mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 14:09:55 +07:00
d1402fc708
This define is used by arm64 to calculate the size of the vmemmap region. It is defined as the log2 of the upper bound on the size of a struct page. We move it into mm_types.h so it can be defined properly instead of set and checked with a build bug. This also allows us to use the same define for riscv. Link: http://lkml.kernel.org/r/20181107205433.3875-2-logang@deltatee.com Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
/*
|
|
* 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 __ASSEMBLY__
|
|
/*
|
|
* '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)
|
|
|
|
#define set_fixmap_offset_io(idx, phys) \
|
|
__set_fixmap_offset(idx, phys, FIXMAP_PAGE_IO)
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* __ASM_GENERIC_FIXMAP_H */
|