1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/sh/mm/hugetlbpage.c 4 * 5 * SuperH HugeTLB page support. 6 * 7 * Cloned from sparc64 by Paul Mundt. 8 * 9 * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com) 10 */ 11 12 #include <linux/init.h> 13 #include <linux/fs.h> 14 #include <linux/mm.h> 15 #include <linux/hugetlb.h> 16 #include <linux/pagemap.h> 17 #include <linux/sysctl.h> 18 19 #include <asm/mman.h> 20 #include <asm/pgalloc.h> 21 #include <asm/tlb.h> 22 #include <asm/tlbflush.h> 23 #include <asm/cacheflush.h> 24 25 pte_t *huge_pte_alloc(struct mm_struct *mm, 26 unsigned long addr, unsigned long sz) 27 { 28 pgd_t *pgd; 29 p4d_t *p4d; 30 pud_t *pud; 31 pmd_t *pmd; 32 pte_t *pte = NULL; 33 34 pgd = pgd_offset(mm, addr); 35 if (pgd) { 36 p4d = p4d_alloc(mm, pgd, addr); 37 if (p4d) { 38 pud = pud_alloc(mm, p4d, addr); 39 if (pud) { 40 pmd = pmd_alloc(mm, pud, addr); 41 if (pmd) 42 pte = pte_alloc_map(mm, pmd, addr); 43 } 44 } 45 } 46 47 return pte; 48 } 49 50 pte_t *huge_pte_offset(struct mm_struct *mm, 51 unsigned long addr, unsigned long sz) 52 { 53 pgd_t *pgd; 54 p4d_t *p4d; 55 pud_t *pud; 56 pmd_t *pmd; 57 pte_t *pte = NULL; 58 59 pgd = pgd_offset(mm, addr); 60 if (pgd) { 61 p4d = p4d_offset(pgd, addr); 62 if (p4d) { 63 pud = pud_offset(p4d, addr); 64 if (pud) { 65 pmd = pmd_offset(pud, addr); 66 if (pmd) 67 pte = pte_offset_map(pmd, addr); 68 } 69 } 70 } 71 72 return pte; 73 } 74 75 int pmd_huge(pmd_t pmd) 76 { 77 return 0; 78 } 79 80 int pud_huge(pud_t pud) 81 { 82 return 0; 83 } 84