1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2384740dcSRalf Baechle /* 3384740dcSRalf Baechle * highmem.h: virtual kernel memory mappings for high memory 4384740dcSRalf Baechle * 5384740dcSRalf Baechle * Used in CONFIG_HIGHMEM systems for memory pages which 6384740dcSRalf Baechle * are not addressable by direct kernel virtual addresses. 7384740dcSRalf Baechle * 8384740dcSRalf Baechle * Copyright (C) 1999 Gerhard Wichert, Siemens AG 9384740dcSRalf Baechle * Gerhard.Wichert@pdb.siemens.de 10384740dcSRalf Baechle * 11384740dcSRalf Baechle * 12384740dcSRalf Baechle * Redesigned the x86 32-bit VM architecture to deal with 13384740dcSRalf Baechle * up to 16 Terabyte physical memory. With current x86 CPUs 14384740dcSRalf Baechle * we now support up to 64 Gigabytes physical RAM. 15384740dcSRalf Baechle * 16384740dcSRalf Baechle * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> 17384740dcSRalf Baechle */ 18384740dcSRalf Baechle #ifndef _ASM_HIGHMEM_H 19384740dcSRalf Baechle #define _ASM_HIGHMEM_H 20384740dcSRalf Baechle 21384740dcSRalf Baechle #ifdef __KERNEL__ 22384740dcSRalf Baechle 2334ae8e36SRalf Baechle #include <linux/bug.h> 24384740dcSRalf Baechle #include <linux/interrupt.h> 25384740dcSRalf Baechle #include <linux/uaccess.h> 2634ae8e36SRalf Baechle #include <asm/cpu-features.h> 27a4c33e83SThomas Gleixner #include <asm/kmap_size.h> 28384740dcSRalf Baechle 29384740dcSRalf Baechle /* declarations for highmem.c */ 30384740dcSRalf Baechle extern unsigned long highstart_pfn, highend_pfn; 31384740dcSRalf Baechle 32384740dcSRalf Baechle extern pte_t *pkmap_page_table; 33384740dcSRalf Baechle 34384740dcSRalf Baechle /* 35384740dcSRalf Baechle * Right now we initialize only a single pte table. It can be extended 36384740dcSRalf Baechle * easily, subsequent pte tables have to be allocated in one physical 37384740dcSRalf Baechle * chunk of RAM. 38384740dcSRalf Baechle */ 39*cf02ce74SWei Li #if defined(CONFIG_PHYS_ADDR_T_64BIT) || defined(CONFIG_MIPS_HUGE_TLB_SUPPORT) 40725a269bSMarcin Nowakowski #define LAST_PKMAP 512 41725a269bSMarcin Nowakowski #else 42384740dcSRalf Baechle #define LAST_PKMAP 1024 43725a269bSMarcin Nowakowski #endif 44725a269bSMarcin Nowakowski 45384740dcSRalf Baechle #define LAST_PKMAP_MASK (LAST_PKMAP-1) 46384740dcSRalf Baechle #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) 47384740dcSRalf Baechle #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 48384740dcSRalf Baechle 49525aaf9bSIra Weiny #define ARCH_HAS_KMAP_FLUSH_TLB 50525aaf9bSIra Weiny extern void kmap_flush_tlb(unsigned long addr); 51384740dcSRalf Baechle 5234ae8e36SRalf Baechle #define flush_cache_kmaps() BUG_ON(cpu_has_dc_aliases) 53384740dcSRalf Baechle 548c0d5d78SThomas Gleixner #define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev) set_pte(ptep, ptev) 55a4c33e83SThomas Gleixner #define arch_kmap_local_post_map(vaddr, pteval) local_flush_tlb_one(vaddr) 56a4c33e83SThomas Gleixner #define arch_kmap_local_post_unmap(vaddr) local_flush_tlb_one(vaddr) 57bb86bf28SRalf Baechle 58384740dcSRalf Baechle #endif /* __KERNEL__ */ 59384740dcSRalf Baechle 60384740dcSRalf Baechle #endif /* _ASM_HIGHMEM_H */ 61