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/* 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 * [email protected] * * * Redesigned the x86 32-bit VM architecture to deal with * up to 16 Terrabyte physical memory. With current x86 CPUs * we now support up to 64 Gigabytes physical RAM. * * Copyright (C) 1999 Ingo Molnar <[email protected]> */ #ifndef _ASM_HIGHMEM_H #define _ASM_HIGHMEM_H #ifdef __KERNEL__ #include <linux/interrupt.h> #include <linux/pgtable.h> #include <asm/vaddrs.h> #include <asm/pgtsrmmu.h> /* declarations for highmem.c */ extern unsigned long highstart_pfn, highend_pfn; #define kmap_prot __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE) 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. Currently the simplest way to do this is to align the * pkmap region on a pagetable boundary (4MB). */ #define LAST_PKMAP 1024 #define PKMAP_SIZE (LAST_PKMAP << PAGE_SHIFT) #define PKMAP_BASE PMD_ALIGN(SRMMU_NOCACHE_VADDR + (SRMMU_MAX_NOCACHE_PAGES << PAGE_SHIFT)) #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)) #define PKMAP_END (PKMAP_ADDR(LAST_PKMAP)) #define flush_cache_kmaps() flush_cache_all() /* FIXME: Use __flush_*_one(vaddr) instead of flush_*_all() -- Anton */ #define arch_kmap_local_pre_map(vaddr, pteval) flush_cache_all() #define arch_kmap_local_pre_unmap(vaddr) flush_cache_all() #define arch_kmap_local_post_map(vaddr, pteval) flush_tlb_all() #define arch_kmap_local_post_unmap(vaddr) flush_tlb_all() #endif /* __KERNEL__ */ #endif /* _ASM_HIGHMEM_H */