debuggers.hg

annotate xen/arch/x86/microcode.c @ 3658:0ef6e8e6e85d

find changesets by author, revision, files, or words in the commit message
bitkeeper revision 1.1159.212.71 (4200f0afX_JumfbEHQex6TdFENULMQ)

Merge labyrinth.cl.cam.ac.uk:/auto/groups/xeno-xenod/BK/xen-unstable.bk
into labyrinth.cl.cam.ac.uk:/auto/groups/xeno/users/iap10/xeno-clone/xen-unstable.bk
author iap10@labyrinth.cl.cam.ac.uk
date Wed Feb 02 15:24:31 2005 +0000 (2005-02-02)
parents 524b831d8294 10a0f6b0a996
children 8472fafee3cf
rev   line source
kaf24@3400 1 /*
kaf24@3400 2 * Intel CPU Microcode Update Driver for Linux
kaf24@3400 3 *
kaf24@3400 4 * Copyright (C) 2000-2004 Tigran Aivazian
kaf24@3400 5 *
kaf24@3400 6 * This driver allows to upgrade microcode on Intel processors
kaf24@3400 7 * belonging to IA-32 family - PentiumPro, Pentium II,
kaf24@3400 8 * Pentium III, Xeon, Pentium 4, etc.
kaf24@3400 9 *
kaf24@3400 10 * Reference: Section 8.10 of Volume III, Intel Pentium 4 Manual,
kaf24@3400 11 * Order Number 245472 or free download from:
kaf24@3400 12 *
kaf24@3400 13 * http://developer.intel.com/design/pentium4/manuals/245472.htm
kaf24@3400 14 *
kaf24@3400 15 * For more information, go to http://www.urbanmyth.org/microcode
kaf24@3400 16 *
kaf24@3400 17 * This program is free software; you can redistribute it and/or
kaf24@3400 18 * modify it under the terms of the GNU General Public License
kaf24@3400 19 * as published by the Free Software Foundation; either version
kaf24@3400 20 * 2 of the License, or (at your option) any later version.
kaf24@3400 21 *
kaf24@3400 22 * 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com>
kaf24@3400 23 * Initial release.
kaf24@3400 24 * 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com>
kaf24@3400 25 * Added read() support + cleanups.
kaf24@3400 26 * 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com>
kaf24@3400 27 * Added 'device trimming' support. open(O_WRONLY) zeroes
kaf24@3400 28 * and frees the saved copy of applied microcode.
kaf24@3400 29 * 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com>
kaf24@3400 30 * Made to use devfs (/dev/cpu/microcode) + cleanups.
kaf24@3400 31 * 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com>
kaf24@3400 32 * Added misc device support (now uses both devfs and misc).
kaf24@3400 33 * Added MICROCODE_IOCFREE ioctl to clear memory.
kaf24@3400 34 * 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com>
kaf24@3400 35 * Messages for error cases (non Intel & no suitable microcode).
kaf24@3400 36 * 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com>
kaf24@3400 37 * Removed ->release(). Removed exclusive open and status bitmap.
kaf24@3400 38 * Added microcode_rwsem to serialize read()/write()/ioctl().
kaf24@3400 39 * Removed global kernel lock usage.
kaf24@3400 40 * 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com>
kaf24@3400 41 * Write 0 to 0x8B msr and then cpuid before reading revision,
kaf24@3400 42 * so that it works even if there were no update done by the
kaf24@3400 43 * BIOS. Otherwise, reading from 0x8B gives junk (which happened
kaf24@3400 44 * to be 0 on my machine which is why it worked even when I
kaf24@3400 45 * disabled update by the BIOS)
kaf24@3400 46 * Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix.
kaf24@3400 47 * 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and
kaf24@3400 48 * Tigran Aivazian <tigran@veritas.com>
kaf24@3400 49 * Intel Pentium 4 processor support and bugfixes.
kaf24@3400 50 * 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com>
kaf24@3400 51 * Bugfix for HT (Hyper-Threading) enabled processors
kaf24@3400 52 * whereby processor resources are shared by all logical processors
kaf24@3400 53 * in a single CPU package.
kaf24@3400 54 * 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and
kaf24@3400 55 * Tigran Aivazian <tigran@veritas.com>,
kaf24@3400 56 * Serialize updates as required on HT processors due to speculative
kaf24@3400 57 * nature of implementation.
kaf24@3400 58 * 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com>
kaf24@3400 59 * Fix the panic when writing zero-length microcode chunk.
kaf24@3400 60 * 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>,
kaf24@3400 61 * Jun Nakajima <jun.nakajima@intel.com>
kaf24@3400 62 * Support for the microcode updates in the new format.
kaf24@3400 63 * 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com>
kaf24@3400 64 * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl
kaf24@3400 65 * because we no longer hold a copy of applied microcode
kaf24@3400 66 * in kernel memory.
kaf24@3400 67 * 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com>
kaf24@3400 68 * Fix sigmatch() macro to handle old CPUs with pf == 0.
kaf24@3400 69 * Thanks to Stuart Swales for pointing out this bug.
kaf24@3400 70 */
kaf24@3400 71
kaf24@3400 72 #include <xen/config.h>
kaf24@3400 73 #include <xen/kernel.h>
kaf24@3400 74 #include <xen/init.h>
kaf24@3400 75 #include <xen/sched.h>
kaf24@3400 76 #include <xen/slab.h>
kaf24@3400 77 #include <xen/spinlock.h>
kaf24@3400 78
kaf24@3400 79 #include <asm/msr.h>
kaf24@3400 80 #include <asm/uaccess.h>
kaf24@3400 81 #include <asm/processor.h>
kaf24@3400 82
kaf24@3400 83 #define pr_debug(x...) ((void)0)
kaf24@3400 84 #define DECLARE_MUTEX(_m) spinlock_t _m = SPIN_LOCK_UNLOCKED
kaf24@3400 85 #define down(_m) spin_lock(_m)
kaf24@3400 86 #define up(_m) spin_unlock(_m)
iap10@3652 87 #define vmalloc(_s) _xmalloc(_s)
kaf24@3400 88 #define vfree(_p) xfree(_p)
kaf24@3400 89 #define num_online_cpus() smp_num_cpus
kaf24@3400 90 static inline int on_each_cpu(
kaf24@3400 91 void (*func) (void *info), void *info, int retry, int wait)
kaf24@3400 92 {
kaf24@3400 93 int ret = smp_call_function(func, info, retry, wait);
kaf24@3400 94 func(info);
kaf24@3400 95 return ret;
kaf24@3400 96 }
kaf24@3400 97
kaf24@3400 98 #if 0
kaf24@3400 99 MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver");
kaf24@3400 100 MODULE_AUTHOR("Tigran Aivazian <tigran@veritas.com>");
kaf24@3400 101 MODULE_LICENSE("GPL");
kaf24@3400 102 #endif
kaf24@3400 103
kaf24@3400 104 #define MICROCODE_VERSION "1.14"
kaf24@3400 105
kaf24@3400 106 #define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */
kaf24@3400 107 #define MC_HEADER_SIZE (sizeof (microcode_header_t)) /* 48 bytes */
kaf24@3400 108 #define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
kaf24@3400 109 #define EXT_HEADER_SIZE (sizeof (struct extended_sigtable)) /* 20 bytes */
kaf24@3400 110 #define EXT_SIGNATURE_SIZE (sizeof (struct extended_signature)) /* 12 bytes */
kaf24@3400 111 #define DWSIZE (sizeof (u32))
kaf24@3400 112 #define get_totalsize(mc) \
kaf24@3400 113 (((microcode_t *)mc)->hdr.totalsize ? \
kaf24@3400 114 ((microcode_t *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
kaf24@3400 115 #define get_datasize(mc) \
kaf24@3400 116 (((microcode_t *)mc)->hdr.datasize ? \
kaf24@3400 117 ((microcode_t *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
kaf24@3400 118
kaf24@3400 119 #define sigmatch(s1, s2, p1, p2) \
kaf24@3400 120 (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
kaf24@3400 121
kaf24@3400 122 #define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
kaf24@3400 123
kaf24@3400 124 /* serialize access to the physical write to MSR 0x79 */
kaf24@3400 125 static spinlock_t microcode_update_lock = SPIN_LOCK_UNLOCKED;
kaf24@3400 126
kaf24@3400 127 /* no concurrent ->write()s are allowed on /dev/cpu/microcode */
kaf24@3400 128 static DECLARE_MUTEX(microcode_sem);
kaf24@3400 129
kaf24@3400 130 static void __user *user_buffer; /* user area microcode data buffer */
kaf24@3400 131 static unsigned int user_buffer_size; /* it's size */
kaf24@3400 132
kaf24@3400 133 typedef enum mc_error_code {
kaf24@3400 134 MC_SUCCESS = 0,
kaf24@3400 135 MC_NOTFOUND = 1,
kaf24@3400 136 MC_MARKED = 2,
kaf24@3400 137 MC_ALLOCATED = 3,
kaf24@3400 138 } mc_error_code_t;
kaf24@3400 139
kaf24@3400 140 static struct ucode_cpu_info {
kaf24@3400 141 unsigned int sig;
kaf24@3400 142 unsigned int pf;
kaf24@3400 143 unsigned int rev;
kaf24@3400 144 unsigned int cksum;
kaf24@3400 145 mc_error_code_t err;
kaf24@3400 146 microcode_t *mc;
kaf24@3400 147 } ucode_cpu_info[NR_CPUS];
kaf24@3400 148
kaf24@3400 149 static void collect_cpu_info (void *unused)
kaf24@3400 150 {
kaf24@3400 151 int cpu_num = smp_processor_id();
kaf24@3400 152 struct cpuinfo_x86 *c = cpu_data + cpu_num;
kaf24@3400 153 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
kaf24@3400 154 unsigned int val[2];
kaf24@3400 155
kaf24@3400 156 uci->sig = uci->pf = uci->rev = uci->cksum = 0;
kaf24@3400 157 uci->err = MC_NOTFOUND;
kaf24@3400 158 uci->mc = NULL;
kaf24@3400 159
kaf24@3400 160 if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
kaf24@3400 161 cpu_has(c, X86_FEATURE_IA64)) {
kaf24@3400 162 printk(KERN_ERR "microcode: CPU%d not a capable Intel processor\n", cpu_num);
kaf24@3400 163 return;
kaf24@3400 164 } else {
kaf24@3400 165 uci->sig = cpuid_eax(0x00000001);
kaf24@3400 166
kaf24@3400 167 if ((c->x86_model >= 5) || (c->x86 > 6)) {
kaf24@3400 168 /* get processor flags from MSR 0x17 */
kaf24@3400 169 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
kaf24@3400 170 uci->pf = 1 << ((val[1] >> 18) & 7);
kaf24@3400 171 }
kaf24@3400 172 }
kaf24@3400 173
kaf24@3400 174 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
kaf24@3400 175 __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
kaf24@3400 176 /* get the current revision from MSR 0x8B */
kaf24@3400 177 rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
kaf24@3400 178 pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
kaf24@3400 179 uci->sig, uci->pf, uci->rev);
kaf24@3400 180 }
kaf24@3400 181
kaf24@3400 182 static inline void mark_microcode_update (int cpu_num, microcode_header_t *mc_header, int sig, int pf, int cksum)
kaf24@3400 183 {
kaf24@3400 184 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
kaf24@3400 185
kaf24@3400 186 pr_debug("Microcode Found.\n");
kaf24@3400 187 pr_debug(" Header Revision 0x%x\n", mc_header->hdrver);
kaf24@3400 188 pr_debug(" Loader Revision 0x%x\n", mc_header->ldrver);
kaf24@3400 189 pr_debug(" Revision 0x%x \n", mc_header->rev);
kaf24@3400 190 pr_debug(" Date %x/%x/%x\n",
kaf24@3400 191 ((mc_header->date >> 24 ) & 0xff),
kaf24@3400 192 ((mc_header->date >> 16 ) & 0xff),
kaf24@3400 193 (mc_header->date & 0xFFFF));
kaf24@3400 194 pr_debug(" Signature 0x%x\n", sig);
kaf24@3400 195 pr_debug(" Type 0x%x Family 0x%x Model 0x%x Stepping 0x%x\n",
kaf24@3400 196 ((sig >> 12) & 0x3),
kaf24@3400 197 ((sig >> 8) & 0xf),
kaf24@3400 198 ((sig >> 4) & 0xf),
kaf24@3400 199 ((sig & 0xf)));
kaf24@3400 200 pr_debug(" Processor Flags 0x%x\n", pf);
kaf24@3400 201 pr_debug(" Checksum 0x%x\n", cksum);
kaf24@3400 202
kaf24@3400 203 if (mc_header->rev < uci->rev) {
kaf24@3400 204 printk(KERN_ERR "microcode: CPU%d not 'upgrading' to earlier revision"
kaf24@3400 205 " 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
kaf24@3400 206 goto out;
kaf24@3400 207 } else if (mc_header->rev == uci->rev) {
kaf24@3400 208 /* notify the caller of success on this cpu */
kaf24@3400 209 uci->err = MC_SUCCESS;
kaf24@3400 210 printk(KERN_ERR "microcode: CPU%d already at revision"
kaf24@3400 211 " 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
kaf24@3400 212 goto out;
kaf24@3400 213 }
kaf24@3400 214
kaf24@3400 215 pr_debug("microcode: CPU%d found a matching microcode update with "
kaf24@3400 216 " revision 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
kaf24@3400 217 uci->cksum = cksum;
kaf24@3400 218 uci->pf = pf; /* keep the original mc pf for cksum calculation */
kaf24@3400 219 uci->err = MC_MARKED; /* found the match */
kaf24@3400 220 out:
kaf24@3400 221 return;
kaf24@3400 222 }
kaf24@3400 223
kaf24@3400 224 static int find_matching_ucodes (void)
kaf24@3400 225 {
kaf24@3400 226 int cursor = 0;
kaf24@3400 227 int error = 0;
kaf24@3400 228
kaf24@3400 229 while (cursor + MC_HEADER_SIZE < user_buffer_size) {
kaf24@3400 230 microcode_header_t mc_header;
kaf24@3400 231 void *newmc = NULL;
kaf24@3400 232 int i, sum, cpu_num, allocated_flag, total_size, data_size, ext_table_size;
kaf24@3400 233
kaf24@3400 234 if (copy_from_user(&mc_header, user_buffer + cursor, MC_HEADER_SIZE)) {
kaf24@3400 235 printk(KERN_ERR "microcode: error! Can not read user data\n");
kaf24@3400 236 error = -EFAULT;
kaf24@3400 237 goto out;
kaf24@3400 238 }
kaf24@3400 239
kaf24@3400 240 total_size = get_totalsize(&mc_header);
kaf24@3400 241 if ((cursor + total_size > user_buffer_size) || (total_size < DEFAULT_UCODE_TOTALSIZE)) {
kaf24@3400 242 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
kaf24@3400 243 error = -EINVAL;
kaf24@3400 244 goto out;
kaf24@3400 245 }
kaf24@3400 246
kaf24@3400 247 data_size = get_datasize(&mc_header);
kaf24@3400 248 if ((data_size + MC_HEADER_SIZE > total_size) || (data_size < DEFAULT_UCODE_DATASIZE)) {
kaf24@3400 249 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
kaf24@3400 250 error = -EINVAL;
kaf24@3400 251 goto out;
kaf24@3400 252 }
kaf24@3400 253
kaf24@3400 254 if (mc_header.ldrver != 1 || mc_header.hdrver != 1) {
kaf24@3400 255 printk(KERN_ERR "microcode: error! Unknown microcode update format\n");
kaf24@3400 256 error = -EINVAL;
kaf24@3400 257 goto out;
kaf24@3400 258 }
kaf24@3400 259
kaf24@3400 260 for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
kaf24@3400 261 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
kaf24@3400 262 if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
kaf24@3400 263 continue;
kaf24@3400 264
kaf24@3400 265 if (sigmatch(mc_header.sig, uci->sig, mc_header.pf, uci->pf))
kaf24@3400 266 mark_microcode_update(cpu_num, &mc_header, mc_header.sig, mc_header.pf, mc_header.cksum);
kaf24@3400 267 }
kaf24@3400 268
kaf24@3400 269 ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
kaf24@3400 270 if (ext_table_size) {
kaf24@3400 271 struct extended_sigtable ext_header;
kaf24@3400 272 struct extended_signature ext_sig;
kaf24@3400 273 int ext_sigcount;
kaf24@3400 274
kaf24@3400 275 if ((ext_table_size < EXT_HEADER_SIZE)
kaf24@3400 276 || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
kaf24@3400 277 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
kaf24@3400 278 error = -EINVAL;
kaf24@3400 279 goto out;
kaf24@3400 280 }
kaf24@3400 281 if (copy_from_user(&ext_header, user_buffer + cursor
kaf24@3400 282 + MC_HEADER_SIZE + data_size, EXT_HEADER_SIZE)) {
kaf24@3400 283 printk(KERN_ERR "microcode: error! Can not read user data\n");
kaf24@3400 284 error = -EFAULT;
kaf24@3400 285 goto out;
kaf24@3400 286 }
kaf24@3400 287 if (ext_table_size != exttable_size(&ext_header)) {
kaf24@3400 288 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
kaf24@3400 289 error = -EFAULT;
kaf24@3400 290 goto out;
kaf24@3400 291 }
kaf24@3400 292
kaf24@3400 293 ext_sigcount = ext_header.count;
kaf24@3400 294
kaf24@3400 295 for (i = 0; i < ext_sigcount; i++) {
kaf24@3400 296 if (copy_from_user(&ext_sig, user_buffer + cursor + MC_HEADER_SIZE + data_size + EXT_HEADER_SIZE
kaf24@3400 297 + EXT_SIGNATURE_SIZE * i, EXT_SIGNATURE_SIZE)) {
kaf24@3400 298 printk(KERN_ERR "microcode: error! Can not read user data\n");
kaf24@3400 299 error = -EFAULT;
kaf24@3400 300 goto out;
kaf24@3400 301 }
kaf24@3400 302 for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
kaf24@3400 303 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
kaf24@3400 304 if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
kaf24@3400 305 continue;
kaf24@3400 306 if (sigmatch(ext_sig.sig, uci->sig, ext_sig.pf, uci->pf)) {
kaf24@3400 307 mark_microcode_update(cpu_num, &mc_header, ext_sig.sig, ext_sig.pf, ext_sig.cksum);
kaf24@3400 308 }
kaf24@3400 309 }
kaf24@3400 310 }
kaf24@3400 311 }
kaf24@3400 312 /* now check if any cpu has matched */
kaf24@3400 313 for (cpu_num = 0, allocated_flag = 0, sum = 0; cpu_num < num_online_cpus(); cpu_num++) {
kaf24@3400 314 if (ucode_cpu_info[cpu_num].err == MC_MARKED) {
kaf24@3400 315 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
kaf24@3400 316 if (!allocated_flag) {
kaf24@3400 317 allocated_flag = 1;
kaf24@3400 318 newmc = vmalloc(total_size);
kaf24@3400 319 if (!newmc) {
kaf24@3400 320 printk(KERN_ERR "microcode: error! Can not allocate memory\n");
kaf24@3400 321 error = -ENOMEM;
kaf24@3400 322 goto out;
kaf24@3400 323 }
kaf24@3400 324 if (copy_from_user(newmc + MC_HEADER_SIZE,
kaf24@3400 325 user_buffer + cursor + MC_HEADER_SIZE,
kaf24@3400 326 total_size - MC_HEADER_SIZE)) {
kaf24@3400 327 printk(KERN_ERR "microcode: error! Can not read user data\n");
kaf24@3400 328 vfree(newmc);
kaf24@3400 329 error = -EFAULT;
kaf24@3400 330 goto out;
kaf24@3400 331 }
kaf24@3400 332 memcpy(newmc, &mc_header, MC_HEADER_SIZE);
kaf24@3400 333 /* check extended table checksum */
kaf24@3400 334 if (ext_table_size) {
kaf24@3400 335 int ext_table_sum = 0;
kaf24@3400 336 int * ext_tablep = (((void *) newmc) + MC_HEADER_SIZE + data_size);
kaf24@3400 337 i = ext_table_size / DWSIZE;
kaf24@3400 338 while (i--) ext_table_sum += ext_tablep[i];
kaf24@3400 339 if (ext_table_sum) {
kaf24@3400 340 printk(KERN_WARNING "microcode: aborting, bad extended signature table checksum\n");
kaf24@3400 341 vfree(newmc);
kaf24@3400 342 error = -EINVAL;
kaf24@3400 343 goto out;
kaf24@3400 344 }
kaf24@3400 345 }
kaf24@3400 346
kaf24@3400 347 /* calculate the checksum */
kaf24@3400 348 i = (MC_HEADER_SIZE + data_size) / DWSIZE;
kaf24@3400 349 while (i--) sum += ((int *)newmc)[i];
kaf24@3400 350 sum -= (mc_header.sig + mc_header.pf + mc_header.cksum);
kaf24@3400 351 }
kaf24@3400 352 ucode_cpu_info[cpu_num].mc = newmc;
kaf24@3400 353 ucode_cpu_info[cpu_num].err = MC_ALLOCATED; /* mc updated */
kaf24@3400 354 if (sum + uci->sig + uci->pf + uci->cksum != 0) {
kaf24@3400 355 printk(KERN_ERR "microcode: CPU%d aborting, bad checksum\n", cpu_num);
kaf24@3400 356 error = -EINVAL;
kaf24@3400 357 goto out;
kaf24@3400 358 }
kaf24@3400 359 }
kaf24@3400 360 }
kaf24@3400 361 cursor += total_size; /* goto the next update patch */
kaf24@3400 362 } /* end of while */
kaf24@3400 363 out:
kaf24@3400 364 return error;
kaf24@3400 365 }
kaf24@3400 366
kaf24@3400 367 static void do_update_one (void * unused)
kaf24@3400 368 {
kaf24@3400 369 unsigned long flags;
kaf24@3400 370 unsigned int val[2];
kaf24@3400 371 int cpu_num = smp_processor_id();
kaf24@3400 372 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
kaf24@3400 373
kaf24@3400 374 if (uci->mc == NULL) {
kaf24@3400 375 printk(KERN_INFO "microcode: No suitable data for CPU%d\n", cpu_num);
kaf24@3400 376 return;
kaf24@3400 377 }
kaf24@3400 378
kaf24@3400 379 /* serialize access to the physical write to MSR 0x79 */
kaf24@3400 380 spin_lock_irqsave(&microcode_update_lock, flags);
kaf24@3400 381
kaf24@3400 382 /* write microcode via MSR 0x79 */
kaf24@3400 383 wrmsr(MSR_IA32_UCODE_WRITE,
kaf24@3400 384 (unsigned long) uci->mc->bits,
kaf24@3400 385 (unsigned long) uci->mc->bits >> 16 >> 16);
kaf24@3400 386 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
kaf24@3400 387
kaf24@3400 388 __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
kaf24@3400 389 /* get the current revision from MSR 0x8B */
kaf24@3400 390 rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
kaf24@3400 391
kaf24@3400 392 /* notify the caller of success on this cpu */
kaf24@3400 393 uci->err = MC_SUCCESS;
kaf24@3400 394 spin_unlock_irqrestore(&microcode_update_lock, flags);
kaf24@3400 395 printk(KERN_INFO "microcode: CPU%d updated from revision "
kaf24@3400 396 "0x%x to 0x%x, date = %08x \n",
kaf24@3400 397 cpu_num, uci->rev, val[1], uci->mc->hdr.date);
kaf24@3400 398 return;
kaf24@3400 399 }
kaf24@3400 400
kaf24@3400 401 static int do_microcode_update (void)
kaf24@3400 402 {
kaf24@3400 403 int i, error;
kaf24@3400 404
kaf24@3400 405 if (on_each_cpu(collect_cpu_info, NULL, 1, 1) != 0) {
kaf24@3400 406 printk(KERN_ERR "microcode: Error! Could not run on all processors\n");
kaf24@3400 407 error = -EIO;
kaf24@3400 408 goto out;
kaf24@3400 409 }
kaf24@3400 410
kaf24@3400 411 if ((error = find_matching_ucodes())) {
kaf24@3400 412 printk(KERN_ERR "microcode: Error in the microcode data\n");
kaf24@3400 413 goto out_free;
kaf24@3400 414 }
kaf24@3400 415
kaf24@3400 416 if (on_each_cpu(do_update_one, NULL, 1, 1) != 0) {
kaf24@3400 417 printk(KERN_ERR "microcode: Error! Could not run on all processors\n");
kaf24@3400 418 error = -EIO;
kaf24@3400 419 }
kaf24@3400 420
kaf24@3400 421 out_free:
kaf24@3400 422 for (i = 0; i < num_online_cpus(); i++) {
kaf24@3400 423 if (ucode_cpu_info[i].mc) {
kaf24@3400 424 int j;
kaf24@3400 425 void *tmp = ucode_cpu_info[i].mc;
kaf24@3400 426 vfree(tmp);
kaf24@3400 427 for (j = i; j < num_online_cpus(); j++) {
kaf24@3400 428 if (ucode_cpu_info[j].mc == tmp)
kaf24@3400 429 ucode_cpu_info[j].mc = NULL;
kaf24@3400 430 }
kaf24@3400 431 }
kaf24@3400 432 }
kaf24@3400 433 out:
kaf24@3400 434 return error;
kaf24@3400 435 }
kaf24@3400 436
kaf24@3400 437 int microcode_update(void *buf, unsigned long len)
kaf24@3400 438 {
kaf24@3400 439 int ret;
kaf24@3400 440
kaf24@3400 441 if (len < DEFAULT_UCODE_TOTALSIZE) {
kaf24@3400 442 printk(KERN_ERR "microcode: not enough data\n");
kaf24@3400 443 return -EINVAL;
kaf24@3400 444 }
kaf24@3400 445
kaf24@3400 446 down(&microcode_sem);
kaf24@3400 447
kaf24@3400 448 user_buffer = (void __user *) buf;
kaf24@3400 449 user_buffer_size = (int) len;
kaf24@3400 450
kaf24@3400 451 ret = do_microcode_update();
kaf24@3400 452
kaf24@3400 453 up(&microcode_sem);
kaf24@3400 454
kaf24@3400 455 return ret;
kaf24@3400 456 }