Abstract out geometry detection code from IDE for reuse
Virtio will want to use the geometry detection code. It doesn't belong in ide.c anyway. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5797 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori
parent
357c692cca
commit
f3d54fc494
116
block.c
116
block.c
@ -739,6 +739,122 @@ void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
||||
*nb_sectors_ptr = length;
|
||||
}
|
||||
|
||||
struct partition {
|
||||
uint8_t boot_ind; /* 0x80 - active */
|
||||
uint8_t head; /* starting head */
|
||||
uint8_t sector; /* starting sector */
|
||||
uint8_t cyl; /* starting cylinder */
|
||||
uint8_t sys_ind; /* What partition type */
|
||||
uint8_t end_head; /* end head */
|
||||
uint8_t end_sector; /* end sector */
|
||||
uint8_t end_cyl; /* end cylinder */
|
||||
uint32_t start_sect; /* starting sector counting from 0 */
|
||||
uint32_t nr_sects; /* nr of sectors in partition */
|
||||
} __attribute__((packed));
|
||||
|
||||
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
||||
static int guess_disk_lchs(BlockDriverState *bs,
|
||||
int *pcylinders, int *pheads, int *psectors)
|
||||
{
|
||||
uint8_t buf[512];
|
||||
int ret, i, heads, sectors, cylinders;
|
||||
struct partition *p;
|
||||
uint32_t nr_sects;
|
||||
int64_t nb_sectors;
|
||||
|
||||
bdrv_get_geometry(bs, &nb_sectors);
|
||||
|
||||
ret = bdrv_read(bs, 0, buf, 1);
|
||||
if (ret < 0)
|
||||
return -1;
|
||||
/* test msdos magic */
|
||||
if (buf[510] != 0x55 || buf[511] != 0xaa)
|
||||
return -1;
|
||||
for(i = 0; i < 4; i++) {
|
||||
p = ((struct partition *)(buf + 0x1be)) + i;
|
||||
nr_sects = le32_to_cpu(p->nr_sects);
|
||||
if (nr_sects && p->end_head) {
|
||||
/* We make the assumption that the partition terminates on
|
||||
a cylinder boundary */
|
||||
heads = p->end_head + 1;
|
||||
sectors = p->end_sector & 63;
|
||||
if (sectors == 0)
|
||||
continue;
|
||||
cylinders = nb_sectors / (heads * sectors);
|
||||
if (cylinders < 1 || cylinders > 16383)
|
||||
continue;
|
||||
*pheads = heads;
|
||||
*psectors = sectors;
|
||||
*pcylinders = cylinders;
|
||||
#if 0
|
||||
printf("guessed geometry: LCHS=%d %d %d\n",
|
||||
cylinders, heads, sectors);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
|
||||
{
|
||||
int translation, lba_detected = 0;
|
||||
int cylinders, heads, secs;
|
||||
int64_t nb_sectors;
|
||||
|
||||
/* if a geometry hint is available, use it */
|
||||
bdrv_get_geometry(bs, &nb_sectors);
|
||||
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
|
||||
translation = bdrv_get_translation_hint(bs);
|
||||
if (cylinders != 0) {
|
||||
*pcyls = cylinders;
|
||||
*pheads = heads;
|
||||
*psecs = secs;
|
||||
} else {
|
||||
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
|
||||
if (heads > 16) {
|
||||
/* if heads > 16, it means that a BIOS LBA
|
||||
translation was active, so the default
|
||||
hardware geometry is OK */
|
||||
lba_detected = 1;
|
||||
goto default_geometry;
|
||||
} else {
|
||||
*pcyls = cylinders;
|
||||
*pheads = heads;
|
||||
*psecs = secs;
|
||||
/* disable any translation to be in sync with
|
||||
the logical geometry */
|
||||
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
||||
bdrv_set_translation_hint(bs,
|
||||
BIOS_ATA_TRANSLATION_NONE);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
default_geometry:
|
||||
/* if no geometry, use a standard physical disk geometry */
|
||||
cylinders = nb_sectors / (16 * 63);
|
||||
|
||||
if (cylinders > 16383)
|
||||
cylinders = 16383;
|
||||
else if (cylinders < 2)
|
||||
cylinders = 2;
|
||||
*pcyls = cylinders;
|
||||
*pheads = 16;
|
||||
*psecs = 63;
|
||||
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
|
||||
if ((*pcyls * *pheads) <= 131072) {
|
||||
bdrv_set_translation_hint(bs,
|
||||
BIOS_ATA_TRANSLATION_LARGE);
|
||||
} else {
|
||||
bdrv_set_translation_hint(bs,
|
||||
BIOS_ATA_TRANSLATION_LBA);
|
||||
}
|
||||
}
|
||||
}
|
||||
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
|
||||
}
|
||||
}
|
||||
|
||||
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
||||
int cyls, int heads, int secs)
|
||||
{
|
||||
|
||||
1
block.h
1
block.h
@ -78,6 +78,7 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
||||
int bdrv_truncate(BlockDriverState *bs, int64_t offset);
|
||||
int64_t bdrv_getlength(BlockDriverState *bs);
|
||||
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
|
||||
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs);
|
||||
int bdrv_commit(BlockDriverState *bs);
|
||||
/* async block I/O */
|
||||
typedef struct BlockDriverAIOCB BlockDriverAIOCB;
|
||||
|
||||
112
hw/ide.c
112
hw/ide.c
@ -2676,69 +2676,13 @@ static void ide_reset(IDEState *s)
|
||||
s->media_changed = 0;
|
||||
}
|
||||
|
||||
struct partition {
|
||||
uint8_t boot_ind; /* 0x80 - active */
|
||||
uint8_t head; /* starting head */
|
||||
uint8_t sector; /* starting sector */
|
||||
uint8_t cyl; /* starting cylinder */
|
||||
uint8_t sys_ind; /* What partition type */
|
||||
uint8_t end_head; /* end head */
|
||||
uint8_t end_sector; /* end sector */
|
||||
uint8_t end_cyl; /* end cylinder */
|
||||
uint32_t start_sect; /* starting sector counting from 0 */
|
||||
uint32_t nr_sects; /* nr of sectors in partition */
|
||||
} __attribute__((packed));
|
||||
|
||||
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
||||
static int guess_disk_lchs(IDEState *s,
|
||||
int *pcylinders, int *pheads, int *psectors)
|
||||
{
|
||||
uint8_t *buf = s->io_buffer;
|
||||
int ret, i, heads, sectors, cylinders;
|
||||
struct partition *p;
|
||||
uint32_t nr_sects;
|
||||
|
||||
ret = bdrv_read(s->bs, 0, buf, 1);
|
||||
if (ret < 0) {
|
||||
return -1;
|
||||
}
|
||||
/* test msdos magic */
|
||||
if (buf[510] != 0x55 || buf[511] != 0xaa) {
|
||||
return -1;
|
||||
}
|
||||
for(i = 0; i < 4; i++) {
|
||||
p = ((struct partition *)(buf + 0x1be)) + i;
|
||||
nr_sects = le32_to_cpu(p->nr_sects);
|
||||
if (nr_sects && p->end_head) {
|
||||
/* We make the assumption that the partition terminates on
|
||||
a cylinder boundary */
|
||||
heads = p->end_head + 1;
|
||||
sectors = p->end_sector & 63;
|
||||
if (sectors == 0)
|
||||
continue;
|
||||
cylinders = s->nb_sectors / (heads * sectors);
|
||||
if (cylinders < 1 || cylinders > 16383)
|
||||
continue;
|
||||
*pheads = heads;
|
||||
*psectors = sectors;
|
||||
*pcylinders = cylinders;
|
||||
#if 0
|
||||
printf("guessed geometry: LCHS=%d %d %d\n",
|
||||
cylinders, heads, sectors);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
static void ide_init2(IDEState *ide_state,
|
||||
BlockDriverState *hd0, BlockDriverState *hd1,
|
||||
qemu_irq irq)
|
||||
{
|
||||
IDEState *s;
|
||||
static int drive_serial = 1;
|
||||
int i, cylinders, heads, secs, translation, lba_detected = 0;
|
||||
int i, cylinders, heads, secs;
|
||||
uint64_t nb_sectors;
|
||||
|
||||
for(i = 0; i < 2; i++) {
|
||||
@ -2750,56 +2694,12 @@ static void ide_init2(IDEState *ide_state,
|
||||
s->bs = hd1;
|
||||
if (s->bs) {
|
||||
bdrv_get_geometry(s->bs, &nb_sectors);
|
||||
bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs);
|
||||
s->cylinders = cylinders;
|
||||
s->heads = heads;
|
||||
s->sectors = secs;
|
||||
s->nb_sectors = nb_sectors;
|
||||
/* if a geometry hint is available, use it */
|
||||
bdrv_get_geometry_hint(s->bs, &cylinders, &heads, &secs);
|
||||
translation = bdrv_get_translation_hint(s->bs);
|
||||
if (cylinders != 0) {
|
||||
s->cylinders = cylinders;
|
||||
s->heads = heads;
|
||||
s->sectors = secs;
|
||||
} else {
|
||||
if (guess_disk_lchs(s, &cylinders, &heads, &secs) == 0) {
|
||||
if (heads > 16) {
|
||||
/* if heads > 16, it means that a BIOS LBA
|
||||
translation was active, so the default
|
||||
hardware geometry is OK */
|
||||
lba_detected = 1;
|
||||
goto default_geometry;
|
||||
} else {
|
||||
s->cylinders = cylinders;
|
||||
s->heads = heads;
|
||||
s->sectors = secs;
|
||||
/* disable any translation to be in sync with
|
||||
the logical geometry */
|
||||
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
||||
bdrv_set_translation_hint(s->bs,
|
||||
BIOS_ATA_TRANSLATION_NONE);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
default_geometry:
|
||||
/* if no geometry, use a standard physical disk geometry */
|
||||
cylinders = nb_sectors / (16 * 63);
|
||||
if (cylinders > 16383)
|
||||
cylinders = 16383;
|
||||
else if (cylinders < 2)
|
||||
cylinders = 2;
|
||||
s->cylinders = cylinders;
|
||||
s->heads = 16;
|
||||
s->sectors = 63;
|
||||
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
|
||||
if ((s->cylinders * s->heads) <= 131072) {
|
||||
bdrv_set_translation_hint(s->bs,
|
||||
BIOS_ATA_TRANSLATION_LARGE);
|
||||
} else {
|
||||
bdrv_set_translation_hint(s->bs,
|
||||
BIOS_ATA_TRANSLATION_LBA);
|
||||
}
|
||||
}
|
||||
}
|
||||
bdrv_set_geometry_hint(s->bs, s->cylinders, s->heads, s->sectors);
|
||||
}
|
||||
|
||||
if (bdrv_get_type_hint(s->bs) == BDRV_TYPE_CDROM) {
|
||||
s->is_cdrom = 1;
|
||||
bdrv_set_change_cb(s->bs, cdrom_change_cb, s);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user