Merge x86-64 update from Andi

1 files changed, 10 insertions, 4 deletions

diff --git a/arch/x86_64/kernel/head64.c b/arch/x86_64/kernel/head64.c
index cf6ab147a2a5..b675c5add01e 100644
--- a/arch/x86_64/kernel/head64.c
+++ b/arch/x86_64/kernel/head64.c
@@ -19,14 +19,15 @@
 #include <asm/bootsetup.h>
 #include <asm/setup.h>
 #include <asm/desc.h>
+#include <asm/pgtable.h>
+#include <asm/sections.h>
 
 /* Don't add a printk in there. printk relies on the PDA which is not initialized 
    yet. */
 static void __init clear_bss(void)
 {
-        extern char __bss_start[], __bss_end[];
         memset(__bss_start, 0,
-               (unsigned long) __bss_end - (unsigned long) __bss_start);
+               (unsigned long) __bss_stop - (unsigned long) __bss_start);
 }
 
 #define NEW_CL_POINTER          0x228   /* Relative to real mode data */
@@ -75,8 +76,6 @@ static void __init setup_boot_cpu_data(void)
         boot_cpu_data.x86_mask = eax & 0xf;
 }
 
-extern char _end[];
-
 void __init x86_64_start_kernel(char * real_mode_data)
 {
         char *s;
@@ -86,6 +85,13 @@ void __init x86_64_start_kernel(char * real_mode_data)
                 set_intr_gate(i, early_idt_handler);
         asm volatile("lidt %0" :: "m" (idt_descr));
         clear_bss();
+
+        /*
+         * switch to init_level4_pgt from boot_level4_pgt
+         */
+        memcpy(init_level4_pgt, boot_level4_pgt, PTRS_PER_PGD*sizeof(pgd_t));
+        asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt)));
+
         pda_init(0);
         copy_bootdata(real_mode_data);
 #ifdef CONFIG_SMP