[linux-2.6-block.git] / include / asm-x86 / percpu.h

#ifndef _ASM_X86_PERCPU_H_
#define _ASM_X86_PERCPU_H_

#ifdef CONFIG_X86_64
#include <linux/compiler.h>

/* Same as asm-generic/percpu.h, except that we store the per cpu offset
   in the PDA. Longer term the PDA and every per cpu variable
   should be just put into a single section and referenced directly
   from %gs */

#ifdef CONFIG_SMP
#include <asm/pda.h>

#define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset)
#define __my_cpu_offset read_pda(data_offset)

#define per_cpu_offset(x) (__per_cpu_offset(x))

#endif
#include <asm-generic/percpu.h>

DECLARE_PER_CPU(struct x8664_pda, pda);

#else /* CONFIG_X86_64 */

#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)				\
	movl %fs:per_cpu__##this_cpu_off, reg;		\
	lea per_cpu__##var(reg), reg
#define PER_CPU_VAR(var)	%fs:per_cpu__##var
#else /* ! SMP */
#define PER_CPU(var, reg)			\
	movl $per_cpu__##var, reg
#define PER_CPU_VAR(var)	per_cpu__##var
#endif	/* SMP */

#else /* ...!ASSEMBLY */

/*
 * PER_CPU finds an address of a per-cpu variable.
 *
 * Args:
 *    var - variable name
 *    cpu - 32bit register containing the current CPU number
 *
 * The resulting address is stored in the "cpu" argument.
 *
 * Example:
 *    PER_CPU(cpu_gdt_descr, %ebx)
 */
#ifdef CONFIG_SMP

#define __my_cpu_offset x86_read_percpu(this_cpu_off)

/* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */
#define __percpu_seg "%%fs:"

#else  /* !SMP */

#define __percpu_seg ""

#endif	/* SMP */

#include <asm-generic/percpu.h>

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

/* 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) T__;			\
		if (0) { T__ tmp__; tmp__ = (val); }		\
		switch (sizeof(var)) {				\
		case 1:						\
			asm(op "b %1,"__percpu_seg"%0"		\
			    : "+m" (var)			\
			    :"ri" ((T__)val));			\
			break;					\
		case 2:						\
			asm(op "w %1,"__percpu_seg"%0"		\
			    : "+m" (var)			\
			    :"ri" ((T__)val));			\
			break;					\
		case 4:						\
			asm(op "l %1,"__percpu_seg"%0"		\
			    : "+m" (var)			\
			    :"ri" ((T__)val));			\
			break;					\
		default: __bad_percpu_size();			\
		}						\
	} while (0)

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

#define x86_read_percpu(var) percpu_from_op("mov", per_cpu__##var)
#define x86_write_percpu(var,val) percpu_to_op("mov", per_cpu__##var, val)
#define x86_add_percpu(var,val) percpu_to_op("add", per_cpu__##var, val)
#define x86_sub_percpu(var,val) percpu_to_op("sub", per_cpu__##var, val)
#define x86_or_percpu(var,val) percpu_to_op("or", per_cpu__##var, val)
#endif /* !__ASSEMBLY__ */
#endif /* !CONFIG_X86_64 */
#endif /* _ASM_X86_PERCPU_H_ */
Commit	Line	Data
3334052a	1	#ifndef _ASM_X86_PERCPU_H_
	2	#define _ASM_X86_PERCPU_H_
	3
	4	#ifdef CONFIG_X86_64
	5	#include <linux/compiler.h>
	6
	7	/* Same as asm-generic/percpu.h, except that we store the per cpu offset
	8	in the PDA. Longer term the PDA and every per cpu variable
	9	should be just put into a single section and referenced directly
	10	from %gs */
	11
	12	#ifdef CONFIG_SMP
	13	#include <asm/pda.h>
	14
	15	#define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset)
	16	#define __my_cpu_offset read_pda(data_offset)
	17
	18	#define per_cpu_offset(x) (__per_cpu_offset(x))
	19
96a388de	20	#endif
3334052a	21	#include <asm-generic/percpu.h>
	22
	23	DECLARE_PER_CPU(struct x8664_pda, pda);
	24
	25	#else /* CONFIG_X86_64 */
	26
	27	#ifdef __ASSEMBLY__
	28
	29	/*
	30	* PER_CPU finds an address of a per-cpu variable.
	31	*
	32	* Args:
	33	* var - variable name
	34	* reg - 32bit register
	35	*
	36	* The resulting address is stored in the "reg" argument.
	37	*
	38	* Example:
	39	* PER_CPU(cpu_gdt_descr, %ebx)
	40	*/
	41	#ifdef CONFIG_SMP
	42	#define PER_CPU(var, reg) \
	43	movl %fs:per_cpu__##this_cpu_off, reg; \
	44	lea per_cpu__##var(reg), reg
	45	#define PER_CPU_VAR(var) %fs:per_cpu__##var
	46	#else /* ! SMP */
	47	#define PER_CPU(var, reg) \
	48	movl $per_cpu__##var, reg
	49	#define PER_CPU_VAR(var) per_cpu__##var
	50	#endif /* SMP */
	51
	52	#else /* ...!ASSEMBLY */
	53
	54	/*
	55	* PER_CPU finds an address of a per-cpu variable.
	56	*
	57	* Args:
	58	* var - variable name
	59	* cpu - 32bit register containing the current CPU number
	60	*
	61	* The resulting address is stored in the "cpu" argument.
	62	*
	63	* Example:
	64	* PER_CPU(cpu_gdt_descr, %ebx)
	65	*/
	66	#ifdef CONFIG_SMP
	67
	68	#define __my_cpu_offset x86_read_percpu(this_cpu_off)
	69
	70	/* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */
	71	#define __percpu_seg "%%fs:"
	72
	73	#else /* !SMP */
	74
	75	#define __percpu_seg ""
	76
	77	#endif /* SMP */
	78
	79	#include <asm-generic/percpu.h>
	80
	81	/* We can use this directly for local CPU (faster). */
	82	DECLARE_PER_CPU(unsigned long, this_cpu_off);
	83
	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
88	#define percpu_to_op(op,var,val) \
89	do { \
90	typedef typeof(var) T__; \
91	if (0) { T__ tmp__; tmp__ = (val); } \
92	switch (sizeof(var)) { \
93	case 1: \
94	asm(op "b %1,"__percpu_seg"%0" \
95	: "+m" (var) \
96	:"ri" ((T__)val)); \
97	break; \
98	case 2: \
99	asm(op "w %1,"__percpu_seg"%0" \
100	: "+m" (var) \
101	:"ri" ((T__)val)); \
102	break; \
103	case 4: \
104	asm(op "l %1,"__percpu_seg"%0" \
105	: "+m" (var) \
106	:"ri" ((T__)val)); \
107	break; \
108	default: __bad_percpu_size(); \
109	} \
110	} while (0)
111
112	#define percpu_from_op(op,var) \
113	({ \
114	typeof(var) ret__; \
115	switch (sizeof(var)) { \
116	case 1: \
117	asm(op "b "__percpu_seg"%1,%0" \
118	: "=r" (ret__) \
119	: "m" (var)); \
120	break; \
121	case 2: \
122	asm(op "w "__percpu_seg"%1,%0" \
123	: "=r" (ret__) \
124	: "m" (var)); \
125	break; \
126	case 4: \
127	asm(op "l "__percpu_seg"%1,%0" \
128	: "=r" (ret__) \
129	: "m" (var)); \
130	break; \
131	default: __bad_percpu_size(); \
132	} \
133	ret__; })
134
135	#define x86_read_percpu(var) percpu_from_op("mov", per_cpu__##var)
136	#define x86_write_percpu(var,val) percpu_to_op("mov", per_cpu__##var, val)
137	#define x86_add_percpu(var,val) percpu_to_op("add", per_cpu__##var, val)
138	#define x86_sub_percpu(var,val) percpu_to_op("sub", per_cpu__##var, val)
139	#define x86_or_percpu(var,val) percpu_to_op("or", per_cpu__##var, val)
140	#endif /* !__ASSEMBLY__ */
141	#endif /* !CONFIG_X86_64 */
142	#endif /* _ASM_X86_PERCPU_H_ */