diff options
Diffstat (limited to 'include/asm-mips/fixmap.h')
| -rw-r--r-- | include/asm-mips/fixmap.h | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/include/asm-mips/fixmap.h b/include/asm-mips/fixmap.h deleted file mode 100644 index 9cc8522a394f..000000000000 --- a/include/asm-mips/fixmap.h +++ /dev/null | |||
| @@ -1,118 +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 <asm/page.h> | ||
| 17 | #ifdef CONFIG_HIGHMEM | ||
| 18 | #include <linux/threads.h> | ||
| 19 | #include <asm/kmap_types.h> | ||
| 20 | #endif | ||
| 21 | |||
| 22 | /* | ||
| 23 | * Here we define all the compile-time 'special' virtual | ||
| 24 | * addresses. The point is to have a constant address at | ||
| 25 | * compile time, but to set the physical address only | ||
| 26 | * in the boot process. We allocate these special addresses | ||
| 27 | * from the end of virtual memory (0xfffff000) backwards. | ||
| 28 | * Also this lets us do fail-safe vmalloc(), we | ||
| 29 | * can guarantee that these special addresses and | ||
| 30 | * vmalloc()-ed addresses never overlap. | ||
| 31 | * | ||
| 32 | * these 'compile-time allocated' memory buffers are | ||
| 33 | * fixed-size 4k pages. (or larger if used with an increment | ||
| 34 | * highger than 1) use fixmap_set(idx,phys) to associate | ||
| 35 | * physical memory with fixmap indices. | ||
| 36 | * | ||
| 37 | * TLB entries of such buffers will not be flushed across | ||
| 38 | * task switches. | ||
| 39 | */ | ||
| 40 | |||
| 41 | /* | ||
| 42 | * on UP currently we will have no trace of the fixmap mechanizm, | ||
| 43 | * no page table allocations, etc. This might change in the | ||
| 44 | * future, say framebuffers for the console driver(s) could be | ||
| 45 | * fix-mapped? | ||
| 46 | */ | ||
| 47 | enum fixed_addresses { | ||
| 48 | #define FIX_N_COLOURS 8 | ||
| 49 | FIX_CMAP_BEGIN, | ||
| 50 | #ifdef CONFIG_MIPS_MT_SMTC | ||
| 51 | FIX_CMAP_END = FIX_CMAP_BEGIN + (FIX_N_COLOURS * NR_CPUS), | ||
| 52 | #else | ||
| 53 | FIX_CMAP_END = FIX_CMAP_BEGIN + FIX_N_COLOURS, | ||
| 54 | #endif | ||
| 55 | #ifdef CONFIG_HIGHMEM | ||
| 56 | /* reserved pte's for temporary kernel mappings */ | ||
| 57 | FIX_KMAP_BEGIN = FIX_CMAP_END + 1, | ||
| 58 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | ||
| 59 | #endif | ||
| 60 | __end_of_fixed_addresses | ||
| 61 | }; | ||
| 62 | |||
| 63 | /* | ||
| 64 | * used by vmalloc.c. | ||
| 65 | * | ||
| 66 | * Leave one empty page between vmalloc'ed areas and | ||
| 67 | * the start of the fixmap, and leave one page empty | ||
| 68 | * at the top of mem.. | ||
| 69 | */ | ||
| 70 | #if defined(CONFIG_CPU_TX39XX) || defined(CONFIG_CPU_TX49XX) | ||
| 71 | #define FIXADDR_TOP ((unsigned long)(long)(int)(0xff000000 - 0x20000)) | ||
| 72 | #else | ||
| 73 | #define FIXADDR_TOP ((unsigned long)(long)(int)0xfffe0000) | ||
| 74 | #endif | ||
| 75 | #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) | ||
| 76 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | ||
| 77 | |||
| 78 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | ||
| 79 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | ||
| 80 | |||
| 81 | extern void __this_fixmap_does_not_exist(void); | ||
| 82 | |||
| 83 | /* | ||
| 84 | * 'index to address' translation. If anyone tries to use the idx | ||
| 85 | * directly without tranlation, we catch the bug with a NULL-deference | ||
| 86 | * kernel oops. Illegal ranges of incoming indices are caught too. | ||
| 87 | */ | ||
| 88 | static inline unsigned long fix_to_virt(const unsigned int idx) | ||
| 89 | { | ||
| 90 | /* | ||
| 91 | * this branch gets completely eliminated after inlining, | ||
| 92 | * except when someone tries to use fixaddr indices in an | ||
| 93 | * illegal way. (such as mixing up address types or using | ||
| 94 | * out-of-range indices). | ||
| 95 | * | ||
| 96 | * If it doesn't get removed, the linker will complain | ||
| 97 | * loudly with a reasonably clear error message.. | ||
| 98 | */ | ||
| 99 | if (idx >= __end_of_fixed_addresses) | ||
| 100 | __this_fixmap_does_not_exist(); | ||
| 101 | |||
| 102 | return __fix_to_virt(idx); | ||
| 103 | } | ||
| 104 | |||
| 105 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | ||
| 106 | { | ||
| 107 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | ||
| 108 | return __virt_to_fix(vaddr); | ||
| 109 | } | ||
| 110 | |||
| 111 | /* | ||
| 112 | * Called from pgtable_init() | ||
| 113 | */ | ||
| 114 | extern void fixrange_init(unsigned long start, unsigned long end, | ||
| 115 | pgd_t *pgd_base); | ||
| 116 | |||
| 117 | |||
| 118 | #endif | ||
