* 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
+ * 2010.04.24 Marc Bertens <mbertens@xs4all.nl>
+ * Added functionality to read a image file for checking the checksum of the PIR
*/
#include <stdio.h>
# define MEM_DEV "/dev/mem"
#endif
-static struct irq_routing_table *probe_table(int fd_mem)
+/**
+ * The probe_table() is now called with the pointer to the memory,
+ * this is to handle both the assessing memory and a file.
+ *
+ * This function now dumps the table found to the stdout, with
+ * descriptions, it is special handy when building a PIRQ table
+ * for a board to check the checksum.
+ */
+static struct irq_routing_table *probe_table(char* ptr)
{
- char *ptr, signature[] = "$PIR";
- struct irq_routing_table *rt;
+ /**
+ * Signature to search for $PIR<2-byte-version>
+ *
+ * this is to be sure that we find the correct table.
+ */
+ char signature[] = "$PIR\x00\x01";
+ /** cast the pointer */
+ struct irq_routing_table *rt = (struct irq_routing_table *)ptr;
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;
- }
-
+ int checksum_result;
do {
- rt = (struct irq_routing_table *) memmem(ptr + size, 16, signature, 4);
+ /** find the PIRQ table */
+ rt = (struct irq_routing_table *) memmem(ptr + size, 16, signature, 6);
if (rt != NULL) {
- printf("Found PCI IRQ routing table signature at %p.\n",
- (void *) ((char *) rt - ptr + 0xf0000));
- printf("Validating... ");
- if (!calc_checksum(rt)) {
+ /** found the table */
+ int i, ts = (rt->size - 32) / 16;
+ struct irq_info *se_arr;
+ se_arr = (struct irq_info *) ((char *) rt + 32);
+ /** Dump the table information to the stdout */
+ printf("Found PCI IRQ routing table signature at %p.\n", (void *) ((char *) rt - ptr + 0xf0000));
+ printf("SIGNATURE = %s\n", (char*)&rt->signature);
+ printf("VERSION = %04x\n", rt->version);
+ printf("SIZE = %i\n", rt->size);
+ printf("MAX_DEVICES_ON_BUS = 32 + 16 * %d\n", ts);
+ printf("INT_ROUTER_BUS = 0x%02x\n", rt->rtr_bus);
+ printf("INT_ROUTER DEVICE = (0x%02x << 3) | 0x%01x\n", rt->rtr_devfn >> 3, rt->rtr_devfn & 7);
+ printf("IRQ_DEVOTED_TO_PCI = %#x\n", rt->exclusive_irqs);
+ printf("VENDOR = %#x\n", rt->rtr_vendor);
+ printf("DEVICE = %#x\n", rt->rtr_device);
+ printf("MINIPORT = %#x\n", rt->miniport_data);
+ printf("CHECKSUM = %#x\n", rt->checksum);
+ printf("\tbus , dev | fn, {link, bitmap}, {link, bitmap}, {link, bitmap}, {link, bitmap}, slot, rfu\n");
+ for (i = 0; i < ts; i++) {
+ printf("\t0x%02x, (0x%02x << 3) | 0x%01x, {{0x%02x, 0x%04x}, {0x%02x, 0x%04x}, {0x%02x, 0x%04x}, {0x%02x, 0x%04x}}, 0x%x, 0x%x},\n",
+ (se_arr+i)->bus, (se_arr+i)->devfn >> 3,
+ (se_arr+i)->devfn & 7, (se_arr+i)->irq[0].link,
+ (se_arr+i)->irq[0].bitmap, (se_arr+i)->irq[1].link,
+ (se_arr+i)->irq[1].bitmap, (se_arr+i)->irq[2].link,
+ (se_arr+i)->irq[2].bitmap, (se_arr+i)->irq[3].link,
+ (se_arr+i)->irq[3].bitmap, (se_arr+i)->slot,
+ (se_arr+i)->rfu);
+ }
+ /** A table should not be over 0x400 bytes */
+ if (rt->size > 0x400) {
+ return NULL;
+ }
+ printf("Validating...\n");
+ /** Calculate the checksum value */
+ checksum_result = calc_checksum(rt);
+ /** Show the calculatedchecksum value */
+ printf("CHECKSUM = %#x\n", 0x100-((checksum_result - rt->checksum) & 0xFF));
+ /** and the result of the calculation */
+ if (!checksum_result) {
printf("checksum is ok.\n");
break;
} else {
}
size += 16;
} while (size < 0xFFFF);
-
if (size >= 0xFFFF) {
+ /** When the functions comes here there is no PIRQ table found. */
printf("No PCI IRQ routing table signature found.\n");
- munmap(ptr, 0x10000);
return NULL;
}
return rt;
}
-int main(void)
+int main(int argc, char* argv[])
{
- int fd_mem;
- struct irq_routing_table *rt;
-
- if (getuid()) {
- fprintf(stderr, "Run me as root, I need access to " MEM_DEV ".\n");
+ char* ptr;
+ int fd_mem = -1;
+ struct irq_routing_table* rt = NULL;
+ void* bios_image = NULL;
+ if ( argc > 1 )
+ {
+ /** there a paramater passed to the program, assume that it is a menory file */
+ printf("Opening memory image file '%s'\n", argv[1]);
+ /** Open the file */
+ fd_mem = open(argv[1], O_RDONLY);
+ if (fd_mem > 0) {
+ /** get tyhe size of the file */
+ int file_size = lseek(fd_mem, 0, SEEK_END);
+ printf("Memory image '%i'\n", file_size);
+ /** get a memory block for it. */
+ bios_image = malloc(file_size);
+ if (bios_image) {
+ /** Fill the created buffer */
+ lseek(fd_mem, 0, SEEK_SET);
+ read(fd_mem, bios_image, file_size);
+ /** set the pointer for the probe function */
+ ptr = (char*)bios_image;
+ } else {
+ /* no memory available ? */
+ perror("Failed to open imagefile\n");
+ return (-3);
+ }
+ } else {
+ /** An error occourd, just exit with a message */
+ perror("Failed to open imagefile");
+ return (-2);
+ }
+ } else {
+ /** No paramaters means that the program will access the system memory */
+ printf("Accessing memory\n");
+ if (getuid()) {
+ /** i'm not root message !!!! */
+ fprintf(stderr, "Run me as root, I need access to " MEM_DEV ".\n");
+ }
+ /** open the system memory */
+ fd_mem = open(MEM_DEV, O_RDONLY);
+ if (fd_mem < 0) {
+ /** could not open the system memory, exit with a message */
+ perror("Could not open " MEM_DEV ":");
+ exit(1);
+ }
+ printf("Probing PIRQ table in memory.\n");
+ ptr = mmap(0, 0x10000, PROT_READ, MAP_SHARED, fd_mem, (off_t)0xf0000);
+ if (ptr == MAP_FAILED) {
+ /** could not map the system memory, exit with a message */
+ perror("Mapping system memory failed: ");
+ close(fd_mem);
+ return (1);
+ }
}
-
- fd_mem = open(MEM_DEV, O_RDONLY);
- if (fd_mem < 0) {
- perror("Could not open " MEM_DEV ":");
- exit(1);
+ if (ptr) {
+ /** now do the actual probe function */
+ rt = probe_table(ptr);
+ if (rt != NULL && bios_image == NULL) {
+ /** when probing system memory we write the 'irq_tables.c' code file */
+ 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");
+ }
+ } else {
+ printf("invalid memory pointer\n");
}
-
- 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");
+ if (bios_image) {
+ /** when we are reading from a file the memory must be released */
+ free(bios_image);
+ } else {
+ /** when reading from the system memory, it must be unmapped */
+ munmap(ptr, 0x10000);
}
+ /** Close the file handle */
close(fd_mem);
-
-
+ /** return 0 as OK ) */
return 0;
}
projects / coreboot.git / commitdiff