From cd3199199b9d1cce938f245c5bf629f7f886f908 Mon Sep 17 00:00:00 2001
From: Achilleas Anagnostopoulos <achilleas.imap.mbox@gmail.com>
Date: Wed, 21 Jun 2017 07:58:15 +0100
Subject: [PATCH] Add assemnly code for enabling/disabling insterrupts and
 halting the CPU

---
 kernel/cpu/cpu_amd64.go |  9 +++++++++
 kernel/cpu/cpu_amd64.s  | 13 +++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/kernel/cpu/cpu_amd64.go b/kernel/cpu/cpu_amd64.go
index 4943fa2..7776082 100644
--- a/kernel/cpu/cpu_amd64.go
+++ b/kernel/cpu/cpu_amd64.go
@@ -1,5 +1,14 @@
 package cpu
 
+// EnableInterrupts enables interrupt handling.
+func EnableInterrupts()
+
+// DisableInterrupts disables interrupt handling.
+func DisableInterrupts()
+
+// Halt stops instruction execution.
+func Halt()
+
 // FlushTLBEntry flushes a TLB entry for a particular virtual address.
 func FlushTLBEntry(virtAddr uintptr)
 
diff --git a/kernel/cpu/cpu_amd64.s b/kernel/cpu/cpu_amd64.s
index 002c8cb..5ef45db 100644
--- a/kernel/cpu/cpu_amd64.s
+++ b/kernel/cpu/cpu_amd64.s
@@ -1,5 +1,18 @@
 #include "textflag.h"
 
+TEXT ·EnableInterrupts(SB),NOSPLIT,$0
+	STI
+	RET
+
+TEXT ·DisableInterrupts(SB),NOSPLIT,$0
+	CLI
+	RET
+
+TEXT ·Halt(SB),NOSPLIT,$0
+	CLI
+	HLT
+	RET
+
 TEXT ·FlushTLBEntry(SB),NOSPLIT,$0
 	INVLPG virtAddr+0(FP)
 	RET