1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file "COPYING" in the main directory of this archive
 4 * for more details.
 5 *
 6 * Copyright (C) 1999, 2000 by Silicon Graphics
 7 * Copyright (C) 2003 by Ralf Baechle
 8 */
 9#include <linux/init.h>
10#include <linux/mm.h>
11#include <asm/fixmap.h>
12#include <asm/pgtable.h>
13#include <asm/pgalloc.h>
 
14
15void pgd_init(unsigned long page)
16{
17	unsigned long *p, *end;
18	unsigned long entry;
19
20#ifdef __PAGETABLE_PMD_FOLDED
21	entry = (unsigned long)invalid_pte_table;
22#else
23	entry = (unsigned long)invalid_pmd_table;
24#endif
25
26 	p = (unsigned long *) page;
27	end = p + PTRS_PER_PGD;
28
29	while (p < end) {
30		p[0] = entry;
31		p[1] = entry;
32		p[2] = entry;
33		p[3] = entry;
34		p[4] = entry;
35		p[5] = entry;
36		p[6] = entry;
37		p[7] = entry;
38		p += 8;
39	}
 
 
 
40}
41
42#ifndef __PAGETABLE_PMD_FOLDED
43void pmd_init(unsigned long addr, unsigned long pagetable)
44{
45	unsigned long *p, *end;
46
47 	p = (unsigned long *) addr;
48	end = p + PTRS_PER_PMD;
49
50	while (p < end) {
51		p[0] = pagetable;
52		p[1] = pagetable;
53		p[2] = pagetable;
54		p[3] = pagetable;
55		p[4] = pagetable;
56		p[5] = pagetable;
57		p[6] = pagetable;
58		p[7] = pagetable;
59		p += 8;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
60	}
61}
 
62#endif
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
63
64void __init pagetable_init(void)
65{
66	unsigned long vaddr;
67	pgd_t *pgd_base;
68
69	/* Initialize the entire pgd.  */
70	pgd_init((unsigned long)swapper_pg_dir);
71#ifndef __PAGETABLE_PMD_FOLDED
72	pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
73#endif
74	pgd_base = swapper_pg_dir;
75	/*
76	 * Fixed mappings:
77	 */
78	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
79	fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
80}

  1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 1999, 2000 by Silicon Graphics
  7 * Copyright (C) 2003 by Ralf Baechle
  8 */
  9#include <linux/init.h>
 10#include <linux/mm.h>
 11#include <asm/fixmap.h>
 12#include <asm/pgtable.h>
 13#include <asm/pgalloc.h>
 14#include <asm/tlbflush.h>
 15
 16void pgd_init(unsigned long page)
 17{
 18	unsigned long *p, *end;
 19	unsigned long entry;
 20
 21#ifdef __PAGETABLE_PMD_FOLDED
 22	entry = (unsigned long)invalid_pte_table;
 23#else
 24	entry = (unsigned long)invalid_pmd_table;
 25#endif
 26
 27	p = (unsigned long *) page;
 28	end = p + PTRS_PER_PGD;
 29
 30	do {
 31		p[0] = entry;
 32		p[1] = entry;
 33		p[2] = entry;
 34		p[3] = entry;
 35		p[4] = entry;
 
 
 
 36		p += 8;
 37		p[-3] = entry;
 38		p[-2] = entry;
 39		p[-1] = entry;
 40	} while (p != end);
 41}
 42
 43#ifndef __PAGETABLE_PMD_FOLDED
 44void pmd_init(unsigned long addr, unsigned long pagetable)
 45{
 46	unsigned long *p, *end;
 47
 48	p = (unsigned long *) addr;
 49	end = p + PTRS_PER_PMD;
 50
 51	do {
 52		p[0] = pagetable;
 53		p[1] = pagetable;
 54		p[2] = pagetable;
 55		p[3] = pagetable;
 56		p[4] = pagetable;
 
 
 
 57		p += 8;
 58		p[-3] = pagetable;
 59		p[-2] = pagetable;
 60		p[-1] = pagetable;
 61	} while (p != end);
 62}
 63#endif
 64
 65#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 66
 67void pmdp_splitting_flush(struct vm_area_struct *vma,
 68			 unsigned long address,
 69			 pmd_t *pmdp)
 70{
 71	if (!pmd_trans_splitting(*pmdp)) {
 72		pmd_t pmd = pmd_mksplitting(*pmdp);
 73		set_pmd_at(vma->vm_mm, address, pmdp, pmd);
 74	}
 75}
 76
 77#endif
 78
 79pmd_t mk_pmd(struct page *page, pgprot_t prot)
 80{
 81	pmd_t pmd;
 82
 83	pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
 84
 85	return pmd;
 86}
 87
 88void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 89		pmd_t *pmdp, pmd_t pmd)
 90{
 91	*pmdp = pmd;
 92	flush_tlb_all();
 93}
 94
 95void __init pagetable_init(void)
 96{
 97	unsigned long vaddr;
 98	pgd_t *pgd_base;
 99
100	/* Initialize the entire pgd.  */
101	pgd_init((unsigned long)swapper_pg_dir);
102#ifndef __PAGETABLE_PMD_FOLDED
103	pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
104#endif
105	pgd_base = swapper_pg_dir;
106	/*
107	 * Fixed mappings:
108	 */
109	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
110	fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
111}