sparc32: fixmap.h cleanup

/*

/* Highmem related constants */

 * fixmap.h: compile-time virtual memory allocation

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 1998 Ingo Molnar

 *

 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999

 */

#ifndef _ASM_FIXMAP_H

#ifndef _ASM_FIXMAP_H

#define _ASM_FIXMAP_H

#define _ASM_FIXMAP_H

#include <linux/kernel.h>

#include <asm/page.h>

#ifdef CONFIG_HIGHMEM

#include <linux/threads.h>

#include <asm/kmap_types.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 top of unused virtual memory (0xfd000000 - 1 page) 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

 * highger 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.

 */

/*

 * on UP currently we will have no trace of the fixmap mechanism,

 * no page table allocations, etc. This might change in the

 * future, say framebuffers for the console driver(s) could be

 * fix-mapped?

 */

enum fixed_addresses {

enum fixed_addresses {

	FIX_HOLE,

	FIX_HOLE,

#ifdef CONFIG_HIGHMEM

#ifdef CONFIG_HIGHMEM

	FIX_KMAP_BEGIN,

	FIX_KMAP_BEGIN,

	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,

	FIX_KMAP_END = (KM_TYPE_NR * NR_CPUS),

#endif

#endif

	__end_of_fixed_addresses

	__end_of_fixed_addresses

};

};

extern void __set_fixmap (enum fixed_addresses idx,

/* Leave one empty page between IO pages at 0xfd000000 and

					unsigned long phys, pgprot_t flags);

 * the top of the fixmap.

#define set_fixmap(idx, phys) \

		__set_fixmap(idx, phys, PAGE_KERNEL)

/*

 * Some hardware wants to get fixmapped without caching.

 */

#define set_fixmap_nocache(idx, phys) \

		__set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)

/*

 * used by vmalloc.c.

 *

 * Leave one empty page between IO pages at 0xfd000000 and

 * the start of the fixmap.

 */

 */

#define FIXADDR_TOP	(0xfcfff000UL)

#define FIXADDR_TOP	(0xfcfff000UL)

#define FIXADDR_SIZE	((__end_of_fixed_addresses) << PAGE_SHIFT)

#define FIXADDR_SIZE	((FIX_KMAP_END + 1) << PAGE_SHIFT)

#define FIXADDR_START	(FIXADDR_TOP - FIXADDR_SIZE)

#define FIXADDR_START	(FIXADDR_TOP - FIXADDR_SIZE)

#define __fix_to_virt(x)	(FIXADDR_TOP - ((x) << PAGE_SHIFT))

#define __fix_to_virt(x)	(FIXADDR_TOP - ((x) << PAGE_SHIFT))

#define __virt_to_fix(x)	((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)

extern void __this_fixmap_does_not_exist(void);

/*

 * 'index to address' translation. If anyone tries to use the idx

 * directly without tranlation, we catch the bug with a NULL-deference

 * kernel oops. Illegal ranges of incoming indices are caught too.

 */

static inline unsigned long fix_to_virt(const unsigned int idx)

{

	/*

	 * this branch gets completely eliminated after inlining,

	 * except when someone tries to use fixaddr indices in an

	 * illegal way. (such as mixing up address types or using

	 * out-of-range indices).

	 *

	 * If it doesn't get removed, the linker will complain

	 * loudly with a reasonably clear error message..

	 */

	if (idx >= __end_of_fixed_addresses)

		__this_fixmap_does_not_exist();

        return __fix_to_virt(idx);

}

static inline unsigned long virt_to_fix(const unsigned long vaddr)

{

	BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);

	return __virt_to_fix(vaddr);

}

#endif

#endif