From 6f1e6acb1a9775eef4b0d8879c102df86e207687 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 18 Aug 2022 18:21:13 -0700
Subject: Assembly stuff

---
 src/_arch/arm/asm.rs | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

(limited to 'src/_arch/arm/asm.rs')

diff --git a/src/_arch/arm/asm.rs b/src/_arch/arm/asm.rs
index c400f2f..c1af5b4 100644
--- a/src/_arch/arm/asm.rs
+++ b/src/_arch/arm/asm.rs
@@ -1,9 +1,42 @@
 //! Wrapping ARMv7-A Instructions
 
 /// WFE
-/// #[inline(always)]
+#[inline(always)]
 pub fn wfe() {
     unsafe {
         core::arch::asm!("wfe", options(nomem, nostack))
     }
 }
+
+/// NOP
+#[inline(always)]
+pub fn nop() {
+    unsafe {
+        core::arch::asm!("nop", options(nomem, nostack))
+    }
+}
+
+/// Store u32 to address
+#[inline]
+pub fn store32(addr: u32, value: u32) {
+	unsafe {
+		*(addr as *mut u32) = value;
+	}
+}
+
+/// Read u32 value from address
+#[inline]
+pub fn load32(addr: u32) -> u32 {
+	unsafe {
+		*(addr as *mut u32)
+	}
+}
+
+/// Wait for n cycles
+#[inline]
+pub fn spin_for_n_cycles(n: u32) {
+	unsafe {
+		core::arch::asm!("1: subs r1, #1
+				bne 1b", in("r1") n);
+	}
+}
-- 
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