diff options
| -rw-r--r-- | src/arch/i386/interface/pcbios/int13.c | 50 |
1 files changed, 46 insertions, 4 deletions
diff --git a/src/arch/i386/interface/pcbios/int13.c b/src/arch/i386/interface/pcbios/int13.c index 3af3652e0..93d01088f 100644 --- a/src/arch/i386/interface/pcbios/int13.c +++ b/src/arch/i386/interface/pcbios/int13.c @@ -124,6 +124,8 @@ struct int13_drive { */ unsigned int sectors_per_track; + /** Drive is a CD-ROM */ + int is_cdrom; /** Address of El Torito boot catalog (if any) */ unsigned int boot_catalog; @@ -468,6 +470,7 @@ static int int13_parse_iso9660 ( struct int13_drive *int13, void *scratch ) { return 0; DBGC ( int13, "INT13 drive %02x contains an ISO9660 filesystem; " "treating as CD-ROM\n", int13->drive ); + int13->is_cdrom = 1; /* Read boot record volume descriptor */ if ( ( rc = int13_rw ( int13, @@ -1091,6 +1094,41 @@ static int int13_get_extended_parameters ( struct int13_drive *int13, } /** + * INT 13, 4b - Get status or terminate CD-ROM emulation + * + * @v int13 Emulated drive + * @v ds:si Specification packet + * @ret status Status code + */ +static int int13_cdrom_status_terminate ( struct int13_drive *int13, + struct i386_all_regs *ix86 ) { + struct int13_cdrom_specification specification; + + DBGC2 ( int13, "Get CD-ROM emulation status to %04x:%04x%s\n", + ix86->segs.ds, ix86->regs.si, + ( ix86->regs.al ? "" : " and terminate" ) ); + + /* Fail if we are not a CD-ROM */ + if ( ! int13->is_cdrom ) { + DBGC ( int13, "INT13 drive %02x is not a CD-ROM\n", + int13->drive ); + return -INT13_STATUS_INVALID; + } + + /* Build specification packet */ + memset ( &specification, 0, sizeof ( specification ) ); + specification.size = sizeof ( specification ); + specification.drive = int13->drive; + + /* Return specification packet */ + copy_to_real ( ix86->segs.ds, ix86->regs.si, &specification, + sizeof ( specification ) ); + + return 0; +} + + +/** * INT 13, 4d - Read CD-ROM boot catalog * * @v int13 Emulated drive @@ -1102,6 +1140,11 @@ static int int13_cdrom_read_boot_catalog ( struct int13_drive *int13, struct int13_cdrom_boot_catalog_command command; int rc; + /* Read parameters from command packet */ + copy_from_real ( &command, ix86->segs.ds, ix86->regs.si, + sizeof ( command ) ); + DBGC2 ( int13, "Read CD-ROM boot catalog to %08x\n", command.buffer ); + /* Fail if we have no boot catalog */ if ( ! int13->boot_catalog ) { DBGC ( int13, "INT13 drive %02x has no boot catalog\n", @@ -1109,10 +1152,6 @@ static int int13_cdrom_read_boot_catalog ( struct int13_drive *int13, return -INT13_STATUS_INVALID; } - /* Read parameters from command packet */ - copy_from_real ( &command, ix86->segs.ds, ix86->regs.si, - sizeof ( command ) ); - /* Read from boot catalog */ if ( ( rc = int13_rw ( int13, ( int13->boot_catalog + command.start ), command.count, phys_to_user ( command.buffer ), @@ -1192,6 +1231,9 @@ static __asmcall void int13 ( struct i386_all_regs *ix86 ) { case INT13_GET_EXTENDED_PARAMETERS: status = int13_get_extended_parameters ( int13, ix86 ); break; + case INT13_CDROM_STATUS_TERMINATE: + status = int13_cdrom_status_terminate ( int13, ix86 ); + break; case INT13_CDROM_READ_BOOT_CATALOG: status = int13_cdrom_read_boot_catalog ( int13, ix86 ); break; |