| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * highmem.h: virtual kernel memory mappings for high memory |
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| 4 | * |
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| 5 | * Used in CONFIG_HIGHMEM systems for memory pages which |
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| 6 | * are not addressable by direct kernel virtual addresses. |
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| 7 | * |
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| 8 | * Copyright (C) 1999 Gerhard Wichert, Siemens AG |
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| 9 | * Gerhard.Wichert@pdb.siemens.de |
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| 10 | * |
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| 11 | * |
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| 12 | * Redesigned the x86 32-bit VM architecture to deal with |
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| 13 | * up to 16 Terabyte physical memory. With current x86 CPUs |
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| 14 | * we now support up to 64 Gigabytes physical RAM. |
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| 15 | * |
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| 16 | * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> |
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| 17 | */ |
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| 18 | |
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| 19 | #ifndef _ASM_X86_HIGHMEM_H |
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| 20 | #define _ASM_X86_HIGHMEM_H |
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| 21 | |
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| 22 | #ifdef __KERNEL__ |
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| 23 | |
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| 24 | #include <linux/interrupt.h> |
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| 25 | #include <linux/threads.h> |
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| 26 | #include <asm/tlbflush.h> |
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| 27 | #include <asm/paravirt.h> |
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| 28 | #include <asm/fixmap.h> |
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| 29 | #include <asm/pgtable_areas.h> |
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| 30 | |
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| 31 | /* declarations for highmem.c */ |
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| 32 | extern unsigned long highstart_pfn, highend_pfn; |
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| 33 | |
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| 34 | /* |
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| 35 | * Right now we initialize only a single pte table. It can be extended |
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| 36 | * easily, subsequent pte tables have to be allocated in one physical |
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| 37 | * chunk of RAM. |
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| 38 | */ |
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| 39 | /* |
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| 40 | * Ordering is: |
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| 41 | * |
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| 42 | * high memory on: high_memory off: |
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| 43 | * FIXADDR_TOP FIXADDR_TOP |
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| 44 | * fixed addresses fixed addresses |
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| 45 | * FIXADDR_START FIXADDR_START |
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| 46 | * temp fixed addresses/persistent kmap area VMALLOC_END |
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| 47 | * PKMAP_BASE temp fixed addresses/vmalloc area |
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| 48 | * VMALLOC_END VMALLOC_START |
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| 49 | * vmalloc area high_memory |
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| 50 | * VMALLOC_START |
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| 51 | * high_memory |
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| 52 | * |
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| 53 | * The temp fixed area is only used during boot for early_ioremap(), and |
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| 54 | * it is unused when the ioremap() is functional. vmalloc/pkmap area become |
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| 55 | * available after early boot so the temp fixed area is available for re-use. |
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| 56 | */ |
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| 57 | #define LAST_PKMAP_MASK (LAST_PKMAP-1) |
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| 58 | #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) |
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| 59 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) |
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| 60 | |
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| 61 | #define flush_cache_kmaps() do { } while (0) |
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| 62 | |
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| 63 | #define arch_kmap_local_post_map(vaddr, pteval) \ |
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| 64 | arch_flush_lazy_mmu_mode() |
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| 65 | |
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| 66 | #define arch_kmap_local_post_unmap(vaddr) \ |
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| 67 | do { \ |
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| 68 | flush_tlb_one_kernel((vaddr)); \ |
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| 69 | arch_flush_lazy_mmu_mode(); \ |
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| 70 | } while (0) |
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| 71 | |
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| 72 | extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn, |
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| 73 | unsigned long end_pfn); |
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| 74 | |
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| 75 | #endif /* __KERNEL__ */ |
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| 76 | |
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| 77 | #endif /* _ASM_X86_HIGHMEM_H */ |
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| 78 | |
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