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 #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 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 /* Firmware feature dependent sections */
  85 #define BEGIN_FW_FTR_SECTION_NESTED(label)      START_FTR_SECTION(label)
  86 #define BEGIN_FW_FTR_SECTION                    START_FTR_SECTION(97)
  87
  88 #define END_FW_FTR_SECTION_NESTED(msk, val, label)              \
  89         FTR_SECTION_ELSE_NESTED(label)                          \
  90         MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
  91
  92 #define END_FW_FTR_SECTION(msk, val)            \
  93         END_FW_FTR_SECTION_NESTED(msk, val, 97)
  94
  95 #define END_FW_FTR_SECTION_IFSET(msk)   END_FW_FTR_SECTION((msk), (msk))
  96 #define END_FW_FTR_SECTION_IFCLR(msk)   END_FW_FTR_SECTION((msk), 0)
  97
  98 /* Firmware feature sections with alternatives */
  99 #define FW_FTR_SECTION_ELSE_NESTED(label)       FTR_SECTION_ELSE_NESTED(label)
 100 #define FW_FTR_SECTION_ELSE     FTR_SECTION_ELSE_NESTED(97)
 101 #define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label)  \
 102         MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
 103 #define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label) \
 104         ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label)
 105 #define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label) \
 106         ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label)
 107 #define ALT_FW_FTR_SECTION_END(msk, val)        \
 108         ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97)
 109 #define ALT_FW_FTR_SECTION_END_IFSET(msk)       \
 110         ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97)
 111 #define ALT_FW_FTR_SECTION_END_IFCLR(msk)       \
 112         ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
 113
 114 #endif /* __ASSEMBLY__ */
 115
 116 /* LWSYNC feature sections */
 117 #define START_LWSYNC_SECTION(label)     label##1:
 118 #define MAKE_LWSYNC_SECTION_ENTRY(label, sect)          \
 119 label##2:                                               \
 120         .pushsection sect,"a";                          \
 121         .align 2;                                       \
 122 label##3:                                               \
 123         .long label##1b-label##3b;                      \
 124         .popsection;
 125
 126 #endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */