4 #include <asm/cacheflush.h>
5 #include <asm/kmap_types.h>
6 #include <asm/fixmap.h>
9 * Right now we initialize only a single pte table. It can be extended
10 * easily, subsequent pte tables have to be allocated in one physical
14 * Ordering is (from lower to higher memory addresses):
17 * Persistent kmap area
26 #define PKMAP_BASE (FIXADDR_START - PMD_SIZE)
27 #define LAST_PKMAP PTRS_PER_PTE
28 #define LAST_PKMAP_MASK (LAST_PKMAP - 1)
29 #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
30 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
32 #define kmap_prot PAGE_KERNEL
34 static inline void flush_cache_kmaps(void)
39 /* declarations for highmem.c */
40 extern unsigned long highstart_pfn, highend_pfn;
42 extern pte_t *pkmap_page_table;
44 extern void *kmap_high(struct page *page);
45 extern void kunmap_high(struct page *page);
47 extern void kmap_init(void);
50 * The following functions are already defined by <linux/highmem.h>
51 * when CONFIG_HIGHMEM is not set.
54 extern void *kmap(struct page *page);
55 extern void kunmap(struct page *page);
56 extern void *kmap_atomic(struct page *page);
57 extern void __kunmap_atomic(void *kvaddr);
58 extern void *kmap_atomic_pfn(unsigned long pfn);