x86_64: fix section mismatch warning in hpet.c

[safe/jmp/linux-2.6] / arch / x86_64 / kernel / head64.c

diff --git a/arch/x86_64/kernel/head64.c b/arch/x86_64/kernel/head64.c
index cc230b9..6c34bdd 100644 (file)
--- a/arch/x86_64/kernel/head64.c
+++ b/arch/x86_64/kernel/head64.c
@@ -18,8 +18,16 @@
 #include <asm/setup.h>
 #include <asm/desc.h>
 #include <asm/pgtable.h>
+#include <asm/tlbflush.h>
 #include <asm/sections.h>
 
+static void __init zap_identity_mappings(void)
+{
+       pgd_t *pgd = pgd_offset_k(0UL);
+       pgd_clear(pgd);
+       __flush_tlb();
+}
+
 /* Don't add a printk in there. printk relies on the PDA which is not initialized 
    yet. */
 static void __init clear_bss(void)
@@ -29,28 +37,25 @@ static void __init clear_bss(void)
 }
 
 #define NEW_CL_POINTER         0x228   /* Relative to real mode data */
-#define OLD_CL_MAGIC_ADDR      0x90020
+#define OLD_CL_MAGIC_ADDR      0x20
 #define OLD_CL_MAGIC            0xA33F
-#define OLD_CL_BASE_ADDR        0x90000
-#define OLD_CL_OFFSET           0x90022
-
-extern char saved_command_line[];
+#define OLD_CL_OFFSET           0x22
 
 static void __init copy_bootdata(char *real_mode_data)
 {
-       int new_data;
+       unsigned long new_data;
        char * command_line;
 
        memcpy(x86_boot_params, real_mode_data, BOOT_PARAM_SIZE);
-       new_data = *(int *) (x86_boot_params + NEW_CL_POINTER);
+       new_data = *(u32 *) (x86_boot_params + NEW_CL_POINTER);
        if (!new_data) {
-               if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) {
+               if (OLD_CL_MAGIC != *(u16 *)(real_mode_data + OLD_CL_MAGIC_ADDR)) {
                        return;
                }
-               new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET;
+               new_data = __pa(real_mode_data) + *(u16 *)(real_mode_data + OLD_CL_OFFSET);
        }
-       command_line = (char *) ((u64)(new_data));
-       memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
+       command_line = __va(new_data);
+       memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 }
 
 void __init x86_64_start_kernel(char * real_mode_data)
@@ -60,23 +65,20 @@ void __init x86_64_start_kernel(char * real_mode_data)
        /* clear bss before set_intr_gate with early_idt_handler */
        clear_bss();
 
+       /* Make NULL pointers segfault */
+       zap_identity_mappings();
+
        for (i = 0; i < IDT_ENTRIES; i++)
                set_intr_gate(i, early_idt_handler);
        asm volatile("lidt %0" :: "m" (idt_descr));
 
        early_printk("Kernel alive\n");
 
-       /*
-        * 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)));
-
        for (i = 0; i < NR_CPUS; i++)
                cpu_pda(i) = &boot_cpu_pda[i];
 
        pda_init(0);
-       copy_bootdata(real_mode_data);
+       copy_bootdata(__va(real_mode_data));
 #ifdef CONFIG_SMP
        cpu_set(0, cpu_online_map);
 #endif