arch/tile/include/asm/fixmap.h

/*
 * 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 */