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-rw-r--r--arch/x86/kernel/trampoline_64.S23
1 files changed, 11 insertions, 12 deletions
diff --git a/arch/x86/kernel/trampoline_64.S b/arch/x86/kernel/trampoline_64.S
index 894293c598d..cddfb8d386b 100644
--- a/arch/x86/kernel/trampoline_64.S
+++ b/arch/x86/kernel/trampoline_64.S
@@ -25,10 +25,11 @@
25 */ 25 */
26 26
27#include <linux/linkage.h> 27#include <linux/linkage.h>
28#include <asm/pgtable.h> 28#include <asm/pgtable_types.h>
29#include <asm/page.h> 29#include <asm/page_types.h>
30#include <asm/msr.h> 30#include <asm/msr.h>
31#include <asm/segment.h> 31#include <asm/segment.h>
32#include <asm/processor-flags.h>
32 33
33.section .rodata, "a", @progbits 34.section .rodata, "a", @progbits
34 35
@@ -37,7 +38,7 @@
37ENTRY(trampoline_data) 38ENTRY(trampoline_data)
38r_base = . 39r_base = .
39 cli # We should be safe anyway 40 cli # We should be safe anyway
40 wbinvd 41 wbinvd
41 mov %cs, %ax # Code and data in the same place 42 mov %cs, %ax # Code and data in the same place
42 mov %ax, %ds 43 mov %ax, %ds
43 mov %ax, %es 44 mov %ax, %es
@@ -73,9 +74,8 @@ r_base = .
73 lidtl tidt - r_base # load idt with 0, 0 74 lidtl tidt - r_base # load idt with 0, 0
74 lgdtl tgdt - r_base # load gdt with whatever is appropriate 75 lgdtl tgdt - r_base # load gdt with whatever is appropriate
75 76
76 xor %ax, %ax 77 mov $X86_CR0_PE, %ax # protected mode (PE) bit
77 inc %ax # protected mode (PE) bit 78 lmsw %ax # into protected mode
78 lmsw %ax # into protected mode
79 79
80 # flush prefetch and jump to startup_32 80 # flush prefetch and jump to startup_32
81 ljmpl *(startup_32_vector - r_base) 81 ljmpl *(startup_32_vector - r_base)
@@ -86,9 +86,8 @@ startup_32:
86 movl $__KERNEL_DS, %eax # Initialize the %ds segment register 86 movl $__KERNEL_DS, %eax # Initialize the %ds segment register
87 movl %eax, %ds 87 movl %eax, %ds
88 88
89 xorl %eax, %eax 89 movl $X86_CR4_PAE, %eax
90 btsl $5, %eax # Enable PAE mode 90 movl %eax, %cr4 # Enable PAE mode
91 movl %eax, %cr4
92 91
93 # Setup trampoline 4 level pagetables 92 # Setup trampoline 4 level pagetables
94 leal (trampoline_level4_pgt - r_base)(%esi), %eax 93 leal (trampoline_level4_pgt - r_base)(%esi), %eax
@@ -99,9 +98,9 @@ startup_32:
99 xorl %edx, %edx 98 xorl %edx, %edx
100 wrmsr 99 wrmsr
101 100
102 xorl %eax, %eax 101 # Enable paging and in turn activate Long Mode
103 btsl $31, %eax # Enable paging and in turn activate Long Mode 102 # Enable protected mode
104 btsl $0, %eax # Enable protected mode 103 movl $(X86_CR0_PG | X86_CR0_PE), %eax
105 movl %eax, %cr0 104 movl %eax, %cr0
106 105
107 /* 106 /*