6555910065
Introduce fixmap area just below the vmalloc region. Use it for atomic mapping of high memory pages. High memory on cores with cache aliasing is not supported and is still to be implemented. Fail build for such configurations for now. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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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