projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 548f0a4e RW |
1 | /* |
| 2 | * Copyright (C) 2011 Richard Weinberger <[email protected]> | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/mm.h> | |
| 10 | #include <asm/page.h> | |
| 11 | #include <asm/mman.h> | |
| 12 | ||
| 13 | static struct vm_area_struct gate_vma; | |
| 14 | ||
| 15 | static int __init gate_vma_init(void) | |
| 16 | { | |
| 17 | if (!FIXADDR_USER_START) | |
| 18 | return 0; | |
| 19 | ||
| 20 | gate_vma.vm_mm = NULL; | |
| 21 | gate_vma.vm_start = FIXADDR_USER_START; | |
| 22 | gate_vma.vm_end = FIXADDR_USER_END; | |
| 23 | gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC; | |
| 24 | gate_vma.vm_page_prot = __P101; | |
| 25 | ||
| 548f0a4e RW |
26 | return 0; |
| 27 | } | |
| 28 | __initcall(gate_vma_init); | |
| 29 | ||
| 30 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) | |
| 31 | { | |
| 32 | return FIXADDR_USER_START ? &gate_vma : NULL; | |
| 33 | } | |
| 34 | ||
| 35 | int in_gate_area_no_mm(unsigned long addr) | |
| 36 | { | |
| 37 | if (!FIXADDR_USER_START) | |
| 38 | return 0; | |
| 39 | ||
| 40 | if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END)) | |
| 41 | return 1; | |
| 42 | ||
| 43 | return 0; | |
| 44 | } | |
| 45 | ||
| 46 | int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
| 47 | { | |
| 48 | struct vm_area_struct *vma = get_gate_vma(mm); | |
| 49 | ||
| 50 | if (!vma) | |
| 51 | return 0; | |
| 52 | ||
| 53 | return (addr >= vma->vm_start) && (addr < vma->vm_end); | |
| 54 | } |