Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Architecture-specific setup. |
| 3 | * |
| 4 | * Copyright (C) 1998-2003 Hewlett-Packard Co |
| 5 | * David Mosberger-Tang <davidm@hpl.hp.com> |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 6 | * 04/11/17 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support |
Keith Owens | 9138d58 | 2005-11-07 11:27:13 -0800 | [diff] [blame] | 7 | * |
| 8 | * 2005-10-07 Keith Owens <kaos@sgi.com> |
| 9 | * Add notify_die() hooks. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/module.h> |
| 20 | #include <linux/notifier.h> |
| 21 | #include <linux/personality.h> |
| 22 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 29 | #include <linux/kdebug.h> |
Luck, Tony | ee211b3 | 2007-12-18 11:46:38 -0800 | [diff] [blame] | 30 | #include <linux/utsname.h> |
Shaohua Li | f14488c | 2008-10-06 10:43:06 -0700 | [diff] [blame] | 31 | #include <linux/tracehook.h> |
Paul E. McKenney | 93482f4 | 2012-08-24 13:22:13 -0700 | [diff] [blame] | 32 | #include <linux/rcupdate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | #include <asm/cpu.h> |
| 35 | #include <asm/delay.h> |
| 36 | #include <asm/elf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <asm/irq.h> |
Horms | c237508 | 2007-02-05 13:49:10 -0800 | [diff] [blame] | 38 | #include <asm/kexec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/pgalloc.h> |
| 40 | #include <asm/processor.h> |
| 41 | #include <asm/sal.h> |
Luck, Tony | 93f3788 | 2012-03-29 13:35:22 -0700 | [diff] [blame] | 42 | #include <asm/switch_to.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #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 | |
| 56 | void (*ia64_mark_idle)(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 58 | unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | EXPORT_SYMBOL(boot_option_idle_override); |
Alex Chiang | d868080 | 2010-02-25 14:09:52 -0700 | [diff] [blame] | 60 | void (*pm_idle) (void); |
| 61 | EXPORT_SYMBOL(pm_idle); |
| 62 | void (*pm_power_off) (void); |
| 63 | EXPORT_SYMBOL(pm_power_off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
| 65 | void |
| 66 | ia64_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 | |
| 87 | void |
| 88 | show_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 | |
| 100 | void |
| 101 | dump_stack (void) |
| 102 | { |
| 103 | show_stack(NULL, NULL); |
| 104 | } |
| 105 | |
| 106 | EXPORT_SYMBOL(dump_stack); |
| 107 | |
| 108 | void |
| 109 | show_regs (struct pt_regs *regs) |
| 110 | { |
| 111 | unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri; |
| 112 | |
| 113 | print_modules(); |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 114 | printk("\nPid: %d, CPU %d, comm: %20s\n", task_pid_nr(current), |
| 115 | smp_processor_id(), current->comm); |
Luck, Tony | ee211b3 | 2007-12-18 11:46:38 -0800 | [diff] [blame] | 116 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | 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 Sinha | 353f6dd | 2009-09-14 11:13:37 -0700 | [diff] [blame] | 165 | /* local support for deprecated console_print */ |
| 166 | void |
| 167 | console_print(const char *s) |
| 168 | { |
| 169 | printk(KERN_EMERG "%s", s); |
| 170 | } |
| 171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | void |
Hidetoshi Seto | 3633c73 | 2008-05-09 15:26:35 +0900 | [diff] [blame] | 173 | do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | { |
| 175 | if (fsys_mode(current, &scr->pt)) { |
Hidetoshi Seto | 3633c73 | 2008-05-09 15:26:35 +0900 | [diff] [blame] | 176 | /* |
| 177 | * defer signal-handling etc. until we return to |
| 178 | * privilege-level 0. |
| 179 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | 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 Seto | 3633c73 | 2008-05-09 15:26:35 +0900 | [diff] [blame] | 187 | /* |
| 188 | * Note: pfm_handle_work() allow us to call it with interrupts |
| 189 | * disabled, and may enable interrupts within the function. |
| 190 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | pfm_handle_work(); |
| 192 | #endif |
| 193 | |
| 194 | /* deal with pending signal delivery */ |
Hidetoshi Seto | 3633c73 | 2008-05-09 15:26:35 +0900 | [diff] [blame] | 195 | if (test_thread_flag(TIF_SIGPENDING)) { |
| 196 | local_irq_enable(); /* force interrupt enable */ |
Alexey Dobriyan | 4a177cb | 2007-01-23 19:03:17 +0300 | [diff] [blame] | 197 | ia64_do_signal(scr, in_syscall); |
Hidetoshi Seto | 3633c73 | 2008-05-09 15:26:35 +0900 | [diff] [blame] | 198 | } |
Petr Tesarik | 3b2ce0b | 2007-12-12 15:23:34 +0100 | [diff] [blame] | 199 | |
Tony Luck | 0967237 | 2012-09-20 11:47:13 -0700 | [diff] [blame] | 200 | if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) { |
| 201 | local_irq_enable(); /* force interrupt enable */ |
Shaohua Li | f14488c | 2008-10-06 10:43:06 -0700 | [diff] [blame] | 202 | tracehook_notify_resume(&scr->pt); |
| 203 | } |
| 204 | |
Petr Tesarik | 3b2ce0b | 2007-12-12 15:23:34 +0100 | [diff] [blame] | 205 | /* copy user rbs to kernel rbs */ |
Hidetoshi Seto | 3633c73 | 2008-05-09 15:26:35 +0900 | [diff] [blame] | 206 | if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) { |
| 207 | local_irq_enable(); /* force interrupt enable */ |
Petr Tesarik | 3b2ce0b | 2007-12-12 15:23:34 +0100 | [diff] [blame] | 208 | ia64_sync_krbs(); |
Hidetoshi Seto | 3633c73 | 2008-05-09 15:26:35 +0900 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | local_irq_disable(); /* force interrupt disable */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
Stephane Eranian | 8df5a50 | 2005-04-11 13:45:00 -0700 | [diff] [blame] | 214 | static int pal_halt = 1; |
| 215 | static int can_do_pal_halt = 1; |
| 216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | static int __init nohalt_setup(char * str) |
| 218 | { |
Ken Chen | fb57385 | 2005-08-08 15:25:00 -0700 | [diff] [blame] | 219 | pal_halt = can_do_pal_halt = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | return 1; |
| 221 | } |
| 222 | __setup("nohalt", nohalt_setup); |
| 223 | |
Tony Luck | a71f62e | 2005-05-03 16:21:45 -0700 | [diff] [blame] | 224 | void |
Stephane Eranian | 8df5a50 | 2005-04-11 13:45:00 -0700 | [diff] [blame] | 225 | update_pal_halt_status(int status) |
| 226 | { |
| 227 | can_do_pal_halt = pal_halt && status; |
| 228 | } |
| 229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | /* |
| 231 | * We use this if we don't have any better idle routine.. |
| 232 | */ |
| 233 | void |
| 234 | default_idle (void) |
| 235 | { |
Venkatesh Pallipadi | 6c4fa56 | 2005-04-18 23:06:47 -0400 | [diff] [blame] | 236 | local_irq_enable(); |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 237 | while (!need_resched()) { |
Dimitri Sivanich | 71416be | 2007-08-07 08:49:32 -0500 | [diff] [blame] | 238 | if (can_do_pal_halt) { |
| 239 | local_irq_disable(); |
| 240 | if (!need_resched()) { |
| 241 | safe_halt(); |
| 242 | } |
| 243 | local_irq_enable(); |
| 244 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | cpu_relax(); |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 246 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | #ifdef CONFIG_HOTPLUG_CPU |
| 250 | /* We don't actually take CPU down, just spin without interrupts. */ |
| 251 | static inline void play_dead(void) |
| 252 | { |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 253 | unsigned int this_cpu = smp_processor_id(); |
| 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | /* Ack it */ |
| 256 | __get_cpu_var(cpu_state) = CPU_DEAD; |
| 257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | max_xtp(); |
| 259 | local_irq_disable(); |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 260 | idle_task_exit(); |
| 261 | ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | /* |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 263 | * The above is a point of no-return, the processor is |
| 264 | * expected to be in SAL loop now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | */ |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 266 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
| 268 | #else |
| 269 | static inline void play_dead(void) |
| 270 | { |
| 271 | BUG(); |
| 272 | } |
| 273 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | void __attribute__((noreturn)) |
| 276 | cpu_idle (void) |
| 277 | { |
| 278 | void (*mark_idle)(int) = ia64_mark_idle; |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 279 | int cpu = smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
| 281 | /* endless idle loop with no priority at all */ |
| 282 | while (1) { |
Paul E. McKenney | 93482f4 | 2012-08-24 13:22:13 -0700 | [diff] [blame] | 283 | rcu_idle_enter(); |
Ingo Molnar | 0888f06 | 2006-12-22 01:11:56 -0800 | [diff] [blame] | 284 | if (can_do_pal_halt) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 285 | current_thread_info()->status &= ~TS_POLLING; |
Ingo Molnar | 0888f06 | 2006-12-22 01:11:56 -0800 | [diff] [blame] | 286 | /* |
| 287 | * TS_POLLING-cleared state must be visible before we |
| 288 | * test NEED_RESCHED: |
| 289 | */ |
| 290 | smp_mb(); |
| 291 | } else { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 292 | current_thread_info()->status |= TS_POLLING; |
Ingo Molnar | 0888f06 | 2006-12-22 01:11:56 -0800 | [diff] [blame] | 293 | } |
Chen, Kenneth W | 1e185b9 | 2005-11-15 14:37:05 -0800 | [diff] [blame] | 294 | |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 295 | if (!need_resched()) { |
| 296 | void (*idle)(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | #ifdef CONFIG_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | min_xtp(); |
| 299 | #endif |
Zwane Mwaikambo | 7d5f9c0 | 2005-03-30 21:40:00 -0700 | [diff] [blame] | 300 | rmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | if (mark_idle) |
| 302 | (*mark_idle)(1); |
| 303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | idle = pm_idle; |
| 305 | if (!idle) |
| 306 | idle = default_idle; |
| 307 | (*idle)(); |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 308 | if (mark_idle) |
| 309 | (*mark_idle)(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | #ifdef CONFIG_SMP |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 311 | normal_xtp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | #endif |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 313 | } |
Paul E. McKenney | 93482f4 | 2012-08-24 13:22:13 -0700 | [diff] [blame] | 314 | rcu_idle_exit(); |
Thomas Gleixner | bd2f553 | 2011-03-21 12:33:18 +0100 | [diff] [blame] | 315 | schedule_preempt_disabled(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | check_pgt_cache(); |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 317 | if (cpu_is_offline(cpu)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | play_dead(); |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | void |
| 323 | ia64_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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
| 341 | |
| 342 | void |
| 343 | ia64_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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | } |
| 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 | */ |
| 393 | int |
Alexey Dobriyan | 6f2c55b | 2009-04-02 16:56:59 -0700 | [diff] [blame] | 394 | copy_thread(unsigned long clone_flags, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | unsigned long user_stack_base, unsigned long user_stack_size, |
Al Viro | afa86fc | 2012-10-22 22:51:14 -0400 | [diff] [blame] | 396 | struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | { |
Tony Luck | 32974ad | 2010-02-08 10:42:17 -0800 | [diff] [blame] | 398 | extern char ia64_ret_from_clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | struct switch_stack *child_stack, *stack; |
| 400 | unsigned long rbs, child_rbs, rbs_size; |
| 401 | struct pt_regs *child_ptregs; |
Al Viro | afa86fc | 2012-10-22 22:51:14 -0400 | [diff] [blame] | 402 | struct pt_regs *regs = current_pt_regs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | int retval = 0; |
| 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1; |
| 406 | child_stack = (struct switch_stack *) child_ptregs - 1; |
| 407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | rbs = (unsigned long) current + IA64_RBS_OFFSET; |
| 409 | child_rbs = (unsigned long) p + IA64_RBS_OFFSET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | /* copy parts of thread_struct: */ |
| 412 | p->thread.ksp = (unsigned long) child_stack - 16; |
| 413 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | /* |
| 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 Viro | 54d496c | 2012-10-14 15:43:06 -0400 | [diff] [blame] | 435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
Al Viro | 54d496c | 2012-10-14 15:43:06 -0400 | [diff] [blame] | 438 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | #ifdef CONFIG_PERFMON |
| 496 | if (current->thread.pfm_context) |
| 497 | pfm_inherit(p, child_ptregs); |
| 498 | #endif |
| 499 | return retval; |
| 500 | } |
| 501 | |
| 502 | static void |
| 503 | do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg) |
| 504 | { |
Jes Sorensen | 256a7e0 | 2007-07-11 17:26:30 +0200 | [diff] [blame] | 505 | unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm; |
| 506 | unsigned long uninitialized_var(ip); /* GCC be quiet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | 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 | |
| 575 | void |
| 576 | do_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 | |
| 596 | void |
| 597 | do_copy_regs (struct unw_frame_info *info, void *arg) |
| 598 | { |
| 599 | do_copy_task_regs(current, info, arg); |
| 600 | } |
| 601 | |
| 602 | void |
| 603 | do_dump_fpu (struct unw_frame_info *info, void *arg) |
| 604 | { |
| 605 | do_dump_task_fpu(current, info, arg); |
| 606 | } |
| 607 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | void |
| 609 | ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst) |
| 610 | { |
| 611 | unw_init_running(do_copy_regs, dst); |
| 612 | } |
| 613 | |
| 614 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | dump_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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | /* |
| 622 | * Flush thread state. This is called when a thread does an execve(). |
| 623 | */ |
| 624 | void |
| 625 | flush_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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | /* |
| 633 | * Clean up state associated with current thread. This is called when |
| 634 | * the thread calls exit(). |
| 635 | */ |
| 636 | void |
| 637 | exit_thread (void) |
| 638 | { |
Rusty Lynch | 9508dbf | 2005-06-27 15:17:12 -0700 | [diff] [blame] | 639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | } |
| 651 | |
| 652 | unsigned long |
| 653 | get_wchan (struct task_struct *p) |
| 654 | { |
| 655 | struct unw_frame_info info; |
| 656 | unsigned long ip; |
| 657 | int count = 0; |
| 658 | |
Robin Holt | 6ae3848 | 2007-05-18 13:46:52 -0500 | [diff] [blame] | 659 | if (!p || p == current || p->state == TASK_RUNNING) |
| 660 | return 0; |
| 661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | /* |
| 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 Holt | 6ae3848 | 2007-05-18 13:46:52 -0500 | [diff] [blame] | 672 | if (p->state == TASK_RUNNING) |
| 673 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | 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 | |
| 683 | void |
| 684 | cpu_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 | |
Horms | c237508 | 2007-02-05 13:49:10 -0800 | [diff] [blame] | 706 | void 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | void |
| 722 | machine_restart (char *restart_cmd) |
| 723 | { |
Keith Owens | 9138d58 | 2005-11-07 11:27:13 -0800 | [diff] [blame] | 724 | (void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | (*efi.reset_system)(EFI_RESET_WARM, 0, 0, NULL); |
| 726 | } |
| 727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | void |
| 729 | machine_halt (void) |
| 730 | { |
Keith Owens | 9138d58 | 2005-11-07 11:27:13 -0800 | [diff] [blame] | 731 | (void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | cpu_halt(); |
| 733 | } |
| 734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | void |
| 736 | machine_power_off (void) |
| 737 | { |
| 738 | if (pm_power_off) |
| 739 | pm_power_off(); |
| 740 | machine_halt(); |
| 741 | } |
| 742 | |