1 | /* Copyright JS Foundation and other contributors, http://js.foundation |
2 | * |
3 | * Licensed under the Apache License, Version 2.0 (the "License"); |
4 | * you may not use this file except in compliance with the License. |
5 | * You may obtain a copy of the License at |
6 | * |
7 | * http://www.apache.org/licenses/LICENSE-2.0 |
8 | * |
9 | * Unless required by applicable law or agreed to in writing, software |
10 | * distributed under the License is distributed on an "AS IS" BASIS |
11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 | * See the License for the specific language governing permissions and |
13 | * limitations under the License. |
14 | */ |
15 | |
16 | #ifndef JRT_BIT_FIELDS_H |
17 | #define JRT_BIT_FIELDS_H |
18 | |
19 | /** |
20 | * Extract a bit-field. |
21 | * |
22 | * @param type type of container |
23 | * @param container container to extract bit-field from |
24 | * @param lsb least significant bit of the value to be extracted |
25 | * @param width width of the bit-field to be extracted |
26 | * @return bit-field's value |
27 | */ |
28 | #define (type, container, lsb, width) \ |
29 | (((container) >> lsb) & ((((type) 1) << (width)) - 1)) |
30 | |
31 | /** |
32 | * Set a bit-field. |
33 | * |
34 | * @param type type of container |
35 | * @param container container to insert bit-field to |
36 | * @param new_bit_field_value value of bit-field to insert |
37 | * @param lsb least significant bit of the value to be inserted |
38 | * @param width width of the bit-field to be inserted |
39 | * @return bit-field's value |
40 | */ |
41 | #define JRT_SET_BIT_FIELD_VALUE(type, container, new_bit_field_value, lsb, width) \ |
42 | (((container) & ~(((((type) 1) << (width)) - 1) << (lsb))) | (((type) new_bit_field_value) << (lsb))) |
43 | |
44 | #endif /* !JRT_BIT_FIELDS_H */ |
45 | |