Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / arch / x86_64 / kernel / trampoline.S

diff --git a/arch/x86_64/kernel/trampoline.S b/arch/x86_64/kernel/trampoline.S
index 5ae9f85..23a03eb 100644 (file)
--- a/arch/x86_64/kernel/trampoline.S
+++ b/arch/x86_64/kernel/trampoline.S
@@ -37,40 +37,35 @@ r_base = .
        mov     %cs, %ax        # Code and data in the same place
        mov     %ax, %ds
 
-       mov     $1, %bx         # Flag an SMP trampoline
        cli                     # We should be safe anyway
 
        movl    $0xA5A5A5A5, trampoline_data - r_base
                                # write marker for master knows we're running
 
-       lidt    idt_48 - r_base # load idt with 0, 0
-       lgdt    gdt_48 - r_base # load gdt with whatever is appropriate
+       /*
+        * GDT tables in non default location kernel can be beyond 16MB and
+        * lgdt will not be able to load the address as in real mode default
+        * operand size is 16bit. Use lgdtl instead to force operand size
+        * to 32 bit.
+        */
+
+       lidtl   idt_48 - r_base # load idt with 0, 0
+       lgdtl   gdt_48 - r_base # load gdt with whatever is appropriate
 
-       movw    $__KERNEL_DS,%ax
-       movw    %ax,%ds
-       movw    %ax,%es
-       
        xor     %ax, %ax
        inc     %ax             # protected mode (PE) bit
        lmsw    %ax             # into protected mode
-       jmp     flush_instr
-flush_instr:
-       ljmpl   $__KERNEL32_CS, $0x00100000
-                       # jump to startup_32 in arch/x86_64/kernel/head.S
+       # flaush prefetch and jump to startup_32 in arch/x86_64/kernel/head.S
+       ljmpl   $__KERNEL32_CS, $(startup_32-__START_KERNEL_map)
 
+       # Careful these need to be in the same 64K segment as the above;
 idt_48:
        .word   0                       # idt limit = 0
        .word   0, 0                    # idt base = 0L
 
 gdt_48:
-       .short  0x0800                  # gdt limit = 2048, 256 GDT entries
-       .globl tramp_gdt_ptr
-tramp_gdt_ptr:
-       .long   0                       # gdt base = gdt (first SMP CPU)
-                                       # this is filled in by C because the 64bit
-                                       # linker doesn't support absolute 32bit
-                                       # relocations. 
-       
+       .short  __KERNEL32_CS + 7       # gdt limit
+       .long   cpu_gdt_table-__START_KERNEL_map
 
 .globl trampoline_end
 trampoline_end: