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 20 extern pte_t *pkmap_page_table; 21 22 #define ARCH_NEEDS_KMAP_HIGH_GET 23 24 extern void *kmap_high(struct page *page); 25 extern void *kmap_high_get(struct page *page); 26 extern void kunmap_high(struct page *page); 27 28 extern void *kmap_high_l1_vipt(struct page *page, pte_t *saved_pte); 29 extern void kunmap_high_l1_vipt(struct page *page, pte_t saved_pte); 30 31 /* 32 * The following functions are already defined by <linux/highmem.h> 33 * when CONFIG_HIGHMEM is not set. 34 */ 35 #ifdef CONFIG_HIGHMEM 36 extern void *kmap(struct page *page); 37 extern void kunmap(struct page *page); 38 extern void *kmap_atomic(struct page *page, enum km_type type); 39 extern void kunmap_atomic(void *kvaddr, enum km_type type); 40 extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type); 41 extern struct page *kmap_atomic_to_page(const void *ptr); 42 #endif 43 44 #endif 45