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author | Sam Ravnborg <sam@ravnborg.org> | 2012-07-26 13:02:18 +0200 |
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committer | David S. Miller <davem@davemloft.net> | 2012-07-27 01:46:16 +0200 |
commit | c00db32122e17120eb87d0f1f6723c1c4740fa78 (patch) | |
tree | 1bcb03dd6e5650eeddd308a3e513498dd981228c /arch/sparc | |
parent | sparc32: drop unused kmap_atomic_to_page (diff) | |
download | linux-c00db32122e17120eb87d0f1f6723c1c4740fa78.tar.xz linux-c00db32122e17120eb87d0f1f6723c1c4740fa78.zip |
sparc32: fixmap.h cleanup
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>
Diffstat (limited to 'arch/sparc')
-rw-r--r-- | arch/sparc/include/asm/fixmap.h | 94 |
1 files changed, 5 insertions, 89 deletions
diff --git a/arch/sparc/include/asm/fixmap.h b/arch/sparc/include/asm/fixmap.h index f18fc0755adf..0bdec9385a80 100644 --- a/arch/sparc/include/asm/fixmap.h +++ b/arch/sparc/include/asm/fixmap.h @@ -1,110 +1,26 @@ -/* - * 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 - */ +/* Highmem related constants */ #ifndef _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> -#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 { FIX_HOLE, #ifdef CONFIG_HIGHMEM FIX_KMAP_BEGIN, - FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, + FIX_KMAP_END = (KM_TYPE_NR * NR_CPUS), #endif __end_of_fixed_addresses }; -extern void __set_fixmap (enum fixed_addresses idx, - unsigned long phys, pgprot_t flags); - -#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. +/* Leave one empty page between IO pages at 0xfd000000 and + * the top of the fixmap. */ #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 __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 |