/*
   * jump label x86 support
   *
   * Copyright (C) 2009 Jason Baron <jbaron@redhat.com>
   *
   */
  #include <linux/jump_label.h>
  #include <linux/memory.h>
  #include <linux/uaccess.h>
  #include <linux/module.h>
  #include <linux/list.h>
  #include <linux/jhash.h>
  #include <linux/cpu.h>
  #include <asm/kprobes.h>
  #include <asm/alternative.h>
  
  #ifdef HAVE_JUMP_LABEL
  
  union jump_code_union {
  	char code[JUMP_LABEL_NOP_SIZE];
  	struct {
  		char jump;
  		int offset;
  	} __attribute__((packed));
  };

  static void __jump_label_transform(struct jump_entry *entry,
  				   enum jump_label_type type,
  				   void *(*poker)(void *, const void *, size_t))

  {
  	union jump_code_union code;
  
  	if (type == JUMP_LABEL_ENABLE) {
  		code.jump = 0xe9;
  		code.offset = entry->target -
  				(entry->code + JUMP_LABEL_NOP_SIZE);
  	} else

  		memcpy(&code, ideal_nops[NOP_ATOMIC5], JUMP_LABEL_NOP_SIZE);

  
  	(*poker)((void *)entry->code, &code, JUMP_LABEL_NOP_SIZE);
  }
  
  void arch_jump_label_transform(struct jump_entry *entry,
  			       enum jump_label_type type)
  {

  	get_online_cpus();
  	mutex_lock(&text_mutex);

  	__jump_label_transform(entry, type, text_poke_smp);

  	mutex_unlock(&text_mutex);
  	put_online_cpus();
  }

  __init_or_module void arch_jump_label_transform_static(struct jump_entry *entry,

  				      enum jump_label_type type)
  {
  	__jump_label_transform(entry, type, text_poke_early);
  }

  #endif