2
* linux/arch/unicore32/include/asm/pgalloc.h
4
* Code specific to PKUnity SoC and UniCore ISA
6
* Copyright (C) 2001-2010 GUAN Xue-tao
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.
12
#ifndef __UNICORE_PGALLOC_H__
13
#define __UNICORE_PGALLOC_H__
15
#include <asm/pgtable-hwdef.h>
16
#include <asm/processor.h>
17
#include <asm/cacheflush.h>
18
#include <asm/tlbflush.h>
20
#define check_pgt_cache() do { } while (0)
22
#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
23
#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
25
extern pgd_t *get_pgd_slow(struct mm_struct *mm);
26
extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
28
#define pgd_alloc(mm) get_pgd_slow(mm)
29
#define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
31
#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
34
* Allocate one PTE table.
37
pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
41
pte = (pte_t *)__get_free_page(PGALLOC_GFP);
43
clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
48
static inline pgtable_t
49
pte_alloc_one(struct mm_struct *mm, unsigned long addr)
53
pte = alloc_pages(PGALLOC_GFP, 0);
55
if (!PageHighMem(pte)) {
56
void *page = page_address(pte);
57
clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t));
59
pgtable_page_ctor(pte);
68
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
71
free_page((unsigned long)pte);
74
static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
76
pgtable_page_dtor(pte);
80
static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
82
set_pmd(pmdp, __pmd(pmdval));
83
flush_pmd_entry(pmdp);
87
* Populate the pmdp entry with a pointer to the pte. This pmd is part
88
* of the mm address space.
91
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
93
unsigned long pte_ptr = (unsigned long)ptep;
96
* The pmd must be loaded with the physical
97
* address of the PTE table
99
__pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
103
pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
106
page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
108
#define pmd_pgtable(pmd) pmd_page(pmd)