Armando Montanez | ec9dd67 | 2020-06-05 12:32:51 -0700 | [diff] [blame] | 1 | // Copyright 2020 The Pigweed Authors |
| 2 | // |
| 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 |
| 5 | // the License at |
| 6 | // |
| 7 | // https://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 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 |
| 13 | // the License. |
| 14 | |
| 15 | #include "pw_boot_armv7m/boot.h" |
Ewout van Bekkum | 0f82b33 | 2020-08-24 13:29:16 -0700 | [diff] [blame] | 16 | |
Ewout van Bekkum | 738f42c | 2020-08-24 12:55:13 -0700 | [diff] [blame] | 17 | #include "pw_preprocessor/compiler.h" |
Ewout van Bekkum | 712cbfb | 2020-08-24 11:55:57 -0700 | [diff] [blame] | 18 | #include "pw_sys_io_baremetal_lm3s6965evb/init.h" |
Armando Montanez | ec9dd67 | 2020-06-05 12:32:51 -0700 | [diff] [blame] | 19 | |
Ewout van Bekkum | 0f82b33 | 2020-08-24 13:29:16 -0700 | [diff] [blame] | 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 |
Yicheng Li | d61fc3a | 2021-04-05 16:21:34 -0700 | [diff] [blame^] | 23 | // compile time but does NOT require it to be evaluated at compile time and we |
Ewout van Bekkum | 0f82b33 | 2020-08-24 13:29:16 -0700 | [diff] [blame] | 24 | // have to be incredibly careful that this does not end up in the .data section. |
Ewout van Bekkum | 712cbfb | 2020-08-24 11:55:57 -0700 | [diff] [blame] | 25 | void pw_boot_PreStaticMemoryInit() { |
| 26 | // Force RCC to be at default at boot. |
Ewout van Bekkum | 0f82b33 | 2020-08-24 13:29:16 -0700 | [diff] [blame] | 27 | constexpr uint32_t kRccDefault = 0x078E3AD1U; |
| 28 | volatile uint32_t& rcc = *reinterpret_cast<volatile uint32_t*>(0x400FE070U); |
| 29 | rcc = kRccDefault; |
| 30 | constexpr uint32_t kRcc2Default = 0x07802810U; |
| 31 | volatile uint32_t& rcc2 = *reinterpret_cast<volatile uint32_t*>(0x400FE070U); |
| 32 | rcc2 = kRcc2Default; |
Ewout van Bekkum | 712cbfb | 2020-08-24 11:55:57 -0700 | [diff] [blame] | 33 | } |
| 34 | |
Ewout van Bekkum | fff82ec | 2020-08-21 15:54:28 -0700 | [diff] [blame] | 35 | void pw_boot_PreStaticConstructorInit() {} |
Ewout van Bekkum | 712cbfb | 2020-08-24 11:55:57 -0700 | [diff] [blame] | 36 | |
| 37 | void pw_boot_PreMainInit() { pw_sys_io_Init(); } |
Ewout van Bekkum | 738f42c | 2020-08-24 12:55:13 -0700 | [diff] [blame] | 38 | |
| 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); |
| 42 | *aircr = 0x5fa0004; |
| 43 | |
| 44 | // In case main() returns, just sit here until the device is reset. |
Ewout van Bekkum | 0f82b33 | 2020-08-24 13:29:16 -0700 | [diff] [blame] | 45 | while (true) { |
Ewout van Bekkum | 738f42c | 2020-08-24 12:55:13 -0700 | [diff] [blame] | 46 | } |
| 47 | PW_UNREACHABLE; |
| 48 | } |