cregit-Linux how code gets into the kernel

Release 4.14 arch/ia64/kernel/process.c

Directory: arch/ia64/kernel
// SPDX-License-Identifier: GPL-2.0
/*
 * Architecture-specific setup.
 *
 * Copyright (C) 1998-2003 Hewlett-Packard Co
 *      David Mosberger-Tang <davidm@hpl.hp.com>
 * 04/11/17 Ashok Raj   <ashok.raj@intel.com> Added CPU Hotplug Support
 *
 * 2005-10-07 Keith Owens <kaos@sgi.com>
 *            Add notify_die() hooks.
 */
#include <linux/cpu.h>
#include <linux/pm.h>
#include <linux/elf.h>
#include <linux/errno.h>
#include <linux/kallsyms.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/personality.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/sched/hotplug.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
#include <linux/stddef.h>
#include <linux/thread_info.h>
#include <linux/unistd.h>
#include <linux/efi.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/kdebug.h>
#include <linux/utsname.h>
#include <linux/tracehook.h>
#include <linux/rcupdate.h>

#include <asm/cpu.h>
#include <asm/delay.h>
#include <asm/elf.h>
#include <asm/irq.h>
#include <asm/kexec.h>
#include <asm/pgalloc.h>
#include <asm/processor.h>
#include <asm/sal.h>
#include <asm/switch_to.h>
#include <asm/tlbflush.h>
#include <linux/uaccess.h>
#include <asm/unwind.h>
#include <asm/user.h>

#include "entry.h"

#ifdef CONFIG_PERFMON
# include <asm/perfmon.h>
#endif

#include "sigframe.h"


void (*ia64_mark_idle)(int);


unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;

EXPORT_SYMBOL(boot_option_idle_override);

void (*pm_power_off) (void);

EXPORT_SYMBOL(pm_power_off);



void

ia64_do_show_stack (struct unw_frame_info *info, void *arg)
{
	unsigned long ip, sp, bsp;
	char buf[128];			/* don't make it so big that it overflows the stack! */

	printk("\nCall Trace:\n");
	do {
		unw_get_ip(info, &ip);
		if (ip == 0)
			break;

		unw_get_sp(info, &sp);
		unw_get_bsp(info, &bsp);
		snprintf(buf, sizeof(buf),
			 " [<%016lx>] %%s\n"
			 "                                sp=%016lx bsp=%016lx\n",
			 ip, sp, bsp);
		print_symbol(buf, ip);
	} while (unw_unwind(info) >= 0);
}


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Linus Torvalds (pre-git)7875.00%125.00%


David Mosberger-Tang2625.00%375.00%


Total104100.00%4100.00%





void

show_stack (struct task_struct *task, unsigned long *sp)
{
	if (!task)
		unw_init_running(ia64_do_show_stack, NULL);
	else {
		struct unw_frame_info info;

		unw_init_from_blocked_task(&info, task);
		ia64_do_show_stack(&info, NULL);
	}
}


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Linus Torvalds (pre-git)4182.00%125.00%


David Mosberger-Tang918.00%375.00%


Total50100.00%4100.00%





void

show_regs (struct pt_regs *regs)
{
	unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri;

	print_modules();
	printk("\n");
	show_regs_print_info(KERN_DEFAULT);
	printk("psr : %016lx ifs : %016lx ip  : [<%016lx>]    %s (%s)\n",
	       regs->cr_ipsr, regs->cr_ifs, ip, print_tainted(),
	       init_utsname()->release);
	print_symbol("ip is at %s\n", ip);
	printk("unat: %016lx pfs : %016lx rsc : %016lx\n",
	       regs->ar_unat, regs->ar_pfs, regs->ar_rsc);
	printk("rnat: %016lx bsps: %016lx pr  : %016lx\n",
	       regs->ar_rnat, regs->ar_bspstore, regs->pr);
	printk("ldrs: %016lx ccv : %016lx fpsr: %016lx\n",
	       regs->loadrs, regs->ar_ccv, regs->ar_fpsr);
	printk("csd : %016lx ssd : %016lx\n", regs->ar_csd, regs->ar_ssd);
	printk("b0  : %016lx b6  : %016lx b7  : %016lx\n", regs->b0, regs->b6, regs->b7);
	printk("f6  : %05lx%016lx f7  : %05lx%016lx\n",
	       regs->f6.u.bits[1], regs->f6.u.bits[0],
	       regs->f7.u.bits[1], regs->f7.u.bits[0]);
	printk("f8  : %05lx%016lx f9  : %05lx%016lx\n",
	       regs->f8.u.bits[1], regs->f8.u.bits[0],
	       regs->f9.u.bits[1], regs->f9.u.bits[0]);
	printk("f10 : %05lx%016lx f11 : %05lx%016lx\n",
	       regs->f10.u.bits[1], regs->f10.u.bits[0],
	       regs->f11.u.bits[1], regs->f11.u.bits[0]);

	printk("r1  : %016lx r2  : %016lx r3  : %016lx\n", regs->r1, regs->r2, regs->r3);
	printk("r8  : %016lx r9  : %016lx r10 : %016lx\n", regs->r8, regs->r9, regs->r10);
	printk("r11 : %016lx r12 : %016lx r13 : %016lx\n", regs->r11, regs->r12, regs->r13);
	printk("r14 : %016lx r15 : %016lx r16 : %016lx\n", regs->r14, regs->r15, regs->r16);
	printk("r17 : %016lx r18 : %016lx r19 : %016lx\n", regs->r17, regs->r18, regs->r19);
	printk("r20 : %016lx r21 : %016lx r22 : %016lx\n", regs->r20, regs->r21, regs->r22);
	printk("r23 : %016lx r24 : %016lx r25 : %016lx\n", regs->r23, regs->r24, regs->r25);
	printk("r26 : %016lx r27 : %016lx r28 : %016lx\n", regs->r26, regs->r27, regs->r28);
	printk("r29 : %016lx r30 : %016lx r31 : %016lx\n", regs->r29, regs->r30, regs->r31);

	if (user_mode(regs)) {
		/* print the stacked registers */
		unsigned long val, *bsp, ndirty;
		int i, sof, is_nat = 0;

		sof = regs->cr_ifs & 0x7f;	/* size of frame */
		ndirty = (regs->loadrs >> 19);
		bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty);
		for (i = 0; i < sof; ++i) {
			get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i));
			printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val,
			       ((i == sof - 1) || (i % 3) == 2) ? "\n" : " ");
		}
	} else
		show_stack(NULL, NULL);
}


Contributors
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Linus Torvalds (pre-git)48081.08%16.67%


David Mosberger-Tang9315.71%960.00%


Linus Torvalds71.18%213.33%


Tony Luck61.01%16.67%


Tejun Heo50.84%16.67%


Alexey Dobriyan10.17%16.67%


Total592100.00%15100.00%



/* local support for deprecated console_print */


void

console_print(const char *s)
{
	printk(KERN_EMERG "%s", s);
}


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Anirban Sinha18100.00%1100.00%


Total18100.00%1100.00%





void

do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
{
	if (fsys_mode(current, &scr->pt)) {
		/*
                 * defer signal-handling etc. until we return to
                 * privilege-level 0.
                 */
		if (!ia64_psr(&scr->pt)->lp)
			ia64_psr(&scr->pt)->lp = 1;
		return;
	}

#ifdef CONFIG_PERFMON
	if (current->thread.pfm_needs_checking)
		/*
                 * Note: pfm_handle_work() allow us to call it with interrupts
                 * disabled, and may enable interrupts within the function.
                 */
		pfm_handle_work();
#endif

	/* deal with pending signal delivery */
	if (test_thread_flag(TIF_SIGPENDING)) {
		local_irq_enable();	/* force interrupt enable */
		ia64_do_signal(scr, in_syscall);
	}

	if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) {
		local_irq_enable();	/* force interrupt enable */
		tracehook_notify_resume(&scr->pt);
	}

	/* copy user rbs to kernel rbs */
	if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) {
		local_irq_enable();	/* force interrupt enable */
		ia64_sync_krbs();
	}

	local_irq_disable();	/* force interrupt disable */
}


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David Mosberger-Tang7653.90%220.00%


Hidetoshi Seto1812.77%110.00%


David Shaohua Li1712.06%110.00%


Petr Tesarik149.93%110.00%


Linus Torvalds (pre-git)96.38%220.00%


Tony Luck42.84%110.00%


Stéphane Eranian21.42%110.00%


Alexey Dobriyan10.71%110.00%


Total141100.00%10100.00%






static int __init nohalt_setup(char * str)
{
	cpu_idle_poll_ctrl(true);
	return 1;
}

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Kenneth W. Chen1578.95%150.00%


Thomas Gleixner421.05%150.00%


Total19100.00%2100.00%



__setup("nohalt", nohalt_setup);

#ifdef CONFIG_HOTPLUG_CPU
/* We don't actually take CPU down, just spin without interrupts. */



static inline void play_dead(void)
{
	unsigned int this_cpu = smp_processor_id();

	/* Ack it */
	__this_cpu_write(cpu_state, CPU_DEAD);

	max_xtp();
	local_irq_disable();
	idle_task_exit();
	ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]);
	/*
         * The above is a point of no-return, the processor is
         * expected to be in SAL loop now.
         */
	BUG();
}

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Andrew Morton2758.70%133.33%


Ashok Raj1634.78%133.33%


Christoph Lameter36.52%133.33%


Total46100.00%3100.00%



#else



static inline void play_dead(void)
{
	BUG();
}

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Andrew Morton12100.00%1100.00%


Total12100.00%1100.00%



#endif /* CONFIG_HOTPLUG_CPU */




void arch_cpu_idle_dead(void)
{
	play_dead();
}


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Thomas Gleixner880.00%150.00%


Linus Torvalds (pre-git)220.00%150.00%


Total10100.00%2100.00%






void arch_cpu_idle(void)
{
	void (*mark_idle)(int) = ia64_mark_idle;

#ifdef CONFIG_SMP
	min_xtp();
#endif
	rmb();
	if (mark_idle)
		(*mark_idle)(1);

	safe_halt();

	if (mark_idle)
		(*mark_idle)(0);
#ifdef CONFIG_SMP
	normal_xtp();
#endif
}


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Jes Sorensen2234.38%112.50%


Zwane Mwaikambo1523.44%337.50%


Nicholas Piggin914.06%112.50%


David Mosberger-Tang914.06%112.50%


Thomas Gleixner69.38%112.50%


Linus Torvalds (pre-git)34.69%112.50%


Total64100.00%8100.00%





void

ia64_save_extra (struct task_struct *task)
{
#ifdef CONFIG_PERFMON
	unsigned long info;
#endif

	if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
		ia64_save_debug_regs(&task->thread.dbr[0]);

#ifdef CONFIG_PERFMON
	if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0)
		pfm_save_regs(task);

	info = __this_cpu_read(pfm_syst_info);
	if (info & PFM_CPUINFO_SYST_WIDE)
		pfm_syst_wide_update_task(task, info, 0);
#endif
}


Contributors
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Linus Torvalds (pre-git)6065.22%337.50%


Stéphane Eranian2223.91%225.00%


David Mosberger-Tang88.70%112.50%


Linus Torvalds11.09%112.50%


Christoph Lameter11.09%112.50%


Total92100.00%8100.00%





void

ia64_load_extra (struct task_struct *task)
{
#ifdef CONFIG_PERFMON
	unsigned long info;
#endif

	if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
		ia64_load_debug_regs(&task->thread.dbr[0]);

#ifdef CONFIG_PERFMON
	if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0)
		pfm_load_regs(task);

	info = __this_cpu_read(pfm_syst_info);
	if (info & PFM_CPUINFO_SYST_WIDE) 
		pfm_syst_wide_update_task(task, info, 1);
#endif
}


Contributors
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Linus Torvalds (pre-git)6065.22%228.57%


Stéphane Eranian2223.91%228.57%


David Mosberger-Tang88.70%114.29%


Linus Torvalds11.09%114.29%


Christoph Lameter11.09%114.29%


Total92100.00%7100.00%



/*
 * Copy the state of an ia-64 thread.
 *
 * We get here through the following  call chain:
 *
 *      from user-level:        from kernel:
 *
 *      <clone syscall>         <some kernel call frames>
 *      sys_clone                  :
 *      do_fork                 do_fork
 *      copy_thread             copy_thread
 *
 * This means that the stack layout is as follows:
 *
 *      +---------------------+ (highest addr)
 *      |   struct pt_regs    |
 *      +---------------------+
 *      | struct switch_stack |
 *      +---------------------+
 *      |                     |
 *      |    memory stack     |
 *      |                     | <-- sp (lowest addr)
 *      +---------------------+
 *
 * Observe that we copy the unat values that are in pt_regs and switch_stack.  Spilling an
 * integer to address X causes bit N in ar.unat to be set to the NaT bit of the register,
 * with N=(X & 0x1ff)/8.  Thus, copying the unat value preserves the NaT bits ONLY if the
 * pt_regs structure in the parent is congruent to that of the child, modulo 512.  Since
 * the stack is page aligned and the page size is at least 4KB, this is always the case,
 * so there is nothing to worry about.
 */


int

copy_thread(unsigned long clone_flags,
	     unsigned long user_stack_base, unsigned long user_stack_size,
	     struct task_struct *p)
{
	extern char ia64_ret_from_clone;
	struct switch_stack *child_stack, *stack;
	unsigned long rbs, child_rbs, rbs_size;
	struct pt_regs *child_ptregs;
	struct pt_regs *regs = current_pt_regs();
	int retval = 0;

	child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1;
	child_stack = (struct switch_stack *) child_ptregs - 1;

	rbs = (unsigned long) current + IA64_RBS_OFFSET;
	child_rbs = (unsigned long) p + IA64_RBS_OFFSET;

	/* copy parts of thread_struct: */
	p->thread.ksp = (unsigned long) child_stack - 16;

	/*
         * NOTE: The calling convention considers all floating point
         * registers in the high partition (fph) to be scratch.  Since
         * the only way to get to this point is through a system call,
         * we know that the values in fph are all dead.  Hence, there
         * is no need to inherit the fph state from the parent to the
         * child and all we have to do is to make sure that
         * IA64_THREAD_FPH_VALID is cleared in the child.
         *
         * XXX We could push this optimization a bit further by
         * clearing IA64_THREAD_FPH_VALID on ANY system call.
         * However, it's not clear this is worth doing.  Also, it
         * would be a slight deviation from the normal Linux system
         * call behavior where scratch registers are preserved across
         * system calls (unless used by the system call itself).
         */

#	define THREAD_FLAGS_TO_CLEAR	(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID \
                                         | IA64_THREAD_PM_VALID)

#	define THREAD_FLAGS_TO_SET	0
	p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR)
			   | THREAD_FLAGS_TO_SET);

	ia64_drop_fpu(p);	/* don't pick up stale state from a CPU's fph */

	if (unlikely(p->flags & PF_KTHREAD)) {
		if (unlikely(!user_stack_base)) {
			/* fork_idle() called us */
			return 0;
		}
		memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack));
		child_stack->r4 = user_stack_base;	/* payload */
		child_stack->r5 = user_stack_size;	/* argument */
		/*
                 * Preserve PSR bits, except for bits 32-34 and 37-45,
                 * which we can't read.
                 */
		child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN;
		/* mark as valid, empty frame */
		child_ptregs->cr_ifs = 1UL << 63;
		child_stack->ar_fpsr = child_ptregs->ar_fpsr
			= ia64_getreg(_IA64_REG_AR_FPSR);
		child_stack->pr = (1 << PRED_KERNEL_STACK);
		child_stack->ar_bspstore = child_rbs;
		child_stack->b0 = (unsigned long) &ia64_ret_from_clone;

		/* stop some PSR bits from being inherited.
                 * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
                 * therefore we must specify them explicitly here and not include them in
                 * IA64_PSR_BITS_TO_CLEAR.
                 */
		child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
				 & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));

		return 0;
	}
	stack = ((struct switch_stack *) regs) - 1;
	/* copy parent's switch_stack & pt_regs to child: */
	memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack));

	/* copy the parent's register backing store to the child: */
	rbs_size = stack->ar_bspstore - rbs;
	memcpy((void *) child_rbs, (void *) rbs, rbs_size);
	if (clone_flags & CLONE_SETTLS)
		child_ptregs->r13 = regs->r16;	/* see sys_clone2() in entry.S */
	if (user_stack_base) {
		child_ptregs->r12 = user_stack_base + user_stack_size - 16;
		child_ptregs->ar_bspstore = user_stack_base;
		child_ptregs->ar_rnat = 0;
		child_ptregs->loadrs = 0;
	}
	child_stack->ar_bspstore = child_rbs + rbs_size;
	child_stack->b0 = (unsigned long) &ia64_ret_from_clone;

	/* stop some PSR bits from being inherited.
         * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
         * therefore we must specify them explicitly here and not include them in
         * IA64_PSR_BITS_TO_CLEAR.
         */
	child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
				 & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));

#ifdef CONFIG_PERFMON
	if (current->thread.pfm_context)
		pfm_inherit(p, child_ptregs);
#endif
	return retval;
}


Contributors
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Al Viro23348.24%321.43%


Linus Torvalds (pre-git)14730.43%428.57%


David Mosberger-Tang7214.91%428.57%


Linus Torvalds244.97%214.29%


Stéphane Eranian71.45%17.14%


Total483100.00%14100.00%





static void

do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg)
{
	unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm;
	unsigned long uninitialized_var(ip);	/* GCC be quiet */
	elf_greg_t *dst = arg;
	struct pt_regs *pt;
	char nat;
	int i;

	memset(dst, 0, sizeof(elf_gregset_t));	/* don't leak any kernel bits to user-level */

	if (unw_unwind_to_user(info) < 0)
		return;

	unw_get_sp(info, &sp);
	pt = (struct pt_regs *) (sp + 16);

	urbs_end = ia64_get_user_rbs_end(task, pt, &cfm);

	if (ia64_sync_user_rbs(task, info->sw, pt->ar_bspstore, urbs_end) < 0)
		return;

	ia64_peek(task, info->sw, urbs_end, (long) ia64_rse_rnat_addr((long *) urbs_end),
		  &ar_rnat);

	/*
         * coredump format:
         *      r0-r31
         *      NaT bits (for r0-r31; bit N == 1 iff rN is a NaT)
         *      predicate registers (p0-p63)
         *      b0-b7
         *      ip cfm user-mask
         *      ar.rsc ar.bsp ar.bspstore ar.rnat
         *      ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec
         */

	/* r0 is zero */
	for (i = 1, mask = (1UL << i); i < 32; ++i) {
		unw_get_gr(info, i, &dst[i], &nat);
		if (nat)
			nat_bits |= mask;
		mask <<= 1;
	}
	dst[32] = nat_bits;
	unw_get_pr(info, &dst[33]);

	for (i = 0; i < 8; ++i)
		unw_get_br(info, i, &dst[34 + i]);

	unw_get_rp(info, &ip);
	dst[42] = ip + ia64_psr(pt)->ri;
	dst[43] = cfm;
	dst[44] = pt->cr_ipsr & IA64_PSR_UM;

	unw_get_ar(info, UNW_AR_RSC, &dst[45]);
	/*
         * For bsp and bspstore, unw_get_ar() would return the kernel
         * addresses, but we need the user-level addresses instead:
         */
	dst[46] = urbs_end;	/* note: by convention PT_AR_BSP points to the end of the urbs! */
	dst[47] = pt->ar_bspstore;
	dst[48] = ar_rnat;
	unw_get_ar(info, UNW_AR_CCV, &dst[49]);
	unw_get_ar(info, UNW_AR_UNAT, &dst[50]);
	unw_get_ar(info, UNW_AR_FPSR, &dst[51]);
	dst[52] = pt->ar_pfs;	/* UNW_AR_PFS is == to pt->cr_ifs for interrupt frames */
	unw_get_ar(info, UNW_AR_LC, &dst[53]);
	unw_get_ar(info, UNW_AR_EC, &dst[54]);
	unw_get_ar(info, UNW_AR_CSD, &dst[55]);
	unw_get_ar(info, UNW_AR_SSD, &dst[56]);
}


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Linus Torvalds (pre-git)33375.51%337.50%


Linus Torvalds5211.79%225.00%


David Mosberger-Tang265.90%112.50%


Ingo Molnar224.99%112.50%


Jes Sorensen81.81%112.50%


Total441100.00%8100.00%





void

do_dump_task_fpu (struct task_struct *task, struct unw_frame_info *info, void *arg)
{
	elf_fpreg_t *dst = arg;
	int i;

	memset(dst, 0, sizeof(elf_fpregset_t));	/* don't leak any "random" bits */

	if (unw_unwind_to_user(info) < 0)
		return;

	/* f0 is 0.0, f1 is 1.0 */

	for (i = 2; i < 32; ++i)
		unw_get_fr(info, i, dst + i);

	ia64_flush_fph(task);
	if ((task->thread.flags & IA64_THREAD_FPH_VALID) != 0)
		memcpy(dst + 32, task->thread.fph, 96*16);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)10391.96%375.00%


Ingo Molnar98.04%125.00%


Total112100.00%4100.00%





void

do_copy_regs (struct unw_frame_info *info, void *arg)
{
	do_copy_task_regs(current, info, arg);
}


Contributors
PersonTokensPropCommitsCommitProp
David Mosberger-Tang23100.00%1100.00%


Total23100.00%1100.00%





void

do_dump_fpu (struct unw_frame_info *info, void *arg)
{
	do_dump_task_fpu(current, info, arg);
}


Contributors
PersonTokensPropCommitsCommitProp
David Mosberger-Tang23100.00%1100.00%


Total23100.00%1100.00%





void

ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst)
{
	unw_init_running(do_copy_regs, dst);
}


Contributors
PersonTokensPropCommitsCommitProp
David Mosberger-Tang20100.00%1100.00%


Total20100.00%1100.00%





int

dump_fpu (struct pt_regs *pt, elf_fpregset_t dst)
{
	unw_init_running(do_dump_fpu, dst);
	return 1;	/* f0-f31 are always valid so we always return 1 */
}


Contributors
PersonTokensPropCommitsCommitProp
David Mosberger-Tang2395.83%150.00%


Linus Torvalds14.17%150.00%


Total24100.00%2100.00%



/*
 * 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2492.31%150.00%


David Mosberger-Tang27.69%150.00%


Total26100.00%2100.00%



/*
 * 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);
#ifdef CONFIG_PERFMON
       /* if needed, stop monitoring and flush state to perfmon context */
	if (tsk->thread.pfm_context)
		pfm_exit_thread(tsk);

	/* free debug register resources */
	if (tsk->thread.flags & IA64_THREAD_DBG_VALID)
		pfm_release_debug_registers(tsk);
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2856.00%233.33%


David Mosberger-Tang1224.00%233.33%


Jiri Slaby918.00%116.67%


Stéphane Eranian12.00%116.67%


Total50100.00%6100.00%





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;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7669.72%250.00%


Robin Holt2926.61%125.00%


Andrew Morton43.67%125.00%


Total109100.00%4100.00%





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);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds10799.07%150.00%


Linus Torvalds (pre-git)10.93%150.00%


Total108100.00%2100.00%






void machine_shutdown(void)
{
#ifdef CONFIG_HOTPLUG_CPU
	int cpu;

	for_each_online_cpu(cpu) {
		if (cpu != smp_processor_id())
			cpu_down(cpu);
	}
#endif
#ifdef CONFIG_KEXEC
	kexec_disable_iosapic();
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
Simon Horman41100.00%1100.00%


Total41100.00%1100.00%





void

machine_restart (char *restart_cmd)
{
	(void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0);
	efi_reboot(REBOOT_WARM, NULL);
}


Contributors
PersonTokensPropCommitsCommitProp
Keith Owens1852.94%120.00%


Linus Torvalds (pre-git)1235.29%120.00%


Matt Fleming25.88%120.00%


Linus Torvalds12.94%120.00%


David Mosberger-Tang12.94%120.00%


Total34100.00%5100.00%





void

machine_halt (void)
{
	(void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0);
	cpu_halt();
}


Contributors
PersonTokensPropCommitsCommitProp
Keith Owens1864.29%133.33%


Linus Torvalds517.86%133.33%


Linus Torvalds (pre-git)517.86%133.33%


Total28100.00%3100.00%





void

machine_power_off (void)
{
	if (pm_power_off)
		pm_power_off();
	machine_halt();
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)952.94%133.33%


Linus Torvalds847.06%266.67%


Total17100.00%3100.00%




Overall Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)151751.15%78.64%


David Mosberger-Tang46115.54%2227.16%


Al Viro2337.86%33.70%


Linus Torvalds2087.01%56.17%


Andrew Morton652.19%22.47%


Stéphane Eranian541.82%44.94%


Simon Horman441.48%11.23%


Ingo Molnar431.45%56.17%


Keith Owens391.31%11.23%


Jes Sorensen391.31%22.47%


Robin Holt290.98%11.23%


Kenneth W. Chen220.74%11.23%


David Shaohua Li200.67%11.23%


Anirban Sinha190.64%11.23%


Hidetoshi Seto180.61%11.23%


Zwane Mwaikambo180.61%33.70%


Thomas Gleixner180.61%11.23%


Ashok Raj160.54%11.23%


Tony Luck160.54%33.70%


Alexander Chiang140.47%11.23%


Petr Tesarik140.47%11.23%


Tejun Heo100.34%22.47%


Jiri Slaby100.34%11.23%


Len Brown100.34%11.23%


Nicholas Piggin90.30%11.23%


Christoph Hellwig50.17%11.23%


Christoph Lameter50.17%11.23%


Paul E. McKenney30.10%11.23%


Matt Fleming20.07%11.23%


Alexey Dobriyan20.07%22.47%


Greg Kroah-Hartman10.03%11.23%


Thomas Renninger10.03%11.23%


Matt Domsch10.03%11.23%


Total2966100.00%81100.00%


Directory: arch/ia64/kernel



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