1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * OpenRISC Linux 4 * 5 * Linux architectural port borrowing liberally from similar works of 6 * others. All original copyrights apply as per the original source 7 * declaration. 8 * 9 * OpenRISC implementation: 10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 12 * et al. 13 */ 14 15 #ifndef __ASM_OPENRISC_PGALLOC_H 16 #define __ASM_OPENRISC_PGALLOC_H 17 18 #include <asm/page.h> 19 #include <linux/threads.h> 20 #include <linux/mm.h> 21 #include <linux/memblock.h> 22 23 #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL 24 #include <asm-generic/pgalloc.h> 25 26 extern int mem_init_done; 27 28 #define pmd_populate_kernel(mm, pmd, pte) \ 29 set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte))) 30 31 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 32 struct page *pte) 33 { 34 set_pmd(pmd, __pmd(_KERNPG_TABLE + 35 ((unsigned long)page_to_pfn(pte) << 36 (unsigned long) PAGE_SHIFT))); 37 } 38 39 /* 40 * Allocate and free page tables. 41 */ 42 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 43 { 44 pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL); 45 46 if (ret) { 47 memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); 48 memcpy(ret + USER_PTRS_PER_PGD, 49 swapper_pg_dir + USER_PTRS_PER_PGD, 50 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 51 52 } 53 return ret; 54 } 55 56 #if 0 57 /* FIXME: This seems to be the preferred style, but we are using 58 * current_pgd (from mm->pgd) to load kernel pages so we need it 59 * initialized. This needs to be looked into. 60 */ 61 extern inline pgd_t *pgd_alloc(struct mm_struct *mm) 62 { 63 return (pgd_t *)get_zeroed_page(GFP_KERNEL); 64 } 65 #endif 66 67 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm); 68 69 #define __pte_free_tlb(tlb, pte, addr) \ 70 do { \ 71 pagetable_pte_dtor(page_ptdesc(pte)); \ 72 tlb_remove_page_ptdesc((tlb), (page_ptdesc(pte))); \ 73 } while (0) 74 75 #endif 76