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/* getpir.c : This software is released under GPL
* For coreboot use only
* Aug 26 2001 , Nikolai Vladychevski, <niko@isl.net.mx>
* 2007.04.09 Jeremy Jackson <jerj@coplanar.net>
* updated for amd64 and general 64 bit portability
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "pirq_routing.h"
#include "checksum.h"
#include "code_gen.h"
#if defined (__sun) && (defined(__i386) || defined(__amd64))
# define MEM_DEV "/dev/xsvc"
#else
# define MEM_DEV "/dev/mem"
#endif
static struct irq_routing_table *probe_table(int fd_mem)
{
char *ptr, signature[] = "$PIR";
struct irq_routing_table *rt;
int size = 16;
ptr = mmap(0, 0x10000, PROT_READ, MAP_SHARED,
fd_mem, (off_t) 0xf0000);
if (ptr == MAP_FAILED) {
perror("Mapping system memory failed: ");
return NULL;
}
do {
rt = (struct irq_routing_table *) memmem(ptr + size, 16, signature, 4);
if (rt != NULL) {
printf("Found PCI IRQ routing table signature at %p.\n",
(void *) ((char *) rt - ptr + 0xf0000));
printf("Validating... ");
if (!calc_checksum(rt)) {
printf("checksum is ok.\n");
break;
} else {
printf("checksum is wrong.\n");
}
}
size += 16;
} while (size < 0xFFFF);
if (size >= 0xFFFF) {
printf("No PCI IRQ routing table signature found.\n");
munmap(ptr, 0x10000);
return NULL;
}
return rt;
}
int main(void)
{
int fd_mem;
struct irq_routing_table *rt;
if (getuid()) {
fprintf(stderr, "Run me as root, I need access to " MEM_DEV ".\n");
}
fd_mem = open(MEM_DEV, O_RDONLY);
if (fd_mem < 0) {
perror("Could not open " MEM_DEV ":");
exit(1);
}
printf("Probing PIRQ table in memory.\n");
rt = probe_table(fd_mem);
if (rt != NULL) {
printf("Creating irq_tables.c ...\n");
code_gen("irq_tables.c", rt);
printf
("Done, you can move the file to the coreboot tree now.\n");
}
close(fd_mem);
return 0;
}
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