1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * Based on arch/arm/mm/mmap.c
4 *
5 * Copyright (C) 2012 ARM Ltd.
6 */
7
8 #include <linux/io.h>
9 #include <linux/memblock.h>
10 #include <linux/mm.h>
11 #include <linux/types.h>
12
13 #include <asm/cpufeature.h>
14 #include <asm/page.h>
15
16 static pgprot_t protection_map[16] __ro_after_
17 [VM_NONE]
18 [VM_READ]
19 [VM_WRITE]
20 [VM_WRITE | VM_READ]
21 /* PAGE_EXECONLY if Enhanced PAN */
22 [VM_EXEC]
23 [VM_EXEC | VM_READ]
24 [VM_EXEC | VM_WRITE]
25 [VM_EXEC | VM_WRITE | VM_READ]
26 [VM_SHARED]
27 [VM_SHARED | VM_READ]
28 [VM_SHARED | VM_WRITE]
29 [VM_SHARED | VM_WRITE | VM_READ]
30 /* PAGE_EXECONLY if Enhanced PAN */
31 [VM_SHARED | VM_EXEC]
32 [VM_SHARED | VM_EXEC | VM_READ]
33 [VM_SHARED | VM_EXEC | VM_WRITE]
34 [VM_SHARED | VM_EXEC | VM_WRITE | VM_R
35 };
36
37 /*
38 * You really shouldn't be using read() or wri
39 * away in the future.
40 */
41 int valid_phys_addr_range(phys_addr_t addr, si
42 {
43 /*
44 * Check whether addr is covered by a
45 * MEMBLOCK_NOMAP attribute, and wheth
46 * entire range. In theory, this could
47 * if the range is covered by distinct
48 * that only differ in other attribute
49 * attributes have been defined, and i
50 * follows that /dev/mem read() calls
51 * such boundaries.
52 */
53 return memblock_is_region_memory(addr,
54 memblock_is_map_memory(addr);
55 }
56
57 /*
58 * Do not allow /dev/mem mappings beyond the s
59 */
60 int valid_mmap_phys_addr_range(unsigned long p
61 {
62 return !(((pfn << PAGE_SHIFT) + size)
63 }
64
65 static int __init adjust_protection_map(void)
66 {
67 /*
68 * With Enhanced PAN we can honour the
69 * there is no PAN override with such
70 */
71 if (cpus_have_cap(ARM64_HAS_EPAN)) {
72 protection_map[VM_EXEC] = PAGE
73 protection_map[VM_EXEC | VM_SH
74 }
75
76 if (lpa2_is_enabled())
77 for (int i = 0; i < ARRAY_SIZE
78 pgprot_val(protection_
79
80 return 0;
81 }
82 arch_initcall(adjust_protection_map);
83
84 pgprot_t vm_get_page_prot(unsigned long vm_fla
85 {
86 pteval_t prot = pgprot_val(protection_
87 (VM_READ|VM
88
89 if (vm_flags & VM_ARM64_BTI)
90 prot |= PTE_GP;
91
92 /*
93 * There are two conditions required f
94 * memory type: (1) the user requested
95 * mmap() or mprotect() and (2) the co
96 * register (1) as VM_MTE in the vma->
97 * VM_MTE_ALLOWED. Note that the latte
98 * mmap() call since mprotect() does n
99 * Checking for VM_MTE only is suffici
100 * does not permit (VM_MTE & !VM_MTE_A
101 */
102 if (vm_flags & VM_MTE)
103 prot |= PTE_ATTRINDX(MT_NORMAL
104
105 #ifdef CONFIG_ARCH_HAS_PKEYS
106 if (system_supports_poe()) {
107 if (vm_flags & VM_PKEY_BIT0)
108 prot |= PTE_PO_IDX_0;
109 if (vm_flags & VM_PKEY_BIT1)
110 prot |= PTE_PO_IDX_1;
111 if (vm_flags & VM_PKEY_BIT2)
112 prot |= PTE_PO_IDX_2;
113 }
114 #endif
115
116 return __pgprot(prot);
117 }
118 EXPORT_SYMBOL(vm_get_page_prot);
119
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