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68 lines
2.3 KiB
68 lines
2.3 KiB
// 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 "pw_boot_armv7m/boot.h"
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#include "pw_malloc/malloc.h"
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#include "pw_preprocessor/compiler.h"
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#include "pw_sys_io_baremetal_stm32f429/init.h"
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// Note that constexpr is used inside of this function instead of using a static
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// constexpr or declaring it outside of this function in an anonymous namespace,
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// because constexpr makes it available for the compiler to evaluate during
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// copmile time but does NOT require it to be evaluated at compile team and we
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// have to be incredibly careful that this does not end up in the .data section.
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void pw_boot_PreStaticMemoryInit() {
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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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constexpr 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 =
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*reinterpret_cast<volatile uint32_t*>(0xE000ED88u);
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arm_v7m_cpacr |= kFpuEnableMask;
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// Ensure the FPU configuration is committed and enabled before continuing and
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// potentially executing any FPU instructions, however rare that may be during
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// startup.
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asm volatile(
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" dsb \n"
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" isb \n"
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// clang-format off
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: /*output=*/
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: /*input=*/
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: /*clobbers=*/"memory"
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// clang-format on
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);
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#endif // PW_ARMV7M_ENABLE_FPU
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}
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void pw_boot_PreStaticConstructorInit() {
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#if PW_MALLOC_ACTIVE
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pw_MallocInit();
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#endif // PW_MALLOC_ACTIVE
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}
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void pw_boot_PreMainInit() { pw_sys_io_Init(); }
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PW_NO_RETURN void pw_boot_PostMain() {
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// In case main() returns, just sit here until the device is reset.
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while (true) {
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}
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PW_UNREACHABLE;
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}
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