1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Architecture-specific setup. 4 * 5 * Copyright (C) 1998-2003 Hewlett-Packard Co 6 * David Mosberger-Tang <davidm@hpl.hp.com> 7 * 04/11/17 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support 8 * 9 * 2005-10-07 Keith Owens <kaos@sgi.com> 10 * Add notify_die() hooks. 11 */ 12 #include <linux/cpu.h> 13 #include <linux/pm.h> 14 #include <linux/elf.h> 15 #include <linux/errno.h> 16 #include <linux/kernel.h> 17 #include <linux/mm.h> 18 #include <linux/slab.h> 19 #include <linux/module.h> 20 #include <linux/notifier.h> 21 #include <linux/personality.h> 22 #include <linux/sched.h> 23 #include <linux/sched/debug.h> 24 #include <linux/sched/hotplug.h> 25 #include <linux/sched/task.h> 26 #include <linux/sched/task_stack.h> 27 #include <linux/stddef.h> 28 #include <linux/thread_info.h> 29 #include <linux/unistd.h> 30 #include <linux/efi.h> 31 #include <linux/interrupt.h> 32 #include <linux/delay.h> 33 #include <linux/kdebug.h> 34 #include <linux/utsname.h> 35 #include <linux/tracehook.h> 36 #include <linux/rcupdate.h> 37 38 #include <asm/cpu.h> 39 #include <asm/delay.h> 40 #include <asm/elf.h> 41 #include <asm/irq.h> 42 #include <asm/kexec.h> 43 #include <asm/processor.h> 44 #include <asm/sal.h> 45 #include <asm/switch_to.h> 46 #include <asm/tlbflush.h> 47 #include <linux/uaccess.h> 48 #include <asm/unwind.h> 49 #include <asm/user.h> 50 #include <asm/xtp.h> 51 52 #include "entry.h" 53 54 #ifdef CONFIG_PERFMON 55 # include <asm/perfmon.h> 56 #endif 57 58 #include "sigframe.h" 59 60 void (*ia64_mark_idle)(int); 61 62 unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE; 63 EXPORT_SYMBOL(boot_option_idle_override); 64 void (*pm_power_off) (void); 65 EXPORT_SYMBOL(pm_power_off); 66 67 static void 68 ia64_do_show_stack (struct unw_frame_info *info, void *arg) 69 { 70 unsigned long ip, sp, bsp; 71 const char *loglvl = arg; 72 73 printk("%s\nCall Trace:\n", loglvl); 74 do { 75 unw_get_ip(info, &ip); 76 if (ip == 0) 77 break; 78 79 unw_get_sp(info, &sp); 80 unw_get_bsp(info, &bsp); 81 printk("%s [<%016lx>] %pS\n" 82 " sp=%016lx bsp=%016lx\n", 83 loglvl, ip, (void *)ip, sp, bsp); 84 } while (unw_unwind(info) >= 0); 85 } 86 87 void 88 show_stack (struct task_struct *task, unsigned long *sp, const char *loglvl) 89 { 90 if (!task) 91 unw_init_running(ia64_do_show_stack, (void *)loglvl); 92 else { 93 struct unw_frame_info info; 94 95 unw_init_from_blocked_task(&info, task); 96 ia64_do_show_stack(&info, (void *)loglvl); 97 } 98 } 99 100 void 101 show_regs (struct pt_regs *regs) 102 { 103 unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri; 104 105 print_modules(); 106 printk("\n"); 107 show_regs_print_info(KERN_DEFAULT); 108 printk("psr : %016lx ifs : %016lx ip : [<%016lx>] %s (%s)\n", 109 regs->cr_ipsr, regs->cr_ifs, ip, print_tainted(), 110 init_utsname()->release); 111 printk("ip is at %pS\n", (void *)ip); 112 printk("unat: %016lx pfs : %016lx rsc : %016lx\n", 113 regs->ar_unat, regs->ar_pfs, regs->ar_rsc); 114 printk("rnat: %016lx bsps: %016lx pr : %016lx\n", 115 regs->ar_rnat, regs->ar_bspstore, regs->pr); 116 printk("ldrs: %016lx ccv : %016lx fpsr: %016lx\n", 117 regs->loadrs, regs->ar_ccv, regs->ar_fpsr); 118 printk("csd : %016lx ssd : %016lx\n", regs->ar_csd, regs->ar_ssd); 119 printk("b0 : %016lx b6 : %016lx b7 : %016lx\n", regs->b0, regs->b6, regs->b7); 120 printk("f6 : %05lx%016lx f7 : %05lx%016lx\n", 121 regs->f6.u.bits[1], regs->f6.u.bits[0], 122 regs->f7.u.bits[1], regs->f7.u.bits[0]); 123 printk("f8 : %05lx%016lx f9 : %05lx%016lx\n", 124 regs->f8.u.bits[1], regs->f8.u.bits[0], 125 regs->f9.u.bits[1], regs->f9.u.bits[0]); 126 printk("f10 : %05lx%016lx f11 : %05lx%016lx\n", 127 regs->f10.u.bits[1], regs->f10.u.bits[0], 128 regs->f11.u.bits[1], regs->f11.u.bits[0]); 129 130 printk("r1 : %016lx r2 : %016lx r3 : %016lx\n", regs->r1, regs->r2, regs->r3); 131 printk("r8 : %016lx r9 : %016lx r10 : %016lx\n", regs->r8, regs->r9, regs->r10); 132 printk("r11 : %016lx r12 : %016lx r13 : %016lx\n", regs->r11, regs->r12, regs->r13); 133 printk("r14 : %016lx r15 : %016lx r16 : %016lx\n", regs->r14, regs->r15, regs->r16); 134 printk("r17 : %016lx r18 : %016lx r19 : %016lx\n", regs->r17, regs->r18, regs->r19); 135 printk("r20 : %016lx r21 : %016lx r22 : %016lx\n", regs->r20, regs->r21, regs->r22); 136 printk("r23 : %016lx r24 : %016lx r25 : %016lx\n", regs->r23, regs->r24, regs->r25); 137 printk("r26 : %016lx r27 : %016lx r28 : %016lx\n", regs->r26, regs->r27, regs->r28); 138 printk("r29 : %016lx r30 : %016lx r31 : %016lx\n", regs->r29, regs->r30, regs->r31); 139 140 if (user_mode(regs)) { 141 /* print the stacked registers */ 142 unsigned long val, *bsp, ndirty; 143 int i, sof, is_nat = 0; 144 145 sof = regs->cr_ifs & 0x7f; /* size of frame */ 146 ndirty = (regs->loadrs >> 19); 147 bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty); 148 for (i = 0; i < sof; ++i) { 149 get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i)); 150 printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val, 151 ((i == sof - 1) || (i % 3) == 2) ? "\n" : " "); 152 } 153 } else 154 show_stack(NULL, NULL, KERN_DEFAULT); 155 } 156 157 /* local support for deprecated console_print */ 158 void 159 console_print(const char *s) 160 { 161 printk(KERN_EMERG "%s", s); 162 } 163 164 void 165 do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall) 166 { 167 if (fsys_mode(current, &scr->pt)) { 168 /* 169 * defer signal-handling etc. until we return to 170 * privilege-level 0. 171 */ 172 if (!ia64_psr(&scr->pt)->lp) 173 ia64_psr(&scr->pt)->lp = 1; 174 return; 175 } 176 177 #ifdef CONFIG_PERFMON 178 if (current->thread.pfm_needs_checking) 179 /* 180 * Note: pfm_handle_work() allow us to call it with interrupts 181 * disabled, and may enable interrupts within the function. 182 */ 183 pfm_handle_work(); 184 #endif 185 186 /* deal with pending signal delivery */ 187 if (test_thread_flag(TIF_SIGPENDING)) { 188 local_irq_enable(); /* force interrupt enable */ 189 ia64_do_signal(scr, in_syscall); 190 } 191 192 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) { 193 local_irq_enable(); /* force interrupt enable */ 194 tracehook_notify_resume(&scr->pt); 195 } 196 197 /* copy user rbs to kernel rbs */ 198 if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) { 199 local_irq_enable(); /* force interrupt enable */ 200 ia64_sync_krbs(); 201 } 202 203 local_irq_disable(); /* force interrupt disable */ 204 } 205 206 static int __init nohalt_setup(char * str) 207 { 208 cpu_idle_poll_ctrl(true); 209 return 1; 210 } 211 __setup("nohalt", nohalt_setup); 212 213 #ifdef CONFIG_HOTPLUG_CPU 214 /* We don't actually take CPU down, just spin without interrupts. */ 215 static inline void play_dead(void) 216 { 217 unsigned int this_cpu = smp_processor_id(); 218 219 /* Ack it */ 220 __this_cpu_write(cpu_state, CPU_DEAD); 221 222 max_xtp(); 223 local_irq_disable(); 224 idle_task_exit(); 225 ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]); 226 /* 227 * The above is a point of no-return, the processor is 228 * expected to be in SAL loop now. 229 */ 230 BUG(); 231 } 232 #else 233 static inline void play_dead(void) 234 { 235 BUG(); 236 } 237 #endif /* CONFIG_HOTPLUG_CPU */ 238 239 void arch_cpu_idle_dead(void) 240 { 241 play_dead(); 242 } 243 244 void arch_cpu_idle(void) 245 { 246 void (*mark_idle)(int) = ia64_mark_idle; 247 248 #ifdef CONFIG_SMP 249 min_xtp(); 250 #endif 251 rmb(); 252 if (mark_idle) 253 (*mark_idle)(1); 254 255 safe_halt(); 256 257 if (mark_idle) 258 (*mark_idle)(0); 259 #ifdef CONFIG_SMP 260 normal_xtp(); 261 #endif 262 } 263 264 void 265 ia64_save_extra (struct task_struct *task) 266 { 267 #ifdef CONFIG_PERFMON 268 unsigned long info; 269 #endif 270 271 if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0) 272 ia64_save_debug_regs(&task->thread.dbr[0]); 273 274 #ifdef CONFIG_PERFMON 275 if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0) 276 pfm_save_regs(task); 277 278 info = __this_cpu_read(pfm_syst_info); 279 if (info & PFM_CPUINFO_SYST_WIDE) 280 pfm_syst_wide_update_task(task, info, 0); 281 #endif 282 } 283 284 void 285 ia64_load_extra (struct task_struct *task) 286 { 287 #ifdef CONFIG_PERFMON 288 unsigned long info; 289 #endif 290 291 if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0) 292 ia64_load_debug_regs(&task->thread.dbr[0]); 293 294 #ifdef CONFIG_PERFMON 295 if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0) 296 pfm_load_regs(task); 297 298 info = __this_cpu_read(pfm_syst_info); 299 if (info & PFM_CPUINFO_SYST_WIDE) 300 pfm_syst_wide_update_task(task, info, 1); 301 #endif 302 } 303 304 /* 305 * Copy the state of an ia-64 thread. 306 * 307 * We get here through the following call chain: 308 * 309 * from user-level: from kernel: 310 * 311 * <clone syscall> <some kernel call frames> 312 * sys_clone : 313 * _do_fork _do_fork 314 * copy_thread copy_thread 315 * 316 * This means that the stack layout is as follows: 317 * 318 * +---------------------+ (highest addr) 319 * | struct pt_regs | 320 * +---------------------+ 321 * | struct switch_stack | 322 * +---------------------+ 323 * | | 324 * | memory stack | 325 * | | <-- sp (lowest addr) 326 * +---------------------+ 327 * 328 * Observe that we copy the unat values that are in pt_regs and switch_stack. Spilling an 329 * integer to address X causes bit N in ar.unat to be set to the NaT bit of the register, 330 * with N=(X & 0x1ff)/8. Thus, copying the unat value preserves the NaT bits ONLY if the 331 * pt_regs structure in the parent is congruent to that of the child, modulo 512. Since 332 * the stack is page aligned and the page size is at least 4KB, this is always the case, 333 * so there is nothing to worry about. 334 */ 335 int 336 copy_thread(unsigned long clone_flags, unsigned long user_stack_base, 337 unsigned long user_stack_size, struct task_struct *p, unsigned long tls) 338 { 339 extern char ia64_ret_from_clone; 340 struct switch_stack *child_stack, *stack; 341 unsigned long rbs, child_rbs, rbs_size; 342 struct pt_regs *child_ptregs; 343 struct pt_regs *regs = current_pt_regs(); 344 int retval = 0; 345 346 child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1; 347 child_stack = (struct switch_stack *) child_ptregs - 1; 348 349 rbs = (unsigned long) current + IA64_RBS_OFFSET; 350 child_rbs = (unsigned long) p + IA64_RBS_OFFSET; 351 352 /* copy parts of thread_struct: */ 353 p->thread.ksp = (unsigned long) child_stack - 16; 354 355 /* 356 * NOTE: The calling convention considers all floating point 357 * registers in the high partition (fph) to be scratch. Since 358 * the only way to get to this point is through a system call, 359 * we know that the values in fph are all dead. Hence, there 360 * is no need to inherit the fph state from the parent to the 361 * child and all we have to do is to make sure that 362 * IA64_THREAD_FPH_VALID is cleared in the child. 363 * 364 * XXX We could push this optimization a bit further by 365 * clearing IA64_THREAD_FPH_VALID on ANY system call. 366 * However, it's not clear this is worth doing. Also, it 367 * would be a slight deviation from the normal Linux system 368 * call behavior where scratch registers are preserved across 369 * system calls (unless used by the system call itself). 370 */ 371 # define THREAD_FLAGS_TO_CLEAR (IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID \ 372 | IA64_THREAD_PM_VALID) 373 # define THREAD_FLAGS_TO_SET 0 374 p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR) 375 | THREAD_FLAGS_TO_SET); 376 377 ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */ 378 379 if (unlikely(p->flags & PF_KTHREAD)) { 380 if (unlikely(!user_stack_base)) { 381 /* fork_idle() called us */ 382 return 0; 383 } 384 memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack)); 385 child_stack->r4 = user_stack_base; /* payload */ 386 child_stack->r5 = user_stack_size; /* argument */ 387 /* 388 * Preserve PSR bits, except for bits 32-34 and 37-45, 389 * which we can't read. 390 */ 391 child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN; 392 /* mark as valid, empty frame */ 393 child_ptregs->cr_ifs = 1UL << 63; 394 child_stack->ar_fpsr = child_ptregs->ar_fpsr 395 = ia64_getreg(_IA64_REG_AR_FPSR); 396 child_stack->pr = (1 << PRED_KERNEL_STACK); 397 child_stack->ar_bspstore = child_rbs; 398 child_stack->b0 = (unsigned long) &ia64_ret_from_clone; 399 400 /* stop some PSR bits from being inherited. 401 * the psr.up/psr.pp bits must be cleared on fork but inherited on execve() 402 * therefore we must specify them explicitly here and not include them in 403 * IA64_PSR_BITS_TO_CLEAR. 404 */ 405 child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) 406 & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); 407 408 return 0; 409 } 410 stack = ((struct switch_stack *) regs) - 1; 411 /* copy parent's switch_stack & pt_regs to child: */ 412 memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack)); 413 414 /* copy the parent's register backing store to the child: */ 415 rbs_size = stack->ar_bspstore - rbs; 416 memcpy((void *) child_rbs, (void *) rbs, rbs_size); 417 if (clone_flags & CLONE_SETTLS) 418 child_ptregs->r13 = tls; 419 if (user_stack_base) { 420 child_ptregs->r12 = user_stack_base + user_stack_size - 16; 421 child_ptregs->ar_bspstore = user_stack_base; 422 child_ptregs->ar_rnat = 0; 423 child_ptregs->loadrs = 0; 424 } 425 child_stack->ar_bspstore = child_rbs + rbs_size; 426 child_stack->b0 = (unsigned long) &ia64_ret_from_clone; 427 428 /* stop some PSR bits from being inherited. 429 * the psr.up/psr.pp bits must be cleared on fork but inherited on execve() 430 * therefore we must specify them explicitly here and not include them in 431 * IA64_PSR_BITS_TO_CLEAR. 432 */ 433 child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) 434 & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); 435 436 #ifdef CONFIG_PERFMON 437 if (current->thread.pfm_context) 438 pfm_inherit(p, child_ptregs); 439 #endif 440 return retval; 441 } 442 443 asmlinkage long ia64_clone(unsigned long clone_flags, unsigned long stack_start, 444 unsigned long stack_size, unsigned long parent_tidptr, 445 unsigned long child_tidptr, unsigned long tls) 446 { 447 struct kernel_clone_args args = { 448 .flags = (lower_32_bits(clone_flags) & ~CSIGNAL), 449 .pidfd = (int __user *)parent_tidptr, 450 .child_tid = (int __user *)child_tidptr, 451 .parent_tid = (int __user *)parent_tidptr, 452 .exit_signal = (lower_32_bits(clone_flags) & CSIGNAL), 453 .stack = stack_start, 454 .stack_size = stack_size, 455 .tls = tls, 456 }; 457 458 return _do_fork(&args); 459 } 460 461 static void 462 do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg) 463 { 464 unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm; 465 unsigned long ip; 466 elf_greg_t *dst = arg; 467 struct pt_regs *pt; 468 char nat; 469 int i; 470 471 memset(dst, 0, sizeof(elf_gregset_t)); /* don't leak any kernel bits to user-level */ 472 473 if (unw_unwind_to_user(info) < 0) 474 return; 475 476 unw_get_sp(info, &sp); 477 pt = (struct pt_regs *) (sp + 16); 478 479 urbs_end = ia64_get_user_rbs_end(task, pt, &cfm); 480 481 if (ia64_sync_user_rbs(task, info->sw, pt->ar_bspstore, urbs_end) < 0) 482 return; 483 484 ia64_peek(task, info->sw, urbs_end, (long) ia64_rse_rnat_addr((long *) urbs_end), 485 &ar_rnat); 486 487 /* 488 * coredump format: 489 * r0-r31 490 * NaT bits (for r0-r31; bit N == 1 iff rN is a NaT) 491 * predicate registers (p0-p63) 492 * b0-b7 493 * ip cfm user-mask 494 * ar.rsc ar.bsp ar.bspstore ar.rnat 495 * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec 496 */ 497 498 /* r0 is zero */ 499 for (i = 1, mask = (1UL << i); i < 32; ++i) { 500 unw_get_gr(info, i, &dst[i], &nat); 501 if (nat) 502 nat_bits |= mask; 503 mask <<= 1; 504 } 505 dst[32] = nat_bits; 506 unw_get_pr(info, &dst[33]); 507 508 for (i = 0; i < 8; ++i) 509 unw_get_br(info, i, &dst[34 + i]); 510 511 unw_get_rp(info, &ip); 512 dst[42] = ip + ia64_psr(pt)->ri; 513 dst[43] = cfm; 514 dst[44] = pt->cr_ipsr & IA64_PSR_UM; 515 516 unw_get_ar(info, UNW_AR_RSC, &dst[45]); 517 /* 518 * For bsp and bspstore, unw_get_ar() would return the kernel 519 * addresses, but we need the user-level addresses instead: 520 */ 521 dst[46] = urbs_end; /* note: by convention PT_AR_BSP points to the end of the urbs! */ 522 dst[47] = pt->ar_bspstore; 523 dst[48] = ar_rnat; 524 unw_get_ar(info, UNW_AR_CCV, &dst[49]); 525 unw_get_ar(info, UNW_AR_UNAT, &dst[50]); 526 unw_get_ar(info, UNW_AR_FPSR, &dst[51]); 527 dst[52] = pt->ar_pfs; /* UNW_AR_PFS is == to pt->cr_ifs for interrupt frames */ 528 unw_get_ar(info, UNW_AR_LC, &dst[53]); 529 unw_get_ar(info, UNW_AR_EC, &dst[54]); 530 unw_get_ar(info, UNW_AR_CSD, &dst[55]); 531 unw_get_ar(info, UNW_AR_SSD, &dst[56]); 532 } 533 534 void 535 do_copy_regs (struct unw_frame_info *info, void *arg) 536 { 537 do_copy_task_regs(current, info, arg); 538 } 539 540 void 541 ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst) 542 { 543 unw_init_running(do_copy_regs, dst); 544 } 545 546 /* 547 * Flush thread state. This is called when a thread does an execve(). 548 */ 549 void 550 flush_thread (void) 551 { 552 /* drop floating-point and debug-register state if it exists: */ 553 current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID); 554 ia64_drop_fpu(current); 555 } 556 557 /* 558 * Clean up state associated with a thread. This is called when 559 * the thread calls exit(). 560 */ 561 void 562 exit_thread (struct task_struct *tsk) 563 { 564 565 ia64_drop_fpu(tsk); 566 #ifdef CONFIG_PERFMON 567 /* if needed, stop monitoring and flush state to perfmon context */ 568 if (tsk->thread.pfm_context) 569 pfm_exit_thread(tsk); 570 571 /* free debug register resources */ 572 if (tsk->thread.flags & IA64_THREAD_DBG_VALID) 573 pfm_release_debug_registers(tsk); 574 #endif 575 } 576 577 unsigned long 578 get_wchan (struct task_struct *p) 579 { 580 struct unw_frame_info info; 581 unsigned long ip; 582 int count = 0; 583 584 if (!p || p == current || p->state == TASK_RUNNING) 585 return 0; 586 587 /* 588 * Note: p may not be a blocked task (it could be current or 589 * another process running on some other CPU. Rather than 590 * trying to determine if p is really blocked, we just assume 591 * it's blocked and rely on the unwind routines to fail 592 * gracefully if the process wasn't really blocked after all. 593 * --davidm 99/12/15 594 */ 595 unw_init_from_blocked_task(&info, p); 596 do { 597 if (p->state == TASK_RUNNING) 598 return 0; 599 if (unw_unwind(&info) < 0) 600 return 0; 601 unw_get_ip(&info, &ip); 602 if (!in_sched_functions(ip)) 603 return ip; 604 } while (count++ < 16); 605 return 0; 606 } 607 608 void 609 cpu_halt (void) 610 { 611 pal_power_mgmt_info_u_t power_info[8]; 612 unsigned long min_power; 613 int i, min_power_state; 614 615 if (ia64_pal_halt_info(power_info) != 0) 616 return; 617 618 min_power_state = 0; 619 min_power = power_info[0].pal_power_mgmt_info_s.power_consumption; 620 for (i = 1; i < 8; ++i) 621 if (power_info[i].pal_power_mgmt_info_s.im 622 && power_info[i].pal_power_mgmt_info_s.power_consumption < min_power) { 623 min_power = power_info[i].pal_power_mgmt_info_s.power_consumption; 624 min_power_state = i; 625 } 626 627 while (1) 628 ia64_pal_halt(min_power_state); 629 } 630 631 void machine_shutdown(void) 632 { 633 smp_shutdown_nonboot_cpus(reboot_cpu); 634 635 #ifdef CONFIG_KEXEC 636 kexec_disable_iosapic(); 637 #endif 638 } 639 640 void 641 machine_restart (char *restart_cmd) 642 { 643 (void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0); 644 efi_reboot(REBOOT_WARM, NULL); 645 } 646 647 void 648 machine_halt (void) 649 { 650 (void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0); 651 cpu_halt(); 652 } 653 654 void 655 machine_power_off (void) 656 { 657 if (pm_power_off) 658 pm_power_off(); 659 machine_halt(); 660 } 661 662 EXPORT_SYMBOL(ia64_delay_loop); 663