Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 800 insertions, 0 deletions

diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
new file mode 100644
index 00000000000..91293388dd2
--- /dev/null
+++ b/arch/ia64/kernel/process.c
@@ -0,0 +1,800 @@
+/*
+ * Architecture-specific setup.
+ *
+ * Copyright (C) 1998-2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+#define __KERNEL_SYSCALLS__	/* see <asm/unistd.h> */
+#include <linux/config.h>
+
+#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/module.h>
+#include <linux/notifier.h>
+#include <linux/personality.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.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 <asm/cpu.h>
+#include <asm/delay.h>
+#include <asm/elf.h>
+#include <asm/ia32.h>
+#include <asm/irq.h>
+#include <asm/pgalloc.h>
+#include <asm/processor.h>
+#include <asm/sal.h>
+#include <asm/tlbflush.h>
+#include <asm/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);
+static cpumask_t cpu_idle_map;
+
+unsigned long boot_option_idle_override = 0;
+EXPORT_SYMBOL(boot_option_idle_override);
+
+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);
+}
+
+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);
+	}
+}
+
+void
+dump_stack (void)
+{
+	show_stack(NULL, NULL);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
+void
+show_regs (struct pt_regs *regs)
+{
+	unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri;
+
+	print_modules();
+	printk("\nPid: %d, CPU %d, comm: %20s\n", current->pid, smp_processor_id(), current->comm);
+	printk("psr : %016lx ifs : %016lx ip  : [<%016lx>]    %s\n",
+	       regs->cr_ipsr, regs->cr_ifs, ip, print_tainted());
+	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);
+}
+
+void
+do_notify_resume_user (sigset_t *oldset, 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)
+		pfm_handle_work();
+#endif
+
+	/* deal with pending signal delivery */
+	if (test_thread_flag(TIF_SIGPENDING))
+		ia64_do_signal(oldset, scr, in_syscall);
+}
+
+static int pal_halt = 1;
+static int __init nohalt_setup(char * str)
+{
+	pal_halt = 0;
+	return 1;
+}
+__setup("nohalt", nohalt_setup);
+
+/*
+ * We use this if we don't have any better idle routine..
+ */
+void
+default_idle (void)
+{
+	unsigned long pmu_active = ia64_getreg(_IA64_REG_PSR) & (IA64_PSR_PP | IA64_PSR_UP);
+
+	while (!need_resched())
+		if (pal_halt && !pmu_active)
+			safe_halt();
+		else
+			cpu_relax();
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+/* We don't actually take CPU down, just spin without interrupts. */
+static inline void play_dead(void)
+{
+	extern void ia64_cpu_local_tick (void);
+	/* Ack it */
+	__get_cpu_var(cpu_state) = CPU_DEAD;
+
+	/* We shouldn't have to disable interrupts while dead, but
+	 * some interrupts just don't seem to go away, and this makes
+	 * it "work" for testing purposes. */
+	max_xtp();
+	local_irq_disable();
+	/* Death loop */
+	while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE)
+		cpu_relax();
+
+	/*
+	 * Enable timer interrupts from now on
+	 * Not required if we put processor in SAL_BOOT_RENDEZ mode.
+	 */
+	local_flush_tlb_all();
+	cpu_set(smp_processor_id(), cpu_online_map);
+	wmb();
+	ia64_cpu_local_tick ();
+	local_irq_enable();
+}
+#else
+static inline void play_dead(void)
+{
+	BUG();
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+
+void cpu_idle_wait(void)
+{
+        int cpu;
+        cpumask_t map;
+
+        for_each_online_cpu(cpu)
+                cpu_set(cpu, cpu_idle_map);
+
+        wmb();
+        do {
+                ssleep(1);
+                cpus_and(map, cpu_idle_map, cpu_online_map);
+        } while (!cpus_empty(map));
+}
+EXPORT_SYMBOL_GPL(cpu_idle_wait);
+
+void __attribute__((noreturn))
+cpu_idle (void)
+{
+	void (*mark_idle)(int) = ia64_mark_idle;
+	int cpu = smp_processor_id();
+
+	/* endless idle loop with no priority at all */
+	while (1) {
+#ifdef CONFIG_SMP
+		if (!need_resched())
+			min_xtp();
+#endif
+		while (!need_resched()) {
+			void (*idle)(void);
+
+			if (mark_idle)
+				(*mark_idle)(1);
+
+			if (cpu_isset(cpu, cpu_idle_map))
+				cpu_clear(cpu, cpu_idle_map);
+			rmb();
+			idle = pm_idle;
+			if (!idle)
+				idle = default_idle;
+			(*idle)();
+		}
+
+		if (mark_idle)
+			(*mark_idle)(0);
+
+#ifdef CONFIG_SMP
+		normal_xtp();
+#endif
+		schedule();
+		check_pgt_cache();
+		if (cpu_is_offline(smp_processor_id()))
+			play_dead();
+	}
+}
+
+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 = __get_cpu_var(pfm_syst_info);
+	if (info & PFM_CPUINFO_SYST_WIDE)
+		pfm_syst_wide_update_task(task, info, 0);
+#endif
+
+#ifdef CONFIG_IA32_SUPPORT
+	if (IS_IA32_PROCESS(ia64_task_regs(task)))
+		ia32_save_state(task);
+#endif
+}
+
+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 = __get_cpu_var(pfm_syst_info);
+	if (info & PFM_CPUINFO_SYST_WIDE) 
+		pfm_syst_wide_update_task(task, info, 1);
+#endif
+
+#ifdef CONFIG_IA32_SUPPORT
+	if (IS_IA32_PROCESS(ia64_task_regs(task)))
+		ia32_load_state(task);
+#endif
+}
+
+/*
+ * 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 (int nr, unsigned long clone_flags,
+	     unsigned long user_stack_base, unsigned long user_stack_size,
+	     struct task_struct *p, struct pt_regs *regs)
+{
+	extern char ia64_ret_from_clone, ia32_ret_from_clone;
+	struct switch_stack *child_stack, *stack;
+	unsigned long rbs, child_rbs, rbs_size;
+	struct pt_regs *child_ptregs;
+	int retval = 0;
+
+#ifdef CONFIG_SMP
+	/*
+	 * For SMP idle threads, fork_by_hand() calls do_fork with
+	 * NULL regs.
+	 */
+	if (!regs)
+		return 0;
+#endif
+
+	stack = ((struct switch_stack *) regs) - 1;
+
+	child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1;
+	child_stack = (struct switch_stack *) child_ptregs - 1;
+
+	/* copy parent's switch_stack & pt_regs to child: */
+	memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack));
+
+	rbs = (unsigned long) current + IA64_RBS_OFFSET;
+	child_rbs = (unsigned long) p + IA64_RBS_OFFSET;
+	rbs_size = stack->ar_bspstore - rbs;
+
+	/* copy the parent's register backing store to the child: */
+	memcpy((void *) child_rbs, (void *) rbs, rbs_size);
+
+	if (likely(user_mode(child_ptregs))) {
+		if ((clone_flags & CLONE_SETTLS) && !IS_IA32_PROCESS(regs))
+			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;
+		}
+	} else {
+		/*
+		 * Note: we simply preserve the relative position of
+		 * the stack pointer here.  There is no need to
+		 * allocate a scratch area here, since that will have
+		 * been taken care of by the caller of sys_clone()
+		 * already.
+		 */
+		child_ptregs->r12 = (unsigned long) child_ptregs - 16; /* kernel sp */
+		child_ptregs->r13 = (unsigned long) p;		/* set `current' pointer */
+	}
+	child_stack->ar_bspstore = child_rbs + rbs_size;
+	if (IS_IA32_PROCESS(regs))
+		child_stack->b0 = (unsigned long) &ia32_ret_from_clone;
+	else
+		child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
+
+	/* copy parts of thread_struct: */
+	p->thread.ksp = (unsigned long) child_stack - 16;
+
+	/* 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));
+
+	/*
+	 * 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 */
+#ifdef CONFIG_IA32_SUPPORT
+	/*
+	 * If we're cloning an IA32 task then save the IA32 extra
+	 * state from the current task to the new task
+	 */
+	if (IS_IA32_PROCESS(ia64_task_regs(current))) {
+		ia32_save_state(p);
+		if (clone_flags & CLONE_SETTLS)
+			retval = ia32_clone_tls(p, child_ptregs);
+
+		/* Copy partially mapped page list */
+		if (!retval)
+			retval = ia32_copy_partial_page_list(p, clone_flags);
+	}
+#endif
+
+#ifdef CONFIG_PERFMON
+	if (current->thread.pfm_context)
+		pfm_inherit(p, child_ptregs);
+#endif
+	return retval;
+}
+
+static void
+do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg)
+{
+	unsigned long mask, sp, nat_bits = 0, ip, ar_rnat, urbs_end, cfm;
+	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]);
+}
+
+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);
+}
+
+void
+do_copy_regs (struct unw_frame_info *info, void *arg)
+{
+	do_copy_task_regs(current, info, arg);
+}
+
+void
+do_dump_fpu (struct unw_frame_info *info, void *arg)
+{
+	do_dump_task_fpu(current, info, arg);
+}
+
+int
+dump_task_regs(struct task_struct *task, elf_gregset_t *regs)
+{
+	struct unw_frame_info tcore_info;
+
+	if (current == task) {
+		unw_init_running(do_copy_regs, regs);
+	} else {
+		memset(&tcore_info, 0, sizeof(tcore_info));
+		unw_init_from_blocked_task(&tcore_info, task);
+		do_copy_task_regs(task, &tcore_info, regs);
+	}
+	return 1;
+}
+
+void
+ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst)
+{
+	unw_init_running(do_copy_regs, dst);
+}
+
+int
+dump_task_fpu (struct task_struct *task, elf_fpregset_t *dst)
+{
+	struct unw_frame_info tcore_info;
+
+	if (current == task) {
+		unw_init_running(do_dump_fpu, dst);
+	} else {
+		memset(&tcore_info, 0, sizeof(tcore_info));
+		unw_init_from_blocked_task(&tcore_info, task);
+		do_dump_task_fpu(task, &tcore_info, dst);
+	}
+	return 1;
+}
+
+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 */
+}
+
+long
+sys_execve (char __user *filename, char __user * __user *argv, char __user * __user *envp,
+	    struct pt_regs *regs)
+{
+	char *fname;
+	int error;
+
+	fname = getname(filename);
+	error = PTR_ERR(fname);
+	if (IS_ERR(fname))
+		goto out;
+	error = do_execve(fname, argv, envp, regs);
+	putname(fname);
+out:
+	return error;
+}
+
+pid_t
+kernel_thread (int (*fn)(void *), void *arg, unsigned long flags)
+{
+	extern void start_kernel_thread (void);
+	unsigned long *helper_fptr = (unsigned long *) &start_kernel_thread;
+	struct {
+		struct switch_stack sw;
+		struct pt_regs pt;
+	} regs;
+
+	memset(&regs, 0, sizeof(regs));
+	regs.pt.cr_iip = helper_fptr[0];	/* set entry point (IP) */
+	regs.pt.r1 = helper_fptr[1];		/* set GP */
+	regs.pt.r9 = (unsigned long) fn;	/* 1st argument */
+	regs.pt.r11 = (unsigned long) arg;	/* 2nd argument */
+	/* Preserve PSR bits, except for bits 32-34 and 37-45, which we can't read.  */
+	regs.pt.cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN;
+	regs.pt.cr_ifs = 1UL << 63;		/* mark as valid, empty frame */
+	regs.sw.ar_fpsr = regs.pt.ar_fpsr = ia64_getreg(_IA64_REG_AR_FPSR);
+	regs.sw.ar_bspstore = (unsigned long) current + IA64_RBS_OFFSET;
+	regs.sw.pr = (1 << PRED_KERNEL_STACK);
+	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs.pt, 0, NULL, NULL);
+}
+EXPORT_SYMBOL(kernel_thread);
+
+/* This gets called from kernel_thread() via ia64_invoke_thread_helper().  */
+int
+kernel_thread_helper (int (*fn)(void *), void *arg)
+{
+#ifdef CONFIG_IA32_SUPPORT
+	if (IS_IA32_PROCESS(ia64_task_regs(current))) {
+		/* A kernel thread is always a 64-bit process. */
+		current->thread.map_base  = DEFAULT_MAP_BASE;
+		current->thread.task_size = DEFAULT_TASK_SIZE;
+		ia64_set_kr(IA64_KR_IO_BASE, current->thread.old_iob);
+		ia64_set_kr(IA64_KR_TSSD, current->thread.old_k1);
+	}
+#endif
+	return (*fn)(arg);
+}
+
+/*
+ * 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);
+	if (IS_IA32_PROCESS(ia64_task_regs(current)))
+		ia32_drop_partial_page_list(current);
+}
+
+/*
+ * Clean up state associated with current thread.  This is called when
+ * the thread calls exit().
+ */
+void
+exit_thread (void)
+{
+	ia64_drop_fpu(current);
+#ifdef CONFIG_PERFMON
+       /* if needed, stop monitoring and flush state to perfmon context */
+	if (current->thread.pfm_context)
+		pfm_exit_thread(current);
+
+	/* free debug register resources */
+	if (current->thread.flags & IA64_THREAD_DBG_VALID)
+		pfm_release_debug_registers(current);
+#endif
+	if (IS_IA32_PROCESS(ia64_task_regs(current)))
+		ia32_drop_partial_page_list(current);
+}
+
+unsigned long
+get_wchan (struct task_struct *p)
+{
+	struct unw_frame_info info;
+	unsigned long ip;
+	int count = 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 (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_restart (char *restart_cmd)
+{
+	(*efi.reset_system)(EFI_RESET_WARM, 0, 0, NULL);
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+void
+machine_halt (void)
+{
+	cpu_halt();
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+void
+machine_power_off (void)
+{
+	if (pm_power_off)
+		pm_power_off();
+	machine_halt();
+}
+
+EXPORT_SYMBOL(machine_power_off);