[int13] Allow default drive to be specified via "san-drive" setting
The DHCP option 175.189 has been defined (by us) since 2006 as containing the drive number to be used for a SAN boot, but has never been automatically used as such by iPXE. Use this option (if specified) to override the default SAN drive number. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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@ -15,15 +15,4 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#define SANBOOT_PREFIX_pcbios __pcbios_
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#endif
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/**
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* Get default SAN drive number
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*
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* @ret drive Default drive number
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*/
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static inline __always_inline unsigned int
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SANBOOT_INLINE ( pcbios, san_default_drive ) ( void ) {
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/* Default to booting from first hard disk */
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return 0x80;
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}
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#endif /* _IPXE_BIOS_SANBOOT_H */
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@ -44,6 +44,8 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <ipxe/pci.h>
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#include <ipxe/iso9660.h>
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#include <ipxe/eltorito.h>
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#include <ipxe/dhcp.h>
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#include <ipxe/settings.h>
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#include <realmode.h>
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#include <bios.h>
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#include <biosint.h>
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@ -1986,7 +1988,32 @@ static int int13_describe ( unsigned int drive ) {
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return 0;
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}
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PROVIDE_SANBOOT_INLINE ( pcbios, san_default_drive );
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/** The "san-drive" setting */
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const struct setting san_drive_setting __setting ( SETTING_SANBOOT_EXTRA,
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san-drive ) = {
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.name = "san-drive",
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.description = "SAN drive number",
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.tag = DHCP_EB_SAN_DRIVE,
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.type = &setting_type_uint8,
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};
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/**
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* Get default SAN drive number
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*
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* @ret drive Default drive number
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*/
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static unsigned int int13_default_drive ( void ) {
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unsigned long drive;
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/* Use "san-drive" setting, if specified */
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if ( fetch_uint_setting ( NULL, &san_drive_setting, &drive ) >= 0 )
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return drive;
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/* Otherwise, default to booting from first hard disk */
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return 0x80;
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}
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PROVIDE_SANBOOT ( pcbios, san_default_drive, int13_default_drive );
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PROVIDE_SANBOOT ( pcbios, san_hook, int13_hook );
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PROVIDE_SANBOOT ( pcbios, san_unhook, int13_unhook );
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PROVIDE_SANBOOT ( pcbios, san_boot, int13_boot );
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@ -403,12 +403,12 @@ struct dhcp_netdev_desc {
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/** Use cached network settings (obsolete; do not reuse this value) */
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#define DHCP_EB_USE_CACHED DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xb2 )
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/** BIOS drive number
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/** SAN drive number
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*
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* This is the drive number for a drive emulated via INT 13. 0x80 is
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* This is the drive number for a SAN-hooked drive. For BIOS, 0x80 is
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* the first hard disk, 0x81 is the second hard disk, etc.
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*/
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#define DHCP_EB_BIOS_DRIVE DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xbd )
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#define DHCP_EB_SAN_DRIVE DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xbd )
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/** Username
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*
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