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ec9dd67691
Adds pw_PreStaticConstructorInit() to allow ARMv7-M targets that use pw_boot to perform initialization before C++ static constructors are run. Updates stm32f429i-disc1 to enable FPU before static constructors so static constructors can safely perform FPU operations if necessary. Change-Id: I66cfa82096719f59c42c84e4bafd0e1740002e09
32 lines
1.2 KiB
C
32 lines
1.2 KiB
C
// Copyright 2020 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include <inttypes.h>
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#include "pw_boot_armv7m/boot.h"
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void pw_PreStaticConstructorInit() {
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// TODO(pwbug/17): Optionally enable Replace when Pigweed config system is
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// added.
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#if PW_ARMV7M_ENABLE_FPU
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// Enable FPU if built using hardware FPU instructions.
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// CPCAR mask that enables FPU. (ARMv7-M Section B3.2.20)
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const uint32_t kFpuEnableMask = (0xFu << 20);
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// Memory mapped register to enable FPU. (ARMv7-M Section B3.2.2, Table B3-4)
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volatile uint32_t* arm_v7m_cpacr = (volatile uint32_t*)0xE000ED88u;
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*arm_v7m_cpacr |= kFpuEnableMask;
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#endif // PW_ARMV7M_ENABLE_FPU
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} |