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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 NV_PROM_SIZE 0x10000
static uint32_t *PMC;
static uint32_t *PRAMIN;
static uint8_t *PROM;
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 offset, 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[offset + 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, 0, 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\n");
/* 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 Bool NVShadowVBIOS(ScrnInfoPtr pScrn, uint8_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 fake_bios(int fd, uint8_t *bios)
{
uint8_t *emumem, *sysmem;
int i;
/* this does not get free'd until exit */
if (!(emumem = malloc(1024 * 1024))) {
printf("Couldn't allocate fake system memory\n");
return 1;
}
sysmem = map_dev_mem(fd, 0, 1024*1024);
for (i = 0; i < 1024*1024; i++)
emumem[i] = sysmem[i];
for (i = 0; i < NV_PROM_SIZE; i++)
emumem[0xc0000 + i] = bios[i];
unmap_dev_mem((unsigned long)sysmem, 1024*1024);
M.mem_base = (int)emumem;
return 0;
}
int reload_nv_bios()
{
int fd;
uint8_t bios[NV_PROM_SIZE];
if( (fd = open("/dev/mem", O_RDWR)) == -1 ) {
printf("Can't open /dev/mem\n");
return 0;
}
unsigned int reg_address = 0xe5000000; // FIXME
PMC = map_dev_mem(fd, reg_address + 0x000000, NV_PROM_SIZE);
PRAMIN = map_dev_mem(fd, reg_address + 0x700000, NV_PROM_SIZE);
PROM = map_dev_mem(fd, reg_address + 0x300000, NV_PROM_SIZE);
if (NVShadowVBIOS(NULL, bios)) {
if (fake_bios(fd, bios))
return 1;
} else
return 1;
close(fd);
unmap_dev_mem((unsigned long)PMC, NV_PROM_SIZE);
unmap_dev_mem((unsigned long)PRAMIN, NV_PROM_SIZE);
unmap_dev_mem((unsigned long)PROM, NV_PROM_SIZE);
return 0;
}
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