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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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
20extern pte_t *pkmap_page_table;
21
22#define ARCH_NEEDS_KMAP_HIGH_GET
23
24extern void *kmap_high(struct page *page);
25extern void *kmap_high_get(struct page *page);
26extern void kunmap_high(struct page *page);
27
28extern void *kmap_high_l1_vipt(struct page *page, pte_t *saved_pte);
29extern 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
36extern void *kmap(struct page *page);
37extern void kunmap(struct page *page);
38extern void *kmap_atomic(struct page *page, enum km_type type);
39extern void kunmap_atomic_notypecheck(void *kvaddr, enum km_type type);
40extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);
41extern struct page *kmap_atomic_to_page(const void *ptr);
42#endif
43
44#endif