fixmap.h

 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