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5234f5eb EB |
1 | /* |
2 | * relocate_kernel.S - put the kernel image in place to boot | |
3 | * Copyright (C) 2002-2005 Eric Biederman <ebiederm@xmission.com> | |
4 | * | |
5 | * This source code is licensed under the GNU General Public License, | |
6 | * Version 2. See the file COPYING for more details. | |
7 | */ | |
8 | ||
9 | #include <linux/linkage.h> | |
4bfaaef0 MD |
10 | #include <asm/page.h> |
11 | #include <asm/kexec.h> | |
fd3af531 | 12 | #include <asm/processor-flags.h> |
366932de | 13 | #include <asm/pgtable.h> |
5234f5eb | 14 | |
4bfaaef0 MD |
15 | /* |
16 | * Must be relocatable PIC code callable as a C function | |
17 | */ | |
18 | ||
19 | #define PTR(x) (x << 3) | |
366932de | 20 | #define PAGE_ATTR (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY) |
4bfaaef0 MD |
21 | |
22 | .text | |
288621e3 | 23 | .align PAGE_SIZE |
5234f5eb | 24 | .code64 |
4bfaaef0 MD |
25 | .globl relocate_kernel |
26 | relocate_kernel: | |
27 | /* %rdi indirection_page | |
28 | * %rsi page_list | |
29 | * %rdx start address | |
30 | */ | |
31 | ||
32 | /* map the control page at its virtual address */ | |
33 | ||
34 | movq $0x0000ff8000000000, %r10 /* mask */ | |
35 | mov $(39 - 3), %cl /* bits to shift */ | |
36 | movq PTR(VA_CONTROL_PAGE)(%rsi), %r11 /* address to map */ | |
37 | ||
38 | movq %r11, %r9 | |
39 | andq %r10, %r9 | |
40 | shrq %cl, %r9 | |
41 | ||
42 | movq PTR(VA_PGD)(%rsi), %r8 | |
43 | addq %r8, %r9 | |
44 | movq PTR(PA_PUD_0)(%rsi), %r8 | |
45 | orq $PAGE_ATTR, %r8 | |
46 | movq %r8, (%r9) | |
47 | ||
48 | shrq $9, %r10 | |
49 | sub $9, %cl | |
50 | ||
51 | movq %r11, %r9 | |
52 | andq %r10, %r9 | |
53 | shrq %cl, %r9 | |
54 | ||
55 | movq PTR(VA_PUD_0)(%rsi), %r8 | |
56 | addq %r8, %r9 | |
57 | movq PTR(PA_PMD_0)(%rsi), %r8 | |
58 | orq $PAGE_ATTR, %r8 | |
59 | movq %r8, (%r9) | |
60 | ||
61 | shrq $9, %r10 | |
62 | sub $9, %cl | |
63 | ||
64 | movq %r11, %r9 | |
65 | andq %r10, %r9 | |
66 | shrq %cl, %r9 | |
67 | ||
68 | movq PTR(VA_PMD_0)(%rsi), %r8 | |
69 | addq %r8, %r9 | |
70 | movq PTR(PA_PTE_0)(%rsi), %r8 | |
71 | orq $PAGE_ATTR, %r8 | |
72 | movq %r8, (%r9) | |
73 | ||
74 | shrq $9, %r10 | |
75 | sub $9, %cl | |
76 | ||
77 | movq %r11, %r9 | |
78 | andq %r10, %r9 | |
79 | shrq %cl, %r9 | |
80 | ||
81 | movq PTR(VA_PTE_0)(%rsi), %r8 | |
82 | addq %r8, %r9 | |
83 | movq PTR(PA_CONTROL_PAGE)(%rsi), %r8 | |
84 | orq $PAGE_ATTR, %r8 | |
85 | movq %r8, (%r9) | |
86 | ||
87 | /* identity map the control page at its physical address */ | |
88 | ||
89 | movq $0x0000ff8000000000, %r10 /* mask */ | |
90 | mov $(39 - 3), %cl /* bits to shift */ | |
91 | movq PTR(PA_CONTROL_PAGE)(%rsi), %r11 /* address to map */ | |
92 | ||
93 | movq %r11, %r9 | |
94 | andq %r10, %r9 | |
95 | shrq %cl, %r9 | |
96 | ||
97 | movq PTR(VA_PGD)(%rsi), %r8 | |
98 | addq %r8, %r9 | |
99 | movq PTR(PA_PUD_1)(%rsi), %r8 | |
100 | orq $PAGE_ATTR, %r8 | |
101 | movq %r8, (%r9) | |
102 | ||
103 | shrq $9, %r10 | |
104 | sub $9, %cl | |
105 | ||
106 | movq %r11, %r9 | |
107 | andq %r10, %r9 | |
108 | shrq %cl, %r9 | |
109 | ||
110 | movq PTR(VA_PUD_1)(%rsi), %r8 | |
111 | addq %r8, %r9 | |
112 | movq PTR(PA_PMD_1)(%rsi), %r8 | |
113 | orq $PAGE_ATTR, %r8 | |
114 | movq %r8, (%r9) | |
115 | ||
116 | shrq $9, %r10 | |
117 | sub $9, %cl | |
118 | ||
119 | movq %r11, %r9 | |
120 | andq %r10, %r9 | |
121 | shrq %cl, %r9 | |
122 | ||
123 | movq PTR(VA_PMD_1)(%rsi), %r8 | |
124 | addq %r8, %r9 | |
125 | movq PTR(PA_PTE_1)(%rsi), %r8 | |
126 | orq $PAGE_ATTR, %r8 | |
127 | movq %r8, (%r9) | |
128 | ||
129 | shrq $9, %r10 | |
130 | sub $9, %cl | |
131 | ||
132 | movq %r11, %r9 | |
133 | andq %r10, %r9 | |
134 | shrq %cl, %r9 | |
135 | ||
136 | movq PTR(VA_PTE_1)(%rsi), %r8 | |
137 | addq %r8, %r9 | |
138 | movq PTR(PA_CONTROL_PAGE)(%rsi), %r8 | |
139 | orq $PAGE_ATTR, %r8 | |
140 | movq %r8, (%r9) | |
141 | ||
5234f5eb | 142 | relocate_new_kernel: |
4bfaaef0 MD |
143 | /* %rdi indirection_page |
144 | * %rsi page_list | |
5234f5eb | 145 | * %rdx start address |
5234f5eb EB |
146 | */ |
147 | ||
148 | /* zero out flags, and disable interrupts */ | |
149 | pushq $0 | |
150 | popfq | |
151 | ||
4bfaaef0 MD |
152 | /* get physical address of control page now */ |
153 | /* this is impossible after page table switch */ | |
154 | movq PTR(PA_CONTROL_PAGE)(%rsi), %r8 | |
155 | ||
156 | /* get physical address of page table now too */ | |
157 | movq PTR(PA_TABLE_PAGE)(%rsi), %rcx | |
5234f5eb | 158 | |
4bfaaef0 MD |
159 | /* switch to new set of page tables */ |
160 | movq PTR(PA_PGD)(%rsi), %r9 | |
161 | movq %r9, %cr3 | |
162 | ||
163 | /* setup a new stack at the end of the physical control page */ | |
a7bba17b | 164 | lea PAGE_SIZE(%r8), %rsp |
4bfaaef0 MD |
165 | |
166 | /* jump to identity mapped page */ | |
167 | addq $(identity_mapped - relocate_kernel), %r8 | |
168 | pushq %r8 | |
169 | ret | |
170 | ||
171 | identity_mapped: | |
172 | /* store the start address on the stack */ | |
173 | pushq %rdx | |
5234f5eb EB |
174 | |
175 | /* Set cr0 to a known state: | |
fd3af531 | 176 | * - Paging enabled |
177 | * - Alignment check disabled | |
178 | * - Write protect disabled | |
179 | * - No task switch | |
180 | * - Don't do FP software emulation. | |
181 | * - Proctected mode enabled | |
5234f5eb EB |
182 | */ |
183 | movq %cr0, %rax | |
fd3af531 | 184 | andq $~(X86_CR0_AM | X86_CR0_WP | X86_CR0_TS | X86_CR0_EM), %rax |
185 | orl $(X86_CR0_PG | X86_CR0_PE), %eax | |
5234f5eb EB |
186 | movq %rax, %cr0 |
187 | ||
188 | /* Set cr4 to a known state: | |
fd3af531 | 189 | * - physical address extension enabled |
5234f5eb | 190 | */ |
fd3af531 | 191 | movq $X86_CR4_PAE, %rax |
5234f5eb EB |
192 | movq %rax, %cr4 |
193 | ||
194 | jmp 1f | |
195 | 1: | |
196 | ||
197 | /* Switch to the identity mapped page tables, | |
198 | * and flush the TLB. | |
199 | */ | |
200 | movq %rcx, %cr3 | |
201 | ||
202 | /* Do the copies */ | |
203 | movq %rdi, %rcx /* Put the page_list in %rcx */ | |
204 | xorq %rdi, %rdi | |
205 | xorq %rsi, %rsi | |
206 | jmp 1f | |
207 | ||
208 | 0: /* top, read another word for the indirection page */ | |
209 | ||
210 | movq (%rbx), %rcx | |
211 | addq $8, %rbx | |
212 | 1: | |
213 | testq $0x1, %rcx /* is it a destination page? */ | |
214 | jz 2f | |
215 | movq %rcx, %rdi | |
216 | andq $0xfffffffffffff000, %rdi | |
217 | jmp 0b | |
218 | 2: | |
219 | testq $0x2, %rcx /* is it an indirection page? */ | |
220 | jz 2f | |
221 | movq %rcx, %rbx | |
222 | andq $0xfffffffffffff000, %rbx | |
223 | jmp 0b | |
224 | 2: | |
225 | testq $0x4, %rcx /* is it the done indicator? */ | |
226 | jz 2f | |
227 | jmp 3f | |
228 | 2: | |
229 | testq $0x8, %rcx /* is it the source indicator? */ | |
230 | jz 0b /* Ignore it otherwise */ | |
231 | movq %rcx, %rsi /* For ever source page do a copy */ | |
232 | andq $0xfffffffffffff000, %rsi | |
233 | ||
234 | movq $512, %rcx | |
235 | rep ; movsq | |
236 | jmp 0b | |
237 | 3: | |
238 | ||
239 | /* To be certain of avoiding problems with self-modifying code | |
240 | * I need to execute a serializing instruction here. | |
241 | * So I flush the TLB by reloading %cr3 here, it's handy, | |
242 | * and not processor dependent. | |
243 | */ | |
244 | movq %cr3, %rax | |
245 | movq %rax, %cr3 | |
246 | ||
247 | /* set all of the registers to known values */ | |
248 | /* leave %rsp alone */ | |
249 | ||
250 | xorq %rax, %rax | |
251 | xorq %rbx, %rbx | |
252 | xorq %rcx, %rcx | |
253 | xorq %rdx, %rdx | |
254 | xorq %rsi, %rsi | |
255 | xorq %rdi, %rdi | |
256 | xorq %rbp, %rbp | |
257 | xorq %r8, %r8 | |
258 | xorq %r9, %r9 | |
259 | xorq %r10, %r9 | |
260 | xorq %r11, %r11 | |
261 | xorq %r12, %r12 | |
262 | xorq %r13, %r13 | |
263 | xorq %r14, %r14 | |
264 | xorq %r15, %r15 | |
265 | ||
266 | ret |