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To support kmap_atomic_prot(), all architectures need to support protections passed to their kmap_atomic_high() function. Pass protections into kmap_atomic_high() and change the name to kmap_atomic_high_prot() to match. Then define kmap_atomic_prot() as a core function which calls kmap_atomic_high_prot() when needed. Finally, redefine kmap_atomic() as a wrapper of kmap_atomic_prot() with the default kmap_prot exported by the architectures. Signed-off-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Christian König <christian.koenig@amd.com> Cc: Chris Zankel <chris@zankel.net> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Helge Deller <deller@gmx.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20200507150004.1423069-11-ira.weiny@intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
72 lines
2.3 KiB
C
72 lines
2.3 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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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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