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[block] Centralise "san-drive" setting

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The concept of the SAN drive number is meaningful only in a BIOS
environment, where it represents the INT13 drive number (0x80 for the
first hard disk).  We retain this concept in a UEFI environment to
allow for a simple way for iPXE commands to refer to SAN drives.

Centralise the concept of the default drive number, since it is shared
between all supported environments.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2017-03-06 12:25:20 +00:00
parent 4adc7b0290
commit e7ee2eda4b
7 changed files with 40 additions and 51 deletions
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39
src/core/sanboot.c
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@@ -39,8 +39,20 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/timer.h>
#include <ipxe/process.h>
#include <ipxe/iso9660.h>
#include <ipxe/dhcp.h>
#include <ipxe/settings.h>
#include <ipxe/sanboot.h>
/**
* Default SAN drive number
*
* The drive number is a meaningful concept only in a BIOS
* environment, where it represents the INT13 drive number (0x80 for
* the first hard disk). We retain it in other environments to allow
* for a simple way for iPXE commands to refer to SAN drives.
*/
#define SAN_DEFAULT_DRIVE 0x80
/**
* Timeout for block device commands (in ticks)
*
@@ -541,6 +553,7 @@ int register_sandev ( struct san_device *sandev ) {
/* Add to list of SAN devices */
list_add_tail ( &sandev->list, &san_devices );
DBGC ( sandev, "SAN %#02x registered\n", sandev->drive );
return 0;
}
@@ -560,4 +573,30 @@ void unregister_sandev ( struct san_device *sandev ) {
/* Remove from list of SAN devices */
list_del ( &sandev->list );
DBGC ( sandev, "SAN %#02x unregistered\n", sandev->drive );
}
/** The "san-drive" setting */
const struct setting san_drive_setting __setting ( SETTING_SANBOOT_EXTRA,
san-drive ) = {
.name = "san-drive",
.description = "SAN drive number",
.tag = DHCP_EB_SAN_DRIVE,
.type = &setting_type_uint8,
};
/**
* Get default SAN drive number
*
* @ret drive Default drive number
*/
unsigned int san_default_drive ( void ) {
unsigned long drive;
/* Use "san-drive" setting, if specified */
if ( fetch_uint_setting ( NULL, &san_drive_setting, &drive ) >= 0 )
return drive;
/* Otherwise, default to booting from first hard disk */
return SAN_DEFAULT_DRIVE;
}