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 }