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 Terabyte physical memory. With cur 14 * we now support up to 64 Gigabytes physical 15 * 16 * Copyright (C) 1999 Ingo Molnar <mingo@redha 17 */ 18 #ifndef _ASM_HIGHMEM_H 19 #define _ASM_HIGHMEM_H 20 21 #ifdef __KERNEL__ 22 23 #include <linux/bug.h> 24 #include <linux/interrupt.h> 25 #include <linux/uaccess.h> 26 #include <asm/cpu-features.h> 27 #include <asm/kmap_size.h> 28 29 /* declarations for highmem.c */ 30 extern unsigned long highstart_pfn, highend_pf 31 32 extern pte_t *pkmap_page_table; 33 34 /* 35 * Right now we initialize only a single pte t 36 * easily, subsequent pte tables have to be al 37 * chunk of RAM. 38 */ 39 #if defined(CONFIG_PHYS_ADDR_T_64BIT) || defin 40 #define LAST_PKMAP 512 41 #else 42 #define LAST_PKMAP 1024 43 #endif 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 ARCH_HAS_KMAP_FLUSH_TLB 50 extern void kmap_flush_tlb(unsigned long addr) 51 52 #define flush_cache_kmaps() BUG_ON(cpu_has 53 54 #define arch_kmap_local_set_pte(mm, vaddr, pte 55 #define arch_kmap_local_post_map(vaddr, pteval 56 #define arch_kmap_local_post_unmap(vaddr) 57 58 #endif /* __KERNEL__ */ 59 60 #endif /* _ASM_HIGHMEM_H */ 61
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