Skip to content

initdisk.c: work around Xi8088 ROM-BIOS bug for int 13.41 [fixes #156] #224

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Oct 10, 2025
Merged

initdisk.c: work around Xi8088 ROM-BIOS bug for int 13.41 [fixes #156] #224

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 4 additions & 0 deletions kernel/initdisk.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -652,6 +652,10 @@ STATIC int LBA_Get_Drive_Parameters(int drive, struct DriveParamS *driveParam, i
regs.b.x = 0x55aa;
regs.a.b.h = 0x41;
regs.d.b.l = drive;
regs.ds = 0x40;
/* ds = 40h is to work around a Xi8088 ROM-BIOS bug,
refer to https://github.com/FDOS/kernel/issues/156
and https://www.bttr-software.de/forum/forum_entry.php?id=21275 */
regs.flags = FLG_CARRY; /* ensure carry is set to force error if unsupported */

init_call_intr(0x13, &regs);
Expand Down