114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/*
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* include/asm-v850/system.h -- Low-level interrupt/thread ops
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*
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* Copyright (C) 2001,02,03 NEC Electronics Corporation
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* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* Written by Miles Bader <miles@gnu.org>
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*/
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#ifndef __V850_SYSTEM_H__
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#define __V850_SYSTEM_H__
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#include <linux/linkage.h>
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#include <asm/ptrace.h>
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#define prepare_to_switch() do { } while (0)
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/*
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* switch_to(n) should switch tasks to task ptr, first checking that
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* ptr isn't the current task, in which case it does nothing.
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*/
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struct thread_struct;
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extern void *switch_thread (struct thread_struct *last,
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struct thread_struct *next);
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#define switch_to(prev,next,last) \
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do { \
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if (prev != next) { \
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(last) = switch_thread (&prev->thread, &next->thread); \
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} \
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} while (0)
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/* Enable/disable interrupts. */
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#define local_irq_enable() __asm__ __volatile__ ("ei")
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#define local_irq_disable() __asm__ __volatile__ ("di")
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#define local_save_flags(flags) \
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__asm__ __volatile__ ("stsr %1, %0" : "=r" (flags) : "i" (SR_PSW))
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#define local_restore_flags(flags) \
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__asm__ __volatile__ ("ldsr %0, %1" :: "r" (flags), "i" (SR_PSW))
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/* For spinlocks etc */
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#define local_irq_save(flags) \
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do { local_save_flags (flags); local_irq_disable (); } while (0)
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#define local_irq_restore(flags) \
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local_restore_flags (flags);
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static inline int irqs_disabled (void)
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{
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unsigned flags;
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local_save_flags (flags);
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return !!(flags & 0x20);
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}
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/*
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* Force strict CPU ordering.
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* Not really required on v850...
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*/
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#define nop() __asm__ __volatile__ ("nop")
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#define mb() __asm__ __volatile__ ("" ::: "memory")
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#define rmb() mb ()
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#define wmb() mb ()
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#define read_barrier_depends() ((void)0)
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#define set_rmb(var, value) do { xchg (&var, value); } while (0)
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#define set_mb(var, value) set_rmb (var, value)
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#define set_wmb(var, value) do { var = value; wmb (); } while (0)
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#define smp_mb() mb ()
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#define smp_rmb() rmb ()
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#define smp_wmb() wmb ()
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#define smp_read_barrier_depends() read_barrier_depends()
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#define xchg(ptr, with) \
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((__typeof__ (*(ptr)))__xchg ((unsigned long)(with), (ptr), sizeof (*(ptr))))
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#define tas(ptr) (xchg ((ptr), 1))
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extern inline unsigned long __xchg (unsigned long with,
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__volatile__ void *ptr, int size)
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{
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unsigned long tmp, flags;
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local_irq_save (flags);
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switch (size) {
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case 1:
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tmp = *(unsigned char *)ptr;
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*(unsigned char *)ptr = with;
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break;
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case 2:
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tmp = *(unsigned short *)ptr;
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*(unsigned short *)ptr = with;
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break;
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case 4:
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tmp = *(unsigned long *)ptr;
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*(unsigned long *)ptr = with;
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break;
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}
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local_irq_restore (flags);
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return tmp;
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}
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#define arch_align_stack(x) (x)
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#endif /* __V850_SYSTEM_H__ */
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