1//! Main Stack Pointer
2
3/// Reads the CPU register
4#[inline]
5pub fn read() -> u32 {
6 call_asm!(__msp_r() -> u32)
7}
8
9/// Writes `bits` to the CPU register
10#[inline]
11#[deprecated = "calling this function invokes Undefined Behavior, consider asm::bootstrap as an alternative"]
12pub unsafe fn write(bits: u32) {
13 call_asm!(__msp_w(bits: u32));
14}
15
16/// Reads the Non-Secure CPU register from Secure state.
17///
18/// Executing this function in Non-Secure state will return zeroes.
19#[cfg(armv8m)]
20#[inline]
21pub fn read_ns() -> u32 {
22 call_asm!(__msp_ns_r() -> u32)
23}
24
25/// Writes `bits` to the Non-Secure CPU register from Secure state.
26///
27/// Executing this function in Non-Secure state will be ignored.
28#[cfg(armv8m)]
29#[inline]
30pub unsafe fn write_ns(bits: u32) {
31 call_asm!(__msp_ns_w(bits: u32));
32}
33