cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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fixmap.h (2932B)

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