This source file includes following definitions.
- kmap
- kunmap
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19 #ifndef _ASM_HIGHMEM_H
20 #define _ASM_HIGHMEM_H
21
22 #ifdef __KERNEL__
23
24 #include <linux/interrupt.h>
25 #include <asm/vaddrs.h>
26 #include <asm/kmap_types.h>
27 #include <asm/pgtable.h>
28
29
30 extern unsigned long highstart_pfn, highend_pfn;
31
32 extern pgprot_t kmap_prot;
33 extern pte_t *pkmap_page_table;
34
35 void kmap_init(void) __init;
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41
42
43 #define LAST_PKMAP 1024
44 #define PKMAP_SIZE (LAST_PKMAP << PAGE_SHIFT)
45 #define PKMAP_BASE PMD_ALIGN(SRMMU_NOCACHE_VADDR + (SRMMU_MAX_NOCACHE_PAGES << PAGE_SHIFT))
46
47 #define LAST_PKMAP_MASK (LAST_PKMAP - 1)
48 #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
49 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
50
51 #define PKMAP_END (PKMAP_ADDR(LAST_PKMAP))
52
53 void *kmap_high(struct page *page);
54 void kunmap_high(struct page *page);
55
56 static inline void *kmap(struct page *page)
57 {
58 BUG_ON(in_interrupt());
59 if (!PageHighMem(page))
60 return page_address(page);
61 return kmap_high(page);
62 }
63
64 static inline void kunmap(struct page *page)
65 {
66 BUG_ON(in_interrupt());
67 if (!PageHighMem(page))
68 return;
69 kunmap_high(page);
70 }
71
72 void *kmap_atomic(struct page *page);
73 void __kunmap_atomic(void *kvaddr);
74
75 #define flush_cache_kmaps() flush_cache_all()
76
77 #endif
78
79 #endif