feature-fixups.h

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#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.
 */

/*
 * 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
#elif defined(CONFIG_PPC64)
#define FTR_ENTRY_LONG      .llong
#define FTR_ENTRY_OFFSET    .llong
#else
#define FTR_ENTRY_LONG      .long
#define FTR_ENTRY_OFFSET    .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;           \
    .ifgt (label##4b- label##3b)-(label##2b- label##1b);    \
    .error "Feature section else case larger than body";    \
    .endif;                         \
    .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)

/* MMU feature dependent sections */
#define BEGIN_MMU_FTR_SECTION_NESTED(label) START_FTR_SECTION(label)
#define BEGIN_MMU_FTR_SECTION           START_FTR_SECTION(97)

#define END_MMU_FTR_SECTION_NESTED(msk, val, label)         \
    FTR_SECTION_ELSE_NESTED(label)              \
    MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)

#define END_MMU_FTR_SECTION(msk, val)       \
    END_MMU_FTR_SECTION_NESTED(msk, val, 97)

#define END_MMU_FTR_SECTION_IFSET(msk)  END_MMU_FTR_SECTION((msk), (msk))
#define END_MMU_FTR_SECTION_IFCLR(msk)  END_MMU_FTR_SECTION((msk), 0)

/* MMU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
#define MMU_FTR_SECTION_ELSE_NESTED(label)  FTR_SECTION_ELSE_NESTED(label)
#define MMU_FTR_SECTION_ELSE    MMU_FTR_SECTION_ELSE_NESTED(97)
#define ALT_MMU_FTR_SECTION_END_NESTED(msk, val, label) \
    MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
#define ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, label)    \
    ALT_MMU_FTR_SECTION_END_NESTED(msk, msk, label)
#define ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, label)    \
    ALT_MMU_FTR_SECTION_END_NESTED(msk, 0, label)
#define ALT_MMU_FTR_SECTION_END(msk, val)   \
    ALT_MMU_FTR_SECTION_END_NESTED(msk, val, 97)
#define ALT_MMU_FTR_SECTION_END_IFSET(msk)  \
    ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, 97)
#define ALT_MMU_FTR_SECTION_END_IFCLR(msk)  \
    ALT_MMU_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)

#ifndef __ASSEMBLY__

#define ASM_FTR_IF(section_if, section_else, msk, val)  \
    stringify_in_c(BEGIN_FTR_SECTION)           \
    section_if "; "                     \
    stringify_in_c(FTR_SECTION_ELSE)            \
    section_else "; "                   \
    stringify_in_c(ALT_FTR_SECTION_END((msk), (val)))

#define ASM_FTR_IFSET(section_if, section_else, msk)    \
    ASM_FTR_IF(section_if, section_else, (msk), (msk))

#define ASM_FTR_IFCLR(section_if, section_else, msk)    \
    ASM_FTR_IF(section_if, section_else, (msk), 0)

#define ASM_MMU_FTR_IF(section_if, section_else, msk, val)  \
    stringify_in_c(BEGIN_MMU_FTR_SECTION)           \
    section_if "; "                     \
    stringify_in_c(MMU_FTR_SECTION_ELSE)            \
    section_else "; "                   \
    stringify_in_c(ALT_MMU_FTR_SECTION_END((msk), (val)))

#define ASM_MMU_FTR_IFSET(section_if, section_else, msk)    \
    ASM_MMU_FTR_IF(section_if, section_else, (msk), (msk))

#define ASM_MMU_FTR_IFCLR(section_if, section_else, msk)    \
    ASM_MMU_FTR_IF(section_if, section_else, (msk), 0)

#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:                           \
    FTR_ENTRY_OFFSET label##1b-label##3b;       \
    .popsection;

#endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */