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Diffstat (limited to 'userspace/units/posix-env/posix-env.c')
-rw-r--r-- | userspace/units/posix-env/posix-env.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/userspace/units/posix-env/posix-env.c b/userspace/units/posix-env/posix-env.c new file mode 100644 index 00000000..fc090352 --- /dev/null +++ b/userspace/units/posix-env/posix-env.c | |||
@@ -0,0 +1,198 @@ | |||
1 | /* | ||
2 | * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved. | ||
3 | * | ||
4 | * Permission is hereby granted, free of charge, to any person obtaining a | ||
5 | * copy of this software and associated documentation files (the "Software"), | ||
6 | * to deal in the Software without restriction, including without limitation | ||
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | ||
8 | * and/or sell copies of the Software, and to permit persons to whom the | ||
9 | * Software is furnished to do so, subject to the following conditions: | ||
10 | * | ||
11 | * The above copyright notice and this permission notice shall be included in | ||
12 | * all copies or substantial portions of the Software. | ||
13 | * | ||
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
17 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
19 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
20 | * DEALINGS IN THE SOFTWARE. | ||
21 | */ | ||
22 | |||
23 | #include <stdlib.h> | ||
24 | #include <stdint.h> | ||
25 | |||
26 | #include <unit/io.h> | ||
27 | #include <unit/unit.h> | ||
28 | |||
29 | #include <nvgpu/types.h> | ||
30 | |||
31 | /* | ||
32 | * Test if the passed type is signed. In the signed case this expression becomes | ||
33 | * | ||
34 | * x = 0; | ||
35 | * y = x - 1 = -1 | ||
36 | * | ||
37 | * And -1 < 0 will be true. In the unsigned case, we rely on wrap around. We | ||
38 | * have the following | ||
39 | * | ||
40 | * x = 0U | ||
41 | * y = x - 1 = ~0 (i.e <TYPE>_MAX) | ||
42 | * | ||
43 | * Thus the expression y < x is false. | ||
44 | */ | ||
45 | #define IS_SIGNED_TYPE(__type__) \ | ||
46 | ({ \ | ||
47 | __type__ x = (__type__)0; \ | ||
48 | __type__ y = x - (__type__)1; \ | ||
49 | y < x; \ | ||
50 | }) | ||
51 | |||
52 | /* | ||
53 | * Ensure that our sized types are of the correct size. Assumes an 8bit byte of | ||
54 | * course. | ||
55 | */ | ||
56 | static int sanity_test_sizes(struct unit_module *m, | ||
57 | struct gk20a *g, void *args) | ||
58 | { | ||
59 | size_t size_u8 = sizeof(u8); | ||
60 | size_t size_u16 = sizeof(u16); | ||
61 | size_t size_u32 = sizeof(u32); | ||
62 | size_t size_u64 = sizeof(u64); | ||
63 | size_t size_s8 = sizeof(s8); | ||
64 | size_t size_s16 = sizeof(s16); | ||
65 | size_t size_s32 = sizeof(s32); | ||
66 | size_t size_s64 = sizeof(s64); | ||
67 | |||
68 | /* Unsigned. */ | ||
69 | if (size_u8 != 1U) | ||
70 | unit_return_fail(m, | ||
71 | "sizeof(u8) != 1 byte! (Actual size: %zu)\n", | ||
72 | size_u8); | ||
73 | if (size_u16 != 2U) | ||
74 | unit_return_fail(m, | ||
75 | "sizeof(u16) != 2 bytes! (Actual size: %zu)\n", | ||
76 | size_u16); | ||
77 | if (size_u32 != 4U) | ||
78 | unit_return_fail(m, | ||
79 | "sizeof(u32) != 4 bytes! (Actual size: %zu)\n", | ||
80 | size_u32); | ||
81 | if (size_u64 != 8U) | ||
82 | unit_return_fail(m, | ||
83 | "sizeof(u64) != 8 bytes! (Actual size: %zu)\n", | ||
84 | size_u64); | ||
85 | |||
86 | /* Signed. */ | ||
87 | if (size_s8 != 1U) | ||
88 | unit_return_fail(m, | ||
89 | "sizeof(s8) != 1 byte! (Actual size: %zu)\n", | ||
90 | size_s8); | ||
91 | if (size_s16 != 2U) | ||
92 | unit_return_fail(m, | ||
93 | "sizeof(s16) != 2 bytes! (Actual size: %zu)\n", | ||
94 | size_s16); | ||
95 | if (size_s32 != 4U) | ||
96 | unit_return_fail(m, | ||
97 | "sizeof(s32) != 4 bytes! (Actual size: %zu)\n", | ||
98 | size_s32); | ||
99 | if (size_s64 != 8U) | ||
100 | unit_return_fail(m, | ||
101 | "sizeof(s64) != 8 bytes! (Actual size: %zu)\n", | ||
102 | size_s64); | ||
103 | |||
104 | return UNIT_SUCCESS; | ||
105 | } | ||
106 | |||
107 | /* | ||
108 | * Make sure that the signed types really are signed and that the unsigned types | ||
109 | * really are not. | ||
110 | */ | ||
111 | static int sanity_test_signage(struct unit_module *m, | ||
112 | struct gk20a *g, void *args) | ||
113 | { | ||
114 | |||
115 | if (!IS_SIGNED_TYPE(s8)) | ||
116 | unit_return_fail(m, "s8 is not signed!\n"); | ||
117 | if (!IS_SIGNED_TYPE(s16)) | ||
118 | unit_return_fail(m, "s16 is not signed!\n"); | ||
119 | if (!IS_SIGNED_TYPE(s32)) | ||
120 | unit_return_fail(m, "s32 is not signed!\n"); | ||
121 | if (!IS_SIGNED_TYPE(s64)) | ||
122 | unit_return_fail(m, "s64 is not signed!\n"); | ||
123 | |||
124 | if (IS_SIGNED_TYPE(u8)) | ||
125 | unit_return_fail(m, "u8 is signed!\n"); | ||
126 | if (IS_SIGNED_TYPE(u16)) | ||
127 | unit_return_fail(m, "u16 is signed!\n"); | ||
128 | if (IS_SIGNED_TYPE(u32)) | ||
129 | unit_return_fail(m, "u32 is signed!\n"); | ||
130 | if (IS_SIGNED_TYPE(u64)) | ||
131 | unit_return_fail(m, "u64 is signed!\n"); | ||
132 | |||
133 | return UNIT_SUCCESS; | ||
134 | } | ||
135 | |||
136 | /* | ||
137 | * Ensure that a u64 can hold a pointer since in some places we use a u64 to | ||
138 | * pass back a pointer value. | ||
139 | */ | ||
140 | static int sanity_test_ptr_in_u64(struct unit_module *m, | ||
141 | struct gk20a *g, void *args) | ||
142 | { | ||
143 | if (sizeof(u64) < sizeof(uintptr_t)) | ||
144 | unit_return_fail(m, | ||
145 | "u64 size (%zu b) less than pointer size (%zu b)", | ||
146 | sizeof(u64), sizeof(uintptr_t)); | ||
147 | |||
148 | return UNIT_SUCCESS; | ||
149 | } | ||
150 | |||
151 | static int sanity_test_endianness(struct unit_module *m, | ||
152 | struct gk20a *g, void *args) | ||
153 | { | ||
154 | u32 i; | ||
155 | u32 x = 0x12345678; | ||
156 | u8 *ptr_x_u8 = (u8 *)&x; | ||
157 | u16 *ptr_x_u16 = (u16 *)&x; | ||
158 | |||
159 | /* | ||
160 | * Print what endianness we have. For now we have not explicitly decided | ||
161 | * to support one or the other, but this will have to be determined | ||
162 | * eventually. | ||
163 | * | ||
164 | * We have just been lucky so far. | ||
165 | */ | ||
166 | unit_info(m, "u32 x = 0x%x\n", x); | ||
167 | for (i = 0; i < sizeof(u32) / sizeof(u16); i++) { | ||
168 | unit_info(m, " &x + %zu: 0x%04hx\n", | ||
169 | i * sizeof(u16), ptr_x_u16[i]); | ||
170 | } | ||
171 | |||
172 | unit_info(m, "u32 x = 0x%x\n", x); | ||
173 | for (i = 0; i < sizeof(u32); i++) { | ||
174 | unit_info(m, " &x + %u: 0x%02hhx\n", i, ptr_x_u8[i]); | ||
175 | } | ||
176 | |||
177 | switch (ptr_x_u8[0]) { | ||
178 | case 0x12: | ||
179 | unit_info(m, "Machine endianness: big\n"); | ||
180 | break; | ||
181 | case 0x78: | ||
182 | unit_info(m, "Machine endianness: little\n"); | ||
183 | break; | ||
184 | default: | ||
185 | unit_return_fail(m, "Machine endianness: middle/unknown ??\n"); | ||
186 | } | ||
187 | |||
188 | return UNIT_SUCCESS; | ||
189 | } | ||
190 | |||
191 | struct unit_module_test posix_env_tests[] = { | ||
192 | UNIT_TEST(sizes, sanity_test_sizes, NULL), | ||
193 | UNIT_TEST(signage, sanity_test_signage, NULL), | ||
194 | UNIT_TEST(endianness, sanity_test_endianness, NULL), | ||
195 | UNIT_TEST(ptr_in_u64, sanity_test_ptr_in_u64, NULL), | ||
196 | }; | ||
197 | |||
198 | UNIT_MODULE(posix_env, posix_env_tests, UNIT_PRIO_POSIX_TEST); | ||