| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _ASM_IA64_PERCPU_H |
| 2 | #define _ASM_IA64_PERCPU_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 2002-2003 Hewlett-Packard Co |
| 6 | * David Mosberger-Tang <davidm@hpl.hp.com> |
| 7 | */ |
| 8 | |
| 9 | #define PERCPU_ENOUGH_ROOM PERCPU_PAGE_SIZE |
| 10 | |
| 11 | #ifdef __ASSEMBLY__ |
| 12 | # define THIS_CPU(var) (per_cpu__##var) /* use this to mark accesses to per-CPU variables... */ |
| 13 | #else /* !__ASSEMBLY__ */ |
| 14 | |
| 15 | #include <linux/config.h> |
| 16 | |
| 17 | #include <linux/threads.h> |
| 18 | |
| 19 | #ifdef HAVE_MODEL_SMALL_ATTRIBUTE |
| 20 | # define __SMALL_ADDR_AREA __attribute__((__model__ (__small__))) |
| 21 | #else |
| 22 | # define __SMALL_ADDR_AREA |
| 23 | #endif |
| 24 | |
| 25 | #define DECLARE_PER_CPU(type, name) \ |
| 26 | extern __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name |
| 27 | |
| 28 | /* Separate out the type, so (int[3], foo) works. */ |
| 29 | #define DEFINE_PER_CPU(type, name) \ |
| 30 | __attribute__((__section__(".data.percpu"))) \ |
| 31 | __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name |
| 32 | |
| 33 | /* |
| 34 | * Pretty much a literal copy of asm-generic/percpu.h, except that percpu_modcopy() is an |
| 35 | * external routine, to avoid include-hell. |
| 36 | */ |
| 37 | #ifdef CONFIG_SMP |
| 38 | |
| 39 | extern unsigned long __per_cpu_offset[NR_CPUS]; |
| 40 | |
| 41 | /* Equal to __per_cpu_offset[smp_processor_id()], but faster to access: */ |
| 42 | DECLARE_PER_CPU(unsigned long, local_per_cpu_offset); |
| 43 | |
| 44 | #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu])) |
| 45 | #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __ia64_per_cpu_var(local_per_cpu_offset))) |
| 46 | |
| 47 | extern void percpu_modcopy(void *pcpudst, const void *src, unsigned long size); |
| 48 | extern void setup_per_cpu_areas (void); |
| 49 | extern void *per_cpu_init(void); |
| 50 | |
| 51 | #else /* ! SMP */ |
| 52 | |
| 53 | #define per_cpu(var, cpu) (*((void)cpu, &per_cpu__##var)) |
| 54 | #define __get_cpu_var(var) per_cpu__##var |
| 55 | #define per_cpu_init() (__phys_per_cpu_start) |
| 56 | |
| 57 | #endif /* SMP */ |
| 58 | |
| 59 | #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) |
| 60 | #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) |
| 61 | |
| 62 | /* |
| 63 | * Be extremely careful when taking the address of this variable! Due to virtual |
| 64 | * remapping, it is different from the canonical address returned by __get_cpu_var(var)! |
| 65 | * On the positive side, using __ia64_per_cpu_var() instead of __get_cpu_var() is slightly |
| 66 | * more efficient. |
| 67 | */ |
| 68 | #define __ia64_per_cpu_var(var) (per_cpu__##var) |
| 69 | |
| 70 | #endif /* !__ASSEMBLY__ */ |
| 71 | |
| 72 | #endif /* _ASM_IA64_PERCPU_H */ |