1 // Copyright 2020 The Pigweed Authors
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
7 // https://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
15 #include "pw_boot_armv7m/boot.h"
17 #include "pw_preprocessor/compiler.h"
18 #include "pw_sys_io_baremetal_lm3s6965evb/init.h"
20 // Note that constexpr is used inside of this function instead of using a static
21 // constexpr or declaring it outside of this function in an anonymous namespace,
22 // because constexpr makes it available for the compiler to evaluate during
23 // copmile time but does NOT require it to be evaluated at compile team and we
24 // have to be incredibly careful that this does not end up in the .data section.
25 void pw_boot_PreStaticMemoryInit() {
26 // Force RCC to be at default at boot.
27 constexpr uint32_t kRccDefault = 0x078E3AD1U;
28 volatile uint32_t& rcc = *reinterpret_cast<volatile uint32_t*>(0x400FE070U);
30 constexpr uint32_t kRcc2Default = 0x07802810U;
31 volatile uint32_t& rcc2 = *reinterpret_cast<volatile uint32_t*>(0x400FE070U);
35 void pw_boot_PreStaticConstructorInit() {}
37 void pw_boot_PreMainInit() { pw_sys_io_Init(); }
39 PW_NO_RETURN void pw_boot_PostMain() {
40 // QEMU requires a special command to tell the VM to shut down.
41 volatile uint32_t* aircr = (uint32_t*)(0xE000ED0CU);
44 // In case main() returns, just sit here until the device is reset.