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  * Copyright 2018 Joyent, Inc.
  27  */
  28 /*
  29  * Copyright (c) 2010, Intel Corporation.
  30  * All rights reserved.
  31  */
  32 
  33 #include <sys/types.h>
  34 #include <sys/sysmacros.h>
  35 #include <sys/disp.h>
  36 #include <sys/promif.h>
  37 #include <sys/clock.h>
  38 #include <sys/cpuvar.h>
  39 #include <sys/stack.h>
  40 #include <vm/as.h>
  41 #include <vm/hat.h>
  42 #include <sys/reboot.h>
  43 #include <sys/avintr.h>
  44 #include <sys/vtrace.h>
  45 #include <sys/proc.h>
  46 #include <sys/thread.h>
  47 #include <sys/cpupart.h>
  48 #include <sys/pset.h>
  49 #include <sys/copyops.h>
  50 #include <sys/pg.h>
  51 #include <sys/disp.h>
  52 #include <sys/debug.h>
  53 #include <sys/sunddi.h>
  54 #include <sys/x86_archext.h>
  55 #include <sys/privregs.h>
  56 #include <sys/machsystm.h>
  57 #include <sys/ontrap.h>
  58 #include <sys/bootconf.h>
  59 #include <sys/boot_console.h>
  60 #include <sys/kdi_machimpl.h>
  61 #include <sys/archsystm.h>
  62 #include <sys/promif.h>
  63 #include <sys/pci_cfgspace.h>
  64 #include <sys/bootvfs.h>
  65 #include <sys/tsc.h>
  66 #ifdef __xpv
  67 #include <sys/hypervisor.h>
  68 #else
  69 #include <sys/xpv_support.h>
  70 #endif
  71 
  72 /*
  73  * some globals for patching the result of cpuid
  74  * to solve problems w/ creative cpu vendors
  75  */
  76 
  77 extern uint32_t cpuid_feature_ecx_include;
  78 extern uint32_t cpuid_feature_ecx_exclude;
  79 extern uint32_t cpuid_feature_edx_include;
  80 extern uint32_t cpuid_feature_edx_exclude;
  81 
  82 /*
  83  * Set console mode
  84  */
  85 static void
  86 set_console_mode(uint8_t val)
  87 {
  88         struct bop_regs rp = {0};
  89 
  90         rp.eax.byte.ah = 0x0;
  91         rp.eax.byte.al = val;
  92         rp.ebx.word.bx = 0x0;
  93 
  94         BOP_DOINT(bootops, 0x10, &rp);
  95 }
  96 
  97 
  98 /*
  99  * Setup routine called right before main(). Interposing this function
 100  * before main() allows us to call it in a machine-independent fashion.
 101  */
 102 void
 103 mlsetup(struct regs *rp)
 104 {
 105         u_longlong_t prop_value;
 106         extern struct classfuncs sys_classfuncs;
 107         extern disp_t cpu0_disp;
 108         extern char t0stack[];
 109         extern int post_fastreboot;
 110         extern uint64_t plat_dr_options;
 111 
 112         ASSERT_STACK_ALIGNED();
 113 
 114         /*
 115          * initialize cpu_self
 116          */
 117         cpu[0]->cpu_self = cpu[0];
 118 
 119 #if defined(__xpv)
 120         /*
 121          * Point at the hypervisor's virtual cpu structure
 122          */
 123         cpu[0]->cpu_m.mcpu_vcpu_info = &HYPERVISOR_shared_info->vcpu_info[0];
 124 #endif
 125 
 126         /*
 127          * check if we've got special bits to clear or set
 128          * when checking cpu features
 129          */
 130 
 131         if (bootprop_getval("cpuid_feature_ecx_include", &prop_value) != 0)
 132                 cpuid_feature_ecx_include = 0;
 133         else
 134                 cpuid_feature_ecx_include = (uint32_t)prop_value;
 135 
 136         if (bootprop_getval("cpuid_feature_ecx_exclude", &prop_value) != 0)
 137                 cpuid_feature_ecx_exclude = 0;
 138         else
 139                 cpuid_feature_ecx_exclude = (uint32_t)prop_value;
 140 
 141         if (bootprop_getval("cpuid_feature_edx_include", &prop_value) != 0)
 142                 cpuid_feature_edx_include = 0;
 143         else
 144                 cpuid_feature_edx_include = (uint32_t)prop_value;
 145 
 146         if (bootprop_getval("cpuid_feature_edx_exclude", &prop_value) != 0)
 147                 cpuid_feature_edx_exclude = 0;
 148         else
 149                 cpuid_feature_edx_exclude = (uint32_t)prop_value;
 150 
 151 #if !defined(__xpv)
 152         /*
 153          * Check to see if KPTI has been explicitly enabled or disabled.
 154          * We have to check this before init_desctbls().
 155          */
 156         if (bootprop_getval("kpti", &prop_value) == 0) {
 157                 kpti_enable = (uint64_t)(prop_value == 1);
 158                 prom_printf("unix: forcing kpti to %s due to boot argument\n",
 159                     (kpti_enable == 1) ? "ON" : "OFF");
 160         } else {
 161                 kpti_enable = 1;
 162         }
 163 
 164         if (bootprop_getval("pcid", &prop_value) == 0 && prop_value == 0) {
 165                 prom_printf("unix: forcing pcid to OFF due to boot argument\n");
 166                 x86_use_pcid = 0;
 167         } else if (kpti_enable != 1) {
 168                 x86_use_pcid = 0;
 169         }
 170 #endif
 171 
 172         /*
 173          * Initialize idt0, gdt0, ldt0_default, ktss0 and dftss.
 174          */
 175         init_desctbls();
 176 
 177         /*
 178          * lgrp_init() and possibly cpuid_pass1() need PCI config
 179          * space access
 180          */
 181 #if defined(__xpv)
 182         if (DOMAIN_IS_INITDOMAIN(xen_info))
 183                 pci_cfgspace_init();
 184 #else
 185         pci_cfgspace_init();
 186         /*
 187          * Initialize the platform type from CPU 0 to ensure that
 188          * determine_platform() is only ever called once.
 189          */
 190         determine_platform();
 191 #endif
 192 
 193         /*
 194          * The first lightweight pass (pass0) through the cpuid data
 195          * was done in locore before mlsetup was called.  Do the next
 196          * pass in C code.
 197          *
 198          * The x86_featureset is initialized here based on the capabilities
 199          * of the boot CPU.  Note that if we choose to support CPUs that have
 200          * different feature sets (at which point we would almost certainly
 201          * want to set the feature bits to correspond to the feature
 202          * minimum) this value may be altered.
 203          */
 204         cpuid_pass1(cpu[0], x86_featureset);
 205 
 206 #if !defined(__xpv)
 207         if ((get_hwenv() & HW_XEN_HVM) != 0)
 208                 xen_hvm_init();
 209 
 210         /*
 211          * Before we do anything with the TSCs, we need to work around
 212          * Intel erratum BT81.  On some CPUs, warm reset does not
 213          * clear the TSC.  If we are on such a CPU, we will clear TSC ourselves
 214          * here.  Other CPUs will clear it when we boot them later, and the
 215          * resulting skew will be handled by tsc_sync_master()/_slave();
 216          * note that such skew already exists and has to be handled anyway.
 217          *
 218          * We do this only on metal.  This same problem can occur with a
 219          * hypervisor that does not happen to virtualise a TSC that starts from
 220          * zero, regardless of CPU type; however, we do not expect hypervisors
 221          * that do not virtualise TSC that way to handle writes to TSC
 222          * correctly, either.
 223          */
 224         if (get_hwenv() == HW_NATIVE &&
 225             cpuid_getvendor(CPU) == X86_VENDOR_Intel &&
 226             cpuid_getfamily(CPU) == 6 &&
 227             (cpuid_getmodel(CPU) == 0x2d || cpuid_getmodel(CPU) == 0x3e) &&
 228             is_x86_feature(x86_featureset, X86FSET_TSC)) {
 229                 (void) wrmsr(REG_TSC, 0UL);
 230         }
 231 
 232         /*
 233          * Patch the tsc_read routine with appropriate set of instructions,
 234          * depending on the processor family and architecure, to read the
 235          * time-stamp counter while ensuring no out-of-order execution.
 236          * Patch it while the kernel text is still writable.
 237          *
 238          * Note: tsc_read is not patched for intel processors whose family
 239          * is >6 and for amd whose family >f (in case they don't support rdtscp
 240          * instruction, unlikely). By default tsc_read will use cpuid for
 241          * serialization in such cases. The following code needs to be
 242          * revisited if intel processors of family >= f retains the
 243          * instruction serialization nature of mfence instruction.
 244          * Note: tsc_read is not patched for x86 processors which do
 245          * not support "mfence". By default tsc_read will use cpuid for
 246          * serialization in such cases.
 247          *
 248          * The Xen hypervisor does not correctly report whether rdtscp is
 249          * supported or not, so we must assume that it is not.
 250          */
 251         if ((get_hwenv() & HW_XEN_HVM) == 0 &&
 252             is_x86_feature(x86_featureset, X86FSET_TSCP))
 253                 patch_tsc_read(TSC_TSCP);
 254         else if (cpuid_getvendor(CPU) == X86_VENDOR_AMD &&
 255             cpuid_getfamily(CPU) <= 0xf &&
 256             is_x86_feature(x86_featureset, X86FSET_SSE2))
 257                 patch_tsc_read(TSC_RDTSC_MFENCE);
 258         else if (cpuid_getvendor(CPU) == X86_VENDOR_Intel &&
 259             cpuid_getfamily(CPU) <= 6 &&
 260             is_x86_feature(x86_featureset, X86FSET_SSE2))
 261                 patch_tsc_read(TSC_RDTSC_LFENCE);
 262 
 263 #endif  /* !__xpv */
 264 
 265 #if defined(__i386) && !defined(__xpv)
 266         /*
 267          * Some i386 processors do not implement the rdtsc instruction,
 268          * or at least they do not implement it correctly. Patch them to
 269          * return 0.
 270          */
 271         if (!is_x86_feature(x86_featureset, X86FSET_TSC))
 272                 patch_tsc_read(TSC_NONE);
 273 #endif  /* __i386 && !__xpv */
 274 
 275 #if defined(__amd64) && !defined(__xpv)
 276         patch_memops(cpuid_getvendor(CPU));
 277 #endif  /* __amd64 && !__xpv */
 278 
 279 #if !defined(__xpv)
 280         /* XXPV what, if anything, should be dorked with here under xen? */
 281 
 282         /*
 283          * While we're thinking about the TSC, let's set up %cr4 so that
 284          * userland can issue rdtsc, and initialize the TSC_AUX value
 285          * (the cpuid) for the rdtscp instruction on appropriately
 286          * capable hardware.
 287          */
 288         if (is_x86_feature(x86_featureset, X86FSET_TSC))
 289                 setcr4(getcr4() & ~CR4_TSD);
 290 
 291         if (is_x86_feature(x86_featureset, X86FSET_TSCP))
 292                 (void) wrmsr(MSR_AMD_TSCAUX, 0);
 293 
 294         /*
 295          * Let's get the other %cr4 stuff while we're here. Note, we defer
 296          * enabling CR4_SMAP until startup_end(); however, that's importantly
 297          * before we start other CPUs. That ensures that it will be synced out
 298          * to other CPUs.
 299          */
 300         if (is_x86_feature(x86_featureset, X86FSET_DE))
 301                 setcr4(getcr4() | CR4_DE);
 302 
 303         if (is_x86_feature(x86_featureset, X86FSET_SMEP))
 304                 setcr4(getcr4() | CR4_SMEP);
 305 #endif /* __xpv */
 306 
 307         /*
 308          * initialize t0
 309          */
 310         t0.t_stk = (caddr_t)rp - MINFRAME;
 311         t0.t_stkbase = t0stack;
 312         t0.t_pri = maxclsyspri - 3;
 313         t0.t_schedflag = TS_LOAD | TS_DONT_SWAP;
 314         t0.t_procp = &p0;
 315         t0.t_plockp = &p0lock.pl_lock;
 316         t0.t_lwp = &lwp0;
 317         t0.t_forw = &t0;
 318         t0.t_back = &t0;
 319         t0.t_next = &t0;
 320         t0.t_prev = &t0;
 321         t0.t_cpu = cpu[0];
 322         t0.t_disp_queue = &cpu0_disp;
 323         t0.t_bind_cpu = PBIND_NONE;
 324         t0.t_bind_pset = PS_NONE;
 325         t0.t_bindflag = (uchar_t)default_binding_mode;
 326         t0.t_cpupart = &cp_default;
 327         t0.t_clfuncs = &sys_classfuncs.thread;
 328         t0.t_copyops = NULL;
 329         THREAD_ONPROC(&t0, CPU);
 330 
 331         lwp0.lwp_thread = &t0;
 332         lwp0.lwp_regs = (void *)rp;
 333         lwp0.lwp_procp = &p0;
 334         t0.t_tid = p0.p_lwpcnt = p0.p_lwprcnt = p0.p_lwpid = 1;
 335 
 336         p0.p_exec = NULL;
 337         p0.p_stat = SRUN;
 338         p0.p_flag = SSYS;
 339         p0.p_tlist = &t0;
 340         p0.p_stksize = 2*PAGESIZE;
 341         p0.p_stkpageszc = 0;
 342         p0.p_as = &kas;
 343         p0.p_lockp = &p0lock;
 344         p0.p_brkpageszc = 0;
 345         p0.p_t1_lgrpid = LGRP_NONE;
 346         p0.p_tr_lgrpid = LGRP_NONE;
 347         psecflags_default(&p0.p_secflags);
 348 
 349         sigorset(&p0.p_ignore, &ignoredefault);
 350 
 351         CPU->cpu_thread = &t0;
 352         bzero(&cpu0_disp, sizeof (disp_t));
 353         CPU->cpu_disp = &cpu0_disp;
 354         CPU->cpu_disp->disp_cpu = CPU;
 355         CPU->cpu_dispthread = &t0;
 356         CPU->cpu_idle_thread = &t0;
 357         CPU->cpu_flags = CPU_READY | CPU_RUNNING | CPU_EXISTS | CPU_ENABLE;
 358         CPU->cpu_dispatch_pri = t0.t_pri;
 359 
 360         CPU->cpu_id = 0;
 361 
 362         CPU->cpu_pri = 12;           /* initial PIL for the boot CPU */
 363 
 364         /*
 365          * The kernel doesn't use LDTs unless a process explicitly requests one.
 366          */
 367         p0.p_ldt_desc = null_sdesc;
 368 
 369         /*
 370          * Initialize thread/cpu microstate accounting
 371          */
 372         init_mstate(&t0, LMS_SYSTEM);
 373         init_cpu_mstate(CPU, CMS_SYSTEM);
 374 
 375         /*
 376          * Initialize lists of available and active CPUs.
 377          */
 378         cpu_list_init(CPU);
 379 
 380         pg_cpu_bootstrap(CPU);
 381 
 382         /*
 383          * Now that we have taken over the GDT, IDT and have initialized
 384          * active CPU list it's time to inform kmdb if present.
 385          */
 386         if (boothowto & RB_DEBUG)
 387                 kdi_idt_sync();
 388 
 389         if (BOP_GETPROPLEN(bootops, "efi-systab") < 0) {
 390                 /*
 391                  * In BIOS system, explicitly set console to text mode (0x3)
 392                  * if this is a boot post Fast Reboot, and the console is set
 393                  * to CONS_SCREEN_TEXT.
 394                  */
 395                 if (post_fastreboot &&
 396                     boot_console_type(NULL) == CONS_SCREEN_TEXT) {
 397                         set_console_mode(0x3);
 398                 }
 399         }
 400 
 401         /*
 402          * If requested (boot -d) drop into kmdb.
 403          *
 404          * This must be done after cpu_list_init() on the 64-bit kernel
 405          * since taking a trap requires that we re-compute gsbase based
 406          * on the cpu list.
 407          */
 408         if (boothowto & RB_DEBUGENTER)
 409                 kmdb_enter();
 410 
 411         cpu_vm_data_init(CPU);
 412 
 413         rp->r_fp = 0;        /* terminate kernel stack traces! */
 414 
 415         prom_init("kernel", (void *)NULL);
 416 
 417         /* User-set option overrides firmware value. */
 418         if (bootprop_getval(PLAT_DR_OPTIONS_NAME, &prop_value) == 0) {
 419                 plat_dr_options = (uint64_t)prop_value;
 420         }
 421 #if defined(__xpv)
 422         /* No support of DR operations on xpv */
 423         plat_dr_options = 0;
 424 #else   /* __xpv */
 425         /* Flag PLAT_DR_FEATURE_ENABLED should only be set by DR driver. */
 426         plat_dr_options &= ~PLAT_DR_FEATURE_ENABLED;
 427 #ifndef __amd64
 428         /* Only enable CPU/memory DR on 64 bits kernel. */
 429         plat_dr_options &= ~PLAT_DR_FEATURE_MEMORY;
 430         plat_dr_options &= ~PLAT_DR_FEATURE_CPU;
 431 #endif  /* __amd64 */
 432 #endif  /* __xpv */
 433 
 434         /*
 435          * Get value of "plat_dr_physmax" boot option.
 436          * It overrides values calculated from MSCT or SRAT table.
 437          */
 438         if (bootprop_getval(PLAT_DR_PHYSMAX_NAME, &prop_value) == 0) {
 439                 plat_dr_physmax = ((uint64_t)prop_value) >> PAGESHIFT;
 440         }
 441 
 442         /* Get value of boot_ncpus. */
 443         if (bootprop_getval(BOOT_NCPUS_NAME, &prop_value) != 0) {
 444                 boot_ncpus = NCPU;
 445         } else {
 446                 boot_ncpus = (int)prop_value;
 447                 if (boot_ncpus <= 0 || boot_ncpus > NCPU)
 448                         boot_ncpus = NCPU;
 449         }
 450 
 451         /*
 452          * Set max_ncpus and boot_max_ncpus to boot_ncpus if platform doesn't
 453          * support CPU DR operations.
 454          */
 455         if (plat_dr_support_cpu() == 0) {
 456                 max_ncpus = boot_max_ncpus = boot_ncpus;
 457         } else {
 458                 if (bootprop_getval(PLAT_MAX_NCPUS_NAME, &prop_value) != 0) {
 459                         max_ncpus = NCPU;
 460                 } else {
 461                         max_ncpus = (int)prop_value;
 462                         if (max_ncpus <= 0 || max_ncpus > NCPU) {
 463                                 max_ncpus = NCPU;
 464                         }
 465                         if (boot_ncpus > max_ncpus) {
 466                                 boot_ncpus = max_ncpus;
 467                         }
 468                 }
 469 
 470                 if (bootprop_getval(BOOT_MAX_NCPUS_NAME, &prop_value) != 0) {
 471                         boot_max_ncpus = boot_ncpus;
 472                 } else {
 473                         boot_max_ncpus = (int)prop_value;
 474                         if (boot_max_ncpus <= 0 || boot_max_ncpus > NCPU) {
 475                                 boot_max_ncpus = boot_ncpus;
 476                         } else if (boot_max_ncpus > max_ncpus) {
 477                                 boot_max_ncpus = max_ncpus;
 478                         }
 479                 }
 480         }
 481 
 482         /*
 483          * Initialize the lgrp framework
 484          */
 485         lgrp_init(LGRP_INIT_STAGE1);
 486 
 487         if (boothowto & RB_HALT) {
 488                 prom_printf("unix: kernel halted by -h flag\n");
 489                 prom_enter_mon();
 490         }
 491 
 492         ASSERT_STACK_ALIGNED();
 493 
 494         /*
 495          * Fill out cpu_ucode_info.  Update microcode if necessary.
 496          */
 497         ucode_check(CPU);
 498 
 499         if (workaround_errata(CPU) != 0)
 500                 panic("critical workaround(s) missing for boot cpu");
 501 }
 502 
 503 
 504 void
 505 mach_modpath(char *path, const char *filename)
 506 {
 507         /*
 508          * Construct the directory path from the filename.
 509          */
 510 
 511         int len;
 512         char *p;
 513         const char isastr[] = "/amd64";
 514         size_t isalen = strlen(isastr);
 515 
 516         len = strlen(SYSTEM_BOOT_PATH "/kernel");
 517         (void) strcpy(path, SYSTEM_BOOT_PATH "/kernel ");
 518         path += len + 1;
 519 
 520         if ((p = strrchr(filename, '/')) == NULL)
 521                 return;
 522 
 523         while (p > filename && *(p - 1) == '/')
 524                 p--;    /* remove trailing '/' characters */
 525         if (p == filename)
 526                 p++;    /* so "/" -is- the modpath in this case */
 527 
 528         /*
 529          * Remove optional isa-dependent directory name - the module
 530          * subsystem will put this back again (!)
 531          */
 532         len = p - filename;
 533         if (len > isalen &&
 534             strncmp(&filename[len - isalen], isastr, isalen) == 0)
 535                 p -= isalen;
 536 
 537         /*
 538          * "/platform/mumblefrotz" + " " + MOD_DEFPATH
 539          */
 540         len += (p - filename) + 1 + strlen(MOD_DEFPATH) + 1;
 541         (void) strncpy(path, filename, p - filename);
 542 }