paravirt_patch.h

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/******************************************************************************
 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
 *                    VA Linux Systems Japan K.K.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef __ASM_PARAVIRT_PATCH_H
#define __ASM_PARAVIRT_PATCH_H

#ifdef __ASSEMBLY__

    .section .paravirt_branches, "a"
    .previous
#define PARAVIRT_PATCH_SITE_BR(type)        \
    {                   \
    [1:] ;                  \
    br.cond.sptk.many 2f ;          \
    nop.b 0 ;               \
    nop.b 0;; ;             \
    } ;                 \
    2:                  \
    .xdata8 ".paravirt_branches", 1b, type

#else

#include <linux/stringify.h>
#include <asm/intrinsics.h>

/* for binary patch */
struct paravirt_patch_site_bundle {
    void        *sbundle;
    void        *ebundle;
    unsigned long   type;
};

/* label means the beginning of new bundle */
#define paravirt_alt_bundle(instr, privop)              \
    "\t998:\n"                          \
    "\t" instr "\n"                         \
    "\t999:\n"                          \
    "\t.pushsection .paravirt_bundles, \"a\"\n"         \
    "\t.popsection\n"                       \
    "\t.xdata8 \".paravirt_bundles\", 998b, 999b, "         \
    __stringify(privop) "\n"


struct paravirt_patch_bundle_elem {
    const void  *sbundle;
    const void  *ebundle;
    unsigned long   type;
};


struct paravirt_patch_site_inst {
    unsigned long   stag;
    unsigned long   etag;
    unsigned long   type;
};

#define paravirt_alt_inst(instr, privop)                \
    "\t[998:]\n"                            \
    "\t" instr "\n"                         \
    "\t[999:]\n"                            \
    "\t.pushsection .paravirt_insts, \"a\"\n"           \
    "\t.popsection\n"                       \
    "\t.xdata8 \".paravirt_insts\", 998b, 999b, "           \
    __stringify(privop) "\n"

struct paravirt_patch_site_branch {
    unsigned long   tag;
    unsigned long   type;
};

struct paravirt_patch_branch_target {
    const void  *entry;
    unsigned long   type;
};

void
__paravirt_patch_apply_branch(
    unsigned long tag, unsigned long type,
    const struct paravirt_patch_branch_target *entries,
    unsigned int nr_entries);

void
paravirt_patch_reloc_br(unsigned long tag, const void *target);

void
paravirt_patch_reloc_brl(unsigned long tag, const void *target);


#if defined(ASM_SUPPORTED) && defined(CONFIG_PARAVIRT)
unsigned long
ia64_native_patch_bundle(void *sbundle, void *ebundle, unsigned long type);

unsigned long
__paravirt_patch_apply_bundle(void *sbundle, void *ebundle, unsigned long type,
                  const struct paravirt_patch_bundle_elem *elems,
                  unsigned long nelems,
                  const struct paravirt_patch_bundle_elem **found);

void
paravirt_patch_apply_bundle(const struct paravirt_patch_site_bundle *start,
                const struct paravirt_patch_site_bundle *end);

void
paravirt_patch_apply_inst(const struct paravirt_patch_site_inst *start,
              const struct paravirt_patch_site_inst *end);

void paravirt_patch_apply(void);
#else
#define paravirt_patch_apply_bundle(start, end) do { } while (0)
#define paravirt_patch_apply_inst(start, end)   do { } while (0)
#define paravirt_patch_apply()          do { } while (0)
#endif

#endif /* !__ASSEMBLEY__ */

#endif /* __ASM_PARAVIRT_PATCH_H */

/*
 * Local variables:
 * mode: C
 * c-set-style: "linux"
 * c-basic-offset: 8
 * tab-width: 8
 * indent-tabs-mode: t
 * End:
 */