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Linux/include/asm-generic/fixmap.h

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  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  * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
 12  * Break out common bits to asm-generic by Mark Salter, November 2013
 13  */
 14 
 15 #ifndef __ASM_GENERIC_FIXMAP_H
 16 #define __ASM_GENERIC_FIXMAP_H
 17 
 18 #include <linux/bug.h>
 19 
 20 #define __fix_to_virt(x)        (FIXADDR_TOP - ((x) << PAGE_SHIFT))
 21 #define __virt_to_fix(x)        ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
 22 
 23 #ifndef __ASSEMBLY__
 24 /*
 25  * 'index to address' translation. If anyone tries to use the idx
 26  * directly without translation, we catch the bug with a NULL-deference
 27  * kernel oops. Illegal ranges of incoming indices are caught too.
 28  */
 29 static __always_inline unsigned long fix_to_virt(const unsigned int idx)
 30 {
 31         BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
 32         return __fix_to_virt(idx);
 33 }
 34 
 35 static inline unsigned long virt_to_fix(const unsigned long vaddr)
 36 {
 37         BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
 38         return __virt_to_fix(vaddr);
 39 }
 40 
 41 /*
 42  * Provide some reasonable defaults for page flags.
 43  * Not all architectures use all of these different types and some
 44  * architectures use different names.
 45  */
 46 #ifndef FIXMAP_PAGE_NORMAL
 47 #define FIXMAP_PAGE_NORMAL PAGE_KERNEL
 48 #endif
 49 #if !defined(FIXMAP_PAGE_RO) && defined(PAGE_KERNEL_RO)
 50 #define FIXMAP_PAGE_RO PAGE_KERNEL_RO
 51 #endif
 52 #ifndef FIXMAP_PAGE_NOCACHE
 53 #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
 54 #endif
 55 #ifndef FIXMAP_PAGE_IO
 56 #define FIXMAP_PAGE_IO PAGE_KERNEL_IO
 57 #endif
 58 #ifndef FIXMAP_PAGE_CLEAR
 59 #define FIXMAP_PAGE_CLEAR __pgprot(0)
 60 #endif
 61 
 62 #ifndef set_fixmap
 63 #define set_fixmap(idx, phys)                           \
 64         __set_fixmap(idx, phys, FIXMAP_PAGE_NORMAL)
 65 #endif
 66 
 67 #ifndef clear_fixmap
 68 #define clear_fixmap(idx)                       \
 69         __set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR)
 70 #endif
 71 
 72 /* Return a pointer with offset calculated */
 73 #define __set_fixmap_offset(idx, phys, flags)                           \
 74 ({                                                                      \
 75         unsigned long ________addr;                                     \
 76         __set_fixmap(idx, phys, flags);                                 \
 77         ________addr = fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1));   \
 78         ________addr;                                                   \
 79 })
 80 
 81 #define set_fixmap_offset(idx, phys) \
 82         __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NORMAL)
 83 
 84 /*
 85  * Some hardware wants to get fixmapped without caching.
 86  */
 87 #define set_fixmap_nocache(idx, phys) \
 88         __set_fixmap(idx, phys, FIXMAP_PAGE_NOCACHE)
 89 
 90 #define set_fixmap_offset_nocache(idx, phys) \
 91         __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NOCACHE)
 92 
 93 /*
 94  * Some fixmaps are for IO
 95  */
 96 #define set_fixmap_io(idx, phys) \
 97         __set_fixmap(idx, phys, FIXMAP_PAGE_IO)
 98 
 99 #define set_fixmap_offset_io(idx, phys) \
100         __set_fixmap_offset(idx, phys, FIXMAP_PAGE_IO)
101 
102 #endif /* __ASSEMBLY__ */
103 #endif /* __ASM_GENERIC_FIXMAP_H */
104 

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