blob: fba7a53b78146b4a97c630de9f053573778ac304 [file] [log] [blame]
/*
* This file is part of the flashrom project.
*
* Copyright (C) 2009 Peter Stuge <peter@stuge.se>
* Copyright (C) 2009 coresystems GmbH
* Copyright (C) 2010 Carl-Daniel Hailfinger
*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "flash.h"
#ifdef __DARWIN__
#include <DirectIO/darwinio.h>
#define MEM_DEV "DirectIO"
void *sys_physmap(unsigned long phys_addr, size_t len)
{
return map_physical(phys_addr, len);
}
/* The OS X driver does not differentiate between mapping types. */
#define sys_physmap_rw_uncached sys_physmap
#define sys_physmap_ro_cached sys_physmap
void physunmap(void *virt_addr, size_t len)
{
unmap_physical(virt_addr, len);
}
#else
#include <sys/mman.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 int fd_mem_cached = -1;
/* For MMIO access. Must be uncached, doesn't make sense to restrict to ro. */
void *sys_physmap_rw_uncached(unsigned long phys_addr, size_t len)
{
void *virt_addr;
if (-1 == fd_mem) {
/* Open the memory device UNCACHED. Important for MMIO. */
if (-1 == (fd_mem = open(MEM_DEV, O_RDWR | O_SYNC))) {
perror("Critical error: open(" MEM_DEV ")");
exit(2);
}
}
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;
}
/* For reading DMI/coreboot/whatever tables. We should never write, and we
* do not care about caching.
*/
void *sys_physmap_ro_cached(unsigned long phys_addr, size_t len)
{
void *virt_addr;
if (-1 == fd_mem_cached) {
/* Open the memory device CACHED. */
if (-1 == (fd_mem_cached = open(MEM_DEV, O_RDWR))) {
perror("Critical error: open(" MEM_DEV ")");
exit(2);
}
}
virt_addr = mmap(0, len, PROT_READ, MAP_SHARED,
fd_mem_cached, (off_t)phys_addr);
return MAP_FAILED == virt_addr ? NULL : virt_addr;
}
void physunmap(void *virt_addr, size_t len)
{
if (len == 0) {
printf_debug("Not unmapping zero size at %p\n", virt_addr);
return;
}
munmap(virt_addr, len);
}
#endif
#define PHYSMAP_NOFAIL 0
#define PHYSMAP_MAYFAIL 1
#define PHYSMAP_RW 0
#define PHYSMAP_RO 1
void *physmap_common(const char *descr, unsigned long phys_addr, size_t len, int mayfail, int readonly)
{
void *virt_addr;
if (len == 0) {
printf_debug("Not mapping %s, zero size at 0x%08lx.\n",
descr, phys_addr);
return NULL;
}
if ((getpagesize() - 1) & len) {
fprintf(stderr, "Mapping %s at 0x%08lx, unaligned size 0x%lx.\n",
descr, phys_addr, (unsigned long)len);
}
if ((getpagesize() - 1) & phys_addr) {
fprintf(stderr, "Mapping %s, 0x%lx bytes at unaligned 0x%08lx.\n",
descr, (unsigned long)len, phys_addr);
}
if (readonly) {
virt_addr = sys_physmap_ro_cached(phys_addr, len);
} else {
virt_addr = sys_physmap_rw_uncached(phys_addr, len);
}
if (NULL == virt_addr) {
if (NULL == descr)
descr = "memory";
fprintf(stderr, "Error accessing %s, 0x%lx bytes at 0x%08lx\n", descr, (unsigned long)len, phys_addr);
perror(MEM_DEV " mmap failed");
if (EINVAL == errno) {
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");
}
if (!mayfail)
exit(3);
}
return virt_addr;
}
void *physmap(const char *descr, unsigned long phys_addr, size_t len)
{
return physmap_common(descr, phys_addr, len, PHYSMAP_NOFAIL, PHYSMAP_RW);
}
void *physmap_try_ro(const char *descr, unsigned long phys_addr, size_t len)
{
return physmap_common(descr, phys_addr, len, PHYSMAP_MAYFAIL, PHYSMAP_RO);
}
#ifdef __linux__
/*
* Reading and writing to MSRs, however requires instructions rdmsr/wrmsr,
* which are ring0 privileged instructions so only the kernel can do the
* read/write. This function, therefore, requires that the msr kernel module
* be loaded to access these instructions from user space using device
* /dev/cpu/0/msr.
*/
static int fd_msr = -1;
msr_t rdmsr(int addr)
{
uint32_t buf[2];
msr_t msr = { 0xffffffff, 0xffffffff };
if (lseek(fd_msr, (off_t) addr, SEEK_SET) == -1) {
perror("Could not lseek() to MSR");
close(fd_msr);
exit(1);
}
if (read(fd_msr, buf, 8) == 8) {
msr.lo = buf[0];
msr.hi = buf[1];
return msr;
}
if (errno != EIO) {
// A severe error.
perror("Could not read() MSR");
close(fd_msr);
exit(1);
}
return msr;
}
int wrmsr(int addr, msr_t msr)
{
if (lseek(fd_msr, (off_t) addr, SEEK_SET) == -1) {
perror("Could not lseek() to MSR");
close(fd_msr);
exit(1);
}
if (write(fd_msr, &msr, 8) != 8 && errno != EIO) {
perror("Could not write() MSR");
close(fd_msr);
exit(1);
}
/* some MSRs must not be written */
if (errno == EIO)
return -1;
return 0;
}
int setup_cpu_msr(int cpu)
{
char msrfilename[64];
memset(msrfilename, 0, 64);
sprintf(msrfilename, "/dev/cpu/%d/msr", cpu);
if (fd_msr != -1) {
printf("MSR was already initialized\n");
return -1;
}
fd_msr = open(msrfilename, O_RDWR);
if (fd_msr < 0) {
perror("Error while opening /dev/cpu/0/msr");
printf("Did you run 'modprobe msr'?\n");
return -1;
}
return 0;
}
void cleanup_cpu_msr(void)
{
if (fd_msr == -1) {
printf("No MSR initialized.\n");
return;
}
close(fd_msr);
/* Clear MSR file descriptor */
fd_msr = -1;
}
#else
#if defined(__FreeBSD__) || defined(__DragonFly__)
#include <sys/ioctl.h>
typedef struct {
int msr;
uint64_t data;
} cpu_msr_args_t;
#define CPU_RDMSR _IOWR('c', 1, cpu_msr_args_t)
#define CPU_WRMSR _IOWR('c', 2, cpu_msr_args_t)
static int fd_msr = -1;
msr_t rdmsr(int addr)
{
cpu_msr_args_t args;
msr_t msr = { 0xffffffff, 0xffffffff };
args.msr = addr;
if (ioctl(fd_msr, CPU_RDMSR, &args) < 0) {
perror("CPU_RDMSR");
close(fd_msr);
exit(1);
}
msr.lo = args.data & 0xffffffff;
msr.hi = args.data >> 32;
return msr;
}
int wrmsr(int addr, msr_t msr)
{
cpu_msr_args_t args;
args.msr = addr;
args.data = (((uint64_t)msr.hi) << 32) | msr.lo;
if (ioctl(fd_msr, CPU_WRMSR, &args) < 0) {
perror("CPU_WRMSR");
close(fd_msr);
exit(1);
}
return 0;
}
int setup_cpu_msr(int cpu)
{
char msrfilename[64];
memset(msrfilename, 0, 64);
sprintf(msrfilename, "/dev/cpu%d", cpu);
if (fd_msr != -1) {
printf("MSR was already initialized\n");
return -1;
}
fd_msr = open(msrfilename, O_RDWR);
if (fd_msr < 0) {
perror("Error while opening /dev/cpu0");
printf("Did you install ports/sysutils/devcpu?\n");
return -1;
}
return 0;
}
void cleanup_cpu_msr(void)
{
if (fd_msr == -1) {
printf("No MSR initialized.\n");
return;
}
close(fd_msr);
/* Clear MSR file descriptor */
fd_msr = -1;
}
#else
#ifdef __DARWIN__
int setup_cpu_msr(int cpu)
{
// Always succeed for now
return 0;
}
void cleanup_cpu_msr(void)
{
// Nothing, yet.
}
#else
msr_t rdmsr(int addr)
{
msr_t ret = { 0xffffffff, 0xffffffff };
return ret;
}
int wrmsr(int addr, msr_t msr)
{
return -1;
}
int setup_cpu_msr(int cpu)
{
printf("No MSR support for your OS yet.\n");
return -1;
}
void cleanup_cpu_msr(void)
{
// Nothing, yet.
}
#endif
#endif
#endif