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system.h

/*
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * 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.
 */

#ifndef _ASM_MICROBLAZE_SYSTEM_H
#define _ASM_MICROBLAZE_SYSTEM_H

#include <asm/registers.h>
#include <asm/setup.h>
#include <asm/irqflags.h>

#include <asm-generic/cmpxchg.h>
#include <asm-generic/cmpxchg-local.h>

struct task_struct;
struct thread_info;

extern struct task_struct *_switch_to(struct thread_info *prev,
                              struct thread_info *next);

#define switch_to(prev, next, last)                         \
      do {                                            \
            (last) = _switch_to(task_thread_info(prev),           \
                              task_thread_info(next));      \
      } while (0)

#define smp_read_barrier_depends()  do {} while (0)
#define read_barrier_depends()            do {} while (0)

#define nop()                 asm volatile ("nop")
#define mb()                  barrier()
#define rmb()                 mb()
#define wmb()                 mb()
#define set_mb(var, value)    do { var = value; mb(); } while (0)
#define set_wmb(var, value)   do { var = value; wmb(); } while (0)

#define smp_mb()        mb()
#define smp_rmb()       rmb()
#define smp_wmb()       wmb()

void show_trace(struct task_struct *task, unsigned long *stack);
void __bad_xchg(volatile void *ptr, int size);

static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
                                                int size)
{
      unsigned long ret;
      unsigned long flags;

      switch (size) {
      case 1:
            local_irq_save(flags);
            ret = *(volatile unsigned char *)ptr;
            *(volatile unsigned char *)ptr = x;
            local_irq_restore(flags);
            break;

      case 4:
            local_irq_save(flags);
            ret = *(volatile unsigned long *)ptr;
            *(volatile unsigned long *)ptr = x;
            local_irq_restore(flags);
            break;
      default:
            __bad_xchg(ptr, size), ret = 0;
            break;
      }

      return ret;
}

void disable_hlt(void);
void enable_hlt(void);
void default_idle(void);

#define xchg(ptr, x) \
      ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))

void free_init_pages(char *what, unsigned long begin, unsigned long end);
void free_initmem(void);
extern char *klimit;
extern void ret_from_fork(void);

#ifdef CONFIG_DEBUG_FS
extern struct dentry *of_debugfs_root;
#endif

#define arch_align_stack(x) (x)

#endif /* _ASM_MICROBLAZE_SYSTEM_H */

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