1#![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, 256>;
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::support;
27
28pub use cortexm::initialize_ram_jump_to_main;
29pub use cortexm::interrupt_mask;
30pub use cortexm::nvic;
31pub use cortexm::scb;
32pub use cortexm::systick;
33pub use cortexm::unhandled_interrupt;
34pub use cortexm::CortexMVariant;
35use cortexm0::CortexM0;
36
37#[cfg(not(any(doc, all(target_arch = "arm", target_os = "none"))))]
39pub unsafe extern "C" fn svc_handler() {
40 unimplemented!()
41}
42
43#[cfg(any(doc, all(target_arch = "arm", target_os = "none")))]
44#[unsafe(naked)]
45pub unsafe extern "C" fn svc_handler() {
46 use core::arch::naked_asm;
47 naked_asm!(
48 "
49 ldr r0, 100f // EXC_RETURN_MSP
50 cmp lr, r0
51 bne 300f // to_kernel
52
53 // If we get here, then this is a context switch from the kernel to the
54 // application. Set thread mode to unprivileged to run the application.
55 movs r0, #1
56 msr CONTROL, r0
57 ldr r1, 200f // EXC_RETURN_PSP
58 bx r1
59
60300: // to_kernel
61 ldr r0, =SYSCALL_FIRED
62 movs r1, #1
63 str r1, [r0, #0]
64 // Set thread mode to privileged as we switch back to the kernel.
65 movs r0, #0
66 msr CONTROL, r0
67 ldr r1, 100f // EXC_RETURN_MSP
68 bx r1
69
70.align 4
71100: // EXC_RETURN_MSP
72 .word 0xFFFFFFF9
73200: // EXC_RETURN_PSP
74 .word 0xFFFFFFFD
75 ",
76 );
77}
78
79pub enum CortexM0P {}
83
84impl cortexm::CortexMVariant for CortexM0P {
85 const GENERIC_ISR: unsafe extern "C" fn() = CortexM0::GENERIC_ISR;
86 const SYSTICK_HANDLER: unsafe extern "C" fn() = CortexM0::SYSTICK_HANDLER;
87 const SVC_HANDLER: unsafe extern "C" fn() = svc_handler;
88 const HARD_FAULT_HANDLER: unsafe extern "C" fn() = CortexM0::HARD_FAULT_HANDLER;
89
90 #[cfg(any(doc, all(target_arch = "arm", target_os = "none")))]
91 unsafe fn switch_to_user(
92 user_stack: *const usize,
93 process_regs: &mut [usize; 8],
94 ) -> *const usize {
95 CortexM0::switch_to_user(user_stack, process_regs)
96 }
97
98 #[cfg(not(any(doc, all(target_arch = "arm", target_os = "none"))))]
99 unsafe fn switch_to_user(
100 _user_stack: *const usize,
101 _process_regs: &mut [usize; 8],
102 ) -> *const usize {
103 unimplemented!()
104 }
105
106 #[inline]
107 unsafe fn print_cortexm_state(writer: &mut dyn Write) {
108 cortexm::print_cortexm_state(writer)
109 }
110}
111
112pub mod syscall {
113 pub type SysCall = cortexm::syscall::SysCall<crate::CortexM0P>;
114}