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() flush_cache_all() 15 16 extern pte_t *pkmap_page_table; 17 18 #define ARCH_NEEDS_KMAP_HIGH_GET 19 20 extern void *kmap_high(struct page *page); 21 extern void *kmap_high_get(struct page *page); 22 extern void kunmap_high(struct page *page); 23 24 extern void *kmap(struct page *page); 25 extern void kunmap(struct page *page); 26 extern void *kmap_atomic(struct page *page, enum km_type type); 27 extern void kunmap_atomic(void *kvaddr, enum km_type type); 28 extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type); 29 extern struct page *kmap_atomic_to_page(const void *ptr); 30 31 #endif 32