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.h>
17#include <asm/cacheflush.h>
18
19#define COLOUR_ALIGN(addr, pgoff)			\
20	((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) +	\
21	 (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1)))
22
23/*
24 * Ensure that shared mappings are correctly aligned to
25 * avoid aliasing issues with VIPT caches.
26 * We need to ensure that
27 * a specific page of an object is always mapped at a multiple of
28 * SHMLBA bytes.
29 */
30unsigned long
31arch_get_unmapped_area(struct file *filp, unsigned long addr,
32		unsigned long len, unsigned long pgoff, unsigned long flags)
 
33{
34	struct mm_struct *mm = current->mm;
35	struct vm_area_struct *vma;
36	int do_align = 0;
37	int aliasing = cache_is_vipt_aliasing();
38	struct vm_unmapped_area_info info;
39
40	/*
41	 * We only need to do colour alignment if D cache aliases.
42	 */
43	if (aliasing)
44		do_align = filp || (flags & MAP_SHARED);
45
46	/*
47	 * We enforce the MAP_FIXED case.
48	 */
49	if (flags & MAP_FIXED) {
50		if (aliasing && flags & MAP_SHARED &&
51		    (addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))
52			return -EINVAL;
53		return addr;
54	}
55
56	if (len > TASK_SIZE)
57		return -ENOMEM;
58
59	if (addr) {
60		if (do_align)
61			addr = COLOUR_ALIGN(addr, pgoff);
62		else
63			addr = PAGE_ALIGN(addr);
64
65		vma = find_vma(mm, addr);
66		if (TASK_SIZE - len >= addr &&
67		    (!vma || addr + len <= vma->vm_start))
68			return addr;
69	}
70
71	info.flags = 0;
72	info.length = len;
73	info.low_limit = mm->mmap_base;
74	info.high_limit = TASK_SIZE;
75	info.align_mask = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
76	info.align_offset = pgoff << PAGE_SHIFT;
77	return vm_unmapped_area(&info);
78}

 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