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Diffstat (limited to 'src/VBox/Devices/PC/BIOS/disk.c')
-rw-r--r--src/VBox/Devices/PC/BIOS/disk.c95
1 files changed, 63 insertions, 32 deletions
diff --git a/src/VBox/Devices/PC/BIOS/disk.c b/src/VBox/Devices/PC/BIOS/disk.c
index 763b7283..4a541abd 100644
--- a/src/VBox/Devices/PC/BIOS/disk.c
+++ b/src/VBox/Devices/PC/BIOS/disk.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2006-2011 Oracle Corporation
+ * 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;
@@ -92,6 +92,33 @@ dsk_acc_t dskacc[DSKTYP_CNT] = {
#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;
@@ -105,16 +132,16 @@ void BIOSCALL int13_harddisk(disk_regs_t r)
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());
@@ -150,8 +177,8 @@ void BIOSCALL int13_harddisk(disk_regs_t r)
cylinder |= ( ((uint16_t) GET_CL()) << 2) & 0x300;
sector = (GET_CL() & 0x3f);
head = GET_DH();
-
- /* Segment and offset are in ES:BX. */
+
+ /* 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;
@@ -167,7 +194,7 @@ void BIOSCALL int13_harddisk(disk_regs_t r)
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;
@@ -179,6 +206,9 @@ void BIOSCALL int13_harddisk(disk_regs_t r)
sector = 0; // this forces the command to be lba
}
+ BX_DEBUG_INT13_HD("%s: %d sectors from lba %lu @ %04x:%04x\n", __func__,
+ count, lba, ES, BX);
+
/* Clear the count of transferred sectors/bytes. */
bios_dsk->drqp.trsfsectors = 0;
bios_dsk->drqp.trsfbytes = 0;
@@ -197,13 +227,13 @@ void BIOSCALL int13_harddisk(disk_regs_t r)
// 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;
@@ -228,10 +258,10 @@ void BIOSCALL int13_harddisk(disk_regs_t r)
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;
@@ -259,7 +289,7 @@ void BIOSCALL int13_harddisk(disk_regs_t r)
lba = (uint32_t)cylinder * head * sector;
CX = lba >> 16;
DX = lba & 0xffff;
-
+
SET_AH(3); // hard disk accessible
goto int13_success_noah;
break;
@@ -313,19 +343,20 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
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);
-
+ BX_DEBUG_INT13_HD("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x DS=%04x SI=%04x\n",
+ __func__, AX, BX, CX, DX, ES, DS, SI);
+
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());
@@ -352,7 +383,7 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
segment = i13_ext->segment;
offset = i13_ext->offset;
- BX_DEBUG_INT13_HD("%s: %d sectors from lba %u @ %04x:%04x\n", __func__,
+ BX_DEBUG_INT13_HD("%s: %d sectors from lba %lu @ %04x:%04x\n", __func__,
count, i13_ext->lba1, segment, offset);
// Can't use 64 bits lba
@@ -361,7 +392,7 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
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;
@@ -386,18 +417,18 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
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;
@@ -418,7 +449,7 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
/* Check if buffer is large enough. */
if (size < 0x1a)
goto int13x_fail;
-
+
/* Fill in EDD 1.x table. */
if (size >= 0x1a) {
uint16_t blksize;
@@ -443,11 +474,11 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
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;
@@ -455,13 +486,13 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
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;
@@ -473,7 +504,7 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
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);
@@ -489,13 +520,13 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
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';
@@ -513,7 +544,7 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
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;
@@ -525,7 +556,7 @@ void BIOSCALL int13_harddisk_ext(disk_regs_t r)
((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);
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