added copyright tags

[palacios.git] / palacios / src / devices / 8259a.c

diff --git a/palacios/src/devices/8259a.c b/palacios/src/devices/8259a.c
index ee901ef..f695d5d 100644 (file)
--- a/palacios/src/devices/8259a.c
+++ b/palacios/src/devices/8259a.c
@@ -1,3 +1,6 @@
+/* Northwestern University */
+/* (c) 2008, Jack Lange <jarusl@cs.northwestern.edu> */
+
 #include <devices/8259a.h>
 #include <palacios/vmm_intr.h>
 #include <palacios/vmm_types.h>
@@ -8,6 +11,7 @@
 #define PrintDebug(fmt, args...)
 #endif
 
+
 typedef enum {RESET, ICW1, ICW2, ICW3, ICW4,  READY} pic_state_t;
 
 static const uint_t MASTER_PORT1 = 0x20;
@@ -181,6 +185,32 @@ static int pic_raise_intr(void * private_data, int irq) {
   return 0;
 }
 
+
+/*Zheng 07/30/2008*/
+
+static int pic_lower_intr(void *private_data, int irq_no) {
+
+  struct pic_internal *state = (struct pic_internal*)private_data;
+
+  PrintDebug("[pic_lower_intr] IRQ line %d now low\n", (unsigned) irq_no);
+  if (irq_no <= 7) {
+
+    state->master_irr &= ~(1 << irq_no);
+    if ((state->master_irr & ~(state->master_imr)) == 0) {
+      PrintDebug("\t\tFIXME: Master maybe should do sth\n");
+    }
+  } else if ((irq_no > 7) && (irq_no <= 15)) {
+
+    state->slave_irr &= ~(1 << (irq_no - 8));
+    if ((state->slave_irr & (~(state->slave_imr))) == 0) {
+      PrintDebug("\t\tFIXME: Slave maybe should do sth\n");
+    }
+  }
+  return 0;
+}
+
+
+
 static int pic_intr_pending(void * private_data) {
   struct pic_internal * state = (struct pic_internal*)private_data;
 
@@ -193,9 +223,9 @@ static int pic_intr_pending(void * private_data) {
 }
 
 static int pic_get_intr_number(void * private_data) {
-  struct pic_internal * state = (struct pic_internal*)private_data;
-  int i=0;
-  int irq=-1;
+  struct pic_internal * state = (struct pic_internal *)private_data;
+  int i = 0;
+  int irq = -1;
 
   PrintDebug("8259 PIC: getnum: master_irr: 0x%x master_imr: 0x%x\n", i, state->master_irr, state->master_imr);
   PrintDebug("8259 PIC: getnum: slave_irr: 0x%x slave_imr: 0x%x\n", i, state->slave_irr, state->slave_imr);
@@ -221,11 +251,11 @@ static int pic_get_intr_number(void * private_data) {
     }
   }
 
-  if (i==15 || i==6) { 
+  if ((i == 15) || (i == 6)) { 
     DumpPICState(state);
   }
   
-  if (i==16) { 
+  if (i == 16) { 
     return -1;
   } else {
     return irq;
@@ -268,11 +298,15 @@ static int pic_end_irq(void * private_data, int irq) {
 }
 */
 
+
+/*Zheng 07/30/2008*/
 static struct intr_ctrl_ops intr_ops = {
   .intr_pending = pic_intr_pending,
   .get_intr_number = pic_get_intr_number,
   .raise_intr = pic_raise_intr,
   .begin_irq = pic_begin_irq,
+  .lower_intr = pic_lower_intr, //Zheng added
+
 };