xen-vtx-unstable

view xen/arch/x86/microcode.c @ 6759:b5d91089e42c

Newer binutils is a bit stricter and errors out when you try
to use movl on a 16 bit word on x86_64. Using just a "mov"
compiles fine and should result in the same code.

{standard input}: Assembler messages:
{standard input}:2138: Error: suffix or operands invalid for `mov'
{standard input}:2140: Error: suffix or operands invalid for `mov'
{standard input}:2142: Error: suffix or operands invalid for `mov'
{standard input}:2144: Error: suffix or operands invalid for `mov'

Signed-off-by: Rik van Riel <riel@redhat.com>
author kaf24@firebug.cl.cam.ac.uk
date Tue Sep 13 10:21:22 2005 +0000 (2005-09-13)
parents b51e4b4608f9
children
line source
1 /*
2 * Intel CPU Microcode Update Driver for Linux
3 *
4 * Copyright (C) 2000-2004 Tigran Aivazian
5 *
6 * This driver allows to upgrade microcode on Intel processors
7 * belonging to IA-32 family - PentiumPro, Pentium II,
8 * Pentium III, Xeon, Pentium 4, etc.
9 *
10 * Reference: Section 8.10 of Volume III, Intel Pentium 4 Manual,
11 * Order Number 245472 or free download from:
12 *
13 * http://developer.intel.com/design/pentium4/manuals/245472.htm
14 *
15 * For more information, go to http://www.urbanmyth.org/microcode
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 *
22 * 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com>
23 * Initial release.
24 * 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com>
25 * Added read() support + cleanups.
26 * 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com>
27 * Added 'device trimming' support. open(O_WRONLY) zeroes
28 * and frees the saved copy of applied microcode.
29 * 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com>
30 * Made to use devfs (/dev/cpu/microcode) + cleanups.
31 * 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com>
32 * Added misc device support (now uses both devfs and misc).
33 * Added MICROCODE_IOCFREE ioctl to clear memory.
34 * 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com>
35 * Messages for error cases (non Intel & no suitable microcode).
36 * 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com>
37 * Removed ->release(). Removed exclusive open and status bitmap.
38 * Added microcode_rwsem to serialize read()/write()/ioctl().
39 * Removed global kernel lock usage.
40 * 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com>
41 * Write 0 to 0x8B msr and then cpuid before reading revision,
42 * so that it works even if there were no update done by the
43 * BIOS. Otherwise, reading from 0x8B gives junk (which happened
44 * to be 0 on my machine which is why it worked even when I
45 * disabled update by the BIOS)
46 * Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix.
47 * 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and
48 * Tigran Aivazian <tigran@veritas.com>
49 * Intel Pentium 4 processor support and bugfixes.
50 * 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com>
51 * Bugfix for HT (Hyper-Threading) enabled processors
52 * whereby processor resources are shared by all logical processors
53 * in a single CPU package.
54 * 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and
55 * Tigran Aivazian <tigran@veritas.com>,
56 * Serialize updates as required on HT processors due to speculative
57 * nature of implementation.
58 * 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com>
59 * Fix the panic when writing zero-length microcode chunk.
60 * 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>,
61 * Jun Nakajima <jun.nakajima@intel.com>
62 * Support for the microcode updates in the new format.
63 * 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com>
64 * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl
65 * because we no longer hold a copy of applied microcode
66 * in kernel memory.
67 * 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com>
68 * Fix sigmatch() macro to handle old CPUs with pf == 0.
69 * Thanks to Stuart Swales for pointing out this bug.
70 */
72 #include <xen/config.h>
73 #include <xen/lib.h>
74 #include <xen/kernel.h>
75 #include <xen/init.h>
76 #include <xen/sched.h>
77 #include <xen/smp.h>
78 #include <xen/spinlock.h>
80 #include <asm/current.h>
81 #include <asm/msr.h>
82 #include <asm/uaccess.h>
83 #include <asm/processor.h>
85 #define pr_debug(x...) ((void)0)
86 #define DECLARE_MUTEX(_m) spinlock_t _m = SPIN_LOCK_UNLOCKED
87 #define down(_m) spin_lock(_m)
88 #define up(_m) spin_unlock(_m)
89 #define vmalloc(_s) xmalloc_bytes(_s)
90 #define vfree(_p) xfree(_p)
92 #if 0
93 MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver");
94 MODULE_AUTHOR("Tigran Aivazian <tigran@veritas.com>");
95 MODULE_LICENSE("GPL");
96 #endif
98 #define MICROCODE_VERSION "1.14"
100 #define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */
101 #define MC_HEADER_SIZE (sizeof (microcode_header_t)) /* 48 bytes */
102 #define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
103 #define EXT_HEADER_SIZE (sizeof (struct extended_sigtable)) /* 20 bytes */
104 #define EXT_SIGNATURE_SIZE (sizeof (struct extended_signature)) /* 12 bytes */
105 #define DWSIZE (sizeof (u32))
106 #define get_totalsize(mc) \
107 (((microcode_t *)mc)->hdr.totalsize ? \
108 ((microcode_t *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
109 #define get_datasize(mc) \
110 (((microcode_t *)mc)->hdr.datasize ? \
111 ((microcode_t *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
113 #define sigmatch(s1, s2, p1, p2) \
114 (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
116 #define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
118 /* serialize access to the physical write to MSR 0x79 */
119 static spinlock_t microcode_update_lock = SPIN_LOCK_UNLOCKED;
121 /* no concurrent ->write()s are allowed on /dev/cpu/microcode */
122 static DECLARE_MUTEX(microcode_sem);
124 static void __user *user_buffer; /* user area microcode data buffer */
125 static unsigned int user_buffer_size; /* it's size */
127 typedef enum mc_error_code {
128 MC_SUCCESS = 0,
129 MC_NOTFOUND = 1,
130 MC_MARKED = 2,
131 MC_ALLOCATED = 3,
132 } mc_error_code_t;
134 static struct ucode_cpu_info {
135 unsigned int sig;
136 unsigned int pf;
137 unsigned int rev;
138 unsigned int cksum;
139 mc_error_code_t err;
140 microcode_t *mc;
141 } ucode_cpu_info[NR_CPUS];
143 static void collect_cpu_info (void *unused)
144 {
145 int cpu_num = smp_processor_id();
146 struct cpuinfo_x86 *c = cpu_data + cpu_num;
147 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
148 unsigned int val[2];
150 uci->sig = uci->pf = uci->rev = uci->cksum = 0;
151 uci->err = MC_NOTFOUND;
152 uci->mc = NULL;
154 if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
155 cpu_has(c, X86_FEATURE_IA64)) {
156 printk(KERN_ERR "microcode: CPU%d not a capable Intel processor\n", cpu_num);
157 return;
158 } else {
159 uci->sig = cpuid_eax(0x00000001);
161 if ((c->x86_model >= 5) || (c->x86 > 6)) {
162 /* get processor flags from MSR 0x17 */
163 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
164 uci->pf = 1 << ((val[1] >> 18) & 7);
165 }
166 }
168 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
169 __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
170 /* get the current revision from MSR 0x8B */
171 rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
172 pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
173 uci->sig, uci->pf, uci->rev);
174 }
176 static inline void mark_microcode_update (int cpu_num, microcode_header_t *mc_header, int sig, int pf, int cksum)
177 {
178 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
180 pr_debug("Microcode Found.\n");
181 pr_debug(" Header Revision 0x%x\n", mc_header->hdrver);
182 pr_debug(" Loader Revision 0x%x\n", mc_header->ldrver);
183 pr_debug(" Revision 0x%x \n", mc_header->rev);
184 pr_debug(" Date %x/%x/%x\n",
185 ((mc_header->date >> 24 ) & 0xff),
186 ((mc_header->date >> 16 ) & 0xff),
187 (mc_header->date & 0xFFFF));
188 pr_debug(" Signature 0x%x\n", sig);
189 pr_debug(" Type 0x%x Family 0x%x Model 0x%x Stepping 0x%x\n",
190 ((sig >> 12) & 0x3),
191 ((sig >> 8) & 0xf),
192 ((sig >> 4) & 0xf),
193 ((sig & 0xf)));
194 pr_debug(" Processor Flags 0x%x\n", pf);
195 pr_debug(" Checksum 0x%x\n", cksum);
197 if (mc_header->rev < uci->rev) {
198 printk(KERN_ERR "microcode: CPU%d not 'upgrading' to earlier revision"
199 " 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
200 goto out;
201 } else if (mc_header->rev == uci->rev) {
202 /* notify the caller of success on this cpu */
203 uci->err = MC_SUCCESS;
204 printk(KERN_ERR "microcode: CPU%d already at revision"
205 " 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
206 goto out;
207 }
209 pr_debug("microcode: CPU%d found a matching microcode update with "
210 " revision 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
211 uci->cksum = cksum;
212 uci->pf = pf; /* keep the original mc pf for cksum calculation */
213 uci->err = MC_MARKED; /* found the match */
214 out:
215 return;
216 }
218 static int find_matching_ucodes (void)
219 {
220 int cursor = 0;
221 int error = 0;
223 while (cursor + MC_HEADER_SIZE < user_buffer_size) {
224 microcode_header_t mc_header;
225 void *newmc = NULL;
226 int i, sum, cpu_num, allocated_flag, total_size, data_size, ext_table_size;
228 if (copy_from_user(&mc_header, user_buffer + cursor, MC_HEADER_SIZE)) {
229 printk(KERN_ERR "microcode: error! Can not read user data\n");
230 error = -EFAULT;
231 goto out;
232 }
234 total_size = get_totalsize(&mc_header);
235 if ((cursor + total_size > user_buffer_size) || (total_size < DEFAULT_UCODE_TOTALSIZE)) {
236 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
237 error = -EINVAL;
238 goto out;
239 }
241 data_size = get_datasize(&mc_header);
242 if ((data_size + MC_HEADER_SIZE > total_size) || (data_size < DEFAULT_UCODE_DATASIZE)) {
243 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
244 error = -EINVAL;
245 goto out;
246 }
248 if (mc_header.ldrver != 1 || mc_header.hdrver != 1) {
249 printk(KERN_ERR "microcode: error! Unknown microcode update format\n");
250 error = -EINVAL;
251 goto out;
252 }
254 for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
255 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
256 if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
257 continue;
259 if (sigmatch(mc_header.sig, uci->sig, mc_header.pf, uci->pf))
260 mark_microcode_update(cpu_num, &mc_header, mc_header.sig, mc_header.pf, mc_header.cksum);
261 }
263 ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
264 if (ext_table_size) {
265 struct extended_sigtable ext_header;
266 struct extended_signature ext_sig;
267 int ext_sigcount;
269 if ((ext_table_size < EXT_HEADER_SIZE)
270 || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
271 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
272 error = -EINVAL;
273 goto out;
274 }
275 if (copy_from_user(&ext_header, user_buffer + cursor
276 + MC_HEADER_SIZE + data_size, EXT_HEADER_SIZE)) {
277 printk(KERN_ERR "microcode: error! Can not read user data\n");
278 error = -EFAULT;
279 goto out;
280 }
281 if (ext_table_size != exttable_size(&ext_header)) {
282 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
283 error = -EFAULT;
284 goto out;
285 }
287 ext_sigcount = ext_header.count;
289 for (i = 0; i < ext_sigcount; i++) {
290 if (copy_from_user(&ext_sig, user_buffer + cursor + MC_HEADER_SIZE + data_size + EXT_HEADER_SIZE
291 + EXT_SIGNATURE_SIZE * i, EXT_SIGNATURE_SIZE)) {
292 printk(KERN_ERR "microcode: error! Can not read user data\n");
293 error = -EFAULT;
294 goto out;
295 }
296 for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
297 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
298 if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
299 continue;
300 if (sigmatch(ext_sig.sig, uci->sig, ext_sig.pf, uci->pf)) {
301 mark_microcode_update(cpu_num, &mc_header, ext_sig.sig, ext_sig.pf, ext_sig.cksum);
302 }
303 }
304 }
305 }
306 /* now check if any cpu has matched */
307 for (cpu_num = 0, allocated_flag = 0, sum = 0; cpu_num < num_online_cpus(); cpu_num++) {
308 if (ucode_cpu_info[cpu_num].err == MC_MARKED) {
309 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
310 if (!allocated_flag) {
311 allocated_flag = 1;
312 newmc = vmalloc(total_size);
313 if (!newmc) {
314 printk(KERN_ERR "microcode: error! Can not allocate memory\n");
315 error = -ENOMEM;
316 goto out;
317 }
318 if (copy_from_user(newmc + MC_HEADER_SIZE,
319 user_buffer + cursor + MC_HEADER_SIZE,
320 total_size - MC_HEADER_SIZE)) {
321 printk(KERN_ERR "microcode: error! Can not read user data\n");
322 vfree(newmc);
323 error = -EFAULT;
324 goto out;
325 }
326 memcpy(newmc, &mc_header, MC_HEADER_SIZE);
327 /* check extended table checksum */
328 if (ext_table_size) {
329 int ext_table_sum = 0;
330 int * ext_tablep = (((void *) newmc) + MC_HEADER_SIZE + data_size);
331 i = ext_table_size / DWSIZE;
332 while (i--) ext_table_sum += ext_tablep[i];
333 if (ext_table_sum) {
334 printk(KERN_WARNING "microcode: aborting, bad extended signature table checksum\n");
335 vfree(newmc);
336 error = -EINVAL;
337 goto out;
338 }
339 }
341 /* calculate the checksum */
342 i = (MC_HEADER_SIZE + data_size) / DWSIZE;
343 while (i--) sum += ((int *)newmc)[i];
344 sum -= (mc_header.sig + mc_header.pf + mc_header.cksum);
345 }
346 ucode_cpu_info[cpu_num].mc = newmc;
347 ucode_cpu_info[cpu_num].err = MC_ALLOCATED; /* mc updated */
348 if (sum + uci->sig + uci->pf + uci->cksum != 0) {
349 printk(KERN_ERR "microcode: CPU%d aborting, bad checksum\n", cpu_num);
350 error = -EINVAL;
351 goto out;
352 }
353 }
354 }
355 cursor += total_size; /* goto the next update patch */
356 } /* end of while */
357 out:
358 return error;
359 }
361 static void do_update_one (void * unused)
362 {
363 unsigned long flags;
364 unsigned int val[2];
365 int cpu_num = smp_processor_id();
366 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
368 if (uci->mc == NULL) {
369 printk(KERN_INFO "microcode: No suitable data for CPU%d\n", cpu_num);
370 return;
371 }
373 /* serialize access to the physical write to MSR 0x79 */
374 spin_lock_irqsave(&microcode_update_lock, flags);
376 /* write microcode via MSR 0x79 */
377 wrmsr(MSR_IA32_UCODE_WRITE,
378 (unsigned long) uci->mc->bits,
379 (unsigned long) uci->mc->bits >> 16 >> 16);
380 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
382 __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
383 /* get the current revision from MSR 0x8B */
384 rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
386 /* notify the caller of success on this cpu */
387 uci->err = MC_SUCCESS;
388 spin_unlock_irqrestore(&microcode_update_lock, flags);
389 printk(KERN_INFO "microcode: CPU%d updated from revision "
390 "0x%x to 0x%x, date = %08x \n",
391 cpu_num, uci->rev, val[1], uci->mc->hdr.date);
392 return;
393 }
395 static int do_microcode_update (void)
396 {
397 int i, error;
399 if (on_each_cpu(collect_cpu_info, NULL, 1, 1) != 0) {
400 printk(KERN_ERR "microcode: Error! Could not run on all processors\n");
401 error = -EIO;
402 goto out;
403 }
405 if ((error = find_matching_ucodes())) {
406 printk(KERN_ERR "microcode: Error in the microcode data\n");
407 goto out_free;
408 }
410 if (on_each_cpu(do_update_one, NULL, 1, 1) != 0) {
411 printk(KERN_ERR "microcode: Error! Could not run on all processors\n");
412 error = -EIO;
413 }
415 out_free:
416 for (i = 0; i < num_online_cpus(); i++) {
417 if (ucode_cpu_info[i].mc) {
418 int j;
419 void *tmp = ucode_cpu_info[i].mc;
420 vfree(tmp);
421 for (j = i; j < num_online_cpus(); j++) {
422 if (ucode_cpu_info[j].mc == tmp)
423 ucode_cpu_info[j].mc = NULL;
424 }
425 }
426 }
427 out:
428 return error;
429 }
431 int microcode_update(void *buf, unsigned long len)
432 {
433 int ret;
435 if (len < DEFAULT_UCODE_TOTALSIZE) {
436 printk(KERN_ERR "microcode: not enough data\n");
437 return -EINVAL;
438 }
440 down(&microcode_sem);
442 user_buffer = (void __user *) buf;
443 user_buffer_size = (int) len;
445 ret = do_microcode_update();
447 up(&microcode_sem);
449 return ret;
450 }