err.no Git - linux-2.6/blob - include/asm-powerpc/feature-fixups.h

   1 #ifndef __ASM_POWERPC_FEATURE_FIXUPS_H
   2 #define __ASM_POWERPC_FEATURE_FIXUPS_H
   3
   4 /*
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version
   8  * 2 of the License, or (at your option) any later version.
   9  */
  10
  11 #ifdef __ASSEMBLY__
  12
  13 /*
  14  * Feature section common macros
  15  *
  16  * Note that the entries now contain offsets between the table entry
  17  * and the code rather than absolute code pointers in order to be
  18  * useable with the vdso shared library. There is also an assumption
  19  * that values will be negative, that is, the fixup table has to be
  20  * located after the code it fixes up.
  21  */
  22 #if defined(CONFIG_PPC64) && !defined(__powerpc64__)
  23 /* 64 bits kernel, 32 bits code (ie. vdso32) */
  24 #define FTR_ENTRY_LONG          .llong
  25 #define FTR_ENTRY_OFFSET        .long 0xffffffff; .long
  26 #else
  27 /* 64 bit kernel 64 bit code, or 32 bit kernel 32 bit code */
  28 #define FTR_ENTRY_LONG          PPC_LONG
  29 #define FTR_ENTRY_OFFSET        PPC_LONG
  30 #endif
  31
  32 #define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect)   \
  33 99:                                                     \
  34         .section sect,"a";                              \
  35         .align 3;                                       \
  36 98:                                                     \
  37         FTR_ENTRY_LONG msk;                             \
  38         FTR_ENTRY_LONG val;                             \
  39         FTR_ENTRY_OFFSET label##b-98b;                  \
  40         FTR_ENTRY_OFFSET 99b-98b;                       \
  41         .previous
  42
  43
  44
  45 /* CPU feature dependent sections */
  46 #define BEGIN_FTR_SECTION_NESTED(label) label:
  47 #define BEGIN_FTR_SECTION               BEGIN_FTR_SECTION_NESTED(97)
  48
  49 #define END_FTR_SECTION_NESTED(msk, val, label) \
  50         MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
  51
  52 #define END_FTR_SECTION(msk, val)               \
  53         END_FTR_SECTION_NESTED(msk, val, 97)
  54
  55 #define END_FTR_SECTION_IFSET(msk)      END_FTR_SECTION((msk), (msk))
  56 #define END_FTR_SECTION_IFCLR(msk)      END_FTR_SECTION((msk), 0)
  57
  58
  59 /* Firmware feature dependent sections */
  60 #define BEGIN_FW_FTR_SECTION_NESTED(label)      label:
  61 #define BEGIN_FW_FTR_SECTION                    BEGIN_FW_FTR_SECTION_NESTED(97)
  62
  63 #define END_FW_FTR_SECTION_NESTED(msk, val, label) \
  64         MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
  65
  66 #define END_FW_FTR_SECTION(msk, val)            \
  67         END_FW_FTR_SECTION_NESTED(msk, val, 97)
  68
  69 #define END_FW_FTR_SECTION_IFSET(msk)   END_FW_FTR_SECTION((msk), (msk))
  70 #define END_FW_FTR_SECTION_IFCLR(msk)   END_FW_FTR_SECTION((msk), 0)
  71
  72 #endif /* __ASSEMBLY__ */
  73
  74 #endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */