add delay between IOs

3 files changed, 29 insertions, 0 deletions

diff --git a/src/arch/x86_64/asm/misc.s b/src/arch/x86_64/asm/misc.s
new file mode 100644
index 0000000..fc5aa90
--- /dev/null
+++ b/src/arch/x86_64/asm/misc.s
@@ -0,0 +1,11 @@
+; place for misc code, before they find better places to live..
+
+[GLOBAL _delay]
+
+[SECTION .text]
+
+_delay:
+    jmp .dummy
+.dummy:
+    ret
+
diff --git a/src/arch/x86_64/misc.rs b/src/arch/x86_64/misc.rs
new file mode 100644
index 0000000..c007d99
--- /dev/null
+++ b/src/arch/x86_64/misc.rs
@@ -0,0 +1,17 @@
+// wrappers for misc. architectural code
+// before they find better place to go.
+// asm code goes to asm/misc.s
+
+extern "C" {
+    fn _delay();
+}
+
+#[inline(always)]
+
+// delays for several cycles. Used to fill sequantial IO commands
+// (for devices to react)
+pub fn delay() {
+    unsafe {
+        _delay();
+    }                
+}
diff --git a/src/arch/x86_64/mod.rs b/src/arch/x86_64/mod.rs
index ef06437..f48c7fd 100644
--- a/src/arch/x86_64/mod.rs
+++ b/src/arch/x86_64/mod.rs
@@ -3,3 +3,4 @@ pub mod pic;
 pub mod pit;
 pub mod plugbox;
 pub mod cpu;
+pub mod misc;