Commit | Line | Data |
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583bb86f NS |
1 | /* |
2 | * relocate_kernel.S for kexec | |
3 | * Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006 | |
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 <asm/asm.h> | |
10 | #include <asm/asmmacro.h> | |
11 | #include <asm/regdef.h> | |
583bb86f NS |
12 | #include <asm/mipsregs.h> |
13 | #include <asm/stackframe.h> | |
14 | #include <asm/addrspace.h> | |
15 | ||
00be0f30 | 16 | LEAF(relocate_new_kernel) |
7aa1c8f4 RB |
17 | PTR_L a0, arg0 |
18 | PTR_L a1, arg1 | |
19 | PTR_L a2, arg2 | |
20 | PTR_L a3, arg3 | |
21 | ||
00be0f30 RB |
22 | PTR_L s0, kexec_indirection_page |
23 | PTR_L s1, kexec_start_address | |
583bb86f NS |
24 | |
25 | process_entry: | |
00be0f30 | 26 | PTR_L s2, (s0) |
a4504755 | 27 | PTR_ADDIU s0, s0, SZREG |
583bb86f | 28 | |
273463b7 PM |
29 | /* |
30 | * In case of a kdump/crash kernel, the indirection page is not | |
31 | * populated as the kernel is directly copied to a reserved location | |
32 | */ | |
33 | beqz s2, done | |
34 | ||
583bb86f | 35 | /* destination page */ |
00be0f30 RB |
36 | and s3, s2, 0x1 |
37 | beq s3, zero, 1f | |
38 | and s4, s2, ~0x1 /* store destination addr in s4 */ | |
00be0f30 | 39 | b process_entry |
583bb86f NS |
40 | |
41 | 1: | |
70342287 | 42 | /* indirection page, update s0 */ |
00be0f30 RB |
43 | and s3, s2, 0x2 |
44 | beq s3, zero, 1f | |
45 | and s0, s2, ~0x2 | |
46 | b process_entry | |
583bb86f NS |
47 | |
48 | 1: | |
49 | /* done page */ | |
00be0f30 RB |
50 | and s3, s2, 0x4 |
51 | beq s3, zero, 1f | |
52 | b done | |
583bb86f NS |
53 | 1: |
54 | /* source page */ | |
00be0f30 RB |
55 | and s3, s2, 0x8 |
56 | beq s3, zero, process_entry | |
57 | and s2, s2, ~0x8 | |
bef9ae3d | 58 | li s6, (1 << _PAGE_SHIFT) / SZREG |
583bb86f NS |
59 | |
60 | copy_word: | |
61 | /* copy page word by word */ | |
00be0f30 RB |
62 | REG_L s5, (s2) |
63 | REG_S s5, (s4) | |
a4504755 JC |
64 | PTR_ADDIU s4, s4, SZREG |
65 | PTR_ADDIU s2, s2, SZREG | |
66 | LONG_ADDIU s6, s6, -1 | |
00be0f30 RB |
67 | beq s6, zero, process_entry |
68 | b copy_word | |
69 | b process_entry | |
583bb86f NS |
70 | |
71 | done: | |
7aa1c8f4 RB |
72 | #ifdef CONFIG_SMP |
73 | /* kexec_flag reset is signal to other CPUs what kernel | |
74 | was moved to it's location. Note - we need relocated address | |
75 | of kexec_flag. */ | |
76 | ||
77 | bal 1f | |
70342287 | 78 | 1: move t1,ra; |
7aa1c8f4 RB |
79 | PTR_LA t2,1b |
80 | PTR_LA t0,kexec_flag | |
81 | PTR_SUB t0,t0,t2; | |
82 | PTR_ADD t0,t1,t0; | |
83 | LONG_S zero,(t0) | |
84 | #endif | |
85 | ||
abe77f90 RB |
86 | #ifdef CONFIG_CPU_CAVIUM_OCTEON |
87 | /* We need to flush I-cache before jumping to new kernel. | |
88 | * Unfortunatelly, this code is cpu-specific. | |
89 | */ | |
90 | .set push | |
91 | .set noreorder | |
92 | syncw | |
93 | syncw | |
94 | synci 0($0) | |
95 | .set pop | |
96 | #else | |
7aa1c8f4 | 97 | sync |
abe77f90 | 98 | #endif |
583bb86f | 99 | /* jump to kexec_start_address */ |
00be0f30 RB |
100 | j s1 |
101 | END(relocate_new_kernel) | |
583bb86f | 102 | |
7aa1c8f4 RB |
103 | #ifdef CONFIG_SMP |
104 | /* | |
105 | * Other CPUs should wait until code is relocated and | |
106 | * then start at entry (?) point. | |
107 | */ | |
108 | LEAF(kexec_smp_wait) | |
109 | PTR_L a0, s_arg0 | |
110 | PTR_L a1, s_arg1 | |
111 | PTR_L a2, s_arg2 | |
112 | PTR_L a3, s_arg3 | |
113 | PTR_L s1, kexec_start_address | |
114 | ||
115 | /* Non-relocated address works for args and kexec_start_address ( old | |
116 | * kernel is not overwritten). But we need relocated address of | |
117 | * kexec_flag. | |
118 | */ | |
119 | ||
120 | bal 1f | |
121 | 1: move t1,ra; | |
122 | PTR_LA t2,1b | |
123 | PTR_LA t0,kexec_flag | |
124 | PTR_SUB t0,t0,t2; | |
125 | PTR_ADD t0,t1,t0; | |
126 | ||
127 | 1: LONG_L s0, (t0) | |
128 | bne s0, zero,1b | |
129 | ||
abe77f90 RB |
130 | #ifdef CONFIG_CPU_CAVIUM_OCTEON |
131 | .set push | |
132 | .set noreorder | |
133 | synci 0($0) | |
134 | .set pop | |
135 | #else | |
7aa1c8f4 | 136 | sync |
abe77f90 | 137 | #endif |
7aa1c8f4 RB |
138 | j s1 |
139 | END(kexec_smp_wait) | |
140 | #endif | |
141 | ||
142 | #ifdef __mips64 | |
143 | /* all PTR's must be aligned to 8 byte in 64-bit mode */ | |
144 | .align 3 | |
145 | #endif | |
146 | ||
147 | /* All parameters to new kernel are passed in registers a0-a3. | |
148 | * kexec_args[0..3] are uses to prepare register values. | |
149 | */ | |
150 | ||
151 | kexec_args: | |
152 | EXPORT(kexec_args) | |
153 | arg0: PTR 0x0 | |
154 | arg1: PTR 0x0 | |
155 | arg2: PTR 0x0 | |
156 | arg3: PTR 0x0 | |
157 | .size kexec_args,PTRSIZE*4 | |
158 | ||
159 | #ifdef CONFIG_SMP | |
160 | /* | |
161 | * Secondary CPUs may have different kernel parameters in | |
162 | * their registers a0-a3. secondary_kexec_args[0..3] are used | |
163 | * to prepare register values. | |
164 | */ | |
165 | secondary_kexec_args: | |
166 | EXPORT(secondary_kexec_args) | |
70342287 RB |
167 | s_arg0: PTR 0x0 |
168 | s_arg1: PTR 0x0 | |
169 | s_arg2: PTR 0x0 | |
170 | s_arg3: PTR 0x0 | |
7aa1c8f4 RB |
171 | .size secondary_kexec_args,PTRSIZE*4 |
172 | kexec_flag: | |
173 | LONG 0x1 | |
174 | ||
175 | #endif | |
176 | ||
583bb86f | 177 | kexec_start_address: |
00be0f30 RB |
178 | EXPORT(kexec_start_address) |
179 | PTR 0x0 | |
180 | .size kexec_start_address, PTRSIZE | |
583bb86f | 181 | |
583bb86f | 182 | kexec_indirection_page: |
00be0f30 RB |
183 | EXPORT(kexec_indirection_page) |
184 | PTR 0 | |
185 | .size kexec_indirection_page, PTRSIZE | |
583bb86f NS |
186 | |
187 | relocate_new_kernel_end: | |
188 | ||
583bb86f | 189 | relocate_new_kernel_size: |
00be0f30 RB |
190 | EXPORT(relocate_new_kernel_size) |
191 | PTR relocate_new_kernel_end - relocate_new_kernel | |
192 | .size relocate_new_kernel_size, PTRSIZE |