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