xref: /linux/arch/mips/mm/pgtable-64.c (revision f9bff0e31881d03badf191d3b0005839391f5f2b)
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 
16 void pgd_init(void *addr)
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 *) addr;
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
46 void pmd_init(void *addr)
47 {
48 	unsigned long *p, *end;
49 	unsigned long pagetable = (unsigned long)invalid_pte_table;
50 
51 	p = (unsigned long *)addr;
52 	end = p + PTRS_PER_PMD;
53 
54 	do {
55 		p[0] = pagetable;
56 		p[1] = pagetable;
57 		p[2] = pagetable;
58 		p[3] = pagetable;
59 		p[4] = pagetable;
60 		p += 8;
61 		p[-3] = pagetable;
62 		p[-2] = pagetable;
63 		p[-1] = pagetable;
64 	} while (p != end);
65 }
66 EXPORT_SYMBOL_GPL(pmd_init);
67 #endif
68 
69 #ifndef __PAGETABLE_PUD_FOLDED
70 void pud_init(void *addr)
71 {
72 	unsigned long *p, *end;
73 	unsigned long pagetable = (unsigned long)invalid_pmd_table;
74 
75 	p = (unsigned long *)addr;
76 	end = p + PTRS_PER_PUD;
77 
78 	do {
79 		p[0] = pagetable;
80 		p[1] = pagetable;
81 		p[2] = pagetable;
82 		p[3] = pagetable;
83 		p[4] = pagetable;
84 		p += 8;
85 		p[-3] = pagetable;
86 		p[-2] = pagetable;
87 		p[-1] = pagetable;
88 	} while (p != end);
89 }
90 #endif
91 
92 pmd_t mk_pmd(struct page *page, pgprot_t prot)
93 {
94 	pmd_t pmd;
95 
96 	pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
97 
98 	return pmd;
99 }
100 
101 void set_pmd_at(struct mm_struct *mm, unsigned long addr,
102 		pmd_t *pmdp, pmd_t pmd)
103 {
104 	*pmdp = pmd;
105 }
106 
107 void __init pagetable_init(void)
108 {
109 	unsigned long vaddr;
110 	pgd_t *pgd_base;
111 
112 	/* Initialize the entire pgd.  */
113 	pgd_init(swapper_pg_dir);
114 #ifndef __PAGETABLE_PUD_FOLDED
115 	pud_init(invalid_pud_table);
116 #endif
117 #ifndef __PAGETABLE_PMD_FOLDED
118 	pmd_init(invalid_pmd_table);
119 #endif
120 	pgd_base = swapper_pg_dir;
121 	/*
122 	 * Fixed mappings:
123 	 */
124 	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
125 	fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
126 }
127