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Diffstat (limited to 'arch/microblaze/include/asm/system.h')
| -rw-r--r-- | arch/microblaze/include/asm/system.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/arch/microblaze/include/asm/system.h b/arch/microblaze/include/asm/system.h new file mode 100644 index 000000000..0297a1159 --- /dev/null +++ b/arch/microblaze/include/asm/system.h @@ -0,0 +1,161 @@ +/* + * 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__ */ |