static const uint_t SLAVE_PORT1 = 0xA0;
static const uint_t SLAVE_PORT2 = 0xA1;
+#define IS_ICW1(x) (((x & 0x10) >> 4) == 0x1)
#define IS_OCW2(x) (((x & 0x18) >> 3) == 0x0)
#define IS_OCW3(x) (((x & 0x18) >> 3) == 0x1)
+
struct icw1 {
uint_t ic4 : 1; // ICW4 has to be read
uint_t sngl : 1; // single (only one PIC)
struct pic_internal {
- char master_irr;
- char slave_irr;
+ uchar_t master_irr;
+ uchar_t slave_irr;
- char master_isr;
- char slave_isr;
+ uchar_t master_isr;
+ uchar_t slave_isr;
- char master_icw1;
- char master_icw2;
- char master_icw3;
- char master_icw4;
+ uchar_t master_icw1;
+ uchar_t master_icw2;
+ uchar_t master_icw3;
+ uchar_t master_icw4;
- char slave_icw1;
- char slave_icw2;
- char slave_icw3;
- char slave_icw4;
+ uchar_t slave_icw1;
+ uchar_t slave_icw2;
+ uchar_t slave_icw3;
+ uchar_t slave_icw4;
- char master_imr;
- char slave_imr;
- char master_ocw2;
- char master_ocw3;
- char slave_ocw2;
- char slave_ocw3;
+ uchar_t master_imr;
+ uchar_t slave_imr;
+ uchar_t master_ocw2;
+ uchar_t master_ocw3;
+ uchar_t slave_ocw2;
+ uchar_t slave_ocw3;
pic_state_t master_state;
pic_state_t slave_state;
};
+static void DumpPICState(struct pic_internal *p)
+{
+
+ PrintDebug("8259 PIC: master_state=0x%x\n",p->master_state);
+ PrintDebug("8259 PIC: master_irr=0x%x\n",p->master_irr);
+ PrintDebug("8259 PIC: master_isr=0x%x\n",p->master_isr);
+ PrintDebug("8259 PIC: master_imr=0x%x\n",p->master_imr);
+
+ PrintDebug("8259 PIC: master_ocw2=0x%x\n",p->master_ocw2);
+ PrintDebug("8259 PIC: master_ocw3=0x%x\n",p->master_ocw3);
+
+ PrintDebug("8259 PIC: master_icw1=0x%x\n",p->master_icw1);
+ PrintDebug("8259 PIC: master_icw2=0x%x\n",p->master_icw2);
+ PrintDebug("8259 PIC: master_icw3=0x%x\n",p->master_icw3);
+ PrintDebug("8259 PIC: master_icw4=0x%x\n",p->master_icw4);
-static int pic_raise_intr(void * private_data, int irq, int error_code) {
+ PrintDebug("8259 PIC: slave_state=0x%x\n",p->slave_state);
+ PrintDebug("8259 PIC: slave_irr=0x%x\n",p->slave_irr);
+ PrintDebug("8259 PIC: slave_isr=0x%x\n",p->slave_isr);
+ PrintDebug("8259 PIC: slave_imr=0x%x\n",p->slave_imr);
+
+ PrintDebug("8259 PIC: slave_ocw2=0x%x\n",p->slave_ocw2);
+ PrintDebug("8259 PIC: slave_ocw3=0x%x\n",p->slave_ocw3);
+
+ PrintDebug("8259 PIC: slave_icw1=0x%x\n",p->slave_icw1);
+ PrintDebug("8259 PIC: slave_icw2=0x%x\n",p->slave_icw2);
+ PrintDebug("8259 PIC: slave_icw3=0x%x\n",p->slave_icw3);
+ PrintDebug("8259 PIC: slave_icw4=0x%x\n",p->slave_icw4);
+
+}
+
+
+static int pic_raise_intr(void * private_data, int irq) {
struct pic_internal * state = (struct pic_internal*)private_data;
if (irq == 2) {
irq = 9;
+ state->master_irr |= 0x04; // PAD
}
+ PrintDebug("8259 PIC: Raising irq %d in the PIC\n", irq);
+
if (irq <= 7) {
state->master_irr |= 0x01 << irq;
} else if ((irq > 7) && (irq < 16)) {
- state->slave_irr |= 0x01 << (irq - 7);
+ state->slave_irr |= 0x01 << (irq - 8); // PAD if -7 then irq 15=no irq
} else {
+ PrintDebug("8259 PIC: Invalid IRQ raised (%d)\n", irq);
return -1;
}
static int pic_get_intr_number(void * private_data) {
struct pic_internal * state = (struct pic_internal*)private_data;
- int i;
+ 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);
for (i = 0; i < 16; i++) {
if (i <= 7) {
if (((state->master_irr & ~(state->master_imr)) >> i) == 0x01) {
- state->master_isr |= (0x1 << i);
- return i + state->master_icw2;
+ //state->master_isr |= (0x1 << i);
+ // reset the irr
+ //state->master_irr &= ~(0x1 << i);
+ PrintDebug("8259 PIC: IRQ: %d, master_icw2: %x\n", i, state->master_icw2);
+ irq= i + state->master_icw2;
+ break;
}
} else {
- if (((state->slave_irr & ~(state->slave_imr)) >> i) == 0x01) {
- state->slave_isr |= (0x1 << i);
- return i + state->slave_icw2;
+ if (((state->slave_irr & ~(state->slave_imr)) >> (i - 8)) == 0x01) {
+ //state->slave_isr |= (0x1 << (i - 8));
+ //state->slave_irr &= ~(0x1 << (i - 8));
+ PrintDebug("8259 PIC: IRQ: %d, slave_icw2: %x\n", i, state->slave_icw2);
+ irq= (i - 8) + state->slave_icw2;
+ break;
}
}
}
- return 0;
+ if (i==15 || i==6) {
+ DumpPICState(state);
+ }
+
+ if (i==16) {
+ return -1;
+ } else {
+ return irq;
+ }
}
+
+/* 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 {
+ PrintDebug("8259 PIC: Could not find IRQ (0x%x) to Begin\n",irq);
+ 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;
}
*/
-
-
-
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
+ PrintDebug("8259 PIC: Invalid Read length (rd_Master1)\n");
+ return -1;
}
if ((state->master_ocw3 & 0x03) == 0x02) {
- *(char *)dst = state->master_irr;
+ *(uchar_t *)dst = state->master_irr;
} else if ((state->master_ocw3 & 0x03) == 0x03) {
- *(char *)dst = state->master_isr;
+ *(uchar_t *)dst = state->master_isr;
} else {
- *(char *)dst = 0;
+ *(uchar_t *)dst = 0;
}
return 1;
int read_master_port2(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
+ PrintDebug("8259 PIC: Invalid Read length (rd_Master2)\n");
+ return -1;
}
- *(char *)dst = state->master_imr;
+ *(uchar_t *)dst = state->master_imr;
return 1;
int read_slave_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
+ PrintDebug("8259 PIC: Invalid Read length (rd_Slave1)\n");
+ return -1;
}
if ((state->slave_ocw3 & 0x03) == 0x02) {
- *(char*)dst = state->slave_irr;
+ *(uchar_t*)dst = state->slave_irr;
} else if ((state->slave_ocw3 & 0x03) == 0x03) {
- *(char *)dst = state->slave_isr;
+ *(uchar_t *)dst = state->slave_isr;
} else {
- *(char *)dst = 0;
+ *(uchar_t *)dst = 0;
}
return 1;
int read_slave_port2(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
+ PrintDebug("8259 PIC: Invalid Read length (rd_Slave2)\n");
+ return -1;
}
- *(char *)dst = state->slave_imr;
+ *(uchar_t *)dst = state->slave_imr;
return 1;
}
int write_master_port1(ushort_t port, void * src, uint_t length, struct vm_device * dev) {
struct pic_internal * state = (struct pic_internal*)dev->private_data;
- char cw = *(char *)src;
+ uchar_t cw = *(uchar_t *)src;
if (length != 1) {
- // error
+ PrintDebug("8259 PIC: Invalid Write length (wr_Master1)\n");
+ return -1;
}
- if (state->master_state == ICW1) {
+ if (IS_ICW1(cw)) {
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("8259 PIC: Pre ISR = %x (wr_Master1)\n", state->master_isr);
+ for (i = 0; i < 8; i++) {
+ if (state->master_isr & (0x01 << i)) {
+ state->master_isr &= ~(0x01 << i);
+ break;
+ }
+ }
+ PrintDebug("8259 PIC: Post ISR = %x (wr_Master1)\n", state->master_isr);
} else {
- // error;
+ PrintDebug("8259 PIC: Command not handled, or in error (wr_Master1)\n");
+ return -1;
}
state->master_ocw2 = cw;
} else if (IS_OCW3(cw)) {
state->master_ocw3 = cw;
} else {
- // error
+ PrintDebug("8259 PIC: Invalid OCW to PIC (wr_Master1)\n");
+ PrintDebug("8259 PIC: CW=%x\n", cw);
+ return -1;
}
} else {
- // error
+ PrintDebug("8259 PIC: Invalid PIC State (wr_Master1)\n");
+ PrintDebug("8259 PIC: CW=%x\n", cw);
+ return -1;
}
return 1;
int write_master_port2(ushort_t port, void * src, uint_t length, struct vm_device * dev) {
struct pic_internal * state = (struct pic_internal*)dev->private_data;
- char cw = *(char *)src;
+ uchar_t cw = *(uchar_t *)src;
if (length != 1) {
- //error
+ PrintDebug("8259 PIC: Invalid Write length (wr_Master2)\n");
+ return -1;
}
if (state->master_state == ICW2) {
struct icw1 * cw1 = (struct icw1 *)&(state->master_icw1);
+ PrintDebug("8259 PIC: Setting ICW2 = %x (wr_Master2)\n", cw);
state->master_icw2 = cw;
if (cw1->sngl == 0) {
state->master_imr = cw;
} else {
// error
+ PrintDebug("8259 PIC: Invalid master PIC State (wr_Master2)\n");
+ return -1;
}
return 1;
int write_slave_port1(ushort_t port, void * src, uint_t length, struct vm_device * dev) {
struct pic_internal * state = (struct pic_internal*)dev->private_data;
- char cw = *(char *)src;
+ uchar_t cw = *(uchar_t *)src;
if (length != 1) {
// error
+ PrintDebug("8259 PIC: Invalid Write length (wr_Slave1)\n");
+ return -1;
}
- if (state->slave_state == ICW1) {
+ if (IS_ICW1(cw)) {
state->slave_icw1 = cw;
state->slave_state = ICW2;
} else if (state->slave_state == READY) {
// specific EOI;
state->slave_isr &= ~(0x01 << cw2->level);
} else if ((cw2->EOI) & (!cw2->R) && (!cw2->SL)) {
- // non specific EOI
+ int i;
+ // Non-specific EOI
+ PrintDebug("8259 PIC: Pre ISR = %x (wr_Slave1)\n", state->slave_isr);
+ for (i = 0; i < 8; i++) {
+ if (state->slave_isr & (0x01 << i)) {
+ state->slave_isr &= ~(0x01 << i);
+ break;
+ }
+ }
+ PrintDebug("8259 PIC: Post ISR = %x (wr_Slave1)\n", state->slave_isr);
} else {
- // error;
+ PrintDebug("8259 PIC: Command not handled or invalid (wr_Slave1)\n");
+ return -1;
}
state->slave_ocw2 = cw;
// Basically sets the IRR/ISR read flag
state->slave_ocw3 = cw;
} else {
- // error
+ PrintDebug("8259 PIC: Invalid command work (wr_Slave1)\n");
+ return -1;
}
} else {
- // error
+ PrintDebug("8259 PIC: Invalid State writing (wr_Slave1)\n");
+ return -1;
}
return 1;
int write_slave_port2(ushort_t port, void * src, uint_t length, struct vm_device * dev) {
struct pic_internal * state = (struct pic_internal*)dev->private_data;
- char cw = *(char *)src;
+ uchar_t cw = *(uchar_t *)src;
if (length != 1) {
- //error
+ PrintDebug("8259 PIC: Invalid write length (wr_Slave2)\n");
+ return -1;
}
if (state->slave_state == ICW2) {
} else if (state->slave_state == READY) {
state->slave_imr = cw;
} else {
- // error
+ PrintDebug("8259 PIC: Invalid State at write (wr_Slave2)\n");
+ return -1;
}
return 1;
struct vm_device * create_pic() {
struct pic_internal * state = NULL;
- VMMMalloc(struct pic_internal *, state, sizeof(struct pic_internal));
+ state = (struct pic_internal *)V3_Malloc(sizeof(struct pic_internal));
+ V3_ASSERT(state != NULL);
struct vm_device *device = create_device("8259A", &dev_ops, state);
