Revision 46d4767d hw/ide.c
| b/hw/ide.c | ||
|---|---|---|
| 1826 | 1826 |
uint32_t nr_sects; /* nr of sectors in partition */ |
| 1827 | 1827 |
} __attribute__((packed)); |
| 1828 | 1828 |
|
| 1829 |
/* try to guess the IDE geometry from the MSDOS partition table */ |
|
| 1829 |
/* try to guess the IDE physical geometry from the MSDOS partition table */
|
|
| 1830 | 1830 |
static void ide_guess_geometry(IDEState *s) |
| 1831 | 1831 |
{
|
| 1832 | 1832 |
uint8_t buf[512]; |
| 1833 |
int ret, i; |
|
| 1833 |
int ret, i, heads, sectors, cylinders;
|
|
| 1834 | 1834 |
struct partition *p; |
| 1835 | 1835 |
uint32_t nr_sects; |
| 1836 | 1836 |
|
| ... | ... | |
| 1848 | 1848 |
if (nr_sects && p->end_head) {
|
| 1849 | 1849 |
/* We make the assumption that the partition terminates on |
| 1850 | 1850 |
a cylinder boundary */ |
| 1851 |
s->heads = p->end_head + 1; |
|
| 1852 |
s->sectors = p->end_sector & 63; |
|
| 1853 |
s->cylinders = s->nb_sectors / (s->heads * s->sectors); |
|
| 1851 |
heads = p->end_head + 1; |
|
| 1852 |
if (heads < 1 || heads > 16) |
|
| 1853 |
continue; |
|
| 1854 |
sectors = p->end_sector & 63; |
|
| 1855 |
if (sectors == 0) |
|
| 1856 |
continue; |
|
| 1857 |
cylinders = s->nb_sectors / (heads * sectors); |
|
| 1858 |
if (cylinders < 1 || cylinders > 16383) |
|
| 1859 |
continue; |
|
| 1860 |
s->heads = heads; |
|
| 1861 |
s->sectors = sectors; |
|
| 1862 |
s->cylinders = cylinders; |
|
| 1854 | 1863 |
#if 0 |
| 1855 | 1864 |
printf("guessed partition: CHS=%d %d %d\n",
|
| 1856 | 1865 |
s->cylinders, s->heads, s->sectors); |
| ... | ... | |
| 1885 | 1894 |
} else {
|
| 1886 | 1895 |
ide_guess_geometry(s); |
| 1887 | 1896 |
if (s->cylinders == 0) {
|
| 1888 |
/* if no geometry, use a LBA compatible one */
|
|
| 1897 |
/* if no geometry, use a standard physical disk geometry */
|
|
| 1889 | 1898 |
cylinders = nb_sectors / (16 * 63); |
| 1890 | 1899 |
if (cylinders > 16383) |
| 1891 | 1900 |
cylinders = 16383; |
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