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76 lines
2.4 KiB
76 lines
2.4 KiB
/* 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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* [email protected] |
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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 <[email protected]> |
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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/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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#define flush_cache_kmaps() do { } while (0) |
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#define arch_kmap_local_post_map(vaddr, pteval) \ |
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arch_flush_lazy_mmu_mode() |
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#define arch_kmap_local_post_unmap(vaddr) \ |
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do { \ |
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flush_tlb_one_kernel((vaddr)); \ |
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arch_flush_lazy_mmu_mode(); \ |
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} 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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