mirror of https://gitee.com/openkylin/linux.git
81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* highmem.h: virtual kernel memory mappings for high memory
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*
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* Used in CONFIG_HIGHMEM systems for memory pages which
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* are not addressable by direct kernel virtual addresses.
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*
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* Copyright (C) 1999 Gerhard Wichert, Siemens AG
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* Gerhard.Wichert@pdb.siemens.de
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*
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*
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* Redesigned the x86 32-bit VM architecture to deal with
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* up to 16 Terabyte physical memory. With current x86 CPUs
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* we now support up to 64 Gigabytes physical RAM.
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*
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* Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
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*/
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#ifndef _ASM_X86_HIGHMEM_H
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#define _ASM_X86_HIGHMEM_H
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#ifdef __KERNEL__
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#include <linux/interrupt.h>
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#include <linux/threads.h>
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#include <asm/kmap_types.h>
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#include <asm/tlbflush.h>
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#include <asm/paravirt.h>
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#include <asm/fixmap.h>
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/* declarations for highmem.c */
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extern unsigned long highstart_pfn, highend_pfn;
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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:
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*
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* high memory on: high_memory off:
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* FIXADDR_TOP FIXADDR_TOP
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* fixed addresses fixed addresses
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* FIXADDR_START FIXADDR_START
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* temp fixed addresses/persistent kmap area VMALLOC_END
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* PKMAP_BASE temp fixed addresses/vmalloc area
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* VMALLOC_END VMALLOC_START
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* vmalloc area high_memory
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* VMALLOC_START
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* high_memory
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*
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* The temp fixed area is only used during boot for early_ioremap(), and
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* it is unused when the ioremap() is functional. vmalloc/pkmap area become
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* available after early boot so the temp fixed area is available for re-use.
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*/
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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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extern void *kmap_high(struct page *page);
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extern void kunmap_high(struct page *page);
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void *kmap(struct page *page);
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void kunmap(struct page *page);
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void *kmap_atomic_prot(struct page *page, pgprot_t prot);
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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_atomic_pfn(unsigned long pfn);
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void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);
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#define flush_cache_kmaps() do { } while (0)
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extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
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unsigned long end_pfn);
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_HIGHMEM_H */
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