125981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#ifndef _ASM_GENERIC_HUGETLB_ENCODE_H_ 225981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define _ASM_GENERIC_HUGETLB_ENCODE_H_ 325981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris 425981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris/* 525981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * Several system calls take a flag to request "hugetlb" huge pages. 625981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * Without further specification, these system calls will use the 725981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * system's default huge page size. If a system supports multiple 825981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * huge page sizes, the desired huge page size can be specified in 925981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * bits [26:31] of the flag arguments. The value in these 6 bits 1025981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * will encode the log2 of the huge page size. 1125981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * 1225981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * The following definitions are associated with this huge page size 1325981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * encoding in flag arguments. System call specific header files 1425981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * that use this encoding should include this file. They can then 1525981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * provide definitions based on these with their own specific prefix. 1625981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * for example: 1725981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris * #define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT 1825981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris */ 1925981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris 2025981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_SHIFT 26 2125981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_MASK 0x3f 2225981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris 2325981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_64KB (16 << HUGETLB_FLAG_ENCODE_SHIFT) 2425981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_512KB (19 << HUGETLB_FLAG_ENCODE_SHIFT) 2525981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_1MB (20 << HUGETLB_FLAG_ENCODE_SHIFT) 2625981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_2MB (21 << HUGETLB_FLAG_ENCODE_SHIFT) 2725981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_8MB (23 << HUGETLB_FLAG_ENCODE_SHIFT) 2825981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_16MB (24 << HUGETLB_FLAG_ENCODE_SHIFT) 2925981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_256MB (28 << HUGETLB_FLAG_ENCODE_SHIFT) 3025981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_1GB (30 << HUGETLB_FLAG_ENCODE_SHIFT) 3125981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_2GB (31 << HUGETLB_FLAG_ENCODE_SHIFT) 3225981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#define HUGETLB_FLAG_ENCODE_16GB (34 << HUGETLB_FLAG_ENCODE_SHIFT) 3325981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris 3425981136fb13bcacf5f475f3e0ec750341e1e671Christopher Ferris#endif /* _ASM_GENERIC_HUGETLB_ENCODE_H_ */ 35