forked from luck/tmp_suning_uos_patched
1956c73bb5
Define per_cpu_offset in asm-i386/percpu.h when SMP defined, like asm-generic/percpu.h does for UP. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de>
150 lines
4.1 KiB
C
150 lines
4.1 KiB
C
#ifndef __ARCH_I386_PERCPU__
|
|
#define __ARCH_I386_PERCPU__
|
|
|
|
#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
|
|
/* Same as generic implementation except for optimized local access. */
|
|
#define __GENERIC_PER_CPU
|
|
|
|
/* This is used for other cpus to find our section. */
|
|
extern unsigned long __per_cpu_offset[];
|
|
|
|
#define per_cpu_offset(x) (__per_cpu_offset[x])
|
|
|
|
/* Separate out the type, so (int[3], foo) works. */
|
|
#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
|
|
#define DEFINE_PER_CPU(type, name) \
|
|
__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
|
|
|
|
/* We can use this directly for local CPU (faster). */
|
|
DECLARE_PER_CPU(unsigned long, this_cpu_off);
|
|
|
|
/* var is in discarded region: offset to particular copy we want */
|
|
#define per_cpu(var, cpu) (*({ \
|
|
extern int simple_indentifier_##var(void); \
|
|
RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
|
|
|
|
#define __raw_get_cpu_var(var) (*({ \
|
|
extern int simple_indentifier_##var(void); \
|
|
RELOC_HIDE(&per_cpu__##var, x86_read_percpu(this_cpu_off)); \
|
|
}))
|
|
|
|
#define __get_cpu_var(var) __raw_get_cpu_var(var)
|
|
|
|
/* A macro to avoid #include hell... */
|
|
#define percpu_modcopy(pcpudst, src, size) \
|
|
do { \
|
|
unsigned int __i; \
|
|
for_each_possible_cpu(__i) \
|
|
memcpy((pcpudst)+__per_cpu_offset[__i], \
|
|
(src), (size)); \
|
|
} while (0)
|
|
|
|
#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
|
|
#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
|
|
|
|
/* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */
|
|
#define __percpu_seg "%%fs:"
|
|
#else /* !SMP */
|
|
#include <asm-generic/percpu.h>
|
|
#define __percpu_seg ""
|
|
#endif /* SMP */
|
|
|
|
/* 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 /* __ARCH_I386_PERCPU__ */
|