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disable automatic BIOS translation if the logical disk geometry implies it

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1154 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-11-17 22:35:32 +00:00
parent 46d4767d93
commit bf1b938fce
1 changed files with 33 additions and 16 deletions
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49
hw/ide.c
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@ -1826,22 +1826,21 @@ struct partition {
uint32_t nr_sects; /* nr of sectors in partition */
} __attribute__((packed));
/* try to guess the IDE physical geometry from the MSDOS partition table */
static void ide_guess_geometry(IDEState *s)
/* 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[512];
int ret, i, heads, sectors, cylinders;
struct partition *p;
uint32_t nr_sects;
if (s->cylinders != 0)
return;
ret = bdrv_read(s->bs, 0, buf, 1);
if (ret < 0)
return;
return -1;
/* test msdos magic */
if (buf[510] != 0x55 || buf[511] != 0xaa)
return;
return -1;
for(i = 0; i < 4; i++) {
p = ((struct partition *)(buf + 0x1be)) + i;
nr_sects = le32_to_cpu(p->nr_sects);
@ -1849,23 +1848,23 @@ static void ide_guess_geometry(IDEState *s)
/* We make the assumption that the partition terminates on
a cylinder boundary */
heads = p->end_head + 1;
if (heads < 1 || heads > 16)
continue;
sectors = p->end_sector & 63;
if (sectors == 0)
continue;
cylinders = s->nb_sectors / (heads * sectors);
if (cylinders < 1 || cylinders > 16383)
continue;
s->heads = heads;
s->sectors = sectors;
s->cylinders = cylinders;
*pheads = heads;
*psectors = sectors;
*pcylinders = cylinders;
#if 0
printf("guessed partition: CHS=%d %d %d\n",
s->cylinders, s->heads, s->sectors);
printf("guessed geometry: LCHS=%d %d %d\n",
cylinders, heads, sectors);
#endif
return 0;
}
}
return -1;
}
static void ide_init2(IDEState *ide_state, int irq,
@ -1873,7 +1872,7 @@ static void ide_init2(IDEState *ide_state, int irq,
{
IDEState *s;
static int drive_serial = 1;
int i, cylinders, heads, secs;
int i, cylinders, heads, secs, translation;
int64_t nb_sectors;
for(i = 0; i < 2; i++) {
@ -1892,8 +1891,26 @@ static void ide_init2(IDEState *ide_state, int irq,
s->heads = heads;
s->sectors = secs;
} else {
ide_guess_geometry(s);
if (s->cylinders == 0) {
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 */
goto default_geometry;
} else {
s->cylinders = cylinders;
s->heads = heads;
s->sectors = secs;
/* disable any translation to be in sync with
the logical geometry */
translation = bdrv_get_translation_hint(s->bs);
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)