projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * include/asm-v850/system.h -- Low-level interrupt/thread ops | |
| 3 | * | |
| 4 | * Copyright (C) 2001,02,03 NEC Electronics Corporation | |
| 5 | * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> | |
| 6 | * | |
| 7 | * This file is subject to the terms and conditions of the GNU General | |
| 8 | * Public License. See the file COPYING in the main directory of this | |
| 9 | * archive for more details. | |
| 10 | * | |
| 11 | * Written by Miles Bader <miles@gnu.org> | |
| 12 | */ | |
| 13 | ||
| 14 | #ifndef __V850_SYSTEM_H__ | |
| 15 | #define __V850_SYSTEM_H__ | |
| 16 | ||
| 17 | #include <linux/linkage.h> | |
| 18 | #include <asm/ptrace.h> | |
| 19 | ||
| 20 | ||
| 1da177e4 LT |
21 | /* |
| 22 | * switch_to(n) should switch tasks to task ptr, first checking that | |
| 23 | * ptr isn't the current task, in which case it does nothing. | |
| 24 | */ | |
| 25 | struct thread_struct; | |
| 26 | extern void *switch_thread (struct thread_struct *last, | |
| 27 | struct thread_struct *next); | |
| 28 | #define switch_to(prev,next,last) \ | |
| 29 | do { \ | |
| 30 | if (prev != next) { \ | |
| 31 | (last) = switch_thread (&prev->thread, &next->thread); \ | |
| 32 | } \ | |
| 33 | } while (0) | |
| 34 | ||
| 35 | ||
| 36 | /* Enable/disable interrupts. */ | |
| 37 | #define local_irq_enable() __asm__ __volatile__ ("ei") | |
| 38 | #define local_irq_disable() __asm__ __volatile__ ("di") | |
| 39 | ||
| 40 | #define local_save_flags(flags) \ | |
| 41 | __asm__ __volatile__ ("stsr %1, %0" : "=r" (flags) : "i" (SR_PSW)) | |
| 42 | #define local_restore_flags(flags) \ | |
| 43 | __asm__ __volatile__ ("ldsr %0, %1" :: "r" (flags), "i" (SR_PSW)) | |
| 44 | ||
| 45 | /* For spinlocks etc */ | |
| 46 | #define local_irq_save(flags) \ | |
| 47 | do { local_save_flags (flags); local_irq_disable (); } while (0) | |
| 48 | #define local_irq_restore(flags) \ | |
| 49 | local_restore_flags (flags); | |
| 50 | ||
| 51 | ||
| 52 | static inline int irqs_disabled (void) | |
| 53 | { | |
| 54 | unsigned flags; | |
| 55 | local_save_flags (flags); | |
| 56 | return !!(flags & 0x20); | |
| 57 | } | |
| 58 | ||
| 59 | ||
| 60 | /* | |
| 61 | * Force strict CPU ordering. | |
| 62 | * Not really required on v850... | |
| 63 | */ | |
| 64 | #define nop() __asm__ __volatile__ ("nop") | |
| 65 | #define mb() __asm__ __volatile__ ("" ::: "memory") | |
| 66 | #define rmb() mb () | |
| 67 | #define wmb() mb () | |
| 68 | #define read_barrier_depends() ((void)0) | |
| 69 | #define set_rmb(var, value) do { xchg (&var, value); } while (0) | |
| 70 | #define set_mb(var, value) set_rmb (var, value) | |
| 1da177e4 LT |
71 | |
| 72 | #define smp_mb() mb () | |
| 73 | #define smp_rmb() rmb () | |
| 74 | #define smp_wmb() wmb () | |
| 75 | #define smp_read_barrier_depends() read_barrier_depends() | |
| 76 | ||
| 77 | #define xchg(ptr, with) \ | |
| 78 | ((__typeof__ (*(ptr)))__xchg ((unsigned long)(with), (ptr), sizeof (*(ptr)))) | |
| 1da177e4 | 79 | |
| 23f88fe4 | 80 | static inline unsigned long __xchg (unsigned long with, |
| 1da177e4 LT |
81 | __volatile__ void *ptr, int size) |
| 82 | { | |
| 83 | unsigned long tmp, flags; | |
| 84 | ||
| 85 | local_irq_save (flags); | |
| 86 | ||
| 87 | switch (size) { | |
| 88 | case 1: | |
| 89 | tmp = *(unsigned char *)ptr; | |
| 90 | *(unsigned char *)ptr = with; | |
| 91 | break; | |
| 92 | case 2: | |
| 93 | tmp = *(unsigned short *)ptr; | |
| 94 | *(unsigned short *)ptr = with; | |
| 95 | break; | |
| 96 | case 4: | |
| 97 | tmp = *(unsigned long *)ptr; | |
| 98 | *(unsigned long *)ptr = with; | |
| 99 | break; | |
| 100 | } | |
| 101 | ||
| 102 | local_irq_restore (flags); | |
| 103 | ||
| 104 | return tmp; | |
| 105 | } | |
| 106 | ||
| 107 | #define arch_align_stack(x) (x) | |
| 108 | ||
| 109 | #endif /* __V850_SYSTEM_H__ */ |