#ifndef _ASM_GENERIC_HUGETLB_ENCODE_H_ #define _ASM_GENERIC_HUGETLB_ENCODE_H_ /* * Several system calls take a flag to request "hugetlb" huge pages. * Without further specification, these system calls will use the * system's default huge page size. If a system supports multiple * huge page sizes, the desired huge page size can be specified in * bits [26:31] of the flag arguments. The value in these 6 bits * will encode the log2 of the huge page size. * * The following definitions are associated with this huge page size * encoding in flag arguments. System call specific header files * that use this encoding should include this file. They can then * provide definitions based on these with their own specific prefix. * for example: * #define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT */ #define HUGETLB_FLAG_ENCODE_SHIFT … #define HUGETLB_FLAG_ENCODE_MASK … #define HUGETLB_FLAG_ENCODE_16KB … #define HUGETLB_FLAG_ENCODE_64KB … #define HUGETLB_FLAG_ENCODE_512KB … #define HUGETLB_FLAG_ENCODE_1MB … #define HUGETLB_FLAG_ENCODE_2MB … #define HUGETLB_FLAG_ENCODE_8MB … #define HUGETLB_FLAG_ENCODE_16MB … #define HUGETLB_FLAG_ENCODE_32MB … #define HUGETLB_FLAG_ENCODE_256MB … #define HUGETLB_FLAG_ENCODE_512MB … #define HUGETLB_FLAG_ENCODE_1GB … #define HUGETLB_FLAG_ENCODE_2GB … #define HUGETLB_FLAG_ENCODE_16GB … #endif /* _ASM_GENERIC_HUGETLB_ENCODE_H_ */
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