arch/powerpc/include/asm/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 /*
  12  * Feature section common macros
  13  *
  14  * Note that the entries now contain offsets between the table entry
  15  * and the code rather than absolute code pointers in order to be
  16  * useable with the vdso shared library. There is also an assumption
  17  * that values will be negative, that is, the fixup table has to be
  18  * located after the code it fixes up.
  19  */
  20 #if defined(CONFIG_PPC64) && !defined(__powerpc64__)
  21 /* 64 bits kernel, 32 bits code (ie. vdso32) */
  22 #define FTR_ENTRY_LONG          .llong
  23 #define FTR_ENTRY_OFFSET        .long 0xffffffff; .long
  24 #elif defined(CONFIG_PPC64)
  25 #define FTR_ENTRY_LONG          .llong
  26 #define FTR_ENTRY_OFFSET        .llong
  27 #else
  28 #define FTR_ENTRY_LONG          .long
  29 #define FTR_ENTRY_OFFSET        .long
  30 #endif
  31
  32 #define START_FTR_SECTION(label)        label##1:
  33
  34 #define FTR_SECTION_ELSE_NESTED(label)                  \
  35 label##2:                                               \
  36         .pushsection __ftr_alt_##label,"a";             \
  37         .align 2;                                       \
  38 label##3:
  39
  40 #define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect)   \
  41 label##4:                                               \
  42         .popsection;                                    \
  43         .pushsection sect,"a";                          \
  44         .align 3;                                       \
  45 label##5:                                               \
  46         FTR_ENTRY_LONG msk;                             \
  47         FTR_ENTRY_LONG val;                             \
  48         FTR_ENTRY_OFFSET label##1b-label##5b;           \
  49         FTR_ENTRY_OFFSET label##2b-label##5b;           \
  50         FTR_ENTRY_OFFSET label##3b-label##5b;           \
  51         FTR_ENTRY_OFFSET label##4b-label##5b;           \
  52         .popsection;
  53
  54
  55 /* CPU feature dependent sections */
  56 #define BEGIN_FTR_SECTION_NESTED(label) START_FTR_SECTION(label)
  57 #define BEGIN_FTR_SECTION               START_FTR_SECTION(97)
  58
  59 #define END_FTR_SECTION_NESTED(msk, val, label)                 \
  60         FTR_SECTION_ELSE_NESTED(label)                          \
  61         MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
  62
  63 #define END_FTR_SECTION(msk, val)               \
  64         END_FTR_SECTION_NESTED(msk, val, 97)
  65
  66 #define END_FTR_SECTION_IFSET(msk)      END_FTR_SECTION((msk), (msk))
  67 #define END_FTR_SECTION_IFCLR(msk)      END_FTR_SECTION((msk), 0)
  68
  69 /* CPU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
  70 #define FTR_SECTION_ELSE        FTR_SECTION_ELSE_NESTED(97)
  71 #define ALT_FTR_SECTION_END_NESTED(msk, val, label)     \
  72         MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
  73 #define ALT_FTR_SECTION_END_NESTED_IFSET(msk, label)    \
  74         ALT_FTR_SECTION_END_NESTED(msk, msk, label)
  75 #define ALT_FTR_SECTION_END_NESTED_IFCLR(msk, label)    \
  76         ALT_FTR_SECTION_END_NESTED(msk, 0, label)
  77 #define ALT_FTR_SECTION_END(msk, val)   \
  78         ALT_FTR_SECTION_END_NESTED(msk, val, 97)
  79 #define ALT_FTR_SECTION_END_IFSET(msk)  \
  80         ALT_FTR_SECTION_END_NESTED_IFSET(msk, 97)
  81 #define ALT_FTR_SECTION_END_IFCLR(msk)  \
  82         ALT_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
  83
  84 /* MMU feature dependent sections */
  85 #define BEGIN_MMU_FTR_SECTION_NESTED(label)     START_FTR_SECTION(label)
  86 #define BEGIN_MMU_FTR_SECTION                   START_FTR_SECTION(97)
  87
  88 #define END_MMU_FTR_SECTION_NESTED(msk, val, label)             \
  89         FTR_SECTION_ELSE_NESTED(label)                          \
  90         MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
  91
  92 #define END_MMU_FTR_SECTION(msk, val)           \
  93         END_MMU_FTR_SECTION_NESTED(msk, val, 97)
  94
  95 #define END_MMU_FTR_SECTION_IFSET(msk)  END_MMU_FTR_SECTION((msk), (msk))
  96 #define END_MMU_FTR_SECTION_IFCLR(msk)  END_MMU_FTR_SECTION((msk), 0)
  97
  98 /* MMU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
  99 #define MMU_FTR_SECTION_ELSE_NESTED(label)      FTR_SECTION_ELSE_NESTED(label)
 100 #define MMU_FTR_SECTION_ELSE    MMU_FTR_SECTION_ELSE_NESTED(97)
 101 #define ALT_MMU_FTR_SECTION_END_NESTED(msk, val, label) \
 102         MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
 103 #define ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, label)        \
 104         ALT_MMU_FTR_SECTION_END_NESTED(msk, msk, label)
 105 #define ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, label)        \
 106         ALT_MMU_FTR_SECTION_END_NESTED(msk, 0, label)
 107 #define ALT_MMU_FTR_SECTION_END(msk, val)       \
 108         ALT_MMU_FTR_SECTION_END_NESTED(msk, val, 97)
 109 #define ALT_MMU_FTR_SECTION_END_IFSET(msk)      \
 110         ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, 97)
 111 #define ALT_MMU_FTR_SECTION_END_IFCLR(msk)      \
 112         ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
 113
 114 /* Firmware feature dependent sections */
 115 #define BEGIN_FW_FTR_SECTION_NESTED(label)      START_FTR_SECTION(label)
 116 #define BEGIN_FW_FTR_SECTION                    START_FTR_SECTION(97)
 117
 118 #define END_FW_FTR_SECTION_NESTED(msk, val, label)              \
 119         FTR_SECTION_ELSE_NESTED(label)                          \
 120         MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
 121
 122 #define END_FW_FTR_SECTION(msk, val)            \
 123         END_FW_FTR_SECTION_NESTED(msk, val, 97)
 124
 125 #define END_FW_FTR_SECTION_IFSET(msk)   END_FW_FTR_SECTION((msk), (msk))
 126 #define END_FW_FTR_SECTION_IFCLR(msk)   END_FW_FTR_SECTION((msk), 0)
 127
 128 /* Firmware feature sections with alternatives */
 129 #define FW_FTR_SECTION_ELSE_NESTED(label)       FTR_SECTION_ELSE_NESTED(label)
 130 #define FW_FTR_SECTION_ELSE     FTR_SECTION_ELSE_NESTED(97)
 131 #define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label)  \
 132         MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
 133 #define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label) \
 134         ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label)
 135 #define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label) \
 136         ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label)
 137 #define ALT_FW_FTR_SECTION_END(msk, val)        \
 138         ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97)
 139 #define ALT_FW_FTR_SECTION_END_IFSET(msk)       \
 140         ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97)
 141 #define ALT_FW_FTR_SECTION_END_IFCLR(msk)       \
 142         ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
 143
 144 #ifndef __ASSEMBLY__
 145
 146 #define ASM_MMU_FTR_IF(section_if, section_else, msk, val)      \
 147         stringify_in_c(BEGIN_MMU_FTR_SECTION)                   \
 148         section_if "; "                                         \
 149         stringify_in_c(MMU_FTR_SECTION_ELSE)                    \
 150         section_else "; "                                       \
 151         stringify_in_c(ALT_MMU_FTR_SECTION_END((msk), (val)))
 152
 153 #define ASM_MMU_FTR_IFSET(section_if, section_else, msk)        \
 154         ASM_MMU_FTR_IF(section_if, section_else, (msk), (msk))
 155
 156 #define ASM_MMU_FTR_IFCLR(section_if, section_else, msk)        \
 157         ASM_MMU_FTR_IF(section_if, section_else, (msk), 0)
 158
 159 #endif /* __ASSEMBLY__ */
 160
 161 /* LWSYNC feature sections */
 162 #define START_LWSYNC_SECTION(label)     label##1:
 163 #define MAKE_LWSYNC_SECTION_ENTRY(label, sect)          \
 164 label##2:                                               \
 165         .pushsection sect,"a";                          \
 166         .align 2;                                       \
 167 label##3:                                               \
 168         FTR_ENTRY_OFFSET label##1b-label##3b;           \
 169         .popsection;
 170
 171 #endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */