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         .ifgt (label##4b- label##3b)-(label##2b- label##1b);    \
  53         .error "Feature section else case larger than body";    \
  54         .endif;                                                 \
  55         .popsection;
  56
  57
  58 /* CPU feature dependent sections */
  59 #define BEGIN_FTR_SECTION_NESTED(label) START_FTR_SECTION(label)
  60 #define BEGIN_FTR_SECTION               START_FTR_SECTION(97)
  61
  62 #define END_FTR_SECTION_NESTED(msk, val, label)                 \
  63         FTR_SECTION_ELSE_NESTED(label)                          \
  64         MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
  65
  66 #define END_FTR_SECTION(msk, val)               \
  67         END_FTR_SECTION_NESTED(msk, val, 97)
  68
  69 #define END_FTR_SECTION_IFSET(msk)      END_FTR_SECTION((msk), (msk))
  70 #define END_FTR_SECTION_IFCLR(msk)      END_FTR_SECTION((msk), 0)
  71
  72 /* CPU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
  73 #define FTR_SECTION_ELSE        FTR_SECTION_ELSE_NESTED(97)
  74 #define ALT_FTR_SECTION_END_NESTED(msk, val, label)     \
  75         MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
  76 #define ALT_FTR_SECTION_END_NESTED_IFSET(msk, label)    \
  77         ALT_FTR_SECTION_END_NESTED(msk, msk, label)
  78 #define ALT_FTR_SECTION_END_NESTED_IFCLR(msk, label)    \
  79         ALT_FTR_SECTION_END_NESTED(msk, 0, label)
  80 #define ALT_FTR_SECTION_END(msk, val)   \
  81         ALT_FTR_SECTION_END_NESTED(msk, val, 97)
  82 #define ALT_FTR_SECTION_END_IFSET(msk)  \
  83         ALT_FTR_SECTION_END_NESTED_IFSET(msk, 97)
  84 #define ALT_FTR_SECTION_END_IFCLR(msk)  \
  85         ALT_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
  86
  87 /* MMU feature dependent sections */
  88 #define BEGIN_MMU_FTR_SECTION_NESTED(label)     START_FTR_SECTION(label)
  89 #define BEGIN_MMU_FTR_SECTION                   START_FTR_SECTION(97)
  90
  91 #define END_MMU_FTR_SECTION_NESTED(msk, val, label)             \
  92         FTR_SECTION_ELSE_NESTED(label)                          \
  93         MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
  94
  95 #define END_MMU_FTR_SECTION(msk, val)           \
  96         END_MMU_FTR_SECTION_NESTED(msk, val, 97)
  97
  98 #define END_MMU_FTR_SECTION_IFSET(msk)  END_MMU_FTR_SECTION((msk), (msk))
  99 #define END_MMU_FTR_SECTION_IFCLR(msk)  END_MMU_FTR_SECTION((msk), 0)
 100
 101 /* MMU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
 102 #define MMU_FTR_SECTION_ELSE_NESTED(label)      FTR_SECTION_ELSE_NESTED(label)
 103 #define MMU_FTR_SECTION_ELSE    MMU_FTR_SECTION_ELSE_NESTED(97)
 104 #define ALT_MMU_FTR_SECTION_END_NESTED(msk, val, label) \
 105         MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
 106 #define ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, label)        \
 107         ALT_MMU_FTR_SECTION_END_NESTED(msk, msk, label)
 108 #define ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, label)        \
 109         ALT_MMU_FTR_SECTION_END_NESTED(msk, 0, label)
 110 #define ALT_MMU_FTR_SECTION_END(msk, val)       \
 111         ALT_MMU_FTR_SECTION_END_NESTED(msk, val, 97)
 112 #define ALT_MMU_FTR_SECTION_END_IFSET(msk)      \
 113         ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, 97)
 114 #define ALT_MMU_FTR_SECTION_END_IFCLR(msk)      \
 115         ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
 116
 117 /* Firmware feature dependent sections */
 118 #define BEGIN_FW_FTR_SECTION_NESTED(label)      START_FTR_SECTION(label)
 119 #define BEGIN_FW_FTR_SECTION                    START_FTR_SECTION(97)
 120
 121 #define END_FW_FTR_SECTION_NESTED(msk, val, label)              \
 122         FTR_SECTION_ELSE_NESTED(label)                          \
 123         MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
 124
 125 #define END_FW_FTR_SECTION(msk, val)            \
 126         END_FW_FTR_SECTION_NESTED(msk, val, 97)
 127
 128 #define END_FW_FTR_SECTION_IFSET(msk)   END_FW_FTR_SECTION((msk), (msk))
 129 #define END_FW_FTR_SECTION_IFCLR(msk)   END_FW_FTR_SECTION((msk), 0)
 130
 131 /* Firmware feature sections with alternatives */
 132 #define FW_FTR_SECTION_ELSE_NESTED(label)       FTR_SECTION_ELSE_NESTED(label)
 133 #define FW_FTR_SECTION_ELSE     FTR_SECTION_ELSE_NESTED(97)
 134 #define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label)  \
 135         MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
 136 #define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label) \
 137         ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label)
 138 #define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label) \
 139         ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label)
 140 #define ALT_FW_FTR_SECTION_END(msk, val)        \
 141         ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97)
 142 #define ALT_FW_FTR_SECTION_END_IFSET(msk)       \
 143         ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97)
 144 #define ALT_FW_FTR_SECTION_END_IFCLR(msk)       \
 145         ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
 146
 147 #ifndef __ASSEMBLY__
 148
 149 #define ASM_FTR_IF(section_if, section_else, msk, val)  \
 150         stringify_in_c(BEGIN_FTR_SECTION)                       \
 151         section_if "; "                                         \
 152         stringify_in_c(FTR_SECTION_ELSE)                        \
 153         section_else "; "                                       \
 154         stringify_in_c(ALT_FTR_SECTION_END((msk), (val)))
 155
 156 #define ASM_FTR_IFSET(section_if, section_else, msk)    \
 157         ASM_FTR_IF(section_if, section_else, (msk), (msk))
 158
 159 #define ASM_FTR_IFCLR(section_if, section_else, msk)    \
 160         ASM_FTR_IF(section_if, section_else, (msk), 0)
 161
 162 #define ASM_MMU_FTR_IF(section_if, section_else, msk, val)      \
 163         stringify_in_c(BEGIN_MMU_FTR_SECTION)                   \
 164         section_if "; "                                         \
 165         stringify_in_c(MMU_FTR_SECTION_ELSE)                    \
 166         section_else "; "                                       \
 167         stringify_in_c(ALT_MMU_FTR_SECTION_END((msk), (val)))
 168
 169 #define ASM_MMU_FTR_IFSET(section_if, section_else, msk)        \
 170         ASM_MMU_FTR_IF(section_if, section_else, (msk), (msk))
 171
 172 #define ASM_MMU_FTR_IFCLR(section_if, section_else, msk)        \
 173         ASM_MMU_FTR_IF(section_if, section_else, (msk), 0)
 174
 175 #endif /* __ASSEMBLY__ */
 176
 177 /* LWSYNC feature sections */
 178 #define START_LWSYNC_SECTION(label)     label##1:
 179 #define MAKE_LWSYNC_SECTION_ENTRY(label, sect)          \
 180 label##2:                                               \
 181         .pushsection sect,"a";                          \
 182         .align 2;                                       \
 183 label##3:                                               \
 184         FTR_ENTRY_OFFSET label##1b-label##3b;           \
 185         .popsection;
 186
 187 #ifndef __ASSEMBLY__
 188 void apply_feature_fixups(void);
 189 void setup_feature_keys(void);
 190 #endif
 191
 192 #endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */