diff options
author | Paul Mundt <lethal@linux-sh.org> | 2008-11-11 23:17:38 -0500 |
---|---|---|
committer | Paul Mundt <lethal@linux-sh.org> | 2008-12-22 04:42:49 -0500 |
commit | 4a4a9be3ebdbf17957d29e3521f328a1145f9431 (patch) | |
tree | 274a36403bd64a7e15a4f17408ef97a9d0bc6c18 /arch/sh/mm | |
parent | 3d44cc3e01ee1b40317f79ed54324e25c4f848df (diff) |
sh: Move arch_get_unmapped_area() in to arch/sh/mm/mmap.c.
Now that arch/sh/mm/mmap.c exists, move arch_get_unmapped_area() there.
Follows the ARM change.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm')
-rw-r--r-- | arch/sh/mm/mmap.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c index 8837d511710a..931f4d003fa0 100644 --- a/arch/sh/mm/mmap.c +++ b/arch/sh/mm/mmap.c | |||
@@ -9,7 +9,101 @@ | |||
9 | */ | 9 | */ |
10 | #include <linux/io.h> | 10 | #include <linux/io.h> |
11 | #include <linux/mm.h> | 11 | #include <linux/mm.h> |
12 | #include <linux/mman.h> | ||
13 | #include <linux/module.h> | ||
12 | #include <asm/page.h> | 14 | #include <asm/page.h> |
15 | #include <asm/processor.h> | ||
16 | |||
17 | #ifdef CONFIG_MMU | ||
18 | unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ | ||
19 | EXPORT_SYMBOL(shm_align_mask); | ||
20 | |||
21 | /* | ||
22 | * To avoid cache aliases, we map the shared page with same color. | ||
23 | */ | ||
24 | #define COLOUR_ALIGN(addr, pgoff) \ | ||
25 | ((((addr) + shm_align_mask) & ~shm_align_mask) + \ | ||
26 | (((pgoff) << PAGE_SHIFT) & shm_align_mask)) | ||
27 | |||
28 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | ||
29 | unsigned long len, unsigned long pgoff, unsigned long flags) | ||
30 | { | ||
31 | struct mm_struct *mm = current->mm; | ||
32 | struct vm_area_struct *vma; | ||
33 | unsigned long start_addr; | ||
34 | int do_colour_align; | ||
35 | |||
36 | if (flags & MAP_FIXED) { | ||
37 | /* We do not accept a shared mapping if it would violate | ||
38 | * cache aliasing constraints. | ||
39 | */ | ||
40 | if ((flags & MAP_SHARED) && (addr & shm_align_mask)) | ||
41 | return -EINVAL; | ||
42 | return addr; | ||
43 | } | ||
44 | |||
45 | if (unlikely(len > TASK_SIZE)) | ||
46 | return -ENOMEM; | ||
47 | |||
48 | do_colour_align = 0; | ||
49 | if (filp || (flags & MAP_SHARED)) | ||
50 | do_colour_align = 1; | ||
51 | |||
52 | if (addr) { | ||
53 | if (do_colour_align) | ||
54 | addr = COLOUR_ALIGN(addr, pgoff); | ||
55 | else | ||
56 | addr = PAGE_ALIGN(addr); | ||
57 | |||
58 | vma = find_vma(mm, addr); | ||
59 | if (TASK_SIZE - len >= addr && | ||
60 | (!vma || addr + len <= vma->vm_start)) | ||
61 | return addr; | ||
62 | } | ||
63 | |||
64 | if (len > mm->cached_hole_size) { | ||
65 | start_addr = addr = mm->free_area_cache; | ||
66 | } else { | ||
67 | mm->cached_hole_size = 0; | ||
68 | start_addr = addr = TASK_UNMAPPED_BASE; | ||
69 | } | ||
70 | |||
71 | full_search: | ||
72 | if (do_colour_align) | ||
73 | addr = COLOUR_ALIGN(addr, pgoff); | ||
74 | else | ||
75 | addr = PAGE_ALIGN(mm->free_area_cache); | ||
76 | |||
77 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { | ||
78 | /* At this point: (!vma || addr < vma->vm_end). */ | ||
79 | if (unlikely(TASK_SIZE - len < addr)) { | ||
80 | /* | ||
81 | * Start a new search - just in case we missed | ||
82 | * some holes. | ||
83 | */ | ||
84 | if (start_addr != TASK_UNMAPPED_BASE) { | ||
85 | start_addr = addr = TASK_UNMAPPED_BASE; | ||
86 | mm->cached_hole_size = 0; | ||
87 | goto full_search; | ||
88 | } | ||
89 | return -ENOMEM; | ||
90 | } | ||
91 | if (likely(!vma || addr + len <= vma->vm_start)) { | ||
92 | /* | ||
93 | * Remember the place where we stopped the search: | ||
94 | */ | ||
95 | mm->free_area_cache = addr + len; | ||
96 | return addr; | ||
97 | } | ||
98 | if (addr + mm->cached_hole_size < vma->vm_start) | ||
99 | mm->cached_hole_size = vma->vm_start - addr; | ||
100 | |||
101 | addr = vma->vm_end; | ||
102 | if (do_colour_align) | ||
103 | addr = COLOUR_ALIGN(addr, pgoff); | ||
104 | } | ||
105 | } | ||
106 | #endif /* CONFIG_MMU */ | ||
13 | 107 | ||
14 | /* | 108 | /* |
15 | * You really shouldn't be using read() or write() on /dev/mem. This | 109 | * You really shouldn't be using read() or write() on /dev/mem. This |