features.h

/*
 * Copyright (C) 2005 Philippe Gerum <rpm@xenomai.org>.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#ifndef _COBALT_UAPI_ASM_GENERIC_FEATURES_H
#define _COBALT_UAPI_ASM_GENERIC_FEATURES_H
 
#include <linux/types.h>
 
#define XNFEAT_STRING_LEN 64
 
struct cobalt_featinfo {
        /* Used to be real-time clock frequency. */
        __u64 __reserved1;
        /* Used to be vdso_offset. */
        __u32 __reserved2;
        __u32 feat_abirev;
        __u32 feat_all;
        __u32 feat_man;
        __u32 feat_req;
        __u32 feat_mis;
        char feat_all_s[XNFEAT_STRING_LEN];
        char feat_man_s[XNFEAT_STRING_LEN];
        char feat_req_s[XNFEAT_STRING_LEN];
        char feat_mis_s[XNFEAT_STRING_LEN];
        /* Architecture-specific features. */
        struct cobalt_featinfo_archdep feat_arch;
};
 
#define __xn_feat_smp         0x80000000
#define __xn_feat_nosmp       0x40000000
#define __xn_feat_fastsynch   0x20000000
#define __xn_feat_nofastsynch 0x10000000
#define __xn_feat_control     0x08000000
#define __xn_feat_prioceiling 0x04000000
 
#ifdef CONFIG_SMP
#define __xn_feat_smp_mask __xn_feat_smp
#else
#define __xn_feat_smp_mask __xn_feat_nosmp
#endif
 
/*
 * Revisit: all archs currently support fast locking, and there is no
 * reason for any future port not to provide this. This will be
 * written in stone at the next ABI update, when fastsynch support is
 * dropped from the optional feature set.
 */
#define __xn_feat_fastsynch_mask __xn_feat_fastsynch
 
/* List of generic features kernel or userland may support */
#define __xn_feat_generic_mask                  \
        (__xn_feat_smp_mask             |       \
         __xn_feat_fastsynch_mask       |       \
         __xn_feat_prioceiling)
 
/*
 * List of features both sides have to agree on: If userland supports
 * it, the kernel has to provide it, too. This means backward
 * compatibility between older userland and newer kernel may be
 * supported for those features, but forward compatibility between
 * newer userland and older kernel cannot.
 */
#define __xn_feat_generic_man_mask              \
        (__xn_feat_fastsynch            |       \
         __xn_feat_nofastsynch          |       \
         __xn_feat_nosmp                |       \
         __xn_feat_prioceiling)
 
static inline
const char *get_generic_feature_label(unsigned int feature)
{
        switch (feature) {
        case __xn_feat_smp:
                return "smp";
        case __xn_feat_nosmp:
                return "nosmp";
        case __xn_feat_fastsynch:
                return "fastsynch";
        case __xn_feat_nofastsynch:
                return "nofastsynch";
        case __xn_feat_control:
                return "control";
        case __xn_feat_prioceiling:
                return "prioceiling";
        default:
                return 0;
        }
}
 
static inline int check_abi_revision(unsigned long abirev)
{
        return abirev == XENOMAI_ABI_REV;
}
 
#endif /* !_COBALT_UAPI_ASM_GENERIC_FEATURES_H */