diff options
Diffstat (limited to 'mubios/services/int13.c')
| -rw-r--r-- | mubios/services/int13.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/mubios/services/int13.c b/mubios/services/int13.c index 033a045..7186377 100644 --- a/mubios/services/int13.c +++ b/mubios/services/int13.c @@ -137,9 +137,9 @@ int13_service (struct bios_regs *regs) head = (u8)(regs->edx >> 8); if ((regs->edx & 0x00FFu) != BIOS_HARD_DISK || count == 0u - || get_ata_geometry (&geometry) != 0 - || sector == 0u || sector > geometry.sectors_per_track - || head >= geometry.heads || cylinder >= geometry.cylinders) + || get_ata_geometry (&geometry) != 0 || sector == 0u + || sector > geometry.sectors_per_track || head >= geometry.heads + || cylinder >= geometry.cylinders) { int13_fail (regs); return; @@ -152,9 +152,9 @@ int13_service (struct bios_regs *regs) } lba = (((u32)cylinder * geometry.heads) + head) - * geometry.sectors_per_track + (u32)sector - 1u; - buffer_address - = ((u32)regs->es << 4) + (u16)regs->ebx; + * geometry.sectors_per_track + + (u32)sector - 1u; + buffer_address = ((u32)regs->es << 4) + (u16)regs->ebx; if (ata_read_sectors28 (lba, (u16 *)buffer_address, count) != 0) { @@ -188,8 +188,7 @@ int13_service (struct bios_regs *regs) max_head = (u8)(geometry.heads - 1u); sectors_per_track = (u8)geometry.sectors_per_track; regs->eax &= 0xFFFF0000u; - regs->ecx = (regs->ecx & 0xFFFF0000u) - | (u32)(sectors_per_track & 0x3Fu) + regs->ecx = (regs->ecx & 0xFFFF0000u) | (u32)(sectors_per_track & 0x3Fu) | ((u32)(max_cylinder & 0x00FFu) << 8) | ((u32)(max_cylinder >> 8) << 14); regs->edx = (regs->edx & 0xFFFF0000u) | ((u32)max_head << 8) | 1u; |