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zynq-rs/libcortex_a9/src/asm.rs

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/// The classic no-op
#[inline]
pub fn nop() {
unsafe { llvm_asm!("nop" :::: "volatile") }
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}
/// Wait For Event
#[inline]
pub fn wfe() {
unsafe { llvm_asm!("wfe" :::: "volatile") }
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}
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/// Send Event
#[inline]
pub fn sev() {
unsafe { llvm_asm!("sev" :::: "volatile") }
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}
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/// Data Memory Barrier
#[inline]
pub fn dmb() {
unsafe { llvm_asm!("dmb" :::: "volatile") }
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}
/// Data Synchronization Barrier
#[inline]
pub fn dsb() {
unsafe { llvm_asm!("dsb" :::: "volatile") }
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}
/// Instruction Synchronization Barrier
#[inline]
pub fn isb() {
unsafe { llvm_asm!("isb" :::: "volatile") }
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}
/// Enable IRQ
#[inline]
pub unsafe fn enable_irq() {
llvm_asm!("cpsie i":::: "volatile");
}
/// Disable IRQ, return if IRQ was originally enabled.
#[inline]
pub unsafe fn enter_critical() -> bool {
let mut cpsr: u32;
llvm_asm!(
"mrs $0, cpsr
cpsid i"
: "=r"(cpsr) ::: "volatile");
(cpsr & (1 << 7)) == 0
}
#[inline]
pub unsafe fn exit_critical(enable: bool) {
// https://stackoverflow.com/questions/40019929/temporarily-disable-interrupts-on-arm
let mask: u32 = if enable {
1 << 7
} else {
0
};
llvm_asm!(
"mrs r1, cpsr
bic r1, r1, $0
msr cpsr_c, r1"
:: "r"(mask) : "r1");
}
/// Exiting IRQ
#[inline]
pub unsafe fn exit_irq() {
llvm_asm!("
mrs r0, SPSR
msr CPSR, r0
" ::: "r0");
}