/* * 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. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #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>#include <linux/bootmem.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, unsigned long address); static inline struct page *pte_alloc_one(struct mm_struct *mm,					 unsigned long address){	struct page *pte;	pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);	if (!pte)		return NULL;	clear_page(page_address(pte));	if (!pgtable_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_page_dtor(pte);	__free_page(pte);}  #define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte))#define pmd_pgtable(pmd) pmd_page(pmd) #define check_pgt_cache()          do { } while (0) #endif