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/* reloads an nvidia card's 0xc0000 bios with a valid copy for execution
* (all done in a copy of system memory, no bios overwriting involved)
*
* portions of code below taken from Nouveau's nv_bios.c and nvclock
* and are copyright their respective authors
*/
#include <fcntl.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>
#include "x86emu.h"
#define Bool bool
#define TRUE true
#define FALSE false
#define ScrnInfoPtr void *
#define VBIOS_ROM 0xc0000
#define NV_PROM_SIZE 0x10000
static uint32_t *PMC;
static uint32_t *PRAMIN;
static uint8_t *PROM;
static uint32_t *PNV50;
static void *map_dev_mem (int fd, unsigned long Base, unsigned long Size)
{
void *base;
int mapflags = MAP_SHARED;
unsigned long realBase, alignOff;
realBase = Base & ~(getpagesize() - 1);
alignOff = Base - realBase;
base = mmap((caddr_t)0, Size + alignOff, PROT_READ|PROT_WRITE,
mapflags, fd, (off_t)realBase);
return (void *) ((char *)base + alignOff);
}
static void unmap_dev_mem (unsigned long Base, unsigned long Size)
{
unsigned long alignOff = Base - (Base & ~(getpagesize() - 1));
munmap((caddr_t)(Base - alignOff), (Size + alignOff));
}
static Bool nv_cksum(const uint8_t *data, unsigned int length)
{
/* there's a few checksums in the BIOS, so here's a generic checking function */
int i;
uint8_t sum = 0;
for (i = 0; i < length; i++)
sum += data[i];
if (sum)
return TRUE;
return FALSE;
}
static Bool NVValidVBIOS(ScrnInfoPtr pScrn, const uint8_t *data)
{
/* check for BIOS signature */
if (!(data[0] == 0x55 && data[1] == 0xAA)) {
printf("... BIOS signature not found\n");
return FALSE;
}
if (nv_cksum(data, data[2] * 512)) {
printf("... BIOS checksum invalid\n");
return FALSE;
} else
printf( "... appears to be valid\n");
return TRUE;
}
static void NVShadowVBIOS_PROM(ScrnInfoPtr pScrn, uint8_t *data)
{
int i;
printf("Attempting to locate BIOS image in PROM");
/* enable ROM access */
PMC[0x1850 / 4] = 0x0;
for (i = 0; i < NV_PROM_SIZE; i++) {
/* according to nvclock, we need that to work around a 6600GT/6800LE bug */
data[i] = PROM[i];
data[i] = PROM[i];
data[i] = PROM[i];
data[i] = PROM[i];
data[i] = PROM[i];
}
/* disable ROM access */
PMC[0x1850 / 4] = 0x1;
}
static void NVShadowVBIOS_PRAMIN(ScrnInfoPtr pScrn, uint32_t *data)
{
const uint32_t *pramin = PRAMIN;
int arch = PMC[0] >> 20 & 0x1ff;
uint32_t old_bar0_pramin = 0;
printf("Attempting to locate BIOS image in PRAMIN");
if (arch > 0x50) {
uint32_t vbios_vram;
vbios_vram = (PNV50[0x9f04/4] & ~0xff) << 8;
if (!vbios_vram) {
vbios_vram = PMC[0x1700/4] << 16;
vbios_vram += 0xf0000;
}
old_bar0_pramin = PMC[0x1700/4];
PMC[0x1700/4] = vbios_vram >> 16;
}
memcpy(data, pramin, NV_PROM_SIZE);
if (arch > 0x50)
PMC[0x1700/4] = old_bar0_pramin;
}
static Bool NVShadowVBIOS(ScrnInfoPtr pScrn, uint32_t *data)
{
NVShadowVBIOS_PROM(pScrn, (uint8_t *)data);
if (NVValidVBIOS(pScrn, (uint8_t *)data))
return TRUE;
NVShadowVBIOS_PRAMIN(pScrn, data);
if (NVValidVBIOS(pScrn, (uint8_t *)data))
return TRUE;
return FALSE;
}
int mmap_in_bios(uint8_t *bios)
{
int zfd, i;
if ((zfd = open("/dev/zero", O_RDWR)) == -1) {
printf("Can't open /dev/zero\n");
return 1;
}
mmap((void *)VBIOS_ROM, NV_PROM_SIZE,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_FIXED | MAP_SHARED, zfd, 0);
close(zfd);
for (i = 0; i < NV_PROM_SIZE; i++)
*((uint8_t *)VBIOS_ROM + i) = bios[i];
return 0;
}
int reload_nv_bios(uintptr_t pcimemaddr)
{
int fd;
uint8_t bios[NV_PROM_SIZE];
int ret = 0;
if ((fd = open("/dev/mem", O_RDWR)) == -1) {
printf("Can't open /dev/mem\n");
return 1;
}
printf("Using card memory region at %p\n", (void *)pcimemaddr);
PMC = map_dev_mem(fd, pcimemaddr + 0x000000, 0x2000);
PRAMIN = map_dev_mem(fd, pcimemaddr + 0x700000, NV_PROM_SIZE);
PROM = map_dev_mem(fd, pcimemaddr + 0x300000, NV_PROM_SIZE);
PNV50 = map_dev_mem(fd, pcimemaddr + 0x610000, 0xffff);
close(fd);
if (NVShadowVBIOS(NULL, (uint32_t *)bios)) {
if (mmap_in_bios(bios))
ret = 1;
} else
ret = 1;
unmap_dev_mem((unsigned long)PMC, 0x2000);
unmap_dev_mem((unsigned long)PRAMIN, NV_PROM_SIZE);
unmap_dev_mem((unsigned long)PROM, NV_PROM_SIZE);
unmap_dev_mem((unsigned long)PNV50, 0xffff);
return ret;
}
int reload_bios_from_file(char *romfile)
{
uint8_t bios[NV_PROM_SIZE];
FILE *romf;
if (!(romf = fopen(romfile, "r"))) {
printf("File open failed\n");
return 1;
}
fread(bios, NV_PROM_SIZE, 1, romf);
fclose(romf);
if (!NVValidVBIOS(NULL, bios))
return 1;
printf("Loading contents of %s as bios image to be used, unless ^C is hit in next 5s\n", romfile);
sleep(5);
if (mmap_in_bios(bios))
return 1;
return 0;
}
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