x80];
// basic check : device has to be valid
if (device >= BX_MAX_STORAGE_DEVICES) {
BX_DEBUG("%s: function %02x, unmapped device for ELDL=%02x\n", __func__, GET_AH(), GET_ELDL());
goto int13x_fail;
}
switch (GET_AH()) {
case 0x41: // IBM/MS installation check
BX=0xaa55; // install check
SET_AH(0x30); // EDD 3.0
CX=0x0007; // ext disk access and edd, removable supported
goto int13x_success_noah;
break;
case 0x42: // IBM/MS extended read
case 0x43: // IBM/MS extended write
case 0x44: // IBM/MS verify
case 0x47: // IBM/MS extended seek
/* Get a pointer to the extended structure. */
i13_ext = DS :> (int13ext_t *)SI;
count = i13_ext->count;
segment = i13_ext->segment;
offset = i13_ext->offset;
BX_DEBUG_INT13_HD("%s: %d sectors from lba %u @ %04x:%04x\n", __func__,
count, i13_ext->lba1, segment, offset);
// Can't use 64 bits lba
lba = i13_ext->lba2;
if (lba != 0L) {
BX_PANIC("%s: function %02x. Can't use 64bits lba\n", __func__, GET_AH());
goto int13x_fail;
}
// Get 32 bits lba and check
lba = i13_ext->lba1;
type = bios_dsk->devices[device].type;
if (lba >= bios_dsk->devices[device].sectors) {
BX_INFO("%s: function %02x. LBA out of range\n", __func__, GET_AH());
goto int13x_fail;
}
/* Don't bother with seek or verify. */
if (( GET_AH() == 0x44 ) || ( GET_AH() == 0x47 ))
goto int13x_success;
/* Clear the count of transferred sectors/bytes. */
bios_dsk->drqp.trsfsectors = 0;
bios_dsk->drqp.trsfbytes = 0;
/* Pass request information to low level disk code. */
bios_dsk->drqp.lba = lba;
bios_dsk->drqp.buffer = MK_FP(segment, offset);
bios_dsk->drqp.nsect = count;
bios_dsk->drqp.sect_sz = 512; //@todo: device specific?
bios_dsk->drqp.sector = 0; /* Indicate LBA. */
bios_dsk->drqp.dev_id = device;
/* Execute the read or write command. */
status = dskacc[type].a[GET_AH() - 0x42](bios_dsk);
count = bios_dsk->drqp.trsfsectors;
i13_ext->count = count;
if (status != 0) {
BX_INFO("%s: function %02x, error %02x !\n", __func__, GET_AH(), status);
SET_AH(0x0c);
goto int13x_fail_noah;
}
goto int13x_success;
break;
case 0x45: // IBM/MS lock/unlock drive
case 0x49: // IBM/MS extended media change
goto int13x_success; // Always success for HD
break;
case 0x46: // IBM/MS eject media
SET_AH(0xb2); // Volume Not Removable
goto int13x_fail_noah; // Always fail for HD
break;
case 0x48: // IBM/MS get drive parameters
dpt = DS :> (dpt_t *)SI;
size = dpt->size;
/* Check if buffer is large enough. */
if (size < 0x1a)
goto int13x_fail;
/* Fill in EDD 1.x table. */
if (size >= 0x1a) {
uint16_t blksize;
npc = bios_dsk->devices[device].pchs.cylinders;
nph = bios_dsk->devices[device].pchs.heads;
npspt = bios_dsk->devices[device].pchs.spt;
lba = bios_dsk->devices[device].sectors;
blksize = bios_dsk->devices[device].blksize;
dpt->size = 0x1a;
dpt->infos = 0x02; // geometry is valid
dpt->cylinders = npc;
dpt->heads = nph;
dpt->spt = npspt;
dpt->blksize = blksize;
dpt->sector_count1 = lba; // FIXME should be Bit64
dpt->sector_count2 = 0;
}
/* Fill in EDD 2.x table. */
if (size >= 0x1e) {
uint8_t channel, irq, mode, checksum, i, translation;
uint16_t iobase1, iobase2, options;
dpt->size = 0x1e;
dpt->dpte_segment = ebda_seg;
dpt->dpte_offset = (uint16_t)&EbdaData->bdisk.dpte;
// Fill in dpte
channel = device / 2;
iobase1 = bios_dsk->channels[channel].iobase1;
iobase2 = bios_dsk->channels[channel].iobase2;
irq = bios_dsk->channels[channel].irq;
mode = bios_dsk->devices[device].mode;
translation = bios_dsk->devices[device].translation;
options = (translation == GEO_TRANSLATION_NONE ? 0 : 1 << 3); // chs translation
options |= (1 << 4); // lba translation
options |= (mode == ATA_MODE_PIO32 ? 1 : 0 << 7);
options |= (translation == GEO_TRANSLATION_LBA ? 1 : 0 << 9);
options |= (translation == GEO_TRANSLATION_RECHS ? 3 : 0 << 9);
bios_dsk->dpte.iobase1 = iobase1;
bios_dsk->dpte.iobase2 = iobase2;
bios_dsk->dpte.prefix = (0xe | (device % 2)) << 4;
bios_dsk->dpte.unused = 0xcb;
bios_dsk->dpte.irq = irq;
bios_dsk->dpte.blkcount = 1;
bios_dsk->dpte.dma = 0;
bios_dsk->dpte.pio = 0;
bios_dsk->dpte.options = options;
bios_dsk->dpte.reserved = 0;
bios_dsk->dpte.revision = 0x11;
checksum = 0;
for (i = 0; i < 15; ++i)
checksum += read_byte(ebda_seg, (uint16_t)&EbdaData->bdisk.dpte + i);
checksum = -checksum;
bios_dsk->dpte.checksum = checksum;
}
/* Fill in EDD 3.x table. */
if(size >= 0x42) {
uint8_t channel, iface, checksum, i;
uint16_t iobase1;
channel = device / 2;
iface = bios_dsk->channels[channel].iface;
iobase1 = bios_dsk->channels[channel].iobase1;
dpt->size = 0x42;
dpt->key = 0xbedd;
dpt->dpi_length = 0x24;
dpt->reserved1 = 0;
dpt->reserved2 = 0;
if (iface == ATA_IFACE_ISA) {
dpt->host_bus[0] = 'I';
dpt->host_bus[1] = 'S';
dpt->host_bus[2] = 'A';
dpt->host_bus[3] = ' ';
}
else {
// FIXME PCI
}
dpt->iface_type[0] = 'A';
dpt->iface_type[1] = 'T';
dpt->iface_type[2] = 'A';
dpt->iface_type[3] = ' ';
dpt->iface_type[4] = ' ';
dpt->iface_type[5] = ' ';
dpt->iface_type[6] = ' ';
dpt->iface_type[7] = ' ';
if (iface == ATA_IFACE_ISA) {
((uint16_t __far *)dpt->iface_path)[0] = iobase1;
((uint16_t __far *)dpt->iface_path)[1] = 0;
((uint32_t __far *)dpt->iface_path)[1] = 0;
}
else {
// FIXME PCI
}
((uint16_t __far *)dpt->device_path)[0] = device & 1; // device % 2; @todo: correct?
((uint16_t __far *)dpt->device_path)[1] = 0;
((uint32_t __far *)dpt->device_path)[1] = 0;
checksum = 0;
for (i = 30; i < 64; i++)
checksum += read_byte(DS, SI + i);
checksum = -checksum;
dpt->checksum = checksum;
}
goto int13x_success;
break;
case 0x4e: // // IBM/MS set hardware configuration
// DMA, prefetch, PIO maximum not supported
switch (GET_AL()) {
case 0x01:
case 0x03:
case 0x04:
case 0x06:
goto int13x_success;
break;
default :
goto int13x_fail;
}
break;
case 0x50: // IBM/MS send packet command
default:
BX_INFO("%s: function %02xh unsupported, returns fail\n", __func__, GET_AH());
goto int13x_fail;
break;
}
int13x_fail:
SET_AH(0x01); // defaults to invalid function in AH or invalid parameter
int13x_fail_noah:
SET_DISK_RET_STATUS(GET_AH());
SET_CF(); // error occurred
return;
int13x_success:
SET_AH(0x00); // no error
int13x_success_noah:
SET_DISK_RET_STATUS(0x00);
CLEAR_CF(); // no error
return;
}
/* Avoid saving general registers already saved by caller (PUSHA). */
#pragma aux int13_harddisk modify [di si cx dx bx];
#pragma aux int13_harddisk_ext modify [di si cx dx bx];