Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b4f127b931e66aeb4740d2cff36bc2e893af427e
Commit:     b4f127b931e66aeb4740d2cff36bc2e893af427e
Parent:     e012a7b6000a955f1d706cab288e938207c74ba7
Author:     Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 11 11:13:05 2007 +0200
Committer:  Thomas Gleixner <[EMAIL PROTECTED]>
CommitDate: Thu Oct 11 11:13:05 2007 +0200

    i386: prepare shared kernel/process.c
    
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
 arch/i386/kernel/Makefile     |    2 +-
 arch/i386/kernel/process.c    |  951 -----------------------------------------
 arch/i386/kernel/process_32.c |  951 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 952 insertions(+), 952 deletions(-)

diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile
index 71138e9..1efdb47 100644
--- a/arch/i386/kernel/Makefile
+++ b/arch/i386/kernel/Makefile
@@ -4,7 +4,7 @@
 
 extra-y := head.o init_task_32.o vmlinux.lds
 
-obj-y  := process.o signal_32.o entry.o traps_32.o irq_32.o \
+obj-y  := process_32.o signal_32.o entry.o traps_32.o irq_32.o \
                ptrace_32.o time_32.o ioport_32.o ldt_32.o setup_32.o 
i8259_32.o sys_i386_32.o \
                pci-dma_32.o i386_ksyms_32.o i387_32.o bootflag.o e820_32.o\
                quirks.o i8237.o topology.o alternative.o i8253_32.o tsc.o
diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
deleted file mode 100644
index 8466471..0000000
--- a/arch/i386/kernel/process.c
+++ /dev/null
@@ -1,951 +0,0 @@
-/*
- *  linux/arch/i386/kernel/process.c
- *
- *  Copyright (C) 1995  Linus Torvalds
- *
- *  Pentium III FXSR, SSE support
- *     Gareth Hughes <[EMAIL PROTECTED]>, May 2000
- */
-
-/*
- * This file handles the architecture-dependent parts of process handling..
- */
-
-#include <stdarg.h>
-
-#include <linux/cpu.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/fs.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/elfcore.h>
-#include <linux/smp.h>
-#include <linux/stddef.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-#include <linux/user.h>
-#include <linux/a.out.h>
-#include <linux/interrupt.h>
-#include <linux/utsname.h>
-#include <linux/delay.h>
-#include <linux/reboot.h>
-#include <linux/init.h>
-#include <linux/mc146818rtc.h>
-#include <linux/module.h>
-#include <linux/kallsyms.h>
-#include <linux/ptrace.h>
-#include <linux/random.h>
-#include <linux/personality.h>
-#include <linux/tick.h>
-#include <linux/percpu.h>
-
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/ldt.h>
-#include <asm/processor.h>
-#include <asm/i387.h>
-#include <asm/desc.h>
-#include <asm/vm86.h>
-#ifdef CONFIG_MATH_EMULATION
-#include <asm/math_emu.h>
-#endif
-
-#include <linux/err.h>
-
-#include <asm/tlbflush.h>
-#include <asm/cpu.h>
-
-asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
-
-static int hlt_counter;
-
-unsigned long boot_option_idle_override = 0;
-EXPORT_SYMBOL(boot_option_idle_override);
-
-DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task;
-EXPORT_PER_CPU_SYMBOL(current_task);
-
-DEFINE_PER_CPU(int, cpu_number);
-EXPORT_PER_CPU_SYMBOL(cpu_number);
-
-/*
- * Return saved PC of a blocked thread.
- */
-unsigned long thread_saved_pc(struct task_struct *tsk)
-{
-       return ((unsigned long *)tsk->thread.esp)[3];
-}
-
-/*
- * Powermanagement idle function, if any..
- */
-void (*pm_idle)(void);
-EXPORT_SYMBOL(pm_idle);
-static DEFINE_PER_CPU(unsigned int, cpu_idle_state);
-
-void disable_hlt(void)
-{
-       hlt_counter++;
-}
-
-EXPORT_SYMBOL(disable_hlt);
-
-void enable_hlt(void)
-{
-       hlt_counter--;
-}
-
-EXPORT_SYMBOL(enable_hlt);
-
-/*
- * We use this if we don't have any better
- * idle routine..
- */
-void default_idle(void)
-{
-       if (!hlt_counter && boot_cpu_data.hlt_works_ok) {
-               current_thread_info()->status &= ~TS_POLLING;
-               /*
-                * TS_POLLING-cleared state must be visible before we
-                * test NEED_RESCHED:
-                */
-               smp_mb();
-
-               local_irq_disable();
-               if (!need_resched())
-                       safe_halt();    /* enables interrupts racelessly */
-               else
-                       local_irq_enable();
-               current_thread_info()->status |= TS_POLLING;
-       } else {
-               /* loop is done by the caller */
-               cpu_relax();
-       }
-}
-#ifdef CONFIG_APM_MODULE
-EXPORT_SYMBOL(default_idle);
-#endif
-
-/*
- * On SMP it's slightly faster (but much more power-consuming!)
- * to poll the ->work.need_resched flag instead of waiting for the
- * cross-CPU IPI to arrive. Use this option with caution.
- */
-static void poll_idle (void)
-{
-       cpu_relax();
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-#include <asm/nmi.h>
-/* We don't actually take CPU down, just spin without interrupts. */
-static inline void play_dead(void)
-{
-       /* This must be done before dead CPU ack */
-       cpu_exit_clear();
-       wbinvd();
-       mb();
-       /* Ack it */
-       __get_cpu_var(cpu_state) = CPU_DEAD;
-
-       /*
-        * With physical CPU hotplug, we should halt the cpu
-        */
-       local_irq_disable();
-       while (1)
-               halt();
-}
-#else
-static inline void play_dead(void)
-{
-       BUG();
-}
-#endif /* CONFIG_HOTPLUG_CPU */
-
-/*
- * The idle thread. There's no useful work to be
- * done, so just try to conserve power and have a
- * low exit latency (ie sit in a loop waiting for
- * somebody to say that they'd like to reschedule)
- */
-void cpu_idle(void)
-{
-       int cpu = smp_processor_id();
-
-       current_thread_info()->status |= TS_POLLING;
-
-       /* endless idle loop with no priority at all */
-       while (1) {
-               tick_nohz_stop_sched_tick();
-               while (!need_resched()) {
-                       void (*idle)(void);
-
-                       if (__get_cpu_var(cpu_idle_state))
-                               __get_cpu_var(cpu_idle_state) = 0;
-
-                       check_pgt_cache();
-                       rmb();
-                       idle = pm_idle;
-
-                       if (!idle)
-                               idle = default_idle;
-
-                       if (cpu_is_offline(cpu))
-                               play_dead();
-
-                       __get_cpu_var(irq_stat).idle_timestamp = jiffies;
-                       idle();
-               }
-               tick_nohz_restart_sched_tick();
-               preempt_enable_no_resched();
-               schedule();
-               preempt_disable();
-       }
-}
-
-void cpu_idle_wait(void)
-{
-       unsigned int cpu, this_cpu = get_cpu();
-       cpumask_t map, tmp = current->cpus_allowed;
-
-       set_cpus_allowed(current, cpumask_of_cpu(this_cpu));
-       put_cpu();
-
-       cpus_clear(map);
-       for_each_online_cpu(cpu) {
-               per_cpu(cpu_idle_state, cpu) = 1;
-               cpu_set(cpu, map);
-       }
-
-       __get_cpu_var(cpu_idle_state) = 0;
-
-       wmb();
-       do {
-               ssleep(1);
-               for_each_online_cpu(cpu) {
-                       if (cpu_isset(cpu, map) && !per_cpu(cpu_idle_state, 
cpu))
-                               cpu_clear(cpu, map);
-               }
-               cpus_and(map, map, cpu_online_map);
-       } while (!cpus_empty(map));
-
-       set_cpus_allowed(current, tmp);
-}
-EXPORT_SYMBOL_GPL(cpu_idle_wait);
-
-/*
- * This uses new MONITOR/MWAIT instructions on P4 processors with PNI,
- * which can obviate IPI to trigger checking of need_resched.
- * We execute MONITOR against need_resched and enter optimized wait state
- * through MWAIT. Whenever someone changes need_resched, we would be woken
- * up from MWAIT (without an IPI).
- *
- * New with Core Duo processors, MWAIT can take some hints based on CPU
- * capability.
- */
-void mwait_idle_with_hints(unsigned long eax, unsigned long ecx)
-{
-       if (!need_resched()) {
-               __monitor((void *)&current_thread_info()->flags, 0, 0);
-               smp_mb();
-               if (!need_resched())
-                       __mwait(eax, ecx);
-       }
-}
-
-/* Default MONITOR/MWAIT with no hints, used for default C1 state */
-static void mwait_idle(void)
-{
-       local_irq_enable();
-       mwait_idle_with_hints(0, 0);
-}
-
-void __devinit select_idle_routine(const struct cpuinfo_x86 *c)
-{
-       if (cpu_has(c, X86_FEATURE_MWAIT)) {
-               printk("monitor/mwait feature present.\n");
-               /*
-                * Skip, if setup has overridden idle.
-                * One CPU supports mwait => All CPUs supports mwait
-                */
-               if (!pm_idle) {
-                       printk("using mwait in idle threads.\n");
-                       pm_idle = mwait_idle;
-               }
-       }
-}
-
-static int __init idle_setup(char *str)
-{
-       if (!strcmp(str, "poll")) {
-               printk("using polling idle threads.\n");
-               pm_idle = poll_idle;
-#ifdef CONFIG_X86_SMP
-               if (smp_num_siblings > 1)
-                       printk("WARNING: polling idle and HT enabled, 
performance may degrade.\n");
-#endif
-       } else if (!strcmp(str, "mwait"))
-               force_mwait = 1;
-       else
-               return -1;
-
-       boot_option_idle_override = 1;
-       return 0;
-}
-early_param("idle", idle_setup);
-
-void show_regs(struct pt_regs * regs)
-{
-       unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;
-       unsigned long d0, d1, d2, d3, d6, d7;
-
-       printk("\n");
-       printk("Pid: %d, comm: %20s\n", current->pid, current->comm);
-       printk("EIP: %04x:[<%08lx>] CPU: %d\n",0xffff & regs->xcs,regs->eip, 
smp_processor_id());
-       print_symbol("EIP is at %s\n", regs->eip);
-
-       if (user_mode_vm(regs))
-               printk(" ESP: %04x:%08lx",0xffff & regs->xss,regs->esp);
-       printk(" EFLAGS: %08lx    %s  (%s %.*s)\n",
-              regs->eflags, print_tainted(), init_utsname()->release,
-              (int)strcspn(init_utsname()->version, " "),
-              init_utsname()->version);
-       printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
-               regs->eax,regs->ebx,regs->ecx,regs->edx);
-       printk("ESI: %08lx EDI: %08lx EBP: %08lx",
-               regs->esi, regs->edi, regs->ebp);
-       printk(" DS: %04x ES: %04x FS: %04x\n",
-              0xffff & regs->xds,0xffff & regs->xes, 0xffff & regs->xfs);
-
-       cr0 = read_cr0();
-       cr2 = read_cr2();
-       cr3 = read_cr3();
-       cr4 = read_cr4_safe();
-       printk("CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n", cr0, cr2, cr3, 
cr4);
-
-       get_debugreg(d0, 0);
-       get_debugreg(d1, 1);
-       get_debugreg(d2, 2);
-       get_debugreg(d3, 3);
-       printk("DR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
-                       d0, d1, d2, d3);
-       get_debugreg(d6, 6);
-       get_debugreg(d7, 7);
-       printk("DR6: %08lx DR7: %08lx\n", d6, d7);
-
-       show_trace(NULL, regs, &regs->esp);
-}
-
-/*
- * This gets run with %ebx containing the
- * function to call, and %edx containing
- * the "args".
- */
-extern void kernel_thread_helper(void);
-
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
-       struct pt_regs regs;
-
-       memset(&regs, 0, sizeof(regs));
-
-       regs.ebx = (unsigned long) fn;
-       regs.edx = (unsigned long) arg;
-
-       regs.xds = __USER_DS;
-       regs.xes = __USER_DS;
-       regs.xfs = __KERNEL_PERCPU;
-       regs.orig_eax = -1;
-       regs.eip = (unsigned long) kernel_thread_helper;
-       regs.xcs = __KERNEL_CS | get_kernel_rpl();
-       regs.eflags = X86_EFLAGS_IF | X86_EFLAGS_SF | X86_EFLAGS_PF | 0x2;
-
-       /* Ok, create the new process.. */
-       return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, 
NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
-/*
- * Free current thread data structures etc..
- */
-void exit_thread(void)
-{
-       /* The process may have allocated an io port bitmap... nuke it. */
-       if (unlikely(test_thread_flag(TIF_IO_BITMAP))) {
-               struct task_struct *tsk = current;
-               struct thread_struct *t = &tsk->thread;
-               int cpu = get_cpu();
-               struct tss_struct *tss = &per_cpu(init_tss, cpu);
-
-               kfree(t->io_bitmap_ptr);
-               t->io_bitmap_ptr = NULL;
-               clear_thread_flag(TIF_IO_BITMAP);
-               /*
-                * Careful, clear this in the TSS too:
-                */
-               memset(tss->io_bitmap, 0xff, tss->io_bitmap_max);
-               t->io_bitmap_max = 0;
-               tss->io_bitmap_owner = NULL;
-               tss->io_bitmap_max = 0;
-               tss->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET;
-               put_cpu();
-       }
-}
-
-void flush_thread(void)
-{
-       struct task_struct *tsk = current;
-
-       memset(tsk->thread.debugreg, 0, sizeof(unsigned long)*8);
-       memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));        
-       clear_tsk_thread_flag(tsk, TIF_DEBUG);
-       /*
-        * Forget coprocessor state..
-        */
-       clear_fpu(tsk);
-       clear_used_math();
-}
-
-void release_thread(struct task_struct *dead_task)
-{
-       BUG_ON(dead_task->mm);
-       release_vm86_irqs(dead_task);
-}
-
-/*
- * This gets called before we allocate a new thread and copy
- * the current task into it.
- */
-void prepare_to_copy(struct task_struct *tsk)
-{
-       unlazy_fpu(tsk);
-}
-
-int copy_thread(int nr, unsigned long clone_flags, unsigned long esp,
-       unsigned long unused,
-       struct task_struct * p, struct pt_regs * regs)
-{
-       struct pt_regs * childregs;
-       struct task_struct *tsk;
-       int err;
-
-       childregs = task_pt_regs(p);
-       *childregs = *regs;
-       childregs->eax = 0;
-       childregs->esp = esp;
-
-       p->thread.esp = (unsigned long) childregs;
-       p->thread.esp0 = (unsigned long) (childregs+1);
-
-       p->thread.eip = (unsigned long) ret_from_fork;
-
-       savesegment(gs,p->thread.gs);
-
-       tsk = current;
-       if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) {
-               p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr,
-                                               IO_BITMAP_BYTES, GFP_KERNEL);
-               if (!p->thread.io_bitmap_ptr) {
-                       p->thread.io_bitmap_max = 0;
-                       return -ENOMEM;
-               }
-               set_tsk_thread_flag(p, TIF_IO_BITMAP);
-       }
-
-       /*
-        * Set a new TLS for the child thread?
-        */
-       if (clone_flags & CLONE_SETTLS) {
-               struct desc_struct *desc;
-               struct user_desc info;
-               int idx;
-
-               err = -EFAULT;
-               if (copy_from_user(&info, (void __user *)childregs->esi, 
sizeof(info)))
-                       goto out;
-               err = -EINVAL;
-               if (LDT_empty(&info))
-                       goto out;
-
-               idx = info.entry_number;
-               if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
-                       goto out;
-
-               desc = p->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;
-               desc->a = LDT_entry_a(&info);
-               desc->b = LDT_entry_b(&info);
-       }
-
-       err = 0;
- out:
-       if (err && p->thread.io_bitmap_ptr) {
-               kfree(p->thread.io_bitmap_ptr);
-               p->thread.io_bitmap_max = 0;
-       }
-       return err;
-}
-
-/*
- * fill in the user structure for a core dump..
- */
-void dump_thread(struct pt_regs * regs, struct user * dump)
-{
-       int i;
-
-/* changed the size calculations - should hopefully work better. lbt */
-       dump->magic = CMAGIC;
-       dump->start_code = 0;
-       dump->start_stack = regs->esp & ~(PAGE_SIZE - 1);
-       dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
-       dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))) >> 
PAGE_SHIFT;
-       dump->u_dsize -= dump->u_tsize;
-       dump->u_ssize = 0;
-       for (i = 0; i < 8; i++)
-               dump->u_debugreg[i] = current->thread.debugreg[i];  
-
-       if (dump->start_stack < TASK_SIZE)
-               dump->u_ssize = ((unsigned long) (TASK_SIZE - 
dump->start_stack)) >> PAGE_SHIFT;
-
-       dump->regs.ebx = regs->ebx;
-       dump->regs.ecx = regs->ecx;
-       dump->regs.edx = regs->edx;
-       dump->regs.esi = regs->esi;
-       dump->regs.edi = regs->edi;
-       dump->regs.ebp = regs->ebp;
-       dump->regs.eax = regs->eax;
-       dump->regs.ds = regs->xds;
-       dump->regs.es = regs->xes;
-       dump->regs.fs = regs->xfs;
-       savesegment(gs,dump->regs.gs);
-       dump->regs.orig_eax = regs->orig_eax;
-       dump->regs.eip = regs->eip;
-       dump->regs.cs = regs->xcs;
-       dump->regs.eflags = regs->eflags;
-       dump->regs.esp = regs->esp;
-       dump->regs.ss = regs->xss;
-
-       dump->u_fpvalid = dump_fpu (regs, &dump->i387);
-}
-EXPORT_SYMBOL(dump_thread);
-
-/* 
- * Capture the user space registers if the task is not running (in user space)
- */
-int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
-{
-       struct pt_regs ptregs = *task_pt_regs(tsk);
-       ptregs.xcs &= 0xffff;
-       ptregs.xds &= 0xffff;
-       ptregs.xes &= 0xffff;
-       ptregs.xss &= 0xffff;
-
-       elf_core_copy_regs(regs, &ptregs);
-
-       return 1;
-}
-
-#ifdef CONFIG_SECCOMP
-void hard_disable_TSC(void)
-{
-       write_cr4(read_cr4() | X86_CR4_TSD);
-}
-void disable_TSC(void)
-{
-       preempt_disable();
-       if (!test_and_set_thread_flag(TIF_NOTSC))
-               /*
-                * Must flip the CPU state synchronously with
-                * TIF_NOTSC in the current running context.
-                */
-               hard_disable_TSC();
-       preempt_enable();
-}
-void hard_enable_TSC(void)
-{
-       write_cr4(read_cr4() & ~X86_CR4_TSD);
-}
-#endif /* CONFIG_SECCOMP */
-
-static noinline void
-__switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
-                struct tss_struct *tss)
-{
-       struct thread_struct *next;
-
-       next = &next_p->thread;
-
-       if (test_tsk_thread_flag(next_p, TIF_DEBUG)) {
-               set_debugreg(next->debugreg[0], 0);
-               set_debugreg(next->debugreg[1], 1);
-               set_debugreg(next->debugreg[2], 2);
-               set_debugreg(next->debugreg[3], 3);
-               /* no 4 and 5 */
-               set_debugreg(next->debugreg[6], 6);
-               set_debugreg(next->debugreg[7], 7);
-       }
-
-#ifdef CONFIG_SECCOMP
-       if (test_tsk_thread_flag(prev_p, TIF_NOTSC) ^
-           test_tsk_thread_flag(next_p, TIF_NOTSC)) {
-               /* prev and next are different */
-               if (test_tsk_thread_flag(next_p, TIF_NOTSC))
-                       hard_disable_TSC();
-               else
-                       hard_enable_TSC();
-       }
-#endif
-
-       if (!test_tsk_thread_flag(next_p, TIF_IO_BITMAP)) {
-               /*
-                * Disable the bitmap via an invalid offset. We still cache
-                * the previous bitmap owner and the IO bitmap contents:
-                */
-               tss->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET;
-               return;
-       }
-
-       if (likely(next == tss->io_bitmap_owner)) {
-               /*
-                * Previous owner of the bitmap (hence the bitmap content)
-                * matches the next task, we dont have to do anything but
-                * to set a valid offset in the TSS:
-                */
-               tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET;
-               return;
-       }
-       /*
-        * Lazy TSS's I/O bitmap copy. We set an invalid offset here
-        * and we let the task to get a GPF in case an I/O instruction
-        * is performed.  The handler of the GPF will verify that the
-        * faulting task has a valid I/O bitmap and, it true, does the
-        * real copy and restart the instruction.  This will save us
-        * redundant copies when the currently switched task does not
-        * perform any I/O during its timeslice.
-        */
-       tss->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET_LAZY;
-}
-
-/*
- *     switch_to(x,yn) should switch tasks from x to y.
- *
- * We fsave/fwait so that an exception goes off at the right time
- * (as a call from the fsave or fwait in effect) rather than to
- * the wrong process. Lazy FP saving no longer makes any sense
- * with modern CPU's, and this simplifies a lot of things (SMP
- * and UP become the same).
- *
- * NOTE! We used to use the x86 hardware context switching. The
- * reason for not using it any more becomes apparent when you
- * try to recover gracefully from saved state that is no longer
- * valid (stale segment register values in particular). With the
- * hardware task-switch, there is no way to fix up bad state in
- * a reasonable manner.
- *
- * The fact that Intel documents the hardware task-switching to
- * be slow is a fairly red herring - this code is not noticeably
- * faster. However, there _is_ some room for improvement here,
- * so the performance issues may eventually be a valid point.
- * More important, however, is the fact that this allows us much
- * more flexibility.
- *
- * The return value (in %eax) will be the "prev" task after
- * the task-switch, and shows up in ret_from_fork in entry.S,
- * for example.
- */
-struct task_struct fastcall * __switch_to(struct task_struct *prev_p, struct 
task_struct *next_p)
-{
-       struct thread_struct *prev = &prev_p->thread,
-                                *next = &next_p->thread;
-       int cpu = smp_processor_id();
-       struct tss_struct *tss = &per_cpu(init_tss, cpu);
-
-       /* never put a printk in __switch_to... printk() calls wake_up*() 
indirectly */
-
-       __unlazy_fpu(prev_p);
-
-
-       /* we're going to use this soon, after a few expensive things */
-       if (next_p->fpu_counter > 5)
-               prefetch(&next->i387.fxsave);
-
-       /*
-        * Reload esp0.
-        */
-       load_esp0(tss, next);
-
-       /*
-        * Save away %gs. No need to save %fs, as it was saved on the
-        * stack on entry.  No need to save %es and %ds, as those are
-        * always kernel segments while inside the kernel.  Doing this
-        * before setting the new TLS descriptors avoids the situation
-        * where we temporarily have non-reloadable segments in %fs
-        * and %gs.  This could be an issue if the NMI handler ever
-        * used %fs or %gs (it does not today), or if the kernel is
-        * running inside of a hypervisor layer.
-        */
-       savesegment(gs, prev->gs);
-
-       /*
-        * Load the per-thread Thread-Local Storage descriptor.
-        */
-       load_TLS(next, cpu);
-
-       /*
-        * Restore IOPL if needed.  In normal use, the flags restore
-        * in the switch assembly will handle this.  But if the kernel
-        * is running virtualized at a non-zero CPL, the popf will
-        * not restore flags, so it must be done in a separate step.
-        */
-       if (get_kernel_rpl() && unlikely(prev->iopl != next->iopl))
-               set_iopl_mask(next->iopl);
-
-       /*
-        * Now maybe handle debug registers and/or IO bitmaps
-        */
-       if (unlikely(task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV ||
-                    task_thread_info(next_p)->flags & _TIF_WORK_CTXSW_NEXT))
-               __switch_to_xtra(prev_p, next_p, tss);
-
-       /*
-        * Leave lazy mode, flushing any hypercalls made here.
-        * This must be done before restoring TLS segments so
-        * the GDT and LDT are properly updated, and must be
-        * done before math_state_restore, so the TS bit is up
-        * to date.
-        */
-       arch_leave_lazy_cpu_mode();
-
-       /* If the task has used fpu the last 5 timeslices, just do a full
-        * restore of the math state immediately to avoid the trap; the
-        * chances of needing FPU soon are obviously high now
-        */
-       if (next_p->fpu_counter > 5)
-               math_state_restore();
-
-       /*
-        * Restore %gs if needed (which is common)
-        */
-       if (prev->gs | next->gs)
-               loadsegment(gs, next->gs);
-
-       x86_write_percpu(current_task, next_p);
-
-       return prev_p;
-}
-
-asmlinkage int sys_fork(struct pt_regs regs)
-{
-       return do_fork(SIGCHLD, regs.esp, &regs, 0, NULL, NULL);
-}
-
-asmlinkage int sys_clone(struct pt_regs regs)
-{
-       unsigned long clone_flags;
-       unsigned long newsp;
-       int __user *parent_tidptr, *child_tidptr;
-
-       clone_flags = regs.ebx;
-       newsp = regs.ecx;
-       parent_tidptr = (int __user *)regs.edx;
-       child_tidptr = (int __user *)regs.edi;
-       if (!newsp)
-               newsp = regs.esp;
-       return do_fork(clone_flags, newsp, &regs, 0, parent_tidptr, 
child_tidptr);
-}
-
-/*
- * This is trivial, and on the face of it looks like it
- * could equally well be done in user mode.
- *
- * Not so, for quite unobvious reasons - register pressure.
- * In user mode vfork() cannot have a stack frame, and if
- * done by calling the "clone()" system call directly, you
- * do not have enough call-clobbered registers to hold all
- * the information you need.
- */
-asmlinkage int sys_vfork(struct pt_regs regs)
-{
-       return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.esp, &regs, 0, 
NULL, NULL);
-}
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(struct pt_regs regs)
-{
-       int error;
-       char * filename;
-
-       filename = getname((char __user *) regs.ebx);
-       error = PTR_ERR(filename);
-       if (IS_ERR(filename))
-               goto out;
-       error = do_execve(filename,
-                       (char __user * __user *) regs.ecx,
-                       (char __user * __user *) regs.edx,
-                       &regs);
-       if (error == 0) {
-               task_lock(current);
-               current->ptrace &= ~PT_DTRACE;
-               task_unlock(current);
-               /* Make sure we don't return using sysenter.. */
-               set_thread_flag(TIF_IRET);
-       }
-       putname(filename);
-out:
-       return error;
-}
-
-#define top_esp                (THREAD_SIZE - sizeof(unsigned long))
-#define top_ebp                (THREAD_SIZE - 2*sizeof(unsigned long))
-
-unsigned long get_wchan(struct task_struct *p)
-{
-       unsigned long ebp, esp, eip;
-       unsigned long stack_page;
-       int count = 0;
-       if (!p || p == current || p->state == TASK_RUNNING)
-               return 0;
-       stack_page = (unsigned long)task_stack_page(p);
-       esp = p->thread.esp;
-       if (!stack_page || esp < stack_page || esp > top_esp+stack_page)
-               return 0;
-       /* include/asm-i386/system.h:switch_to() pushes ebp last. */
-       ebp = *(unsigned long *) esp;
-       do {
-               if (ebp < stack_page || ebp > top_ebp+stack_page)
-                       return 0;
-               eip = *(unsigned long *) (ebp+4);
-               if (!in_sched_functions(eip))
-                       return eip;
-               ebp = *(unsigned long *) ebp;
-       } while (count++ < 16);
-       return 0;
-}
-
-/*
- * sys_alloc_thread_area: get a yet unused TLS descriptor index.
- */
-static int get_free_idx(void)
-{
-       struct thread_struct *t = &current->thread;
-       int idx;
-
-       for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++)
-               if (desc_empty(t->tls_array + idx))
-                       return idx + GDT_ENTRY_TLS_MIN;
-       return -ESRCH;
-}
-
-/*
- * Set a given TLS descriptor:
- */
-asmlinkage int sys_set_thread_area(struct user_desc __user *u_info)
-{
-       struct thread_struct *t = &current->thread;
-       struct user_desc info;
-       struct desc_struct *desc;
-       int cpu, idx;
-
-       if (copy_from_user(&info, u_info, sizeof(info)))
-               return -EFAULT;
-       idx = info.entry_number;
-
-       /*
-        * index -1 means the kernel should try to find and
-        * allocate an empty descriptor:
-        */
-       if (idx == -1) {
-               idx = get_free_idx();
-               if (idx < 0)
-                       return idx;
-               if (put_user(idx, &u_info->entry_number))
-                       return -EFAULT;
-       }
-
-       if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
-               return -EINVAL;
-
-       desc = t->tls_array + idx - GDT_ENTRY_TLS_MIN;
-
-       /*
-        * We must not get preempted while modifying the TLS.
-        */
-       cpu = get_cpu();
-
-       if (LDT_empty(&info)) {
-               desc->a = 0;
-               desc->b = 0;
-       } else {
-               desc->a = LDT_entry_a(&info);
-               desc->b = LDT_entry_b(&info);
-       }
-       load_TLS(t, cpu);
-
-       put_cpu();
-
-       return 0;
-}
-
-/*
- * Get the current Thread-Local Storage area:
- */
-
-#define GET_BASE(desc) ( \
-       (((desc)->a >> 16) & 0x0000ffff) | \
-       (((desc)->b << 16) & 0x00ff0000) | \
-       ( (desc)->b        & 0xff000000)   )
-
-#define GET_LIMIT(desc) ( \
-       ((desc)->a & 0x0ffff) | \
-        ((desc)->b & 0xf0000) )
-       
-#define GET_32BIT(desc)                (((desc)->b >> 22) & 1)
-#define GET_CONTENTS(desc)     (((desc)->b >> 10) & 3)
-#define GET_WRITABLE(desc)     (((desc)->b >>  9) & 1)
-#define GET_LIMIT_PAGES(desc)  (((desc)->b >> 23) & 1)
-#define GET_PRESENT(desc)      (((desc)->b >> 15) & 1)
-#define GET_USEABLE(desc)      (((desc)->b >> 20) & 1)
-
-asmlinkage int sys_get_thread_area(struct user_desc __user *u_info)
-{
-       struct user_desc info;
-       struct desc_struct *desc;
-       int idx;
-
-       if (get_user(idx, &u_info->entry_number))
-               return -EFAULT;
-       if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
-               return -EINVAL;
-
-       memset(&info, 0, sizeof(info));
-
-       desc = current->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;
-
-       info.entry_number = idx;
-       info.base_addr = GET_BASE(desc);
-       info.limit = GET_LIMIT(desc);
-       info.seg_32bit = GET_32BIT(desc);
-       info.contents = GET_CONTENTS(desc);
-       info.read_exec_only = !GET_WRITABLE(desc);
-       info.limit_in_pages = GET_LIMIT_PAGES(desc);
-       info.seg_not_present = !GET_PRESENT(desc);
-       info.useable = GET_USEABLE(desc);
-
-       if (copy_to_user(u_info, &info, sizeof(info)))
-               return -EFAULT;
-       return 0;
-}
-
-unsigned long arch_align_stack(unsigned long sp)
-{
-       if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
-               sp -= get_random_int() % 8192;
-       return sp & ~0xf;
-}
diff --git a/arch/i386/kernel/process_32.c b/arch/i386/kernel/process_32.c
new file mode 100644
index 0000000..8466471
--- /dev/null
+++ b/arch/i386/kernel/process_32.c
@@ -0,0 +1,951 @@
+/*
+ *  linux/arch/i386/kernel/process.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ *
+ *  Pentium III FXSR, SSE support
+ *     Gareth Hughes <[EMAIL PROTECTED]>, May 2000
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#include <stdarg.h>
+
+#include <linux/cpu.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/elfcore.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/interrupt.h>
+#include <linux/utsname.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/mc146818rtc.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/ptrace.h>
+#include <linux/random.h>
+#include <linux/personality.h>
+#include <linux/tick.h>
+#include <linux/percpu.h>
+
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/ldt.h>
+#include <asm/processor.h>
+#include <asm/i387.h>
+#include <asm/desc.h>
+#include <asm/vm86.h>
+#ifdef CONFIG_MATH_EMULATION
+#include <asm/math_emu.h>
+#endif
+
+#include <linux/err.h>
+
+#include <asm/tlbflush.h>
+#include <asm/cpu.h>
+
+asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
+
+static int hlt_counter;
+
+unsigned long boot_option_idle_override = 0;
+EXPORT_SYMBOL(boot_option_idle_override);
+
+DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task;
+EXPORT_PER_CPU_SYMBOL(current_task);
+
+DEFINE_PER_CPU(int, cpu_number);
+EXPORT_PER_CPU_SYMBOL(cpu_number);
+
+/*
+ * Return saved PC of a blocked thread.
+ */
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+       return ((unsigned long *)tsk->thread.esp)[3];
+}
+
+/*
+ * Powermanagement idle function, if any..
+ */
+void (*pm_idle)(void);
+EXPORT_SYMBOL(pm_idle);
+static DEFINE_PER_CPU(unsigned int, cpu_idle_state);
+
+void disable_hlt(void)
+{
+       hlt_counter++;
+}
+
+EXPORT_SYMBOL(disable_hlt);
+
+void enable_hlt(void)
+{
+       hlt_counter--;
+}
+
+EXPORT_SYMBOL(enable_hlt);
+
+/*
+ * We use this if we don't have any better
+ * idle routine..
+ */
+void default_idle(void)
+{
+       if (!hlt_counter && boot_cpu_data.hlt_works_ok) {
+               current_thread_info()->status &= ~TS_POLLING;
+               /*
+                * TS_POLLING-cleared state must be visible before we
+                * test NEED_RESCHED:
+                */
+               smp_mb();
+
+               local_irq_disable();
+               if (!need_resched())
+                       safe_halt();    /* enables interrupts racelessly */
+               else
+                       local_irq_enable();
+               current_thread_info()->status |= TS_POLLING;
+       } else {
+               /* loop is done by the caller */
+               cpu_relax();
+       }
+}
+#ifdef CONFIG_APM_MODULE
+EXPORT_SYMBOL(default_idle);
+#endif
+
+/*
+ * On SMP it's slightly faster (but much more power-consuming!)
+ * to poll the ->work.need_resched flag instead of waiting for the
+ * cross-CPU IPI to arrive. Use this option with caution.
+ */
+static void poll_idle (void)
+{
+       cpu_relax();
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+#include <asm/nmi.h>
+/* We don't actually take CPU down, just spin without interrupts. */
+static inline void play_dead(void)
+{
+       /* This must be done before dead CPU ack */
+       cpu_exit_clear();
+       wbinvd();
+       mb();
+       /* Ack it */
+       __get_cpu_var(cpu_state) = CPU_DEAD;
+
+       /*
+        * With physical CPU hotplug, we should halt the cpu
+        */
+       local_irq_disable();
+       while (1)
+               halt();
+}
+#else
+static inline void play_dead(void)
+{
+       BUG();
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+/*
+ * The idle thread. There's no useful work to be
+ * done, so just try to conserve power and have a
+ * low exit latency (ie sit in a loop waiting for
+ * somebody to say that they'd like to reschedule)
+ */
+void cpu_idle(void)
+{
+       int cpu = smp_processor_id();
+
+       current_thread_info()->status |= TS_POLLING;
+
+       /* endless idle loop with no priority at all */
+       while (1) {
+               tick_nohz_stop_sched_tick();
+               while (!need_resched()) {
+                       void (*idle)(void);
+
+                       if (__get_cpu_var(cpu_idle_state))
+                               __get_cpu_var(cpu_idle_state) = 0;
+
+                       check_pgt_cache();
+                       rmb();
+                       idle = pm_idle;
+
+                       if (!idle)
+                               idle = default_idle;
+
+                       if (cpu_is_offline(cpu))
+                               play_dead();
+
+                       __get_cpu_var(irq_stat).idle_timestamp = jiffies;
+                       idle();
+               }
+               tick_nohz_restart_sched_tick();
+               preempt_enable_no_resched();
+               schedule();
+               preempt_disable();
+       }
+}
+
+void cpu_idle_wait(void)
+{
+       unsigned int cpu, this_cpu = get_cpu();
+       cpumask_t map, tmp = current->cpus_allowed;
+
+       set_cpus_allowed(current, cpumask_of_cpu(this_cpu));
+       put_cpu();
+
+       cpus_clear(map);
+       for_each_online_cpu(cpu) {
+               per_cpu(cpu_idle_state, cpu) = 1;
+               cpu_set(cpu, map);
+       }
+
+       __get_cpu_var(cpu_idle_state) = 0;
+
+       wmb();
+       do {
+               ssleep(1);
+               for_each_online_cpu(cpu) {
+                       if (cpu_isset(cpu, map) && !per_cpu(cpu_idle_state, 
cpu))
+                               cpu_clear(cpu, map);
+               }
+               cpus_and(map, map, cpu_online_map);
+       } while (!cpus_empty(map));
+
+       set_cpus_allowed(current, tmp);
+}
+EXPORT_SYMBOL_GPL(cpu_idle_wait);
+
+/*
+ * This uses new MONITOR/MWAIT instructions on P4 processors with PNI,
+ * which can obviate IPI to trigger checking of need_resched.
+ * We execute MONITOR against need_resched and enter optimized wait state
+ * through MWAIT. Whenever someone changes need_resched, we would be woken
+ * up from MWAIT (without an IPI).
+ *
+ * New with Core Duo processors, MWAIT can take some hints based on CPU
+ * capability.
+ */
+void mwait_idle_with_hints(unsigned long eax, unsigned long ecx)
+{
+       if (!need_resched()) {
+               __monitor((void *)&current_thread_info()->flags, 0, 0);
+               smp_mb();
+               if (!need_resched())
+                       __mwait(eax, ecx);
+       }
+}
+
+/* Default MONITOR/MWAIT with no hints, used for default C1 state */
+static void mwait_idle(void)
+{
+       local_irq_enable();
+       mwait_idle_with_hints(0, 0);
+}
+
+void __devinit select_idle_routine(const struct cpuinfo_x86 *c)
+{
+       if (cpu_has(c, X86_FEATURE_MWAIT)) {
+               printk("monitor/mwait feature present.\n");
+               /*
+                * Skip, if setup has overridden idle.
+                * One CPU supports mwait => All CPUs supports mwait
+                */
+               if (!pm_idle) {
+                       printk("using mwait in idle threads.\n");
+                       pm_idle = mwait_idle;
+               }
+       }
+}
+
+static int __init idle_setup(char *str)
+{
+       if (!strcmp(str, "poll")) {
+               printk("using polling idle threads.\n");
+               pm_idle = poll_idle;
+#ifdef CONFIG_X86_SMP
+               if (smp_num_siblings > 1)
+                       printk("WARNING: polling idle and HT enabled, 
performance may degrade.\n");
+#endif
+       } else if (!strcmp(str, "mwait"))
+               force_mwait = 1;
+       else
+               return -1;
+
+       boot_option_idle_override = 1;
+       return 0;
+}
+early_param("idle", idle_setup);
+
+void show_regs(struct pt_regs * regs)
+{
+       unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;
+       unsigned long d0, d1, d2, d3, d6, d7;
+
+       printk("\n");
+       printk("Pid: %d, comm: %20s\n", current->pid, current->comm);
+       printk("EIP: %04x:[<%08lx>] CPU: %d\n",0xffff & regs->xcs,regs->eip, 
smp_processor_id());
+       print_symbol("EIP is at %s\n", regs->eip);
+
+       if (user_mode_vm(regs))
+               printk(" ESP: %04x:%08lx",0xffff & regs->xss,regs->esp);
+       printk(" EFLAGS: %08lx    %s  (%s %.*s)\n",
+              regs->eflags, print_tainted(), init_utsname()->release,
+              (int)strcspn(init_utsname()->version, " "),
+              init_utsname()->version);
+       printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
+               regs->eax,regs->ebx,regs->ecx,regs->edx);
+       printk("ESI: %08lx EDI: %08lx EBP: %08lx",
+               regs->esi, regs->edi, regs->ebp);
+       printk(" DS: %04x ES: %04x FS: %04x\n",
+              0xffff & regs->xds,0xffff & regs->xes, 0xffff & regs->xfs);
+
+       cr0 = read_cr0();
+       cr2 = read_cr2();
+       cr3 = read_cr3();
+       cr4 = read_cr4_safe();
+       printk("CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n", cr0, cr2, cr3, 
cr4);
+
+       get_debugreg(d0, 0);
+       get_debugreg(d1, 1);
+       get_debugreg(d2, 2);
+       get_debugreg(d3, 3);
+       printk("DR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
+                       d0, d1, d2, d3);
+       get_debugreg(d6, 6);
+       get_debugreg(d7, 7);
+       printk("DR6: %08lx DR7: %08lx\n", d6, d7);
+
+       show_trace(NULL, regs, &regs->esp);
+}
+
+/*
+ * This gets run with %ebx containing the
+ * function to call, and %edx containing
+ * the "args".
+ */
+extern void kernel_thread_helper(void);
+
+/*
+ * Create a kernel thread
+ */
+int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+{
+       struct pt_regs regs;
+
+       memset(&regs, 0, sizeof(regs));
+
+       regs.ebx = (unsigned long) fn;
+       regs.edx = (unsigned long) arg;
+
+       regs.xds = __USER_DS;
+       regs.xes = __USER_DS;
+       regs.xfs = __KERNEL_PERCPU;
+       regs.orig_eax = -1;
+       regs.eip = (unsigned long) kernel_thread_helper;
+       regs.xcs = __KERNEL_CS | get_kernel_rpl();
+       regs.eflags = X86_EFLAGS_IF | X86_EFLAGS_SF | X86_EFLAGS_PF | 0x2;
+
+       /* Ok, create the new process.. */
+       return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, 
NULL);
+}
+EXPORT_SYMBOL(kernel_thread);
+
+/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+       /* The process may have allocated an io port bitmap... nuke it. */
+       if (unlikely(test_thread_flag(TIF_IO_BITMAP))) {
+               struct task_struct *tsk = current;
+               struct thread_struct *t = &tsk->thread;
+               int cpu = get_cpu();
+               struct tss_struct *tss = &per_cpu(init_tss, cpu);
+
+               kfree(t->io_bitmap_ptr);
+               t->io_bitmap_ptr = NULL;
+               clear_thread_flag(TIF_IO_BITMAP);
+               /*
+                * Careful, clear this in the TSS too:
+                */
+               memset(tss->io_bitmap, 0xff, tss->io_bitmap_max);
+               t->io_bitmap_max = 0;
+               tss->io_bitmap_owner = NULL;
+               tss->io_bitmap_max = 0;
+               tss->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET;
+               put_cpu();
+       }
+}
+
+void flush_thread(void)
+{
+       struct task_struct *tsk = current;
+
+       memset(tsk->thread.debugreg, 0, sizeof(unsigned long)*8);
+       memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));        
+       clear_tsk_thread_flag(tsk, TIF_DEBUG);
+       /*
+        * Forget coprocessor state..
+        */
+       clear_fpu(tsk);
+       clear_used_math();
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+       BUG_ON(dead_task->mm);
+       release_vm86_irqs(dead_task);
+}
+
+/*
+ * This gets called before we allocate a new thread and copy
+ * the current task into it.
+ */
+void prepare_to_copy(struct task_struct *tsk)
+{
+       unlazy_fpu(tsk);
+}
+
+int copy_thread(int nr, unsigned long clone_flags, unsigned long esp,
+       unsigned long unused,
+       struct task_struct * p, struct pt_regs * regs)
+{
+       struct pt_regs * childregs;
+       struct task_struct *tsk;
+       int err;
+
+       childregs = task_pt_regs(p);
+       *childregs = *regs;
+       childregs->eax = 0;
+       childregs->esp = esp;
+
+       p->thread.esp = (unsigned long) childregs;
+       p->thread.esp0 = (unsigned long) (childregs+1);
+
+       p->thread.eip = (unsigned long) ret_from_fork;
+
+       savesegment(gs,p->thread.gs);
+
+       tsk = current;
+       if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) {
+               p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr,
+                                               IO_BITMAP_BYTES, GFP_KERNEL);
+               if (!p->thread.io_bitmap_ptr) {
+                       p->thread.io_bitmap_max = 0;
+                       return -ENOMEM;
+               }
+               set_tsk_thread_flag(p, TIF_IO_BITMAP);
+       }
+
+       /*
+        * Set a new TLS for the child thread?
+        */
+       if (clone_flags & CLONE_SETTLS) {
+               struct desc_struct *desc;
+               struct user_desc info;
+               int idx;
+
+               err = -EFAULT;
+               if (copy_from_user(&info, (void __user *)childregs->esi, 
sizeof(info)))
+                       goto out;
+               err = -EINVAL;
+               if (LDT_empty(&info))
+                       goto out;
+
+               idx = info.entry_number;
+               if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
+                       goto out;
+
+               desc = p->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;
+               desc->a = LDT_entry_a(&info);
+               desc->b = LDT_entry_b(&info);
+       }
+
+       err = 0;
+ out:
+       if (err && p->thread.io_bitmap_ptr) {
+               kfree(p->thread.io_bitmap_ptr);
+               p->thread.io_bitmap_max = 0;
+       }
+       return err;
+}
+
+/*
+ * fill in the user structure for a core dump..
+ */
+void dump_thread(struct pt_regs * regs, struct user * dump)
+{
+       int i;
+
+/* changed the size calculations - should hopefully work better. lbt */
+       dump->magic = CMAGIC;
+       dump->start_code = 0;
+       dump->start_stack = regs->esp & ~(PAGE_SIZE - 1);
+       dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
+       dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))) >> 
PAGE_SHIFT;
+       dump->u_dsize -= dump->u_tsize;
+       dump->u_ssize = 0;
+       for (i = 0; i < 8; i++)
+               dump->u_debugreg[i] = current->thread.debugreg[i];  
+
+       if (dump->start_stack < TASK_SIZE)
+               dump->u_ssize = ((unsigned long) (TASK_SIZE - 
dump->start_stack)) >> PAGE_SHIFT;
+
+       dump->regs.ebx = regs->ebx;
+       dump->regs.ecx = regs->ecx;
+       dump->regs.edx = regs->edx;
+       dump->regs.esi = regs->esi;
+       dump->regs.edi = regs->edi;
+       dump->regs.ebp = regs->ebp;
+       dump->regs.eax = regs->eax;
+       dump->regs.ds = regs->xds;
+       dump->regs.es = regs->xes;
+       dump->regs.fs = regs->xfs;
+       savesegment(gs,dump->regs.gs);
+       dump->regs.orig_eax = regs->orig_eax;
+       dump->regs.eip = regs->eip;
+       dump->regs.cs = regs->xcs;
+       dump->regs.eflags = regs->eflags;
+       dump->regs.esp = regs->esp;
+       dump->regs.ss = regs->xss;
+
+       dump->u_fpvalid = dump_fpu (regs, &dump->i387);
+}
+EXPORT_SYMBOL(dump_thread);
+
+/* 
+ * Capture the user space registers if the task is not running (in user space)
+ */
+int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
+{
+       struct pt_regs ptregs = *task_pt_regs(tsk);
+       ptregs.xcs &= 0xffff;
+       ptregs.xds &= 0xffff;
+       ptregs.xes &= 0xffff;
+       ptregs.xss &= 0xffff;
+
+       elf_core_copy_regs(regs, &ptregs);
+
+       return 1;
+}
+
+#ifdef CONFIG_SECCOMP
+void hard_disable_TSC(void)
+{
+       write_cr4(read_cr4() | X86_CR4_TSD);
+}
+void disable_TSC(void)
+{
+       preempt_disable();
+       if (!test_and_set_thread_flag(TIF_NOTSC))
+               /*
+                * Must flip the CPU state synchronously with
+                * TIF_NOTSC in the current running context.
+                */
+               hard_disable_TSC();
+       preempt_enable();
+}
+void hard_enable_TSC(void)
+{
+       write_cr4(read_cr4() & ~X86_CR4_TSD);
+}
+#endif /* CONFIG_SECCOMP */
+
+static noinline void
+__switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
+                struct tss_struct *tss)
+{
+       struct thread_struct *next;
+
+       next = &next_p->thread;
+
+       if (test_tsk_thread_flag(next_p, TIF_DEBUG)) {
+               set_debugreg(next->debugreg[0], 0);
+               set_debugreg(next->debugreg[1], 1);
+               set_debugreg(next->debugreg[2], 2);
+               set_debugreg(next->debugreg[3], 3);
+               /* no 4 and 5 */
+               set_debugreg(next->debugreg[6], 6);
+               set_debugreg(next->debugreg[7], 7);
+       }
+
+#ifdef CONFIG_SECCOMP
+       if (test_tsk_thread_flag(prev_p, TIF_NOTSC) ^
+           test_tsk_thread_flag(next_p, TIF_NOTSC)) {
+               /* prev and next are different */
+               if (test_tsk_thread_flag(next_p, TIF_NOTSC))
+                       hard_disable_TSC();
+               else
+                       hard_enable_TSC();
+       }
+#endif
+
+       if (!test_tsk_thread_flag(next_p, TIF_IO_BITMAP)) {
+               /*
+                * Disable the bitmap via an invalid offset. We still cache
+                * the previous bitmap owner and the IO bitmap contents:
+                */
+               tss->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET;
+               return;
+       }
+
+       if (likely(next == tss->io_bitmap_owner)) {
+               /*
+                * Previous owner of the bitmap (hence the bitmap content)
+                * matches the next task, we dont have to do anything but
+                * to set a valid offset in the TSS:
+                */
+               tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET;
+               return;
+       }
+       /*
+        * Lazy TSS's I/O bitmap copy. We set an invalid offset here
+        * and we let the task to get a GPF in case an I/O instruction
+        * is performed.  The handler of the GPF will verify that the
+        * faulting task has a valid I/O bitmap and, it true, does the
+        * real copy and restart the instruction.  This will save us
+        * redundant copies when the currently switched task does not
+        * perform any I/O during its timeslice.
+        */
+       tss->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET_LAZY;
+}
+
+/*
+ *     switch_to(x,yn) should switch tasks from x to y.
+ *
+ * We fsave/fwait so that an exception goes off at the right time
+ * (as a call from the fsave or fwait in effect) rather than to
+ * the wrong process. Lazy FP saving no longer makes any sense
+ * with modern CPU's, and this simplifies a lot of things (SMP
+ * and UP become the same).
+ *
+ * NOTE! We used to use the x86 hardware context switching. The
+ * reason for not using it any more becomes apparent when you
+ * try to recover gracefully from saved state that is no longer
+ * valid (stale segment register values in particular). With the
+ * hardware task-switch, there is no way to fix up bad state in
+ * a reasonable manner.
+ *
+ * The fact that Intel documents the hardware task-switching to
+ * be slow is a fairly red herring - this code is not noticeably
+ * faster. However, there _is_ some room for improvement here,
+ * so the performance issues may eventually be a valid point.
+ * More important, however, is the fact that this allows us much
+ * more flexibility.
+ *
+ * The return value (in %eax) will be the "prev" task after
+ * the task-switch, and shows up in ret_from_fork in entry.S,
+ * for example.
+ */
+struct task_struct fastcall * __switch_to(struct task_struct *prev_p, struct 
task_struct *next_p)
+{
+       struct thread_struct *prev = &prev_p->thread,
+                                *next = &next_p->thread;
+       int cpu = smp_processor_id();
+       struct tss_struct *tss = &per_cpu(init_tss, cpu);
+
+       /* never put a printk in __switch_to... printk() calls wake_up*() 
indirectly */
+
+       __unlazy_fpu(prev_p);
+
+
+       /* we're going to use this soon, after a few expensive things */
+       if (next_p->fpu_counter > 5)
+               prefetch(&next->i387.fxsave);
+
+       /*
+        * Reload esp0.
+        */
+       load_esp0(tss, next);
+
+       /*
+        * Save away %gs. No need to save %fs, as it was saved on the
+        * stack on entry.  No need to save %es and %ds, as those are
+        * always kernel segments while inside the kernel.  Doing this
+        * before setting the new TLS descriptors avoids the situation
+        * where we temporarily have non-reloadable segments in %fs
+        * and %gs.  This could be an issue if the NMI handler ever
+        * used %fs or %gs (it does not today), or if the kernel is
+        * running inside of a hypervisor layer.
+        */
+       savesegment(gs, prev->gs);
+
+       /*
+        * Load the per-thread Thread-Local Storage descriptor.
+        */
+       load_TLS(next, cpu);
+
+       /*
+        * Restore IOPL if needed.  In normal use, the flags restore
+        * in the switch assembly will handle this.  But if the kernel
+        * is running virtualized at a non-zero CPL, the popf will
+        * not restore flags, so it must be done in a separate step.
+        */
+       if (get_kernel_rpl() && unlikely(prev->iopl != next->iopl))
+               set_iopl_mask(next->iopl);
+
+       /*
+        * Now maybe handle debug registers and/or IO bitmaps
+        */
+       if (unlikely(task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV ||
+                    task_thread_info(next_p)->flags & _TIF_WORK_CTXSW_NEXT))
+               __switch_to_xtra(prev_p, next_p, tss);
+
+       /*
+        * Leave lazy mode, flushing any hypercalls made here.
+        * This must be done before restoring TLS segments so
+        * the GDT and LDT are properly updated, and must be
+        * done before math_state_restore, so the TS bit is up
+        * to date.
+        */
+       arch_leave_lazy_cpu_mode();
+
+       /* If the task has used fpu the last 5 timeslices, just do a full
+        * restore of the math state immediately to avoid the trap; the
+        * chances of needing FPU soon are obviously high now
+        */
+       if (next_p->fpu_counter > 5)
+               math_state_restore();
+
+       /*
+        * Restore %gs if needed (which is common)
+        */
+       if (prev->gs | next->gs)
+               loadsegment(gs, next->gs);
+
+       x86_write_percpu(current_task, next_p);
+
+       return prev_p;
+}
+
+asmlinkage int sys_fork(struct pt_regs regs)
+{
+       return do_fork(SIGCHLD, regs.esp, &regs, 0, NULL, NULL);
+}
+
+asmlinkage int sys_clone(struct pt_regs regs)
+{
+       unsigned long clone_flags;
+       unsigned long newsp;
+       int __user *parent_tidptr, *child_tidptr;
+
+       clone_flags = regs.ebx;
+       newsp = regs.ecx;
+       parent_tidptr = (int __user *)regs.edx;
+       child_tidptr = (int __user *)regs.edi;
+       if (!newsp)
+               newsp = regs.esp;
+       return do_fork(clone_flags, newsp, &regs, 0, parent_tidptr, 
child_tidptr);
+}
+
+/*
+ * This is trivial, and on the face of it looks like it
+ * could equally well be done in user mode.
+ *
+ * Not so, for quite unobvious reasons - register pressure.
+ * In user mode vfork() cannot have a stack frame, and if
+ * done by calling the "clone()" system call directly, you
+ * do not have enough call-clobbered registers to hold all
+ * the information you need.
+ */
+asmlinkage int sys_vfork(struct pt_regs regs)
+{
+       return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.esp, &regs, 0, 
NULL, NULL);
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+asmlinkage int sys_execve(struct pt_regs regs)
+{
+       int error;
+       char * filename;
+
+       filename = getname((char __user *) regs.ebx);
+       error = PTR_ERR(filename);
+       if (IS_ERR(filename))
+               goto out;
+       error = do_execve(filename,
+                       (char __user * __user *) regs.ecx,
+                       (char __user * __user *) regs.edx,
+                       &regs);
+       if (error == 0) {
+               task_lock(current);
+               current->ptrace &= ~PT_DTRACE;
+               task_unlock(current);
+               /* Make sure we don't return using sysenter.. */
+               set_thread_flag(TIF_IRET);
+       }
+       putname(filename);
+out:
+       return error;
+}
+
+#define top_esp                (THREAD_SIZE - sizeof(unsigned long))
+#define top_ebp                (THREAD_SIZE - 2*sizeof(unsigned long))
+
+unsigned long get_wchan(struct task_struct *p)
+{
+       unsigned long ebp, esp, eip;
+       unsigned long stack_page;
+       int count = 0;
+       if (!p || p == current || p->state == TASK_RUNNING)
+               return 0;
+       stack_page = (unsigned long)task_stack_page(p);
+       esp = p->thread.esp;
+       if (!stack_page || esp < stack_page || esp > top_esp+stack_page)
+               return 0;
+       /* include/asm-i386/system.h:switch_to() pushes ebp last. */
+       ebp = *(unsigned long *) esp;
+       do {
+               if (ebp < stack_page || ebp > top_ebp+stack_page)
+                       return 0;
+               eip = *(unsigned long *) (ebp+4);
+               if (!in_sched_functions(eip))
+                       return eip;
+               ebp = *(unsigned long *) ebp;
+       } while (count++ < 16);
+       return 0;
+}
+
+/*
+ * sys_alloc_thread_area: get a yet unused TLS descriptor index.
+ */
+static int get_free_idx(void)
+{
+       struct thread_struct *t = &current->thread;
+       int idx;
+
+       for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++)
+               if (desc_empty(t->tls_array + idx))
+                       return idx + GDT_ENTRY_TLS_MIN;
+       return -ESRCH;
+}
+
+/*
+ * Set a given TLS descriptor:
+ */
+asmlinkage int sys_set_thread_area(struct user_desc __user *u_info)
+{
+       struct thread_struct *t = &current->thread;
+       struct user_desc info;
+       struct desc_struct *desc;
+       int cpu, idx;
+
+       if (copy_from_user(&info, u_info, sizeof(info)))
+               return -EFAULT;
+       idx = info.entry_number;
+
+       /*
+        * index -1 means the kernel should try to find and
+        * allocate an empty descriptor:
+        */
+       if (idx == -1) {
+               idx = get_free_idx();
+               if (idx < 0)
+                       return idx;
+               if (put_user(idx, &u_info->entry_number))
+                       return -EFAULT;
+       }
+
+       if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
+               return -EINVAL;
+
+       desc = t->tls_array + idx - GDT_ENTRY_TLS_MIN;
+
+       /*
+        * We must not get preempted while modifying the TLS.
+        */
+       cpu = get_cpu();
+
+       if (LDT_empty(&info)) {
+               desc->a = 0;
+               desc->b = 0;
+       } else {
+               desc->a = LDT_entry_a(&info);
+               desc->b = LDT_entry_b(&info);
+       }
+       load_TLS(t, cpu);
+
+       put_cpu();
+
+       return 0;
+}
+
+/*
+ * Get the current Thread-Local Storage area:
+ */
+
+#define GET_BASE(desc) ( \
+       (((desc)->a >> 16) & 0x0000ffff) | \
+       (((desc)->b << 16) & 0x00ff0000) | \
+       ( (desc)->b        & 0xff000000)   )
+
+#define GET_LIMIT(desc) ( \
+       ((desc)->a & 0x0ffff) | \
+        ((desc)->b & 0xf0000) )
+       
+#define GET_32BIT(desc)                (((desc)->b >> 22) & 1)
+#define GET_CONTENTS(desc)     (((desc)->b >> 10) & 3)
+#define GET_WRITABLE(desc)     (((desc)->b >>  9) & 1)
+#define GET_LIMIT_PAGES(desc)  (((desc)->b >> 23) & 1)
+#define GET_PRESENT(desc)      (((desc)->b >> 15) & 1)
+#define GET_USEABLE(desc)      (((desc)->b >> 20) & 1)
+
+asmlinkage int sys_get_thread_area(struct user_desc __user *u_info)
+{
+       struct user_desc info;
+       struct desc_struct *desc;
+       int idx;
+
+       if (get_user(idx, &u_info->entry_number))
+               return -EFAULT;
+       if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
+               return -EINVAL;
+
+       memset(&info, 0, sizeof(info));
+
+       desc = current->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;
+
+       info.entry_number = idx;
+       info.base_addr = GET_BASE(desc);
+       info.limit = GET_LIMIT(desc);
+       info.seg_32bit = GET_32BIT(desc);
+       info.contents = GET_CONTENTS(desc);
+       info.read_exec_only = !GET_WRITABLE(desc);
+       info.limit_in_pages = GET_LIMIT_PAGES(desc);
+       info.seg_not_present = !GET_PRESENT(desc);
+       info.useable = GET_USEABLE(desc);
+
+       if (copy_to_user(u_info, &info, sizeof(info)))
+               return -EFAULT;
+       return 0;
+}
+
+unsigned long arch_align_stack(unsigned long sp)
+{
+       if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+               sp -= get_random_int() % 8192;
+       return sp & ~0xf;
+}
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