]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/asm-blackfin/system.h
2 * File: include/asm/system.h
4 * Author: Tony Kou (tonyko@lineo.ca)
5 * Copyright (c) 2002 Arcturus Networks Inc.
6 * (www.arcturusnetworks.com)
7 * Copyright (c) 2003 Metrowerks (www.metrowerks.com)
8 * Copyright (c) 2004 Analog Device Inc.
9 * Created: 25Jan2001 - Tony Kou
10 * Description: system.h include file
12 * Modified: 22Sep2006 - Robin Getz
13 * - move include blackfin.h down, so I can get access to
14 * irq functions in other include files.
16 * Bugs: Enter bugs at http://blackfin.uclinux.org/
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2, or (at your option)
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; see the file COPYING.
30 * If not, write to the Free Software Foundation,
31 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 #ifndef _BLACKFIN_SYSTEM_H
35 #define _BLACKFIN_SYSTEM_H
37 #include <linux/linkage.h>
38 #include <linux/compiler.h>
39 #include <asm/mach/anomaly.h>
42 * Interrupt configuring macros.
45 extern unsigned long irq_flags
;
47 #define local_irq_enable() \
48 __asm__ __volatile__( \
54 #define local_irq_disable() \
57 __asm__ __volatile__( \
59 : "=d" (__tmp_dummy) \
63 #if ANOMALY_05000244 && defined(CONFIG_BFIN_ICACHE)
64 # define NOP_PAD_ANOMALY_05000244 "nop; nop;"
66 # define NOP_PAD_ANOMALY_05000244
69 #define idle_with_irq_disabled() \
70 __asm__ __volatile__( \
71 NOP_PAD_ANOMALY_05000244 \
79 #ifdef CONFIG_DEBUG_HWERR
80 # define __save_and_cli(x) \
81 __asm__ __volatile__( \
88 # define __save_and_cli(x) \
89 __asm__ __volatile__( \
95 #define local_save_flags(x) \
96 __asm__ __volatile__( \
102 #ifdef CONFIG_DEBUG_HWERR
103 #define irqs_enabled_from_flags(x) (((x) & ~0x3f) != 0)
105 #define irqs_enabled_from_flags(x) ((x) != 0x1f)
108 #define local_irq_restore(x) \
110 if (irqs_enabled_from_flags(x)) \
111 local_irq_enable(); \
114 /* For spinlocks etc */
115 #define local_irq_save(x) __save_and_cli(x)
117 #define irqs_disabled() \
119 unsigned long flags; \
120 local_save_flags(flags); \
121 !irqs_enabled_from_flags(flags); \
125 * Force strict CPU ordering.
127 #define nop() asm volatile ("nop;\n\t"::)
128 #define mb() asm volatile ("" : : :"memory")
129 #define rmb() asm volatile ("" : : :"memory")
130 #define wmb() asm volatile ("" : : :"memory")
131 #define set_rmb(var, value) do { (void) xchg(&var, value); } while (0)
132 #define set_mb(var, value) set_rmb(var, value)
133 #define set_wmb(var, value) do { var = value; wmb(); } while (0)
135 #define read_barrier_depends() do { } while(0)
138 #define smp_mb() mb()
139 #define smp_rmb() rmb()
140 #define smp_wmb() wmb()
141 #define smp_read_barrier_depends() read_barrier_depends()
143 #define smp_mb() barrier()
144 #define smp_rmb() barrier()
145 #define smp_wmb() barrier()
146 #define smp_read_barrier_depends() do { } while(0)
149 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
151 struct __xchg_dummy
{
152 unsigned long a
[100];
154 #define __xg(x) ((volatile struct __xchg_dummy *)(x))
156 static inline unsigned long __xchg(unsigned long x
, volatile void *ptr
,
159 unsigned long tmp
= 0;
160 unsigned long flags
= 0;
162 local_irq_save(flags
);
169 : "=&d" (tmp
) : "d" (x
), "m" (*__xg(ptr
)) : "memory");
175 : "=&d" (tmp
) : "d" (x
), "m" (*__xg(ptr
)) : "memory");
181 : "=&d" (tmp
) : "d" (x
), "m" (*__xg(ptr
)) : "memory");
184 local_irq_restore(flags
);
189 * Atomic compare and exchange. Compare OLD with MEM, if identical,
190 * store NEW in MEM. Return the initial value in MEM. Success is
191 * indicated by comparing RETURN with OLD.
193 static inline unsigned long __cmpxchg(volatile void *ptr
, unsigned long old
,
194 unsigned long new, int size
)
196 unsigned long tmp
= 0;
197 unsigned long flags
= 0;
199 local_irq_save(flags
);
206 "IF !CC JUMP 1f;\n\t"
209 : "=&d" (tmp
) : "d" (old
), "d" (new), "m" (*__xg(ptr
)) : "memory");
215 "IF !CC JUMP 1f;\n\t"
218 : "=&d" (tmp
) : "d" (old
), "d" (new), "m" (*__xg(ptr
)) : "memory");
224 "IF !CC JUMP 1f;\n\t"
227 : "=&d" (tmp
) : "d" (old
), "d" (new), "m" (*__xg(ptr
)) : "memory");
230 local_irq_restore(flags
);
234 #define cmpxchg(ptr,o,n)\
235 ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
236 (unsigned long)(n),sizeof(*(ptr))))
238 #define prepare_to_switch() do { } while(0)
241 * switch_to(n) should switch tasks to task ptr, first checking that
242 * ptr isn't the current task, in which case it does nothing.
245 #include <asm/blackfin.h>
247 asmlinkage
struct task_struct
*resume(struct task_struct
*prev
, struct task_struct
*next
);
249 #define switch_to(prev,next,last) \
251 memcpy (&task_thread_info(prev)->l1_task_info, L1_SCRATCH_TASK_INFO, \
252 sizeof *L1_SCRATCH_TASK_INFO); \
253 memcpy (L1_SCRATCH_TASK_INFO, &task_thread_info(next)->l1_task_info, \
254 sizeof *L1_SCRATCH_TASK_INFO); \
255 (last) = resume (prev, next); \
258 #endif /* _BLACKFIN_SYSTEM_H */