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