1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * ARC700 mmap
 4 *
 5 * (started from arm version - for VIPT alias handling)
 6 *
 7 * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
 
 
 
 
 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 aligned to
19 * avoid aliasing issues with VIPT caches.
20 * We need to ensure that
21 * a specific page of an object is always mapped at a multiple of
22 * SHMLBA bytes.
23 */
24unsigned long
25arch_get_unmapped_area(struct file *filp, unsigned long addr,
26		unsigned long len, unsigned long pgoff,
27		unsigned long flags, vm_flags_t 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_SHIFT)) & (SHMLBA - 1))
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_start_gap(vma)))
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_SHIFT;
59	return vm_unmapped_area(&info);
60}
61
62static const pgprot_t protection_map[16] = {
63	[VM_NONE]					= PAGE_U_NONE,
64	[VM_READ]					= PAGE_U_R,
65	[VM_WRITE]					= PAGE_U_R,
66	[VM_WRITE | VM_READ]				= PAGE_U_R,
67	[VM_EXEC]					= PAGE_U_X_R,
68	[VM_EXEC | VM_READ]				= PAGE_U_X_R,
69	[VM_EXEC | VM_WRITE]				= PAGE_U_X_R,
70	[VM_EXEC | VM_WRITE | VM_READ]			= PAGE_U_X_R,
71	[VM_SHARED]					= PAGE_U_NONE,
72	[VM_SHARED | VM_READ]				= PAGE_U_R,
73	[VM_SHARED | VM_WRITE]				= PAGE_U_W_R,
74	[VM_SHARED | VM_WRITE | VM_READ]		= PAGE_U_W_R,
75	[VM_SHARED | VM_EXEC]				= PAGE_U_X_R,
76	[VM_SHARED | VM_EXEC | VM_READ]			= PAGE_U_X_R,
77	[VM_SHARED | VM_EXEC | VM_WRITE]		= PAGE_U_X_W_R,
78	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= PAGE_U_X_W_R
79};
80DECLARE_VM_GET_PAGE_PROT

 
 1/*
 2 * ARC700 mmap
 3 *
 4 * (started from arm version - for VIPT alias handling)
 5 *
 6 * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
 7 *
 8 * This program is free software; you can redistribute it and/or modify
 9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/fs.h>
14#include <linux/mm.h>
15#include <linux/mman.h>
16#include <linux/sched/mm.h>
17
18#include <asm/cacheflush.h>
19
20#define COLOUR_ALIGN(addr, pgoff)			\
21	((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) +	\
22	 (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1)))
23
24/*
25 * Ensure that shared mappings are correctly aligned to
26 * avoid aliasing issues with VIPT caches.
27 * We need to ensure that
28 * a specific page of an object is always mapped at a multiple of
29 * SHMLBA bytes.
30 */
31unsigned long
32arch_get_unmapped_area(struct file *filp, unsigned long addr,
33		unsigned long len, unsigned long pgoff, unsigned long flags)
 
34{
35	struct mm_struct *mm = current->mm;
36	struct vm_area_struct *vma;
37	int do_align = 0;
38	int aliasing = cache_is_vipt_aliasing();
39	struct vm_unmapped_area_info info;
40
41	/*
42	 * We only need to do colour alignment if D cache aliases.
43	 */
44	if (aliasing)
45		do_align = filp || (flags & MAP_SHARED);
46
47	/*
48	 * We enforce the MAP_FIXED case.
49	 */
50	if (flags & MAP_FIXED) {
51		if (aliasing && flags & MAP_SHARED &&
52		    (addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))
53			return -EINVAL;
54		return addr;
55	}
56
57	if (len > TASK_SIZE)
58		return -ENOMEM;
59
60	if (addr) {
61		if (do_align)
62			addr = COLOUR_ALIGN(addr, pgoff);
63		else
64			addr = PAGE_ALIGN(addr);
65
66		vma = find_vma(mm, addr);
67		if (TASK_SIZE - len >= addr &&
68		    (!vma || addr + len <= vm_start_gap(vma)))
69			return addr;
70	}
71
72	info.flags = 0;
73	info.length = len;
74	info.low_limit = mm->mmap_base;
75	info.high_limit = TASK_SIZE;
76	info.align_mask = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
77	info.align_offset = pgoff << PAGE_SHIFT;
78	return vm_unmapped_area(&info);
79}