Merge branch 'master' of /usr/src/ntfs-2.6/

[sfrench/cifs-2.6.git] / arch / i386 / kernel / cpu / common.c

diff --git a/arch/i386/kernel/cpu/common.c b/arch/i386/kernel/cpu/common.c
index 15aee26ec2b6308be3d9e9f7e0e47f120be11fe1..e6bd095ae1085e75234d10aebdec2ac3d2190e43 100644 (file)
--- a/arch/i386/kernel/cpu/common.c
+++ b/arch/i386/kernel/cpu/common.c
@@ -4,6 +4,7 @@
 #include <linux/smp.h>
 #include <linux/module.h>
 #include <linux/percpu.h>
+#include <linux/bootmem.h>
 #include <asm/semaphore.h>
 #include <asm/processor.h>
 #include <asm/i387.h>
@@ -18,6 +19,9 @@
 
 #include "cpu.h"
 
+DEFINE_PER_CPU(struct Xgt_desc_struct, cpu_gdt_descr);
+EXPORT_PER_CPU_SYMBOL(cpu_gdt_descr);
+
 DEFINE_PER_CPU(unsigned char, cpu_16bit_stack[CPU_16BIT_STACK_SIZE]);
 EXPORT_PER_CPU_SYMBOL(cpu_16bit_stack);
 
@@ -44,6 +48,7 @@ static void default_init(struct cpuinfo_x86 * c)
 
 static struct cpu_dev default_cpu = {
        .c_init = default_init,
+       .c_vendor = "Unknown",
 };
 static struct cpu_dev * this_cpu = &default_cpu;
 
@@ -150,6 +155,7 @@ static void __devinit get_cpu_vendor(struct cpuinfo_x86 *c, int early)
 {
        char *v = c->x86_vendor_id;
        int i;
+       static int printed;
 
        for (i = 0; i < X86_VENDOR_NUM; i++) {
                if (cpu_devs[i]) {
@@ -159,10 +165,17 @@ static void __devinit get_cpu_vendor(struct cpuinfo_x86 *c, int early)
                                c->x86_vendor = i;
                                if (!early)
                                        this_cpu = cpu_devs[i];
-                               break;
+                               return;
                        }
                }
        }
+       if (!printed) {
+               printed++;
+               printk(KERN_ERR "CPU: Vendor unknown, using generic init.\n");
+               printk(KERN_ERR "CPU: Your system may be unstable.\n");
+       }
+       c->x86_vendor = X86_VENDOR_UNKNOWN;
+       this_cpu = &default_cpu;
 }
 
 
@@ -265,10 +278,10 @@ void __devinit generic_identify(struct cpuinfo_x86 * c)
                        c->x86_capability[4] = excap;
                        c->x86 = (tfms >> 8) & 15;
                        c->x86_model = (tfms >> 4) & 15;
-                       if (c->x86 == 0xf) {
+                       if (c->x86 == 0xf)
                                c->x86 += (tfms >> 20) & 0xff;
+                       if (c->x86 >= 0x6)
                                c->x86_model += ((tfms >> 16) & 0xF) << 4;
-                       } 
                        c->x86_mask = tfms & 15;
                } else {
                        /* Have CPUID level 0 only - unheard of */
@@ -562,8 +575,9 @@ void __devinit cpu_init(void)
        int cpu = smp_processor_id();
        struct tss_struct * t = &per_cpu(init_tss, cpu);
        struct thread_struct *thread = &current->thread;
-       struct desc_struct *gdt = get_cpu_gdt_table(cpu);
+       struct desc_struct *gdt;
        __u32 stk16_off = (__u32)&per_cpu(cpu_16bit_stack, cpu);
+       struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, cpu);
 
        if (cpu_test_and_set(cpu, cpu_initialized)) {
                printk(KERN_WARNING "CPU#%d already initialized!\n", cpu);
@@ -580,6 +594,25 @@ void __devinit cpu_init(void)
                set_in_cr4(X86_CR4_TSD);
        }
 
+       /*
+        * This is a horrible hack to allocate the GDT.  The problem
+        * is that cpu_init() is called really early for the boot CPU
+        * (and hence needs bootmem) but much later for the secondary
+        * CPUs, when bootmem will have gone away
+        */
+       if (NODE_DATA(0)->bdata->node_bootmem_map) {
+               gdt = (struct desc_struct *)alloc_bootmem_pages(PAGE_SIZE);
+               /* alloc_bootmem_pages panics on failure, so no check */
+               memset(gdt, 0, PAGE_SIZE);
+       } else {
+               gdt = (struct desc_struct *)get_zeroed_page(GFP_KERNEL);
+               if (unlikely(!gdt)) {
+                       printk(KERN_CRIT "CPU%d failed to allocate GDT\n", cpu);
+                       for (;;)
+                               local_irq_enable();
+               }
+       }
+
        /*
         * Initialize the per-CPU GDT with the boot GDT,
         * and set up the GDT descriptor:
@@ -592,10 +625,10 @@ void __devinit cpu_init(void)
                ((((__u64)stk16_off) << 32) & 0xff00000000000000ULL) |
                (CPU_16BIT_STACK_SIZE - 1);
 
-       cpu_gdt_descr[cpu].size = GDT_SIZE - 1;
-       cpu_gdt_descr[cpu].address = (unsigned long)gdt;
+       cpu_gdt_descr->size = GDT_SIZE - 1;
+       cpu_gdt_descr->address = (unsigned long)gdt;
 
-       load_gdt(&cpu_gdt_descr[cpu]);
+       load_gdt(cpu_gdt_descr);
        load_idt(&idt_descr);
 
        /*