20916d4636
ARM64 architecture also supports 32MB and 512MB HugeTLB page sizes. This just adds mmap() system call argument encoding for them. Link: http://lkml.kernel.org/r/1537841300-6979-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Punit Agrawal <punit.agrawal@arm.com> Acked-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Will Deacon <will.deacon@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
37 lines
1.7 KiB
C
37 lines
1.7 KiB
C
#ifndef _ASM_GENERIC_HUGETLB_ENCODE_H_
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#define _ASM_GENERIC_HUGETLB_ENCODE_H_
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/*
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* Several system calls take a flag to request "hugetlb" huge pages.
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* Without further specification, these system calls will use the
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* system's default huge page size. If a system supports multiple
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* huge page sizes, the desired huge page size can be specified in
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* bits [26:31] of the flag arguments. The value in these 6 bits
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* will encode the log2 of the huge page size.
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*
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* The following definitions are associated with this huge page size
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* encoding in flag arguments. System call specific header files
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* that use this encoding should include this file. They can then
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* provide definitions based on these with their own specific prefix.
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* for example:
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* #define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
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*/
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#define HUGETLB_FLAG_ENCODE_SHIFT 26
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#define HUGETLB_FLAG_ENCODE_MASK 0x3f
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#define HUGETLB_FLAG_ENCODE_64KB (16 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_512KB (19 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_1MB (20 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_2MB (21 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_8MB (23 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_16MB (24 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_32MB (25 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_256MB (28 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_512MB (29 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_1GB (30 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_2GB (31 << HUGETLB_FLAG_ENCODE_SHIFT)
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#define HUGETLB_FLAG_ENCODE_16GB (34 << HUGETLB_FLAG_ENCODE_SHIFT)
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#endif /* _ASM_GENERIC_HUGETLB_ENCODE_H_ */
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