1#ifndef _ASM_HIGHMEM_H 2#define _ASM_HIGHMEM_H 3 4#include <asm/kmap_types.h> 5 6#define PKMAP_BASE (PAGE_OFFSET - PMD_SIZE) 7#define LAST_PKMAP PTRS_PER_PTE 8#define LAST_PKMAP_MASK (LAST_PKMAP - 1) 9#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) 10#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 11 12#define kmap_prot PAGE_KERNEL 13 14#define flush_cache_kmaps() \ 15 do { \ 16 if (cache_is_vivt()) \ 17 flush_cache_all(); \ 18 } while (0) 19 20extern pte_t *pkmap_page_table; 21 22#define ARCH_NEEDS_KMAP_HIGH_GET 23 24extern void *kmap_high(struct page *page); 25extern void *kmap_high_get(struct page *page); 26extern void kunmap_high(struct page *page); 27 28/* 29 * The following functions are already defined by <linux/highmem.h> 30 * when CONFIG_HIGHMEM is not set. 31 */ 32#ifdef CONFIG_HIGHMEM 33extern void *kmap(struct page *page); 34extern void kunmap(struct page *page); 35extern void *__kmap_atomic(struct page *page); 36extern void __kunmap_atomic(void *kvaddr); 37extern void *kmap_atomic_pfn(unsigned long pfn); 38extern struct page *kmap_atomic_to_page(const void *ptr); 39#endif 40 41#endif 42