diff options
Diffstat (limited to 'projects')
| -rw-r--r-- | projects/bucts/sources/Makefile | 20 | ||||
| -rw-r--r-- | projects/bucts/sources/bucts.c | 191 |
2 files changed, 211 insertions, 0 deletions
diff --git a/projects/bucts/sources/Makefile b/projects/bucts/sources/Makefile new file mode 100644 index 00000000..b5f43d5f --- /dev/null +++ b/projects/bucts/sources/Makefile @@ -0,0 +1,20 @@ +CC:=gcc +OBJ:=bucts.o +VERSION:=withoutgit + +ifeq ($(shell uname), FreeBSD) + CFLAGS = -I/usr/local/include + LDFLAGS = -L/usr/local/lib +endif + +all: bucts + +bucts: $(OBJ) + $(CC) -o $@ $(OBJ) $(LDFLAGS) -lpci + +%.o: %.c + $(CC) $(CFLAGS) -DVERSION='"$(VERSION)"' -c $< + +.PHONY: clean +clean: + rm -f bucts $(OBJ) diff --git a/projects/bucts/sources/bucts.c b/projects/bucts/sources/bucts.c new file mode 100644 index 00000000..16e82c7a --- /dev/null +++ b/projects/bucts/sources/bucts.c @@ -0,0 +1,191 @@ +/* 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]={ + "128kb address range 0xFFFE0000-0xFFFFFFFF is untranslated", + "64kb address ranges at 0xFFFE0000 and 0xFFFF0000 are swapped" + }; + + 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; +} |