jump_label.h

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 2010 Cavium Networks, Inc.
 */
#ifndef _ASM_MIPS_JUMP_LABEL_H
#define _ASM_MIPS_JUMP_LABEL_H

#include <linux/types.h>

#ifdef __KERNEL__

#define JUMP_LABEL_NOP_SIZE 4

#ifdef CONFIG_64BIT
#define WORD_INSN ".dword"
#else
#define WORD_INSN ".word"
#endif

static __always_inline bool arch_static_branch(struct static_key *key)
{
    asm goto("1:\tnop\n\t"
        "nop\n\t"
        ".pushsection __jump_table,  \"aw\"\n\t"
        WORD_INSN " 1b, %l[l_yes], %0\n\t"
        ".popsection\n\t"
        : :  "i" (key) : : l_yes);
    return false;
l_yes:
    return true;
}

#endif /* __KERNEL__ */

#ifdef CONFIG_64BIT
typedef u64 jump_label_t;
#else
typedef u32 jump_label_t;
#endif

struct jump_entry {
    jump_label_t code;
    jump_label_t target;
    jump_label_t key;
};

#endif /* _ASM_MIPS_JUMP_LABEL_H */