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/*
* PCI IRQ Routing Table dumper
* Copyright (c) 2006 Dell, Inc.
* by Matt Domsch <Matt_Domsch@dell.com>
*
* Based on the description of said table found at
* http://www.microsoft.com/hwdev/busbios/pciirq.htm
* Licensed under the GNU General Public license, version 2.
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <limits.h>
#include <sys/mman.h>
#include "pirq.h"
extern int nopirq;
/* If unknown, use INT_MAX so they get sorted last */
int pirq_pci_dev_to_slot(struct routing_table *table, int domain, int bus, int dev)
{
int i, num_slots;
struct slot_entry *slot;
if (!table)
return INT_MAX;
if (domain != 0) /* can't represent non-zero domains in PIRQ */
return INT_MAX;
num_slots = (table->size - 32) / sizeof(*slot);
for (i=0; i<num_slots; i++) {
slot = &table->slot[i];
if (slot->bus == bus &&
PCI_DEVICE(slot->device) == dev) {
if (slot->slot >= '1' && slot->slot <= '9')
return slot->slot - '0';
return slot->slot;
}
}
return INT_MAX;
}
struct routing_table * pirq_alloc_read_table()
{
struct routing_table *table = NULL;
uint16_t size = 0;
uint8_t checksum = 0;
int i;
void *mem;
off_t offset=0L;
int fd;
/* Skip PIRQ table parsing */
if (nopirq) {
return NULL;
}
fd = open("/dev/mem", O_RDONLY);
if(fd==-1)
return NULL;
mem = mmap(0, 64*1024, PROT_READ, MAP_SHARED, fd, 0xF0000L);
if (mem == (void *)-1LL)
goto out;
while( offset < 0xFFFF)
{
if(memcmp(mem+offset, "$PIR", 4)==0)
{
table = (struct routing_table *)(mem+offset);
size = table->size;
/* quick sanity checks */
if (size == 0) {
table = NULL;
break;
}
/* Version must be 1.0 */
if (!((table->version >> 8) == 1 &&
(table->version & 0xFF) == 0)) {
table = NULL;
break;
}
table = malloc(size);
if (!table) break;
memcpy(table, mem+offset, size);
for (i=0; i<size; i++)
checksum +=*(((uint8_t *)table)+i);
if (checksum) {
free (table);
table = NULL;
}
break;
}
offset += 16;
}
munmap(mem, 64*1024);
out:
close(fd);
return table;
}
void pirq_free_table(struct routing_table *table)
{
if (table)
free(table);
}
#ifdef UNIT_TEST_PIRQ
static void
pirq_unparse_slot(struct slot_entry *slot)
{
printf("Slot %d: PCI %x:%x. ",
slot->slot, slot->bus, PCI_DEVICE(slot->device));
printf("INTA link %x irq %x ", slot->inta_link, slot->inta_irq);
printf("B link %x irq %x ", slot->intb_link, slot->intb_irq);
printf("C link %x irq %x ", slot->intc_link, slot->intc_irq);
printf("D link %x irq %x ", slot->intd_link, slot->intd_irq);
printf("\n");
}
static void
pirq_unparse_routing_table(struct routing_table *table)
{
int i, num_slots;
struct slot_entry *slot;
char buf[5]; buf[4] = 0;
memcpy(buf, &table->signature, 4);
printf("PCI IRQ Routing Table\n");
printf("Signature: %s\n", buf);
printf("Version : %x\n", table->version);
printf("Size : %xh\n", table->size);
printf("Bus : %x\n", table->router_bus);
printf("DevFn : %x\n", table->router_devfn);
printf("Exclusive IRQs : %x\n", table->exclusive_irqs);
printf("Compatible Router: %x\n", table->compatable_router);
num_slots = (table->size - 32) / sizeof(*slot);
slot = &table->slot[0];
for (i=0; i<num_slots; i++) {
pirq_unparse_slot(&slot[i]);
}
}
int main(int argc, char *argv[])
{
struct routing_table *table;
table = pirq_alloc_read_table();
if (!table)
return 1;
pirq_unparse_routing_table(table);
pirq_free_table(table);
return 0;
}
#endif
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