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- /*
- * arch/arm64/mm/hugetlbpage.c
- *
- * Copyright (C) 2013 Linaro Ltd.
- *
- * Based on arch/x86/mm/hugetlbpage.c.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #include <linux/init.h>
- #include <linux/fs.h>
- #include <linux/mm.h>
- #include <linux/hugetlb.h>
- #include <linux/pagemap.h>
- #include <linux/err.h>
- #include <linux/sysctl.h>
- #include <asm/mman.h>
- #include <asm/tlb.h>
- #include <asm/tlbflush.h>
- #include <asm/pgalloc.h>
- int pmd_huge(pmd_t pmd)
- {
- return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
- }
- int pud_huge(pud_t pud)
- {
- #ifndef __PAGETABLE_PMD_FOLDED
- return pud_val(pud) && !(pud_val(pud) & PUD_TABLE_BIT);
- #else
- return 0;
- #endif
- }
- static __init int setup_hugepagesz(char *opt)
- {
- unsigned long ps = memparse(opt, &opt);
- if (ps == PMD_SIZE) {
- hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
- } else if (ps == PUD_SIZE) {
- hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
- } else {
- pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20);
- return 0;
- }
- return 1;
- }
- __setup("hugepagesz=", setup_hugepagesz);
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