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System | : | Linux MiraNet 3.0.0-14-generic-pae #23-Ubuntu SMP Mon Nov 21 22:07:10 UTC 2011 i686 |
Software | : | Apache. PHP/5.3.6-13ubuntu3.10 |
ID | : | uid=65534(nobody) gid=65534(nogroup) groups=65534(nogroup)
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/
usr/
src/
linux-headers-3.0.0-14/
arch/
arm/
include/
asm/
- drwxr-xr-x
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Viewing file: highmem.h (2.03 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
#ifndef _ASM_HIGHMEM_H #define _ASM_HIGHMEM_H
#include <asm/kmap_types.h>
#define PKMAP_BASE (PAGE_OFFSET - PMD_SIZE) #define LAST_PKMAP PTRS_PER_PTE #define LAST_PKMAP_MASK (LAST_PKMAP - 1) #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
#define kmap_prot PAGE_KERNEL
#define flush_cache_kmaps() \ do { \ if (cache_is_vivt()) \ flush_cache_all(); \ } while (0)
extern pte_t *pkmap_page_table;
extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page);
/* * The reason for kmap_high_get() is to ensure that the currently kmap'd * page usage count does not decrease to zero while we're using its * existing virtual mapping in an atomic context. With a VIVT cache this * is essential to do, but with a VIPT cache this is only an optimization * so not to pay the price of establishing a second mapping if an existing * one can be used. However, on platforms without hardware TLB maintenance * broadcast, we simply cannot use ARCH_NEEDS_KMAP_HIGH_GET at all since * the locking involved must also disable IRQs which is incompatible with * the IPI mechanism used by global TLB operations. */ #define ARCH_NEEDS_KMAP_HIGH_GET #if defined(CONFIG_SMP) && defined(CONFIG_CPU_TLB_V6) #undef ARCH_NEEDS_KMAP_HIGH_GET #if defined(CONFIG_HIGHMEM) && defined(CONFIG_CPU_CACHE_VIVT) #error "The sum of features in your kernel config cannot be supported together" #endif #endif
#ifdef ARCH_NEEDS_KMAP_HIGH_GET extern void *kmap_high_get(struct page *page); #else static inline void *kmap_high_get(struct page *page) { return NULL; } #endif
/* * The following functions are already defined by <linux/highmem.h> * when CONFIG_HIGHMEM is not set. */ #ifdef CONFIG_HIGHMEM extern void *kmap(struct page *page); extern void kunmap(struct page *page); extern void *__kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); extern struct page *kmap_atomic_to_page(const void *ptr); #endif
#endif
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