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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | /* |
| 3 | * highmem.h: virtual kernel memory mappings for high memory |
| 4 | * |
| 5 | * Used in CONFIG_HIGHMEM systems for memory pages which |
| 6 | * are not addressable by direct kernel virtual addresses. |
| 7 | * |
| 8 | * Copyright (C) 1999 Gerhard Wichert, Siemens AG |
| 9 | * Gerhard.Wichert@pdb.siemens.de |
| 10 | * |
| 11 | * |
| 12 | * Redesigned the x86 32-bit VM architecture to deal with |
| 13 | * up to 16 Terabyte physical memory. With current x86 CPUs |
| 14 | * we now support up to 64 Gigabytes physical RAM. |
| 15 | * |
| 16 | * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> |
| 17 | */ |
| 18 | #ifndef _ASM_HIGHMEM_H |
| 19 | #define _ASM_HIGHMEM_H |
| 20 | |
| 21 | #ifdef __KERNEL__ |
| 22 | |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/uaccess.h> |
| 26 | #include <asm/fixmap.h> |
| 27 | |
| 28 | extern pte_t *pkmap_page_table; |
| 29 | |
| 30 | /* |
| 31 | * Right now we initialize only a single pte table. It can be extended |
| 32 | * easily, subsequent pte tables have to be allocated in one physical |
| 33 | * chunk of RAM. |
| 34 | */ |
| 35 | /* |
| 36 | * We use one full pte table with 4K pages. And with 16K/64K/256K pages pte |
| 37 | * table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP |
| 38 | * and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP |
| 39 | * in case of 16K/64K/256K page sizes. |
| 40 | */ |
| 41 | |
| 42 | #define PKMAP_ORDER PTE_SHIFT |
| 43 | #define LAST_PKMAP (1 << PKMAP_ORDER) |
| 44 | |
| 45 | #define PKMAP_BASE ((FIXADDR_START - PAGE_SIZE * (LAST_PKMAP + 1)) \ |
| 46 | & PMD_MASK) |
| 47 | |
| 48 | #define LAST_PKMAP_MASK (LAST_PKMAP - 1) |
| 49 | #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) |
| 50 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) |
| 51 | |
| 52 | #define flush_cache_kmaps() { flush_icache(); flush_dcache(); } |
| 53 | |
| 54 | #define arch_kmap_local_post_map(vaddr, pteval) \ |
| 55 | local_flush_tlb_page(NULL, vaddr); |
| 56 | #define arch_kmap_local_post_unmap(vaddr) \ |
| 57 | local_flush_tlb_page(NULL, vaddr); |
| 58 | |
| 59 | #endif /* __KERNEL__ */ |
| 60 | |
| 61 | #endif /* _ASM_HIGHMEM_H */ |
| 62 |
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