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Diffstat (limited to 'include/asm-blackfin/system.h')
| -rw-r--r-- | include/asm-blackfin/system.h | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/include/asm-blackfin/system.h b/include/asm-blackfin/system.h new file mode 100644 index 000000000000..758bac7c1e74 --- /dev/null +++ b/include/asm-blackfin/system.h @@ -0,0 +1,250 @@ +/* + * File: include/asm/system.h + * Based on: + * Author: Tony Kou (tonyko@lineo.ca) + * Copyright (c) 2002 Arcturus Networks Inc. + * (www.arcturusnetworks.com) + * Copyright (c) 2003 Metrowerks (www.metrowerks.com) + * Copyright (c) 2004 Analog Device Inc. + * Created: 25Jan2001 - Tony Kou + * Description: system.h include file + * + * Modified: 22Sep2006 - Robin Getz + * - move include blackfin.h down, so I can get access to + * irq functions in other include files. + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. + * If not, write to the Free Software Foundation, + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifndef _BLACKFIN_SYSTEM_H +#define _BLACKFIN_SYSTEM_H + +#include <linux/linkage.h> +#include <linux/compiler.h> + +/* + * Interrupt configuring macros. + */ + +extern unsigned long irq_flags; + +#define local_irq_enable() do { \ + __asm__ __volatile__ ( \ + "sti %0;" \ + ::"d"(irq_flags)); \ +} while (0) + +#define local_irq_disable() do { \ + int _tmp_dummy; \ + __asm__ __volatile__ ( \ + "cli %0;" \ + :"=d" (_tmp_dummy):); \ +} while (0) + +#if defined(ANOMALY_05000244) && defined (CONFIG_BLKFIN_CACHE) +#define idle_with_irq_disabled() do { \ + __asm__ __volatile__ ( \ + "nop; nop;\n" \ + ".align 8;\n" \ + "sti %0; idle;\n" \ + ::"d" (irq_flags)); \ +} while (0) +#else +#define idle_with_irq_disabled() do { \ + __asm__ __volatile__ ( \ + ".align 8;\n" \ + "sti %0; idle;\n" \ + ::"d" (irq_flags)); \ +} while (0) +#endif + +#ifdef CONFIG_DEBUG_HWERR +#define __save_and_cli(x) do { \ + __asm__ __volatile__ ( \ + "cli %0;\n\tsti %1;" \ + :"=&d"(x): "d" (0x3F)); \ +} while (0) +#else +#define __save_and_cli(x) do { \ + __asm__ __volatile__ ( \ + "cli %0;" \ + :"=&d"(x):); \ +} while (0) +#endif + +#define local_save_flags(x) asm volatile ("cli %0;" \ + "sti %0;" \ + :"=d"(x):); + +#ifdef CONFIG_DEBUG_HWERR +#define irqs_enabled_from_flags(x) (((x) & ~0x3f) != 0) +#else +#define irqs_enabled_from_flags(x) ((x) != 0x1f) +#endif + +#define local_irq_restore(x) do { \ + if (irqs_enabled_from_flags(x)) \ + local_irq_enable (); \ +} while (0) + +/* For spinlocks etc */ +#define local_irq_save(x) __save_and_cli(x) + +#define irqs_disabled() \ +({ \ + unsigned long flags; \ + local_save_flags(flags); \ + !irqs_enabled_from_flags(flags); \ +}) + +/* + * Force strict CPU ordering. + */ +#define nop() asm volatile ("nop;\n\t"::) +#define mb() asm volatile ("" : : :"memory") +#define rmb() asm volatile ("" : : :"memory") +#define wmb() asm volatile ("" : : :"memory") +#define set_rmb(var, value) do { (void) xchg(&var, value); } while (0) +#define set_mb(var, value) set_rmb(var, value) +#define set_wmb(var, value) do { var = value; wmb(); } while (0) + +#define read_barrier_depends() do { } while(0) + +#ifdef CONFIG_SMP +#define smp_mb() mb() +#define smp_rmb() rmb() +#define smp_wmb() wmb() +#define smp_read_barrier_depends() read_barrier_depends() +#else +#define smp_mb() barrier() +#define smp_rmb() barrier() +#define smp_wmb() barrier() +#define smp_read_barrier_depends() do { } while(0) +#endif + +#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) +#define tas(ptr) ((void)xchg((ptr),1)) + +struct __xchg_dummy { + unsigned long a[100]; +}; +#define __xg(x) ((volatile struct __xchg_dummy *)(x)) + +static inline unsigned long __xchg(unsigned long x, volatile void *ptr, + int size) +{ + unsigned long tmp = 0; + unsigned long flags = 0; + + local_irq_save(flags); + + switch (size) { + case 1: + __asm__ __volatile__ + ("%0 = b%2 (z);\n\t" + "b%2 = %1;\n\t" + : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); + break; + case 2: + __asm__ __volatile__ + ("%0 = w%2 (z);\n\t" + "w%2 = %1;\n\t" + : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); + break; + case 4: + __asm__ __volatile__ + ("%0 = %2;\n\t" + "%2 = %1;\n\t" + : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); + break; + } + local_irq_restore(flags); + return tmp; +} + +/* + * Atomic compare and exchange. Compare OLD with MEM, if identical, + * store NEW in MEM. Return the initial value in MEM. Success is + * indicated by comparing RETURN with OLD. + */ +static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, + unsigned long new, int size) +{ + unsigned long tmp = 0; + unsigned long flags = 0; + + local_irq_save(flags); + + switch (size) { + case 1: + __asm__ __volatile__ + ("%0 = b%3 (z);\n\t" + "CC = %1 == %0;\n\t" + "IF !CC JUMP 1f;\n\t" + "b%3 = %2;\n\t" + "1:\n\t" + : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); + break; + case 2: + __asm__ __volatile__ + ("%0 = w%3 (z);\n\t" + "CC = %1 == %0;\n\t" + "IF !CC JUMP 1f;\n\t" + "w%3 = %2;\n\t" + "1:\n\t" + : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); + break; + case 4: + __asm__ __volatile__ + ("%0 = %3;\n\t" + "CC = %1 == %0;\n\t" + "IF !CC JUMP 1f;\n\t" + "%3 = %2;\n\t" + "1:\n\t" + : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); + break; + } + local_irq_restore(flags); + return tmp; +} + +#define cmpxchg(ptr,o,n)\ + ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ + (unsigned long)(n),sizeof(*(ptr)))) + +#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. + */ + +#include <asm/blackfin.h> + +asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_struct *next); + +#define switch_to(prev,next,last) \ +do { \ + memcpy (&prev->thread_info->l1_task_info, L1_SCRATCH_TASK_INFO, \ + sizeof *L1_SCRATCH_TASK_INFO); \ + memcpy (L1_SCRATCH_TASK_INFO, &next->thread_info->l1_task_info, \ + sizeof *L1_SCRATCH_TASK_INFO); \ + (last) = resume (prev, next); \ +} while (0) + +#endif /* _BLACKFIN_SYSTEM_H */ |