| // 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. |
| |
| #include <inttypes.h> |
| |
| #include "pw_boot_armv7m/boot.h" |
| |
| void pw_PreStaticConstructorInit() { |
| // TODO(pwbug/17): Optionally enable Replace when Pigweed config system is |
| // added. |
| #if PW_ARMV7M_ENABLE_FPU |
| // Enable FPU if built using hardware FPU instructions. |
| // CPCAR mask that enables FPU. (ARMv7-M Section B3.2.20) |
| const uint32_t kFpuEnableMask = (0xFu << 20); |
| |
| // Memory mapped register to enable FPU. (ARMv7-M Section B3.2.2, Table B3-4) |
| volatile uint32_t* arm_v7m_cpacr = (volatile uint32_t*)0xE000ED88u; |
| |
| *arm_v7m_cpacr |= kFpuEnableMask; |
| #endif // PW_ARMV7M_ENABLE_FPU |
| } |
