66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#ifndef _ASM_HIGHMEM_H
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#define _ASM_HIGHMEM_H
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#include <asm/proc-fns.h>
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#include <asm/kmap_types.h>
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#include <asm/fixmap.h>
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#include <asm/pgtable.h>
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/*
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* Right now we initialize only a single pte table. It can be extended
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* easily, subsequent pte tables have to be allocated in one physical
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* chunk of RAM.
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*/
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/*
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* Ordering is (from lower to higher memory addresses):
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*
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* high_memory
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* Persistent kmap area
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* PKMAP_BASE
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* fixed_addresses
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* FIXADDR_START
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* FIXADDR_TOP
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* Vmalloc area
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* VMALLOC_START
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* VMALLOC_END
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*/
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#define PKMAP_BASE ((FIXADDR_START - PGDIR_SIZE) & (PGDIR_MASK))
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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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static inline void flush_cache_kmaps(void)
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{
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cpu_dcache_wbinval_all();
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}
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/* declarations for highmem.c */
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extern unsigned long highstart_pfn, highend_pfn;
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extern pte_t *pkmap_page_table;
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extern void *kmap_high(struct page *page);
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extern void kunmap_high(struct page *page);
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extern void kmap_init(void);
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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);
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extern void __kunmap_atomic(void *kvaddr);
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extern void *kmap_atomic_pfn(unsigned long pfn);
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extern struct page *kmap_atomic_to_page(void *ptr);
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#endif
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#endif
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