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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 <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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 */ | ||
|
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| #ifndef _ASM_FIXMAP_H | ||
| #define _ASM_FIXMAP_H | ||
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| #include <linux/kernel.h> | ||
| #include <asm/page.h> | ||
| #ifdef CONFIG_HIGHMEM | ||
| #include <linux/threads.h> | ||
| #include <asm/kmap_types.h> | ||
| #endif | ||
|
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||
| /* | ||
| * 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. | ||
| */ | ||
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||
| /* | ||
| * 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 | ||
| }; | ||
|
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| extern void __set_fixmap (enum fixed_addresses idx, | ||
| unsigned long phys, pgprot_t flags); | ||
|
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| #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) | ||
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| #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | ||
| #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | ||
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| extern void __this_fixmap_does_not_exist(void); | ||
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| /* | ||
| * '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(); | ||
|
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| return __fix_to_virt(idx); | ||
| } | ||
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| static inline unsigned long virt_to_fix(const unsigned long vaddr) | ||
| { | ||
| BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | ||
| return __virt_to_fix(vaddr); | ||
| } | ||
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| #endif |