arch/microblaze/include/asm/system.h

   1 /*
   2  * Copyright (C) 2006 Atmark Techno, Inc.
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License. See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  */
   8
   9 #ifndef _ASM_MICROBLAZE_SYSTEM_H
  10 #define _ASM_MICROBLAZE_SYSTEM_H
  11
  12 #include <asm/registers.h>
  13 #include <asm/setup.h>
  14 #include <asm/irqflags.h>
  15 #include <asm/cache.h>
  16
  17 #include <asm-generic/cmpxchg.h>
  18 #include <asm-generic/cmpxchg-local.h>
  19
  20 struct task_struct;
  21 struct thread_info;
  22
  23 extern struct task_struct *_switch_to(struct thread_info *prev,
  24                                         struct thread_info *next);
  25
  26 #define switch_to(prev, next, last)                                     \
  27         do {                                                            \
  28                 (last) = _switch_to(task_thread_info(prev),             \
  29                                         task_thread_info(next));        \
  30         } while (0)
  31
  32 #define smp_read_barrier_depends()      do {} while (0)
  33 #define read_barrier_depends()          do {} while (0)
  34
  35 #define nop()                   asm volatile ("nop")
  36 #define mb()                    barrier()
  37 #define rmb()                   mb()
  38 #define wmb()                   mb()
  39 #define set_mb(var, value)      do { var = value; mb(); } while (0)
  40 #define set_wmb(var, value)     do { var = value; wmb(); } while (0)
  41
  42 #define smp_mb()                mb()
  43 #define smp_rmb()               rmb()
  44 #define smp_wmb()               wmb()
  45
  46 void __bad_xchg(volatile void *ptr, int size);
  47
  48 static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
  49                                                                 int size)
  50 {
  51         unsigned long ret;
  52         unsigned long flags;
  53
  54         switch (size) {
  55         case 1:
  56                 local_irq_save(flags);
  57                 ret = *(volatile unsigned char *)ptr;
  58                 *(volatile unsigned char *)ptr = x;
  59                 local_irq_restore(flags);
  60                 break;
  61
  62         case 4:
  63                 local_irq_save(flags);
  64                 ret = *(volatile unsigned long *)ptr;
  65                 *(volatile unsigned long *)ptr = x;
  66                 local_irq_restore(flags);
  67                 break;
  68         default:
  69                 __bad_xchg(ptr, size), ret = 0;
  70                 break;
  71         }
  72
  73         return ret;
  74 }
  75
  76 void disable_hlt(void);
  77 void enable_hlt(void);
  78 void default_idle(void);
  79
  80 #define xchg(ptr, x) \
  81         ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
  82
  83 void free_init_pages(char *what, unsigned long begin, unsigned long end);
  84 void free_initmem(void);
  85 extern char *klimit;
  86 extern void ret_from_fork(void);
  87
  88 extern void *alloc_maybe_bootmem(size_t size, gfp_t mask);
  89 extern void *zalloc_maybe_bootmem(size_t size, gfp_t mask);
  90
  91 #ifdef CONFIG_DEBUG_FS
  92 extern struct dentry *of_debugfs_root;
  93 #endif
  94
  95 #define arch_align_stack(x) (x)
  96
  97 #endif /* _ASM_MICROBLAZE_SYSTEM_H */