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/* getpir.c : This software is released under GPL
For Linuxbios use only
Aug 26 2001 , Nikolai Vladychevski, <niko@isl.net.mx>
*/
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <device/pci.h>
#include <pirq_routing.h>
#define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
#define PIRQ_VERS 0x0100
struct irq_info se_arr[50];
struct irq_routing_table rt;
unsigned short ts;
int calc_checksum()
{
long sum = 0, i, j;
uint8_t *addr, sum2 = 0, data;
addr = (uint8_t *) & rt;
for (i = 0; i < sizeof(struct irq_routing_table); i++)
sum2 += addr[i];
for (i = 0; i < ts; i++) {
addr = (uint8_t *) & se_arr[i];
for (j = 0; j < sizeof(struct irq_info); j++)
sum2 += addr[j];
}
return (sum2);
}
main()
{
FILE *fmem, *fpir;
size_t rcount = 0;
unsigned long b, p, pir = PIRQ_SIGNATURE;
unsigned long count;
int i, valid = 1, print = 0;
char cksum = 0;
unsigned char *ptr;
if (getuid()) {
perror("Run me as root, I need access to /dev/mem");
exit(1);
}
printf("Opening memory...\n");
fmem = fopen("/dev/mem", "r");
do {
rcount = fread(&b, 1, 4, fmem);
if (rcount > 0) {
if (b == pir) {
valid = 1;
printf("Found PCI IRQ Routing table signature at %x bytes from top of the memory\nValidating../\n",
count);
rt.signature = PIRQ_SIGNATURE;
ptr = (char *) &rt;
ptr = ptr + 4; // signature was read, advance 4 bytes
rcount = fread(ptr, 1, sizeof(struct irq_routing_table) - 4, fmem);
count = count + rcount;
printf("Version is:%d Table size:%d\n",
rt.version, rt.size);
if (rt.version != PIRQ_VERS) {
printf("Invalid version\n");
valid = 0;
}
if (rt.size < 32) {
printf(" Invalid table size\n");
valid = 0;
}
if (rt.size % 16) {
printf(" Invalid table size (not a multiple of 16)\n");
valid = 0;
}
if (valid) {
// read slot entries
ts = (rt.size - 32) / 16;
printf("Reading %d slot entries...\n", ts);
for (i = 0; i < ts; i++) {
rcount =
fread(&se_arr[i], 1, 16, fmem);
count = count + rcount;
}
print = 1;
break;
}
} else {
count = count + rcount;
}
}
} while (rcount > 0);
if (!calc_checksum())
printf("Checksum is ok!\n");
printf("Closing memory\n");
fclose(fmem);
if (!print) {
printf("No table for you...\n");
return (0);
}
printf("Creating irq_tables.c .....\n");
fpir = fopen("irq_tables.c", "w");
if (!fpir) {
printf("Failed creating file!\n");
exit(2);
}
fprintf(fpir, "/* This file was generated by getpir.c, do not modify! \n (but if you do, please run checkpir on it to verify)\n");
fprintf(fpir, " Contains the IRQ Routing Table dumped directly from your memory , wich BIOS sets up\n\n");
fprintf(fpir, " Documentation at : http://www.microsoft.com/hwdev/busbios/PCIIRQ.HTM\n*/\n\n");
fprintf(fpir, "#include <arch/pirq_routing.h>\n\n");
fprintf(fpir, "const struct irq_routing_table intel_irq_routing_table = {\n");
fprintf(fpir, "\tPIRQ_SIGNATURE, /* u32 signature */\n");
fprintf(fpir, "\tPIRQ_VERSION, /* u16 version */\n");
fprintf(fpir, "\t32+16*%d, /* there can be total %d devices on the bus */\n",
ts, ts);
fprintf(fpir, "\t0x%02x, /* Where the interrupt router lies (bus) */\n",
rt.rtr_bus);
fprintf(fpir, "\t(0x%02x<<3)|0x%01x, /* Where the interrupt router lies (dev) */\n",
rt.rtr_devfn >> 3, rt.rtr_devfn & 7);
fprintf(fpir, "\t%#x, /* IRQs devoted exclusively to PCI usage */\n",
rt.exclusive_irqs);
fprintf(fpir, "\t%#x, /* Vendor */\n", rt.rtr_vendor);
fprintf(fpir, "\t%#x, /* Device */\n", rt.rtr_device);
fprintf(fpir, "\t%#x, /* Crap (miniport) */\n",
rt.miniport_data);
fprintf(fpir, "\t{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* u8 rfu[11] */\n");
fprintf(fpir, "\t%#x, /* u8 checksum , this hase to set to some value that would give 0 after the sum of all bytes for this structure (including checksum) */\n",
rt.checksum);
fprintf(fpir, "\t{\n");
fprintf(fpir, "\t\t/* bus, dev|fn, {link, bitmap}, {link, bitmap}, {link, bitmap}, {link, bitmap}, slot, rfu */\n");
for (i = 0; i < ts; i++) {
fprintf(fpir, "\t\t{0x%02x,(0x%02x<<3)|0x%01x, {{0x%02x, 0x%04x}, {0x%02x, 0x%04x}, {0x%02x, 0x%04x}, {0x%02x, 0x0%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);
}
fprintf(fpir, "\t}\n");
fprintf(fpir, "};\n");
fclose(fpir);
printf("Done, you can move the file to the LinuxBios tree now.\n");
}
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