arch/arm/include/asm/system.h - third_party/linux - Git at Google

 #ifndef __ASM_ARM_SYSTEM_H
 #define __ASM_ARM_SYSTEM_H

 #ifdef __KERNEL__

 #define CPU_ARCH_UNKNOWN	0
 #define CPU_ARCH_ARMv3		1
 #define CPU_ARCH_ARMv4		2
 #define CPU_ARCH_ARMv4T		3
 #define CPU_ARCH_ARMv5		4
 #define CPU_ARCH_ARMv5T		5
 #define CPU_ARCH_ARMv5TE	6
 #define CPU_ARCH_ARMv5TEJ	7
 #define CPU_ARCH_ARMv6		8
 #define CPU_ARCH_ARMv7		9

 /*
  * CR1 bits (CP#15 CR1)
  */
 #define CR_M	(1 << 0)	/* MMU enable				*/
 #define CR_A	(1 << 1)	/* Alignment abort enable		*/
 #define CR_C	(1 << 2)	/* Dcache enable			*/
 #define CR_W	(1 << 3)	/* Write buffer enable			*/
 #define CR_P	(1 << 4)	/* 32-bit exception handler		*/
 #define CR_D	(1 << 5)	/* 32-bit data address range		*/
 #define CR_L	(1 << 6)	/* Implementation defined		*/
 #define CR_B	(1 << 7)	/* Big endian				*/
 #define CR_S	(1 << 8)	/* System MMU protection		*/
 #define CR_R	(1 << 9)	/* ROM MMU protection			*/
 #define CR_F	(1 << 10)	/* Implementation defined		*/
 #define CR_Z	(1 << 11)	/* Implementation defined		*/
 #define CR_I	(1 << 12)	/* Icache enable			*/
 #define CR_V	(1 << 13)	/* Vectors relocated to 0xffff0000	*/
 #define CR_RR	(1 << 14)	/* Round Robin cache replacement	*/
 #define CR_L4	(1 << 15)	/* LDR pc can set T bit			*/
 #define CR_DT	(1 << 16)
 #define CR_IT	(1 << 18)
 #define CR_ST	(1 << 19)
 #define CR_FI	(1 << 21)	/* Fast interrupt (lower latency mode)	*/
 #define CR_U	(1 << 22)	/* Unaligned access operation		*/
 #define CR_XP	(1 << 23)	/* Extended page tables			*/
 #define CR_VE	(1 << 24)	/* Vectored interrupts			*/
 #define CR_EE	(1 << 25)	/* Exception (Big) Endian		*/
 #define CR_TRE	(1 << 28)	/* TEX remap enable			*/
 #define CR_AFE	(1 << 29)	/* Access flag enable			*/
 #define CR_TE	(1 << 30)	/* Thumb exception enable		*/

 /*
  * This is used to ensure the compiler did actually allocate the register we
  * asked it for some inline assembly sequences.  Apparently we can't trust
  * the compiler from one version to another so a bit of paranoia won't hurt.
  * This string is meant to be concatenated with the inline asm string and
  * will cause compilation to stop on mismatch.
  * (for details, see gcc PR 15089)
  */
 #define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"

 #ifndef __ASSEMBLY__

 #include <linux/compiler.h>
 #include <linux/linkage.h>
 #include <linux/irqflags.h>

 #include <asm/outercache.h>

 struct thread_info;
 struct task_struct;

 /* information about the system we're running on */
 extern unsigned int system_rev;
 extern unsigned int system_serial_low;
 extern unsigned int system_serial_high;
 extern unsigned int mem_fclk_21285;

 struct pt_regs;

 void die(const char *msg, struct pt_regs *regs, int err);

 struct siginfo;
 void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
 		unsigned long err, unsigned long trap);

 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
 				       struct pt_regs *),
 		     int sig, int code, const char *name);

 void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
 				       struct pt_regs *),
 		     int sig, int code, const char *name);

 #define xchg(ptr,x) \
 	((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))

 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);

 struct mm_struct;
 extern void show_pte(struct mm_struct *mm, unsigned long addr);
 extern void __show_regs(struct pt_regs *);

 extern int __pure cpu_architecture(void);
 extern void cpu_init(void);

 void arm_machine_restart(char mode, const char *cmd);
 extern void (*arm_pm_restart)(char str, const char *cmd);

 #define UDBG_UNDEFINED	(1 << 0)
 #define UDBG_SYSCALL	(1 << 1)
 #define UDBG_BADABORT	(1 << 2)
 #define UDBG_SEGV	(1 << 3)
 #define UDBG_BUS	(1 << 4)

 extern unsigned int user_debug;

 #if __LINUX_ARM_ARCH__ >= 4
 #define vectors_high()	(cr_alignment & CR_V)
 #else
 #define vectors_high()	(0)
 #endif

 #if __LINUX_ARM_ARCH__ >= 7 ||		\
 	(__LINUX_ARM_ARCH__ == 6 && defined(CONFIG_CPU_32v6K))
 #define sev()	__asm__ __volatile__ ("sev" : : : "memory")
 #define wfe()	__asm__ __volatile__ ("wfe" : : : "memory")
 #define wfi()	__asm__ __volatile__ ("wfi" : : : "memory")
 #endif

 #if __LINUX_ARM_ARCH__ >= 7
 #define isb() __asm__ __volatile__ ("isb" : : : "memory")
 #define dsb() __asm__ __volatile__ ("dsb" : : : "memory")
 #define dmb() __asm__ __volatile__ ("dmb" : : : "memory")
 #elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6
 #define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
 				    : : "r" (0) : "memory")
 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
 				    : : "r" (0) : "memory")
 #define dmb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
 				    : : "r" (0) : "memory")
 #elif defined(CONFIG_CPU_FA526)
 #define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
 				    : : "r" (0) : "memory")
 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
 				    : : "r" (0) : "memory")
 #define dmb() __asm__ __volatile__ ("" : : : "memory")
 #else
 #define isb() __asm__ __volatile__ ("" : : : "memory")
 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
 				    : : "r" (0) : "memory")
 #define dmb() __asm__ __volatile__ ("" : : : "memory")
 #endif

 #ifdef CONFIG_ARCH_HAS_BARRIERS
 #include <mach/barriers.h>
 #elif defined(CONFIG_ARM_DMA_MEM_BUFFERABLE) || defined(CONFIG_SMP)
 #define mb()		do { dsb(); outer_sync(); } while (0)
 #define rmb()		dsb()
 #define wmb()		mb()
 #else
 #include <asm/memory.h>
 #define mb()	do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
 #define rmb()	do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
 #define wmb()	do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
 #endif

 #ifndef CONFIG_SMP
 #define smp_mb()	barrier()
 #define smp_rmb()	barrier()
 #define smp_wmb()	barrier()
 #else
 #define smp_mb()	dmb()
 #define smp_rmb()	dmb()
 #define smp_wmb()	dmb()
 #endif

 #define read_barrier_depends()		do { } while(0)
 #define smp_read_barrier_depends()	do { } while(0)

 #define set_mb(var, value)	do { var = value; smp_mb(); } while (0)
 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");

 extern unsigned long cr_no_alignment;	/* defined in entry-armv.S */
 extern unsigned long cr_alignment;	/* defined in entry-armv.S */

 static inline unsigned int get_cr(void)
 {
 	unsigned int val;
 	asm("mrc p15, 0, %0, c1, c0, 0	@ get CR" : "=r" (val) : : "cc");
 	return val;
 }

 static inline void set_cr(unsigned int val)
 {
 	asm volatile("mcr p15, 0, %0, c1, c0, 0	@ set CR"
 	  : : "r" (val) : "cc");
 	isb();
 }

 #ifndef CONFIG_SMP
 extern void adjust_cr(unsigned long mask, unsigned long set);
 #endif

 #define CPACC_FULL(n)		(3 << (n * 2))
 #define CPACC_SVC(n)		(1 << (n * 2))
 #define CPACC_DISABLE(n)	(0 << (n * 2))

 static inline unsigned int get_copro_access(void)
 {
 	unsigned int val;
 	asm("mrc p15, 0, %0, c1, c0, 2 @ get copro access"
 	  : "=r" (val) : : "cc");
 	return val;
 }

 static inline void set_copro_access(unsigned int val)
 {
 	asm volatile("mcr p15, 0, %0, c1, c0, 2 @ set copro access"
 	  : : "r" (val) : "cc");
 	isb();
 }

 /*
  * switch_mm() may do a full cache flush over the context switch,
  * so enable interrupts over the context switch to avoid high
  * latency.
  */
 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW

 /*
  * switch_to(prev, next) should switch from task `prev' to `next'
  * `prev' will never be the same as `next'.  schedule() itself
  * contains the memory barrier to tell GCC not to cache `current'.
  */
 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);

 #define switch_to(prev,next,last)					\
 do {									\
 	last = __switch_to(prev,task_thread_info(prev), task_thread_info(next));	\
 } while (0)

 #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
 /*
  * On the StrongARM, "swp" is terminally broken since it bypasses the
  * cache totally.  This means that the cache becomes inconsistent, and,
  * since we use normal loads/stores as well, this is really bad.
  * Typically, this causes oopsen in filp_close, but could have other,
  * more disastrous effects.  There are two work-arounds:
  *  1. Disable interrupts and emulate the atomic swap
  *  2. Clean the cache, perform atomic swap, flush the cache
  *
  * We choose (1) since its the "easiest" to achieve here and is not
  * dependent on the processor type.
  *
  * NOTE that this solution won't work on an SMP system, so explcitly
  * forbid it here.
  */
 #define swp_is_buggy
 #endif

 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
 {
 	extern void __bad_xchg(volatile void *, int);
 	unsigned long ret;
 #ifdef swp_is_buggy
 	unsigned long flags;
 #endif
 #if __LINUX_ARM_ARCH__ >= 6
 	unsigned int tmp;
 #endif

 	smp_mb();

 	switch (size) {
 #if __LINUX_ARM_ARCH__ >= 6
 	case 1:
 		asm volatile("@	__xchg1\n"
 		"1:	ldrexb	%0, [%3]\n"
 		"	strexb	%1, %2, [%3]\n"
 		"	teq	%1, #0\n"
 		"	bne	1b"
 			: "=&r" (ret), "=&r" (tmp)
 			: "r" (x), "r" (ptr)
 			: "memory", "cc");
 		break;
 	case 4:
 		asm volatile("@	__xchg4\n"
 		"1:	ldrex	%0, [%3]\n"
 		"	strex	%1, %2, [%3]\n"
 		"	teq	%1, #0\n"
 		"	bne	1b"
 			: "=&r" (ret), "=&r" (tmp)
 			: "r" (x), "r" (ptr)
 			: "memory", "cc");
 		break;
 #elif defined(swp_is_buggy)
 #ifdef CONFIG_SMP
 #error SMP is not supported on this platform
 #endif
 	case 1:
 		raw_local_irq_save(flags);
 		ret = *(volatile unsigned char *)ptr;
 		*(volatile unsigned char *)ptr = x;
 		raw_local_irq_restore(flags);
 		break;

 	case 4:
 		raw_local_irq_save(flags);
 		ret = *(volatile unsigned long *)ptr;
 		*(volatile unsigned long *)ptr = x;
 		raw_local_irq_restore(flags);
 		break;
 #else
 	case 1:
 		asm volatile("@	__xchg1\n"
 		"	swpb	%0, %1, [%2]"
 			: "=&r" (ret)
 			: "r" (x), "r" (ptr)
 			: "memory", "cc");
 		break;
 	case 4:
 		asm volatile("@	__xchg4\n"
 		"	swp	%0, %1, [%2]"
 			: "=&r" (ret)
 			: "r" (x), "r" (ptr)
 			: "memory", "cc");
 		break;
 #endif
 	default:
 		__bad_xchg(ptr, size), ret = 0;
 		break;
 	}
 	smp_mb();

 	return ret;
 }

 extern void disable_hlt(void);
 extern void enable_hlt(void);

 void cpu_idle_wait(void);

 #include <asm-generic/cmpxchg-local.h>

 #if __LINUX_ARM_ARCH__ < 6
 /* min ARCH < ARMv6 */

 #ifdef CONFIG_SMP
 #error "SMP is not supported on this platform"
 #endif

 /*
  * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
  * them available.
  */
 #define cmpxchg_local(ptr, o, n)				  	       \
 	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
 			(unsigned long)(n), sizeof(*(ptr))))
 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))

 #ifndef CONFIG_SMP
 #include <asm-generic/cmpxchg.h>
 #endif

 #else	/* min ARCH >= ARMv6 */

 extern void __bad_cmpxchg(volatile void *ptr, int size);

 /*
  * cmpxchg only support 32-bits operands on ARMv6.
  */

 static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
 				      unsigned long new, int size)
 {
 	unsigned long oldval, res;

 	switch (size) {
 #ifndef CONFIG_CPU_V6	/* min ARCH >= ARMv6K */
 	case 1:
 		do {
 			asm volatile("@ __cmpxchg1\n"
 			"	ldrexb	%1, [%2]\n"
 			"	mov	%0, #0\n"
 			"	teq	%1, %3\n"
 			"	strexbeq %0, %4, [%2]\n"
 				: "=&r" (res), "=&r" (oldval)
 				: "r" (ptr), "Ir" (old), "r" (new)
 				: "memory", "cc");
 		} while (res);
 		break;
 	case 2:
 		do {
 			asm volatile("@ __cmpxchg1\n"
 			"	ldrexh	%1, [%2]\n"
 			"	mov	%0, #0\n"
 			"	teq	%1, %3\n"
 			"	strexheq %0, %4, [%2]\n"
 				: "=&r" (res), "=&r" (oldval)
 				: "r" (ptr), "Ir" (old), "r" (new)
 				: "memory", "cc");
 		} while (res);
 		break;
 #endif
 	case 4:
 		do {
 			asm volatile("@ __cmpxchg4\n"
 			"	ldrex	%1, [%2]\n"
 			"	mov	%0, #0\n"
 			"	teq	%1, %3\n"
 			"	strexeq %0, %4, [%2]\n"
 				: "=&r" (res), "=&r" (oldval)
 				: "r" (ptr), "Ir" (old), "r" (new)
 				: "memory", "cc");
 		} while (res);
 		break;
 	default:
 		__bad_cmpxchg(ptr, size);
 		oldval = 0;
 	}

 	return oldval;
 }

 static inline unsigned long __cmpxchg_mb(volatile void *ptr, unsigned long old,
 					 unsigned long new, int size)
 {
 	unsigned long ret;

 	smp_mb();
 	ret = __cmpxchg(ptr, old, new, size);
 	smp_mb();

 	return ret;
 }

 #define cmpxchg(ptr,o,n)						\
 	((__typeof__(*(ptr)))__cmpxchg_mb((ptr),			\
 					  (unsigned long)(o),		\
 					  (unsigned long)(n),		\
 					  sizeof(*(ptr))))

 static inline unsigned long __cmpxchg_local(volatile void *ptr,
 					    unsigned long old,
 					    unsigned long new, int size)
 {
 	unsigned long ret;

 	switch (size) {
 #ifdef CONFIG_CPU_V6	/* min ARCH == ARMv6 */
 	case 1:
 	case 2:
 		ret = __cmpxchg_local_generic(ptr, old, new, size);
 		break;
 #endif
 	default:
 		ret = __cmpxchg(ptr, old, new, size);
 	}

 	return ret;
 }

 #define cmpxchg_local(ptr,o,n)						\
 	((__typeof__(*(ptr)))__cmpxchg_local((ptr),			\
 				       (unsigned long)(o),		\
 				       (unsigned long)(n),		\
 				       sizeof(*(ptr))))

 #ifndef CONFIG_CPU_V6	/* min ARCH >= ARMv6K */

 /*
  * Note : ARMv7-M (currently unsupported by Linux) does not support
  * ldrexd/strexd. If ARMv7-M is ever supported by the Linux kernel, it should
  * not be allowed to use __cmpxchg64.
  */
 static inline unsigned long long __cmpxchg64(volatile void *ptr,
 					     unsigned long long old,
 					     unsigned long long new)
 {
 	register unsigned long long oldval asm("r0");
 	register unsigned long long __old asm("r2") = old;
 	register unsigned long long __new asm("r4") = new;
 	unsigned long res;

 	do {
 		asm volatile(
 		"	@ __cmpxchg8\n"
 		"	ldrexd	%1, %H1, [%2]\n"
 		"	mov	%0, #0\n"
 		"	teq	%1, %3\n"
 		"	teqeq	%H1, %H3\n"
 		"	strexdeq %0, %4, %H4, [%2]\n"
 			: "=&r" (res), "=&r" (oldval)
 			: "r" (ptr), "Ir" (__old), "r" (__new)
 			: "memory", "cc");
 	} while (res);

 	return oldval;
 }

 static inline unsigned long long __cmpxchg64_mb(volatile void *ptr,
 						unsigned long long old,
 						unsigned long long new)
 {
 	unsigned long long ret;

 	smp_mb();
 	ret = __cmpxchg64(ptr, old, new);
 	smp_mb();

 	return ret;
 }

 #define cmpxchg64(ptr,o,n)						\
 	((__typeof__(*(ptr)))__cmpxchg64_mb((ptr),			\
 					    (unsigned long long)(o),	\
 					    (unsigned long long)(n)))

 #define cmpxchg64_local(ptr,o,n)					\
 	((__typeof__(*(ptr)))__cmpxchg64((ptr),				\
 					 (unsigned long long)(o),	\
 					 (unsigned long long)(n)))

 #else /* min ARCH = ARMv6 */

 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))

 #endif

 #endif	/* __LINUX_ARM_ARCH__ >= 6 */

 #endif /* __ASSEMBLY__ */

 #define arch_align_stack(x) (x)

 #endif /* __KERNEL__ */

 #endif
	#ifndef __ASM_ARM_SYSTEM_H
	#define __ASM_ARM_SYSTEM_H

	#ifdef __KERNEL__

	#define CPU_ARCH_UNKNOWN 0
	#define CPU_ARCH_ARMv3 1
	#define CPU_ARCH_ARMv4 2
	#define CPU_ARCH_ARMv4T 3
	#define CPU_ARCH_ARMv5 4
	#define CPU_ARCH_ARMv5T 5
	#define CPU_ARCH_ARMv5TE 6
	#define CPU_ARCH_ARMv5TEJ 7
	#define CPU_ARCH_ARMv6 8
	#define CPU_ARCH_ARMv7 9

	/*
	* CR1 bits (CP#15 CR1)
	*/
	#define CR_M (1 << 0) /* MMU enable */
	#define CR_A (1 << 1) /* Alignment abort enable */
	#define CR_C (1 << 2) /* Dcache enable */
	#define CR_W (1 << 3) /* Write buffer enable */
	#define CR_P (1 << 4) /* 32-bit exception handler */
	#define CR_D (1 << 5) /* 32-bit data address range */
	#define CR_L (1 << 6) /* Implementation defined */
	#define CR_B (1 << 7) /* Big endian */
	#define CR_S (1 << 8) /* System MMU protection */
	#define CR_R (1 << 9) /* ROM MMU protection */
	#define CR_F (1 << 10) /* Implementation defined */
	#define CR_Z (1 << 11) /* Implementation defined */
	#define CR_I (1 << 12) /* Icache enable */
	#define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */
	#define CR_RR (1 << 14) /* Round Robin cache replacement */
	#define CR_L4 (1 << 15) /* LDR pc can set T bit */
	#define CR_DT (1 << 16)
	#define CR_IT (1 << 18)
	#define CR_ST (1 << 19)
	#define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */
	#define CR_U (1 << 22) /* Unaligned access operation */
	#define CR_XP (1 << 23) /* Extended page tables */
	#define CR_VE (1 << 24) /* Vectored interrupts */
	#define CR_EE (1 << 25) /* Exception (Big) Endian */
	#define CR_TRE (1 << 28) /* TEX remap enable */
	#define CR_AFE (1 << 29) /* Access flag enable */
	#define CR_TE (1 << 30) /* Thumb exception enable */

	/*
	* This is used to ensure the compiler did actually allocate the register we
	* asked it for some inline assembly sequences. Apparently we can't trust
	* the compiler from one version to another so a bit of paranoia won't hurt.
	* This string is meant to be concatenated with the inline asm string and
	* will cause compilation to stop on mismatch.
	* (for details, see gcc PR 15089)
	*/
	#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"

	#ifndef __ASSEMBLY__

	#include <linux/compiler.h>
	#include <linux/linkage.h>
	#include <linux/irqflags.h>

	#include <asm/outercache.h>

	struct thread_info;
	struct task_struct;

	/* information about the system we're running on */
	extern unsigned int system_rev;
	extern unsigned int system_serial_low;
	extern unsigned int system_serial_high;
	extern unsigned int mem_fclk_21285;

	struct pt_regs;

	void die(const char msg, struct pt_regs regs, int err);

	struct siginfo;
	void arm_notify_die(const char str, struct pt_regs regs, struct siginfo *info,
	unsigned long err, unsigned long trap);

	void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
	struct pt_regs *),
	int sig, int code, const char *name);

	void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
	struct pt_regs *),
	int sig, int code, const char *name);

	#define xchg(ptr,x) \
	((__typeof__((ptr)))__xchg((unsigned long)(x),(ptr),sizeof((ptr))))

	extern asmlinkage void c_backtrace(unsigned long fp, int pmode);

	struct mm_struct;
	extern void show_pte(struct mm_struct *mm, unsigned long addr);
	extern void __show_regs(struct pt_regs *);

	extern int __pure cpu_architecture(void);
	extern void cpu_init(void);

	void arm_machine_restart(char mode, const char *cmd);
	extern void (arm_pm_restart)(char str, const char cmd);

	#define UDBG_UNDEFINED (1 << 0)
	#define UDBG_SYSCALL (1 << 1)
	#define UDBG_BADABORT (1 << 2)
	#define UDBG_SEGV (1 << 3)
	#define UDBG_BUS (1 << 4)

	extern unsigned int user_debug;

	#if __LINUX_ARM_ARCH__ >= 4
	#define vectors_high() (cr_alignment & CR_V)
	#else
	#define vectors_high() (0)
	#endif

	#if __LINUX_ARM_ARCH__ >= 7 \|\| \
	(__LINUX_ARM_ARCH__ == 6 && defined(CONFIG_CPU_32v6K))
	#define sev() __asm__ __volatile__ ("sev" : : : "memory")
	#define wfe() __asm__ __volatile__ ("wfe" : : : "memory")
	#define wfi() __asm__ __volatile__ ("wfi" : : : "memory")
	#endif

	#if __LINUX_ARM_ARCH__ >= 7
	#define isb() __asm__ __volatile__ ("isb" : : : "memory")
	#define dsb() __asm__ __volatile__ ("dsb" : : : "memory")
	#define dmb() __asm__ __volatile__ ("dmb" : : : "memory")
	#elif defined(CONFIG_CPU_XSC3) \|\| __LINUX_ARM_ARCH__ == 6
	#define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
	: : "r" (0) : "memory")
	#define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
	: : "r" (0) : "memory")
	#define dmb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
	: : "r" (0) : "memory")
	#elif defined(CONFIG_CPU_FA526)
	#define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
	: : "r" (0) : "memory")
	#define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
	: : "r" (0) : "memory")
	#define dmb() __asm__ __volatile__ ("" : : : "memory")
	#else
	#define isb() __asm__ __volatile__ ("" : : : "memory")
	#define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
	: : "r" (0) : "memory")
	#define dmb() __asm__ __volatile__ ("" : : : "memory")
	#endif

	#ifdef CONFIG_ARCH_HAS_BARRIERS
	#include <mach/barriers.h>
	#elif defined(CONFIG_ARM_DMA_MEM_BUFFERABLE) \|\| defined(CONFIG_SMP)
	#define mb() do { dsb(); outer_sync(); } while (0)
	#define rmb() dsb()
	#define wmb() mb()
	#else
	#include <asm/memory.h>
	#define mb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
	#define rmb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
	#define wmb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
	#endif

	#ifndef CONFIG_SMP
	#define smp_mb() barrier()
	#define smp_rmb() barrier()
	#define smp_wmb() barrier()
	#else
	#define smp_mb() dmb()
	#define smp_rmb() dmb()
	#define smp_wmb() dmb()
	#endif

	#define read_barrier_depends() do { } while(0)
	#define smp_read_barrier_depends() do { } while(0)

	#define set_mb(var, value) do { var = value; smp_mb(); } while (0)
	#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");

	extern unsigned long cr_no_alignment; /* defined in entry-armv.S */
	extern unsigned long cr_alignment; /* defined in entry-armv.S */

	static inline unsigned int get_cr(void)
	{
	unsigned int val;
	asm("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc");
	return val;
	}

	static inline void set_cr(unsigned int val)
	{
	asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
	: : "r" (val) : "cc");
	isb();
	}

	#ifndef CONFIG_SMP
	extern void adjust_cr(unsigned long mask, unsigned long set);
	#endif

	#define CPACC_FULL(n) (3 << (n * 2))
	#define CPACC_SVC(n) (1 << (n * 2))
	#define CPACC_DISABLE(n) (0 << (n * 2))

	static inline unsigned int get_copro_access(void)
	{
	unsigned int val;
	asm("mrc p15, 0, %0, c1, c0, 2 @ get copro access"
	: "=r" (val) : : "cc");
	return val;
	}

	static inline void set_copro_access(unsigned int val)
	{
	asm volatile("mcr p15, 0, %0, c1, c0, 2 @ set copro access"
	: : "r" (val) : "cc");
	isb();
	}

	/*
	* switch_mm() may do a full cache flush over the context switch,
	* so enable interrupts over the context switch to avoid high
	* latency.
	*/
	#define __ARCH_WANT_INTERRUPTS_ON_CTXSW

	/*
	* switch_to(prev, next) should switch from task `prev' to `next'
	* `prev' will never be the same as `next'. schedule() itself
	* contains the memory barrier to tell GCC not to cache `current'.
	*/
	extern struct task_struct __switch_to(struct task_struct , struct thread_info , struct thread_info );

	#define switch_to(prev,next,last) \
	do { \
	last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
	} while (0)

	#if defined(CONFIG_CPU_SA1100) \|\| defined(CONFIG_CPU_SA110)
	/*
	* On the StrongARM, "swp" is terminally broken since it bypasses the
	* cache totally. This means that the cache becomes inconsistent, and,
	* since we use normal loads/stores as well, this is really bad.
	* Typically, this causes oopsen in filp_close, but could have other,
	* more disastrous effects. There are two work-arounds:
	* 1. Disable interrupts and emulate the atomic swap
	* 2. Clean the cache, perform atomic swap, flush the cache
	*
	* We choose (1) since its the "easiest" to achieve here and is not
	* dependent on the processor type.
	*
	* NOTE that this solution won't work on an SMP system, so explcitly
	* forbid it here.
	*/
	#define swp_is_buggy
	#endif

	static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
	{
	extern void __bad_xchg(volatile void *, int);
	unsigned long ret;
	#ifdef swp_is_buggy
	unsigned long flags;
	#endif
	#if __LINUX_ARM_ARCH__ >= 6
	unsigned int tmp;
	#endif

	smp_mb();

	switch (size) {
	#if __LINUX_ARM_ARCH__ >= 6
	case 1:
	asm volatile("@ __xchg1\n"
	"1: ldrexb %0, [%3]\n"
	" strexb %1, %2, [%3]\n"
	" teq %1, #0\n"
	" bne 1b"
	: "=&r" (ret), "=&r" (tmp)
	: "r" (x), "r" (ptr)
	: "memory", "cc");
	break;
	case 4:
	asm volatile("@ __xchg4\n"
	"1: ldrex %0, [%3]\n"
	" strex %1, %2, [%3]\n"
	" teq %1, #0\n"
	" bne 1b"
	: "=&r" (ret), "=&r" (tmp)
	: "r" (x), "r" (ptr)
	: "memory", "cc");
	break;
	#elif defined(swp_is_buggy)
	#ifdef CONFIG_SMP
	#error SMP is not supported on this platform
	#endif
	case 1:
	raw_local_irq_save(flags);
	ret = (volatile unsigned char )ptr;
	(volatile unsigned char )ptr = x;
	raw_local_irq_restore(flags);
	break;

	case 4:
	raw_local_irq_save(flags);
	ret = (volatile unsigned long )ptr;
	(volatile unsigned long )ptr = x;
	raw_local_irq_restore(flags);
	break;
	#else
	case 1:
	asm volatile("@ __xchg1\n"
	" swpb %0, %1, [%2]"
	: "=&r" (ret)
	: "r" (x), "r" (ptr)
	: "memory", "cc");
	break;
	case 4:
	asm volatile("@ __xchg4\n"
	" swp %0, %1, [%2]"
	: "=&r" (ret)
	: "r" (x), "r" (ptr)
	: "memory", "cc");
	break;
	#endif
	default:
	__bad_xchg(ptr, size), ret = 0;
	break;
	}
	smp_mb();

	return ret;
	}

	extern void disable_hlt(void);
	extern void enable_hlt(void);

	void cpu_idle_wait(void);

	#include <asm-generic/cmpxchg-local.h>

	#if __LINUX_ARM_ARCH__ < 6
	/* min ARCH < ARMv6 */

	#ifdef CONFIG_SMP
	#error "SMP is not supported on this platform"
	#endif

	/*
	* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
	* them available.
	*/
	#define cmpxchg_local(ptr, o, n) \
	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
	(unsigned long)(n), sizeof(*(ptr))))
	#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))

	#ifndef CONFIG_SMP
	#include <asm-generic/cmpxchg.h>
	#endif

	#else /* min ARCH >= ARMv6 */

	extern void __bad_cmpxchg(volatile void *ptr, int size);

	/*
	* cmpxchg only support 32-bits operands on ARMv6.
	*/

	static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
	unsigned long new, int size)
	{
	unsigned long oldval, res;

	switch (size) {
	#ifndef CONFIG_CPU_V6 /* min ARCH >= ARMv6K */
	case 1:
	do {
	asm volatile("@ __cmpxchg1\n"
	" ldrexb %1, [%2]\n"
	" mov %0, #0\n"
	" teq %1, %3\n"
	" strexbeq %0, %4, [%2]\n"
	: "=&r" (res), "=&r" (oldval)
	: "r" (ptr), "Ir" (old), "r" (new)
	: "memory", "cc");
	} while (res);
	break;
	case 2:
	do {
	asm volatile("@ __cmpxchg1\n"
	" ldrexh %1, [%2]\n"
	" mov %0, #0\n"
	" teq %1, %3\n"
	" strexheq %0, %4, [%2]\n"
	: "=&r" (res), "=&r" (oldval)
	: "r" (ptr), "Ir" (old), "r" (new)
	: "memory", "cc");
	} while (res);
	break;
	#endif
	case 4:
	do {
	asm volatile("@ __cmpxchg4\n"
	" ldrex %1, [%2]\n"
	" mov %0, #0\n"
	" teq %1, %3\n"
	" strexeq %0, %4, [%2]\n"
	: "=&r" (res), "=&r" (oldval)
	: "r" (ptr), "Ir" (old), "r" (new)
	: "memory", "cc");
	} while (res);
	break;
	default:
	__bad_cmpxchg(ptr, size);
	oldval = 0;
	}

	return oldval;
	}

	static inline unsigned long __cmpxchg_mb(volatile void *ptr, unsigned long old,
	unsigned long new, int size)
	{
	unsigned long ret;

	smp_mb();
	ret = __cmpxchg(ptr, old, new, size);
	smp_mb();

	return ret;
	}

	#define cmpxchg(ptr,o,n) \
	((__typeof__(*(ptr)))__cmpxchg_mb((ptr), \
	(unsigned long)(o), \
	(unsigned long)(n), \
	sizeof(*(ptr))))

	static inline unsigned long __cmpxchg_local(volatile void *ptr,
	unsigned long old,
	unsigned long new, int size)
	{
	unsigned long ret;

	switch (size) {
	#ifdef CONFIG_CPU_V6 /* min ARCH == ARMv6 */
	case 1:
	case 2:
	ret = __cmpxchg_local_generic(ptr, old, new, size);
	break;
	#endif
	default:
	ret = __cmpxchg(ptr, old, new, size);
	}

	return ret;
	}

	#define cmpxchg_local(ptr,o,n) \
	((__typeof__(*(ptr)))__cmpxchg_local((ptr), \
	(unsigned long)(o), \
	(unsigned long)(n), \
	sizeof(*(ptr))))

	#ifndef CONFIG_CPU_V6 /* min ARCH >= ARMv6K */

	/*
	* Note : ARMv7-M (currently unsupported by Linux) does not support
	* ldrexd/strexd. If ARMv7-M is ever supported by the Linux kernel, it should
	* not be allowed to use __cmpxchg64.
	*/
	static inline unsigned long long __cmpxchg64(volatile void *ptr,
	unsigned long long old,
	unsigned long long new)
	{
	register unsigned long long oldval asm("r0");
	register unsigned long long __old asm("r2") = old;
	register unsigned long long __new asm("r4") = new;
	unsigned long res;

	do {
	asm volatile(
	" @ __cmpxchg8\n"
	" ldrexd %1, %H1, [%2]\n"
	" mov %0, #0\n"
	" teq %1, %3\n"
	" teqeq %H1, %H3\n"
	" strexdeq %0, %4, %H4, [%2]\n"
	: "=&r" (res), "=&r" (oldval)
	: "r" (ptr), "Ir" (__old), "r" (__new)
	: "memory", "cc");
	} while (res);

	return oldval;
	}

	static inline unsigned long long __cmpxchg64_mb(volatile void *ptr,
	unsigned long long old,
	unsigned long long new)
	{
	unsigned long long ret;

	smp_mb();
	ret = __cmpxchg64(ptr, old, new);
	smp_mb();

	return ret;
	}

	#define cmpxchg64(ptr,o,n) \
	((__typeof__(*(ptr)))__cmpxchg64_mb((ptr), \
	(unsigned long long)(o), \
	(unsigned long long)(n)))

	#define cmpxchg64_local(ptr,o,n) \
	((__typeof__(*(ptr)))__cmpxchg64((ptr), \
	(unsigned long long)(o), \
	(unsigned long long)(n)))

	#else /* min ARCH = ARMv6 */

	#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))

	#endif

	#endif /* __LINUX_ARM_ARCH__ >= 6 */

	#endif /* __ASSEMBLY__ */

	#define arch_align_stack(x) (x)

	#endif /* __KERNEL__ */

	#endif