1/*
  2 * linux/arch/unicore32/include/asm/pgalloc.h
  3 *
  4 * Code specific to PKUnity SoC and UniCore ISA
  5 *
  6 * Copyright (C) 2001-2010 GUAN Xue-tao
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License version 2 as
 10 * published by the Free Software Foundation.
 11 */
 12#ifndef __UNICORE_PGALLOC_H__
 13#define __UNICORE_PGALLOC_H__
 14
 15#include <asm/pgtable-hwdef.h>
 16#include <asm/processor.h>
 17#include <asm/cacheflush.h>
 18#include <asm/tlbflush.h>
 19
 20#define check_pgt_cache()		do { } while (0)
 21
 22#define _PAGE_USER_TABLE	(PMD_TYPE_TABLE | PMD_PRESENT)
 23#define _PAGE_KERNEL_TABLE	(PMD_TYPE_TABLE | PMD_PRESENT)
 24
 25extern pgd_t *get_pgd_slow(struct mm_struct *mm);
 26extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
 27
 28#define pgd_alloc(mm)			get_pgd_slow(mm)
 29#define pgd_free(mm, pgd)		free_pgd_slow(mm, pgd)
 30
 31#define PGALLOC_GFP	(GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
 32
 33/*
 34 * Allocate one PTE table.
 35 */
 36static inline pte_t *
 37pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
 38{
 39	pte_t *pte;
 40
 41	pte = (pte_t *)__get_free_page(PGALLOC_GFP);
 42	if (pte)
 43		clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
 44
 45	return pte;
 46}
 47
 48static inline pgtable_t
 49pte_alloc_one(struct mm_struct *mm, unsigned long addr)
 50{
 51	struct page *pte;
 52
 53	pte = alloc_pages(PGALLOC_GFP, 0);
 54	if (pte) {
 55		if (!PageHighMem(pte)) {
 56			void *page = page_address(pte);
 57			clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t));
 58		}
 59		pgtable_page_ctor(pte);
 60	}
 61
 62	return pte;
 63}
 64
 65/*
 66 * Free one PTE table.
 67 */
 68static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 69{
 70	if (pte)
 71		free_page((unsigned long)pte);
 72}
 73
 74static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 75{
 76	pgtable_page_dtor(pte);
 77	__free_page(pte);
 78}
 79
 80static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
 81{
 82	set_pmd(pmdp, __pmd(pmdval));
 83	flush_pmd_entry(pmdp);
 84}
 85
 86/*
 87 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
 88 * of the mm address space.
 89 */
 90static inline void
 91pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
 92{
 93	unsigned long pte_ptr = (unsigned long)ptep;
 94
 95	/*
 96	 * The pmd must be loaded with the physical
 97	 * address of the PTE table
 98	 */
 99	__pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
100}
101
102static inline void
103pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
104{
105	__pmd_populate(pmdp,
106			page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
107}
108#define pmd_pgtable(pmd) pmd_page(pmd)
109
110#endif