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#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)                  \
  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        .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#endif /* __ASSEMBLY__ */
 145
 146/* LWSYNC feature sections */
 147#define START_LWSYNC_SECTION(label)     label##1:
 148#define MAKE_LWSYNC_SECTION_ENTRY(label, sect)          \
 149label##2:                                               \
 150        .pushsection sect,"a";                          \
 151        .align 2;                                       \
 152label##3:                                               \
 153        .long label##1b-label##3b;                      \
 154        .popsection;
 155
 156#endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */
 157