blob: e54dee41f05af24cd1ef8a2fc8679c8fa7387b69 [file] [log] [blame]
Peter Stuge33fefca2009-01-26 01:33:02 +00001/*
2 * This file is part of the flashrom project.
3 *
4 * Copyright (C) 2009 Peter Stuge <peter@stuge.se>
Stefan Reinauer8fa64812009-08-12 09:27:45 +00005 * Copyright (C) 2009 coresystems GmbH
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +00006 * Copyright (C) 2010 Carl-Daniel Hailfinger
Rudolf Marek03ae5c12010-03-16 23:59:19 +00007 * Copyright (C) 2010 Rudolf Marek <r.marek@assembler.cz>
Peter Stuge33fefca2009-01-26 01:33:02 +00008 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 */
Uwe Hermann7b2969b2009-04-15 10:52:49 +000022
Carl-Daniel Hailfinger831e8f42010-05-30 22:24:40 +000023#include <unistd.h>
24#include <stdio.h>
Stefan Reinauer0593f212009-01-26 01:10:48 +000025#include <stdlib.h>
Stefan Reinauer8fa64812009-08-12 09:27:45 +000026#include <string.h>
Stefan Reinauer0593f212009-01-26 01:10:48 +000027#include "flash.h"
28
Carl-Daniel Hailfingerdcef67e2010-06-21 23:20:15 +000029/* Do we need any file access or ioctl for physmap or MSR? */
Patrick Georgia9095a92010-09-30 17:03:32 +000030#if !defined(__DJGPP__) && !defined(__LIBPAYLOAD__)
Carl-Daniel Hailfingerdcef67e2010-06-21 23:20:15 +000031#include <sys/stat.h>
32#include <fcntl.h>
33#include <errno.h>
34#endif
35
Rudolf Marek03ae5c12010-03-16 23:59:19 +000036#ifdef __DJGPP__
37#include <dpmi.h>
Rudolf Marek837d8102010-04-25 22:47:50 +000038#include <sys/nearptr.h>
Rudolf Marek03ae5c12010-03-16 23:59:19 +000039
40#define MEM_DEV "dpmi"
41
Rudolf Marek837d8102010-04-25 22:47:50 +000042static void *realmem_map;
43
44static void *map_first_meg(unsigned long phys_addr, size_t len)
45{
Uwe Hermann91f4afa2011-07-28 08:13:25 +000046 if (realmem_map)
Rudolf Marek837d8102010-04-25 22:47:50 +000047 return realmem_map + phys_addr;
Rudolf Marek837d8102010-04-25 22:47:50 +000048
49 realmem_map = valloc(1024 * 1024);
50
Uwe Hermann91f4afa2011-07-28 08:13:25 +000051 if (!realmem_map)
Patrick Georgied7a9642010-09-25 22:53:44 +000052 return ERROR_PTR;
Rudolf Marek837d8102010-04-25 22:47:50 +000053
54 if (__djgpp_map_physical_memory(realmem_map, (1024 * 1024), 0)) {
Carl-Daniel Hailfinger602de982010-10-05 23:21:51 +000055 free(realmem_map);
56 realmem_map = NULL;
Patrick Georgied7a9642010-09-25 22:53:44 +000057 return ERROR_PTR;
Rudolf Marek837d8102010-04-25 22:47:50 +000058 }
59
60 return realmem_map + phys_addr;
61}
Rudolf Marek03ae5c12010-03-16 23:59:19 +000062
Carl-Daniel Hailfingerad3cc552010-07-03 11:02:10 +000063static void *sys_physmap(unsigned long phys_addr, size_t len)
Rudolf Marek03ae5c12010-03-16 23:59:19 +000064{
65 int ret;
66 __dpmi_meminfo mi;
67
Uwe Hermann91f4afa2011-07-28 08:13:25 +000068 /* Enable 4GB limit on DS descriptor. */
69 if (!__djgpp_nearptr_enable())
Patrick Georgied7a9642010-09-25 22:53:44 +000070 return ERROR_PTR;
Rudolf Marek837d8102010-04-25 22:47:50 +000071
72 if ((phys_addr + len - 1) < (1024 * 1024)) {
Uwe Hermann91f4afa2011-07-28 08:13:25 +000073 /* We need to use another method to map first 1MB. */
Rudolf Marek837d8102010-04-25 22:47:50 +000074 return map_first_meg(phys_addr, len);
Rudolf Marek03ae5c12010-03-16 23:59:19 +000075 }
76
77 mi.address = phys_addr;
78 mi.size = len;
Carl-Daniel Hailfinger082c8b52011-08-15 19:54:20 +000079 ret = __dpmi_physical_address_mapping(&mi);
Rudolf Marek03ae5c12010-03-16 23:59:19 +000080
Uwe Hermann91f4afa2011-07-28 08:13:25 +000081 if (ret != 0)
Patrick Georgied7a9642010-09-25 22:53:44 +000082 return ERROR_PTR;
Rudolf Marek03ae5c12010-03-16 23:59:19 +000083
Rudolf Marek837d8102010-04-25 22:47:50 +000084 return (void *) mi.address + __djgpp_conventional_base;
Rudolf Marek03ae5c12010-03-16 23:59:19 +000085}
86
87#define sys_physmap_rw_uncached sys_physmap
Rudolf Marek837d8102010-04-25 22:47:50 +000088#define sys_physmap_ro_cached sys_physmap
Rudolf Marek03ae5c12010-03-16 23:59:19 +000089
90void physunmap(void *virt_addr, size_t len)
91{
92 __dpmi_meminfo mi;
93
Carl-Daniel Hailfinger602de982010-10-05 23:21:51 +000094 /* There is no known way to unmap the first 1 MB. The DPMI server will
95 * do this for us on exit.
96 */
Uwe Hermann91f4afa2011-07-28 08:13:25 +000097 if ((virt_addr >= realmem_map) &&
98 ((virt_addr + len) <= (realmem_map + (1024 * 1024)))) {
Rudolf Marek03ae5c12010-03-16 23:59:19 +000099 return;
100 }
101
102 mi.address = (unsigned long) virt_addr;
103 __dpmi_free_physical_address_mapping(&mi);
104}
105
Patrick Georgia9095a92010-09-30 17:03:32 +0000106#elif defined(__LIBPAYLOAD__)
107#include <arch/virtual.h>
108
109#define MEM_DEV ""
110
111void *sys_physmap(unsigned long phys_addr, size_t len)
112{
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000113 return (void *)phys_to_virt(phys_addr);
Patrick Georgia9095a92010-09-30 17:03:32 +0000114}
115
116#define sys_physmap_rw_uncached sys_physmap
117#define sys_physmap_ro_cached sys_physmap
118
119void physunmap(void *virt_addr, size_t len)
120{
121}
122
123int setup_cpu_msr(int cpu)
124{
125 return 0;
126}
127
128void cleanup_cpu_msr(void)
129{
130}
Rudolf Marek03ae5c12010-03-16 23:59:19 +0000131#elif defined(__DARWIN__)
132
Stefan Reinauer83704c52011-03-18 22:00:15 +0000133#define MEM_DEV "DirectHW"
Stefan Reinauerf79edb92009-01-26 01:23:31 +0000134
Carl-Daniel Hailfingerad3cc552010-07-03 11:02:10 +0000135static void *sys_physmap(unsigned long phys_addr, size_t len)
Stefan Reinauerf79edb92009-01-26 01:23:31 +0000136{
Patrick Georgied7a9642010-09-25 22:53:44 +0000137 /* The short form of ?: is a GNU extension.
138 * FIXME: map_physical returns NULL both for errors and for success
139 * if the region is mapped at virtual address zero. If in doubt, report
140 * an error until a better interface exists.
141 */
142 return map_physical(phys_addr, len) ? : ERROR_PTR;
Stefan Reinauerf79edb92009-01-26 01:23:31 +0000143}
144
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000145/* The OS X driver does not differentiate between mapping types. */
146#define sys_physmap_rw_uncached sys_physmap
147#define sys_physmap_ro_cached sys_physmap
148
Stefan Reinauerf79edb92009-01-26 01:23:31 +0000149void physunmap(void *virt_addr, size_t len)
150{
151 unmap_physical(virt_addr, len);
152}
153
154#else
155#include <sys/mman.h>
156
Stefan Reinauer0593f212009-01-26 01:10:48 +0000157#if defined (__sun) && (defined(__i386) || defined(__amd64))
158# define MEM_DEV "/dev/xsvc"
159#else
160# define MEM_DEV "/dev/mem"
161#endif
162
163static int fd_mem = -1;
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000164static int fd_mem_cached = -1;
Stefan Reinauer0593f212009-01-26 01:10:48 +0000165
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000166/* For MMIO access. Must be uncached, doesn't make sense to restrict to ro. */
Carl-Daniel Hailfingerad3cc552010-07-03 11:02:10 +0000167static void *sys_physmap_rw_uncached(unsigned long phys_addr, size_t len)
Stefan Reinauer0593f212009-01-26 01:10:48 +0000168{
169 void *virt_addr;
170
171 if (-1 == fd_mem) {
172 /* Open the memory device UNCACHED. Important for MMIO. */
Uwe Hermann7b2969b2009-04-15 10:52:49 +0000173 if (-1 == (fd_mem = open(MEM_DEV, O_RDWR | O_SYNC))) {
Stefan Reinauer0593f212009-01-26 01:10:48 +0000174 perror("Critical error: open(" MEM_DEV ")");
Peter Stuge43438ba2009-01-26 02:04:19 +0000175 exit(2);
Stefan Reinauer0593f212009-01-26 01:10:48 +0000176 }
177 }
178
Peter Huewe73f8ec82011-01-24 19:15:51 +0000179 virt_addr = mmap(NULL, len, PROT_WRITE | PROT_READ, MAP_SHARED,
Uwe Hermann7b2969b2009-04-15 10:52:49 +0000180 fd_mem, (off_t)phys_addr);
Patrick Georgied7a9642010-09-25 22:53:44 +0000181 return MAP_FAILED == virt_addr ? ERROR_PTR : virt_addr;
Stefan Reinauer0593f212009-01-26 01:10:48 +0000182}
183
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000184/* For reading DMI/coreboot/whatever tables. We should never write, and we
185 * do not care about caching.
186 */
Carl-Daniel Hailfingerad3cc552010-07-03 11:02:10 +0000187static void *sys_physmap_ro_cached(unsigned long phys_addr, size_t len)
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000188{
189 void *virt_addr;
190
191 if (-1 == fd_mem_cached) {
192 /* Open the memory device CACHED. */
193 if (-1 == (fd_mem_cached = open(MEM_DEV, O_RDWR))) {
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000194 msg_perr("Critical error: open(" MEM_DEV "): %s",
195 strerror(errno));
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000196 exit(2);
197 }
198 }
199
Peter Huewe73f8ec82011-01-24 19:15:51 +0000200 virt_addr = mmap(NULL, len, PROT_READ, MAP_SHARED,
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000201 fd_mem_cached, (off_t)phys_addr);
Patrick Georgied7a9642010-09-25 22:53:44 +0000202 return MAP_FAILED == virt_addr ? ERROR_PTR : virt_addr;
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000203}
204
Stefan Reinauer0593f212009-01-26 01:10:48 +0000205void physunmap(void *virt_addr, size_t len)
206{
Carl-Daniel Hailfinger1455b2b2009-05-11 14:13:25 +0000207 if (len == 0) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000208 msg_pspew("Not unmapping zero size at %p\n", virt_addr);
Carl-Daniel Hailfinger1455b2b2009-05-11 14:13:25 +0000209 return;
210 }
211
Stefan Reinauer0593f212009-01-26 01:10:48 +0000212 munmap(virt_addr, len);
213}
Stefan Reinauerf79edb92009-01-26 01:23:31 +0000214#endif
Stefan Reinauer0593f212009-01-26 01:10:48 +0000215
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000216#define PHYSMAP_NOFAIL 0
217#define PHYSMAP_MAYFAIL 1
218#define PHYSMAP_RW 0
219#define PHYSMAP_RO 1
220
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000221static void *physmap_common(const char *descr, unsigned long phys_addr,
222 size_t len, int mayfail, int readonly)
Stefan Reinauer0593f212009-01-26 01:10:48 +0000223{
Stephan Guilloux6d08a3e2009-06-23 10:44:36 +0000224 void *virt_addr;
225
Carl-Daniel Hailfinger1455b2b2009-05-11 14:13:25 +0000226 if (len == 0) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000227 msg_pspew("Not mapping %s, zero size at 0x%08lx.\n",
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000228 descr, phys_addr);
Patrick Georgied7a9642010-09-25 22:53:44 +0000229 return ERROR_PTR;
Carl-Daniel Hailfinger1455b2b2009-05-11 14:13:25 +0000230 }
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000231
Carl-Daniel Hailfinger1455b2b2009-05-11 14:13:25 +0000232 if ((getpagesize() - 1) & len) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000233 msg_perr("Mapping %s at 0x%08lx, unaligned size 0x%lx.\n",
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000234 descr, phys_addr, (unsigned long)len);
Carl-Daniel Hailfinger1455b2b2009-05-11 14:13:25 +0000235 }
236
237 if ((getpagesize() - 1) & phys_addr) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000238 msg_perr("Mapping %s, 0x%lx bytes at unaligned 0x%08lx.\n",
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000239 descr, (unsigned long)len, phys_addr);
Carl-Daniel Hailfinger1455b2b2009-05-11 14:13:25 +0000240 }
241
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000242 if (readonly)
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000243 virt_addr = sys_physmap_ro_cached(phys_addr, len);
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000244 else
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000245 virt_addr = sys_physmap_rw_uncached(phys_addr, len);
Stefan Reinauer0593f212009-01-26 01:10:48 +0000246
Patrick Georgied7a9642010-09-25 22:53:44 +0000247 if (ERROR_PTR == virt_addr) {
Stefan Reinauer0593f212009-01-26 01:10:48 +0000248 if (NULL == descr)
249 descr = "memory";
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000250 msg_perr("Error accessing %s, 0x%lx bytes at 0x%08lx\n", descr,
251 (unsigned long)len, phys_addr);
Stefan Reinauer0593f212009-01-26 01:10:48 +0000252 perror(MEM_DEV " mmap failed");
Sean Nelson316a29f2010-05-07 20:09:04 +0000253#ifdef __linux__
Stefan Reinauer0593f212009-01-26 01:10:48 +0000254 if (EINVAL == errno) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000255 msg_perr("In Linux this error can be caused by the CONFIG_NONPROMISC_DEVMEM (<2.6.27),\n");
256 msg_perr("CONFIG_STRICT_DEVMEM (>=2.6.27) and CONFIG_X86_PAT kernel options.\n");
257 msg_perr("Please check if either is enabled in your kernel before reporting a failure.\n");
258 msg_perr("You can override CONFIG_X86_PAT at boot with the nopat kernel parameter but\n");
259 msg_perr("disabling the other option unfortunately requires a kernel recompile. Sorry!\n");
Stefan Reinauer0593f212009-01-26 01:10:48 +0000260 }
Carl-Daniel Hailfingerb63b0672010-07-02 17:12:50 +0000261#elif defined (__OpenBSD__)
262 msg_perr("Please set securelevel=-1 in /etc/rc.securelevel "
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000263 "and reboot, or reboot into\n"
264 "single user mode.\n");
Sean Nelson316a29f2010-05-07 20:09:04 +0000265#endif
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000266 if (!mayfail)
267 exit(3);
Stefan Reinauer0593f212009-01-26 01:10:48 +0000268 }
269
270 return virt_addr;
271}
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000272
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000273void *physmap(const char *descr, unsigned long phys_addr, size_t len)
274{
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000275 return physmap_common(descr, phys_addr, len, PHYSMAP_NOFAIL,
276 PHYSMAP_RW);
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000277}
278
279void *physmap_try_ro(const char *descr, unsigned long phys_addr, size_t len)
280{
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000281 return physmap_common(descr, phys_addr, len, PHYSMAP_MAYFAIL,
282 PHYSMAP_RO);
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000283}
284
Carl-Daniel Hailfingercceafa22010-05-26 01:45:41 +0000285#if defined(__i386__) || defined(__x86_64__)
286
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000287#ifdef __linux__
288/*
289 * Reading and writing to MSRs, however requires instructions rdmsr/wrmsr,
290 * which are ring0 privileged instructions so only the kernel can do the
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000291 * read/write. This function, therefore, requires that the msr kernel module
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000292 * be loaded to access these instructions from user space using device
293 * /dev/cpu/0/msr.
294 */
295
296static int fd_msr = -1;
297
298msr_t rdmsr(int addr)
299{
Stefan Reinauer95e892b2009-09-04 13:57:07 +0000300 uint32_t buf[2];
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000301 msr_t msr = { 0xffffffff, 0xffffffff };
302
303 if (lseek(fd_msr, (off_t) addr, SEEK_SET) == -1) {
304 perror("Could not lseek() to MSR");
305 close(fd_msr);
306 exit(1);
307 }
308
309 if (read(fd_msr, buf, 8) == 8) {
Stefan Reinauer95e892b2009-09-04 13:57:07 +0000310 msr.lo = buf[0];
311 msr.hi = buf[1];
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000312 return msr;
313 }
314
315 if (errno != EIO) {
316 // A severe error.
317 perror("Could not read() MSR");
318 close(fd_msr);
319 exit(1);
320 }
321
322 return msr;
323}
324
325int wrmsr(int addr, msr_t msr)
326{
Anti Sullinbe24d812010-05-17 23:19:22 +0000327 uint32_t buf[2];
328 buf[0] = msr.lo;
329 buf[1] = msr.hi;
330
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000331 if (lseek(fd_msr, (off_t) addr, SEEK_SET) == -1) {
332 perror("Could not lseek() to MSR");
333 close(fd_msr);
334 exit(1);
335 }
336
Anti Sullinbe24d812010-05-17 23:19:22 +0000337 if (write(fd_msr, buf, 8) != 8 && errno != EIO) {
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000338 perror("Could not write() MSR");
339 close(fd_msr);
340 exit(1);
341 }
342
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000343 /* Some MSRs must not be written. */
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000344 if (errno == EIO)
345 return -1;
346
347 return 0;
348}
349
350int setup_cpu_msr(int cpu)
351{
352 char msrfilename[64];
Carl-Daniel Hailfinger831e8f42010-05-30 22:24:40 +0000353 memset(msrfilename, 0, sizeof(msrfilename));
354 snprintf(msrfilename, sizeof(msrfilename), "/dev/cpu/%d/msr", cpu);
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000355
356 if (fd_msr != -1) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000357 msg_pinfo("MSR was already initialized\n");
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000358 return -1;
359 }
360
361 fd_msr = open(msrfilename, O_RDWR);
362
363 if (fd_msr < 0) {
364 perror("Error while opening /dev/cpu/0/msr");
Sean Nelson316a29f2010-05-07 20:09:04 +0000365 msg_pinfo("Did you run 'modprobe msr'?\n");
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000366 return -1;
367 }
368
369 return 0;
370}
371
372void cleanup_cpu_msr(void)
373{
374 if (fd_msr == -1) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000375 msg_pinfo("No MSR initialized.\n");
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000376 return;
377 }
378
379 close(fd_msr);
380
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000381 /* Clear MSR file descriptor. */
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000382 fd_msr = -1;
383}
384#else
Carl-Daniel Hailfingera5eecda2012-02-25 22:50:21 +0000385#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
Stefan Reinauer173e3ea2009-08-19 10:46:23 +0000386#include <sys/ioctl.h>
387
388typedef struct {
389 int msr;
390 uint64_t data;
391} cpu_msr_args_t;
392#define CPU_RDMSR _IOWR('c', 1, cpu_msr_args_t)
393#define CPU_WRMSR _IOWR('c', 2, cpu_msr_args_t)
394
395static int fd_msr = -1;
396
397msr_t rdmsr(int addr)
398{
399 cpu_msr_args_t args;
400
401 msr_t msr = { 0xffffffff, 0xffffffff };
402
403 args.msr = addr;
404
405 if (ioctl(fd_msr, CPU_RDMSR, &args) < 0) {
406 perror("CPU_RDMSR");
407 close(fd_msr);
408 exit(1);
409 }
410
411 msr.lo = args.data & 0xffffffff;
412 msr.hi = args.data >> 32;
413
414 return msr;
415}
416
417int wrmsr(int addr, msr_t msr)
418{
419 cpu_msr_args_t args;
420
421 args.msr = addr;
422 args.data = (((uint64_t)msr.hi) << 32) | msr.lo;
423
424 if (ioctl(fd_msr, CPU_WRMSR, &args) < 0) {
425 perror("CPU_WRMSR");
426 close(fd_msr);
427 exit(1);
428 }
429
430 return 0;
431}
432
433int setup_cpu_msr(int cpu)
434{
435 char msrfilename[64];
Carl-Daniel Hailfinger831e8f42010-05-30 22:24:40 +0000436 memset(msrfilename, 0, sizeof(msrfilename));
437 snprintf(msrfilename, sizeof(msrfilename), "/dev/cpu%d", cpu);
Stefan Reinauer173e3ea2009-08-19 10:46:23 +0000438
439 if (fd_msr != -1) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000440 msg_pinfo("MSR was already initialized\n");
Stefan Reinauer173e3ea2009-08-19 10:46:23 +0000441 return -1;
442 }
443
444 fd_msr = open(msrfilename, O_RDWR);
445
446 if (fd_msr < 0) {
447 perror("Error while opening /dev/cpu0");
Sean Nelson316a29f2010-05-07 20:09:04 +0000448 msg_pinfo("Did you install ports/sysutils/devcpu?\n");
Stefan Reinauer173e3ea2009-08-19 10:46:23 +0000449 return -1;
450 }
451
452 return 0;
453}
454
455void cleanup_cpu_msr(void)
456{
457 if (fd_msr == -1) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000458 msg_pinfo("No MSR initialized.\n");
Stefan Reinauer173e3ea2009-08-19 10:46:23 +0000459 return;
460 }
461
462 close(fd_msr);
463
Uwe Hermann91f4afa2011-07-28 08:13:25 +0000464 /* Clear MSR file descriptor. */
Stefan Reinauer173e3ea2009-08-19 10:46:23 +0000465 fd_msr = -1;
466}
467
468#else
469
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000470#ifdef __DARWIN__
471int setup_cpu_msr(int cpu)
472{
473 // Always succeed for now
474 return 0;
475}
476
477void cleanup_cpu_msr(void)
478{
479 // Nothing, yet.
480}
Patrick Georgia9095a92010-09-30 17:03:32 +0000481#elif defined(__LIBPAYLOAD__)
482msr_t libpayload_rdmsr(int addr)
483{
484 msr_t msr;
485 unsigned long long val = _rdmsr(addr);
486 msr.lo = val & 0xffffffff;
487 msr.hi = val >> 32;
488 return msr;
489}
490
491int libpayload_wrmsr(int addr, msr_t msr)
492{
493 _wrmsr(addr, msr.lo | ((unsigned long long)msr.hi << 32));
Patrick Georgi97bc95c2011-03-08 07:17:44 +0000494 return 0;
Patrick Georgia9095a92010-09-30 17:03:32 +0000495}
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000496#else
497msr_t rdmsr(int addr)
498{
499 msr_t ret = { 0xffffffff, 0xffffffff };
500
501 return ret;
502}
503
504int wrmsr(int addr, msr_t msr)
505{
506 return -1;
507}
508
509int setup_cpu_msr(int cpu)
510{
Sean Nelson316a29f2010-05-07 20:09:04 +0000511 msg_pinfo("No MSR support for your OS yet.\n");
Stefan Reinauer8fa64812009-08-12 09:27:45 +0000512 return -1;
513}
514
515void cleanup_cpu_msr(void)
516{
517 // Nothing, yet.
518}
519#endif
520#endif
Stefan Reinauer173e3ea2009-08-19 10:46:23 +0000521#endif
Carl-Daniel Hailfingercceafa22010-05-26 01:45:41 +0000522#else
523/* Does MSR exist on non-x86 architectures? */
524#endif