1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * ARC700 mmap
4 *
5 * (started from arm version - for VIPT alias
6 *
7 * Copyright (C) 2013 Synopsys, Inc. (www.syno
8 */
9
10 #include <linux/fs.h>
11 #include <linux/mm.h>
12 #include <linux/mman.h>
13 #include <linux/sched/mm.h>
14
15 #include <asm/cacheflush.h>
16
17 /*
18 * Ensure that shared mappings are correctly a
19 * avoid aliasing issues with VIPT caches.
20 * We need to ensure that
21 * a specific page of an object is always mapp
22 * SHMLBA bytes.
23 */
24 unsigned long
25 arch_get_unmapped_area(struct file *filp, unsi
26 unsigned long len, unsigned lo
27 unsigned long flags, vm_flags_
28 {
29 struct mm_struct *mm = current->mm;
30 struct vm_area_struct *vma;
31 struct vm_unmapped_area_info info = {}
32
33 /*
34 * We enforce the MAP_FIXED case.
35 */
36 if (flags & MAP_FIXED) {
37 if (flags & MAP_SHARED &&
38 (addr - (pgoff << PAGE_SHI
39 return -EINVAL;
40 return addr;
41 }
42
43 if (len > TASK_SIZE)
44 return -ENOMEM;
45
46 if (addr) {
47 addr = PAGE_ALIGN(addr);
48
49 vma = find_vma(mm, addr);
50 if (TASK_SIZE - len >= addr &&
51 (!vma || addr + len <= vm_
52 return addr;
53 }
54
55 info.length = len;
56 info.low_limit = mm->mmap_base;
57 info.high_limit = TASK_SIZE;
58 info.align_offset = pgoff << PAGE_SHIF
59 return vm_unmapped_area(&info);
60 }
61
62 static const pgprot_t protection_map[16] = {
63 [VM_NONE]
64 [VM_READ]
65 [VM_WRITE]
66 [VM_WRITE | VM_READ]
67 [VM_EXEC]
68 [VM_EXEC | VM_READ]
69 [VM_EXEC | VM_WRITE]
70 [VM_EXEC | VM_WRITE | VM_READ]
71 [VM_SHARED]
72 [VM_SHARED | VM_READ]
73 [VM_SHARED | VM_WRITE]
74 [VM_SHARED | VM_WRITE | VM_READ]
75 [VM_SHARED | VM_EXEC]
76 [VM_SHARED | VM_EXEC | VM_READ]
77 [VM_SHARED | VM_EXEC | VM_WRITE]
78 [VM_SHARED | VM_EXEC | VM_WRITE | VM_R
79 };
80 DECLARE_VM_GET_PAGE_PROT
81
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