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-rw-r--r--arch/i386/kernel/relocate_kernel.S162
1 files changed, 147 insertions, 15 deletions
diff --git a/arch/i386/kernel/relocate_kernel.S b/arch/i386/kernel/relocate_kernel.S
index d312616effa1..f151d6fae462 100644
--- a/arch/i386/kernel/relocate_kernel.S
+++ b/arch/i386/kernel/relocate_kernel.S
@@ -7,16 +7,138 @@
7 */ 7 */
8 8
9#include <linux/linkage.h> 9#include <linux/linkage.h>
10#include <asm/page.h>
11#include <asm/kexec.h>
12
13/*
14 * Must be relocatable PIC code callable as a C function
15 */
16
17#define PTR(x) (x << 2)
18#define PAGE_ALIGNED (1 << PAGE_SHIFT)
19#define PAGE_ATTR 0x63 /* _PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY */
20#define PAE_PGD_ATTR 0x01 /* _PAGE_PRESENT */
21
22 .text
23 .align PAGE_ALIGNED
24 .globl relocate_kernel
25relocate_kernel:
26 movl 8(%esp), %ebp /* list of pages */
27
28#ifdef CONFIG_X86_PAE
29 /* map the control page at its virtual address */
30
31 movl PTR(VA_PGD)(%ebp), %edi
32 movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
33 andl $0xc0000000, %eax
34 shrl $27, %eax
35 addl %edi, %eax
36
37 movl PTR(PA_PMD_0)(%ebp), %edx
38 orl $PAE_PGD_ATTR, %edx
39 movl %edx, (%eax)
40
41 movl PTR(VA_PMD_0)(%ebp), %edi
42 movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
43 andl $0x3fe00000, %eax
44 shrl $18, %eax
45 addl %edi, %eax
46
47 movl PTR(PA_PTE_0)(%ebp), %edx
48 orl $PAGE_ATTR, %edx
49 movl %edx, (%eax)
50
51 movl PTR(VA_PTE_0)(%ebp), %edi
52 movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
53 andl $0x001ff000, %eax
54 shrl $9, %eax
55 addl %edi, %eax
56
57 movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
58 orl $PAGE_ATTR, %edx
59 movl %edx, (%eax)
60
61 /* identity map the control page at its physical address */
62
63 movl PTR(VA_PGD)(%ebp), %edi
64 movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
65 andl $0xc0000000, %eax
66 shrl $27, %eax
67 addl %edi, %eax
68
69 movl PTR(PA_PMD_1)(%ebp), %edx
70 orl $PAE_PGD_ATTR, %edx
71 movl %edx, (%eax)
72
73 movl PTR(VA_PMD_1)(%ebp), %edi
74 movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
75 andl $0x3fe00000, %eax
76 shrl $18, %eax
77 addl %edi, %eax
78
79 movl PTR(PA_PTE_1)(%ebp), %edx
80 orl $PAGE_ATTR, %edx
81 movl %edx, (%eax)
82
83 movl PTR(VA_PTE_1)(%ebp), %edi
84 movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
85 andl $0x001ff000, %eax
86 shrl $9, %eax
87 addl %edi, %eax
88
89 movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
90 orl $PAGE_ATTR, %edx
91 movl %edx, (%eax)
92#else
93 /* map the control page at its virtual address */
94
95 movl PTR(VA_PGD)(%ebp), %edi
96 movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
97 andl $0xffc00000, %eax
98 shrl $20, %eax
99 addl %edi, %eax
100
101 movl PTR(PA_PTE_0)(%ebp), %edx
102 orl $PAGE_ATTR, %edx
103 movl %edx, (%eax)
104
105 movl PTR(VA_PTE_0)(%ebp), %edi
106 movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
107 andl $0x003ff000, %eax
108 shrl $10, %eax
109 addl %edi, %eax
110
111 movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
112 orl $PAGE_ATTR, %edx
113 movl %edx, (%eax)
114
115 /* identity map the control page at its physical address */
116
117 movl PTR(VA_PGD)(%ebp), %edi
118 movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
119 andl $0xffc00000, %eax
120 shrl $20, %eax
121 addl %edi, %eax
122
123 movl PTR(PA_PTE_1)(%ebp), %edx
124 orl $PAGE_ATTR, %edx
125 movl %edx, (%eax)
126
127 movl PTR(VA_PTE_1)(%ebp), %edi
128 movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
129 andl $0x003ff000, %eax
130 shrl $10, %eax
131 addl %edi, %eax
132
133 movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
134 orl $PAGE_ATTR, %edx
135 movl %edx, (%eax)
136#endif
10 137
11 /*
12 * Must be relocatable PIC code callable as a C function, that once
13 * it starts can not use the previous processes stack.
14 */
15 .globl relocate_new_kernel
16relocate_new_kernel: 138relocate_new_kernel:
17 /* read the arguments and say goodbye to the stack */ 139 /* read the arguments and say goodbye to the stack */
18 movl 4(%esp), %ebx /* page_list */ 140 movl 4(%esp), %ebx /* page_list */
19 movl 8(%esp), %ebp /* reboot_code_buffer */ 141 movl 8(%esp), %ebp /* list of pages */
20 movl 12(%esp), %edx /* start address */ 142 movl 12(%esp), %edx /* start address */
21 movl 16(%esp), %ecx /* cpu_has_pae */ 143 movl 16(%esp), %ecx /* cpu_has_pae */
22 144
@@ -24,11 +146,26 @@ relocate_new_kernel:
24 pushl $0 146 pushl $0
25 popfl 147 popfl
26 148
27 /* set a new stack at the bottom of our page... */ 149 /* get physical address of control page now */
28 lea 4096(%ebp), %esp 150 /* this is impossible after page table switch */
151 movl PTR(PA_CONTROL_PAGE)(%ebp), %edi
29 152
30 /* store the parameters back on the stack */ 153 /* switch to new set of page tables */
31 pushl %edx /* store the start address */ 154 movl PTR(PA_PGD)(%ebp), %eax
155 movl %eax, %cr3
156
157 /* setup a new stack at the end of the physical control page */
158 lea 4096(%edi), %esp
159
160 /* jump to identity mapped page */
161 movl %edi, %eax
162 addl $(identity_mapped - relocate_kernel), %eax
163 pushl %eax
164 ret
165
166identity_mapped:
167 /* store the start address on the stack */
168 pushl %edx
32 169
33 /* Set cr0 to a known state: 170 /* Set cr0 to a known state:
34 * 31 0 == Paging disabled 171 * 31 0 == Paging disabled
@@ -113,8 +250,3 @@ relocate_new_kernel:
113 xorl %edi, %edi 250 xorl %edi, %edi
114 xorl %ebp, %ebp 251 xorl %ebp, %ebp
115 ret 252 ret
116relocate_new_kernel_end:
117
118 .globl relocate_new_kernel_size
119relocate_new_kernel_size:
120 .long relocate_new_kernel_end - relocate_new_kernel
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