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[int13] Add support for INT 13,4b 

This allows the ELTORITO.SYS driver for MS-DOS to access our emulated
CD-ROM drives.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/5/head
Michael Brown 2011-04-28 00:02:53 +01:00
parent 00d0226fee
commit d75d6f65aa
1 changed files with 46 additions and 4 deletions
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50
src/arch/i386/interface/pcbios/int13.c
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@ -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,
@ -1090,6 +1093,41 @@ static int int13_get_extended_parameters ( struct int13_drive *int13,
return 0;
}
/**
* 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
*
@ -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;