LXR linux/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)                  \
  35label##2:                                               \
  36        .pushsection __ftr_alt_##label,"a";             \
  37        .align 2;                                       \
  38label##3:
  39
  40#define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect)           \
  41label##4:                                                       \
  42        .popsection;                                            \
  43        .pushsection sect,"a";                                  \
  44        .align 3;                                               \
  45label##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)          \
 180label##2:                                               \
 181        .pushsection sect,"a";                          \
 182        .align 2;                                       \
 183label##3:                                               \
 184        FTR_ENTRY_OFFSET label##1b-label##3b;           \
 185        .popsection;
 186
 187#ifndef __ASSEMBLY__
 188void apply_feature_fixups(void);
 189void setup_feature_keys(void);
 190#endif
 191
 192#endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */
 193