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1 | /* |
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/cacheflush.h> |
17 | #include <asm/tlbflush.h> |
18 | |
19 | /* Remap IO memory, the same way as remap_pfn_range(), but use |
20 | * the obio memory space. |
21 | * |
22 | * They use a pgprot that sets PAGE_IO and does not check the |
23 | * mem_map table as this is independent of normal memory. |
24 | */ |
25 | static inline void io_remap_pte_range(struct mm_struct *mm, pte_t * pte, unsigned long address, unsigned long size, |
26 | unsigned long offset, pgprot_t prot, int space) |
27 | { |
28 | unsigned long end; |
29 | |
30 | address &= ~PMD_MASK; |
31 | end = address + size; |
32 | if (end > PMD_SIZE) |
33 | end = PMD_SIZE; |
34 | do { |
35 | set_pte_at(mm, address, pte, mk_pte_io(offset, prot, space)); |
36 | address += PAGE_SIZE; |
37 | offset += PAGE_SIZE; |
38 | pte++; |
39 | } while (address < end); |
40 | } |
41 | |
42 | static inline int io_remap_pmd_range(struct mm_struct *mm, pmd_t * pmd, unsigned long address, unsigned long size, |
43 | unsigned long offset, pgprot_t prot, int space) |
44 | { |
45 | unsigned long end; |
46 | |
47 | address &= ~PGDIR_MASK; |
48 | end = address + size; |
49 | if (end > PGDIR_SIZE) |
50 | end = PGDIR_SIZE; |
51 | offset -= address; |
52 | do { |
53 | pte_t * pte = pte_alloc_map(mm, pmd, address); |
54 | if (!pte) |
55 | return -ENOMEM; |
56 | io_remap_pte_range(mm, pte, address, end - address, address + offset, prot, space); |
57 | address = (address + PMD_SIZE) & PMD_MASK; |
58 | pmd++; |
59 | } while (address < end); |
60 | return 0; |
61 | } |
62 | |
63 | int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, |
64 | unsigned long pfn, unsigned long size, pgprot_t prot) |
65 | { |
66 | int error = 0; |
67 | pgd_t * dir; |
68 | unsigned long beg = from; |
69 | unsigned long end = from + size; |
70 | struct mm_struct *mm = vma->vm_mm; |
71 | int space = GET_IOSPACE(pfn); |
72 | unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT; |
73 | |
74 | /* See comment in mm/memory.c remap_pfn_range */ |
75 | vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; |
76 | vma->vm_pgoff = (offset >> PAGE_SHIFT) | |
77 | ((unsigned long)space << 28UL); |
78 | |
79 | offset -= from; |
80 | dir = pgd_offset(mm, from); |
81 | flush_cache_range(vma, beg, end); |
82 | |
83 | while (from < end) { |
84 | pmd_t *pmd = pmd_alloc(mm, dir, from); |
85 | error = -ENOMEM; |
86 | if (!pmd) |
87 | break; |
88 | error = io_remap_pmd_range(mm, pmd, from, end - from, offset + from, prot, space); |
89 | if (error) |
90 | break; |
91 | from = (from + PGDIR_SIZE) & PGDIR_MASK; |
92 | dir++; |
93 | } |
94 | |
95 | flush_tlb_range(vma, beg, end); |
96 | return error; |
97 | } |
98 | EXPORT_SYMBOL(io_remap_pfn_range); |
99 |
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