[deliverable/linux.git] / arch / x86 / include / asm / percpu.h

#ifndef _ASM_X86_PERCPU_H
#define _ASM_X86_PERCPU_H

#ifdef CONFIG_X86_64
#define __percpu_seg		gs
#define __percpu_mov_op		movq
#else
#define __percpu_seg		fs
#define __percpu_mov_op		movl
#endif

#ifdef __ASSEMBLY__

/*
 * PER_CPU finds an address of a per-cpu variable.
 *
 * Args:
 *    var - variable name
 *    reg - 32bit register
 *
 * The resulting address is stored in the "reg" argument.
 *
 * Example:
 *    PER_CPU(cpu_gdt_descr, %ebx)
 */
#ifdef CONFIG_SMP
#define PER_CPU(var, reg)						\
	__percpu_mov_op %__percpu_seg:this_cpu_off, reg;		\
	lea var(reg), reg
#define PER_CPU_VAR(var)	%__percpu_seg:var
#else /* ! SMP */
#define PER_CPU(var, reg)	__percpu_mov_op $var, reg
#define PER_CPU_VAR(var)	var
#endif	/* SMP */

#ifdef CONFIG_X86_64_SMP
#define INIT_PER_CPU_VAR(var)  init_per_cpu__##var
#else
#define INIT_PER_CPU_VAR(var)  var
#endif

#else /* ...!ASSEMBLY */

#include <linux/kernel.h>
#include <linux/stringify.h>

#ifdef CONFIG_SMP
#define __percpu_arg(x)		"%%"__stringify(__percpu_seg)":%P" #x
#define __my_cpu_offset		percpu_read(this_cpu_off)

/*
 * Compared to the generic __my_cpu_offset version, the following
 * saves one instruction and avoids clobbering a temp register.
 */
#define __this_cpu_ptr(ptr)				\
({							\
	unsigned long tcp_ptr__;			\
	__verify_pcpu_ptr(ptr);				\
	asm volatile("add " __percpu_arg(1) ", %0"	\
		     : "=r" (tcp_ptr__)			\
		     : "m" (this_cpu_off), "0" (ptr));	\
	(typeof(*(ptr)) __kernel __force *)tcp_ptr__;	\
})
#else
#define __percpu_arg(x)		"%P" #x
#endif

/*
 * Initialized pointers to per-cpu variables needed for the boot
 * processor need to use these macros to get the proper address
 * offset from __per_cpu_load on SMP.
 *
 * There also must be an entry in vmlinux_64.lds.S
 */
#define DECLARE_INIT_PER_CPU(var) \
       extern typeof(var) init_per_cpu_var(var)

#ifdef CONFIG_X86_64_SMP
#define init_per_cpu_var(var)  init_per_cpu__##var
#else
#define init_per_cpu_var(var)  var
#endif

/* For arch-specific code, we can use direct single-insn ops (they
 * don't give an lvalue though). */
extern void __bad_percpu_size(void);

#define percpu_to_op(op, var, val)			\
do {							\
	typedef typeof(var) pto_T__;			\
	if (0) {					\
		pto_T__ pto_tmp__;			\
		pto_tmp__ = (val);			\
		(void)pto_tmp__;			\
	}						\
	switch (sizeof(var)) {				\
	case 1:						\
		asm(op "b %1,"__percpu_arg(0)		\
		    : "+m" (var)			\
		    : "qi" ((pto_T__)(val)));		\
		break;					\
	case 2:						\
		asm(op "w %1,"__percpu_arg(0)		\
		    : "+m" (var)			\
		    : "ri" ((pto_T__)(val)));		\
		break;					\
	case 4:						\
		asm(op "l %1,"__percpu_arg(0)		\
		    : "+m" (var)			\
		    : "ri" ((pto_T__)(val)));		\
		break;					\
	case 8:						\
		asm(op "q %1,"__percpu_arg(0)		\
		    : "+m" (var)			\
		    : "re" ((pto_T__)(val)));		\
		break;					\
	default: __bad_percpu_size();			\
	}						\
} while (0)

/*
 * Generate a percpu add to memory instruction and optimize code
 * if one is added or subtracted.
 */
#define percpu_add_op(var, val)						\
do {									\
	typedef typeof(var) pao_T__;					\
	const int pao_ID__ = (__builtin_constant_p(val) &&		\
			      ((val) == 1 || (val) == -1)) ? (val) : 0;	\
	if (0) {							\
		pao_T__ pao_tmp__;					\
		pao_tmp__ = (val);					\
		(void)pao_tmp__;					\
	}								\
	switch (sizeof(var)) {						\
	case 1:								\
		if (pao_ID__ == 1)					\
			asm("incb "__percpu_arg(0) : "+m" (var));	\
		else if (pao_ID__ == -1)				\
			asm("decb "__percpu_arg(0) : "+m" (var));	\
		else							\
			asm("addb %1, "__percpu_arg(0)			\
			    : "+m" (var)				\
			    : "qi" ((pao_T__)(val)));			\
		break;							\
	case 2:								\
		if (pao_ID__ == 1)					\
			asm("incw "__percpu_arg(0) : "+m" (var));	\
		else if (pao_ID__ == -1)				\
			asm("decw "__percpu_arg(0) : "+m" (var));	\
		else							\
			asm("addw %1, "__percpu_arg(0)			\
			    : "+m" (var)				\
			    : "ri" ((pao_T__)(val)));			\
		break;							\
	case 4:								\
		if (pao_ID__ == 1)					\
			asm("incl "__percpu_arg(0) : "+m" (var));	\
		else if (pao_ID__ == -1)				\
			asm("decl "__percpu_arg(0) : "+m" (var));	\
		else							\
			asm("addl %1, "__percpu_arg(0)			\
			    : "+m" (var)				\
			    : "ri" ((pao_T__)(val)));			\
		break;							\
	case 8:								\
		if (pao_ID__ == 1)					\
			asm("incq "__percpu_arg(0) : "+m" (var));	\
		else if (pao_ID__ == -1)				\
			asm("decq "__percpu_arg(0) : "+m" (var));	\
		else							\
			asm("addq %1, "__percpu_arg(0)			\
			    : "+m" (var)				\
			    : "re" ((pao_T__)(val)));			\
		break;							\
	default: __bad_percpu_size();					\
	}								\
} while (0)

#define percpu_from_op(op, var, constraint)		\
({							\
	typeof(var) pfo_ret__;				\
	switch (sizeof(var)) {				\
	case 1:						\
		asm(op "b "__percpu_arg(1)",%0"		\
		    : "=q" (pfo_ret__)			\
		    : constraint);			\
		break;					\
	case 2:						\
		asm(op "w "__percpu_arg(1)",%0"		\
		    : "=r" (pfo_ret__)			\
		    : constraint);			\
		break;					\
	case 4:						\
		asm(op "l "__percpu_arg(1)",%0"		\
		    : "=r" (pfo_ret__)			\
		    : constraint);			\
		break;					\
	case 8:						\
		asm(op "q "__percpu_arg(1)",%0"		\
		    : "=r" (pfo_ret__)			\
		    : constraint);			\
		break;					\
	default: __bad_percpu_size();			\
	}						\
	pfo_ret__;					\
})

#define percpu_unary_op(op, var)			\
({							\
	switch (sizeof(var)) {				\
	case 1:						\
		asm(op "b "__percpu_arg(0)		\
		    : "+m" (var));			\
		break;					\
	case 2:						\
		asm(op "w "__percpu_arg(0)		\
		    : "+m" (var));			\
		break;					\
	case 4:						\
		asm(op "l "__percpu_arg(0)		\
		    : "+m" (var));			\
		break;					\
	case 8:						\
		asm(op "q "__percpu_arg(0)		\
		    : "+m" (var));			\
		break;					\
	default: __bad_percpu_size();			\
	}						\
})

/*
 * Add return operation
 */
#define percpu_add_return_op(var, val)					\
({									\
	typeof(var) paro_ret__ = val;					\
	switch (sizeof(var)) {						\
	case 1:								\
		asm("xaddb %0, "__percpu_arg(1)				\
			    : "+q" (paro_ret__), "+m" (var)		\
			    : : "memory");				\
		break;							\
	case 2:								\
		asm("xaddw %0, "__percpu_arg(1)				\
			    : "+r" (paro_ret__), "+m" (var)		\
			    : : "memory");				\
		break;							\
	case 4:								\
		asm("xaddl %0, "__percpu_arg(1)				\
			    : "+r" (paro_ret__), "+m" (var)		\
			    : : "memory");				\
		break;							\
	case 8:								\
		asm("xaddq %0, "__percpu_arg(1)				\
			    : "+re" (paro_ret__), "+m" (var)		\
			    : : "memory");				\
		break;							\
	default: __bad_percpu_size();					\
	}								\
	paro_ret__ += val;						\
	paro_ret__;							\
})

/*
 * percpu_read() makes gcc load the percpu variable every time it is
 * accessed while percpu_read_stable() allows the value to be cached.
 * percpu_read_stable() is more efficient and can be used if its value
 * is guaranteed to be valid across cpus.  The current users include
 * get_current() and get_thread_info() both of which are actually
 * per-thread variables implemented as per-cpu variables and thus
 * stable for the duration of the respective task.
 */
#define percpu_read(var)		percpu_from_op("mov", var, "m" (var))
#define percpu_read_stable(var)		percpu_from_op("mov", var, "p" (&(var)))
#define percpu_write(var, val)		percpu_to_op("mov", var, val)
#define percpu_add(var, val)		percpu_add_op(var, val)
#define percpu_sub(var, val)		percpu_add_op(var, -(val))
#define percpu_and(var, val)		percpu_to_op("and", var, val)
#define percpu_or(var, val)		percpu_to_op("or", var, val)
#define percpu_xor(var, val)		percpu_to_op("xor", var, val)
#define percpu_inc(var)		percpu_unary_op("inc", var)

#define __this_cpu_read_1(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))
#define __this_cpu_read_2(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))
#define __this_cpu_read_4(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))

#define __this_cpu_write_1(pcp, val)	percpu_to_op("mov", (pcp), val)
#define __this_cpu_write_2(pcp, val)	percpu_to_op("mov", (pcp), val)
#define __this_cpu_write_4(pcp, val)	percpu_to_op("mov", (pcp), val)
#define __this_cpu_add_1(pcp, val)	percpu_add_op((pcp), val)
#define __this_cpu_add_2(pcp, val)	percpu_add_op((pcp), val)
#define __this_cpu_add_4(pcp, val)	percpu_add_op((pcp), val)
#define __this_cpu_and_1(pcp, val)	percpu_to_op("and", (pcp), val)
#define __this_cpu_and_2(pcp, val)	percpu_to_op("and", (pcp), val)
#define __this_cpu_and_4(pcp, val)	percpu_to_op("and", (pcp), val)
#define __this_cpu_or_1(pcp, val)	percpu_to_op("or", (pcp), val)
#define __this_cpu_or_2(pcp, val)	percpu_to_op("or", (pcp), val)
#define __this_cpu_or_4(pcp, val)	percpu_to_op("or", (pcp), val)
#define __this_cpu_xor_1(pcp, val)	percpu_to_op("xor", (pcp), val)
#define __this_cpu_xor_2(pcp, val)	percpu_to_op("xor", (pcp), val)
#define __this_cpu_xor_4(pcp, val)	percpu_to_op("xor", (pcp), val)

#define this_cpu_read_1(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))
#define this_cpu_read_2(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))
#define this_cpu_read_4(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))
#define this_cpu_write_1(pcp, val)	percpu_to_op("mov", (pcp), val)
#define this_cpu_write_2(pcp, val)	percpu_to_op("mov", (pcp), val)
#define this_cpu_write_4(pcp, val)	percpu_to_op("mov", (pcp), val)
#define this_cpu_add_1(pcp, val)	percpu_add_op((pcp), val)
#define this_cpu_add_2(pcp, val)	percpu_add_op((pcp), val)
#define this_cpu_add_4(pcp, val)	percpu_add_op((pcp), val)
#define this_cpu_and_1(pcp, val)	percpu_to_op("and", (pcp), val)
#define this_cpu_and_2(pcp, val)	percpu_to_op("and", (pcp), val)
#define this_cpu_and_4(pcp, val)	percpu_to_op("and", (pcp), val)
#define this_cpu_or_1(pcp, val)		percpu_to_op("or", (pcp), val)
#define this_cpu_or_2(pcp, val)		percpu_to_op("or", (pcp), val)
#define this_cpu_or_4(pcp, val)		percpu_to_op("or", (pcp), val)
#define this_cpu_xor_1(pcp, val)	percpu_to_op("xor", (pcp), val)
#define this_cpu_xor_2(pcp, val)	percpu_to_op("xor", (pcp), val)
#define this_cpu_xor_4(pcp, val)	percpu_to_op("xor", (pcp), val)

#define irqsafe_cpu_add_1(pcp, val)	percpu_add_op((pcp), val)
#define irqsafe_cpu_add_2(pcp, val)	percpu_add_op((pcp), val)
#define irqsafe_cpu_add_4(pcp, val)	percpu_add_op((pcp), val)
#define irqsafe_cpu_and_1(pcp, val)	percpu_to_op("and", (pcp), val)
#define irqsafe_cpu_and_2(pcp, val)	percpu_to_op("and", (pcp), val)
#define irqsafe_cpu_and_4(pcp, val)	percpu_to_op("and", (pcp), val)
#define irqsafe_cpu_or_1(pcp, val)	percpu_to_op("or", (pcp), val)
#define irqsafe_cpu_or_2(pcp, val)	percpu_to_op("or", (pcp), val)
#define irqsafe_cpu_or_4(pcp, val)	percpu_to_op("or", (pcp), val)
#define irqsafe_cpu_xor_1(pcp, val)	percpu_to_op("xor", (pcp), val)
#define irqsafe_cpu_xor_2(pcp, val)	percpu_to_op("xor", (pcp), val)
#define irqsafe_cpu_xor_4(pcp, val)	percpu_to_op("xor", (pcp), val)

#ifndef CONFIG_M386
#define __this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val)
#define __this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val)
#define __this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val)
#define this_cpu_add_return_1(pcp, val)	percpu_add_return_op(pcp, val)
#define this_cpu_add_return_2(pcp, val)	percpu_add_return_op(pcp, val)
#define this_cpu_add_return_4(pcp, val)	percpu_add_return_op(pcp, val)
#endif
/*
 * Per cpu atomic 64 bit operations are only available under 64 bit.
 * 32 bit must fall back to generic operations.
 */
#ifdef CONFIG_X86_64
#define __this_cpu_read_8(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))
#define __this_cpu_write_8(pcp, val)	percpu_to_op("mov", (pcp), val)
#define __this_cpu_add_8(pcp, val)	percpu_add_op((pcp), val)
#define __this_cpu_and_8(pcp, val)	percpu_to_op("and", (pcp), val)
#define __this_cpu_or_8(pcp, val)	percpu_to_op("or", (pcp), val)
#define __this_cpu_xor_8(pcp, val)	percpu_to_op("xor", (pcp), val)
#define __this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val)

#define this_cpu_read_8(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))
#define this_cpu_write_8(pcp, val)	percpu_to_op("mov", (pcp), val)
#define this_cpu_add_8(pcp, val)	percpu_add_op((pcp), val)
#define this_cpu_and_8(pcp, val)	percpu_to_op("and", (pcp), val)
#define this_cpu_or_8(pcp, val)		percpu_to_op("or", (pcp), val)
#define this_cpu_xor_8(pcp, val)	percpu_to_op("xor", (pcp), val)
#define this_cpu_add_return_8(pcp, val)	percpu_add_return_op(pcp, val)

#define irqsafe_cpu_add_8(pcp, val)	percpu_add_op((pcp), val)
#define irqsafe_cpu_and_8(pcp, val)	percpu_to_op("and", (pcp), val)
#define irqsafe_cpu_or_8(pcp, val)	percpu_to_op("or", (pcp), val)
#define irqsafe_cpu_xor_8(pcp, val)	percpu_to_op("xor", (pcp), val)
#endif

/* This is not atomic against other CPUs -- CPU preemption needs to be off */
#define x86_test_and_clear_bit_percpu(bit, var)				\
({									\
	int old__;							\
	asm volatile("btr %2,"__percpu_arg(1)"\n\tsbbl %0,%0"		\
		     : "=r" (old__), "+m" (var)				\
		     : "dIr" (bit));					\
	old__;								\
})

#include <asm-generic/percpu.h>

/* We can use this directly for local CPU (faster). */
DECLARE_PER_CPU(unsigned long, this_cpu_off);

#endif /* !__ASSEMBLY__ */

#ifdef CONFIG_SMP

/*
 * Define the "EARLY_PER_CPU" macros.  These are used for some per_cpu
 * variables that are initialized and accessed before there are per_cpu
 * areas allocated.
 */

#define	DEFINE_EARLY_PER_CPU(_type, _name, _initvalue)			\
	DEFINE_PER_CPU(_type, _name) = _initvalue;			\
	__typeof__(_type) _name##_early_map[NR_CPUS] __initdata =	\
				{ [0 ... NR_CPUS-1] = _initvalue };	\
	__typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map

#define EXPORT_EARLY_PER_CPU_SYMBOL(_name)			\
	EXPORT_PER_CPU_SYMBOL(_name)

#define DECLARE_EARLY_PER_CPU(_type, _name)			\
	DECLARE_PER_CPU(_type, _name);				\
	extern __typeof__(_type) *_name##_early_ptr;		\
	extern __typeof__(_type)  _name##_early_map[]

#define	early_per_cpu_ptr(_name) (_name##_early_ptr)
#define	early_per_cpu_map(_name, _idx) (_name##_early_map[_idx])
#define	early_per_cpu(_name, _cpu) 				\
	*(early_per_cpu_ptr(_name) ?				\
		&early_per_cpu_ptr(_name)[_cpu] :		\
		&per_cpu(_name, _cpu))

#else	/* !CONFIG_SMP */
#define	DEFINE_EARLY_PER_CPU(_type, _name, _initvalue)		\
	DEFINE_PER_CPU(_type, _name) = _initvalue

#define EXPORT_EARLY_PER_CPU_SYMBOL(_name)			\
	EXPORT_PER_CPU_SYMBOL(_name)

#define DECLARE_EARLY_PER_CPU(_type, _name)			\
	DECLARE_PER_CPU(_type, _name)

#define	early_per_cpu(_name, _cpu) per_cpu(_name, _cpu)
#define	early_per_cpu_ptr(_name) NULL
/* no early_per_cpu_map() */

#endif	/* !CONFIG_SMP */

#endif /* _ASM_X86_PERCPU_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_PERCPU_H
1965aae3 PA	2	#define _ASM_X86_PERCPU_H
3334052a	3
1a51e3a0	4	#ifdef CONFIG_X86_64
9939ddaf TH	5	#define __percpu_seg gs
9939ddaf TH	6	#define __percpu_mov_op movq
1a51e3a0	7	#else
9939ddaf TH	8	#define __percpu_seg fs
9939ddaf TH	9	#define __percpu_mov_op movl
96a388de	10	#endif
3334052a	11
	12	#ifdef __ASSEMBLY__
	13
	14	/*
	15	* PER_CPU finds an address of a per-cpu variable.
	16	*
	17	* Args:
	18	* var - variable name
	19	* reg - 32bit register
	20	*
	21	* The resulting address is stored in the "reg" argument.
	22	*
	23	* Example:
	24	* PER_CPU(cpu_gdt_descr, %ebx)
	25	*/
	26	#ifdef CONFIG_SMP
9939ddaf	27	#define PER_CPU(var, reg) \
dd17c8f7 RR	28	__percpu_mov_op %__percpu_seg:this_cpu_off, reg; \
	29	lea var(reg), reg
	30	#define PER_CPU_VAR(var) %__percpu_seg:var
3334052a	31	#else /* ! SMP */
dd17c8f7 RR	32	#define PER_CPU(var, reg) __percpu_mov_op $var, reg
dd17c8f7 RR	33	#define PER_CPU_VAR(var) var
3334052a	34	#endif /* SMP */
3334052a	35
2add8e23 BG	36	#ifdef CONFIG_X86_64_SMP
	37	#define INIT_PER_CPU_VAR(var) init_per_cpu__##var
	38	#else
dd17c8f7	39	#define INIT_PER_CPU_VAR(var) var
2add8e23 BG	40	#endif
2add8e23 BG	41
3334052a	42	#else /* ...!ASSEMBLY */
3334052a	43
e59a1bb2	44	#include <linux/kernel.h>
9939ddaf	45	#include <linux/stringify.h>
3334052a	46
9939ddaf	47	#ifdef CONFIG_SMP
87b26406	48	#define __percpu_arg(x) "%%"__stringify(__percpu_seg)":%P" #x
6dbde353	49	#define __my_cpu_offset percpu_read(this_cpu_off)
db7829c6 BG	50
	51	/*
	52	* Compared to the generic __my_cpu_offset version, the following
	53	* saves one instruction and avoids clobbering a temp register.
	54	*/
	55	#define __this_cpu_ptr(ptr) \
	56	({ \
	57	unsigned long tcp_ptr__; \
	58	__verify_pcpu_ptr(ptr); \
	59	asm volatile("add " __percpu_arg(1) ", %0" \
	60	: "=r" (tcp_ptr__) \
	61	: "m" (this_cpu_off), "0" (ptr)); \
	62	(typeof((ptr)) __kernel __force )tcp_ptr__; \
	63	})
9939ddaf	64	#else
ed8d9adf	65	#define __percpu_arg(x) "%P" #x
9939ddaf	66	#endif
3334052a	67
2add8e23 BG	68	/*
	69	* Initialized pointers to per-cpu variables needed for the boot
	70	* processor need to use these macros to get the proper address
	71	* offset from __per_cpu_load on SMP.
	72	*
	73	* There also must be an entry in vmlinux_64.lds.S
	74	*/
	75	#define DECLARE_INIT_PER_CPU(var) \
dd17c8f7	76	extern typeof(var) init_per_cpu_var(var)
2add8e23 BG	77
	78	#ifdef CONFIG_X86_64_SMP
	79	#define init_per_cpu_var(var) init_per_cpu__##var
	80	#else
dd17c8f7	81	#define init_per_cpu_var(var) var
2add8e23 BG	82	#endif
2add8e23 BG	83
3334052a	84	/* For arch-specific code, we can use direct single-insn ops (they
	85	* don't give an lvalue though). */
	86	extern void __bad_percpu_size(void);
	87
bc9e3be2 JP	88	#define percpu_to_op(op, var, val) \
bc9e3be2 JP	89	do { \
0f5e4816	90	typedef typeof(var) pto_T__; \
bc9e3be2	91	if (0) { \
0f5e4816 TH	92	pto_T__ pto_tmp__; \
0f5e4816 TH	93	pto_tmp__ = (val); \
23b764d0	94	(void)pto_tmp__; \
bc9e3be2 JP	95	} \
	96	switch (sizeof(var)) { \
	97	case 1: \
87b26406	98	asm(op "b %1,"__percpu_arg(0) \
bc9e3be2	99	: "+m" (var) \
0f5e4816	100	: "qi" ((pto_T__)(val))); \
bc9e3be2 JP	101	break; \
bc9e3be2 JP	102	case 2: \
87b26406	103	asm(op "w %1,"__percpu_arg(0) \
bc9e3be2	104	: "+m" (var) \
0f5e4816	105	: "ri" ((pto_T__)(val))); \
bc9e3be2 JP	106	break; \
bc9e3be2 JP	107	case 4: \
87b26406	108	asm(op "l %1,"__percpu_arg(0) \
bc9e3be2	109	: "+m" (var) \
0f5e4816	110	: "ri" ((pto_T__)(val))); \
bc9e3be2	111	break; \
9939ddaf	112	case 8: \
87b26406	113	asm(op "q %1,"__percpu_arg(0) \
9939ddaf	114	: "+m" (var) \
0f5e4816	115	: "re" ((pto_T__)(val))); \
9939ddaf	116	break; \
bc9e3be2 JP	117	default: __bad_percpu_size(); \
	118	} \
	119	} while (0)
	120
5917dae8 CL	121	/*
5917dae8 CL	122	* Generate a percpu add to memory instruction and optimize code
40f0a5d0	123	* if one is added or subtracted.
5917dae8 CL	124	*/
	125	#define percpu_add_op(var, val) \
	126	do { \
	127	typedef typeof(var) pao_T__; \
	128	const int pao_ID__ = (__builtin_constant_p(val) && \
	129	((val) == 1 \|\| (val) == -1)) ? (val) : 0; \
	130	if (0) { \
	131	pao_T__ pao_tmp__; \
	132	pao_tmp__ = (val); \
23b764d0	133	(void)pao_tmp__; \
5917dae8 CL	134	} \
	135	switch (sizeof(var)) { \
	136	case 1: \
	137	if (pao_ID__ == 1) \
	138	asm("incb "__percpu_arg(0) : "+m" (var)); \
	139	else if (pao_ID__ == -1) \
	140	asm("decb "__percpu_arg(0) : "+m" (var)); \
	141	else \
	142	asm("addb %1, "__percpu_arg(0) \
	143	: "+m" (var) \
	144	: "qi" ((pao_T__)(val))); \
	145	break; \
	146	case 2: \
	147	if (pao_ID__ == 1) \
	148	asm("incw "__percpu_arg(0) : "+m" (var)); \
	149	else if (pao_ID__ == -1) \
	150	asm("decw "__percpu_arg(0) : "+m" (var)); \
	151	else \
	152	asm("addw %1, "__percpu_arg(0) \
	153	: "+m" (var) \
	154	: "ri" ((pao_T__)(val))); \
	155	break; \
	156	case 4: \
	157	if (pao_ID__ == 1) \
	158	asm("incl "__percpu_arg(0) : "+m" (var)); \
	159	else if (pao_ID__ == -1) \
	160	asm("decl "__percpu_arg(0) : "+m" (var)); \
	161	else \
	162	asm("addl %1, "__percpu_arg(0) \
	163	: "+m" (var) \
	164	: "ri" ((pao_T__)(val))); \
	165	break; \
	166	case 8: \
	167	if (pao_ID__ == 1) \
	168	asm("incq "__percpu_arg(0) : "+m" (var)); \
	169	else if (pao_ID__ == -1) \
	170	asm("decq "__percpu_arg(0) : "+m" (var)); \
	171	else \
	172	asm("addq %1, "__percpu_arg(0) \
	173	: "+m" (var) \
	174	: "re" ((pao_T__)(val))); \
	175	break; \
	176	default: __bad_percpu_size(); \
	177	} \
	178	} while (0)
	179
ed8d9adf	180	#define percpu_from_op(op, var, constraint) \
bc9e3be2	181	({ \
0f5e4816	182	typeof(var) pfo_ret__; \
bc9e3be2 JP	183	switch (sizeof(var)) { \
bc9e3be2 JP	184	case 1: \
87b26406	185	asm(op "b "__percpu_arg(1)",%0" \
0f5e4816	186	: "=q" (pfo_ret__) \
ed8d9adf	187	: constraint); \
bc9e3be2 JP	188	break; \
bc9e3be2 JP	189	case 2: \
87b26406	190	asm(op "w "__percpu_arg(1)",%0" \
0f5e4816	191	: "=r" (pfo_ret__) \
ed8d9adf	192	: constraint); \
bc9e3be2 JP	193	break; \
bc9e3be2 JP	194	case 4: \
87b26406	195	asm(op "l "__percpu_arg(1)",%0" \
0f5e4816	196	: "=r" (pfo_ret__) \
ed8d9adf	197	: constraint); \
9939ddaf TH	198	break; \
9939ddaf TH	199	case 8: \
87b26406	200	asm(op "q "__percpu_arg(1)",%0" \
0f5e4816	201	: "=r" (pfo_ret__) \
ed8d9adf	202	: constraint); \
bc9e3be2 JP	203	break; \
	204	default: __bad_percpu_size(); \
	205	} \
0f5e4816	206	pfo_ret__; \
bc9e3be2	207	})
3334052a	208
402af0d7 JB	209	#define percpu_unary_op(op, var) \
	210	({ \
	211	switch (sizeof(var)) { \
	212	case 1: \
	213	asm(op "b "__percpu_arg(0) \
	214	: "+m" (var)); \
	215	break; \
	216	case 2: \
	217	asm(op "w "__percpu_arg(0) \
	218	: "+m" (var)); \
	219	break; \
	220	case 4: \
	221	asm(op "l "__percpu_arg(0) \
	222	: "+m" (var)); \
	223	break; \
	224	case 8: \
	225	asm(op "q "__percpu_arg(0) \
	226	: "+m" (var)); \
	227	break; \
	228	default: __bad_percpu_size(); \
	229	} \
	230	})
	231
40304775 TH	232	/*
	233	* Add return operation
	234	*/
	235	#define percpu_add_return_op(var, val) \
	236	({ \
	237	typeof(var) paro_ret__ = val; \
	238	switch (sizeof(var)) { \
	239	case 1: \
	240	asm("xaddb %0, "__percpu_arg(1) \
	241	: "+q" (paro_ret__), "+m" (var) \
	242	: : "memory"); \
	243	break; \
	244	case 2: \
	245	asm("xaddw %0, "__percpu_arg(1) \
	246	: "+r" (paro_ret__), "+m" (var) \
	247	: : "memory"); \
	248	break; \
	249	case 4: \
	250	asm("xaddl %0, "__percpu_arg(1) \
	251	: "+r" (paro_ret__), "+m" (var) \
	252	: : "memory"); \
	253	break; \
	254	case 8: \
	255	asm("xaddq %0, "__percpu_arg(1) \
	256	: "+re" (paro_ret__), "+m" (var) \
	257	: : "memory"); \
	258	break; \
	259	default: __bad_percpu_size(); \
	260	} \
	261	paro_ret__ += val; \
	262	paro_ret__; \
	263	})
	264
ed8d9adf LT	265	/*
	266	* percpu_read() makes gcc load the percpu variable every time it is
	267	* accessed while percpu_read_stable() allows the value to be cached.
	268	* percpu_read_stable() is more efficient and can be used if its value
	269	* is guaranteed to be valid across cpus. The current users include
	270	* get_current() and get_thread_info() both of which are actually
	271	* per-thread variables implemented as per-cpu variables and thus
	272	* stable for the duration of the respective task.
	273	*/
dd17c8f7 RR	274	#define percpu_read(var) percpu_from_op("mov", var, "m" (var))
	275	#define percpu_read_stable(var) percpu_from_op("mov", var, "p" (&(var)))
	276	#define percpu_write(var, val) percpu_to_op("mov", var, val)
5917dae8 CL	277	#define percpu_add(var, val) percpu_add_op(var, val)
5917dae8 CL	278	#define percpu_sub(var, val) percpu_add_op(var, -(val))
dd17c8f7 RR	279	#define percpu_and(var, val) percpu_to_op("and", var, val)
	280	#define percpu_or(var, val) percpu_to_op("or", var, val)
	281	#define percpu_xor(var, val) percpu_to_op("xor", var, val)
402af0d7	282	#define percpu_inc(var) percpu_unary_op("inc", var)
9939ddaf	283
30ed1a79 CL	284	#define __this_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
	285	#define __this_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
	286	#define __this_cpu_read_4(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
	287
	288	#define __this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
	289	#define __this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
	290	#define __this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
5917dae8 CL	291	#define __this_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
	292	#define __this_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
	293	#define __this_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
30ed1a79 CL	294	#define __this_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
	295	#define __this_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
	296	#define __this_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
	297	#define __this_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val)
	298	#define __this_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val)
	299	#define __this_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val)
	300	#define __this_cpu_xor_1(pcp, val) percpu_to_op("xor", (pcp), val)
	301	#define __this_cpu_xor_2(pcp, val) percpu_to_op("xor", (pcp), val)
	302	#define __this_cpu_xor_4(pcp, val) percpu_to_op("xor", (pcp), val)
	303
	304	#define this_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
	305	#define this_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
	306	#define this_cpu_read_4(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
	307	#define this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
	308	#define this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
	309	#define this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
5917dae8 CL	310	#define this_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
	311	#define this_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
	312	#define this_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
30ed1a79 CL	313	#define this_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
	314	#define this_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
	315	#define this_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
	316	#define this_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val)
	317	#define this_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val)
	318	#define this_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val)
	319	#define this_cpu_xor_1(pcp, val) percpu_to_op("xor", (pcp), val)
	320	#define this_cpu_xor_2(pcp, val) percpu_to_op("xor", (pcp), val)
	321	#define this_cpu_xor_4(pcp, val) percpu_to_op("xor", (pcp), val)
	322
5917dae8 CL	323	#define irqsafe_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
	324	#define irqsafe_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
	325	#define irqsafe_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
30ed1a79 CL	326	#define irqsafe_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
	327	#define irqsafe_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
	328	#define irqsafe_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
	329	#define irqsafe_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val)
	330	#define irqsafe_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val)
	331	#define irqsafe_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val)
	332	#define irqsafe_cpu_xor_1(pcp, val) percpu_to_op("xor", (pcp), val)
	333	#define irqsafe_cpu_xor_2(pcp, val) percpu_to_op("xor", (pcp), val)
	334	#define irqsafe_cpu_xor_4(pcp, val) percpu_to_op("xor", (pcp), val)
	335
8f1d97c7 CL	336	#ifndef CONFIG_M386
	337	#define __this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val)
	338	#define __this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val)
	339	#define __this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val)
	340	#define this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val)
	341	#define this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val)
	342	#define this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val)
	343	#endif
30ed1a79 CL	344	/*
	345	* Per cpu atomic 64 bit operations are only available under 64 bit.
	346	* 32 bit must fall back to generic operations.
	347	*/
	348	#ifdef CONFIG_X86_64
	349	#define __this_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
	350	#define __this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
5917dae8	351	#define __this_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
30ed1a79 CL	352	#define __this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
	353	#define __this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
	354	#define __this_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val)
40304775	355	#define __this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val)
30ed1a79 CL	356
	357	#define this_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
	358	#define this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
5917dae8	359	#define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
30ed1a79 CL	360	#define this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
	361	#define this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
	362	#define this_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val)
40304775	363	#define this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val)
30ed1a79	364
5917dae8	365	#define irqsafe_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
30ed1a79 CL	366	#define irqsafe_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
	367	#define irqsafe_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
	368	#define irqsafe_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val)
30ed1a79 CL	369	#endif
30ed1a79 CL	370
49357d19 TH	371	/* This is not atomic against other CPUs -- CPU preemption needs to be off */
	372	#define x86_test_and_clear_bit_percpu(bit, var) \
	373	({ \
	374	int old__; \
87b26406	375	asm volatile("btr %2,"__percpu_arg(1)"\n\tsbbl %0,%0" \
dd17c8f7	376	: "=r" (old__), "+m" (var) \
87b26406	377	: "dIr" (bit)); \
49357d19 TH	378	old__; \
	379	})
	380
6dbde353 IM	381	#include <asm-generic/percpu.h>
	382
	383	/* We can use this directly for local CPU (faster). */
	384	DECLARE_PER_CPU(unsigned long, this_cpu_off);
	385
3334052a	386	#endif /* !__ASSEMBLY__ */
23ca4bba MT	387
	388	#ifdef CONFIG_SMP
	389
	390	/*
	391	* Define the "EARLY_PER_CPU" macros. These are used for some per_cpu
	392	* variables that are initialized and accessed before there are per_cpu
	393	* areas allocated.
	394	*/
	395
	396	#define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \
	397	DEFINE_PER_CPU(_type, _name) = _initvalue; \
	398	__typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \
	399	{ [0 ... NR_CPUS-1] = _initvalue }; \
c6a92a25	400	__typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map
23ca4bba MT	401
	402	#define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
	403	EXPORT_PER_CPU_SYMBOL(_name)
	404
	405	#define DECLARE_EARLY_PER_CPU(_type, _name) \
	406	DECLARE_PER_CPU(_type, _name); \
	407	extern __typeof__(_type) *_name##_early_ptr; \
	408	extern __typeof__(_type) _name##_early_map[]
	409
	410	#define early_per_cpu_ptr(_name) (_name##_early_ptr)
	411	#define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx])
	412	#define early_per_cpu(_name, _cpu) \
f10fcd47 TH	413	*(early_per_cpu_ptr(_name) ? \
	414	&early_per_cpu_ptr(_name)[_cpu] : \
	415	&per_cpu(_name, _cpu))
23ca4bba MT	416
	417	#else /* !CONFIG_SMP */
	418	#define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \
	419	DEFINE_PER_CPU(_type, _name) = _initvalue
	420
	421	#define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
	422	EXPORT_PER_CPU_SYMBOL(_name)
	423
	424	#define DECLARE_EARLY_PER_CPU(_type, _name) \
	425	DECLARE_PER_CPU(_type, _name)
	426
	427	#define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu)
	428	#define early_per_cpu_ptr(_name) NULL
	429	/* no early_per_cpu_map() */
	430
	431	#endif /* !CONFIG_SMP */
	432
1965aae3	433	#endif /* _ASM_X86_PERCPU_H */