/* SPDX-License-Identifier: GPL-2.0 */ /* * highmem.h: virtual kernel memory mappings for high memory * * Used in CONFIG_HIGHMEM systems for memory pages which * are not addressable by direct kernel virtual addresses. * * Copyright (C) 1999 Gerhard Wichert, Siemens AG * Gerhard.Wichert@pdb.siemens.de * * * Redesigned the x86 32-bit VM architecture to deal with * up to 16 Terabyte physical memory. With current x86 CPUs * we now support up to 64 Gigabytes physical RAM. * * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> */ #ifndef _ASM_HIGHMEM_H #define _ASM_HIGHMEM_H #ifdef __KERNEL__ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/uaccess.h> #include <asm/fixmap.h> extern pte_t *kmap_pte; extern pgprot_t kmap_prot; extern pte_t *pkmap_page_table; /* * Right now we initialize only a single pte table. It can be extended * easily, subsequent pte tables have to be allocated in one physical * chunk of RAM. */ /* * We use one full pte table with 4K pages. And with 16K/64K/256K pages pte * table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP * and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP * in case of 16K/64K/256K page sizes. */ #define PKMAP_ORDER PTE_SHIFT #define LAST_PKMAP (1 << PKMAP_ORDER) #define PKMAP_BASE ((FIXADDR_START - PAGE_SIZE * (LAST_PKMAP + 1)) \ & PMD_MASK) #define LAST_PKMAP_MASK (LAST_PKMAP - 1) #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); extern void *kmap_atomic_prot(struct page *page, pgprot_t prot); extern void __kunmap_atomic(void *kvaddr); static inline void *kmap(struct page *page) { might_sleep(); if (!PageHighMem(page)) return page_address(page); return kmap_high(page); } static inline void kunmap(struct page *page) { BUG_ON(in_interrupt()); if (!PageHighMem(page)) return; kunmap_high(page); } static inline void *kmap_atomic(struct page *page) { return kmap_atomic_prot(page, kmap_prot); } #define flush_cache_kmaps() { flush_icache(); flush_dcache(); } #endif /* __KERNEL__ */ #endif /* _ASM_HIGHMEM_H */
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Kbuild | File | 742 B | 0644 |
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asm-compat.h | File | 518 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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atomic.h | File | 626 B | 0644 |
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cache.h | File | 644 B | 0644 |
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cacheflush.h | File | 4.12 KB | 0644 |
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checksum.h | File | 942 B | 0644 |
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cmpxchg.h | File | 919 B | 0644 |
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cpuinfo.h | File | 2.13 KB | 0644 |
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cputable.h | File | 1 B | 0644 |
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current.h | File | 850 B | 0644 |
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delay.h | File | 2.26 KB | 0644 |
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dma-mapping.h | File | 765 B | 0644 |
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dma.h | File | 706 B | 0644 |
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elf.h | File | 738 B | 0644 |
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entry.h | File | 1.13 KB | 0644 |
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exceptions.h | File | 2.08 KB | 0644 |
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fixmap.h | File | 1.96 KB | 0644 |
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flat.h | File | 2.26 KB | 0644 |
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ftrace.h | File | 641 B | 0644 |
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futex.h | File | 2.13 KB | 0644 |
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hash.h | File | 2.37 KB | 0644 |
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highmem.h | File | 2.2 KB | 0644 |
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hw_irq.h | File | 1 B | 0644 |
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io.h | File | 2.05 KB | 0644 |
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irq.h | File | 538 B | 0644 |
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irqflags.h | File | 2.6 KB | 0644 |
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kgdb.h | File | 739 B | 0644 |
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mmu.h | File | 4.19 KB | 0644 |
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mmu_context.h | File | 141 B | 0644 |
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mmu_context_mm.h | File | 3.91 KB | 0644 |
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module.h | File | 840 B | 0644 |
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page.h | File | 6.11 KB | 0644 |
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pci-bridge.h | File | 4.57 KB | 0644 |
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pci.h | File | 2.47 KB | 0644 |
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pgalloc.h | File | 4.74 KB | 0644 |
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pgtable.h | File | 17.66 KB | 0644 |
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processor.h | File | 4.11 KB | 0644 |
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prom.h | File | 713 B | 0644 |
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ptrace.h | File | 727 B | 0644 |
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pvr.h | File | 8.72 KB | 0644 |
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registers.h | File | 1.65 KB | 0644 |
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seccomp.h | File | 256 B | 0644 |
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sections.h | File | 637 B | 0644 |
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setup.h | File | 1.37 KB | 0644 |
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string.h | File | 630 B | 0644 |
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switch_to.h | File | 629 B | 0644 |
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syscall.h | File | 2.26 KB | 0644 |
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thread_info.h | File | 4.01 KB | 0644 |
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timex.h | File | 402 B | 0644 |
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tlb.h | File | 714 B | 0644 |
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tlbflush.h | File | 2.04 KB | 0644 |
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uaccess.h | File | 9.98 KB | 0644 |
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unaligned.h | File | 871 B | 0644 |
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unistd.h | File | 1.19 KB | 0644 |
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unwind.h | File | 719 B | 0644 |
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user.h | File | 1 B | 0644 |
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