arch/ia64/include/asm/paravirt_patch.h

   1 /******************************************************************************
   2  * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
   3  *                    VA Linux Systems Japan K.K.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 #ifndef __ASM_PARAVIRT_PATCH_H
  22 #define __ASM_PARAVIRT_PATCH_H
  23
  24 #ifdef __ASSEMBLY__
  25
  26         .section .paravirt_branches, "a"
  27         .previous
  28 #define PARAVIRT_PATCH_SITE_BR(type)            \
  29         {                                       \
  30         [1:] ;                                  \
  31         br.cond.sptk.many 2f ;                  \
  32         nop.b 0 ;                               \
  33         nop.b 0;; ;                             \
  34         } ;                                     \
  35         2:                                      \
  36         .xdata8 ".paravirt_branches", 1b, type
  37
  38 #else
  39
  40 #include <linux/stringify.h>
  41 #include <asm/intrinsics.h>
  42
  43 /* for binary patch */
  44 struct paravirt_patch_site_bundle {
  45         void            *sbundle;
  46         void            *ebundle;
  47         unsigned long   type;
  48 };
  49
  50 /* label means the beginning of new bundle */
  51 #define paravirt_alt_bundle(instr, privop)                              \
  52         "\t998:\n"                                                      \
  53         "\t" instr "\n"                                                 \
  54         "\t999:\n"                                                      \
  55         "\t.pushsection .paravirt_bundles, \"a\"\n"                     \
  56         "\t.popsection\n"                                               \
  57         "\t.xdata8 \".paravirt_bundles\", 998b, 999b, "                 \
  58         __stringify(privop) "\n"
  59
  60
  61 struct paravirt_patch_bundle_elem {
  62         const void      *sbundle;
  63         const void      *ebundle;
  64         unsigned long   type;
  65 };
  66
  67
  68 struct paravirt_patch_site_inst {
  69         unsigned long   stag;
  70         unsigned long   etag;
  71         unsigned long   type;
  72 };
  73
  74 #define paravirt_alt_inst(instr, privop)                                \
  75         "\t[998:]\n"                                                    \
  76         "\t" instr "\n"                                                 \
  77         "\t[999:]\n"                                                    \
  78         "\t.pushsection .paravirt_insts, \"a\"\n"                       \
  79         "\t.popsection\n"                                               \
  80         "\t.xdata8 \".paravirt_insts\", 998b, 999b, "                   \
  81         __stringify(privop) "\n"
  82
  83 struct paravirt_patch_site_branch {
  84         unsigned long   tag;
  85         unsigned long   type;
  86 };
  87
  88 struct paravirt_patch_branch_target {
  89         const void      *entry;
  90         unsigned long   type;
  91 };
  92
  93 void
  94 __paravirt_patch_apply_branch(
  95         unsigned long tag, unsigned long type,
  96         const struct paravirt_patch_branch_target *entries,
  97         unsigned int nr_entries);
  98
  99 void
 100 paravirt_patch_reloc_br(unsigned long tag, const void *target);
 101
 102 void
 103 paravirt_patch_reloc_brl(unsigned long tag, const void *target);
 104
 105
 106 #if defined(ASM_SUPPORTED) && defined(CONFIG_PARAVIRT)
 107 unsigned long
 108 ia64_native_patch_bundle(void *sbundle, void *ebundle, unsigned long type);
 109
 110 unsigned long
 111 __paravirt_patch_apply_bundle(void *sbundle, void *ebundle, unsigned long type,
 112                               const struct paravirt_patch_bundle_elem *elems,
 113                               unsigned long nelems,
 114                               const struct paravirt_patch_bundle_elem **found);
 115
 116 void
 117 paravirt_patch_apply_bundle(const struct paravirt_patch_site_bundle *start,
 118                             const struct paravirt_patch_site_bundle *end);
 119
 120 void
 121 paravirt_patch_apply_inst(const struct paravirt_patch_site_inst *start,
 122                           const struct paravirt_patch_site_inst *end);
 123
 124 void paravirt_patch_apply(void);
 125 #else
 126 #define paravirt_patch_apply_bundle(start, end) do { } while (0)
 127 #define paravirt_patch_apply_inst(start, end)   do { } while (0)
 128 #define paravirt_patch_apply()                  do { } while (0)
 129 #endif
 130
 131 #endif /* !__ASSEMBLEY__ */
 132
 133 #endif /* __ASM_PARAVIRT_PATCH_H */
 134
 135 /*
 136  * Local variables:
 137  * mode: C
 138  * c-set-style: "linux"
 139  * c-basic-offset: 8
 140  * tab-width: 8
 141  * indent-tabs-mode: t
 142  * End:
 143  */