| // Copyright 2023 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| |
| #include "pw_interrupt/context.h" |
| |
| #include <xtensa/config/core.h> |
| #include <xtensa/hal.h> |
| |
| #include <cstdint> |
| |
| namespace pw::interrupt { |
| |
| bool InInterruptContext() { |
| // xthal_intlevel_get returns the current interrupt level of the processor |
| // (value of PS.INTLEVEL register). C based handlers are always dispatched |
| // from an interrupt level below XCHAL_EXCM_LEVEL - handlers running above |
| // this level must be written in assembly. The interrupt level is set to zero |
| // when interrupts are enabled but the core isn't currently procesing one. |
| const uint32_t int_level = xthal_intlevel_get(); |
| return (int_level < XCHAL_EXCM_LEVEL) && (int_level > 0); |
| } |
| |
| } // namespace pw::interrupt |
