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Commit | Line | Data |
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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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/notifier.h> | |
21 | #include <linux/personality.h> | |
22 | #include <linux/sched.h> | |
b17b0153 | 23 | #include <linux/sched/debug.h> |
ef8bd77f | 24 | #include <linux/sched/hotplug.h> |
29930025 | 25 | #include <linux/sched/task.h> |
1da177e4 LT |
26 | #include <linux/stddef.h> |
27 | #include <linux/thread_info.h> | |
28 | #include <linux/unistd.h> | |
29 | #include <linux/efi.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/delay.h> | |
1eeb66a1 | 32 | #include <linux/kdebug.h> |
ee211b37 | 33 | #include <linux/utsname.h> |
f14488cc | 34 | #include <linux/tracehook.h> |
93482f4e | 35 | #include <linux/rcupdate.h> |
1da177e4 LT |
36 | |
37 | #include <asm/cpu.h> | |
38 | #include <asm/delay.h> | |
39 | #include <asm/elf.h> | |
1da177e4 | 40 | #include <asm/irq.h> |
c237508a | 41 | #include <asm/kexec.h> |
1da177e4 LT |
42 | #include <asm/pgalloc.h> |
43 | #include <asm/processor.h> | |
44 | #include <asm/sal.h> | |
93f37888 | 45 | #include <asm/switch_to.h> |
1da177e4 | 46 | #include <asm/tlbflush.h> |
7c0f6ba6 | 47 | #include <linux/uaccess.h> |
1da177e4 LT |
48 | #include <asm/unwind.h> |
49 | #include <asm/user.h> | |
50 | ||
51 | #include "entry.h" | |
52 | ||
53 | #ifdef CONFIG_PERFMON | |
54 | # include <asm/perfmon.h> | |
55 | #endif | |
56 | ||
57 | #include "sigframe.h" | |
58 | ||
59 | void (*ia64_mark_idle)(int); | |
1da177e4 | 60 | |
d1896049 | 61 | unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE; |
1da177e4 | 62 | EXPORT_SYMBOL(boot_option_idle_override); |
d868080d AC |
63 | void (*pm_power_off) (void); |
64 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 LT |
65 | |
66 | void | |
67 | ia64_do_show_stack (struct unw_frame_info *info, void *arg) | |
68 | { | |
69 | unsigned long ip, sp, bsp; | |
70 | char buf[128]; /* don't make it so big that it overflows the stack! */ | |
71 | ||
72 | printk("\nCall Trace:\n"); | |
73 | do { | |
74 | unw_get_ip(info, &ip); | |
75 | if (ip == 0) | |
76 | break; | |
77 | ||
78 | unw_get_sp(info, &sp); | |
79 | unw_get_bsp(info, &bsp); | |
80 | snprintf(buf, sizeof(buf), | |
81 | " [<%016lx>] %%s\n" | |
82 | " sp=%016lx bsp=%016lx\n", | |
83 | ip, sp, bsp); | |
84 | print_symbol(buf, ip); | |
85 | } while (unw_unwind(info) >= 0); | |
86 | } | |
87 | ||
88 | void | |
89 | show_stack (struct task_struct *task, unsigned long *sp) | |
90 | { | |
91 | if (!task) | |
92 | unw_init_running(ia64_do_show_stack, NULL); | |
93 | else { | |
94 | struct unw_frame_info info; | |
95 | ||
96 | unw_init_from_blocked_task(&info, task); | |
97 | ia64_do_show_stack(&info, NULL); | |
98 | } | |
99 | } | |
100 | ||
1da177e4 LT |
101 | void |
102 | show_regs (struct pt_regs *regs) | |
103 | { | |
104 | unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri; | |
105 | ||
106 | print_modules(); | |
a43cb95d TH |
107 | printk("\n"); |
108 | show_regs_print_info(KERN_DEFAULT); | |
ee211b37 TL |
109 | printk("psr : %016lx ifs : %016lx ip : [<%016lx>] %s (%s)\n", |
110 | regs->cr_ipsr, regs->cr_ifs, ip, print_tainted(), | |
111 | init_utsname()->release); | |
1da177e4 LT |
112 | print_symbol("ip is at %s\n", ip); |
113 | printk("unat: %016lx pfs : %016lx rsc : %016lx\n", | |
114 | regs->ar_unat, regs->ar_pfs, regs->ar_rsc); | |
115 | printk("rnat: %016lx bsps: %016lx pr : %016lx\n", | |
116 | regs->ar_rnat, regs->ar_bspstore, regs->pr); | |
117 | printk("ldrs: %016lx ccv : %016lx fpsr: %016lx\n", | |
118 | regs->loadrs, regs->ar_ccv, regs->ar_fpsr); | |
119 | printk("csd : %016lx ssd : %016lx\n", regs->ar_csd, regs->ar_ssd); | |
120 | printk("b0 : %016lx b6 : %016lx b7 : %016lx\n", regs->b0, regs->b6, regs->b7); | |
121 | printk("f6 : %05lx%016lx f7 : %05lx%016lx\n", | |
122 | regs->f6.u.bits[1], regs->f6.u.bits[0], | |
123 | regs->f7.u.bits[1], regs->f7.u.bits[0]); | |
124 | printk("f8 : %05lx%016lx f9 : %05lx%016lx\n", | |
125 | regs->f8.u.bits[1], regs->f8.u.bits[0], | |
126 | regs->f9.u.bits[1], regs->f9.u.bits[0]); | |
127 | printk("f10 : %05lx%016lx f11 : %05lx%016lx\n", | |
128 | regs->f10.u.bits[1], regs->f10.u.bits[0], | |
129 | regs->f11.u.bits[1], regs->f11.u.bits[0]); | |
130 | ||
131 | printk("r1 : %016lx r2 : %016lx r3 : %016lx\n", regs->r1, regs->r2, regs->r3); | |
132 | printk("r8 : %016lx r9 : %016lx r10 : %016lx\n", regs->r8, regs->r9, regs->r10); | |
133 | printk("r11 : %016lx r12 : %016lx r13 : %016lx\n", regs->r11, regs->r12, regs->r13); | |
134 | printk("r14 : %016lx r15 : %016lx r16 : %016lx\n", regs->r14, regs->r15, regs->r16); | |
135 | printk("r17 : %016lx r18 : %016lx r19 : %016lx\n", regs->r17, regs->r18, regs->r19); | |
136 | printk("r20 : %016lx r21 : %016lx r22 : %016lx\n", regs->r20, regs->r21, regs->r22); | |
137 | printk("r23 : %016lx r24 : %016lx r25 : %016lx\n", regs->r23, regs->r24, regs->r25); | |
138 | printk("r26 : %016lx r27 : %016lx r28 : %016lx\n", regs->r26, regs->r27, regs->r28); | |
139 | printk("r29 : %016lx r30 : %016lx r31 : %016lx\n", regs->r29, regs->r30, regs->r31); | |
140 | ||
141 | if (user_mode(regs)) { | |
142 | /* print the stacked registers */ | |
143 | unsigned long val, *bsp, ndirty; | |
144 | int i, sof, is_nat = 0; | |
145 | ||
146 | sof = regs->cr_ifs & 0x7f; /* size of frame */ | |
147 | ndirty = (regs->loadrs >> 19); | |
148 | bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty); | |
149 | for (i = 0; i < sof; ++i) { | |
150 | get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i)); | |
151 | printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val, | |
152 | ((i == sof - 1) || (i % 3) == 2) ? "\n" : " "); | |
153 | } | |
154 | } else | |
155 | show_stack(NULL, NULL); | |
156 | } | |
157 | ||
353f6dd2 AS |
158 | /* local support for deprecated console_print */ |
159 | void | |
160 | console_print(const char *s) | |
161 | { | |
162 | printk(KERN_EMERG "%s", s); | |
163 | } | |
164 | ||
1da177e4 | 165 | void |
3633c730 | 166 | do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall) |
1da177e4 LT |
167 | { |
168 | if (fsys_mode(current, &scr->pt)) { | |
3633c730 HS |
169 | /* |
170 | * defer signal-handling etc. until we return to | |
171 | * privilege-level 0. | |
172 | */ | |
1da177e4 LT |
173 | if (!ia64_psr(&scr->pt)->lp) |
174 | ia64_psr(&scr->pt)->lp = 1; | |
175 | return; | |
176 | } | |
177 | ||
178 | #ifdef CONFIG_PERFMON | |
179 | if (current->thread.pfm_needs_checking) | |
3633c730 HS |
180 | /* |
181 | * Note: pfm_handle_work() allow us to call it with interrupts | |
182 | * disabled, and may enable interrupts within the function. | |
183 | */ | |
1da177e4 LT |
184 | pfm_handle_work(); |
185 | #endif | |
186 | ||
187 | /* deal with pending signal delivery */ | |
3633c730 HS |
188 | if (test_thread_flag(TIF_SIGPENDING)) { |
189 | local_irq_enable(); /* force interrupt enable */ | |
4a177cbf | 190 | ia64_do_signal(scr, in_syscall); |
3633c730 | 191 | } |
3b2ce0b1 | 192 | |
0967237c TL |
193 | if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) { |
194 | local_irq_enable(); /* force interrupt enable */ | |
f14488cc SL |
195 | tracehook_notify_resume(&scr->pt); |
196 | } | |
197 | ||
3b2ce0b1 | 198 | /* copy user rbs to kernel rbs */ |
3633c730 HS |
199 | if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) { |
200 | local_irq_enable(); /* force interrupt enable */ | |
3b2ce0b1 | 201 | ia64_sync_krbs(); |
3633c730 HS |
202 | } |
203 | ||
204 | local_irq_disable(); /* force interrupt disable */ | |
1da177e4 LT |
205 | } |
206 | ||
1da177e4 LT |
207 | static int __init nohalt_setup(char * str) |
208 | { | |
91d591c3 | 209 | cpu_idle_poll_ctrl(true); |
1da177e4 LT |
210 | return 1; |
211 | } | |
212 | __setup("nohalt", nohalt_setup); | |
213 | ||
1da177e4 LT |
214 | #ifdef CONFIG_HOTPLUG_CPU |
215 | /* We don't actually take CPU down, just spin without interrupts. */ | |
216 | static inline void play_dead(void) | |
217 | { | |
b8d8b883 AR |
218 | unsigned int this_cpu = smp_processor_id(); |
219 | ||
1da177e4 | 220 | /* Ack it */ |
6065a244 | 221 | __this_cpu_write(cpu_state, CPU_DEAD); |
1da177e4 | 222 | |
1da177e4 LT |
223 | max_xtp(); |
224 | local_irq_disable(); | |
b8d8b883 AR |
225 | idle_task_exit(); |
226 | ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]); | |
1da177e4 | 227 | /* |
b8d8b883 AR |
228 | * The above is a point of no-return, the processor is |
229 | * expected to be in SAL loop now. | |
1da177e4 | 230 | */ |
b8d8b883 | 231 | BUG(); |
1da177e4 LT |
232 | } |
233 | #else | |
234 | static inline void play_dead(void) | |
235 | { | |
236 | BUG(); | |
237 | } | |
238 | #endif /* CONFIG_HOTPLUG_CPU */ | |
239 | ||
91d591c3 TG |
240 | void arch_cpu_idle_dead(void) |
241 | { | |
242 | play_dead(); | |
243 | } | |
244 | ||
245 | void arch_cpu_idle(void) | |
1da177e4 LT |
246 | { |
247 | void (*mark_idle)(int) = ia64_mark_idle; | |
1e185b97 | 248 | |
1da177e4 | 249 | #ifdef CONFIG_SMP |
91d591c3 | 250 | min_xtp(); |
1da177e4 | 251 | #endif |
91d591c3 TG |
252 | rmb(); |
253 | if (mark_idle) | |
254 | (*mark_idle)(1); | |
255 | ||
256 | safe_halt(); | |
1da177e4 | 257 | |
91d591c3 TG |
258 | if (mark_idle) |
259 | (*mark_idle)(0); | |
1da177e4 | 260 | #ifdef CONFIG_SMP |
91d591c3 | 261 | normal_xtp(); |
1da177e4 | 262 | #endif |
1da177e4 LT |
263 | } |
264 | ||
265 | void | |
266 | ia64_save_extra (struct task_struct *task) | |
267 | { | |
268 | #ifdef CONFIG_PERFMON | |
269 | unsigned long info; | |
270 | #endif | |
271 | ||
272 | if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0) | |
273 | ia64_save_debug_regs(&task->thread.dbr[0]); | |
274 | ||
275 | #ifdef CONFIG_PERFMON | |
276 | if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0) | |
277 | pfm_save_regs(task); | |
278 | ||
6065a244 | 279 | info = __this_cpu_read(pfm_syst_info); |
1da177e4 LT |
280 | if (info & PFM_CPUINFO_SYST_WIDE) |
281 | pfm_syst_wide_update_task(task, info, 0); | |
282 | #endif | |
1da177e4 LT |
283 | } |
284 | ||
285 | void | |
286 | ia64_load_extra (struct task_struct *task) | |
287 | { | |
288 | #ifdef CONFIG_PERFMON | |
289 | unsigned long info; | |
290 | #endif | |
291 | ||
292 | if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0) | |
293 | ia64_load_debug_regs(&task->thread.dbr[0]); | |
294 | ||
295 | #ifdef CONFIG_PERFMON | |
296 | if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0) | |
297 | pfm_load_regs(task); | |
298 | ||
6065a244 | 299 | info = __this_cpu_read(pfm_syst_info); |
1da177e4 LT |
300 | if (info & PFM_CPUINFO_SYST_WIDE) |
301 | pfm_syst_wide_update_task(task, info, 1); | |
302 | #endif | |
1da177e4 LT |
303 | } |
304 | ||
305 | /* | |
306 | * Copy the state of an ia-64 thread. | |
307 | * | |
308 | * We get here through the following call chain: | |
309 | * | |
310 | * from user-level: from kernel: | |
311 | * | |
312 | * <clone syscall> <some kernel call frames> | |
313 | * sys_clone : | |
314 | * do_fork do_fork | |
315 | * copy_thread copy_thread | |
316 | * | |
317 | * This means that the stack layout is as follows: | |
318 | * | |
319 | * +---------------------+ (highest addr) | |
320 | * | struct pt_regs | | |
321 | * +---------------------+ | |
322 | * | struct switch_stack | | |
323 | * +---------------------+ | |
324 | * | | | |
325 | * | memory stack | | |
326 | * | | <-- sp (lowest addr) | |
327 | * +---------------------+ | |
328 | * | |
329 | * Observe that we copy the unat values that are in pt_regs and switch_stack. Spilling an | |
330 | * integer to address X causes bit N in ar.unat to be set to the NaT bit of the register, | |
331 | * with N=(X & 0x1ff)/8. Thus, copying the unat value preserves the NaT bits ONLY if the | |
332 | * pt_regs structure in the parent is congruent to that of the child, modulo 512. Since | |
333 | * the stack is page aligned and the page size is at least 4KB, this is always the case, | |
334 | * so there is nothing to worry about. | |
335 | */ | |
336 | int | |
6f2c55b8 | 337 | copy_thread(unsigned long clone_flags, |
1da177e4 | 338 | unsigned long user_stack_base, unsigned long user_stack_size, |
afa86fc4 | 339 | struct task_struct *p) |
1da177e4 | 340 | { |
32974ad4 | 341 | extern char ia64_ret_from_clone; |
1da177e4 LT |
342 | struct switch_stack *child_stack, *stack; |
343 | unsigned long rbs, child_rbs, rbs_size; | |
344 | struct pt_regs *child_ptregs; | |
afa86fc4 | 345 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 LT |
346 | int retval = 0; |
347 | ||
1da177e4 LT |
348 | child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1; |
349 | child_stack = (struct switch_stack *) child_ptregs - 1; | |
350 | ||
1da177e4 LT |
351 | rbs = (unsigned long) current + IA64_RBS_OFFSET; |
352 | child_rbs = (unsigned long) p + IA64_RBS_OFFSET; | |
1da177e4 | 353 | |
1da177e4 LT |
354 | /* copy parts of thread_struct: */ |
355 | p->thread.ksp = (unsigned long) child_stack - 16; | |
356 | ||
1da177e4 LT |
357 | /* |
358 | * NOTE: The calling convention considers all floating point | |
359 | * registers in the high partition (fph) to be scratch. Since | |
360 | * the only way to get to this point is through a system call, | |
361 | * we know that the values in fph are all dead. Hence, there | |
362 | * is no need to inherit the fph state from the parent to the | |
363 | * child and all we have to do is to make sure that | |
364 | * IA64_THREAD_FPH_VALID is cleared in the child. | |
365 | * | |
366 | * XXX We could push this optimization a bit further by | |
367 | * clearing IA64_THREAD_FPH_VALID on ANY system call. | |
368 | * However, it's not clear this is worth doing. Also, it | |
369 | * would be a slight deviation from the normal Linux system | |
370 | * call behavior where scratch registers are preserved across | |
371 | * system calls (unless used by the system call itself). | |
372 | */ | |
373 | # define THREAD_FLAGS_TO_CLEAR (IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID \ | |
374 | | IA64_THREAD_PM_VALID) | |
375 | # define THREAD_FLAGS_TO_SET 0 | |
376 | p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR) | |
377 | | THREAD_FLAGS_TO_SET); | |
54d496c3 | 378 | |
1da177e4 | 379 | ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */ |
1da177e4 | 380 | |
54d496c3 AV |
381 | if (unlikely(p->flags & PF_KTHREAD)) { |
382 | if (unlikely(!user_stack_base)) { | |
383 | /* fork_idle() called us */ | |
384 | return 0; | |
385 | } | |
386 | memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack)); | |
387 | child_stack->r4 = user_stack_base; /* payload */ | |
388 | child_stack->r5 = user_stack_size; /* argument */ | |
389 | /* | |
390 | * Preserve PSR bits, except for bits 32-34 and 37-45, | |
391 | * which we can't read. | |
392 | */ | |
393 | child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN; | |
394 | /* mark as valid, empty frame */ | |
395 | child_ptregs->cr_ifs = 1UL << 63; | |
396 | child_stack->ar_fpsr = child_ptregs->ar_fpsr | |
397 | = ia64_getreg(_IA64_REG_AR_FPSR); | |
398 | child_stack->pr = (1 << PRED_KERNEL_STACK); | |
399 | child_stack->ar_bspstore = child_rbs; | |
400 | child_stack->b0 = (unsigned long) &ia64_ret_from_clone; | |
401 | ||
402 | /* stop some PSR bits from being inherited. | |
403 | * the psr.up/psr.pp bits must be cleared on fork but inherited on execve() | |
404 | * therefore we must specify them explicitly here and not include them in | |
405 | * IA64_PSR_BITS_TO_CLEAR. | |
406 | */ | |
407 | child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) | |
408 | & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); | |
409 | ||
410 | return 0; | |
411 | } | |
412 | stack = ((struct switch_stack *) regs) - 1; | |
413 | /* copy parent's switch_stack & pt_regs to child: */ | |
414 | memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack)); | |
415 | ||
416 | /* copy the parent's register backing store to the child: */ | |
417 | rbs_size = stack->ar_bspstore - rbs; | |
418 | memcpy((void *) child_rbs, (void *) rbs, rbs_size); | |
419 | if (clone_flags & CLONE_SETTLS) | |
420 | child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */ | |
421 | if (user_stack_base) { | |
422 | child_ptregs->r12 = user_stack_base + user_stack_size - 16; | |
423 | child_ptregs->ar_bspstore = user_stack_base; | |
424 | child_ptregs->ar_rnat = 0; | |
425 | child_ptregs->loadrs = 0; | |
426 | } | |
427 | child_stack->ar_bspstore = child_rbs + rbs_size; | |
428 | child_stack->b0 = (unsigned long) &ia64_ret_from_clone; | |
429 | ||
430 | /* stop some PSR bits from being inherited. | |
431 | * the psr.up/psr.pp bits must be cleared on fork but inherited on execve() | |
432 | * therefore we must specify them explicitly here and not include them in | |
433 | * IA64_PSR_BITS_TO_CLEAR. | |
434 | */ | |
435 | child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) | |
436 | & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); | |
437 | ||
1da177e4 LT |
438 | #ifdef CONFIG_PERFMON |
439 | if (current->thread.pfm_context) | |
440 | pfm_inherit(p, child_ptregs); | |
441 | #endif | |
442 | return retval; | |
443 | } | |
444 | ||
445 | static void | |
446 | do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg) | |
447 | { | |
256a7e09 JS |
448 | unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm; |
449 | unsigned long uninitialized_var(ip); /* GCC be quiet */ | |
1da177e4 LT |
450 | elf_greg_t *dst = arg; |
451 | struct pt_regs *pt; | |
452 | char nat; | |
453 | int i; | |
454 | ||
455 | memset(dst, 0, sizeof(elf_gregset_t)); /* don't leak any kernel bits to user-level */ | |
456 | ||
457 | if (unw_unwind_to_user(info) < 0) | |
458 | return; | |
459 | ||
460 | unw_get_sp(info, &sp); | |
461 | pt = (struct pt_regs *) (sp + 16); | |
462 | ||
463 | urbs_end = ia64_get_user_rbs_end(task, pt, &cfm); | |
464 | ||
465 | if (ia64_sync_user_rbs(task, info->sw, pt->ar_bspstore, urbs_end) < 0) | |
466 | return; | |
467 | ||
468 | ia64_peek(task, info->sw, urbs_end, (long) ia64_rse_rnat_addr((long *) urbs_end), | |
469 | &ar_rnat); | |
470 | ||
471 | /* | |
472 | * coredump format: | |
473 | * r0-r31 | |
474 | * NaT bits (for r0-r31; bit N == 1 iff rN is a NaT) | |
475 | * predicate registers (p0-p63) | |
476 | * b0-b7 | |
477 | * ip cfm user-mask | |
478 | * ar.rsc ar.bsp ar.bspstore ar.rnat | |
479 | * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec | |
480 | */ | |
481 | ||
482 | /* r0 is zero */ | |
483 | for (i = 1, mask = (1UL << i); i < 32; ++i) { | |
484 | unw_get_gr(info, i, &dst[i], &nat); | |
485 | if (nat) | |
486 | nat_bits |= mask; | |
487 | mask <<= 1; | |
488 | } | |
489 | dst[32] = nat_bits; | |
490 | unw_get_pr(info, &dst[33]); | |
491 | ||
492 | for (i = 0; i < 8; ++i) | |
493 | unw_get_br(info, i, &dst[34 + i]); | |
494 | ||
495 | unw_get_rp(info, &ip); | |
496 | dst[42] = ip + ia64_psr(pt)->ri; | |
497 | dst[43] = cfm; | |
498 | dst[44] = pt->cr_ipsr & IA64_PSR_UM; | |
499 | ||
500 | unw_get_ar(info, UNW_AR_RSC, &dst[45]); | |
501 | /* | |
502 | * For bsp and bspstore, unw_get_ar() would return the kernel | |
503 | * addresses, but we need the user-level addresses instead: | |
504 | */ | |
505 | dst[46] = urbs_end; /* note: by convention PT_AR_BSP points to the end of the urbs! */ | |
506 | dst[47] = pt->ar_bspstore; | |
507 | dst[48] = ar_rnat; | |
508 | unw_get_ar(info, UNW_AR_CCV, &dst[49]); | |
509 | unw_get_ar(info, UNW_AR_UNAT, &dst[50]); | |
510 | unw_get_ar(info, UNW_AR_FPSR, &dst[51]); | |
511 | dst[52] = pt->ar_pfs; /* UNW_AR_PFS is == to pt->cr_ifs for interrupt frames */ | |
512 | unw_get_ar(info, UNW_AR_LC, &dst[53]); | |
513 | unw_get_ar(info, UNW_AR_EC, &dst[54]); | |
514 | unw_get_ar(info, UNW_AR_CSD, &dst[55]); | |
515 | unw_get_ar(info, UNW_AR_SSD, &dst[56]); | |
516 | } | |
517 | ||
518 | void | |
519 | do_dump_task_fpu (struct task_struct *task, struct unw_frame_info *info, void *arg) | |
520 | { | |
521 | elf_fpreg_t *dst = arg; | |
522 | int i; | |
523 | ||
524 | memset(dst, 0, sizeof(elf_fpregset_t)); /* don't leak any "random" bits */ | |
525 | ||
526 | if (unw_unwind_to_user(info) < 0) | |
527 | return; | |
528 | ||
529 | /* f0 is 0.0, f1 is 1.0 */ | |
530 | ||
531 | for (i = 2; i < 32; ++i) | |
532 | unw_get_fr(info, i, dst + i); | |
533 | ||
534 | ia64_flush_fph(task); | |
535 | if ((task->thread.flags & IA64_THREAD_FPH_VALID) != 0) | |
536 | memcpy(dst + 32, task->thread.fph, 96*16); | |
537 | } | |
538 | ||
539 | void | |
540 | do_copy_regs (struct unw_frame_info *info, void *arg) | |
541 | { | |
542 | do_copy_task_regs(current, info, arg); | |
543 | } | |
544 | ||
545 | void | |
546 | do_dump_fpu (struct unw_frame_info *info, void *arg) | |
547 | { | |
548 | do_dump_task_fpu(current, info, arg); | |
549 | } | |
550 | ||
1da177e4 LT |
551 | void |
552 | ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst) | |
553 | { | |
554 | unw_init_running(do_copy_regs, dst); | |
555 | } | |
556 | ||
1da177e4 LT |
557 | int |
558 | dump_fpu (struct pt_regs *pt, elf_fpregset_t dst) | |
559 | { | |
560 | unw_init_running(do_dump_fpu, dst); | |
561 | return 1; /* f0-f31 are always valid so we always return 1 */ | |
562 | } | |
563 | ||
1da177e4 LT |
564 | /* |
565 | * Flush thread state. This is called when a thread does an execve(). | |
566 | */ | |
567 | void | |
568 | flush_thread (void) | |
569 | { | |
570 | /* drop floating-point and debug-register state if it exists: */ | |
571 | current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID); | |
572 | ia64_drop_fpu(current); | |
1da177e4 LT |
573 | } |
574 | ||
575 | /* | |
e6464694 | 576 | * Clean up state associated with a thread. This is called when |
1da177e4 LT |
577 | * the thread calls exit(). |
578 | */ | |
579 | void | |
e6464694 | 580 | exit_thread (struct task_struct *tsk) |
1da177e4 | 581 | { |
9508dbfe | 582 | |
e6464694 | 583 | ia64_drop_fpu(tsk); |
1da177e4 LT |
584 | #ifdef CONFIG_PERFMON |
585 | /* if needed, stop monitoring and flush state to perfmon context */ | |
e6464694 JS |
586 | if (tsk->thread.pfm_context) |
587 | pfm_exit_thread(tsk); | |
1da177e4 LT |
588 | |
589 | /* free debug register resources */ | |
e6464694 JS |
590 | if (tsk->thread.flags & IA64_THREAD_DBG_VALID) |
591 | pfm_release_debug_registers(tsk); | |
1da177e4 | 592 | #endif |
1da177e4 LT |
593 | } |
594 | ||
595 | unsigned long | |
596 | get_wchan (struct task_struct *p) | |
597 | { | |
598 | struct unw_frame_info info; | |
599 | unsigned long ip; | |
600 | int count = 0; | |
601 | ||
6ae38488 RH |
602 | if (!p || p == current || p->state == TASK_RUNNING) |
603 | return 0; | |
604 | ||
1da177e4 LT |
605 | /* |
606 | * Note: p may not be a blocked task (it could be current or | |
607 | * another process running on some other CPU. Rather than | |
608 | * trying to determine if p is really blocked, we just assume | |
609 | * it's blocked and rely on the unwind routines to fail | |
610 | * gracefully if the process wasn't really blocked after all. | |
611 | * --davidm 99/12/15 | |
612 | */ | |
613 | unw_init_from_blocked_task(&info, p); | |
614 | do { | |
6ae38488 RH |
615 | if (p->state == TASK_RUNNING) |
616 | return 0; | |
1da177e4 LT |
617 | if (unw_unwind(&info) < 0) |
618 | return 0; | |
619 | unw_get_ip(&info, &ip); | |
620 | if (!in_sched_functions(ip)) | |
621 | return ip; | |
622 | } while (count++ < 16); | |
623 | return 0; | |
624 | } | |
625 | ||
626 | void | |
627 | cpu_halt (void) | |
628 | { | |
629 | pal_power_mgmt_info_u_t power_info[8]; | |
630 | unsigned long min_power; | |
631 | int i, min_power_state; | |
632 | ||
633 | if (ia64_pal_halt_info(power_info) != 0) | |
634 | return; | |
635 | ||
636 | min_power_state = 0; | |
637 | min_power = power_info[0].pal_power_mgmt_info_s.power_consumption; | |
638 | for (i = 1; i < 8; ++i) | |
639 | if (power_info[i].pal_power_mgmt_info_s.im | |
640 | && power_info[i].pal_power_mgmt_info_s.power_consumption < min_power) { | |
641 | min_power = power_info[i].pal_power_mgmt_info_s.power_consumption; | |
642 | min_power_state = i; | |
643 | } | |
644 | ||
645 | while (1) | |
646 | ia64_pal_halt(min_power_state); | |
647 | } | |
648 | ||
c237508a H |
649 | void machine_shutdown(void) |
650 | { | |
651 | #ifdef CONFIG_HOTPLUG_CPU | |
652 | int cpu; | |
653 | ||
654 | for_each_online_cpu(cpu) { | |
655 | if (cpu != smp_processor_id()) | |
656 | cpu_down(cpu); | |
657 | } | |
658 | #endif | |
659 | #ifdef CONFIG_KEXEC | |
660 | kexec_disable_iosapic(); | |
661 | #endif | |
662 | } | |
663 | ||
1da177e4 LT |
664 | void |
665 | machine_restart (char *restart_cmd) | |
666 | { | |
9138d581 | 667 | (void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0); |
8562c99c | 668 | efi_reboot(REBOOT_WARM, NULL); |
1da177e4 LT |
669 | } |
670 | ||
1da177e4 LT |
671 | void |
672 | machine_halt (void) | |
673 | { | |
9138d581 | 674 | (void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0); |
1da177e4 LT |
675 | cpu_halt(); |
676 | } | |
677 | ||
1da177e4 LT |
678 | void |
679 | machine_power_off (void) | |
680 | { | |
681 | if (pm_power_off) | |
682 | pm_power_off(); | |
683 | machine_halt(); | |
684 | } | |
685 |