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sparc32: fixmap.h cleanup

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Remove all unused stuff from fixmap.h
It is only used for highmem - sparc32 has no fixmap support.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sam Ravnborg 2012-07-26 11:02:18 +00:00 committed by David S. Miller
parent 5bbeed12bd
commit c00db32122
1 changed files with 5 additions and 89 deletions
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94
arch/sparc/include/asm/fixmap.h
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@ -1,110 +1,26 @@
/* /* 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