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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
5bba49f5 VG |
2 | /* |
3 | * ARC700 mmap | |
4 | * | |
5 | * (started from arm version - for VIPT alias handling) | |
6 | * | |
7 | * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com) | |
5bba49f5 VG |
8 | */ |
9 | ||
10 | #include <linux/fs.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/mman.h> | |
01042607 IM |
13 | #include <linux/sched/mm.h> |
14 | ||
5bba49f5 VG |
15 | #include <asm/cacheflush.h> |
16 | ||
17 | #define COLOUR_ALIGN(addr, pgoff) \ | |
18 | ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \ | |
19 | (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1))) | |
20 | ||
21 | /* | |
22 | * Ensure that shared mappings are correctly aligned to | |
23 | * avoid aliasing issues with VIPT caches. | |
24 | * We need to ensure that | |
25 | * a specific page of an object is always mapped at a multiple of | |
26 | * SHMLBA bytes. | |
27 | */ | |
28 | unsigned long | |
29 | arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
30 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
31 | { | |
32 | struct mm_struct *mm = current->mm; | |
33 | struct vm_area_struct *vma; | |
34 | int do_align = 0; | |
35 | int aliasing = cache_is_vipt_aliasing(); | |
36 | struct vm_unmapped_area_info info; | |
37 | ||
38 | /* | |
39 | * We only need to do colour alignment if D cache aliases. | |
40 | */ | |
41 | if (aliasing) | |
42 | do_align = filp || (flags & MAP_SHARED); | |
43 | ||
44 | /* | |
45 | * We enforce the MAP_FIXED case. | |
46 | */ | |
47 | if (flags & MAP_FIXED) { | |
48 | if (aliasing && flags & MAP_SHARED && | |
49 | (addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)) | |
50 | return -EINVAL; | |
51 | return addr; | |
52 | } | |
53 | ||
54 | if (len > TASK_SIZE) | |
55 | return -ENOMEM; | |
56 | ||
57 | if (addr) { | |
58 | if (do_align) | |
59 | addr = COLOUR_ALIGN(addr, pgoff); | |
60 | else | |
61 | addr = PAGE_ALIGN(addr); | |
62 | ||
63 | vma = find_vma(mm, addr); | |
64 | if (TASK_SIZE - len >= addr && | |
1be7107f | 65 | (!vma || addr + len <= vm_start_gap(vma))) |
5bba49f5 VG |
66 | return addr; |
67 | } | |
68 | ||
69 | info.flags = 0; | |
70 | info.length = len; | |
71 | info.low_limit = mm->mmap_base; | |
72 | info.high_limit = TASK_SIZE; | |
73 | info.align_mask = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; | |
74 | info.align_offset = pgoff << PAGE_SHIFT; | |
75 | return vm_unmapped_area(&info); | |
76 | } |