source: bootcd/isolinux/syslinux-6.03/gpxe/src/include/gpxe/features.h

#ifndef _GPXE_FEATURES_H
#define _GPXE_FEATURES_H

#include <stdint.h>
#include <gpxe/tables.h>
#include <gpxe/dhcp.h>

/** @file
 *
 * Feature list
 *
 */

FILE_LICENCE ( GPL2_OR_LATER );

/**
 * @defgroup featurecat Feature categories
 * @{
 */

#define FEATURE_PROTOCOL                01 /**< Network protocols */
#define FEATURE_IMAGE                   02 /**< Image formats */
#define FEATURE_MISC                    03 /**< Miscellaneous */

/** @} */

/**
 * @defgroup dhcpfeatures DHCP feature option tags
 *
 * DHCP feature option tags are Etherboot encapsulated options in the
 * range 0x10-0x7f.
 *
 * @{
 */

#define DHCP_EB_FEATURE_PXE_EXT         0x10 /**< PXE API extensions */
#define DHCP_EB_FEATURE_ISCSI           0x11 /**< iSCSI protocol */
#define DHCP_EB_FEATURE_AOE             0x12 /**< AoE protocol */
#define DHCP_EB_FEATURE_HTTP            0x13 /**< HTTP protocol */
#define DHCP_EB_FEATURE_HTTPS           0x14 /**< HTTPS protocol */
#define DHCP_EB_FEATURE_TFTP            0x15 /**< TFTP protocol */
#define DHCP_EB_FEATURE_FTP             0x16 /**< FTP protocol */
#define DHCP_EB_FEATURE_DNS             0x17 /**< DNS protocol */
#define DHCP_EB_FEATURE_BZIMAGE         0x18 /**< bzImage format */
#define DHCP_EB_FEATURE_MULTIBOOT       0x19 /**< Multiboot format */
#define DHCP_EB_FEATURE_SLAM            0x1a /**< SLAM protocol */
#define DHCP_EB_FEATURE_SRP             0x1b /**< SRP protocol */
#define DHCP_EB_FEATURE_NBI             0x20 /**< NBI format */
#define DHCP_EB_FEATURE_PXE             0x21 /**< PXE format */
#define DHCP_EB_FEATURE_ELF             0x22 /**< ELF format */
#define DHCP_EB_FEATURE_COMBOOT         0x23 /**< COMBOOT format */
#define DHCP_EB_FEATURE_EFI             0x24 /**< EFI format */

/** @} */

/** DHCP feature table */
#define DHCP_FEATURES __table ( uint8_t, "dhcp_features" )

/** Declare a feature code for DHCP */
#define __dhcp_feature __table_entry ( DHCP_FEATURES, 01 )

/** Construct a DHCP feature table entry */
#define DHCP_FEATURE( feature_opt, ... )                                    \
        _DHCP_FEATURE ( OBJECT, feature_opt, __VA_ARGS__ )
#define _DHCP_FEATURE( _name, feature_opt, ... )                            \
        __DHCP_FEATURE ( _name, feature_opt, __VA_ARGS__ )
#define __DHCP_FEATURE( _name, feature_opt, ... )                           \
        uint8_t __dhcp_feature_ ## _name [] __dhcp_feature = {              \
                feature_opt, DHCP_OPTION ( __VA_ARGS__ )                    \
        };

/** A named feature */
struct feature {
        /** Feature name */
        char *name;
};

/** Named feature table */
#define FEATURES __table ( struct feature, "features" )

/** Declare a named feature */
#define __feature_name( category ) __table_entry ( FEATURES, category )

/** Construct a named feature */
#define FEATURE_NAME( category, text )                                      \
        _FEATURE_NAME ( category, OBJECT, text )
#define _FEATURE_NAME( category, _name, text )                              \
        __FEATURE_NAME ( category, _name, text )
#define __FEATURE_NAME( category, _name, text )                             \
        struct feature __feature_ ## _name __feature_name ( category ) = {  \
                .name = text,                                               \
        };

/** Declare a feature */
#define FEATURE( category, text, feature_opt, version )                     \
        FEATURE_NAME ( category, text );                                    \
        DHCP_FEATURE ( feature_opt, version );

/** Declare the version number feature */
#define FEATURE_VERSION( ... )                                              \
        DHCP_FEATURE ( DHCP_ENCAPSULATED ( DHCP_EB_VERSION ), __VA_ARGS__ )

#endif /* _GPXE_FEATURES_H */