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1da177e4 LT |
1 | /* $Id: generic.c,v 1.18 2001/12/21 04:56:15 davem Exp $ |
2 | * generic.c: Generic Sparc mm routines that are not dependent upon | |
3 | * MMU type but are Sparc specific. | |
4 | * | |
5 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
6 | */ | |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/mm.h> | |
10 | #include <linux/swap.h> | |
11 | #include <linux/pagemap.h> | |
12 | ||
13 | #include <asm/pgalloc.h> | |
14 | #include <asm/pgtable.h> | |
15 | #include <asm/page.h> | |
16 | #include <asm/tlbflush.h> | |
17 | ||
18 | /* Remap IO memory, the same way as remap_pfn_range(), but use | |
19 | * the obio memory space. | |
20 | * | |
21 | * They use a pgprot that sets PAGE_IO and does not check the | |
22 | * mem_map table as this is independent of normal memory. | |
23 | */ | |
24 | static inline void io_remap_pte_range(struct mm_struct *mm, pte_t * pte, | |
25 | unsigned long address, | |
26 | unsigned long size, | |
27 | unsigned long offset, pgprot_t prot, | |
28 | int space) | |
29 | { | |
30 | unsigned long end; | |
31 | ||
32 | /* clear hack bit that was used as a write_combine side-effect flag */ | |
33 | offset &= ~0x1UL; | |
34 | address &= ~PMD_MASK; | |
35 | end = address + size; | |
36 | if (end > PMD_SIZE) | |
37 | end = PMD_SIZE; | |
38 | do { | |
39 | pte_t entry; | |
40 | unsigned long curend = address + PAGE_SIZE; | |
41 | ||
42 | entry = mk_pte_io(offset, prot, space); | |
43 | if (!(address & 0xffff)) { | |
44 | if (!(address & 0x3fffff) && !(offset & 0x3ffffe) && end >= address + 0x400000) { | |
45 | entry = mk_pte_io(offset, | |
46 | __pgprot(pgprot_val (prot) | _PAGE_SZ4MB), | |
47 | space); | |
48 | curend = address + 0x400000; | |
49 | offset += 0x400000; | |
50 | } else if (!(address & 0x7ffff) && !(offset & 0x7fffe) && end >= address + 0x80000) { | |
51 | entry = mk_pte_io(offset, | |
52 | __pgprot(pgprot_val (prot) | _PAGE_SZ512K), | |
53 | space); | |
54 | curend = address + 0x80000; | |
55 | offset += 0x80000; | |
56 | } else if (!(offset & 0xfffe) && end >= address + 0x10000) { | |
57 | entry = mk_pte_io(offset, | |
58 | __pgprot(pgprot_val (prot) | _PAGE_SZ64K), | |
59 | space); | |
60 | curend = address + 0x10000; | |
61 | offset += 0x10000; | |
62 | } else | |
63 | offset += PAGE_SIZE; | |
64 | } else | |
65 | offset += PAGE_SIZE; | |
66 | ||
67 | do { | |
68 | BUG_ON(!pte_none(*pte)); | |
69 | set_pte_at(mm, address, pte, entry); | |
70 | address += PAGE_SIZE; | |
71 | pte++; | |
72 | } while (address < curend); | |
73 | } while (address < end); | |
74 | } | |
75 | ||
76 | static inline int io_remap_pmd_range(struct mm_struct *mm, pmd_t * pmd, unsigned long address, unsigned long size, | |
77 | unsigned long offset, pgprot_t prot, int space) | |
78 | { | |
79 | unsigned long end; | |
80 | ||
81 | address &= ~PGDIR_MASK; | |
82 | end = address + size; | |
83 | if (end > PGDIR_SIZE) | |
84 | end = PGDIR_SIZE; | |
85 | offset -= address; | |
86 | do { | |
87 | pte_t * pte = pte_alloc_map(mm, pmd, address); | |
88 | if (!pte) | |
89 | return -ENOMEM; | |
90 | io_remap_pte_range(mm, pte, address, end - address, address + offset, prot, space); | |
91 | pte_unmap(pte); | |
92 | address = (address + PMD_SIZE) & PMD_MASK; | |
93 | pmd++; | |
94 | } while (address < end); | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static inline int io_remap_pud_range(struct mm_struct *mm, pud_t * pud, unsigned long address, unsigned long size, | |
99 | unsigned long offset, pgprot_t prot, int space) | |
100 | { | |
101 | unsigned long end; | |
102 | ||
103 | address &= ~PUD_MASK; | |
104 | end = address + size; | |
105 | if (end > PUD_SIZE) | |
106 | end = PUD_SIZE; | |
107 | offset -= address; | |
108 | do { | |
109 | pmd_t *pmd = pmd_alloc(mm, pud, address); | |
110 | if (!pud) | |
111 | return -ENOMEM; | |
112 | io_remap_pmd_range(mm, pmd, address, end - address, address + offset, prot, space); | |
113 | address = (address + PUD_SIZE) & PUD_MASK; | |
114 | pud++; | |
115 | } while (address < end); | |
116 | return 0; | |
117 | } | |
118 | ||
1da177e4 LT |
119 | int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, |
120 | unsigned long pfn, unsigned long size, pgprot_t prot) | |
121 | { | |
122 | int error = 0; | |
123 | pgd_t * dir; | |
124 | unsigned long beg = from; | |
125 | unsigned long end = from + size; | |
126 | struct mm_struct *mm = vma->vm_mm; | |
127 | int space = GET_IOSPACE(pfn); | |
128 | unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT; | |
129 | ||
b5810039 NP |
130 | /* See comment in mm/memory.c remap_pfn_range */ |
131 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
132 | ||
1da177e4 LT |
133 | prot = __pgprot(pg_iobits); |
134 | offset -= from; | |
135 | dir = pgd_offset(mm, from); | |
136 | flush_cache_range(vma, beg, end); | |
137 | ||
138 | spin_lock(&mm->page_table_lock); | |
139 | while (from < end) { | |
140 | pud_t *pud = pud_alloc(current->mm, dir, from); | |
141 | error = -ENOMEM; | |
142 | if (!pud) | |
143 | break; | |
144 | error = io_remap_pud_range(mm, pud, from, end - from, offset + from, prot, space); | |
145 | if (error) | |
146 | break; | |
147 | from = (from + PGDIR_SIZE) & PGDIR_MASK; | |
148 | dir++; | |
149 | } | |
150 | flush_tlb_range(vma, beg, end); | |
151 | spin_unlock(&mm->page_table_lock); | |
152 | ||
153 | return error; | |
154 | } |