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Diffstat (limited to 'linux/arch/tile/include/asm/fixmap.h')
| -rw-r--r-- | linux/arch/tile/include/asm/fixmap.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/linux/arch/tile/include/asm/fixmap.h b/linux/arch/tile/include/asm/fixmap.h new file mode 100644 index 00000000..ffe2637a --- /dev/null +++ b/linux/arch/tile/include/asm/fixmap.h @@ -0,0 +1,87 @@ +/* + * Copyright (C) 1998 Ingo Molnar + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#ifndef _ASM_TILE_FIXMAP_H +#define _ASM_TILE_FIXMAP_H + +#include <asm/page.h> + +#ifndef __ASSEMBLY__ +#include <linux/kernel.h> +#ifdef CONFIG_HIGHMEM +#include <linux/threads.h> +#include <asm/kmap_types.h> +#endif + +/* + * Here we define all the compile-time 'special' virtual + * addresses. The point is to have a constant address at + * compile time, but to set the physical address only + * in the boot process. We allocate these special addresses + * from the end of supervisor virtual memory backwards. + * Also this lets us do fail-safe vmalloc(), we + * can guarantee that these special addresses and + * vmalloc()-ed addresses never overlap. + * + * these 'compile-time allocated' memory buffers are + * fixed-size 4k pages. (or larger if used with an increment + * higher than 1) use fixmap_set(idx,phys) to associate + * physical memory with fixmap indices. + * + * TLB entries of such buffers will not be flushed across + * task switches. + */ +enum fixed_addresses { +#ifdef __tilegx__ + /* + * TILEPro has unmapped memory above so the hole isn't needed, + * and in any case the hole pushes us over a single 16MB pmd. + */ + FIX_HOLE, +#endif +#ifdef CONFIG_HIGHMEM + FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ + FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, +#endif +#ifdef __tilegx__ /* see homecache.c */ + FIX_HOMECACHE_BEGIN, + FIX_HOMECACHE_END = FIX_HOMECACHE_BEGIN+(NR_CPUS)-1, +#endif + __end_of_permanent_fixed_addresses, + + /* + * Temporary boot-time mappings, used before ioremap() is functional. + * Not currently needed by the Tile architecture. + */ +#define NR_FIX_BTMAPS 0 +#if NR_FIX_BTMAPS + FIX_BTMAP_END = __end_of_permanent_fixed_addresses, + FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS - 1, + __end_of_fixed_addresses +#else + __end_of_fixed_addresses = __end_of_permanent_fixed_addresses +#endif +}; + +#define __FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) +#define __FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) +#define FIXADDR_START (FIXADDR_TOP + PAGE_SIZE - __FIXADDR_SIZE) +#define FIXADDR_BOOT_START (FIXADDR_TOP + PAGE_SIZE - __FIXADDR_BOOT_SIZE) + +#include <asm-generic/fixmap.h> + +#endif /* !__ASSEMBLY__ */ + +#endif /* _ASM_TILE_FIXMAP_H */ |