| /* | |
| * 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 | |
| * Gerhard.Wichert@pdb.siemens.de | |
| * | |
| * | |
| * Redesigned the x86 32-bit VM architecture to deal with | |
| * up to 16 Terabyte physical memory. With current x86 CPUs | |
| * we now support up to 64 Gigabytes physical RAM. | |
| * | |
| * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> | |
| */ | |
| #ifndef _ASM_HIGHMEM_H | |
| #define _ASM_HIGHMEM_H | |
| #ifdef __KERNEL__ | |
| #include <linux/bug.h> | |
| #include <linux/interrupt.h> | |
| #include <linux/uaccess.h> | |
| #include <asm/cpu-features.h> | |
| #include <asm/kmap_types.h> | |
| /* undef for production */ | |
| #define HIGHMEM_DEBUG 1 | |
| /* declarations for highmem.c */ | |
| extern unsigned long highstart_pfn, highend_pfn; | |
| 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. | |
| */ | |
| #define LAST_PKMAP 1024 | |
| #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)) | |
| extern void * kmap_high(struct page *page); | |
| extern void kunmap_high(struct page *page); | |
| extern void *kmap(struct page *page); | |
| extern void kunmap(struct page *page); | |
| extern void *kmap_atomic(struct page *page); | |
| extern void __kunmap_atomic(void *kvaddr); | |
| extern void *kmap_atomic_pfn(unsigned long pfn); | |
| #define flush_cache_kmaps() BUG_ON(cpu_has_dc_aliases) | |
| extern void kmap_init(void); | |
| #define kmap_prot PAGE_KERNEL | |
| #endif /* __KERNEL__ */ | |
| #endif /* _ASM_HIGHMEM_H */ |