Merge commit 'v2.6.28-rc8' into x86/irq

14 files changed, 137 insertions, 103 deletions

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 943fe6026c64..3de1f2350457 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -42,7 +42,7 @@ obj-$(CONFIG_X86_TRAMPOLINE)	+= trampoline.o
 obj-y                           += process.o
 obj-y                           += i387.o xsave.o
 obj-y                           += ptrace.o
-obj-y                           += ds.o
+obj-$(CONFIG_X86_DS)            += ds.o
 obj-$(CONFIG_X86_32)            += tls.o
 obj-$(CONFIG_IA32_EMULATION)    += tls.o
 obj-y                           += step.o
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index e4899e0e8787..a7b6dec6fc3f 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -187,6 +187,8 @@ static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
 
         spin_lock_irqsave(&iommu->lock, flags);
         ret = __iommu_queue_command(iommu, cmd);
+        if (!ret)
+                iommu->need_sync = 1;
         spin_unlock_irqrestore(&iommu->lock, flags);
 
         return ret;
@@ -210,10 +212,13 @@ static int iommu_completion_wait(struct amd_iommu *iommu)
         cmd.data[0] = CMD_COMPL_WAIT_INT_MASK;
         CMD_SET_TYPE(&cmd, CMD_COMPL_WAIT);
 
-        iommu->need_sync = 0;
-
         spin_lock_irqsave(&iommu->lock, flags);
 
+        if (!iommu->need_sync)
+                goto out;
+
+        iommu->need_sync = 0;
+
         ret = __iommu_queue_command(iommu, &cmd);
 
         if (ret)
@@ -254,8 +259,6 @@ static int iommu_queue_inv_dev_entry(struct amd_iommu *iommu, u16 devid)
 
         ret = iommu_queue_command(iommu, &cmd);
 
-        iommu->need_sync = 1;
-
         return ret;
 }
 
@@ -281,8 +284,6 @@ static int iommu_queue_inv_iommu_pages(struct amd_iommu *iommu,
 
         ret = iommu_queue_command(iommu, &cmd);
 
-        iommu->need_sync = 1;
-
         return ret;
 }
 
@@ -343,7 +344,7 @@ static int iommu_map(struct protection_domain *dom,
         u64 __pte, *pte, *page;
 
         bus_addr  = PAGE_ALIGN(bus_addr);
-        phys_addr = PAGE_ALIGN(bus_addr);
+        phys_addr = PAGE_ALIGN(phys_addr);
 
         /* only support 512GB address spaces for now */
         if (bus_addr > IOMMU_MAP_SIZE_L3 || !(prot & IOMMU_PROT_MASK))
@@ -599,7 +600,7 @@ static void dma_ops_free_pagetable(struct dma_ops_domain *dma_dom)
                         continue;
 
                 p2 = IOMMU_PTE_PAGE(p1[i]);
-                for (j = 0; j < 512; ++i) {
+                for (j = 0; j < 512; ++j) {
                         if (!IOMMU_PTE_PRESENT(p2[j]))
                                 continue;
                         p3 = IOMMU_PTE_PAGE(p2[j]);
@@ -762,8 +763,6 @@ static void set_device_domain(struct amd_iommu *iommu,
         write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
 
         iommu_queue_inv_dev_entry(iommu, devid);
-
-        iommu->need_sync = 1;
 }
 
 /*****************************************************************************
@@ -858,6 +857,9 @@ static int get_device_resources(struct device *dev,
                 print_devid(_bdf, 1);
         }
 
+        if (domain_for_device(_bdf) == NULL)
+                set_device_domain(*iommu, *domain, _bdf);
+
         return 1;
 }
 
@@ -908,7 +910,7 @@ static void dma_ops_domain_unmap(struct amd_iommu *iommu,
         if (address >= dom->aperture_size)
                 return;
 
-        WARN_ON(address & 0xfffULL || address > dom->aperture_size);
+        WARN_ON(address & ~PAGE_MASK || address >= dom->aperture_size);
 
         pte  = dom->pte_pages[IOMMU_PTE_L1_INDEX(address)];
         pte += IOMMU_PTE_L0_INDEX(address);
@@ -920,8 +922,8 @@ static void dma_ops_domain_unmap(struct amd_iommu *iommu,
 
 /*
  * This function contains common code for mapping of a physically
- * contiguous memory region into DMA address space. It is uses by all
- * mapping functions provided by this IOMMU driver.
+ * contiguous memory region into DMA address space. It is used by all
+ * mapping functions provided with this IOMMU driver.
  * Must be called with the domain lock held.
  */
 static dma_addr_t __map_single(struct device *dev,
@@ -981,7 +983,8 @@ static void __unmap_single(struct amd_iommu *iommu,
         dma_addr_t i, start;
         unsigned int pages;
 
-        if ((dma_addr == 0) || (dma_addr + size > dma_dom->aperture_size))
+        if ((dma_addr == bad_dma_address) ||
+            (dma_addr + size > dma_dom->aperture_size))
                 return;
 
         pages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
@@ -1031,8 +1034,7 @@ static dma_addr_t map_single(struct device *dev, phys_addr_t paddr,
         if (addr == bad_dma_address)
                 goto out;
 
-        if (unlikely(iommu->need_sync))
-                iommu_completion_wait(iommu);
+        iommu_completion_wait(iommu);
 
 out:
         spin_unlock_irqrestore(&domain->lock, flags);
@@ -1060,8 +1062,7 @@ static void unmap_single(struct device *dev, dma_addr_t dma_addr,
 
         __unmap_single(iommu, domain->priv, dma_addr, size, dir);
 
-        if (unlikely(iommu->need_sync))
-                iommu_completion_wait(iommu);
+        iommu_completion_wait(iommu);
 
         spin_unlock_irqrestore(&domain->lock, flags);
 }
@@ -1127,8 +1128,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
                         goto unmap;
         }
 
-        if (unlikely(iommu->need_sync))
-                iommu_completion_wait(iommu);
+        iommu_completion_wait(iommu);
 
 out:
         spin_unlock_irqrestore(&domain->lock, flags);
@@ -1173,8 +1173,7 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist,
                 s->dma_address = s->dma_length = 0;
         }
 
-        if (unlikely(iommu->need_sync))
-                iommu_completion_wait(iommu);
+        iommu_completion_wait(iommu);
 
         spin_unlock_irqrestore(&domain->lock, flags);
 }
@@ -1225,8 +1224,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
                 goto out;
         }
 
-        if (unlikely(iommu->need_sync))
-                iommu_completion_wait(iommu);
+        iommu_completion_wait(iommu);
 
 out:
         spin_unlock_irqrestore(&domain->lock, flags);
@@ -1257,8 +1255,7 @@ static void free_coherent(struct device *dev, size_t size,
 
         __unmap_single(iommu, domain->priv, dma_addr, size, DMA_BIDIRECTIONAL);
 
-        if (unlikely(iommu->need_sync))
-                iommu_completion_wait(iommu);
+        iommu_completion_wait(iommu);
 
         spin_unlock_irqrestore(&domain->lock, flags);
 
diff --git a/arch/x86/kernel/apic.c b/arch/x86/kernel/apic.c
index 04a7f960bbc0..16f94879b525 100644
--- a/arch/x86/kernel/apic.c
+++ b/arch/x86/kernel/apic.c
@@ -1315,7 +1315,7 @@ void enable_x2apic(void)
         }
 }
 
-void enable_IR_x2apic(void)
+void __init enable_IR_x2apic(void)
 {
 #ifdef CONFIG_INTR_REMAP
         int ret;
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index d3dcd58b87cd..7f05f44b97e9 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -115,9 +115,20 @@ static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
         u32 i = 0;
 
         if (cpu_family == CPU_HW_PSTATE) {
-                rdmsr(MSR_PSTATE_STATUS, lo, hi);
-                i = lo & HW_PSTATE_MASK;
-                data->currpstate = i;
+                if (data->currpstate == HW_PSTATE_INVALID) {
+                        /* read (initial) hw pstate if not yet set */
+                        rdmsr(MSR_PSTATE_STATUS, lo, hi);
+                        i = lo & HW_PSTATE_MASK;
+
+                        /*
+                         * a workaround for family 11h erratum 311 might cause
+                         * an "out-of-range Pstate if the core is in Pstate-0
+                         */
+                        if (i >= data->numps)
+                                data->currpstate = HW_PSTATE_0;
+                        else
+                                data->currpstate = i;
+                }
                 return 0;
         }
         do {
@@ -1121,6 +1132,7 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
         }
 
         data->cpu = pol->cpu;
+        data->currpstate = HW_PSTATE_INVALID;
 
         if (powernow_k8_cpu_init_acpi(data)) {
                 /*
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.h b/arch/x86/kernel/cpu/cpufreq/powernow-k8.h
index ab48cfed4d96..65cfb5d7f77f 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.h
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.h
@@ -5,6 +5,19 @@
  *  http://www.gnu.org/licenses/gpl.html
  */
 
+
+enum pstate {
+        HW_PSTATE_INVALID = 0xff,
+        HW_PSTATE_0 = 0,
+        HW_PSTATE_1 = 1,
+        HW_PSTATE_2 = 2,
+        HW_PSTATE_3 = 3,
+        HW_PSTATE_4 = 4,
+        HW_PSTATE_5 = 5,
+        HW_PSTATE_6 = 6,
+        HW_PSTATE_7 = 7,
+};
+
 struct powernow_k8_data {
         unsigned int cpu;
 
@@ -23,7 +36,9 @@ struct powernow_k8_data {
         u32 exttype; /* extended interface = 1 */
 
         /* keep track of the current fid / vid or pstate */
-        u32 currvid, currfid, currpstate;
+        u32 currvid;
+        u32 currfid;
+        enum pstate currpstate;
 
         /* the powernow_table includes all frequency and vid/fid pairings:
          * fid are the lower 8 bits of the index, vid are the upper 8 bits.
diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index d1a121443bde..a2d1176c38ee 100644
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -21,8 +21,6 @@
  */
 
 
-#ifdef CONFIG_X86_DS
-
 #include <asm/ds.h>
 
 #include <linux/errno.h>
@@ -211,14 +209,15 @@ static DEFINE_PER_CPU(struct ds_context *, system_context);
 static inline struct ds_context *ds_get_context(struct task_struct *task)
 {
         struct ds_context *context;
+        unsigned long irq;
 
-        spin_lock(&ds_lock);
+        spin_lock_irqsave(&ds_lock, irq);
 
         context = (task ? task->thread.ds_ctx : this_system_context);
         if (context)
                 context->count++;
 
-        spin_unlock(&ds_lock);
+        spin_unlock_irqrestore(&ds_lock, irq);
 
         return context;
 }
@@ -226,55 +225,46 @@ static inline struct ds_context *ds_get_context(struct task_struct *task)
 /*
  * Same as ds_get_context, but allocates the context and it's DS
  * structure, if necessary; returns NULL; if out of memory.
- *
- * pre: requires ds_lock to be held
  */
 static inline struct ds_context *ds_alloc_context(struct task_struct *task)
 {
         struct ds_context **p_context =
                 (task ? &task->thread.ds_ctx : &this_system_context);
         struct ds_context *context = *p_context;
+        unsigned long irq;
 
         if (!context) {
-                spin_unlock(&ds_lock);
-
                 context = kzalloc(sizeof(*context), GFP_KERNEL);
-
-                if (!context) {
-                        spin_lock(&ds_lock);
+                if (!context)
                         return NULL;
-                }
 
                 context->ds = kzalloc(ds_cfg.sizeof_ds, GFP_KERNEL);
                 if (!context->ds) {
                         kfree(context);
-                        spin_lock(&ds_lock);
                         return NULL;
                 }
 
-                spin_lock(&ds_lock);
-                /*
-                 * Check for race - another CPU could have allocated
-                 * it meanwhile:
-                 */
+                spin_lock_irqsave(&ds_lock, irq);
+
                 if (*p_context) {
                         kfree(context->ds);
                         kfree(context);
-                        return *p_context;
-                }
 
-                *p_context = context;
+                        context = *p_context;
+                } else {
+                        *p_context = context;
 
-                context->this = p_context;
-                context->task = task;
+                        context->this = p_context;
+                        context->task = task;
 
-                if (task)
-                        set_tsk_thread_flag(task, TIF_DS_AREA_MSR);
+                        if (task)
+                                set_tsk_thread_flag(task, TIF_DS_AREA_MSR);
 
-                if (!task || (task == current))
-                        wrmsr(MSR_IA32_DS_AREA, (unsigned long)context->ds, 0);
-
-                get_tracer(task);
+                        if (!task || (task == current))
+                                wrmsrl(MSR_IA32_DS_AREA,
+                                       (unsigned long)context->ds);
+                }
+                spin_unlock_irqrestore(&ds_lock, irq);
         }
 
         context->count++;
@@ -288,10 +278,12 @@ static inline struct ds_context *ds_alloc_context(struct task_struct *task)
  */
 static inline void ds_put_context(struct ds_context *context)
 {
+        unsigned long irq;
+
         if (!context)
                 return;
 
-        spin_lock(&ds_lock);
+        spin_lock_irqsave(&ds_lock, irq);
 
         if (--context->count)
                 goto out;
@@ -313,7 +305,7 @@ static inline void ds_put_context(struct ds_context *context)
         kfree(context->ds);
         kfree(context);
  out:
-        spin_unlock(&ds_lock);
+        spin_unlock_irqrestore(&ds_lock, irq);
 }
 
 
@@ -384,6 +376,7 @@ static int ds_request(struct task_struct *task, void *base, size_t size,
         struct ds_context *context;
         unsigned long buffer, adj;
         const unsigned long alignment = (1 << 3);
+        unsigned long irq;
         int error = 0;
 
         if (!ds_cfg.sizeof_ds)
@@ -398,26 +391,27 @@ static int ds_request(struct task_struct *task, void *base, size_t size,
                 return -EOPNOTSUPP;
 
 
-        spin_lock(&ds_lock);
-
-        error = -ENOMEM;
         context = ds_alloc_context(task);
         if (!context)
-                goto out_unlock;
+                return -ENOMEM;
+
+        spin_lock_irqsave(&ds_lock, irq);
 
         error = -EPERM;
         if (!check_tracer(task))
                 goto out_unlock;
 
+        get_tracer(task);
+
         error = -EALREADY;
         if (context->owner[qual] == current)
-                goto out_unlock;
+                goto out_put_tracer;
         error = -EPERM;
         if (context->owner[qual] != NULL)
-                goto out_unlock;
+                goto out_put_tracer;
         context->owner[qual] = current;
 
-        spin_unlock(&ds_lock);
+        spin_unlock_irqrestore(&ds_lock, irq);
 
 
         error = -ENOMEM;
@@ -465,10 +459,17 @@ static int ds_request(struct task_struct *task, void *base, size_t size,
  out_release:
         context->owner[qual] = NULL;
         ds_put_context(context);
+        put_tracer(task);
+        return error;
+
+ out_put_tracer:
+        spin_unlock_irqrestore(&ds_lock, irq);
+        ds_put_context(context);
+        put_tracer(task);
         return error;
 
  out_unlock:
-        spin_unlock(&ds_lock);
+        spin_unlock_irqrestore(&ds_lock, irq);
         ds_put_context(context);
         return error;
 }
@@ -818,13 +819,21 @@ static const struct ds_configuration ds_cfg_var = {
         .sizeof_ds    = sizeof(long) * 12,
         .sizeof_field = sizeof(long),
         .sizeof_rec[ds_bts]   = sizeof(long) * 3,
+#ifdef __i386__
         .sizeof_rec[ds_pebs]  = sizeof(long) * 10
+#else
+        .sizeof_rec[ds_pebs]  = sizeof(long) * 18
+#endif
 };
 static const struct ds_configuration ds_cfg_64 = {
         .sizeof_ds    = 8 * 12,
         .sizeof_field = 8,
         .sizeof_rec[ds_bts]   = 8 * 3,
+#ifdef __i386__
         .sizeof_rec[ds_pebs]  = 8 * 10
+#else
+        .sizeof_rec[ds_pebs]  = 8 * 18
+#endif
 };
 
 static inline void
@@ -878,4 +887,3 @@ void ds_free(struct ds_context *context)
         while (leftovers--)
                 ds_put_context(context);
 }
-#endif /* CONFIG_X86_DS */
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index 1f20608d4ca8..b0f61f0dcd0a 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -58,7 +58,7 @@ void __cpuinit mxcsr_feature_mask_init(void)
         stts();
 }
 
-void __init init_thread_xstate(void)
+void __cpuinit init_thread_xstate(void)
 {
         if (!HAVE_HWFP) {
                 xstate_size = sizeof(struct i387_soft_struct);
diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index c9513e1ff28d..9043251210fb 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -3608,27 +3608,7 @@ int __init io_apic_get_redir_entries (int ioapic)
 
 int __init probe_nr_irqs(void)
 {
-        int idx;
-        int nr = 0;
-#ifndef CONFIG_XEN
-        int nr_min = 32;
-#else
-        int nr_min = NR_IRQS;
-#endif
-
-        for (idx = 0; idx < nr_ioapics; idx++)
-                nr += io_apic_get_redir_entries(idx) + 1;
-
-        /* double it for hotplug and msi and nmi */
-        nr <<= 1;
-
-        /* something wrong ? */
-        if (nr < nr_min)
-                nr = nr_min;
-        if (WARN_ON(nr > NR_IRQS))
-                nr = NR_IRQS;
-
-        return nr;
+        return NR_IRQS;
 }
 
 /* --------------------------------------------------------------------------
@@ -3775,7 +3755,9 @@ int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
 void __init setup_ioapic_dest(void)
 {
         int pin, ioapic, irq, irq_entry;
+        struct irq_desc *desc;
         struct irq_cfg *cfg;
+        cpumask_t mask;
 
         if (skip_ioapic_setup == 1)
                 return;
@@ -3792,16 +3774,30 @@ void __init setup_ioapic_dest(void)
                          * cpu is online.
                          */
                         cfg = irq_cfg(irq);
-                        if (!cfg->vector)
+                        if (!cfg->vector) {
                                 setup_IO_APIC_irq(ioapic, pin, irq,
                                                   irq_trigger(irq_entry),
                                                   irq_polarity(irq_entry));
+                                continue;
+
+                        }
+
+                        /*
+                         * Honour affinities which have been set in early boot
+                         */
+                        desc = irq_to_desc(irq);
+                        if (desc->status &
+                            (IRQ_NO_BALANCING | IRQ_AFFINITY_SET))
+                                mask = desc->affinity;
+                        else
+                                mask = TARGET_CPUS;
+
 #ifdef CONFIG_INTR_REMAP
-                        else if (intr_remapping_enabled)
-                                set_ir_ioapic_affinity_irq(irq, TARGET_CPUS);
-#endif
+                        if (intr_remapping_enabled)
+                                set_ir_ioapic_affinity_irq(irq, mask);
                         else
-                                set_ioapic_affinity_irq(irq, TARGET_CPUS);
+#endif
+                                set_ioapic_affinity_irq(irq, mask);
                 }
 
         }
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 1c9cc431ea4f..e169ae9b6a62 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -128,7 +128,7 @@ static int kvm_register_clock(char *txt)
 }
 
 #ifdef CONFIG_X86_LOCAL_APIC
-static void __devinit kvm_setup_secondary_clock(void)
+static void __cpuinit kvm_setup_secondary_clock(void)
 {
         /*
          * Now that the first cpu already had this clocksource initialized,
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index f98f4e1dba09..0f4c1fd5a1f4 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -604,6 +604,9 @@ static void __init __get_smp_config(unsigned int early)
                 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
                        "configuration information\n");
 
+        if (!mpf)
+                return;
+
         printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
                mpf->mpf_specification);
 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
diff --git a/arch/x86/kernel/paravirt-spinlocks.c b/arch/x86/kernel/paravirt-spinlocks.c
index 0e9f1982b1dd..95777b0faa73 100644
--- a/arch/x86/kernel/paravirt-spinlocks.c
+++ b/arch/x86/kernel/paravirt-spinlocks.c
@@ -7,7 +7,8 @@
 
 #include <asm/paravirt.h>
 
-static void default_spin_lock_flags(struct raw_spinlock *lock, unsigned long flags)
+static inline void
+default_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags)
 {
         __raw_spin_lock(lock);
 }
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index e1e731d78f38..d28bbdc35e4e 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -1567,7 +1567,7 @@ static int __init calgary_parse_options(char *p)
                                 ++p;
                         if (*p == '\0')
                                 break;
-                        bridge = simple_strtol(p, &endp, 0);
+                        bridge = simple_strtoul(p, &endp, 0);
                         if (p == endp)
                                 break;
 
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index a42b02b4df68..ba7ad83e20a8 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -123,6 +123,8 @@ static void free_iommu(unsigned long offset, int size)
 
         spin_lock_irqsave(&iommu_bitmap_lock, flags);
         iommu_area_free(iommu_gart_bitmap, offset, size);
+        if (offset >= next_bit)
+                next_bit = offset + size;
         spin_unlock_irqrestore(&iommu_bitmap_lock, flags);
 }
 
diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index b13acb75e822..15c3e6999182 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -310,7 +310,7 @@ static void __init setup_xstate_init(void)
 /*
  * Enable and initialize the xsave feature.
  */
-void __init xsave_cntxt_init(void)
+void __ref xsave_cntxt_init(void)
 {
         unsigned int eax, ebx, ecx, edx;