| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * OpenRISC Linux |
| * |
| * Linux architectural port borrowing liberally from similar works of |
| * others. All original copyrights apply as per the original source |
| * declaration. |
| * |
| * OpenRISC implementation: |
| * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> |
| * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> |
| * et al. |
| */ |
| |
| #ifndef __ASM_OPENRISC_PGALLOC_H |
| #define __ASM_OPENRISC_PGALLOC_H |
| |
| #include <asm/page.h> |
| #include <linux/threads.h> |
| #include <linux/mm.h> |
| #include <linux/memblock.h> |
| |
| extern int mem_init_done; |
| |
| #define pmd_populate_kernel(mm, pmd, pte) \ |
| set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte))) |
| |
| static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, |
| struct page *pte) |
| { |
| set_pmd(pmd, __pmd(_KERNPG_TABLE + |
| ((unsigned long)page_to_pfn(pte) << |
| (unsigned long) PAGE_SHIFT))); |
| } |
| |
| /* |
| * Allocate and free page tables. |
| */ |
| static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
| { |
| pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL); |
| |
| if (ret) { |
| memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); |
| memcpy(ret + USER_PTRS_PER_PGD, |
| swapper_pg_dir + USER_PTRS_PER_PGD, |
| (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); |
| |
| } |
| return ret; |
| } |
| |
| #if 0 |
| /* FIXME: This seems to be the preferred style, but we are using |
| * current_pgd (from mm->pgd) to load kernel pages so we need it |
| * initialized. This needs to be looked into. |
| */ |
| extern inline pgd_t *pgd_alloc(struct mm_struct *mm) |
| { |
| return (pgd_t *)get_zeroed_page(GFP_KERNEL); |
| } |
| #endif |
| |
| static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
| { |
| free_page((unsigned long)pgd); |
| } |
| |
| extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm); |
| |
| static inline struct page *pte_alloc_one(struct mm_struct *mm) |
| { |
| struct page *pte; |
| pte = alloc_pages(GFP_KERNEL, 0); |
| if (!pte) |
| return NULL; |
| clear_page(page_address(pte)); |
| if (!pgtable_pte_page_ctor(pte)) { |
| __free_page(pte); |
| return NULL; |
| } |
| return pte; |
| } |
| |
| static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
| { |
| free_page((unsigned long)pte); |
| } |
| |
| static inline void pte_free(struct mm_struct *mm, struct page *pte) |
| { |
| pgtable_pte_page_dtor(pte); |
| __free_page(pte); |
| } |
| |
| #define __pte_free_tlb(tlb, pte, addr) \ |
| do { \ |
| pgtable_pte_page_dtor(pte); \ |
| tlb_remove_page((tlb), (pte)); \ |
| } while (0) |
| |
| #define pmd_pgtable(pmd) pmd_page(pmd) |
| |
| #endif |