45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
#ifndef _ASM_HIGHMEM_H
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#define _ASM_HIGHMEM_H
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#include <asm/kmap_types.h>
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#define PKMAP_BASE (PAGE_OFFSET - PMD_SIZE)
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#define LAST_PKMAP PTRS_PER_PTE
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#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
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#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
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#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
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#define kmap_prot PAGE_KERNEL
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#define flush_cache_kmaps() \
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do { \
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if (cache_is_vivt()) \
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flush_cache_all(); \
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} while (0)
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extern pte_t *pkmap_page_table;
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#define ARCH_NEEDS_KMAP_HIGH_GET
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extern void *kmap_high(struct page *page);
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extern void *kmap_high_get(struct page *page);
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extern void kunmap_high(struct page *page);
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extern void *kmap_high_l1_vipt(struct page *page, pte_t *saved_pte);
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extern void kunmap_high_l1_vipt(struct page *page, pte_t saved_pte);
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/*
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* The following functions are already defined by <linux/highmem.h>
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* when CONFIG_HIGHMEM is not set.
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*/
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#ifdef CONFIG_HIGHMEM
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extern void *kmap(struct page *page);
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extern void kunmap(struct page *page);
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extern void *kmap_atomic(struct page *page, enum km_type type);
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extern void kunmap_atomic(void *kvaddr, enum km_type type);
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extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);
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extern struct page *kmap_atomic_to_page(const void *ptr);
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#endif
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#endif
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