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/* 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
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