microblaze: convert all simple headers to use asm-generic
[linux-2.6.git] / 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
16 #include <asm-generic/cmpxchg.h>
17 #include <asm-generic/cmpxchg-local.h>
18
19 struct task_struct;
20 struct thread_info;
21
22 extern struct task_struct *_switch_to(struct thread_info *prev,
23                                         struct thread_info *next);
24
25 #define switch_to(prev, next, last)                                     \
26         do {                                                            \
27                 (last) = _switch_to(task_thread_info(prev),             \
28                                         task_thread_info(next));        \
29         } while (0)
30
31 #define smp_read_barrier_depends()      do {} while (0)
32 #define read_barrier_depends()          do {} while (0)
33
34 #define nop()                   asm volatile ("nop")
35 #define mb()                    barrier()
36 #define rmb()                   mb()
37 #define wmb()                   mb()
38 #define set_mb(var, value)      do { var = value; mb(); } while (0)
39 #define set_wmb(var, value)     do { var = value; wmb(); } while (0)
40
41 #define smp_mb()                mb()
42 #define smp_rmb()               rmb()
43 #define smp_wmb()               wmb()
44
45 void show_trace(struct task_struct *task, unsigned long *stack);
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 #ifdef CONFIG_DEBUG_FS
89 extern struct dentry *of_debugfs_root;
90 #endif
91
92 #define arch_align_stack(x) (x)
93
94 #endif /* _ASM_MICROBLAZE_SYSTEM_H */