60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/*
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* include/asm-xtensa/highmem.h
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of
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* this archive for more details.
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*
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* Copyright (C) 2003 - 2005 Tensilica Inc.
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* Copyright (C) 2014 Cadence Design Systems Inc.
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*/
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#ifndef _XTENSA_HIGHMEM_H
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#define _XTENSA_HIGHMEM_H
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#include <asm/cacheflush.h>
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#include <asm/fixmap.h>
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#include <asm/kmap_types.h>
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#include <asm/pgtable.h>
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#define PKMAP_BASE (FIXADDR_START - 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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extern pte_t *pkmap_page_table;
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void *kmap_high(struct page *page);
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void kunmap_high(struct page *page);
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static inline void *kmap(struct page *page)
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{
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BUG_ON(in_interrupt());
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if (!PageHighMem(page))
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return page_address(page);
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return kmap_high(page);
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}
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static inline void kunmap(struct page *page)
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{
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BUG_ON(in_interrupt());
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if (!PageHighMem(page))
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return;
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kunmap_high(page);
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}
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static inline void flush_cache_kmaps(void)
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{
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flush_cache_all();
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}
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void *kmap_atomic(struct page *page);
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void __kunmap_atomic(void *kvaddr);
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void kmap_init(void);
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#endif
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