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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1#ifndef __ASM_CRIS_SYSTEM_H
2#define __ASM_CRIS_SYSTEM_H
3
4#include <asm/arch/system.h>
5
6/* the switch_to macro calls resume, an asm function in entry.S which does the actual
7 * task switching.
8 */
9
10extern struct task_struct *resume(struct task_struct *prev, struct task_struct *next, int);
11#define switch_to(prev,next,last) last = resume(prev,next, \
12 (int)&((struct task_struct *)0)->thread)
13
14#define barrier() __asm__ __volatile__("": : :"memory")
15#define mb() barrier()
16#define rmb() mb()
17#define wmb() mb()
18#define read_barrier_depends() do { } while(0)
19#define set_mb(var, value) do { var = value; mb(); } while (0)
20#define set_wmb(var, value) do { var = value; wmb(); } while (0)
21
22#ifdef CONFIG_SMP
23#define smp_mb() mb()
24#define smp_rmb() rmb()
25#define smp_wmb() wmb()
26#define smp_read_barrier_depends() read_barrier_depends()
27#else
28#define smp_mb() barrier()
29#define smp_rmb() barrier()
30#define smp_wmb() barrier()
31#define smp_read_barrier_depends() do { } while(0)
32#endif
33
34#define iret()
35
36/*
37 * disable hlt during certain critical i/o operations
38 */
39#define HAVE_DISABLE_HLT
40void disable_hlt(void);
41void enable_hlt(void);
42
43static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
44{
45 /* since Etrax doesn't have any atomic xchg instructions, we need to disable
46 irq's (if enabled) and do it with move.d's */
47 unsigned long flags,temp;
48 local_save_flags(flags); /* save flags, including irq enable bit */
49 local_irq_disable(); /* shut off irq's */
50 switch (size) {
51 case 1:
52 *((unsigned char *)&temp) = x;
53 x = *(unsigned char *)ptr;
54 *(unsigned char *)ptr = *((unsigned char *)&temp);
55 break;
56 case 2:
57 *((unsigned short *)&temp) = x;
58 x = *(unsigned short *)ptr;
59 *(unsigned short *)ptr = *((unsigned short *)&temp);
60 break;
61 case 4:
62 temp = x;
63 x = *(unsigned long *)ptr;
64 *(unsigned long *)ptr = temp;
65 break;
66 }
67 local_irq_restore(flags); /* restore irq enable bit */
68 return x;
69}
70
71#define arch_align_stack(x) (x)
72
73void default_idle(void);
74
75#endif