*** empty log message ***

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

diff --git a/palacios/src/devices/8259a.c b/palacios/src/devices/8259a.c
index 2e305e9..7db595f 100644 (file)
--- a/palacios/src/devices/8259a.c
+++ b/palacios/src/devices/8259a.c
@@ -129,11 +129,14 @@ static int pic_raise_intr(void * private_data, int irq, int error_code) {
     irq = 9;
   }
 
+  PrintDebug("Raising irq %d in the PIC\n", irq);
+
   if (irq <= 7) {
-    state->master_irr |= 0x1 << irq;
+    state->master_irr |= 0x01 << irq;
   } else if ((irq > 7) && (irq < 16)) {
-    state->slave_irr |= 0x1 << (irq - 7);
+    state->slave_irr |= 0x01 << (irq - 7);
   } else {
+    PrintDebug("Invalid IRQ raised (%d)\n", irq);
     return -1;
   }
 
@@ -157,12 +160,18 @@ static int pic_get_intr_number(void * private_data) {
 
   for (i = 0; i < 16; i++) {
     if (i <= 7) {
-      if (((state->master_irr & ~(state->master_imr)) >> i) == 0x1) {
-       return i;
+      if (((state->master_irr & ~(state->master_imr)) >> i) == 0x01) {
+       //state->master_isr |= (0x1 << i);
+       // reset the irr
+       //state->master_irr &= ~(0x1 << i);
+       PrintDebug("IRQ: %d, icw2: %x\n", i, state->master_icw2);
+       return i + state->master_icw2;
       }
     } else {
-      if (((state->slave_irr & ~(state->slave_imr)) >> i) == 0x1) {
-       return i;
+      if (((state->slave_irr & ~(state->slave_imr)) >> (i - 8)) == 0x01) {
+       //state->slave_isr |= (0x1 << (i - 8));
+       //state->slave_irr &= ~(0x1 << (i - 8));
+       return (i - 8) + state->slave_icw2;
       }
     }
   }
@@ -171,27 +180,58 @@ static int pic_get_intr_number(void * private_data) {
 }
 
 
+/* The IRQ number is the number returned by pic_get_intr_number(), not the pin number */
+static int pic_begin_irq(void * private_data, int irq) {
+  struct pic_internal * state = (struct pic_internal*)private_data;
+
+  if ((irq >= state->master_icw2) && (irq <= state->master_icw2 + 7)) {
+    irq &= 0x7;
+  } else if ((irq >= state->slave_icw2) && (irq <= state->slave_icw2 + 7)) {
+    irq &= 0x7;
+    irq += 8;
+  } else {
+    return -1;
+  }
+
+  if (irq <= 7) {
+    if (((state->master_irr & ~(state->master_imr)) >> irq) == 0x01) {
+      state->master_isr |= (0x1 << irq);
+      state->master_irr &= ~(0x1 << irq);
+    }
+  } else {
+    state->slave_isr |= (0x1 << (irq - 8));
+    state->slave_irr &= ~(0x1 << (irq - 8));
+  }
+
+  return 0;
+}
+
+/*
+static int pic_end_irq(void * private_data, int irq) {
+
+  return 0;
+}
+*/
+
 static struct intr_ctrl_ops intr_ops = {
   .intr_pending = pic_intr_pending,
   .get_intr_number = pic_get_intr_number,
-  .raise_intr = pic_raise_intr
+  .raise_intr = pic_raise_intr,
+  .begin_irq = pic_begin_irq,
 };
 
 
 
 
-
-
-
 int read_master_port1(ushort_t port, void * dst, uint_t length, struct vm_device * dev) {
   struct pic_internal * state = (struct pic_internal*)dev->private_data;
   if (length != 1) {
     //error
   }
   
-  if ((state->master_ocw3 & 0x3) == 0x2) {
+  if ((state->master_ocw3 & 0x03) == 0x02) {
     *(char *)dst = state->master_irr;
-  } else if ((state->master_ocw3 & 0x3) == 0x3) {
+  } else if ((state->master_ocw3 & 0x03) == 0x03) {
     *(char *)dst = state->master_isr;
   } else {
     *(char *)dst = 0;
@@ -218,9 +258,9 @@ int read_slave_port1(ushort_t port, void * dst, uint_t length, struct vm_device
     // error
   }
   
-  if ((state->slave_ocw3 & 0x3) == 0x2) {
+  if ((state->slave_ocw3 & 0x03) == 0x02) {
     *(char*)dst = state->slave_irr;
-  } else if ((state->slave_ocw3 & 0x3) == 0x3) {
+  } else if ((state->slave_ocw3 & 0x03) == 0x03) {
     *(char *)dst = state->slave_isr;
   } else {
     *(char *)dst = 0;
@@ -252,8 +292,31 @@ int write_master_port1(ushort_t port, void * src, uint_t length, struct vm_devic
   if (state->master_state == ICW1) {
     state->master_icw1 = cw;
     state->master_state = ICW2;
+
   } else if (state->master_state == READY) {
     if (IS_OCW2(cw)) {
+      // handle the EOI here
+      struct ocw2 * cw2 =  (struct ocw2*)&cw;
+
+      
+      if ((cw2->EOI) && (!cw2->R) && (cw2->SL)) {
+       // specific EOI;
+       state->master_isr &= ~(0x01 << cw2->level);
+      } else if ((cw2->EOI) & (!cw2->R) && (!cw2->SL)) {
+       int i;
+       // Non-specific EOI
+       PrintDebug("Pre ISR = %x\n", state->master_isr);
+       for (i = 0; i < 8; i++) {
+         if (state->master_isr & (0x01 << i)) {
+           state->master_isr &= ~(0x01 << i);
+           break;
+         }
+       }       
+               PrintDebug("Post ISR = %x\n", state->master_isr);
+      } else {
+       // error;
+      }
+
       state->master_ocw2 = cw;
     } else if (IS_OCW3(cw)) {
       state->master_ocw3 = cw;
@@ -278,6 +341,7 @@ int write_master_port2(ushort_t port, void * src, uint_t length, struct vm_devic
     if (state->master_state == ICW2) {
       struct icw1 * cw1 = (struct icw1 *)&(state->master_icw1);
 
+      PrintDebug("Setting ICW2 = %x\n", cw);
       state->master_icw2 = cw;
 
       if (cw1->sngl == 0) {
@@ -324,8 +388,30 @@ int write_slave_port1(ushort_t port, void * src, uint_t length, struct vm_device
     state->slave_state = ICW2;
   } else if (state->slave_state == READY) {
     if (IS_OCW2(cw)) {
+      // handle the EOI here
+      struct ocw2 * cw2 =  (struct ocw2 *)&cw;
+      
+      if ((cw2->EOI) && (!cw2->R) && (cw2->SL)) {
+       // specific EOI;
+       state->slave_isr &= ~(0x01 << cw2->level);
+      } else if ((cw2->EOI) & (!cw2->R) && (!cw2->SL)) {
+       int i;
+       // Non-specific EOI
+       PrintDebug("Pre ISR = %x\n", state->slave_isr);
+       for (i = 0; i < 8; i++) {
+         if (state->slave_isr & (0x01 << i)) {
+           state->slave_isr &= ~(0x01 << i);
+           break;
+         }
+       }       
+               PrintDebug("Post ISR = %x\n", state->slave_isr);
+      } else {
+       // error;
+      }
+
       state->slave_ocw2 = cw;
     } else if (IS_OCW3(cw)) {
+      // Basically sets the IRR/ISR read flag
       state->slave_ocw3 = cw;
     } else {
       // error
@@ -401,7 +487,7 @@ int pic_init(struct vm_device * dev) {
   state->master_icw4 = 0;
   state->master_imr = 0;
   state->master_ocw2 = 0;
-  state->master_ocw3 = 0x2;
+  state->master_ocw3 = 0x02;
   state->master_state = ICW1;
 
 
@@ -413,7 +499,7 @@ int pic_init(struct vm_device * dev) {
   state->slave_icw4 = 0;
   state->slave_imr = 0;
   state->slave_ocw2 = 0;
-  state->slave_ocw3 = 0x2;
+  state->slave_ocw3 = 0x02;
   state->slave_state = ICW1;
 
 
@@ -452,7 +538,7 @@ static struct vm_device_ops dev_ops = {
 
 struct vm_device * create_pic() {
   struct pic_internal * state = NULL;
-  VMMMalloc(struct pic_internal *, state, sizeof(struct pic_internal));
+  V3_Malloc(struct pic_internal *, state, sizeof(struct pic_internal));
 
   struct vm_device *device = create_device("8259A", &dev_ops, state);