cortexm4/
lib.rs

1// Licensed under the Apache License, Version 2.0 or the MIT License.
2// SPDX-License-Identifier: Apache-2.0 OR MIT
3// Copyright Tock Contributors 2022.
4
5//! Shared implementations for ARM Cortex-M4 MCUs.
6
7#![no_std]
8
9use core::fmt::Write;
10
11pub mod mpu {
12    use kernel::utilities::StaticRef;
13
14    pub type MPU = cortexm::mpu::MPU<8, 32>;
15
16    const MPU_BASE_ADDRESS: StaticRef<cortexm::mpu::MpuRegisters> =
17        unsafe { StaticRef::new(0xE000ED90 as *const cortexm::mpu::MpuRegisters) };
18
19    pub unsafe fn new() -> MPU {
20        MPU::new(MPU_BASE_ADDRESS)
21    }
22}
23
24pub use cortexm::dwt;
25pub use cortexm::initialize_ram_jump_to_main;
26pub use cortexm::nvic;
27pub use cortexm::scb;
28pub use cortexm::support;
29pub use cortexm::systick;
30pub use cortexm::thread_id;
31pub use cortexm::unhandled_interrupt;
32pub use cortexm::CortexMVariant;
33
34// Enum with no variants to ensure that this type is not instantiable. It is
35// only used to pass architecture-specific constants and functions via the
36// `CortexMVariant` trait.
37pub enum CortexM4 {}
38
39impl cortexm::CortexMVariant for CortexM4 {
40    const GENERIC_ISR: unsafe extern "C" fn() = cortexv7m::generic_isr_arm_v7m;
41    const SYSTICK_HANDLER: unsafe extern "C" fn() = cortexv7m::systick_handler_arm_v7m;
42    const SVC_HANDLER: unsafe extern "C" fn() = cortexv7m::svc_handler_arm_v7m;
43    const HARD_FAULT_HANDLER: unsafe extern "C" fn() = cortexv7m::hard_fault_handler_arm_v7m;
44
45    #[cfg(all(target_arch = "arm", target_os = "none"))]
46    unsafe fn switch_to_user(
47        user_stack: *const usize,
48        process_regs: &mut [usize; 8],
49    ) -> *const usize {
50        cortexv7m::switch_to_user_arm_v7m(user_stack, process_regs)
51    }
52
53    #[cfg(not(all(target_arch = "arm", target_os = "none")))]
54    unsafe fn switch_to_user(
55        _user_stack: *const usize,
56        _process_regs: &mut [usize; 8],
57    ) -> *const usize {
58        unimplemented!()
59    }
60
61    #[inline]
62    unsafe fn print_cortexm_state(writer: &mut dyn Write) {
63        cortexm::print_cortexm_state(writer)
64    }
65}
66
67pub mod syscall {
68    pub type SysCall = cortexm::syscall::SysCall<crate::CortexM4>;
69}
cortexm4/lib.rs

cortexm4/
lib.rs
