1 /* 2 * arch/arm64/mm/hugetlbpage.c 3 * 4 * Copyright (C) 2013 Linaro Ltd. 5 * 6 * Based on arch/x86/mm/hugetlbpage.c. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/init.h> 19 #include <linux/fs.h> 20 #include <linux/mm.h> 21 #include <linux/hugetlb.h> 22 #include <linux/pagemap.h> 23 #include <linux/err.h> 24 #include <linux/sysctl.h> 25 #include <asm/mman.h> 26 #include <asm/tlb.h> 27 #include <asm/tlbflush.h> 28 #include <asm/pgalloc.h> 29 30 int pmd_huge(pmd_t pmd) 31 { 32 return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT); 33 } 34 35 int pud_huge(pud_t pud) 36 { 37 #ifndef __PAGETABLE_PMD_FOLDED 38 return pud_val(pud) && !(pud_val(pud) & PUD_TABLE_BIT); 39 #else 40 return 0; 41 #endif 42 } 43 44 static __init int setup_hugepagesz(char *opt) 45 { 46 unsigned long ps = memparse(opt, &opt); 47 if (ps == PMD_SIZE) { 48 hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); 49 } else if (ps == PUD_SIZE) { 50 hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); 51 } else { 52 pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); 53 return 0; 54 } 55 return 1; 56 } 57 __setup("hugepagesz=", setup_hugepagesz); 58