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[int13] Allow drive to be hooked using the natural drive number

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Interpret the maximum drive number (0xff for hard disks, 0x7f for
floppy disks) as meaning "use natural drive number".

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2016-03-20 09:16:13 +00:00
parent 311a5732c8
commit ab5b3abbba
3 changed files with 13 additions and 7 deletions
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8
src/arch/x86/interface/pcbios/int13.c
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@@ -1588,7 +1588,7 @@ static void int13_free ( struct refcnt *refcnt ) {
*
* @v uri URI
* @v drive Drive number
* @ret rc Return status code
* @ret drive Drive number, or negative error
*
* Registers the drive with the INT 13 emulation subsystem, and hooks
* the INT 13 interrupt vector (if not already hooked).
@@ -1603,6 +1603,10 @@ static int int13_hook ( struct uri *uri, unsigned int drive ) {
int13_sync_num_drives();
natural_drive = ( ( drive & 0x80 ) ? ( num_drives | 0x80 ) : num_fdds );
/* Use natural drive number if directed to do so */
if ( ( drive & 0x7f ) == 0x7f )
drive = natural_drive;
/* Check that drive number is not in use */
list_for_each_entry ( int13, &int13s, list ) {
if ( int13->drive == drive ) {
@@ -1661,7 +1665,7 @@ static int int13_hook ( struct uri *uri, unsigned int drive ) {
int13_sync_num_drives();
free ( scratch );
return 0;
return drive;
err_guess_geometry:
err_parse_iso9660: