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610 lines
17 KiB
610 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Architecture-specific setup. |
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* |
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* Copyright (C) 1998-2003 Hewlett-Packard Co |
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* David Mosberger-Tang <[email protected]> |
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* 04/11/17 Ashok Raj <[email protected]> Added CPU Hotplug Support |
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* |
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* 2005-10-07 Keith Owens <[email protected]> |
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* Add notify_die() hooks. |
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*/ |
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#include <linux/cpu.h> |
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#include <linux/pm.h> |
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#include <linux/elf.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/notifier.h> |
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#include <linux/personality.h> |
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#include <linux/sched.h> |
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#include <linux/sched/debug.h> |
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#include <linux/sched/hotplug.h> |
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#include <linux/sched/task.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/stddef.h> |
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#include <linux/thread_info.h> |
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#include <linux/unistd.h> |
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#include <linux/efi.h> |
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#include <linux/interrupt.h> |
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#include <linux/delay.h> |
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#include <linux/kdebug.h> |
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#include <linux/utsname.h> |
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#include <linux/tracehook.h> |
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#include <linux/rcupdate.h> |
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|
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#include <asm/cpu.h> |
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#include <asm/delay.h> |
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#include <asm/elf.h> |
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#include <asm/irq.h> |
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#include <asm/kexec.h> |
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#include <asm/processor.h> |
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#include <asm/sal.h> |
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#include <asm/switch_to.h> |
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#include <asm/tlbflush.h> |
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#include <linux/uaccess.h> |
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#include <asm/unwind.h> |
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#include <asm/user.h> |
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#include <asm/xtp.h> |
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|
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#include "entry.h" |
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|
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#include "sigframe.h" |
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|
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void (*ia64_mark_idle)(int); |
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|
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unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE; |
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EXPORT_SYMBOL(boot_option_idle_override); |
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void (*pm_power_off) (void); |
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EXPORT_SYMBOL(pm_power_off); |
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|
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static void |
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ia64_do_show_stack (struct unw_frame_info *info, void *arg) |
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{ |
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unsigned long ip, sp, bsp; |
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const char *loglvl = arg; |
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printk("%s\nCall Trace:\n", loglvl); |
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do { |
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unw_get_ip(info, &ip); |
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if (ip == 0) |
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break; |
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unw_get_sp(info, &sp); |
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unw_get_bsp(info, &bsp); |
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printk("%s [<%016lx>] %pS\n" |
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" sp=%016lx bsp=%016lx\n", |
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loglvl, ip, (void *)ip, sp, bsp); |
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} while (unw_unwind(info) >= 0); |
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} |
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void |
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show_stack (struct task_struct *task, unsigned long *sp, const char *loglvl) |
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{ |
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if (!task) |
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unw_init_running(ia64_do_show_stack, (void *)loglvl); |
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else { |
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struct unw_frame_info info; |
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unw_init_from_blocked_task(&info, task); |
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ia64_do_show_stack(&info, (void *)loglvl); |
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} |
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} |
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void |
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show_regs (struct pt_regs *regs) |
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{ |
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unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri; |
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print_modules(); |
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printk("\n"); |
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show_regs_print_info(KERN_DEFAULT); |
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printk("psr : %016lx ifs : %016lx ip : [<%016lx>] %s (%s)\n", |
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regs->cr_ipsr, regs->cr_ifs, ip, print_tainted(), |
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init_utsname()->release); |
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printk("ip is at %pS\n", (void *)ip); |
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printk("unat: %016lx pfs : %016lx rsc : %016lx\n", |
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regs->ar_unat, regs->ar_pfs, regs->ar_rsc); |
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printk("rnat: %016lx bsps: %016lx pr : %016lx\n", |
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regs->ar_rnat, regs->ar_bspstore, regs->pr); |
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printk("ldrs: %016lx ccv : %016lx fpsr: %016lx\n", |
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regs->loadrs, regs->ar_ccv, regs->ar_fpsr); |
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printk("csd : %016lx ssd : %016lx\n", regs->ar_csd, regs->ar_ssd); |
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printk("b0 : %016lx b6 : %016lx b7 : %016lx\n", regs->b0, regs->b6, regs->b7); |
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printk("f6 : %05lx%016lx f7 : %05lx%016lx\n", |
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regs->f6.u.bits[1], regs->f6.u.bits[0], |
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regs->f7.u.bits[1], regs->f7.u.bits[0]); |
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printk("f8 : %05lx%016lx f9 : %05lx%016lx\n", |
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regs->f8.u.bits[1], regs->f8.u.bits[0], |
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regs->f9.u.bits[1], regs->f9.u.bits[0]); |
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printk("f10 : %05lx%016lx f11 : %05lx%016lx\n", |
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regs->f10.u.bits[1], regs->f10.u.bits[0], |
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regs->f11.u.bits[1], regs->f11.u.bits[0]); |
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printk("r1 : %016lx r2 : %016lx r3 : %016lx\n", regs->r1, regs->r2, regs->r3); |
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printk("r8 : %016lx r9 : %016lx r10 : %016lx\n", regs->r8, regs->r9, regs->r10); |
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printk("r11 : %016lx r12 : %016lx r13 : %016lx\n", regs->r11, regs->r12, regs->r13); |
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printk("r14 : %016lx r15 : %016lx r16 : %016lx\n", regs->r14, regs->r15, regs->r16); |
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printk("r17 : %016lx r18 : %016lx r19 : %016lx\n", regs->r17, regs->r18, regs->r19); |
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printk("r20 : %016lx r21 : %016lx r22 : %016lx\n", regs->r20, regs->r21, regs->r22); |
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printk("r23 : %016lx r24 : %016lx r25 : %016lx\n", regs->r23, regs->r24, regs->r25); |
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printk("r26 : %016lx r27 : %016lx r28 : %016lx\n", regs->r26, regs->r27, regs->r28); |
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printk("r29 : %016lx r30 : %016lx r31 : %016lx\n", regs->r29, regs->r30, regs->r31); |
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if (user_mode(regs)) { |
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/* print the stacked registers */ |
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unsigned long val, *bsp, ndirty; |
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int i, sof, is_nat = 0; |
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sof = regs->cr_ifs & 0x7f; /* size of frame */ |
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ndirty = (regs->loadrs >> 19); |
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bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty); |
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for (i = 0; i < sof; ++i) { |
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get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i)); |
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printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val, |
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((i == sof - 1) || (i % 3) == 2) ? "\n" : " "); |
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} |
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} else |
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show_stack(NULL, NULL, KERN_DEFAULT); |
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} |
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|
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/* local support for deprecated console_print */ |
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void |
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console_print(const char *s) |
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{ |
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printk(KERN_EMERG "%s", s); |
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} |
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void |
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do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall) |
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{ |
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if (fsys_mode(current, &scr->pt)) { |
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/* |
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* defer signal-handling etc. until we return to |
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* privilege-level 0. |
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*/ |
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if (!ia64_psr(&scr->pt)->lp) |
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ia64_psr(&scr->pt)->lp = 1; |
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return; |
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} |
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|
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/* deal with pending signal delivery */ |
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if (test_thread_flag(TIF_SIGPENDING) || |
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test_thread_flag(TIF_NOTIFY_SIGNAL)) { |
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local_irq_enable(); /* force interrupt enable */ |
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ia64_do_signal(scr, in_syscall); |
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} |
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if (test_thread_flag(TIF_NOTIFY_RESUME)) { |
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local_irq_enable(); /* force interrupt enable */ |
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tracehook_notify_resume(&scr->pt); |
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} |
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/* copy user rbs to kernel rbs */ |
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if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) { |
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local_irq_enable(); /* force interrupt enable */ |
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ia64_sync_krbs(); |
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} |
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local_irq_disable(); /* force interrupt disable */ |
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} |
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static int __init nohalt_setup(char * str) |
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{ |
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cpu_idle_poll_ctrl(true); |
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return 1; |
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} |
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__setup("nohalt", nohalt_setup); |
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#ifdef CONFIG_HOTPLUG_CPU |
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/* We don't actually take CPU down, just spin without interrupts. */ |
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static inline void play_dead(void) |
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{ |
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unsigned int this_cpu = smp_processor_id(); |
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/* Ack it */ |
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__this_cpu_write(cpu_state, CPU_DEAD); |
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max_xtp(); |
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local_irq_disable(); |
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idle_task_exit(); |
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ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]); |
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/* |
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* The above is a point of no-return, the processor is |
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* expected to be in SAL loop now. |
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*/ |
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BUG(); |
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} |
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#else |
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static inline void play_dead(void) |
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{ |
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BUG(); |
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} |
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#endif /* CONFIG_HOTPLUG_CPU */ |
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void arch_cpu_idle_dead(void) |
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{ |
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play_dead(); |
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} |
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void arch_cpu_idle(void) |
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{ |
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void (*mark_idle)(int) = ia64_mark_idle; |
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#ifdef CONFIG_SMP |
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min_xtp(); |
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#endif |
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rmb(); |
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if (mark_idle) |
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(*mark_idle)(1); |
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raw_safe_halt(); |
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if (mark_idle) |
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(*mark_idle)(0); |
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#ifdef CONFIG_SMP |
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normal_xtp(); |
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#endif |
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} |
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void |
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ia64_save_extra (struct task_struct *task) |
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{ |
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if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0) |
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ia64_save_debug_regs(&task->thread.dbr[0]); |
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} |
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void |
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ia64_load_extra (struct task_struct *task) |
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{ |
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if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0) |
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ia64_load_debug_regs(&task->thread.dbr[0]); |
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} |
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/* |
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* Copy the state of an ia-64 thread. |
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* |
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* We get here through the following call chain: |
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* |
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* from user-level: from kernel: |
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* |
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* <clone syscall> <some kernel call frames> |
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* sys_clone : |
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* kernel_clone kernel_clone |
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* copy_thread copy_thread |
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* |
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* This means that the stack layout is as follows: |
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* |
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* +---------------------+ (highest addr) |
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* | struct pt_regs | |
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* +---------------------+ |
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* | struct switch_stack | |
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* +---------------------+ |
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* | | |
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* | memory stack | |
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* | | <-- sp (lowest addr) |
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* +---------------------+ |
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* |
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* Observe that we copy the unat values that are in pt_regs and switch_stack. Spilling an |
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* integer to address X causes bit N in ar.unat to be set to the NaT bit of the register, |
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* with N=(X & 0x1ff)/8. Thus, copying the unat value preserves the NaT bits ONLY if the |
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* pt_regs structure in the parent is congruent to that of the child, modulo 512. Since |
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* the stack is page aligned and the page size is at least 4KB, this is always the case, |
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* so there is nothing to worry about. |
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*/ |
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int |
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copy_thread(unsigned long clone_flags, unsigned long user_stack_base, |
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unsigned long user_stack_size, struct task_struct *p, unsigned long tls) |
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{ |
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extern char ia64_ret_from_clone; |
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struct switch_stack *child_stack, *stack; |
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unsigned long rbs, child_rbs, rbs_size; |
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struct pt_regs *child_ptregs; |
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struct pt_regs *regs = current_pt_regs(); |
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int retval = 0; |
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child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1; |
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child_stack = (struct switch_stack *) child_ptregs - 1; |
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rbs = (unsigned long) current + IA64_RBS_OFFSET; |
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child_rbs = (unsigned long) p + IA64_RBS_OFFSET; |
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/* copy parts of thread_struct: */ |
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p->thread.ksp = (unsigned long) child_stack - 16; |
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/* |
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* NOTE: The calling convention considers all floating point |
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* registers in the high partition (fph) to be scratch. Since |
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* the only way to get to this point is through a system call, |
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* we know that the values in fph are all dead. Hence, there |
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* is no need to inherit the fph state from the parent to the |
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* child and all we have to do is to make sure that |
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* IA64_THREAD_FPH_VALID is cleared in the child. |
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* |
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* XXX We could push this optimization a bit further by |
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* clearing IA64_THREAD_FPH_VALID on ANY system call. |
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* However, it's not clear this is worth doing. Also, it |
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* would be a slight deviation from the normal Linux system |
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* call behavior where scratch registers are preserved across |
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* system calls (unless used by the system call itself). |
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*/ |
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# define THREAD_FLAGS_TO_CLEAR (IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID \ |
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| IA64_THREAD_PM_VALID) |
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# define THREAD_FLAGS_TO_SET 0 |
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p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR) |
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| THREAD_FLAGS_TO_SET); |
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ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */ |
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if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { |
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if (unlikely(!user_stack_base)) { |
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/* fork_idle() called us */ |
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return 0; |
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} |
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memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack)); |
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child_stack->r4 = user_stack_base; /* payload */ |
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child_stack->r5 = user_stack_size; /* argument */ |
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/* |
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* Preserve PSR bits, except for bits 32-34 and 37-45, |
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* which we can't read. |
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*/ |
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child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN; |
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/* mark as valid, empty frame */ |
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child_ptregs->cr_ifs = 1UL << 63; |
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child_stack->ar_fpsr = child_ptregs->ar_fpsr |
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= ia64_getreg(_IA64_REG_AR_FPSR); |
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child_stack->pr = (1 << PRED_KERNEL_STACK); |
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child_stack->ar_bspstore = child_rbs; |
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child_stack->b0 = (unsigned long) &ia64_ret_from_clone; |
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|
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/* stop some PSR bits from being inherited. |
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* the psr.up/psr.pp bits must be cleared on fork but inherited on execve() |
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* therefore we must specify them explicitly here and not include them in |
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* IA64_PSR_BITS_TO_CLEAR. |
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*/ |
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child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) |
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& ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); |
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return 0; |
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} |
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stack = ((struct switch_stack *) regs) - 1; |
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/* copy parent's switch_stack & pt_regs to child: */ |
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memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack)); |
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|
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/* copy the parent's register backing store to the child: */ |
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rbs_size = stack->ar_bspstore - rbs; |
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memcpy((void *) child_rbs, (void *) rbs, rbs_size); |
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if (clone_flags & CLONE_SETTLS) |
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child_ptregs->r13 = tls; |
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if (user_stack_base) { |
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child_ptregs->r12 = user_stack_base + user_stack_size - 16; |
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child_ptregs->ar_bspstore = user_stack_base; |
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child_ptregs->ar_rnat = 0; |
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child_ptregs->loadrs = 0; |
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} |
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child_stack->ar_bspstore = child_rbs + rbs_size; |
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child_stack->b0 = (unsigned long) &ia64_ret_from_clone; |
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|
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/* stop some PSR bits from being inherited. |
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* the psr.up/psr.pp bits must be cleared on fork but inherited on execve() |
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* therefore we must specify them explicitly here and not include them in |
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* IA64_PSR_BITS_TO_CLEAR. |
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*/ |
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child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) |
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& ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); |
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return retval; |
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} |
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asmlinkage long ia64_clone(unsigned long clone_flags, unsigned long stack_start, |
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unsigned long stack_size, unsigned long parent_tidptr, |
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unsigned long child_tidptr, unsigned long tls) |
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{ |
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struct kernel_clone_args args = { |
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.flags = (lower_32_bits(clone_flags) & ~CSIGNAL), |
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.pidfd = (int __user *)parent_tidptr, |
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.child_tid = (int __user *)child_tidptr, |
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.parent_tid = (int __user *)parent_tidptr, |
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.exit_signal = (lower_32_bits(clone_flags) & CSIGNAL), |
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.stack = stack_start, |
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.stack_size = stack_size, |
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.tls = tls, |
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}; |
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|
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return kernel_clone(&args); |
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} |
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|
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static void |
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do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg) |
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{ |
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unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm; |
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unsigned long ip; |
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elf_greg_t *dst = arg; |
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struct pt_regs *pt; |
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char nat; |
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int i; |
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memset(dst, 0, sizeof(elf_gregset_t)); /* don't leak any kernel bits to user-level */ |
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|
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if (unw_unwind_to_user(info) < 0) |
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return; |
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unw_get_sp(info, &sp); |
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pt = (struct pt_regs *) (sp + 16); |
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urbs_end = ia64_get_user_rbs_end(task, pt, &cfm); |
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|
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if (ia64_sync_user_rbs(task, info->sw, pt->ar_bspstore, urbs_end) < 0) |
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return; |
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|
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ia64_peek(task, info->sw, urbs_end, (long) ia64_rse_rnat_addr((long *) urbs_end), |
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&ar_rnat); |
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|
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/* |
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* coredump format: |
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* r0-r31 |
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* NaT bits (for r0-r31; bit N == 1 iff rN is a NaT) |
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* predicate registers (p0-p63) |
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* b0-b7 |
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* ip cfm user-mask |
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* ar.rsc ar.bsp ar.bspstore ar.rnat |
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* ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec |
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*/ |
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|
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/* r0 is zero */ |
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for (i = 1, mask = (1UL << i); i < 32; ++i) { |
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unw_get_gr(info, i, &dst[i], &nat); |
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if (nat) |
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nat_bits |= mask; |
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mask <<= 1; |
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} |
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dst[32] = nat_bits; |
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unw_get_pr(info, &dst[33]); |
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|
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for (i = 0; i < 8; ++i) |
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unw_get_br(info, i, &dst[34 + i]); |
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|
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unw_get_rp(info, &ip); |
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dst[42] = ip + ia64_psr(pt)->ri; |
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dst[43] = cfm; |
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dst[44] = pt->cr_ipsr & IA64_PSR_UM; |
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|
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unw_get_ar(info, UNW_AR_RSC, &dst[45]); |
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/* |
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* For bsp and bspstore, unw_get_ar() would return the kernel |
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* addresses, but we need the user-level addresses instead: |
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*/ |
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dst[46] = urbs_end; /* note: by convention PT_AR_BSP points to the end of the urbs! */ |
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dst[47] = pt->ar_bspstore; |
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dst[48] = ar_rnat; |
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unw_get_ar(info, UNW_AR_CCV, &dst[49]); |
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unw_get_ar(info, UNW_AR_UNAT, &dst[50]); |
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unw_get_ar(info, UNW_AR_FPSR, &dst[51]); |
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dst[52] = pt->ar_pfs; /* UNW_AR_PFS is == to pt->cr_ifs for interrupt frames */ |
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unw_get_ar(info, UNW_AR_LC, &dst[53]); |
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unw_get_ar(info, UNW_AR_EC, &dst[54]); |
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unw_get_ar(info, UNW_AR_CSD, &dst[55]); |
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unw_get_ar(info, UNW_AR_SSD, &dst[56]); |
|
} |
|
|
|
static void |
|
do_copy_regs (struct unw_frame_info *info, void *arg) |
|
{ |
|
do_copy_task_regs(current, info, arg); |
|
} |
|
|
|
void |
|
ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst) |
|
{ |
|
unw_init_running(do_copy_regs, dst); |
|
} |
|
|
|
/* |
|
* Flush thread state. This is called when a thread does an execve(). |
|
*/ |
|
void |
|
flush_thread (void) |
|
{ |
|
/* drop floating-point and debug-register state if it exists: */ |
|
current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID); |
|
ia64_drop_fpu(current); |
|
} |
|
|
|
/* |
|
* Clean up state associated with a thread. This is called when |
|
* the thread calls exit(). |
|
*/ |
|
void |
|
exit_thread (struct task_struct *tsk) |
|
{ |
|
|
|
ia64_drop_fpu(tsk); |
|
} |
|
|
|
unsigned long |
|
get_wchan (struct task_struct *p) |
|
{ |
|
struct unw_frame_info info; |
|
unsigned long ip; |
|
int count = 0; |
|
|
|
if (!p || p == current || p->state == TASK_RUNNING) |
|
return 0; |
|
|
|
/* |
|
* Note: p may not be a blocked task (it could be current or |
|
* another process running on some other CPU. Rather than |
|
* trying to determine if p is really blocked, we just assume |
|
* it's blocked and rely on the unwind routines to fail |
|
* gracefully if the process wasn't really blocked after all. |
|
* --davidm 99/12/15 |
|
*/ |
|
unw_init_from_blocked_task(&info, p); |
|
do { |
|
if (p->state == TASK_RUNNING) |
|
return 0; |
|
if (unw_unwind(&info) < 0) |
|
return 0; |
|
unw_get_ip(&info, &ip); |
|
if (!in_sched_functions(ip)) |
|
return ip; |
|
} while (count++ < 16); |
|
return 0; |
|
} |
|
|
|
void |
|
cpu_halt (void) |
|
{ |
|
pal_power_mgmt_info_u_t power_info[8]; |
|
unsigned long min_power; |
|
int i, min_power_state; |
|
|
|
if (ia64_pal_halt_info(power_info) != 0) |
|
return; |
|
|
|
min_power_state = 0; |
|
min_power = power_info[0].pal_power_mgmt_info_s.power_consumption; |
|
for (i = 1; i < 8; ++i) |
|
if (power_info[i].pal_power_mgmt_info_s.im |
|
&& power_info[i].pal_power_mgmt_info_s.power_consumption < min_power) { |
|
min_power = power_info[i].pal_power_mgmt_info_s.power_consumption; |
|
min_power_state = i; |
|
} |
|
|
|
while (1) |
|
ia64_pal_halt(min_power_state); |
|
} |
|
|
|
void machine_shutdown(void) |
|
{ |
|
smp_shutdown_nonboot_cpus(reboot_cpu); |
|
|
|
#ifdef CONFIG_KEXEC |
|
kexec_disable_iosapic(); |
|
#endif |
|
} |
|
|
|
void |
|
machine_restart (char *restart_cmd) |
|
{ |
|
(void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0); |
|
efi_reboot(REBOOT_WARM, NULL); |
|
} |
|
|
|
void |
|
machine_halt (void) |
|
{ |
|
(void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0); |
|
cpu_halt(); |
|
} |
|
|
|
void |
|
machine_power_off (void) |
|
{ |
|
if (pm_power_off) |
|
pm_power_off(); |
|
machine_halt(); |
|
} |
|
|
|
EXPORT_SYMBOL(ia64_delay_loop);
|
|
|