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/export.h>
10#include <linux/init.h>
11#include <linux/mm.h>
12#include <asm/fixmap.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#if !defined(__PAGETABLE_PUD_FOLDED)
22	entry = (unsigned long)invalid_pud_table;
23#elif !defined(__PAGETABLE_PMD_FOLDED)
24	entry = (unsigned long)invalid_pmd_table;
25#else
26	entry = (unsigned long)invalid_pte_table;
27#endif
28
29	p = (unsigned long *) page;
30	end = p + PTRS_PER_PGD;
31
32	do {
33		p[0] = entry;
34		p[1] = entry;
35		p[2] = entry;
36		p[3] = entry;
37		p[4] = entry;
38		p += 8;
39		p[-3] = entry;
40		p[-2] = entry;
41		p[-1] = entry;
42	} while (p != end);
43}
44
45#ifndef __PAGETABLE_PMD_FOLDED
46void pmd_init(unsigned long addr, unsigned long pagetable)
47{
48	unsigned long *p, *end;
49
50	p = (unsigned long *) addr;
51	end = p + PTRS_PER_PMD;
52
53	do {
54		p[0] = pagetable;
55		p[1] = pagetable;
56		p[2] = pagetable;
57		p[3] = pagetable;
58		p[4] = pagetable;
59		p += 8;
60		p[-3] = pagetable;
61		p[-2] = pagetable;
62		p[-1] = pagetable;
63	} while (p != end);
64}
65EXPORT_SYMBOL_GPL(pmd_init);
66#endif
67
68#ifndef __PAGETABLE_PUD_FOLDED
69void pud_init(unsigned long addr, unsigned long pagetable)
70{
71	unsigned long *p, *end;
72
73	p = (unsigned long *)addr;
74	end = p + PTRS_PER_PUD;
75
76	do {
77		p[0] = pagetable;
78		p[1] = pagetable;
79		p[2] = pagetable;
80		p[3] = pagetable;
81		p[4] = pagetable;
82		p += 8;
83		p[-3] = pagetable;
84		p[-2] = pagetable;
85		p[-1] = pagetable;
86	} while (p != end);
87}
88#endif
89
90pmd_t mk_pmd(struct page *page, pgprot_t prot)
91{
92	pmd_t pmd;
93
94	pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
95
96	return pmd;
97}
98
99void set_pmd_at(struct mm_struct *mm, unsigned long addr,
100		pmd_t *pmdp, pmd_t pmd)
101{
102	*pmdp = pmd;
103	flush_tlb_all();
104}
105
106void __init pagetable_init(void)
107{
108	unsigned long vaddr;
109	pgd_t *pgd_base;
110
111	/* Initialize the entire pgd.  */
112	pgd_init((unsigned long)swapper_pg_dir);
113#ifndef __PAGETABLE_PUD_FOLDED
114	pud_init((unsigned long)invalid_pud_table, (unsigned long)invalid_pmd_table);
115#endif
116#ifndef __PAGETABLE_PMD_FOLDED
117	pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
118#endif
119	pgd_base = swapper_pg_dir;
120	/*
121	 * Fixed mappings:
122	 */
123	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
124	fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
125}
126