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1/*␊
2 * This file is part of the flashrom project.␊
3 *␊
4 * Copyright (C) 2009 Peter Stuge <peter@stuge.se>␊
5 * Copyright (C) 2009 coresystems GmbH␊
6 * Copyright (C) 2010 Carl-Daniel Hailfinger␊
7 * Copyright (C) 2010 Rudolf Marek <r.marek@assembler.cz>␊
8 *␊
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 */␊
22␊
23#include <unistd.h>␊
24#include <stdio.h>␊
25#include <stdlib.h>␊
26#include <string.h>␊
27#include "flash.h"␊
28␊
29/* Do we need any file access or ioctl for physmap or MSR? */␊
30#if !defined(__DJGPP__) && !defined(__LIBPAYLOAD__)␊
31#include <sys/stat.h>␊
32#include <fcntl.h>␊
33#include <errno.h>␊
34#endif␊
35␊
36#ifdef __DJGPP__␊
37#include <dpmi.h>␊
38#include <sys/nearptr.h>␊
39␊
40#define MEM_DEV "dpmi"␊
41␊
42static void *realmem_map;␊
43␊
44static void *map_first_meg(unsigned long phys_addr, size_t len)␊
45{␊
46␉if (realmem_map)␊
47␉␉return realmem_map + phys_addr;␊
48␊
49␉realmem_map = valloc(1024 * 1024);␊
50␊
51␉if (!realmem_map)␊
52␉␉return ERROR_PTR;␊
53␊
54␉if (__djgpp_map_physical_memory(realmem_map, (1024 * 1024), 0)) {␊
55␉␉free(realmem_map);␊
56␉␉realmem_map = NULL;␊
57␉␉return ERROR_PTR;␊
58␉}␊
59␊
60␉return realmem_map + phys_addr;␊
61}␊
62␊
63static void *sys_physmap(unsigned long phys_addr, size_t len)␊
64{␊
65␉int ret;␊
66␉__dpmi_meminfo mi;␊
67␊
68␉/* Enable 4GB limit on DS descriptor. */␊
69␉if (!__djgpp_nearptr_enable())␊
70␉␉return ERROR_PTR;␊
71␊
72␉if ((phys_addr + len - 1) < (1024 * 1024)) {␊
73␉␉/* We need to use another method to map first 1MB. */␊
74␉␉return map_first_meg(phys_addr, len);␊
75␉}␊
76␊
77␉mi.address = phys_addr;␊
78␉mi.size = len;␊
79␉ret = __dpmi_physical_address_mapping(&mi);␊
80␊
81␉if (ret != 0)␊
82␉␉return ERROR_PTR;␊
83␊
84␉return (void *) mi.address + __djgpp_conventional_base;␊
85}␊
86␊
87#define sys_physmap_rw_uncached␉sys_physmap␊
88#define sys_physmap_ro_cached␉sys_physmap␊
89␊
90void physunmap(void *virt_addr, size_t len)␊
91{␊
92␉__dpmi_meminfo mi;␊
93␊
94␉/* There is no known way to unmap the first 1 MB. The DPMI server will␊
95␉ * do this for us on exit.␊
96␉ */␊
97␉if ((virt_addr >= realmem_map) &&␊
98␉ ((virt_addr + len) <= (realmem_map + (1024 * 1024)))) {␊
99␉␉return;␊
100␉}␊
101␊
102␉mi.address = (unsigned long) virt_addr;␊
103␉__dpmi_free_physical_address_mapping(&mi);␊
104}␊
105␊
106#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{␊
113␉return (void *)phys_to_virt(phys_addr);␊
114}␊
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}␊
131#elif defined(__DARWIN__)␊
132␊
133#define MEM_DEV "DirectHW"␊
134␊
135static void *sys_physmap(unsigned long phys_addr, size_t len)␊
136{␊
137␉/* 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;␊
143}␊
144␊
145/* 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␊
149void physunmap(void *virt_addr, size_t len)␊
150{␊
151␉unmap_physical(virt_addr, len);␊
152}␊
153␊
154#else␊
155#include <sys/mman.h>␊
156␊
157#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;␊
164static int fd_mem_cached = -1;␊
165␊
166/* For MMIO access. Must be uncached, doesn't make sense to restrict to ro. */␊
167static void *sys_physmap_rw_uncached(unsigned long phys_addr, size_t len)␊
168{␊
169␉void *virt_addr;␊
170␊
171␉if (-1 == fd_mem) {␊
172␉␉/* Open the memory device UNCACHED. Important for MMIO. */␊
173␉␉if (-1 == (fd_mem = open(MEM_DEV, O_RDWR | O_SYNC))) {␊
174␉␉␉perror("Critical error: open(" MEM_DEV ")");␊
175␉␉␉exit(2);␊
176␉␉}␊
177␉}␊
178␊
179␉virt_addr = mmap(NULL, len, PROT_WRITE | PROT_READ, MAP_SHARED,␊
180␉␉␉ fd_mem, (off_t)phys_addr);␊
181␉return MAP_FAILED == virt_addr ? ERROR_PTR : virt_addr;␊
182}␊
183␊
184/* For reading DMI/coreboot/whatever tables. We should never write, and we␊
185 * do not care about caching.␊
186 */␊
187static void *sys_physmap_ro_cached(unsigned long phys_addr, size_t len)␊
188{␊
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))) {␊
194␉␉␉msg_perr("Critical error: open(" MEM_DEV "): %s",␊
195␉␉␉␉ strerror(errno));␊
196␉␉␉exit(2);␊
197␉␉}␊
198␉}␊
199␊
200␉virt_addr = mmap(NULL, len, PROT_READ, MAP_SHARED,␊
201␉␉␉ fd_mem_cached, (off_t)phys_addr);␊
202␉return MAP_FAILED == virt_addr ? ERROR_PTR : virt_addr;␊
203}␊
204␊
205void physunmap(void *virt_addr, size_t len)␊
206{␊
207␉if (len == 0) {␊
208␉␉msg_pspew("Not unmapping zero size at %p\n", virt_addr);␊
209␉␉return;␊
210␉}␊
211␉␉␊
212␉munmap(virt_addr, len);␊
213}␊
214#endif␊
215␊
216#define PHYSMAP_NOFAIL␉0␊
217#define PHYSMAP_MAYFAIL␉1␊
218#define PHYSMAP_RW␉0␊
219#define PHYSMAP_RO␉1␊
220␊
221static void *physmap_common(const char *descr, unsigned long phys_addr,␊
222␉␉␉ size_t len, int mayfail, int readonly)␊
223{␊
224␉void *virt_addr;␊
225␊
226␉if (len == 0) {␊
227␉␉msg_pspew("Not mapping %s, zero size at 0x%08lx.\n",␊
228␉␉␉ descr, phys_addr);␊
229␉␉return ERROR_PTR;␊
230␉}␊
231␊
232␉if ((getpagesize() - 1) & len) {␊
233␉␉msg_perr("Mapping %s at 0x%08lx, unaligned size 0x%lx.\n",␊
234␉␉␉ descr, phys_addr, (unsigned long)len);␊
235␉}␊
236␊
237␉if ((getpagesize() - 1) & phys_addr) {␊
238␉␉msg_perr("Mapping %s, 0x%lx bytes at unaligned 0x%08lx.\n",␊
239␉␉␉ descr, (unsigned long)len, phys_addr);␊
240␉}␊
241␊
242␉if (readonly)␊
243␉␉virt_addr = sys_physmap_ro_cached(phys_addr, len);␊
244␉else␊
245␉␉virt_addr = sys_physmap_rw_uncached(phys_addr, len);␊
246␊
247␉if (ERROR_PTR == virt_addr) {␊
248␉␉if (NULL == descr)␊
249␉␉␉descr = "memory";␊
250␉␉msg_perr("Error accessing %s, 0x%lx bytes at 0x%08lx\n", descr,␊
251␉␉␉ (unsigned long)len, phys_addr);␊
252␉␉perror(MEM_DEV " mmap failed");␊
253#ifdef __linux__␊
254␉␉if (EINVAL == errno) {␊
255␉␉␉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");␊
260␉␉}␊
261#elif defined (__OpenBSD__)␊
262␉␉msg_perr("Please set securelevel=-1 in /etc/rc.securelevel "␊
263␉␉␉ "and reboot, or reboot into\n"␊
264␉␉␉ "single user mode.\n");␊
265#endif␊
266␉␉if (!mayfail)␊
267␉␉␉exit(3);␊
268␉}␊
269␊
270␉return virt_addr;␊
271}␊
272␊
273void *physmap(const char *descr, unsigned long phys_addr, size_t len)␊
274{␊
275␉return physmap_common(descr, phys_addr, len, PHYSMAP_NOFAIL,␊
276␉␉␉ PHYSMAP_RW);␊
277}␊
278␊
279void *physmap_try_ro(const char *descr, unsigned long phys_addr, size_t len)␊
280{␊
281␉return physmap_common(descr, phys_addr, len, PHYSMAP_MAYFAIL,␊
282␉␉␉ PHYSMAP_RO);␊
283}␊
284␊
285#if defined(__i386__) || defined(__x86_64__)␊
286␊
287#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␊
291 * read/write. This function, therefore, requires that the msr kernel module␊
292 * 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{␊
300␉uint32_t buf[2];␊
301␉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) {␊
310␉␉msr.lo = buf[0];␊
311␉␉msr.hi = buf[1];␊
312␉␉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{␊
327␉uint32_t buf[2];␊
328␉buf[0] = msr.lo;␊
329␉buf[1] = msr.hi;␊
330␊
331␉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␊
337␉if (write(fd_msr, buf, 8) != 8 && errno != EIO) {␊
338␉␉perror("Could not write() MSR");␊
339␉␉close(fd_msr);␊
340␉␉exit(1);␊
341␉}␊
342␊
343␉/* Some MSRs must not be written. */␊
344␉if (errno == EIO)␊
345␉␉return -1;␊
346␊
347␉return 0;␊
348}␊
349␊
350int setup_cpu_msr(int cpu)␊
351{␊
352␉char msrfilename[64];␊
353␉memset(msrfilename, 0, sizeof(msrfilename));␊
354␉snprintf(msrfilename, sizeof(msrfilename), "/dev/cpu/%d/msr", cpu);␊
355␊
356␉if (fd_msr != -1) {␊
357␉␉msg_pinfo("MSR was already initialized\n");␊
358␉␉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");␊
365␉␉msg_pinfo("Did you run 'modprobe msr'?\n");␊
366␉␉return -1;␊
367␉}␊
368␊
369␉return 0;␊
370}␊
371␊
372void cleanup_cpu_msr(void)␊
373{␊
374␉if (fd_msr == -1) {␊
375␉␉msg_pinfo("No MSR initialized.\n");␊
376␉␉return;␊
377␉}␊
378␊
379␉close(fd_msr);␊
380␊
381␉/* Clear MSR file descriptor. */␊
382␉fd_msr = -1;␊
383}␊
384#else␊
385#if defined(__FreeBSD__) || defined(__DragonFly__)␊
386#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];␊
436␉memset(msrfilename, 0, sizeof(msrfilename));␊
437␉snprintf(msrfilename, sizeof(msrfilename), "/dev/cpu%d", cpu);␊
438␊
439␉if (fd_msr != -1) {␊
440␉␉msg_pinfo("MSR was already initialized\n");␊
441␉␉return -1;␊
442␉}␊
443␊
444␉fd_msr = open(msrfilename, O_RDWR);␊
445␊
446␉if (fd_msr < 0) {␊
447␉␉perror("Error while opening /dev/cpu0");␊
448␉␉msg_pinfo("Did you install ports/sysutils/devcpu?\n");␊
449␉␉return -1;␊
450␉}␊
451␊
452␉return 0;␊
453}␊
454␊
455void cleanup_cpu_msr(void)␊
456{␊
457␉if (fd_msr == -1) {␊
458␉␉msg_pinfo("No MSR initialized.\n");␊
459␉␉return;␊
460␉}␊
461␊
462␉close(fd_msr);␊
463␊
464␉/* Clear MSR file descriptor. */␊
465␉fd_msr = -1;␊
466}␊
467␊
468#else␊
469␊
470#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}␊
481#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));␊
494␉return 0;␊
495}␊
496#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{␊
511␉msg_pinfo("No MSR support for your OS yet.\n");␊
512␉return -1;␊
513}␊
514␊
515void cleanup_cpu_msr(void)␊
516{␊
517␉// Nothing, yet.␊
518}␊
519#endif␊
520#endif␊
521#endif␊
522#else␊
523/* Does MSR exist on non-x86 architectures? */␊
524#endif␊
525

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