From 6d09e71d9a9366b0a3a0cb76a46fd5f8de51f2b3 Mon Sep 17 00:00:00 2001
From: Ali Mashtizadeh <mashti@cs.stanford.edu>
Date: Thu, 10 Jul 2014 12:18:54 -0700
Subject: [PATCH] Mask some LAPIC interrupts

---
 sys/amd64/lapic.c | 20 +++++++++++++++++---
 sys/amd64/trap.h  |  2 ++
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/sys/amd64/lapic.c b/sys/amd64/lapic.c
index fdeec24..4e83d69 100644
--- a/sys/amd64/lapic.c
+++ b/sys/amd64/lapic.c
@@ -22,6 +22,8 @@
 #define LAPIC_SIV           0x00F0 /* Spurious Interrupt Vector */
 #define LAPIC_SIV_ENABLE            0x100
 
+#define LAPIC_ESR           0x0280 /* Error Status Register */
+#define LAPIC_LVT_CMCI      0x02F0 /* LVT CMCI */
 #define LAPIC_LVT_TIMER     0x0320 /* LVT Timer */
 #define LAPIC_LVT_TIMER_ONESHOT     0x00000000
 #define LAPIC_LVT_TIMER_PERIODIC    0x00020000
@@ -30,7 +32,9 @@
 #define LAPIC_LVT_PMCR      0x0340 /* LVT Performance Monitoring Counter */
 #define LAPIC_LVT_LINT0     0x0350 /* LVT LINT0 */
 #define LAPIC_LVT_LINT1     0x0360 /* LVT LINT1 */
-#define LAPIC_LVT_ERROR     0x0370 /* Error Register */
+#define LAPIC_LVT_ERROR     0x0370 /* LVT Error */
+#define LAPIC_LVT_FLAG_MASKED	    0x00010000 /* Masked */
+
 #define LAPIC_TICR          0x0380 /* Timer Initial Count Register */
 #define LAPIC_TCCR          0x0390 /* Timer Currnet Count Register */
 #define LAPIC_TDCR          0x03E0 /* Time Divide Configuration Register */
@@ -100,13 +104,23 @@ LAPIC_Init()
     // Enable interrupts
     LAPIC_Write(LAPIC_SIV, LAPIC_SIV_ENABLE | T_IRQ_SPURIOUS);
 
+    // Clear any remaining errors
+    LAPIC_Write(LAPIC_ESR, 0);
+
+    // Enable error and thermal interrupts
+    LAPIC_Write(LAPIC_LVT_ERROR, T_IRQ_ERROR);
+    LAPIC_Write(LAPIC_LVT_THERMAL, T_IRQ_THERMAL);
+
+    // Disable LINT0/1, PMC
+    LAPIC_Write(LAPIC_LVT_LINT0, LAPIC_LVT_FLAG_MASKED);
+    LAPIC_Write(LAPIC_LVT_LINT1, LAPIC_LVT_FLAG_MASKED);
+    LAPIC_Write(LAPIC_LVT_PMCR, LAPIC_LVT_FLAG_MASKED);
+
     LAPIC_Periodic(10000000);
 
     LAPIC_SendEOI();
 
     LAPIC_Write(LAPIC_TPR, 0);
-
-    //enable_interrupts();
 }
 
 
diff --git a/sys/amd64/trap.h b/sys/amd64/trap.h
index b8605bd..0ccfe28 100644
--- a/sys/amd64/trap.h
+++ b/sys/amd64/trap.h
@@ -32,6 +32,8 @@
 #define T_IRQ_KBD       (T_IRQ_BASE + 1)
 #define T_IRQ_COM1      (T_IRQ_BASE + 4)
 #define T_IRQ_SPURIOUS  (T_IRQ_BASE + 24)
+#define T_IRQ_ERROR     (T_IRQ_BASE + 25)
+#define T_IRQ_THERMAL   (T_IRQ_BASE + 26)
 
 #define T_MAX   64