| // Copyright 2020 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. |
| #pragma once |
| |
| #include <cstdint> |
| |
| namespace pw::interrupt { |
| |
| #if defined(PW_INTERRUPT_CORTEX_M_ARMV6M) || \ |
| defined(PW_INTERRUPT_CORTEX_M_ARMV7M) || \ |
| defined(PW_INTERRUPT_CORTEX_M_ARMV8M) |
| inline bool InInterruptContext() { |
| // ARMv7M Reference manual section B1.4.2 describes how the Interrupt |
| // Program Status Register (IPSR) is zero if there is no exception (interrupt) |
| // being processed. |
| uint32_t ipsr; |
| asm volatile("MRS %0, ipsr" : "=r"(ipsr)); |
| return ipsr != 0; |
| } |
| #else |
| #error "Please select an architecture specific backend." |
| #endif |
| |
| } // namespace pw::interrupt |
