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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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2.8 kB · 101 lines
C
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102/* * fixmap.h: compile-time virtual memory allocation * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1998 Ingo Molnar * * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009 * Break out common bits to asm-generic by Mark Salter, November 2013 */
#ifndef __ASM_GENERIC_FIXMAP_H#define __ASM_GENERIC_FIXMAP_H
#include <linux/bug.h>#include <linux/mm_types.h>
#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
#ifndef __ASSEMBLER__/* * 'index to address' translation. If anyone tries to use the idx * directly without translation, we catch the bug with a NULL-deference * kernel oops. Illegal ranges of incoming indices are caught too. */static __always_inline unsigned long fix_to_virt(const unsigned int idx){ BUILD_BUG_ON(idx >= __end_of_fixed_addresses); return __fix_to_virt(idx);}
static inline unsigned long virt_to_fix(const unsigned long vaddr){ BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); return __virt_to_fix(vaddr);}
/* * Provide some reasonable defaults for page flags. * Not all architectures use all of these different types and some * architectures use different names. */#ifndef FIXMAP_PAGE_NORMAL#define FIXMAP_PAGE_NORMAL PAGE_KERNEL#endif#if !defined(FIXMAP_PAGE_RO) && defined(PAGE_KERNEL_RO)#define FIXMAP_PAGE_RO PAGE_KERNEL_RO#endif#ifndef FIXMAP_PAGE_NOCACHE#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE#endif#ifndef FIXMAP_PAGE_IO#define FIXMAP_PAGE_IO PAGE_KERNEL_IO#endif#ifndef FIXMAP_PAGE_CLEAR#define FIXMAP_PAGE_CLEAR __pgprot(0)#endif
#ifndef set_fixmap#define set_fixmap(idx, phys) \ __set_fixmap(idx, phys, FIXMAP_PAGE_NORMAL)#endif
#ifndef clear_fixmap#define clear_fixmap(idx) \ __set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR)#endif
/* Return a pointer with offset calculated */#define __set_fixmap_offset(idx, phys, flags) \({ \ unsigned long ________addr; \ __set_fixmap(idx, phys, flags); \ ________addr = fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1)); \ ________addr; \})
#define set_fixmap_offset(idx, phys) \ __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NORMAL)
/* * Some hardware wants to get fixmapped without caching. */#define set_fixmap_nocache(idx, phys) \ __set_fixmap(idx, phys, FIXMAP_PAGE_NOCACHE)
#define set_fixmap_offset_nocache(idx, phys) \ __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NOCACHE)
/* * Some fixmaps are for IO */#define set_fixmap_io(idx, phys) \ __set_fixmap(idx, phys, FIXMAP_PAGE_IO)
#endif /* __ASSEMBLER__ */#endif /* __ASM_GENERIC_FIXMAP_H */