From 6b11879d819e27d96163f12b40277589bf54be22 Mon Sep 17 00:00:00 2001 From: "kfraser@localhost.localdomain" Date: Thu, 10 Aug 2006 10:43:20 +0100 Subject: [MINIOS] A first step to re-architecture mini-os for a port to ia64. Create architecture specific directories below mini-os for sources and below mini-os/include for headers. Signed-off-by: Dietmar Hahn --- extras/mini-os/include/spinlock.h | 121 -------------------------------------- 1 file changed, 121 deletions(-) delete mode 100644 extras/mini-os/include/spinlock.h (limited to 'extras/mini-os/include/spinlock.h') diff --git a/extras/mini-os/include/spinlock.h b/extras/mini-os/include/spinlock.h deleted file mode 100644 index 4274cd2869..0000000000 --- a/extras/mini-os/include/spinlock.h +++ /dev/null @@ -1,121 +0,0 @@ -#ifndef __ASM_SPINLOCK_H -#define __ASM_SPINLOCK_H - -#include - -/* - * Your basic SMP spinlocks, allowing only a single CPU anywhere - */ - -typedef struct { - volatile unsigned int slock; -} spinlock_t; - -#define SPINLOCK_MAGIC 0xdead4ead - -#define SPIN_LOCK_UNLOCKED (spinlock_t) { 1 } - -#define spin_lock_init(x) do { *(x) = SPIN_LOCK_UNLOCKED; } while(0) - -/* - * Simple spin lock operations. There are two variants, one clears IRQ's - * on the local processor, one does not. - * - * We make no fairness assumptions. They have a cost. - */ - -#define spin_is_locked(x) (*(volatile signed char *)(&(x)->slock) <= 0) -#define spin_unlock_wait(x) do { barrier(); } while(spin_is_locked(x)) - -#define spin_lock_string \ - "1:\n" \ - LOCK \ - "decb %0\n\t" \ - "jns 3f\n" \ - "2:\t" \ - "rep;nop\n\t" \ - "cmpb $0,%0\n\t" \ - "jle 2b\n\t" \ - "jmp 1b\n" \ - "3:\n\t" - -#define spin_lock_string_flags \ - "1:\n" \ - LOCK \ - "decb %0\n\t" \ - "jns 4f\n\t" \ - "2:\t" \ - "testl $0x200, %1\n\t" \ - "jz 3f\n\t" \ - "#sti\n\t" \ - "3:\t" \ - "rep;nop\n\t" \ - "cmpb $0, %0\n\t" \ - "jle 3b\n\t" \ - "#cli\n\t" \ - "jmp 1b\n" \ - "4:\n\t" - -/* - * This works. Despite all the confusion. - * (except on PPro SMP or if we are using OOSTORE) - * (PPro errata 66, 92) - */ - -#define spin_unlock_string \ - "xchgb %b0, %1" \ - :"=q" (oldval), "=m" (lock->slock) \ - :"0" (oldval) : "memory" - -static inline void _raw_spin_unlock(spinlock_t *lock) -{ - char oldval = 1; - __asm__ __volatile__( - spin_unlock_string - ); -} - -static inline int _raw_spin_trylock(spinlock_t *lock) -{ - char oldval; - __asm__ __volatile__( - "xchgb %b0,%1\n" - :"=q" (oldval), "=m" (lock->slock) - :"0" (0) : "memory"); - return oldval > 0; -} - -static inline void _raw_spin_lock(spinlock_t *lock) -{ - __asm__ __volatile__( - spin_lock_string - :"=m" (lock->slock) : : "memory"); -} - -static inline void _raw_spin_lock_flags (spinlock_t *lock, unsigned long flags) -{ - __asm__ __volatile__( - spin_lock_string_flags - :"=m" (lock->slock) : "r" (flags) : "memory"); -} - -#define _spin_trylock(lock) ({_raw_spin_trylock(lock) ? \ - 1 : ({ 0;});}) - -#define _spin_lock(lock) \ -do { \ - _raw_spin_lock(lock); \ -} while(0) - -#define _spin_unlock(lock) \ -do { \ - _raw_spin_unlock(lock); \ -} while (0) - - -#define spin_lock(lock) _spin_lock(lock) -#define spin_unlock(lock) _spin_unlock(lock) - -#define DEFINE_SPINLOCK(x) spinlock_t x = SPIN_LOCK_UNLOCKED - -#endif -- cgit v1.2.3