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18 #ifndef _ASM_HIGHMEM_H
19 #define _ASM_HIGHMEM_H
20
21 #ifdef __KERNEL__
22
23 #include <linux/bug.h>
24 #include <linux/interrupt.h>
25 #include <linux/uaccess.h>
26 #include <asm/cpu-features.h>
27 #include <asm/kmap_types.h>
28
29
30 extern unsigned long highstart_pfn, highend_pfn;
31
32 extern pte_t *pkmap_page_table;
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38
39 #ifdef CONFIG_PHYS_ADDR_T_64BIT
40 #define LAST_PKMAP 512
41 #else
42 #define LAST_PKMAP 1024
43 #endif
44
45 #define LAST_PKMAP_MASK (LAST_PKMAP-1)
46 #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
47 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
48
49 extern void * kmap_high(struct page *page);
50 extern void kunmap_high(struct page *page);
51
52 extern void *kmap(struct page *page);
53 extern void kunmap(struct page *page);
54 extern void *kmap_atomic(struct page *page);
55 extern void __kunmap_atomic(void *kvaddr);
56 extern void *kmap_atomic_pfn(unsigned long pfn);
57
58 #define flush_cache_kmaps() BUG_ON(cpu_has_dc_aliases)
59
60 extern void kmap_init(void);
61
62 #define kmap_prot PAGE_KERNEL
63
64 #endif
65
66 #endif