mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-15 13:22:55 +00:00
024b246ed2
Sam Ravnborg did the build-test that the direct header file move works, I'm just committing it. This is a pure move: mkdir arch/alpha/include git mv include/asm-alpha arch/alpha/include/asm with no other changes. Requested-and-tested-by: Sam Ravnborg <sam@ravnborg.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
#ifndef __ALPHA_PERCPU_H
|
|
#define __ALPHA_PERCPU_H
|
|
#include <linux/compiler.h>
|
|
#include <linux/threads.h>
|
|
|
|
/*
|
|
* Determine the real variable name from the name visible in the
|
|
* kernel sources.
|
|
*/
|
|
#define per_cpu_var(var) per_cpu__##var
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
/*
|
|
* per_cpu_offset() is the offset that has to be added to a
|
|
* percpu variable to get to the instance for a certain processor.
|
|
*/
|
|
extern unsigned long __per_cpu_offset[NR_CPUS];
|
|
|
|
#define per_cpu_offset(x) (__per_cpu_offset[x])
|
|
|
|
#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())
|
|
#ifdef CONFIG_DEBUG_PREEMPT
|
|
#define my_cpu_offset per_cpu_offset(smp_processor_id())
|
|
#else
|
|
#define my_cpu_offset __my_cpu_offset
|
|
#endif
|
|
|
|
#ifndef MODULE
|
|
#define SHIFT_PERCPU_PTR(var, offset) RELOC_HIDE(&per_cpu_var(var), (offset))
|
|
#define PER_CPU_ATTRIBUTES
|
|
#else
|
|
/*
|
|
* To calculate addresses of locally defined variables, GCC uses 32-bit
|
|
* displacement from the GP. Which doesn't work for per cpu variables in
|
|
* modules, as an offset to the kernel per cpu area is way above 4G.
|
|
*
|
|
* This forces allocation of a GOT entry for per cpu variable using
|
|
* ldq instruction with a 'literal' relocation.
|
|
*/
|
|
#define SHIFT_PERCPU_PTR(var, offset) ({ \
|
|
extern int simple_identifier_##var(void); \
|
|
unsigned long __ptr, tmp_gp; \
|
|
asm ( "br %1, 1f \n\
|
|
1: ldgp %1, 0(%1) \n\
|
|
ldq %0, per_cpu__" #var"(%1)\t!literal" \
|
|
: "=&r"(__ptr), "=&r"(tmp_gp)); \
|
|
(typeof(&per_cpu_var(var)))(__ptr + (offset)); })
|
|
|
|
#define PER_CPU_ATTRIBUTES __used
|
|
|
|
#endif /* MODULE */
|
|
|
|
/*
|
|
* A percpu variable may point to a discarded regions. The following are
|
|
* established ways to produce a usable pointer from the percpu variable
|
|
* offset.
|
|
*/
|
|
#define per_cpu(var, cpu) \
|
|
(*SHIFT_PERCPU_PTR(var, per_cpu_offset(cpu)))
|
|
#define __get_cpu_var(var) \
|
|
(*SHIFT_PERCPU_PTR(var, my_cpu_offset))
|
|
#define __raw_get_cpu_var(var) \
|
|
(*SHIFT_PERCPU_PTR(var, __my_cpu_offset))
|
|
|
|
#else /* ! SMP */
|
|
|
|
#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu_var(var)))
|
|
#define __get_cpu_var(var) per_cpu_var(var)
|
|
#define __raw_get_cpu_var(var) per_cpu_var(var)
|
|
|
|
#define PER_CPU_ATTRIBUTES
|
|
|
|
#endif /* SMP */
|
|
|
|
#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu_var(name)
|
|
|
|
#endif /* __ALPHA_PERCPU_H */
|