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37 lines
1.8 KiB
37 lines
1.8 KiB
#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_16KB (14 << HUGETLB_FLAG_ENCODE_SHIFT) |
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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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