blob: 31360cbbd5f8951e7f816aba3b47efea9380302b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Architecture-specific setup.
3 *
4 * Copyright (C) 1998-2003 Hewlett-Packard Co
5 * David Mosberger-Tang <davidm@hpl.hp.com>
Ashok Rajb8d8b882005-04-22 14:44:40 -07006 * 04/11/17 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support
Keith Owens9138d582005-11-07 11:27:13 -08007 *
8 * 2005-10-07 Keith Owens <kaos@sgi.com>
9 * Add notify_die() hooks.
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/module.h>
20#include <linux/notifier.h>
21#include <linux/personality.h>
22#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#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>
Christoph Hellwig1eeb66a2007-05-08 00:27:03 -070029#include <linux/kdebug.h>
Luck, Tonyee211b32007-12-18 11:46:38 -080030#include <linux/utsname.h>
Shaohua Lif14488c2008-10-06 10:43:06 -070031#include <linux/tracehook.h>
Paul E. McKenney93482f42012-08-24 13:22:13 -070032#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#include <asm/cpu.h>
35#include <asm/delay.h>
36#include <asm/elf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <asm/irq.h>
Hormsc2375082007-02-05 13:49:10 -080038#include <asm/kexec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <asm/pgalloc.h>
40#include <asm/processor.h>
41#include <asm/sal.h>
Luck, Tony93f37882012-03-29 13:35:22 -070042#include <asm/switch_to.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <asm/tlbflush.h>
44#include <asm/uaccess.h>
45#include <asm/unwind.h>
46#include <asm/user.h>
47
48#include "entry.h"
49
50#ifdef CONFIG_PERFMON
51# include <asm/perfmon.h>
52#endif
53
54#include "sigframe.h"
55
56void (*ia64_mark_idle)(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Thomas Renningerd1896042010-11-03 17:06:14 +010058unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059EXPORT_SYMBOL(boot_option_idle_override);
Alex Chiangd8680802010-02-25 14:09:52 -070060void (*pm_idle) (void);
61EXPORT_SYMBOL(pm_idle);
62void (*pm_power_off) (void);
63EXPORT_SYMBOL(pm_power_off);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65void
66ia64_do_show_stack (struct unw_frame_info *info, void *arg)
67{
68 unsigned long ip, sp, bsp;
69 char buf[128]; /* don't make it so big that it overflows the stack! */
70
71 printk("\nCall Trace:\n");
72 do {
73 unw_get_ip(info, &ip);
74 if (ip == 0)
75 break;
76
77 unw_get_sp(info, &sp);
78 unw_get_bsp(info, &bsp);
79 snprintf(buf, sizeof(buf),
80 " [<%016lx>] %%s\n"
81 " sp=%016lx bsp=%016lx\n",
82 ip, sp, bsp);
83 print_symbol(buf, ip);
84 } while (unw_unwind(info) >= 0);
85}
86
87void
88show_stack (struct task_struct *task, unsigned long *sp)
89{
90 if (!task)
91 unw_init_running(ia64_do_show_stack, NULL);
92 else {
93 struct unw_frame_info info;
94
95 unw_init_from_blocked_task(&info, task);
96 ia64_do_show_stack(&info, NULL);
97 }
98}
99
100void
101dump_stack (void)
102{
103 show_stack(NULL, NULL);
104}
105
106EXPORT_SYMBOL(dump_stack);
107
108void
109show_regs (struct pt_regs *regs)
110{
111 unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri;
112
113 print_modules();
Alexey Dobriyan19c58702007-10-18 23:40:41 -0700114 printk("\nPid: %d, CPU %d, comm: %20s\n", task_pid_nr(current),
115 smp_processor_id(), current->comm);
Luck, Tonyee211b32007-12-18 11:46:38 -0800116 printk("psr : %016lx ifs : %016lx ip : [<%016lx>] %s (%s)\n",
117 regs->cr_ipsr, regs->cr_ifs, ip, print_tainted(),
118 init_utsname()->release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 print_symbol("ip is at %s\n", ip);
120 printk("unat: %016lx pfs : %016lx rsc : %016lx\n",
121 regs->ar_unat, regs->ar_pfs, regs->ar_rsc);
122 printk("rnat: %016lx bsps: %016lx pr : %016lx\n",
123 regs->ar_rnat, regs->ar_bspstore, regs->pr);
124 printk("ldrs: %016lx ccv : %016lx fpsr: %016lx\n",
125 regs->loadrs, regs->ar_ccv, regs->ar_fpsr);
126 printk("csd : %016lx ssd : %016lx\n", regs->ar_csd, regs->ar_ssd);
127 printk("b0 : %016lx b6 : %016lx b7 : %016lx\n", regs->b0, regs->b6, regs->b7);
128 printk("f6 : %05lx%016lx f7 : %05lx%016lx\n",
129 regs->f6.u.bits[1], regs->f6.u.bits[0],
130 regs->f7.u.bits[1], regs->f7.u.bits[0]);
131 printk("f8 : %05lx%016lx f9 : %05lx%016lx\n",
132 regs->f8.u.bits[1], regs->f8.u.bits[0],
133 regs->f9.u.bits[1], regs->f9.u.bits[0]);
134 printk("f10 : %05lx%016lx f11 : %05lx%016lx\n",
135 regs->f10.u.bits[1], regs->f10.u.bits[0],
136 regs->f11.u.bits[1], regs->f11.u.bits[0]);
137
138 printk("r1 : %016lx r2 : %016lx r3 : %016lx\n", regs->r1, regs->r2, regs->r3);
139 printk("r8 : %016lx r9 : %016lx r10 : %016lx\n", regs->r8, regs->r9, regs->r10);
140 printk("r11 : %016lx r12 : %016lx r13 : %016lx\n", regs->r11, regs->r12, regs->r13);
141 printk("r14 : %016lx r15 : %016lx r16 : %016lx\n", regs->r14, regs->r15, regs->r16);
142 printk("r17 : %016lx r18 : %016lx r19 : %016lx\n", regs->r17, regs->r18, regs->r19);
143 printk("r20 : %016lx r21 : %016lx r22 : %016lx\n", regs->r20, regs->r21, regs->r22);
144 printk("r23 : %016lx r24 : %016lx r25 : %016lx\n", regs->r23, regs->r24, regs->r25);
145 printk("r26 : %016lx r27 : %016lx r28 : %016lx\n", regs->r26, regs->r27, regs->r28);
146 printk("r29 : %016lx r30 : %016lx r31 : %016lx\n", regs->r29, regs->r30, regs->r31);
147
148 if (user_mode(regs)) {
149 /* print the stacked registers */
150 unsigned long val, *bsp, ndirty;
151 int i, sof, is_nat = 0;
152
153 sof = regs->cr_ifs & 0x7f; /* size of frame */
154 ndirty = (regs->loadrs >> 19);
155 bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty);
156 for (i = 0; i < sof; ++i) {
157 get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i));
158 printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val,
159 ((i == sof - 1) || (i % 3) == 2) ? "\n" : " ");
160 }
161 } else
162 show_stack(NULL, NULL);
163}
164
Anirban Sinha353f6dd2009-09-14 11:13:37 -0700165/* local support for deprecated console_print */
166void
167console_print(const char *s)
168{
169 printk(KERN_EMERG "%s", s);
170}
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172void
Hidetoshi Seto3633c732008-05-09 15:26:35 +0900173do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
175 if (fsys_mode(current, &scr->pt)) {
Hidetoshi Seto3633c732008-05-09 15:26:35 +0900176 /*
177 * defer signal-handling etc. until we return to
178 * privilege-level 0.
179 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 if (!ia64_psr(&scr->pt)->lp)
181 ia64_psr(&scr->pt)->lp = 1;
182 return;
183 }
184
185#ifdef CONFIG_PERFMON
186 if (current->thread.pfm_needs_checking)
Hidetoshi Seto3633c732008-05-09 15:26:35 +0900187 /*
188 * Note: pfm_handle_work() allow us to call it with interrupts
189 * disabled, and may enable interrupts within the function.
190 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 pfm_handle_work();
192#endif
193
194 /* deal with pending signal delivery */
Hidetoshi Seto3633c732008-05-09 15:26:35 +0900195 if (test_thread_flag(TIF_SIGPENDING)) {
196 local_irq_enable(); /* force interrupt enable */
Alexey Dobriyan4a177cb2007-01-23 19:03:17 +0300197 ia64_do_signal(scr, in_syscall);
Hidetoshi Seto3633c732008-05-09 15:26:35 +0900198 }
Petr Tesarik3b2ce0b2007-12-12 15:23:34 +0100199
Tony Luck09672372012-09-20 11:47:13 -0700200 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) {
201 local_irq_enable(); /* force interrupt enable */
Shaohua Lif14488c2008-10-06 10:43:06 -0700202 tracehook_notify_resume(&scr->pt);
203 }
204
Petr Tesarik3b2ce0b2007-12-12 15:23:34 +0100205 /* copy user rbs to kernel rbs */
Hidetoshi Seto3633c732008-05-09 15:26:35 +0900206 if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) {
207 local_irq_enable(); /* force interrupt enable */
Petr Tesarik3b2ce0b2007-12-12 15:23:34 +0100208 ia64_sync_krbs();
Hidetoshi Seto3633c732008-05-09 15:26:35 +0900209 }
210
211 local_irq_disable(); /* force interrupt disable */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212}
213
Stephane Eranian8df5a502005-04-11 13:45:00 -0700214static int pal_halt = 1;
215static int can_do_pal_halt = 1;
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217static int __init nohalt_setup(char * str)
218{
Ken Chenfb573852005-08-08 15:25:00 -0700219 pal_halt = can_do_pal_halt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 return 1;
221}
222__setup("nohalt", nohalt_setup);
223
Tony Lucka71f62e2005-05-03 16:21:45 -0700224void
Stephane Eranian8df5a502005-04-11 13:45:00 -0700225update_pal_halt_status(int status)
226{
227 can_do_pal_halt = pal_halt && status;
228}
229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230/*
231 * We use this if we don't have any better idle routine..
232 */
233void
234default_idle (void)
235{
Venkatesh Pallipadi6c4fa562005-04-18 23:06:47 -0400236 local_irq_enable();
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800237 while (!need_resched()) {
Dimitri Sivanich71416be2007-08-07 08:49:32 -0500238 if (can_do_pal_halt) {
239 local_irq_disable();
240 if (!need_resched()) {
241 safe_halt();
242 }
243 local_irq_enable();
244 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 cpu_relax();
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800246 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247}
248
249#ifdef CONFIG_HOTPLUG_CPU
250/* We don't actually take CPU down, just spin without interrupts. */
251static inline void play_dead(void)
252{
Ashok Rajb8d8b882005-04-22 14:44:40 -0700253 unsigned int this_cpu = smp_processor_id();
254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 /* Ack it */
256 __get_cpu_var(cpu_state) = CPU_DEAD;
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 max_xtp();
259 local_irq_disable();
Ashok Rajb8d8b882005-04-22 14:44:40 -0700260 idle_task_exit();
261 ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 /*
Ashok Rajb8d8b882005-04-22 14:44:40 -0700263 * The above is a point of no-return, the processor is
264 * expected to be in SAL loop now.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 */
Ashok Rajb8d8b882005-04-22 14:44:40 -0700266 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267}
268#else
269static inline void play_dead(void)
270{
271 BUG();
272}
273#endif /* CONFIG_HOTPLUG_CPU */
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275void __attribute__((noreturn))
276cpu_idle (void)
277{
278 void (*mark_idle)(int) = ia64_mark_idle;
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800279 int cpu = smp_processor_id();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281 /* endless idle loop with no priority at all */
282 while (1) {
Paul E. McKenney93482f42012-08-24 13:22:13 -0700283 rcu_idle_enter();
Ingo Molnar0888f062006-12-22 01:11:56 -0800284 if (can_do_pal_halt) {
Andi Kleen495ab9c2006-06-26 13:59:11 +0200285 current_thread_info()->status &= ~TS_POLLING;
Ingo Molnar0888f062006-12-22 01:11:56 -0800286 /*
287 * TS_POLLING-cleared state must be visible before we
288 * test NEED_RESCHED:
289 */
290 smp_mb();
291 } else {
Andi Kleen495ab9c2006-06-26 13:59:11 +0200292 current_thread_info()->status |= TS_POLLING;
Ingo Molnar0888f062006-12-22 01:11:56 -0800293 }
Chen, Kenneth W1e185b92005-11-15 14:37:05 -0800294
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800295 if (!need_resched()) {
296 void (*idle)(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297#ifdef CONFIG_SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 min_xtp();
299#endif
Zwane Mwaikambo7d5f9c02005-03-30 21:40:00 -0700300 rmb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 if (mark_idle)
302 (*mark_idle)(1);
303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 idle = pm_idle;
305 if (!idle)
306 idle = default_idle;
307 (*idle)();
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800308 if (mark_idle)
309 (*mark_idle)(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310#ifdef CONFIG_SMP
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800311 normal_xtp();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312#endif
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800313 }
Paul E. McKenney93482f42012-08-24 13:22:13 -0700314 rcu_idle_exit();
Thomas Gleixnerbd2f5532011-03-21 12:33:18 +0100315 schedule_preempt_disabled();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 check_pgt_cache();
Nick Piggin64c7c8f2005-11-08 21:39:04 -0800317 if (cpu_is_offline(cpu))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 play_dead();
319 }
320}
321
322void
323ia64_save_extra (struct task_struct *task)
324{
325#ifdef CONFIG_PERFMON
326 unsigned long info;
327#endif
328
329 if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
330 ia64_save_debug_regs(&task->thread.dbr[0]);
331
332#ifdef CONFIG_PERFMON
333 if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0)
334 pfm_save_regs(task);
335
336 info = __get_cpu_var(pfm_syst_info);
337 if (info & PFM_CPUINFO_SYST_WIDE)
338 pfm_syst_wide_update_task(task, info, 0);
339#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340}
341
342void
343ia64_load_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_load_debug_regs(&task->thread.dbr[0]);
351
352#ifdef CONFIG_PERFMON
353 if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0)
354 pfm_load_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, 1);
359#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360}
361
362/*
363 * Copy the state of an ia-64 thread.
364 *
365 * We get here through the following call chain:
366 *
367 * from user-level: from kernel:
368 *
369 * <clone syscall> <some kernel call frames>
370 * sys_clone :
371 * do_fork do_fork
372 * copy_thread copy_thread
373 *
374 * This means that the stack layout is as follows:
375 *
376 * +---------------------+ (highest addr)
377 * | struct pt_regs |
378 * +---------------------+
379 * | struct switch_stack |
380 * +---------------------+
381 * | |
382 * | memory stack |
383 * | | <-- sp (lowest addr)
384 * +---------------------+
385 *
386 * Observe that we copy the unat values that are in pt_regs and switch_stack. Spilling an
387 * integer to address X causes bit N in ar.unat to be set to the NaT bit of the register,
388 * with N=(X & 0x1ff)/8. Thus, copying the unat value preserves the NaT bits ONLY if the
389 * pt_regs structure in the parent is congruent to that of the child, modulo 512. Since
390 * the stack is page aligned and the page size is at least 4KB, this is always the case,
391 * so there is nothing to worry about.
392 */
393int
Alexey Dobriyan6f2c55b2009-04-02 16:56:59 -0700394copy_thread(unsigned long clone_flags,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 unsigned long user_stack_base, unsigned long user_stack_size,
Al Viroafa86fc2012-10-22 22:51:14 -0400396 struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397{
Tony Luck32974ad2010-02-08 10:42:17 -0800398 extern char ia64_ret_from_clone;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 struct switch_stack *child_stack, *stack;
400 unsigned long rbs, child_rbs, rbs_size;
401 struct pt_regs *child_ptregs;
Al Viroafa86fc2012-10-22 22:51:14 -0400402 struct pt_regs *regs = current_pt_regs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 int retval = 0;
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1;
406 child_stack = (struct switch_stack *) child_ptregs - 1;
407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 rbs = (unsigned long) current + IA64_RBS_OFFSET;
409 child_rbs = (unsigned long) p + IA64_RBS_OFFSET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 /* copy parts of thread_struct: */
412 p->thread.ksp = (unsigned long) child_stack - 16;
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 /*
415 * NOTE: The calling convention considers all floating point
416 * registers in the high partition (fph) to be scratch. Since
417 * the only way to get to this point is through a system call,
418 * we know that the values in fph are all dead. Hence, there
419 * is no need to inherit the fph state from the parent to the
420 * child and all we have to do is to make sure that
421 * IA64_THREAD_FPH_VALID is cleared in the child.
422 *
423 * XXX We could push this optimization a bit further by
424 * clearing IA64_THREAD_FPH_VALID on ANY system call.
425 * However, it's not clear this is worth doing. Also, it
426 * would be a slight deviation from the normal Linux system
427 * call behavior where scratch registers are preserved across
428 * system calls (unless used by the system call itself).
429 */
430# define THREAD_FLAGS_TO_CLEAR (IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID \
431 | IA64_THREAD_PM_VALID)
432# define THREAD_FLAGS_TO_SET 0
433 p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR)
434 | THREAD_FLAGS_TO_SET);
Al Viro54d496c2012-10-14 15:43:06 -0400435
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Al Viro54d496c2012-10-14 15:43:06 -0400438 if (unlikely(p->flags & PF_KTHREAD)) {
439 if (unlikely(!user_stack_base)) {
440 /* fork_idle() called us */
441 return 0;
442 }
443 memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack));
444 child_stack->r4 = user_stack_base; /* payload */
445 child_stack->r5 = user_stack_size; /* argument */
446 /*
447 * Preserve PSR bits, except for bits 32-34 and 37-45,
448 * which we can't read.
449 */
450 child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN;
451 /* mark as valid, empty frame */
452 child_ptregs->cr_ifs = 1UL << 63;
453 child_stack->ar_fpsr = child_ptregs->ar_fpsr
454 = ia64_getreg(_IA64_REG_AR_FPSR);
455 child_stack->pr = (1 << PRED_KERNEL_STACK);
456 child_stack->ar_bspstore = child_rbs;
457 child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
458
459 /* stop some PSR bits from being inherited.
460 * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
461 * therefore we must specify them explicitly here and not include them in
462 * IA64_PSR_BITS_TO_CLEAR.
463 */
464 child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
465 & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
466
467 return 0;
468 }
469 stack = ((struct switch_stack *) regs) - 1;
470 /* copy parent's switch_stack & pt_regs to child: */
471 memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack));
472
473 /* copy the parent's register backing store to the child: */
474 rbs_size = stack->ar_bspstore - rbs;
475 memcpy((void *) child_rbs, (void *) rbs, rbs_size);
476 if (clone_flags & CLONE_SETTLS)
477 child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */
478 if (user_stack_base) {
479 child_ptregs->r12 = user_stack_base + user_stack_size - 16;
480 child_ptregs->ar_bspstore = user_stack_base;
481 child_ptregs->ar_rnat = 0;
482 child_ptregs->loadrs = 0;
483 }
484 child_stack->ar_bspstore = child_rbs + rbs_size;
485 child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495#ifdef CONFIG_PERFMON
496 if (current->thread.pfm_context)
497 pfm_inherit(p, child_ptregs);
498#endif
499 return retval;
500}
501
502static void
503do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg)
504{
Jes Sorensen256a7e02007-07-11 17:26:30 +0200505 unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm;
506 unsigned long uninitialized_var(ip); /* GCC be quiet */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 elf_greg_t *dst = arg;
508 struct pt_regs *pt;
509 char nat;
510 int i;
511
512 memset(dst, 0, sizeof(elf_gregset_t)); /* don't leak any kernel bits to user-level */
513
514 if (unw_unwind_to_user(info) < 0)
515 return;
516
517 unw_get_sp(info, &sp);
518 pt = (struct pt_regs *) (sp + 16);
519
520 urbs_end = ia64_get_user_rbs_end(task, pt, &cfm);
521
522 if (ia64_sync_user_rbs(task, info->sw, pt->ar_bspstore, urbs_end) < 0)
523 return;
524
525 ia64_peek(task, info->sw, urbs_end, (long) ia64_rse_rnat_addr((long *) urbs_end),
526 &ar_rnat);
527
528 /*
529 * coredump format:
530 * r0-r31
531 * NaT bits (for r0-r31; bit N == 1 iff rN is a NaT)
532 * predicate registers (p0-p63)
533 * b0-b7
534 * ip cfm user-mask
535 * ar.rsc ar.bsp ar.bspstore ar.rnat
536 * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec
537 */
538
539 /* r0 is zero */
540 for (i = 1, mask = (1UL << i); i < 32; ++i) {
541 unw_get_gr(info, i, &dst[i], &nat);
542 if (nat)
543 nat_bits |= mask;
544 mask <<= 1;
545 }
546 dst[32] = nat_bits;
547 unw_get_pr(info, &dst[33]);
548
549 for (i = 0; i < 8; ++i)
550 unw_get_br(info, i, &dst[34 + i]);
551
552 unw_get_rp(info, &ip);
553 dst[42] = ip + ia64_psr(pt)->ri;
554 dst[43] = cfm;
555 dst[44] = pt->cr_ipsr & IA64_PSR_UM;
556
557 unw_get_ar(info, UNW_AR_RSC, &dst[45]);
558 /*
559 * For bsp and bspstore, unw_get_ar() would return the kernel
560 * addresses, but we need the user-level addresses instead:
561 */
562 dst[46] = urbs_end; /* note: by convention PT_AR_BSP points to the end of the urbs! */
563 dst[47] = pt->ar_bspstore;
564 dst[48] = ar_rnat;
565 unw_get_ar(info, UNW_AR_CCV, &dst[49]);
566 unw_get_ar(info, UNW_AR_UNAT, &dst[50]);
567 unw_get_ar(info, UNW_AR_FPSR, &dst[51]);
568 dst[52] = pt->ar_pfs; /* UNW_AR_PFS is == to pt->cr_ifs for interrupt frames */
569 unw_get_ar(info, UNW_AR_LC, &dst[53]);
570 unw_get_ar(info, UNW_AR_EC, &dst[54]);
571 unw_get_ar(info, UNW_AR_CSD, &dst[55]);
572 unw_get_ar(info, UNW_AR_SSD, &dst[56]);
573}
574
575void
576do_dump_task_fpu (struct task_struct *task, struct unw_frame_info *info, void *arg)
577{
578 elf_fpreg_t *dst = arg;
579 int i;
580
581 memset(dst, 0, sizeof(elf_fpregset_t)); /* don't leak any "random" bits */
582
583 if (unw_unwind_to_user(info) < 0)
584 return;
585
586 /* f0 is 0.0, f1 is 1.0 */
587
588 for (i = 2; i < 32; ++i)
589 unw_get_fr(info, i, dst + i);
590
591 ia64_flush_fph(task);
592 if ((task->thread.flags & IA64_THREAD_FPH_VALID) != 0)
593 memcpy(dst + 32, task->thread.fph, 96*16);
594}
595
596void
597do_copy_regs (struct unw_frame_info *info, void *arg)
598{
599 do_copy_task_regs(current, info, arg);
600}
601
602void
603do_dump_fpu (struct unw_frame_info *info, void *arg)
604{
605 do_dump_task_fpu(current, info, arg);
606}
607
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608void
609ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst)
610{
611 unw_init_running(do_copy_regs, dst);
612}
613
614int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615dump_fpu (struct pt_regs *pt, elf_fpregset_t dst)
616{
617 unw_init_running(do_dump_fpu, dst);
618 return 1; /* f0-f31 are always valid so we always return 1 */
619}
620
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621/*
622 * Flush thread state. This is called when a thread does an execve().
623 */
624void
625flush_thread (void)
626{
627 /* drop floating-point and debug-register state if it exists: */
628 current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID);
629 ia64_drop_fpu(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630}
631
632/*
633 * Clean up state associated with current thread. This is called when
634 * the thread calls exit().
635 */
636void
637exit_thread (void)
638{
Rusty Lynch9508dbf2005-06-27 15:17:12 -0700639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 ia64_drop_fpu(current);
641#ifdef CONFIG_PERFMON
642 /* if needed, stop monitoring and flush state to perfmon context */
643 if (current->thread.pfm_context)
644 pfm_exit_thread(current);
645
646 /* free debug register resources */
647 if (current->thread.flags & IA64_THREAD_DBG_VALID)
648 pfm_release_debug_registers(current);
649#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650}
651
652unsigned long
653get_wchan (struct task_struct *p)
654{
655 struct unw_frame_info info;
656 unsigned long ip;
657 int count = 0;
658
Robin Holt6ae38482007-05-18 13:46:52 -0500659 if (!p || p == current || p->state == TASK_RUNNING)
660 return 0;
661
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 /*
663 * Note: p may not be a blocked task (it could be current or
664 * another process running on some other CPU. Rather than
665 * trying to determine if p is really blocked, we just assume
666 * it's blocked and rely on the unwind routines to fail
667 * gracefully if the process wasn't really blocked after all.
668 * --davidm 99/12/15
669 */
670 unw_init_from_blocked_task(&info, p);
671 do {
Robin Holt6ae38482007-05-18 13:46:52 -0500672 if (p->state == TASK_RUNNING)
673 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 if (unw_unwind(&info) < 0)
675 return 0;
676 unw_get_ip(&info, &ip);
677 if (!in_sched_functions(ip))
678 return ip;
679 } while (count++ < 16);
680 return 0;
681}
682
683void
684cpu_halt (void)
685{
686 pal_power_mgmt_info_u_t power_info[8];
687 unsigned long min_power;
688 int i, min_power_state;
689
690 if (ia64_pal_halt_info(power_info) != 0)
691 return;
692
693 min_power_state = 0;
694 min_power = power_info[0].pal_power_mgmt_info_s.power_consumption;
695 for (i = 1; i < 8; ++i)
696 if (power_info[i].pal_power_mgmt_info_s.im
697 && power_info[i].pal_power_mgmt_info_s.power_consumption < min_power) {
698 min_power = power_info[i].pal_power_mgmt_info_s.power_consumption;
699 min_power_state = i;
700 }
701
702 while (1)
703 ia64_pal_halt(min_power_state);
704}
705
Hormsc2375082007-02-05 13:49:10 -0800706void machine_shutdown(void)
707{
708#ifdef CONFIG_HOTPLUG_CPU
709 int cpu;
710
711 for_each_online_cpu(cpu) {
712 if (cpu != smp_processor_id())
713 cpu_down(cpu);
714 }
715#endif
716#ifdef CONFIG_KEXEC
717 kexec_disable_iosapic();
718#endif
719}
720
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721void
722machine_restart (char *restart_cmd)
723{
Keith Owens9138d582005-11-07 11:27:13 -0800724 (void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 (*efi.reset_system)(EFI_RESET_WARM, 0, 0, NULL);
726}
727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728void
729machine_halt (void)
730{
Keith Owens9138d582005-11-07 11:27:13 -0800731 (void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 cpu_halt();
733}
734
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735void
736machine_power_off (void)
737{
738 if (pm_power_off)
739 pm_power_off();
740 machine_halt();
741}
742