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Commit | Line | Data |
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b00dc837 | 1 | /* |
1da177e4 LT |
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 | ||
c4bce90e | 42 | entry = mk_pte_io(offset, prot, space, PAGE_SIZE); |
1da177e4 | 43 | if (!(address & 0xffff)) { |
c4bce90e DM |
44 | if (PAGE_SIZE < (4 * 1024 * 1024) && |
45 | !(address & 0x3fffff) && | |
46 | !(offset & 0x3ffffe) && | |
47 | end >= address + 0x400000) { | |
48 | entry = mk_pte_io(offset, prot, space, | |
49 | 4 * 1024 * 1024); | |
1da177e4 LT |
50 | curend = address + 0x400000; |
51 | offset += 0x400000; | |
c4bce90e DM |
52 | } else if (PAGE_SIZE < (512 * 1024) && |
53 | !(address & 0x7ffff) && | |
54 | !(offset & 0x7fffe) && | |
55 | end >= address + 0x80000) { | |
56 | entry = mk_pte_io(offset, prot, space, | |
57 | 512 * 1024 * 1024); | |
1da177e4 LT |
58 | curend = address + 0x80000; |
59 | offset += 0x80000; | |
c4bce90e DM |
60 | } else if (PAGE_SIZE < (64 * 1024) && |
61 | !(offset & 0xfffe) && | |
62 | end >= address + 0x10000) { | |
63 | entry = mk_pte_io(offset, prot, space, | |
64 | 64 * 1024); | |
1da177e4 LT |
65 | curend = address + 0x10000; |
66 | offset += 0x10000; | |
67 | } else | |
68 | offset += PAGE_SIZE; | |
69 | } else | |
70 | offset += PAGE_SIZE; | |
71 | ||
47f2c360 DM |
72 | if (pte_write(entry)) |
73 | entry = pte_mkdirty(entry); | |
1da177e4 LT |
74 | do { |
75 | BUG_ON(!pte_none(*pte)); | |
76 | set_pte_at(mm, address, pte, entry); | |
77 | address += PAGE_SIZE; | |
cab3f16f | 78 | pte_val(entry) += PAGE_SIZE; |
1da177e4 LT |
79 | pte++; |
80 | } while (address < curend); | |
81 | } while (address < end); | |
82 | } | |
83 | ||
84 | static inline int io_remap_pmd_range(struct mm_struct *mm, pmd_t * pmd, unsigned long address, unsigned long size, | |
85 | unsigned long offset, pgprot_t prot, int space) | |
86 | { | |
87 | unsigned long end; | |
88 | ||
89 | address &= ~PGDIR_MASK; | |
90 | end = address + size; | |
91 | if (end > PGDIR_SIZE) | |
92 | end = PGDIR_SIZE; | |
93 | offset -= address; | |
94 | do { | |
95 | pte_t * pte = pte_alloc_map(mm, pmd, address); | |
96 | if (!pte) | |
97 | return -ENOMEM; | |
98 | io_remap_pte_range(mm, pte, address, end - address, address + offset, prot, space); | |
99 | pte_unmap(pte); | |
100 | address = (address + PMD_SIZE) & PMD_MASK; | |
101 | pmd++; | |
102 | } while (address < end); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static inline int io_remap_pud_range(struct mm_struct *mm, pud_t * pud, unsigned long address, unsigned long size, | |
107 | unsigned long offset, pgprot_t prot, int space) | |
108 | { | |
109 | unsigned long end; | |
110 | ||
111 | address &= ~PUD_MASK; | |
112 | end = address + size; | |
113 | if (end > PUD_SIZE) | |
114 | end = PUD_SIZE; | |
115 | offset -= address; | |
116 | do { | |
117 | pmd_t *pmd = pmd_alloc(mm, pud, address); | |
118 | if (!pud) | |
119 | return -ENOMEM; | |
120 | io_remap_pmd_range(mm, pmd, address, end - address, address + offset, prot, space); | |
121 | address = (address + PUD_SIZE) & PUD_MASK; | |
122 | pud++; | |
123 | } while (address < end); | |
124 | return 0; | |
125 | } | |
126 | ||
1da177e4 LT |
127 | int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, |
128 | unsigned long pfn, unsigned long size, pgprot_t prot) | |
129 | { | |
130 | int error = 0; | |
131 | pgd_t * dir; | |
132 | unsigned long beg = from; | |
133 | unsigned long end = from + size; | |
134 | struct mm_struct *mm = vma->vm_mm; | |
135 | int space = GET_IOSPACE(pfn); | |
136 | unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT; | |
5cd9194a DM |
137 | unsigned long phys_base; |
138 | ||
139 | phys_base = offset | (((unsigned long) space) << 32UL); | |
1da177e4 | 140 | |
b5810039 | 141 | /* See comment in mm/memory.c remap_pfn_range */ |
5cd9194a DM |
142 | vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; |
143 | vma->vm_pgoff = phys_base >> PAGE_SHIFT; | |
b5810039 | 144 | |
1da177e4 LT |
145 | offset -= from; |
146 | dir = pgd_offset(mm, from); | |
147 | flush_cache_range(vma, beg, end); | |
148 | ||
1da177e4 | 149 | while (from < end) { |
b462705a | 150 | pud_t *pud = pud_alloc(mm, dir, from); |
1da177e4 LT |
151 | error = -ENOMEM; |
152 | if (!pud) | |
153 | break; | |
154 | error = io_remap_pud_range(mm, pud, from, end - from, offset + from, prot, space); | |
155 | if (error) | |
156 | break; | |
157 | from = (from + PGDIR_SIZE) & PGDIR_MASK; | |
158 | dir++; | |
159 | } | |
1da177e4 | 160 | |
b462705a | 161 | flush_tlb_range(vma, beg, end); |
1da177e4 LT |
162 | return error; |
163 | } |