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(). */
22 enum 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
39
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