1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2012 Gary Mills 23 * 24 * Copyright (c) 1993, 2010, Oracle and/or its affiliates. All rights reserved. 25 * Copyright (c) 2011 by Delphix. All rights reserved. 26 */ 27 /* 28 * Copyright (c) 2010, Intel Corporation. 29 * All rights reserved. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/sysmacros.h> 34 #include <sys/disp.h> 35 #include <sys/promif.h> 36 #include <sys/clock.h> 37 #include <sys/cpuvar.h> 38 #include <sys/stack.h> 39 #include <vm/as.h> 40 #include <vm/hat.h> 41 #include <sys/reboot.h> 42 #include <sys/avintr.h> 43 #include <sys/vtrace.h> 44 #include <sys/proc.h> 45 #include <sys/thread.h> 46 #include <sys/cpupart.h> 47 #include <sys/pset.h> 48 #include <sys/copyops.h> 49 #include <sys/pg.h> 50 #include <sys/disp.h> 51 #include <sys/debug.h> 52 #include <sys/sunddi.h> 53 #include <sys/x86_archext.h> 54 #include <sys/privregs.h> 55 #include <sys/machsystm.h> 56 #include <sys/ontrap.h> 57 #include <sys/bootconf.h> 58 #include <sys/boot_console.h> 59 #include <sys/kdi_machimpl.h> 60 #include <sys/archsystm.h> 61 #include <sys/promif.h> 62 #include <sys/pci_cfgspace.h> 63 #include <sys/bootvfs.h> 64 #ifdef __xpv 65 #include <sys/hypervisor.h> 66 #else 67 #include <sys/xpv_support.h> 68 #endif 69 70 /* 71 * some globals for patching the result of cpuid 72 * to solve problems w/ creative cpu vendors 73 */ 74 75 extern uint32_t cpuid_feature_ecx_include; 76 extern uint32_t cpuid_feature_ecx_exclude; 77 extern uint32_t cpuid_feature_edx_include; 78 extern uint32_t cpuid_feature_edx_exclude; 79 80 /* 81 * Set console mode 82 */ 83 static void 84 set_console_mode(uint8_t val) 85 { 86 struct bop_regs rp = {{0}}; 87 88 rp.eax.byte.ah = 0x0; 89 rp.eax.byte.al = val; 90 rp.ebx.word.bx = 0x0; 91 92 BOP_DOINT(bootops, 0x10, &rp); 93 } 94 95 96 /* 97 * Setup routine called right before main(). Interposing this function 98 * before main() allows us to call it in a machine-independent fashion. 99 */ 100 void 101 mlsetup(struct regs *rp) 102 { 103 u_longlong_t prop_value; 104 extern struct classfuncs sys_classfuncs; 105 extern disp_t cpu0_disp; 106 extern char t0stack[]; 107 extern int post_fastreboot; 108 extern uint64_t plat_dr_options; 109 110 ASSERT_STACK_ALIGNED(); 111 112 /* 113 * initialize cpu_self 114 */ 115 cpu[0]->cpu_self = cpu[0]; 116 117 #if defined(__xpv) 118 /* 119 * Point at the hypervisor's virtual cpu structure 120 */ 121 cpu[0]->cpu_m.mcpu_vcpu_info = &HYPERVISOR_shared_info->vcpu_info[0]; 122 #endif 123 124 /* 125 * check if we've got special bits to clear or set 126 * when checking cpu features 127 */ 128 129 if (bootprop_getval("cpuid_feature_ecx_include", &prop_value) != 0) 130 cpuid_feature_ecx_include = 0; 131 else 132 cpuid_feature_ecx_include = (uint32_t)prop_value; 133 134 if (bootprop_getval("cpuid_feature_ecx_exclude", &prop_value) != 0) 135 cpuid_feature_ecx_exclude = 0; 136 else 137 cpuid_feature_ecx_exclude = (uint32_t)prop_value; 138 139 if (bootprop_getval("cpuid_feature_edx_include", &prop_value) != 0) 140 cpuid_feature_edx_include = 0; 141 else 142 cpuid_feature_edx_include = (uint32_t)prop_value; 143 144 if (bootprop_getval("cpuid_feature_edx_exclude", &prop_value) != 0) 145 cpuid_feature_edx_exclude = 0; 146 else 147 cpuid_feature_edx_exclude = (uint32_t)prop_value; 148 149 /* 150 * Initialize idt0, gdt0, ldt0_default, ktss0 and dftss. 151 */ 152 init_desctbls(); 153 154 /* 155 * lgrp_init() and possibly cpuid_pass1() need PCI config 156 * space access 157 */ 158 #if defined(__xpv) 159 if (DOMAIN_IS_INITDOMAIN(xen_info)) 160 pci_cfgspace_init(); 161 #else 162 pci_cfgspace_init(); 163 /* 164 * Initialize the platform type from CPU 0 to ensure that 165 * determine_platform() is only ever called once. 166 */ 167 determine_platform(); 168 #endif 169 170 /* 171 * The first lightweight pass (pass0) through the cpuid data 172 * was done in locore before mlsetup was called. Do the next 173 * pass in C code. 174 * 175 * The x86_featureset is initialized here based on the capabilities 176 * of the boot CPU. Note that if we choose to support CPUs that have 177 * different feature sets (at which point we would almost certainly 178 * want to set the feature bits to correspond to the feature 179 * minimum) this value may be altered. 180 */ 181 cpuid_pass1(cpu[0], x86_featureset); 182 183 #if !defined(__xpv) 184 if ((get_hwenv() & HW_XEN_HVM) != 0) 185 xen_hvm_init(); 186 187 /* 188 * Before we do anything with the TSCs, we need to work around 189 * Intel erratum BT81. On some CPUs, warm reset does not 190 * clear the TSC. If we are on such a CPU, we will clear TSC ourselves 191 * here. Other CPUs will clear it when we boot them later, and the 192 * resulting skew will be handled by tsc_sync_master()/_slave(); 193 * note that such skew already exists and has to be handled anyway. 194 * 195 * We do this only on metal. This same problem can occur with a 196 * hypervisor that does not happen to virtualise a TSC that starts from 197 * zero, regardless of CPU type; however, we do not expect hypervisors 198 * that do not virtualise TSC that way to handle writes to TSC 199 * correctly, either. 200 */ 201 if (get_hwenv() == HW_NATIVE && 202 cpuid_getvendor(CPU) == X86_VENDOR_Intel && 203 cpuid_getfamily(CPU) == 6 && 204 (cpuid_getmodel(CPU) == 0x2d || cpuid_getmodel(CPU) == 0x3e) && 205 is_x86_feature(x86_featureset, X86FSET_TSC)) { 206 (void) wrmsr(REG_TSC, 0UL); 207 } 208 209 /* 210 * Patch the tsc_read routine with appropriate set of instructions, 211 * depending on the processor family and architecure, to read the 212 * time-stamp counter while ensuring no out-of-order execution. 213 * Patch it while the kernel text is still writable. 214 * 215 * Note: tsc_read is not patched for intel processors whose family 216 * is >6 and for amd whose family >f (in case they don't support rdtscp 217 * instruction, unlikely). By default tsc_read will use cpuid for 218 * serialization in such cases. The following code needs to be 219 * revisited if intel processors of family >= f retains the 220 * instruction serialization nature of mfence instruction. 221 * Note: tsc_read is not patched for x86 processors which do 222 * not support "mfence". By default tsc_read will use cpuid for 223 * serialization in such cases. 224 * 225 * The Xen hypervisor does not correctly report whether rdtscp is 226 * supported or not, so we must assume that it is not. 227 */ 228 if ((get_hwenv() & HW_XEN_HVM) == 0 && 229 is_x86_feature(x86_featureset, X86FSET_TSCP)) 230 patch_tsc_read(X86_HAVE_TSCP); 231 else if (cpuid_getvendor(CPU) == X86_VENDOR_AMD && 232 cpuid_getfamily(CPU) <= 0xf && 233 is_x86_feature(x86_featureset, X86FSET_SSE2)) 234 patch_tsc_read(X86_TSC_MFENCE); 235 else if (cpuid_getvendor(CPU) == X86_VENDOR_Intel && 236 cpuid_getfamily(CPU) <= 6 && 237 is_x86_feature(x86_featureset, X86FSET_SSE2)) 238 patch_tsc_read(X86_TSC_LFENCE); 239 240 #endif /* !__xpv */ 241 242 #if defined(__i386) && !defined(__xpv) 243 /* 244 * Some i386 processors do not implement the rdtsc instruction, 245 * or at least they do not implement it correctly. Patch them to 246 * return 0. 247 */ 248 if (!is_x86_feature(x86_featureset, X86FSET_TSC)) 249 patch_tsc_read(X86_NO_TSC); 250 #endif /* __i386 && !__xpv */ 251 252 #if defined(__amd64) && !defined(__xpv) 253 patch_memops(cpuid_getvendor(CPU)); 254 #endif /* __amd64 && !__xpv */ 255 256 #if !defined(__xpv) 257 /* XXPV what, if anything, should be dorked with here under xen? */ 258 259 /* 260 * While we're thinking about the TSC, let's set up %cr4 so that 261 * userland can issue rdtsc, and initialize the TSC_AUX value 262 * (the cpuid) for the rdtscp instruction on appropriately 263 * capable hardware. 264 */ 265 if (is_x86_feature(x86_featureset, X86FSET_TSC)) 266 setcr4(getcr4() & ~CR4_TSD); 267 268 if (is_x86_feature(x86_featureset, X86FSET_TSCP)) 269 (void) wrmsr(MSR_AMD_TSCAUX, 0); 270 271 /* 272 * Let's get the other %cr4 stuff while we're here. Note, we defer 273 * enabling CR4_SMAP until startup_end(); however, that's importantly 274 * before we start other CPUs. That ensures that it will be synced out 275 * to other CPUs. 276 */ 277 if (is_x86_feature(x86_featureset, X86FSET_DE)) 278 setcr4(getcr4() | CR4_DE); 279 280 if (is_x86_feature(x86_featureset, X86FSET_SMEP)) 281 setcr4(getcr4() | CR4_SMEP); 282 #endif /* __xpv */ 283 284 /* 285 * initialize t0 286 */ 287 t0.t_stk = (caddr_t)rp - MINFRAME; 288 t0.t_stkbase = t0stack; 289 t0.t_pri = maxclsyspri - 3; 290 t0.t_schedflag = TS_LOAD | TS_DONT_SWAP; 291 t0.t_procp = &p0; 292 t0.t_plockp = &p0lock.pl_lock; 293 t0.t_lwp = &lwp0; 294 t0.t_forw = &t0; 295 t0.t_back = &t0; 296 t0.t_next = &t0; 297 t0.t_prev = &t0; 298 t0.t_cpu = cpu[0]; 299 t0.t_disp_queue = &cpu0_disp; 300 t0.t_bind_cpu = PBIND_NONE; 301 t0.t_bind_pset = PS_NONE; 302 t0.t_bindflag = (uchar_t)default_binding_mode; 303 t0.t_cpupart = &cp_default; 304 t0.t_clfuncs = &sys_classfuncs.thread; 305 t0.t_copyops = NULL; 306 THREAD_ONPROC(&t0, CPU); 307 308 lwp0.lwp_thread = &t0; 309 lwp0.lwp_regs = (void *)rp; 310 lwp0.lwp_procp = &p0; 311 t0.t_tid = p0.p_lwpcnt = p0.p_lwprcnt = p0.p_lwpid = 1; 312 313 p0.p_exec = NULL; 314 p0.p_stat = SRUN; 315 p0.p_flag = SSYS; 316 p0.p_tlist = &t0; 317 p0.p_stksize = 2*PAGESIZE; 318 p0.p_stkpageszc = 0; 319 p0.p_as = &kas; 320 p0.p_lockp = &p0lock; 321 p0.p_brkpageszc = 0; 322 p0.p_t1_lgrpid = LGRP_NONE; 323 p0.p_tr_lgrpid = LGRP_NONE; 324 sigorset(&p0.p_ignore, &ignoredefault); 325 326 CPU->cpu_thread = &t0; 327 bzero(&cpu0_disp, sizeof (disp_t)); 328 CPU->cpu_disp = &cpu0_disp; 329 CPU->cpu_disp->disp_cpu = CPU; 330 CPU->cpu_dispthread = &t0; 331 CPU->cpu_idle_thread = &t0; 332 CPU->cpu_flags = CPU_READY | CPU_RUNNING | CPU_EXISTS | CPU_ENABLE; 333 CPU->cpu_dispatch_pri = t0.t_pri; 334 335 CPU->cpu_id = 0; 336 337 CPU->cpu_pri = 12; /* initial PIL for the boot CPU */ 338 339 /* 340 * The kernel doesn't use LDTs unless a process explicitly requests one. 341 */ 342 p0.p_ldt_desc = null_sdesc; 343 344 /* 345 * Initialize thread/cpu microstate accounting 346 */ 347 init_mstate(&t0, LMS_SYSTEM); 348 init_cpu_mstate(CPU, CMS_SYSTEM); 349 350 /* 351 * Initialize lists of available and active CPUs. 352 */ 353 cpu_list_init(CPU); 354 355 pg_cpu_bootstrap(CPU); 356 357 /* 358 * Now that we have taken over the GDT, IDT and have initialized 359 * active CPU list it's time to inform kmdb if present. 360 */ 361 if (boothowto & RB_DEBUG) 362 kdi_idt_sync(); 363 364 /* 365 * Explicitly set console to text mode (0x3) if this is a boot 366 * post Fast Reboot, and the console is set to CONS_SCREEN_TEXT. 367 */ 368 if (post_fastreboot && boot_console_type(NULL) == CONS_SCREEN_TEXT) 369 set_console_mode(0x3); 370 371 /* 372 * If requested (boot -d) drop into kmdb. 373 * 374 * This must be done after cpu_list_init() on the 64-bit kernel 375 * since taking a trap requires that we re-compute gsbase based 376 * on the cpu list. 377 */ 378 if (boothowto & RB_DEBUGENTER) 379 kmdb_enter(); 380 381 cpu_vm_data_init(CPU); 382 383 rp->r_fp = 0; /* terminate kernel stack traces! */ 384 385 prom_init("kernel", (void *)NULL); 386 387 /* User-set option overrides firmware value. */ 388 if (bootprop_getval(PLAT_DR_OPTIONS_NAME, &prop_value) == 0) { 389 plat_dr_options = (uint64_t)prop_value; 390 } 391 #if defined(__xpv) 392 /* No support of DR operations on xpv */ 393 plat_dr_options = 0; 394 #else /* __xpv */ 395 /* Flag PLAT_DR_FEATURE_ENABLED should only be set by DR driver. */ 396 plat_dr_options &= ~PLAT_DR_FEATURE_ENABLED; 397 #ifndef __amd64 398 /* Only enable CPU/memory DR on 64 bits kernel. */ 399 plat_dr_options &= ~PLAT_DR_FEATURE_MEMORY; 400 plat_dr_options &= ~PLAT_DR_FEATURE_CPU; 401 #endif /* __amd64 */ 402 #endif /* __xpv */ 403 404 /* 405 * Get value of "plat_dr_physmax" boot option. 406 * It overrides values calculated from MSCT or SRAT table. 407 */ 408 if (bootprop_getval(PLAT_DR_PHYSMAX_NAME, &prop_value) == 0) { 409 plat_dr_physmax = ((uint64_t)prop_value) >> PAGESHIFT; 410 } 411 412 /* Get value of boot_ncpus. */ 413 if (bootprop_getval(BOOT_NCPUS_NAME, &prop_value) != 0) { 414 boot_ncpus = NCPU; 415 } else { 416 boot_ncpus = (int)prop_value; 417 if (boot_ncpus <= 0 || boot_ncpus > NCPU) 418 boot_ncpus = NCPU; 419 } 420 421 /* 422 * Set max_ncpus and boot_max_ncpus to boot_ncpus if platform doesn't 423 * support CPU DR operations. 424 */ 425 if (plat_dr_support_cpu() == 0) { 426 max_ncpus = boot_max_ncpus = boot_ncpus; 427 } else { 428 if (bootprop_getval(PLAT_MAX_NCPUS_NAME, &prop_value) != 0) { 429 max_ncpus = NCPU; 430 } else { 431 max_ncpus = (int)prop_value; 432 if (max_ncpus <= 0 || max_ncpus > NCPU) { 433 max_ncpus = NCPU; 434 } 435 if (boot_ncpus > max_ncpus) { 436 boot_ncpus = max_ncpus; 437 } 438 } 439 440 if (bootprop_getval(BOOT_MAX_NCPUS_NAME, &prop_value) != 0) { 441 boot_max_ncpus = boot_ncpus; 442 } else { 443 boot_max_ncpus = (int)prop_value; 444 if (boot_max_ncpus <= 0 || boot_max_ncpus > NCPU) { 445 boot_max_ncpus = boot_ncpus; 446 } else if (boot_max_ncpus > max_ncpus) { 447 boot_max_ncpus = max_ncpus; 448 } 449 } 450 } 451 452 /* 453 * Initialize the lgrp framework 454 */ 455 lgrp_init(LGRP_INIT_STAGE1); 456 457 if (boothowto & RB_HALT) { 458 prom_printf("unix: kernel halted by -h flag\n"); 459 prom_enter_mon(); 460 } 461 462 ASSERT_STACK_ALIGNED(); 463 464 /* 465 * Fill out cpu_ucode_info. Update microcode if necessary. 466 */ 467 ucode_check(CPU); 468 469 if (workaround_errata(CPU) != 0) 470 panic("critical workaround(s) missing for boot cpu"); 471 } 472 473 474 void 475 mach_modpath(char *path, const char *filename) 476 { 477 /* 478 * Construct the directory path from the filename. 479 */ 480 481 int len; 482 char *p; 483 const char isastr[] = "/amd64"; 484 size_t isalen = strlen(isastr); 485 486 len = strlen(SYSTEM_BOOT_PATH "/kernel"); 487 (void) strcpy(path, SYSTEM_BOOT_PATH "/kernel "); 488 path += len + 1; 489 490 if ((p = strrchr(filename, '/')) == NULL) 491 return; 492 493 while (p > filename && *(p - 1) == '/') 494 p--; /* remove trailing '/' characters */ 495 if (p == filename) 496 p++; /* so "/" -is- the modpath in this case */ 497 498 /* 499 * Remove optional isa-dependent directory name - the module 500 * subsystem will put this back again (!) 501 */ 502 len = p - filename; 503 if (len > isalen && 504 strncmp(&filename[len - isalen], isastr, isalen) == 0) 505 p -= isalen; 506 507 /* 508 * "/platform/mumblefrotz" + " " + MOD_DEFPATH 509 */ 510 len += (p - filename) + 1 + strlen(MOD_DEFPATH) + 1; 511 (void) strncpy(path, filename, p - filename); 512 }