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104 lines
2.9 KiB
104 lines
2.9 KiB
/* |
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* fixmap.h: compile-time virtual memory allocation |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1998 Ingo Molnar |
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* |
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* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 |
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* x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009 |
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* Break out common bits to asm-generic by Mark Salter, November 2013 |
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*/ |
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#ifndef __ASM_GENERIC_FIXMAP_H |
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#define __ASM_GENERIC_FIXMAP_H |
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#include <linux/bug.h> |
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#include <linux/mm_types.h> |
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#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) |
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#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) |
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#ifndef __ASSEMBLY__ |
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/* |
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* 'index to address' translation. If anyone tries to use the idx |
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* directly without translation, we catch the bug with a NULL-deference |
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* kernel oops. Illegal ranges of incoming indices are caught too. |
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*/ |
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static __always_inline unsigned long fix_to_virt(const unsigned int idx) |
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{ |
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BUILD_BUG_ON(idx >= __end_of_fixed_addresses); |
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return __fix_to_virt(idx); |
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} |
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static inline unsigned long virt_to_fix(const unsigned long vaddr) |
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{ |
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BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); |
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return __virt_to_fix(vaddr); |
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} |
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/* |
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* Provide some reasonable defaults for page flags. |
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* Not all architectures use all of these different types and some |
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* architectures use different names. |
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*/ |
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#ifndef FIXMAP_PAGE_NORMAL |
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#define FIXMAP_PAGE_NORMAL PAGE_KERNEL |
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#endif |
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#if !defined(FIXMAP_PAGE_RO) && defined(PAGE_KERNEL_RO) |
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#define FIXMAP_PAGE_RO PAGE_KERNEL_RO |
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#endif |
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#ifndef FIXMAP_PAGE_NOCACHE |
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#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE |
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#endif |
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#ifndef FIXMAP_PAGE_IO |
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#define FIXMAP_PAGE_IO PAGE_KERNEL_IO |
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#endif |
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#ifndef FIXMAP_PAGE_CLEAR |
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#define FIXMAP_PAGE_CLEAR __pgprot(0) |
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#endif |
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#ifndef set_fixmap |
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#define set_fixmap(idx, phys) \ |
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__set_fixmap(idx, phys, FIXMAP_PAGE_NORMAL) |
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#endif |
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#ifndef clear_fixmap |
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#define clear_fixmap(idx) \ |
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__set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR) |
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#endif |
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/* Return a pointer with offset calculated */ |
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#define __set_fixmap_offset(idx, phys, flags) \ |
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({ \ |
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unsigned long ________addr; \ |
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__set_fixmap(idx, phys, flags); \ |
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________addr = fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1)); \ |
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________addr; \ |
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}) |
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#define set_fixmap_offset(idx, phys) \ |
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__set_fixmap_offset(idx, phys, FIXMAP_PAGE_NORMAL) |
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/* |
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* Some hardware wants to get fixmapped without caching. |
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*/ |
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#define set_fixmap_nocache(idx, phys) \ |
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__set_fixmap(idx, phys, FIXMAP_PAGE_NOCACHE) |
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#define set_fixmap_offset_nocache(idx, phys) \ |
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__set_fixmap_offset(idx, phys, FIXMAP_PAGE_NOCACHE) |
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/* |
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* Some fixmaps are for IO |
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*/ |
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#define set_fixmap_io(idx, phys) \ |
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__set_fixmap(idx, phys, FIXMAP_PAGE_IO) |
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#define set_fixmap_offset_io(idx, phys) \ |
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__set_fixmap_offset(idx, phys, FIXMAP_PAGE_IO) |
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#endif /* __ASSEMBLY__ */ |
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#endif /* __ASM_GENERIC_FIXMAP_H */
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