| #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 26 | |
| #define HUGETLB_FLAG_ENCODE_MASK 0x3f | |
| #define HUGETLB_FLAG_ENCODE_16KB (14U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_64KB (16U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_512KB (19U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_1MB (20U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_2MB (21U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_8MB (23U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_16MB (24U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_32MB (25U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_256MB (28U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_512MB (29U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_1GB (30U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_2GB (31U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #define HUGETLB_FLAG_ENCODE_16GB (34U << HUGETLB_FLAG_ENCODE_SHIFT) | |
| #endif /* _ASM_GENERIC_HUGETLB_ENCODE_H_ */ |