ACPI: Create "idle=halt" bootparam
[linux-2.6-block.git] / arch / ia64 / kernel / process.c
CommitLineData
1da177e4
LT
1/*
2 * Architecture-specific setup.
3 *
4 * Copyright (C) 1998-2003 Hewlett-Packard Co
5 * David Mosberger-Tang <davidm@hpl.hp.com>
b8d8b883 6 * 04/11/17 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support
9138d581
KO
7 *
8 * 2005-10-07 Keith Owens <kaos@sgi.com>
9 * Add notify_die() hooks.
1da177e4 10 */
1da177e4
LT
11#include <linux/cpu.h>
12#include <linux/pm.h>
13#include <linux/elf.h>
14#include <linux/errno.h>
15#include <linux/kallsyms.h>
16#include <linux/kernel.h>
17#include <linux/mm.h>
18#include <linux/module.h>
19#include <linux/notifier.h>
20#include <linux/personality.h>
21#include <linux/sched.h>
22#include <linux/slab.h>
1da177e4
LT
23#include <linux/stddef.h>
24#include <linux/thread_info.h>
25#include <linux/unistd.h>
26#include <linux/efi.h>
27#include <linux/interrupt.h>
28#include <linux/delay.h>
1eeb66a1 29#include <linux/kdebug.h>
ee211b37 30#include <linux/utsname.h>
1da177e4
LT
31
32#include <asm/cpu.h>
33#include <asm/delay.h>
34#include <asm/elf.h>
35#include <asm/ia32.h>
36#include <asm/irq.h>
c237508a 37#include <asm/kexec.h>
1da177e4
LT
38#include <asm/pgalloc.h>
39#include <asm/processor.h>
40#include <asm/sal.h>
41#include <asm/tlbflush.h>
42#include <asm/uaccess.h>
43#include <asm/unwind.h>
44#include <asm/user.h>
45
46#include "entry.h"
47
48#ifdef CONFIG_PERFMON
49# include <asm/perfmon.h>
50#endif
51
52#include "sigframe.h"
53
54void (*ia64_mark_idle)(int);
1da177e4
LT
55
56unsigned long boot_option_idle_override = 0;
57EXPORT_SYMBOL(boot_option_idle_override);
c1e3b377
ZY
58unsigned long idle_halt;
59EXPORT_SYMBOL(idle_halt);
1da177e4
LT
60
61void
62ia64_do_show_stack (struct unw_frame_info *info, void *arg)
63{
64 unsigned long ip, sp, bsp;
65 char buf[128]; /* don't make it so big that it overflows the stack! */
66
67 printk("\nCall Trace:\n");
68 do {
69 unw_get_ip(info, &ip);
70 if (ip == 0)
71 break;
72
73 unw_get_sp(info, &sp);
74 unw_get_bsp(info, &bsp);
75 snprintf(buf, sizeof(buf),
76 " [<%016lx>] %%s\n"
77 " sp=%016lx bsp=%016lx\n",
78 ip, sp, bsp);
79 print_symbol(buf, ip);
80 } while (unw_unwind(info) >= 0);
81}
82
83void
84show_stack (struct task_struct *task, unsigned long *sp)
85{
86 if (!task)
87 unw_init_running(ia64_do_show_stack, NULL);
88 else {
89 struct unw_frame_info info;
90
91 unw_init_from_blocked_task(&info, task);
92 ia64_do_show_stack(&info, NULL);
93 }
94}
95
96void
97dump_stack (void)
98{
99 show_stack(NULL, NULL);
100}
101
102EXPORT_SYMBOL(dump_stack);
103
104void
105show_regs (struct pt_regs *regs)
106{
107 unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri;
108
109 print_modules();
19c5870c
AD
110 printk("\nPid: %d, CPU %d, comm: %20s\n", task_pid_nr(current),
111 smp_processor_id(), current->comm);
ee211b37
LT
112 printk("psr : %016lx ifs : %016lx ip : [<%016lx>] %s (%s)\n",
113 regs->cr_ipsr, regs->cr_ifs, ip, print_tainted(),
114 init_utsname()->release);
1da177e4
LT
115 print_symbol("ip is at %s\n", ip);
116 printk("unat: %016lx pfs : %016lx rsc : %016lx\n",
117 regs->ar_unat, regs->ar_pfs, regs->ar_rsc);
118 printk("rnat: %016lx bsps: %016lx pr : %016lx\n",
119 regs->ar_rnat, regs->ar_bspstore, regs->pr);
120 printk("ldrs: %016lx ccv : %016lx fpsr: %016lx\n",
121 regs->loadrs, regs->ar_ccv, regs->ar_fpsr);
122 printk("csd : %016lx ssd : %016lx\n", regs->ar_csd, regs->ar_ssd);
123 printk("b0 : %016lx b6 : %016lx b7 : %016lx\n", regs->b0, regs->b6, regs->b7);
124 printk("f6 : %05lx%016lx f7 : %05lx%016lx\n",
125 regs->f6.u.bits[1], regs->f6.u.bits[0],
126 regs->f7.u.bits[1], regs->f7.u.bits[0]);
127 printk("f8 : %05lx%016lx f9 : %05lx%016lx\n",
128 regs->f8.u.bits[1], regs->f8.u.bits[0],
129 regs->f9.u.bits[1], regs->f9.u.bits[0]);
130 printk("f10 : %05lx%016lx f11 : %05lx%016lx\n",
131 regs->f10.u.bits[1], regs->f10.u.bits[0],
132 regs->f11.u.bits[1], regs->f11.u.bits[0]);
133
134 printk("r1 : %016lx r2 : %016lx r3 : %016lx\n", regs->r1, regs->r2, regs->r3);
135 printk("r8 : %016lx r9 : %016lx r10 : %016lx\n", regs->r8, regs->r9, regs->r10);
136 printk("r11 : %016lx r12 : %016lx r13 : %016lx\n", regs->r11, regs->r12, regs->r13);
137 printk("r14 : %016lx r15 : %016lx r16 : %016lx\n", regs->r14, regs->r15, regs->r16);
138 printk("r17 : %016lx r18 : %016lx r19 : %016lx\n", regs->r17, regs->r18, regs->r19);
139 printk("r20 : %016lx r21 : %016lx r22 : %016lx\n", regs->r20, regs->r21, regs->r22);
140 printk("r23 : %016lx r24 : %016lx r25 : %016lx\n", regs->r23, regs->r24, regs->r25);
141 printk("r26 : %016lx r27 : %016lx r28 : %016lx\n", regs->r26, regs->r27, regs->r28);
142 printk("r29 : %016lx r30 : %016lx r31 : %016lx\n", regs->r29, regs->r30, regs->r31);
143
144 if (user_mode(regs)) {
145 /* print the stacked registers */
146 unsigned long val, *bsp, ndirty;
147 int i, sof, is_nat = 0;
148
149 sof = regs->cr_ifs & 0x7f; /* size of frame */
150 ndirty = (regs->loadrs >> 19);
151 bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty);
152 for (i = 0; i < sof; ++i) {
153 get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i));
154 printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val,
155 ((i == sof - 1) || (i % 3) == 2) ? "\n" : " ");
156 }
157 } else
158 show_stack(NULL, NULL);
159}
160
5aa92ffd
PT
161void tsk_clear_notify_resume(struct task_struct *tsk)
162{
163#ifdef CONFIG_PERFMON
164 if (tsk->thread.pfm_needs_checking)
165 return;
166#endif
3b2ce0b1
PT
167 if (test_ti_thread_flag(task_thread_info(tsk), TIF_RESTORE_RSE))
168 return;
5aa92ffd
PT
169 clear_ti_thread_flag(task_thread_info(tsk), TIF_NOTIFY_RESUME);
170}
171
3633c730
HS
172/*
173 * do_notify_resume_user():
174 * Called from notify_resume_user at entry.S, with interrupts disabled.
175 */
1da177e4 176void
3633c730 177do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
1da177e4
LT
178{
179 if (fsys_mode(current, &scr->pt)) {
3633c730
HS
180 /*
181 * defer signal-handling etc. until we return to
182 * privilege-level 0.
183 */
1da177e4
LT
184 if (!ia64_psr(&scr->pt)->lp)
185 ia64_psr(&scr->pt)->lp = 1;
186 return;
187 }
188
189#ifdef CONFIG_PERFMON
190 if (current->thread.pfm_needs_checking)
3633c730
HS
191 /*
192 * Note: pfm_handle_work() allow us to call it with interrupts
193 * disabled, and may enable interrupts within the function.
194 */
1da177e4
LT
195 pfm_handle_work();
196#endif
197
198 /* deal with pending signal delivery */
3633c730
HS
199 if (test_thread_flag(TIF_SIGPENDING)) {
200 local_irq_enable(); /* force interrupt enable */
4a177cbf 201 ia64_do_signal(scr, in_syscall);
3633c730 202 }
3b2ce0b1
PT
203
204 /* copy user rbs to kernel rbs */
3633c730
HS
205 if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) {
206 local_irq_enable(); /* force interrupt enable */
3b2ce0b1 207 ia64_sync_krbs();
3633c730
HS
208 }
209
210 local_irq_disable(); /* force interrupt disable */
1da177e4
LT
211}
212
8df5a500
SE
213static int pal_halt = 1;
214static int can_do_pal_halt = 1;
215
1da177e4
LT
216static int __init nohalt_setup(char * str)
217{
fb573856 218 pal_halt = can_do_pal_halt = 0;
1da177e4
LT
219 return 1;
220}
221__setup("nohalt", nohalt_setup);
222
a71f62ed 223void
8df5a500
SE
224update_pal_halt_status(int status)
225{
226 can_do_pal_halt = pal_halt && status;
227}
228
1da177e4
LT
229/*
230 * We use this if we don't have any better idle routine..
231 */
232void
233default_idle (void)
234{
6c4fa560 235 local_irq_enable();
64c7c8f8 236 while (!need_resched()) {
71416bea
DS
237 if (can_do_pal_halt) {
238 local_irq_disable();
239 if (!need_resched()) {
240 safe_halt();
241 }
242 local_irq_enable();
243 } else
1da177e4 244 cpu_relax();
64c7c8f8 245 }
1da177e4
LT
246}
247
248#ifdef CONFIG_HOTPLUG_CPU
249/* We don't actually take CPU down, just spin without interrupts. */
250static inline void play_dead(void)
251{
252 extern void ia64_cpu_local_tick (void);
b8d8b883
AR
253 unsigned int this_cpu = smp_processor_id();
254
1da177e4
LT
255 /* Ack it */
256 __get_cpu_var(cpu_state) = CPU_DEAD;
257
1da177e4
LT
258 max_xtp();
259 local_irq_disable();
b8d8b883
AR
260 idle_task_exit();
261 ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]);
1da177e4 262 /*
b8d8b883
AR
263 * The above is a point of no-return, the processor is
264 * expected to be in SAL loop now.
1da177e4 265 */
b8d8b883 266 BUG();
1da177e4
LT
267}
268#else
269static inline void play_dead(void)
270{
271 BUG();
272}
273#endif /* CONFIG_HOTPLUG_CPU */
274
42763935 275static void do_nothing(void *unused)
1da177e4 276{
42763935 277}
7d5f9c0f 278
42763935
TL
279/*
280 * cpu_idle_wait - Used to ensure that all the CPUs discard old value of
281 * pm_idle and update to new pm_idle value. Required while changing pm_idle
282 * handler on SMP systems.
283 *
284 * Caller must have changed pm_idle to the new value before the call. Old
285 * pm_idle value will not be used by any CPU after the return of this function.
286 */
287void cpu_idle_wait(void)
288{
289 smp_mb();
290 /* kick all the CPUs so that they exit out of pm_idle */
8691e5a8 291 smp_call_function(do_nothing, NULL, 1);
1da177e4
LT
292}
293EXPORT_SYMBOL_GPL(cpu_idle_wait);
294
295void __attribute__((noreturn))
296cpu_idle (void)
297{
298 void (*mark_idle)(int) = ia64_mark_idle;
64c7c8f8 299 int cpu = smp_processor_id();
1da177e4
LT
300
301 /* endless idle loop with no priority at all */
302 while (1) {
0888f06a 303 if (can_do_pal_halt) {
495ab9c0 304 current_thread_info()->status &= ~TS_POLLING;
0888f06a
IM
305 /*
306 * TS_POLLING-cleared state must be visible before we
307 * test NEED_RESCHED:
308 */
309 smp_mb();
310 } else {
495ab9c0 311 current_thread_info()->status |= TS_POLLING;
0888f06a 312 }
1e185b97 313
64c7c8f8
NP
314 if (!need_resched()) {
315 void (*idle)(void);
1da177e4 316#ifdef CONFIG_SMP
1da177e4
LT
317 min_xtp();
318#endif
7d5f9c0f 319 rmb();
1da177e4
LT
320 if (mark_idle)
321 (*mark_idle)(1);
322
1da177e4
LT
323 idle = pm_idle;
324 if (!idle)
325 idle = default_idle;
326 (*idle)();
64c7c8f8
NP
327 if (mark_idle)
328 (*mark_idle)(0);
1da177e4 329#ifdef CONFIG_SMP
64c7c8f8 330 normal_xtp();
1da177e4 331#endif
64c7c8f8 332 }
5bfb5d69 333 preempt_enable_no_resched();
1da177e4 334 schedule();
5bfb5d69 335 preempt_disable();
1da177e4 336 check_pgt_cache();
64c7c8f8 337 if (cpu_is_offline(cpu))
1da177e4
LT
338 play_dead();
339 }
340}
341
342void
343ia64_save_extra (struct task_struct *task)
344{
345#ifdef CONFIG_PERFMON
346 unsigned long info;
347#endif
348
349 if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
350 ia64_save_debug_regs(&task->thread.dbr[0]);
351
352#ifdef CONFIG_PERFMON
353 if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0)
354 pfm_save_regs(task);
355
356 info = __get_cpu_var(pfm_syst_info);
357 if (info & PFM_CPUINFO_SYST_WIDE)
358 pfm_syst_wide_update_task(task, info, 0);
359#endif
360
361#ifdef CONFIG_IA32_SUPPORT
6450578f 362 if (IS_IA32_PROCESS(task_pt_regs(task)))
1da177e4
LT
363 ia32_save_state(task);
364#endif
365}
366
367void
368ia64_load_extra (struct task_struct *task)
369{
370#ifdef CONFIG_PERFMON
371 unsigned long info;
372#endif
373
374 if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
375 ia64_load_debug_regs(&task->thread.dbr[0]);
376
377#ifdef CONFIG_PERFMON
378 if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0)
379 pfm_load_regs(task);
380
381 info = __get_cpu_var(pfm_syst_info);
382 if (info & PFM_CPUINFO_SYST_WIDE)
383 pfm_syst_wide_update_task(task, info, 1);
384#endif
385
386#ifdef CONFIG_IA32_SUPPORT
6450578f 387 if (IS_IA32_PROCESS(task_pt_regs(task)))
1da177e4
LT
388 ia32_load_state(task);
389#endif
390}
391
392/*
393 * Copy the state of an ia-64 thread.
394 *
395 * We get here through the following call chain:
396 *
397 * from user-level: from kernel:
398 *
399 * <clone syscall> <some kernel call frames>
400 * sys_clone :
401 * do_fork do_fork
402 * copy_thread copy_thread
403 *
404 * This means that the stack layout is as follows:
405 *
406 * +---------------------+ (highest addr)
407 * | struct pt_regs |
408 * +---------------------+
409 * | struct switch_stack |
410 * +---------------------+
411 * | |
412 * | memory stack |
413 * | | <-- sp (lowest addr)
414 * +---------------------+
415 *
416 * Observe that we copy the unat values that are in pt_regs and switch_stack. Spilling an
417 * integer to address X causes bit N in ar.unat to be set to the NaT bit of the register,
418 * with N=(X & 0x1ff)/8. Thus, copying the unat value preserves the NaT bits ONLY if the
419 * pt_regs structure in the parent is congruent to that of the child, modulo 512. Since
420 * the stack is page aligned and the page size is at least 4KB, this is always the case,
421 * so there is nothing to worry about.
422 */
423int
424copy_thread (int nr, unsigned long clone_flags,
425 unsigned long user_stack_base, unsigned long user_stack_size,
426 struct task_struct *p, struct pt_regs *regs)
427{
428 extern char ia64_ret_from_clone, ia32_ret_from_clone;
429 struct switch_stack *child_stack, *stack;
430 unsigned long rbs, child_rbs, rbs_size;
431 struct pt_regs *child_ptregs;
432 int retval = 0;
433
434#ifdef CONFIG_SMP
435 /*
436 * For SMP idle threads, fork_by_hand() calls do_fork with
437 * NULL regs.
438 */
439 if (!regs)
440 return 0;
441#endif
442
443 stack = ((struct switch_stack *) regs) - 1;
444
445 child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1;
446 child_stack = (struct switch_stack *) child_ptregs - 1;
447
448 /* copy parent's switch_stack & pt_regs to child: */
449 memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack));
450
451 rbs = (unsigned long) current + IA64_RBS_OFFSET;
452 child_rbs = (unsigned long) p + IA64_RBS_OFFSET;
453 rbs_size = stack->ar_bspstore - rbs;
454
455 /* copy the parent's register backing store to the child: */
456 memcpy((void *) child_rbs, (void *) rbs, rbs_size);
457
458 if (likely(user_mode(child_ptregs))) {
459 if ((clone_flags & CLONE_SETTLS) && !IS_IA32_PROCESS(regs))
460 child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */
461 if (user_stack_base) {
462 child_ptregs->r12 = user_stack_base + user_stack_size - 16;
463 child_ptregs->ar_bspstore = user_stack_base;
464 child_ptregs->ar_rnat = 0;
465 child_ptregs->loadrs = 0;
466 }
467 } else {
468 /*
469 * Note: we simply preserve the relative position of
470 * the stack pointer here. There is no need to
471 * allocate a scratch area here, since that will have
472 * been taken care of by the caller of sys_clone()
473 * already.
474 */
475 child_ptregs->r12 = (unsigned long) child_ptregs - 16; /* kernel sp */
476 child_ptregs->r13 = (unsigned long) p; /* set `current' pointer */
477 }
478 child_stack->ar_bspstore = child_rbs + rbs_size;
479 if (IS_IA32_PROCESS(regs))
480 child_stack->b0 = (unsigned long) &ia32_ret_from_clone;
481 else
482 child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
483
484 /* copy parts of thread_struct: */
485 p->thread.ksp = (unsigned long) child_stack - 16;
486
487 /* stop some PSR bits from being inherited.
488 * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
489 * therefore we must specify them explicitly here and not include them in
490 * IA64_PSR_BITS_TO_CLEAR.
491 */
492 child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
493 & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
494
495 /*
496 * NOTE: The calling convention considers all floating point
497 * registers in the high partition (fph) to be scratch. Since
498 * the only way to get to this point is through a system call,
499 * we know that the values in fph are all dead. Hence, there
500 * is no need to inherit the fph state from the parent to the
501 * child and all we have to do is to make sure that
502 * IA64_THREAD_FPH_VALID is cleared in the child.
503 *
504 * XXX We could push this optimization a bit further by
505 * clearing IA64_THREAD_FPH_VALID on ANY system call.
506 * However, it's not clear this is worth doing. Also, it
507 * would be a slight deviation from the normal Linux system
508 * call behavior where scratch registers are preserved across
509 * system calls (unless used by the system call itself).
510 */
511# define THREAD_FLAGS_TO_CLEAR (IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID \
512 | IA64_THREAD_PM_VALID)
513# define THREAD_FLAGS_TO_SET 0
514 p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR)
515 | THREAD_FLAGS_TO_SET);
516 ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */
517#ifdef CONFIG_IA32_SUPPORT
518 /*
519 * If we're cloning an IA32 task then save the IA32 extra
520 * state from the current task to the new task
521 */
6450578f 522 if (IS_IA32_PROCESS(task_pt_regs(current))) {
1da177e4
LT
523 ia32_save_state(p);
524 if (clone_flags & CLONE_SETTLS)
525 retval = ia32_clone_tls(p, child_ptregs);
526
527 /* Copy partially mapped page list */
528 if (!retval)
3b74d18e 529 retval = ia32_copy_ia64_partial_page_list(p,
530 clone_flags);
1da177e4
LT
531 }
532#endif
533
534#ifdef CONFIG_PERFMON
535 if (current->thread.pfm_context)
536 pfm_inherit(p, child_ptregs);
537#endif
538 return retval;
539}
540
541static void
542do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg)
543{
256a7e09
JS
544 unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm;
545 unsigned long uninitialized_var(ip); /* GCC be quiet */
1da177e4
LT
546 elf_greg_t *dst = arg;
547 struct pt_regs *pt;
548 char nat;
549 int i;
550
551 memset(dst, 0, sizeof(elf_gregset_t)); /* don't leak any kernel bits to user-level */
552
553 if (unw_unwind_to_user(info) < 0)
554 return;
555
556 unw_get_sp(info, &sp);
557 pt = (struct pt_regs *) (sp + 16);
558
559 urbs_end = ia64_get_user_rbs_end(task, pt, &cfm);
560
561 if (ia64_sync_user_rbs(task, info->sw, pt->ar_bspstore, urbs_end) < 0)
562 return;
563
564 ia64_peek(task, info->sw, urbs_end, (long) ia64_rse_rnat_addr((long *) urbs_end),
565 &ar_rnat);
566
567 /*
568 * coredump format:
569 * r0-r31
570 * NaT bits (for r0-r31; bit N == 1 iff rN is a NaT)
571 * predicate registers (p0-p63)
572 * b0-b7
573 * ip cfm user-mask
574 * ar.rsc ar.bsp ar.bspstore ar.rnat
575 * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec
576 */
577
578 /* r0 is zero */
579 for (i = 1, mask = (1UL << i); i < 32; ++i) {
580 unw_get_gr(info, i, &dst[i], &nat);
581 if (nat)
582 nat_bits |= mask;
583 mask <<= 1;
584 }
585 dst[32] = nat_bits;
586 unw_get_pr(info, &dst[33]);
587
588 for (i = 0; i < 8; ++i)
589 unw_get_br(info, i, &dst[34 + i]);
590
591 unw_get_rp(info, &ip);
592 dst[42] = ip + ia64_psr(pt)->ri;
593 dst[43] = cfm;
594 dst[44] = pt->cr_ipsr & IA64_PSR_UM;
595
596 unw_get_ar(info, UNW_AR_RSC, &dst[45]);
597 /*
598 * For bsp and bspstore, unw_get_ar() would return the kernel
599 * addresses, but we need the user-level addresses instead:
600 */
601 dst[46] = urbs_end; /* note: by convention PT_AR_BSP points to the end of the urbs! */
602 dst[47] = pt->ar_bspstore;
603 dst[48] = ar_rnat;
604 unw_get_ar(info, UNW_AR_CCV, &dst[49]);
605 unw_get_ar(info, UNW_AR_UNAT, &dst[50]);
606 unw_get_ar(info, UNW_AR_FPSR, &dst[51]);
607 dst[52] = pt->ar_pfs; /* UNW_AR_PFS is == to pt->cr_ifs for interrupt frames */
608 unw_get_ar(info, UNW_AR_LC, &dst[53]);
609 unw_get_ar(info, UNW_AR_EC, &dst[54]);
610 unw_get_ar(info, UNW_AR_CSD, &dst[55]);
611 unw_get_ar(info, UNW_AR_SSD, &dst[56]);
612}
613
614void
615do_dump_task_fpu (struct task_struct *task, struct unw_frame_info *info, void *arg)
616{
617 elf_fpreg_t *dst = arg;
618 int i;
619
620 memset(dst, 0, sizeof(elf_fpregset_t)); /* don't leak any "random" bits */
621
622 if (unw_unwind_to_user(info) < 0)
623 return;
624
625 /* f0 is 0.0, f1 is 1.0 */
626
627 for (i = 2; i < 32; ++i)
628 unw_get_fr(info, i, dst + i);
629
630 ia64_flush_fph(task);
631 if ((task->thread.flags & IA64_THREAD_FPH_VALID) != 0)
632 memcpy(dst + 32, task->thread.fph, 96*16);
633}
634
635void
636do_copy_regs (struct unw_frame_info *info, void *arg)
637{
638 do_copy_task_regs(current, info, arg);
639}
640
641void
642do_dump_fpu (struct unw_frame_info *info, void *arg)
643{
644 do_dump_task_fpu(current, info, arg);
645}
646
1da177e4
LT
647void
648ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst)
649{
650 unw_init_running(do_copy_regs, dst);
651}
652
1da177e4
LT
653int
654dump_fpu (struct pt_regs *pt, elf_fpregset_t dst)
655{
656 unw_init_running(do_dump_fpu, dst);
657 return 1; /* f0-f31 are always valid so we always return 1 */
658}
659
660long
661sys_execve (char __user *filename, char __user * __user *argv, char __user * __user *envp,
662 struct pt_regs *regs)
663{
664 char *fname;
665 int error;
666
667 fname = getname(filename);
668 error = PTR_ERR(fname);
669 if (IS_ERR(fname))
670 goto out;
671 error = do_execve(fname, argv, envp, regs);
672 putname(fname);
673out:
674 return error;
675}
676
677pid_t
678kernel_thread (int (*fn)(void *), void *arg, unsigned long flags)
679{
680 extern void start_kernel_thread (void);
681 unsigned long *helper_fptr = (unsigned long *) &start_kernel_thread;
682 struct {
683 struct switch_stack sw;
684 struct pt_regs pt;
685 } regs;
686
687 memset(&regs, 0, sizeof(regs));
688 regs.pt.cr_iip = helper_fptr[0]; /* set entry point (IP) */
689 regs.pt.r1 = helper_fptr[1]; /* set GP */
690 regs.pt.r9 = (unsigned long) fn; /* 1st argument */
691 regs.pt.r11 = (unsigned long) arg; /* 2nd argument */
692 /* Preserve PSR bits, except for bits 32-34 and 37-45, which we can't read. */
693 regs.pt.cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN;
694 regs.pt.cr_ifs = 1UL << 63; /* mark as valid, empty frame */
695 regs.sw.ar_fpsr = regs.pt.ar_fpsr = ia64_getreg(_IA64_REG_AR_FPSR);
696 regs.sw.ar_bspstore = (unsigned long) current + IA64_RBS_OFFSET;
697 regs.sw.pr = (1 << PRED_KERNEL_STACK);
698 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs.pt, 0, NULL, NULL);
699}
700EXPORT_SYMBOL(kernel_thread);
701
702/* This gets called from kernel_thread() via ia64_invoke_thread_helper(). */
703int
704kernel_thread_helper (int (*fn)(void *), void *arg)
705{
706#ifdef CONFIG_IA32_SUPPORT
6450578f 707 if (IS_IA32_PROCESS(task_pt_regs(current))) {
1da177e4
LT
708 /* A kernel thread is always a 64-bit process. */
709 current->thread.map_base = DEFAULT_MAP_BASE;
710 current->thread.task_size = DEFAULT_TASK_SIZE;
711 ia64_set_kr(IA64_KR_IO_BASE, current->thread.old_iob);
712 ia64_set_kr(IA64_KR_TSSD, current->thread.old_k1);
713 }
714#endif
715 return (*fn)(arg);
716}
717
718/*
719 * Flush thread state. This is called when a thread does an execve().
720 */
721void
722flush_thread (void)
723{
724 /* drop floating-point and debug-register state if it exists: */
725 current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID);
726 ia64_drop_fpu(current);
27af4cfd 727#ifdef CONFIG_IA32_SUPPORT
6450578f 728 if (IS_IA32_PROCESS(task_pt_regs(current))) {
3b74d18e 729 ia32_drop_ia64_partial_page_list(current);
bd1d6e24
RH
730 current->thread.task_size = IA32_PAGE_OFFSET;
731 set_fs(USER_DS);
e384f414 732 memset(current->thread.tls_array, 0, sizeof(current->thread.tls_array));
bd1d6e24 733 }
27af4cfd 734#endif
1da177e4
LT
735}
736
737/*
738 * Clean up state associated with current thread. This is called when
739 * the thread calls exit().
740 */
741void
742exit_thread (void)
743{
9508dbfe 744
1da177e4
LT
745 ia64_drop_fpu(current);
746#ifdef CONFIG_PERFMON
747 /* if needed, stop monitoring and flush state to perfmon context */
748 if (current->thread.pfm_context)
749 pfm_exit_thread(current);
750
751 /* free debug register resources */
752 if (current->thread.flags & IA64_THREAD_DBG_VALID)
753 pfm_release_debug_registers(current);
754#endif
6450578f 755 if (IS_IA32_PROCESS(task_pt_regs(current)))
3b74d18e 756 ia32_drop_ia64_partial_page_list(current);
1da177e4
LT
757}
758
759unsigned long
760get_wchan (struct task_struct *p)
761{
762 struct unw_frame_info info;
763 unsigned long ip;
764 int count = 0;
765
6ae38488
RH
766 if (!p || p == current || p->state == TASK_RUNNING)
767 return 0;
768
1da177e4
LT
769 /*
770 * Note: p may not be a blocked task (it could be current or
771 * another process running on some other CPU. Rather than
772 * trying to determine if p is really blocked, we just assume
773 * it's blocked and rely on the unwind routines to fail
774 * gracefully if the process wasn't really blocked after all.
775 * --davidm 99/12/15
776 */
777 unw_init_from_blocked_task(&info, p);
778 do {
6ae38488
RH
779 if (p->state == TASK_RUNNING)
780 return 0;
1da177e4
LT
781 if (unw_unwind(&info) < 0)
782 return 0;
783 unw_get_ip(&info, &ip);
784 if (!in_sched_functions(ip))
785 return ip;
786 } while (count++ < 16);
787 return 0;
788}
789
790void
791cpu_halt (void)
792{
793 pal_power_mgmt_info_u_t power_info[8];
794 unsigned long min_power;
795 int i, min_power_state;
796
797 if (ia64_pal_halt_info(power_info) != 0)
798 return;
799
800 min_power_state = 0;
801 min_power = power_info[0].pal_power_mgmt_info_s.power_consumption;
802 for (i = 1; i < 8; ++i)
803 if (power_info[i].pal_power_mgmt_info_s.im
804 && power_info[i].pal_power_mgmt_info_s.power_consumption < min_power) {
805 min_power = power_info[i].pal_power_mgmt_info_s.power_consumption;
806 min_power_state = i;
807 }
808
809 while (1)
810 ia64_pal_halt(min_power_state);
811}
812
c237508a
H
813void machine_shutdown(void)
814{
815#ifdef CONFIG_HOTPLUG_CPU
816 int cpu;
817
818 for_each_online_cpu(cpu) {
819 if (cpu != smp_processor_id())
820 cpu_down(cpu);
821 }
822#endif
823#ifdef CONFIG_KEXEC
824 kexec_disable_iosapic();
825#endif
826}
827
1da177e4
LT
828void
829machine_restart (char *restart_cmd)
830{
9138d581 831 (void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0);
1da177e4
LT
832 (*efi.reset_system)(EFI_RESET_WARM, 0, 0, NULL);
833}
834
1da177e4
LT
835void
836machine_halt (void)
837{
9138d581 838 (void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0);
1da177e4
LT
839 cpu_halt();
840}
841
1da177e4
LT
842void
843machine_power_off (void)
844{
845 if (pm_power_off)
846 pm_power_off();
847 machine_halt();
848}
849