#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_ */