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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
e754aedc DH |
2 | #ifndef _MPX_HW_H |
3 | #define _MPX_HW_H | |
4 | ||
5 | #include <assert.h> | |
6 | ||
7 | /* Describe the MPX Hardware Layout in here */ | |
8 | ||
9 | #define NR_MPX_BOUNDS_REGISTERS 4 | |
10 | ||
11 | #ifdef __i386__ | |
12 | ||
13 | #define MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES 16 /* 4 * 32-bits */ | |
14 | #define MPX_BOUNDS_TABLE_SIZE_BYTES (1ULL << 14) /* 16k */ | |
15 | #define MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES 4 | |
16 | #define MPX_BOUNDS_DIR_SIZE_BYTES (1ULL << 22) /* 4MB */ | |
17 | ||
18 | #define MPX_BOUNDS_TABLE_BOTTOM_BIT 2 | |
19 | #define MPX_BOUNDS_TABLE_TOP_BIT 11 | |
20 | #define MPX_BOUNDS_DIR_BOTTOM_BIT 12 | |
21 | #define MPX_BOUNDS_DIR_TOP_BIT 31 | |
22 | ||
23 | #else | |
24 | ||
25 | /* | |
26 | * Linear Address of "pointer" (LAp) | |
27 | * 0 -> 2: ignored | |
28 | * 3 -> 19: index in to bounds table | |
29 | * 20 -> 47: index in to bounds directory | |
30 | * 48 -> 63: ignored | |
31 | */ | |
32 | ||
33 | #define MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES 32 | |
34 | #define MPX_BOUNDS_TABLE_SIZE_BYTES (1ULL << 22) /* 4MB */ | |
35 | #define MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES 8 | |
36 | #define MPX_BOUNDS_DIR_SIZE_BYTES (1ULL << 31) /* 2GB */ | |
37 | ||
38 | #define MPX_BOUNDS_TABLE_BOTTOM_BIT 3 | |
39 | #define MPX_BOUNDS_TABLE_TOP_BIT 19 | |
40 | #define MPX_BOUNDS_DIR_BOTTOM_BIT 20 | |
41 | #define MPX_BOUNDS_DIR_TOP_BIT 47 | |
42 | ||
43 | #endif | |
44 | ||
45 | #define MPX_BOUNDS_DIR_NR_ENTRIES \ | |
46 | (MPX_BOUNDS_DIR_SIZE_BYTES/MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES) | |
47 | #define MPX_BOUNDS_TABLE_NR_ENTRIES \ | |
48 | (MPX_BOUNDS_TABLE_SIZE_BYTES/MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES) | |
49 | ||
50 | #define MPX_BOUNDS_TABLE_ENTRY_VALID_BIT 0x1 | |
51 | ||
52 | struct mpx_bd_entry { | |
53 | union { | |
54 | char x[MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES]; | |
55 | void *contents[1]; | |
56 | }; | |
57 | } __attribute__((packed)); | |
58 | ||
59 | struct mpx_bt_entry { | |
60 | union { | |
61 | char x[MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES]; | |
62 | unsigned long contents[1]; | |
63 | }; | |
64 | } __attribute__((packed)); | |
65 | ||
66 | struct mpx_bounds_dir { | |
67 | struct mpx_bd_entry entries[MPX_BOUNDS_DIR_NR_ENTRIES]; | |
68 | } __attribute__((packed)); | |
69 | ||
70 | struct mpx_bounds_table { | |
71 | struct mpx_bt_entry entries[MPX_BOUNDS_TABLE_NR_ENTRIES]; | |
72 | } __attribute__((packed)); | |
73 | ||
74 | static inline unsigned long GET_BITS(unsigned long val, int bottombit, int topbit) | |
75 | { | |
76 | int total_nr_bits = topbit - bottombit; | |
77 | unsigned long mask = (1UL << total_nr_bits)-1; | |
78 | return (val >> bottombit) & mask; | |
79 | } | |
80 | ||
81 | static inline unsigned long __vaddr_bounds_table_index(void *vaddr) | |
82 | { | |
83 | return GET_BITS((unsigned long)vaddr, MPX_BOUNDS_TABLE_BOTTOM_BIT, | |
84 | MPX_BOUNDS_TABLE_TOP_BIT); | |
85 | } | |
86 | ||
87 | static inline unsigned long __vaddr_bounds_directory_index(void *vaddr) | |
88 | { | |
89 | return GET_BITS((unsigned long)vaddr, MPX_BOUNDS_DIR_BOTTOM_BIT, | |
90 | MPX_BOUNDS_DIR_TOP_BIT); | |
91 | } | |
92 | ||
93 | static inline struct mpx_bd_entry *mpx_vaddr_to_bd_entry(void *vaddr, | |
94 | struct mpx_bounds_dir *bounds_dir) | |
95 | { | |
96 | unsigned long index = __vaddr_bounds_directory_index(vaddr); | |
97 | return &bounds_dir->entries[index]; | |
98 | } | |
99 | ||
100 | static inline int bd_entry_valid(struct mpx_bd_entry *bounds_dir_entry) | |
101 | { | |
102 | unsigned long __bd_entry = (unsigned long)bounds_dir_entry->contents; | |
103 | return (__bd_entry & MPX_BOUNDS_TABLE_ENTRY_VALID_BIT); | |
104 | } | |
105 | ||
106 | static inline struct mpx_bounds_table * | |
107 | __bd_entry_to_bounds_table(struct mpx_bd_entry *bounds_dir_entry) | |
108 | { | |
109 | unsigned long __bd_entry = (unsigned long)bounds_dir_entry->contents; | |
110 | assert(__bd_entry & MPX_BOUNDS_TABLE_ENTRY_VALID_BIT); | |
111 | __bd_entry &= ~MPX_BOUNDS_TABLE_ENTRY_VALID_BIT; | |
112 | return (struct mpx_bounds_table *)__bd_entry; | |
113 | } | |
114 | ||
115 | static inline struct mpx_bt_entry * | |
116 | mpx_vaddr_to_bt_entry(void *vaddr, struct mpx_bounds_dir *bounds_dir) | |
117 | { | |
118 | struct mpx_bd_entry *bde = mpx_vaddr_to_bd_entry(vaddr, bounds_dir); | |
119 | struct mpx_bounds_table *bt = __bd_entry_to_bounds_table(bde); | |
120 | unsigned long index = __vaddr_bounds_table_index(vaddr); | |
121 | return &bt->entries[index]; | |
122 | } | |
123 | ||
124 | #endif /* _MPX_HW_H */ |