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/* compile: gcc -s -o bucts bucts.c -lpci or: make
* run as root: ./bucts [0|1]
*/
/*
* Copyright (C) 2011 Peter Stuge <peter@stuge.se>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#if defined(__GLIBC__)
#include <sys/io.h>
#endif
#include <pci/pci.h>
#if defined (__sun) && (defined(__i386) || defined(__amd64))
#define MEM_DEV "/dev/xsvc"
#else
#define MEM_DEV "/dev/mem"
#endif
static int fd_mem=-1;
static void *sys_physmap(unsigned long phys_addr, size_t len) {
void *virt_addr = mmap(0, len, PROT_WRITE|PROT_READ, MAP_SHARED, fd_mem, (off_t)phys_addr);
return MAP_FAILED == virt_addr ? NULL : virt_addr;
}
static void physunmap(void *virt_addr, size_t len) {
if (!len) {
printf("Not unmapping zero size at %p\n", virt_addr);
return;
}
munmap(virt_addr, len);
}
static void *physmap(const char *descr, unsigned long phys_addr, size_t len) {
void *virt_addr;
if (!descr)
descr = "memory";
if (!len) {
printf("Not mapping %s, zero size at 0x%08lx.\n", descr, phys_addr);
return NULL;
}
if ((getpagesize() - 1) & len)
fprintf(stderr, "Unaligned size 0x%lx for %s at 0x%08lx!\n", (unsigned long)len, descr, phys_addr);
if ((getpagesize() - 1) & phys_addr)
fprintf(stderr, "Unaligned address 0x%08lx for %s!\n", phys_addr, descr);
virt_addr = sys_physmap(phys_addr, len);
if (!virt_addr) {
fprintf(stderr, "Error accessing 0x%lx bytes %s at 0x%08lx!\n", (unsigned long)len, descr, phys_addr);
perror("mmap(" MEM_DEV ")");
if (EINVAL == errno) {
fprintf(stderr, "\n");
fprintf(stderr, "In Linux this error can be caused by the CONFIG_NONPROMISC_DEVMEM (<2.6.27),\n");
fprintf(stderr, "CONFIG_STRICT_DEVMEM (>=2.6.27) and CONFIG_X86_PAT kernel options.\n");
fprintf(stderr, "Please check if either is enabled in your kernel before reporting a failure.\n");
fprintf(stderr, "You can override CONFIG_X86_PAT at boot with the nopat kernel parameter but\n");
fprintf(stderr, "disabling the other option unfortunately requires a kernel recompile. Sorry!\n");
}
}
return virt_addr;
}
int bucts(struct pci_dev *sb, int8_t newts) {
uint8_t buc, ts;
uint32_t rcba_addr;
volatile uint8_t *rcba;
const char *str[2]={
"ICH will not invert A16",
"ICH will invert A16 for cycles going to the firmware space"
};
switch (sb->device_id) {
case 0x27b9:
rcba_addr = pci_read_long(sb, 0xf0) & ~1;
break;
default:
fprintf(stderr, "Unsupported LPC bridge. Sorry.\n");
return 1;
}
rcba = physmap("RCBA", rcba_addr, 0x4000);
if (!rcba)
return 1;
buc = rcba[0x3414];
ts = buc & 1;
printf("Current BUC.TS=%d - %s\n", ts, str[ts]);
if (0 == newts || 1 == newts) {
if (ts == newts) {
printf("Not writing BUC register since TS is already correct.\n");
goto unmap;
}
buc &= ~1;
buc |= newts;
rcba[0x3414] = buc;
buc = rcba[0x3414];
ts = buc & 1;
printf("Updated BUC.TS=%d - %s\n", ts, str[ts]);
}
unmap:
physunmap((void *)rcba, 0x4000);
return 0;
}
int main(int argc, const char *argv[], const char *envp[]) {
int ret;
char *endp;
int8_t newts = -1;
struct pci_access *pacc;
struct pci_dev *dev, *sb = NULL;
#if defined(__FreeBSD__)
int io_fd;
#endif
printf("bucts utility version '" VERSION "'\n");
#if defined(__FreeBSD__)
if ((io_fd = open("/dev/io", O_RDWR)) < 0) {
perror("open(/dev/io)");
#else
if (iopl(3)) {
perror("iopl");
#endif
printf("You need to be root.\n");
return 1;
}
if (-1 == (fd_mem = open(MEM_DEV, O_RDWR|O_SYNC))) {
perror("Error: open(" MEM_DEV ")");
return 1;
}
pacc=pci_alloc();
pci_init(pacc);
pci_scan_bus(pacc);
for (dev=pacc->devices; dev && !sb; dev=dev->next) {
pci_fill_info(dev, PCI_FILL_IDENT|PCI_FILL_CLASS);
if (dev->vendor_id != 0x8086 || dev->device_class != 0x0601)
continue;
sb = dev;
}
if (!sb) {
fprintf(stderr, "Error: LPC bridge not found!\n");
return 1;
}
printf("Using LPC bridge %04x:%04x at %02x%02x:%02x.%02x\n", sb->vendor_id, sb->device_id, sb->domain, sb->bus, sb->dev, sb->func);
if (argc > 1) {
newts = strtoul(argv[1], &endp, 10);
if (endp == argv[1]) {
fprintf(stderr, "Invalid new TS value '%s', please specify 0 or 1.\n", argv[1]);
newts = -1;
}
}
ret = bucts(sb, newts);
close(fd_mem);
return ret;
}
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