162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/*
|
|
* include/asm-microblaze/system.h -- Low-level interrupt/thread ops
|
|
*
|
|
* Copyright (C) 2003 John Williams (jwilliams@itee.uq.edu.au)
|
|
* based upon microblaze version
|
|
* Copyright (C) 2001 NEC Corporation
|
|
* Copyright (C) 2001 Miles Bader <miles@gnu.org>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file COPYING in the main directory of this
|
|
* archive for more details.
|
|
*
|
|
* Written by Miles Bader <miles@gnu.org>
|
|
* Microblaze port by John Williams
|
|
* Microblaze port by John Williams
|
|
*/
|
|
|
|
#ifndef __MICROBLAZE_SYSTEM_H__
|
|
#define __MICROBLAZE_SYSTEM_H__
|
|
|
|
#if 0
|
|
#include <linux/linkage.h>
|
|
#endif
|
|
#include <asm/ptrace.h>
|
|
|
|
#define prepare_to_switch() do { } while (0)
|
|
|
|
/*
|
|
* switch_to(n) should switch tasks to task ptr, first checking that
|
|
* ptr isn't the current task, in which case it does nothing.
|
|
*/
|
|
struct thread_struct;
|
|
extern void *switch_thread (struct thread_struct *last,
|
|
struct thread_struct *next);
|
|
#define switch_to(prev,next,last) do { \
|
|
if (prev != next) { \
|
|
(last) = switch_thread (&prev->thread, &next->thread); \
|
|
} \
|
|
} while (0)
|
|
|
|
|
|
/* Enable/disable interrupts. */
|
|
#define __sti() \
|
|
{ \
|
|
register unsigned tmp; \
|
|
__asm__ __volatile__ (" \
|
|
mfs %0, rmsr; \
|
|
ori %0, %0, 2; \
|
|
mts rmsr, %0" \
|
|
: "=r" (tmp) \
|
|
: \
|
|
: "memory"); \
|
|
}
|
|
|
|
#define __cli() \
|
|
{ \
|
|
register unsigned tmp; \
|
|
__asm__ __volatile__ (" \
|
|
mfs %0, rmsr; \
|
|
andi %0, %0, ~2; \
|
|
mts rmsr, %0" \
|
|
: "=r" (tmp) \
|
|
: \
|
|
: "memory"); \
|
|
}
|
|
|
|
#define __save_flags(flags) \
|
|
__asm__ __volatile__ ("mfs %0, rmsr" : "=r" (flags))
|
|
#define __restore_flags(flags) \
|
|
__asm__ __volatile__ ("mts rmsr, %0" :: "r" (flags))
|
|
|
|
#define __save_flags_cli(flags) \
|
|
{ \
|
|
register unsigned tmp; \
|
|
__asm__ __volatile__ (" \
|
|
mfs %0, rmsr; \
|
|
andi %1, %0, ~2; \
|
|
mts rmsr, %1;" \
|
|
: "=r" (flags), "=r" (tmp) \
|
|
: \
|
|
: "memory"); \
|
|
}
|
|
|
|
#define __save_flags_sti(flags) \
|
|
{ \
|
|
register unsigned tmp; \
|
|
__asm__ __volatile__ (" \
|
|
mfs %0, rmsr; \
|
|
ori %1, %0, 2; \
|
|
mts rmsr, %1;" \
|
|
: "=r" (flags) ,"=r" (tmp) \
|
|
: \
|
|
: "memory"); \
|
|
}
|
|
|
|
/* For spinlocks etc */
|
|
#define local_irq_save(flags) __save_flags_cli (flags)
|
|
#define local_irq_set(flags) __save_flags_sti (flags)
|
|
#define local_irq_restore(flags) __restore_flags (flags)
|
|
#define local_irq_disable() __cli ()
|
|
#define local_irq_enable() __sti ()
|
|
|
|
#define cli() __cli ()
|
|
#define sti() __sti ()
|
|
#define save_flags(flags) __save_flags (flags)
|
|
#define restore_flags(flags) __restore_flags (flags)
|
|
#define save_flags_cli(flags) __save_flags_cli (flags)
|
|
|
|
/*
|
|
* Force strict CPU ordering.
|
|
* Not really required on microblaze...
|
|
*/
|
|
#define nop() __asm__ __volatile__ ("nop")
|
|
#define mb() __asm__ __volatile__ ("nop" ::: "memory")
|
|
#define rmb() mb ()
|
|
#define wmb() mb ()
|
|
#define set_mb(var, value) do { var = value; mb(); } while (0)
|
|
#define set_wmb(var, value) do { var = value; wmb (); } while (0)
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define smp_mb() mb ()
|
|
#define smp_rmb() rmb ()
|
|
#define smp_wmb() wmb ()
|
|
#else
|
|
#define smp_mb() barrier ()
|
|
#define smp_rmb() barrier ()
|
|
#define smp_wmb() barrier ()
|
|
#endif
|
|
|
|
#define xchg(ptr, with) \
|
|
((__typeof__ (*(ptr)))__xchg ((unsigned long)(with), (ptr), sizeof (*(ptr))))
|
|
#define tas(ptr) (xchg ((ptr), 1))
|
|
|
|
extern inline unsigned long __xchg (unsigned long with,
|
|
__volatile__ void *ptr, int size)
|
|
{
|
|
unsigned long tmp, flags;
|
|
|
|
save_flags_cli (flags);
|
|
|
|
switch (size) {
|
|
case 1:
|
|
tmp = *(unsigned char *)ptr;
|
|
*(unsigned char *)ptr = with;
|
|
break;
|
|
case 2:
|
|
tmp = *(unsigned short *)ptr;
|
|
*(unsigned short *)ptr = with;
|
|
break;
|
|
case 4:
|
|
tmp = *(unsigned long *)ptr;
|
|
*(unsigned long *)ptr = with;
|
|
break;
|
|
}
|
|
|
|
restore_flags (flags);
|
|
|
|
return tmp;
|
|
}
|
|
|
|
#endif /* __MICROBLAZE_SYSTEM_H__ */
|