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

diff --git a/palacios/src/devices/8259a.c b/palacios/src/devices/8259a.c
index ee901ef..470d878 100644 (file)
--- a/palacios/src/devices/8259a.c
+++ b/palacios/src/devices/8259a.c
@@ -8,6 +8,13 @@
 #define PrintDebug(fmt, args...)
 #endif
 
+#ifdef DEBUG_RAMDISK
+#define Ramdisk_Print_Pic(_f, _a...) PrintTrace("\n8259a.c(%d) "_f, __LINE__, ## _a)
+#else
+#define Ramdisk_Print_Pic(_f, _a...)
+#endif
+
+
 typedef enum {RESET, ICW1, ICW2, ICW3, ICW4,  READY} pic_state_t;
 
 static const uint_t MASTER_PORT1 = 0x20;
@@ -181,6 +188,32 @@ 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;
+
+  Ramdisk_Print_Pic("[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) {
+      Ramdisk_Print_Pic("\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) {
+      Ramdisk_Print_Pic("\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;
 
@@ -268,11 +301,15 @@ 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
+
 };