1 /* SPDX-License-Identifier: GPL-2.0 */ 1 2 /* 3 * highmem.h: virtual kernel memory mappings f 4 * 5 * Used in CONFIG_HIGHMEM systems for memory p 6 * are not addressable by direct kernel virtua 7 * 8 * Copyright (C) 1999 Gerhard Wichert, Siemens 9 * Gerhard.Wichert@pdb.siem 10 * 11 * 12 * Redesigned the x86 32-bit VM architecture t 13 * up to 16 Terrabyte physical memory. With cu 14 * we now support up to 64 Gigabytes physical 15 * 16 * Copyright (C) 1999 Ingo Molnar <mingo@redha 17 */ 18 19 #ifndef _ASM_HIGHMEM_H 20 #define _ASM_HIGHMEM_H 21 22 #ifdef __KERNEL__ 23 24 #include <linux/interrupt.h> 25 #include <linux/pgtable.h> 26 #include <asm/vaddrs.h> 27 #include <asm/pgtsrmmu.h> 28 29 /* declarations for highmem.c */ 30 extern unsigned long highstart_pfn, highend_pf 31 32 #define kmap_prot __pgprot(SRMMU_ET_PTE | SRMM 33 extern pte_t *pkmap_page_table; 34 35 /* 36 * Right now we initialize only a single pte t 37 * easily, subsequent pte tables have to be al 38 * chunk of RAM. Currently the simplest way t 39 * pkmap region on a pagetable boundary (4MB). 40 */ 41 #define LAST_PKMAP 1024 42 #define PKMAP_SIZE (LAST_PKMAP << PAGE_SHIFT) 43 #define PKMAP_BASE PMD_ALIGN(SRMMU_NOCACHE_VAD 44 45 #define LAST_PKMAP_MASK (LAST_PKMAP - 1) 46 #define PKMAP_NR(virt) ((virt - PKMAP_BASE) > 47 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << 48 49 #define PKMAP_END (PKMAP_ADDR(LAST_PKMAP)) 50 51 #define flush_cache_kmaps() flush_cache_al 52 53 /* FIXME: Use __flush_*_one(vaddr) instead of 54 #define arch_kmap_local_pre_map(vaddr, pteval) 55 #define arch_kmap_local_pre_unmap(vaddr) 56 #define arch_kmap_local_post_map(vaddr, pteval 57 #define arch_kmap_local_post_unmap(vaddr) 58 59 #endif /* __KERNEL__ */ 60 61 #endif /* _ASM_HIGHMEM_H */ 62
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