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61 lines
1.9 KiB
61 lines
1.9 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 Terrabyte 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_HIGHMEM_H |
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#define _ASM_HIGHMEM_H |
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#ifdef __KERNEL__ |
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#include <linux/interrupt.h> |
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#include <linux/pgtable.h> |
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#include <asm/vaddrs.h> |
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#include <asm/pgtsrmmu.h> |
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/* declarations for highmem.c */ |
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extern unsigned long highstart_pfn, highend_pfn; |
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#define kmap_prot __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE) |
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extern pte_t *pkmap_page_table; |
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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. Currently the simplest way to do this is to align the |
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* pkmap region on a pagetable boundary (4MB). |
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*/ |
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#define LAST_PKMAP 1024 |
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#define PKMAP_SIZE (LAST_PKMAP << PAGE_SHIFT) |
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#define PKMAP_BASE PMD_ALIGN(SRMMU_NOCACHE_VADDR + (SRMMU_MAX_NOCACHE_PAGES << PAGE_SHIFT)) |
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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 PKMAP_END (PKMAP_ADDR(LAST_PKMAP)) |
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#define flush_cache_kmaps() flush_cache_all() |
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/* FIXME: Use __flush_*_one(vaddr) instead of flush_*_all() -- Anton */ |
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#define arch_kmap_local_pre_map(vaddr, pteval) flush_cache_all() |
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#define arch_kmap_local_pre_unmap(vaddr) flush_cache_all() |
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#define arch_kmap_local_post_map(vaddr, pteval) flush_tlb_all() |
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#define arch_kmap_local_post_unmap(vaddr) flush_tlb_all() |
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#endif /* __KERNEL__ */ |
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#endif /* _ASM_HIGHMEM_H */
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