fixmap.h (1106B)
1/* 2 * fixmap.h: compile-time virtual memory allocation 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 1998 Ingo Molnar 9 * 10 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 11 */ 12 13#ifndef _ASM_FIXMAP_H 14#define _ASM_FIXMAP_H 15 16#ifdef CONFIG_HIGHMEM 17#include <linux/threads.h> 18#include <linux/pgtable.h> 19#include <asm/kmap_size.h> 20 21/* The map slots for temporary mappings via kmap_atomic/local(). */ 22enum fixed_addresses { 23 FIX_KMAP_BEGIN, 24 FIX_KMAP_END = FIX_KMAP_BEGIN + 25 (KM_MAX_IDX * NR_CPUS * DCACHE_N_COLORS) - 1, 26 __end_of_fixed_addresses 27}; 28 29#define FIXADDR_END (XCHAL_KSEG_CACHED_VADDR - PAGE_SIZE) 30#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 31/* Enforce that FIXADDR_START is PMD aligned to handle cache aliasing */ 32#define FIXADDR_START ((FIXADDR_END - FIXADDR_SIZE) & PMD_MASK) 33#define FIXADDR_TOP (FIXADDR_START + FIXADDR_SIZE - PAGE_SIZE) 34 35#include <asm-generic/fixmap.h> 36 37#endif /* CONFIG_HIGHMEM */ 38#endif