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feature-fixups.h

#ifndef __ASM_POWERPC_FEATURE_FIXUPS_H
#define __ASM_POWERPC_FEATURE_FIXUPS_H

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifdef __ASSEMBLY__

/*
 * Feature section common macros
 *
 * Note that the entries now contain offsets between the table entry
 * and the code rather than absolute code pointers in order to be
 * useable with the vdso shared library. There is also an assumption
 * that values will be negative, that is, the fixup table has to be
 * located after the code it fixes up.
 */
#if defined(CONFIG_PPC64) && !defined(__powerpc64__)
/* 64 bits kernel, 32 bits code (ie. vdso32) */
#define FTR_ENTRY_LONG        .llong
#define FTR_ENTRY_OFFSET      .long 0xffffffff; .long
#else
/* 64 bit kernel 64 bit code, or 32 bit kernel 32 bit code */
#define FTR_ENTRY_LONG        PPC_LONG
#define FTR_ENTRY_OFFSET      PPC_LONG
#endif

#define START_FTR_SECTION(label)    label##1:

#define FTR_SECTION_ELSE_NESTED(label)                \
label##2:                                 \
      .pushsection __ftr_alt_##label,"a";       \
      .align 2;                           \
label##3:

#define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect) \
label##4:                                 \
      .popsection;                              \
      .pushsection sect,"a";                    \
      .align 3;                           \
label##5:                                       \
      FTR_ENTRY_LONG msk;                       \
      FTR_ENTRY_LONG val;                       \
      FTR_ENTRY_OFFSET label##1b-label##5b;           \
      FTR_ENTRY_OFFSET label##2b-label##5b;           \
      FTR_ENTRY_OFFSET label##3b-label##5b;           \
      FTR_ENTRY_OFFSET label##4b-label##5b;           \
      .popsection;


/* CPU feature dependent sections */
#define BEGIN_FTR_SECTION_NESTED(label)   START_FTR_SECTION(label)
#define BEGIN_FTR_SECTION           START_FTR_SECTION(97)

#define END_FTR_SECTION_NESTED(msk, val, label)             \
      FTR_SECTION_ELSE_NESTED(label)                        \
      MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)

#define END_FTR_SECTION(msk, val)         \
      END_FTR_SECTION_NESTED(msk, val, 97)

#define END_FTR_SECTION_IFSET(msk)  END_FTR_SECTION((msk), (msk))
#define END_FTR_SECTION_IFCLR(msk)  END_FTR_SECTION((msk), 0)

/* CPU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
#define FTR_SECTION_ELSE      FTR_SECTION_ELSE_NESTED(97)
#define ALT_FTR_SECTION_END_NESTED(msk, val, label)   \
      MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
#define ALT_FTR_SECTION_END_NESTED_IFSET(msk, label)  \
      ALT_FTR_SECTION_END_NESTED(msk, msk, label)
#define ALT_FTR_SECTION_END_NESTED_IFCLR(msk, label)  \
      ALT_FTR_SECTION_END_NESTED(msk, 0, label)
#define ALT_FTR_SECTION_END(msk, val)     \
      ALT_FTR_SECTION_END_NESTED(msk, val, 97)
#define ALT_FTR_SECTION_END_IFSET(msk)    \
      ALT_FTR_SECTION_END_NESTED_IFSET(msk, 97)
#define ALT_FTR_SECTION_END_IFCLR(msk)    \
      ALT_FTR_SECTION_END_NESTED_IFCLR(msk, 97)

/* Firmware feature dependent sections */
#define BEGIN_FW_FTR_SECTION_NESTED(label)      START_FTR_SECTION(label)
#define BEGIN_FW_FTR_SECTION              START_FTR_SECTION(97)

#define END_FW_FTR_SECTION_NESTED(msk, val, label)          \
      FTR_SECTION_ELSE_NESTED(label)                        \
      MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)

#define END_FW_FTR_SECTION(msk, val)            \
      END_FW_FTR_SECTION_NESTED(msk, val, 97)

#define END_FW_FTR_SECTION_IFSET(msk)     END_FW_FTR_SECTION((msk), (msk))
#define END_FW_FTR_SECTION_IFCLR(msk)     END_FW_FTR_SECTION((msk), 0)

/* Firmware feature sections with alternatives */
#define FW_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label)
#define FW_FTR_SECTION_ELSE   FTR_SECTION_ELSE_NESTED(97)
#define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label)      \
      MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
#define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label)     \
      ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label)
#define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label)     \
      ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label)
#define ALT_FW_FTR_SECTION_END(msk, val)  \
      ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97)
#define ALT_FW_FTR_SECTION_END_IFSET(msk) \
      ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97)
#define ALT_FW_FTR_SECTION_END_IFCLR(msk) \
      ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97)

#endif /* __ASSEMBLY__ */

/* LWSYNC feature sections */
#define START_LWSYNC_SECTION(label) label##1:
#define MAKE_LWSYNC_SECTION_ENTRY(label, sect)        \
label##2:                                 \
      .pushsection sect,"a";                    \
      .align 2;                           \
label##3:                                       \
      .long label##1b-label##3b;                \
      .popsection;

#endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */

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