LXR linux/arch/avr32/include/asm/switch

   1/*
   2 * Copyright (C) 2004-2006 Atmel Corporation
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 */
   8#ifndef __ASM_AVR32_SWITCH_TO_H
   9#define __ASM_AVR32_SWITCH_TO_H
  10
  11/*
  12 * Help PathFinder and other Nexus-compliant debuggers keep track of
  13 * the current PID by emitting an Ownership Trace Message each time we
  14 * switch task.
  15 */
  16#ifdef CONFIG_OWNERSHIP_TRACE
  17#include <asm/ocd.h>
  18#define finish_arch_switch(prev)                        \
  19        do {                                            \
  20                ocd_write(PID, prev->pid);              \
  21                ocd_write(PID, current->pid);           \
  22        } while(0)
  23#endif
  24
  25/*
  26 * switch_to(prev, next, last) should switch from task `prev' to task
  27 * `next'. `prev' will never be the same as `next'.
  28 *
  29 * We just delegate everything to the __switch_to assembly function,
  30 * which is implemented in arch/avr32/kernel/switch_to.S
  31 *
  32 * mb() tells GCC not to cache `current' across this call.
  33 */
  34struct cpu_context;
  35struct task_struct;
  36extern struct task_struct *__switch_to(struct task_struct *,
  37                                       struct cpu_context *,
  38                                       struct cpu_context *);
  39#define switch_to(prev, next, last)                                     \
  40        do {                                                            \
  41                last = __switch_to(prev, &prev->thread.cpu_context + 1, \
  42                                   &next->thread.cpu_context);          \
  43        } while (0)
  44
  45
  46#endif /* __ASM_AVR32_SWITCH_TO_H */
  47