1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * Copyright (C) 2011 Richard Weinberger <rich
4 */
5
6 #include <linux/mm.h>
7 #include <asm/elf.h>
8
9 static struct vm_area_struct gate_vma;
10
11 static int __init gate_vma_init(void)
12 {
13 if (!FIXADDR_USER_START)
14 return 0;
15
16 vma_init(&gate_vma, NULL);
17 gate_vma.vm_start = FIXADDR_USER_START
18 gate_vma.vm_end = FIXADDR_USER_END;
19 vm_flags_init(&gate_vma, VM_READ | VM_
20 gate_vma.vm_page_prot = PAGE_READONLY;
21
22 return 0;
23 }
24 __initcall(gate_vma_init);
25
26 struct vm_area_struct *get_gate_vma(struct mm_
27 {
28 return FIXADDR_USER_START ? &gate_vma
29 }
30
31 int in_gate_area_no_mm(unsigned long addr)
32 {
33 if (!FIXADDR_USER_START)
34 return 0;
35
36 if ((addr >= FIXADDR_USER_START) && (a
37 return 1;
38
39 return 0;
40 }
41
42 int in_gate_area(struct mm_struct *mm, unsigne
43 {
44 struct vm_area_struct *vma = get_gate_
45
46 if (!vma)
47 return 0;
48
49 return (addr >= vma->vm_start) && (add
50 }
51
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