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Diffstat (limited to 'include/asm-sparc/fixmap.h')
| -rw-r--r-- | include/asm-sparc/fixmap.h | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/include/asm-sparc/fixmap.h b/include/asm-sparc/fixmap.h deleted file mode 100644 index f18fc0755adf..000000000000 --- a/include/asm-sparc/fixmap.h +++ /dev/null | |||
| @@ -1,110 +0,0 @@ | |||
| 1 | /* | ||
| 2 | * fixmap.h: compile-time virtual memory allocation | ||
| 3 | * | ||
| 4 | * This file is subject to the terms and conditions of the GNU General Public | ||
| 5 | * License. See the file "COPYING" in the main directory of this archive | ||
| 6 | * for more details. | ||
| 7 | * | ||
| 8 | * Copyright (C) 1998 Ingo Molnar | ||
| 9 | * | ||
| 10 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | ||
| 11 | */ | ||
| 12 | |||
| 13 | #ifndef _ASM_FIXMAP_H | ||
| 14 | #define _ASM_FIXMAP_H | ||
| 15 | |||
| 16 | #include <linux/kernel.h> | ||
| 17 | #include <asm/page.h> | ||
| 18 | #ifdef CONFIG_HIGHMEM | ||
| 19 | #include <linux/threads.h> | ||
| 20 | #include <asm/kmap_types.h> | ||
| 21 | #endif | ||
| 22 | |||
| 23 | /* | ||
| 24 | * Here we define all the compile-time 'special' virtual | ||
| 25 | * addresses. The point is to have a constant address at | ||
| 26 | * compile time, but to set the physical address only | ||
| 27 | * in the boot process. We allocate these special addresses | ||
| 28 | * from the top of unused virtual memory (0xfd000000 - 1 page) backwards. | ||
| 29 | * Also this lets us do fail-safe vmalloc(), we | ||
| 30 | * can guarantee that these special addresses and | ||
| 31 | * vmalloc()-ed addresses never overlap. | ||
| 32 | * | ||
| 33 | * these 'compile-time allocated' memory buffers are | ||
| 34 | * fixed-size 4k pages. (or larger if used with an increment | ||
| 35 | * highger than 1) use fixmap_set(idx,phys) to associate | ||
| 36 | * physical memory with fixmap indices. | ||
| 37 | * | ||
| 38 | * TLB entries of such buffers will not be flushed across | ||
| 39 | * task switches. | ||
| 40 | */ | ||
| 41 | |||
| 42 | /* | ||
| 43 | * on UP currently we will have no trace of the fixmap mechanism, | ||
| 44 | * no page table allocations, etc. This might change in the | ||
| 45 | * future, say framebuffers for the console driver(s) could be | ||
| 46 | * fix-mapped? | ||
| 47 | */ | ||
| 48 | enum fixed_addresses { | ||
| 49 | FIX_HOLE, | ||
| 50 | #ifdef CONFIG_HIGHMEM | ||
| 51 | FIX_KMAP_BEGIN, | ||
| 52 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | ||
| 53 | #endif | ||
| 54 | __end_of_fixed_addresses | ||
| 55 | }; | ||
| 56 | |||
| 57 | extern void __set_fixmap (enum fixed_addresses idx, | ||
| 58 | unsigned long phys, pgprot_t flags); | ||
| 59 | |||
| 60 | #define set_fixmap(idx, phys) \ | ||
| 61 | __set_fixmap(idx, phys, PAGE_KERNEL) | ||
| 62 | /* | ||
| 63 | * Some hardware wants to get fixmapped without caching. | ||
| 64 | */ | ||
| 65 | #define set_fixmap_nocache(idx, phys) \ | ||
| 66 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) | ||
| 67 | /* | ||
| 68 | * used by vmalloc.c. | ||
| 69 | * | ||
| 70 | * Leave one empty page between IO pages at 0xfd000000 and | ||
| 71 | * the start of the fixmap. | ||
| 72 | */ | ||
| 73 | #define FIXADDR_TOP (0xfcfff000UL) | ||
| 74 | #define FIXADDR_SIZE ((__end_of_fixed_addresses) << PAGE_SHIFT) | ||
| 75 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | ||
| 76 | |||
| 77 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | ||
| 78 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | ||
| 79 | |||
| 80 | extern void __this_fixmap_does_not_exist(void); | ||
| 81 | |||
| 82 | /* | ||
| 83 | * 'index to address' translation. If anyone tries to use the idx | ||
| 84 | * directly without tranlation, we catch the bug with a NULL-deference | ||
| 85 | * kernel oops. Illegal ranges of incoming indices are caught too. | ||
| 86 | */ | ||
| 87 | static inline unsigned long fix_to_virt(const unsigned int idx) | ||
| 88 | { | ||
| 89 | /* | ||
| 90 | * this branch gets completely eliminated after inlining, | ||
| 91 | * except when someone tries to use fixaddr indices in an | ||
| 92 | * illegal way. (such as mixing up address types or using | ||
| 93 | * out-of-range indices). | ||
| 94 | * | ||
| 95 | * If it doesn't get removed, the linker will complain | ||
| 96 | * loudly with a reasonably clear error message.. | ||
| 97 | */ | ||
| 98 | if (idx >= __end_of_fixed_addresses) | ||
| 99 | __this_fixmap_does_not_exist(); | ||
| 100 | |||
| 101 | return __fix_to_virt(idx); | ||
| 102 | } | ||
| 103 | |||
| 104 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | ||
| 105 | { | ||
| 106 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | ||
| 107 | return __virt_to_fix(vaddr); | ||
| 108 | } | ||
| 109 | |||
| 110 | #endif | ||
