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