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53 lines
1.1 KiB
Rust
53 lines
1.1 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2021 Andre Richter <andre.o.richter@gmail.com>
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//! Architectural processor code.
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//!
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//! # Orientation
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//!
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//! Since arch modules are imported into generic modules using the path attribute, the path of this
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//! file is:
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//!
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//! crate::cpu::arch_cpu
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use cortex_a::asm;
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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pub use asm::nop;
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/// Spin for `n` cycles.
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#[inline(always)]
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pub fn spin_for_cycles(n: usize) {
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for _ in 0..n {
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asm::nop();
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}
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}
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/// Pause execution on the core.
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#[inline(always)]
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pub fn wait_forever() -> ! {
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loop {
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asm::wfe()
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}
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}
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/// Branch to a raw integer value.
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///
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/// # Safety
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///
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/// - This is highly unsafe. Use with care.
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#[inline(always)]
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pub unsafe fn branch_to_raw_addr(addr: usize) -> ! {
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asm!(
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"blr {destination:x}",
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destination = in(reg) addr,
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options(nomem, nostack)
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);
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core::intrinsics::unreachable()
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}
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