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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6588 | serge | 1 | /* |
| 2 | * fixmap.h: compile-time virtual memory allocation |
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| 3 | * |
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| 4 | * This file is subject to the terms and conditions of the GNU General Public |
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| 5 | * License. See the file "COPYING" in the main directory of this archive |
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| 6 | * for more details. |
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| 7 | * |
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| 8 | * Copyright (C) 1998 Ingo Molnar |
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| 9 | * |
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| 10 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 |
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| 11 | * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009 |
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| 12 | * Break out common bits to asm-generic by Mark Salter, November 2013 |
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| 13 | */ |
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| 14 | |||
| 15 | #ifndef __ASM_GENERIC_FIXMAP_H |
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| 16 | #define __ASM_GENERIC_FIXMAP_H |
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| 17 | |||
| 18 | #include |
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| 19 | |||
| 20 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) |
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| 21 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) |
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| 22 | |||
| 23 | #ifndef __ASSEMBLY__ |
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| 24 | /* |
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| 25 | * 'index to address' translation. If anyone tries to use the idx |
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| 26 | * directly without translation, we catch the bug with a NULL-deference |
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| 27 | * kernel oops. Illegal ranges of incoming indices are caught too. |
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| 28 | */ |
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| 29 | static __always_inline unsigned long fix_to_virt(const unsigned int idx) |
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| 30 | { |
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| 31 | BUILD_BUG_ON(idx >= __end_of_fixed_addresses); |
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| 32 | return __fix_to_virt(idx); |
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| 33 | } |
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| 34 | |||
| 35 | static inline unsigned long virt_to_fix(const unsigned long vaddr) |
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| 36 | { |
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| 37 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); |
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| 38 | return __virt_to_fix(vaddr); |
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| 39 | } |
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| 40 | |||
| 41 | /* |
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| 42 | * Provide some reasonable defaults for page flags. |
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| 43 | * Not all architectures use all of these different types and some |
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| 44 | * architectures use different names. |
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| 45 | */ |
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| 46 | #ifndef FIXMAP_PAGE_NORMAL |
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| 47 | #define FIXMAP_PAGE_NORMAL PAGE_KERNEL |
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| 48 | #endif |
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| 49 | #if !defined(FIXMAP_PAGE_RO) && defined(PAGE_KERNEL_RO) |
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| 50 | #define FIXMAP_PAGE_RO PAGE_KERNEL_RO |
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| 51 | #endif |
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| 52 | #ifndef FIXMAP_PAGE_NOCACHE |
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| 53 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE |
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| 54 | #endif |
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| 55 | #ifndef FIXMAP_PAGE_IO |
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| 56 | #define FIXMAP_PAGE_IO PAGE_KERNEL_IO |
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| 57 | #endif |
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| 58 | #ifndef FIXMAP_PAGE_CLEAR |
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| 59 | #define FIXMAP_PAGE_CLEAR __pgprot(0) |
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| 60 | #endif |
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| 61 | |||
| 62 | #ifndef set_fixmap |
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| 63 | #define set_fixmap(idx, phys) \ |
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| 64 | __set_fixmap(idx, phys, FIXMAP_PAGE_NORMAL) |
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| 65 | #endif |
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| 66 | |||
| 67 | #ifndef clear_fixmap |
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| 68 | #define clear_fixmap(idx) \ |
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| 69 | __set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR) |
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| 70 | #endif |
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| 71 | |||
| 72 | /* Return a pointer with offset calculated */ |
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| 7143 | serge | 73 | #define __set_fixmap_offset(idx, phys, flags) \ |
| 74 | ({ \ |
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| 75 | unsigned long ________addr; \ |
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| 76 | __set_fixmap(idx, phys, flags); \ |
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| 77 | ________addr = fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1)); \ |
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| 78 | ________addr; \ |
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| 6588 | serge | 79 | }) |
| 80 | |||
| 81 | #define set_fixmap_offset(idx, phys) \ |
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| 82 | __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NORMAL) |
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| 83 | |||
| 84 | /* |
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| 85 | * Some hardware wants to get fixmapped without caching. |
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| 86 | */ |
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| 87 | #define set_fixmap_nocache(idx, phys) \ |
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| 88 | __set_fixmap(idx, phys, FIXMAP_PAGE_NOCACHE) |
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| 89 | |||
| 90 | #define set_fixmap_offset_nocache(idx, phys) \ |
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| 91 | __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NOCACHE) |
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| 92 | |||
| 93 | /* |
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| 94 | * Some fixmaps are for IO |
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| 95 | */ |
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| 96 | #define set_fixmap_io(idx, phys) \ |
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| 97 | __set_fixmap(idx, phys, FIXMAP_PAGE_IO) |
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| 98 | |||
| 99 | #define set_fixmap_offset_io(idx, phys) \ |
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| 100 | __set_fixmap_offset(idx, phys, FIXMAP_PAGE_IO) |
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| 101 | |||
| 102 | #endif /* __ASSEMBLY__ */ |
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| 103 | #endif /* __ASM_GENERIC_FIXMAP_H */ |