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1 | # |
1 | # |
2 | # Copyright (C) 2006 Martin Decky |
2 | # Copyright (C) 2006 Martin Decky |
3 | # All rights reserved. |
3 | # All rights reserved. |
4 | # |
4 | # |
5 | # Redistribution and use in source and binary forms, with or without |
5 | # Redistribution and use in source and binary forms, with or without |
6 | # modification, are permitted provided that the following conditions |
6 | # modification, are permitted provided that the following conditions |
7 | # are met: |
7 | # are met: |
8 | # |
8 | # |
9 | # - Redistributions of source code must retain the above copyright |
9 | # - Redistributions of source code must retain the above copyright |
10 | # notice, this list of conditions and the following disclaimer. |
10 | # notice, this list of conditions and the following disclaimer. |
11 | # - Redistributions in binary form must reproduce the above copyright |
11 | # - Redistributions in binary form must reproduce the above copyright |
12 | # notice, this list of conditions and the following disclaimer in the |
12 | # notice, this list of conditions and the following disclaimer in the |
13 | # documentation and/or other materials provided with the distribution. |
13 | # documentation and/or other materials provided with the distribution. |
14 | # - The name of the author may not be used to endorse or promote products |
14 | # - The name of the author may not be used to endorse or promote products |
15 | # derived from this software without specific prior written permission. |
15 | # derived from this software without specific prior written permission. |
16 | # |
16 | # |
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | # |
27 | # |
28 | 28 | ||
29 | #include "asm.h" |
29 | #include "asm.h" |
30 | #include "regname.h" |
30 | #include "regname.h" |
- | 31 | #include "debug.inc" |
|
31 | 32 | ||
32 | .text |
33 | .text |
33 | 34 | ||
34 | .global halt |
35 | .global halt |
35 | .global memcpy |
36 | .global memcpy |
36 | .global jump_to_kernel |
37 | .global jump_to_kernel |
37 | 38 | ||
38 | halt: |
39 | halt: |
39 | b halt |
40 | b halt |
40 | 41 | ||
41 | memcpy: |
42 | memcpy: |
42 | srwi. r7, r5, 3 |
43 | srwi. r7, r5, 3 |
43 | addi r6, r3, -4 |
44 | addi r6, r3, -4 |
44 | addi r4, r4, -4 |
45 | addi r4, r4, -4 |
45 | beq 2f |
46 | beq 2f |
46 | 47 | ||
47 | andi. r0, r6, 3 |
48 | andi. r0, r6, 3 |
48 | mtctr r7 |
49 | mtctr r7 |
49 | bne 5f |
50 | bne 5f |
50 | 51 | ||
51 | 1: |
52 | 1: |
52 | 53 | ||
53 | lwz r7, 4(r4) |
54 | lwz r7, 4(r4) |
54 | lwzu r8, 8(r4) |
55 | lwzu r8, 8(r4) |
55 | stw r7, 4(r6) |
56 | stw r7, 4(r6) |
56 | stwu r8, 8(r6) |
57 | stwu r8, 8(r6) |
57 | bdnz 1b |
58 | bdnz 1b |
58 | 59 | ||
59 | andi. r5, r5, 7 |
60 | andi. r5, r5, 7 |
60 | 61 | ||
61 | 2: |
62 | 2: |
62 | 63 | ||
63 | cmplwi 0, r5, 4 |
64 | cmplwi 0, r5, 4 |
64 | blt 3f |
65 | blt 3f |
65 | 66 | ||
66 | lwzu r0, 4(r4) |
67 | lwzu r0, 4(r4) |
67 | addi r5, r5, -4 |
68 | addi r5, r5, -4 |
68 | stwu r0, 4(r6) |
69 | stwu r0, 4(r6) |
69 | 70 | ||
70 | 3: |
71 | 3: |
71 | 72 | ||
72 | cmpwi 0, r5, 0 |
73 | cmpwi 0, r5, 0 |
73 | beqlr |
74 | beqlr |
74 | mtctr r5 |
75 | mtctr r5 |
75 | addi r4, r4, 3 |
76 | addi r4, r4, 3 |
76 | addi r6, r6, 3 |
77 | addi r6, r6, 3 |
77 | 78 | ||
78 | 4: |
79 | 4: |
79 | 80 | ||
80 | lbzu r0, 1(r4) |
81 | lbzu r0, 1(r4) |
81 | stbu r0, 1(r6) |
82 | stbu r0, 1(r6) |
82 | bdnz 4b |
83 | bdnz 4b |
83 | blr |
84 | blr |
84 | 85 | ||
85 | 5: |
86 | 5: |
86 | 87 | ||
87 | subfic r0, r0, 4 |
88 | subfic r0, r0, 4 |
88 | mtctr r0 |
89 | mtctr r0 |
89 | 90 | ||
90 | 6: |
91 | 6: |
91 | 92 | ||
92 | lbz r7, 4(r4) |
93 | lbz r7, 4(r4) |
93 | addi r4, r4, 1 |
94 | addi r4, r4, 1 |
94 | stb r7, 4(r6) |
95 | stb r7, 4(r6) |
95 | addi r6, r6, 1 |
96 | addi r6, r6, 1 |
96 | bdnz 6b |
97 | bdnz 6b |
97 | subf r5, r0, r5 |
98 | subf r5, r0, r5 |
98 | rlwinm. r7, r5, 32-3, 3, 31 |
99 | rlwinm. r7, r5, 32-3, 3, 31 |
99 | beq 2b |
100 | beq 2b |
100 | mtctr r7 |
101 | mtctr r7 |
101 | b 1b |
102 | b 1b |
102 | 103 | ||
103 | 104 | ||
104 | jump_to_kernel: |
105 | jump_to_kernel: |
105 | 106 | ||
106 | # r3 = bootinfo (pa) |
107 | # r3 = bootinfo (pa) |
107 | # r4 = bootinfo_size |
108 | # r4 = bootinfo_size |
108 | # r5 = trans (pa) |
109 | # r5 = trans (pa) |
109 | # r6 = bytes to copy |
110 | # r6 = bytes to copy |
110 | # r7 = real_mode (pa) |
111 | # r7 = real_mode (pa) |
- | 112 | # r8 = framebuffer (pa) |
|
- | 113 | # r9 = scanline |
|
111 | 114 | ||
112 | # disable interrupts |
115 | # disable interrupts |
113 | 116 | ||
114 | mfmsr r31 |
117 | mfmsr r31 |
115 | rlwinm r31, r31, 0, 17, 15 |
118 | rlwinm r31, r31, 0, 17, 15 |
116 | mtmsr r31 |
119 | mtmsr r31 |
117 | 120 | ||
118 | # set real_mode meeting point address |
121 | # set real_mode meeting point address |
119 | 122 | ||
120 | mtspr srr0, r7 |
123 | mtspr srr0, r7 |
121 | 124 | ||
122 | # jumps to real_mode |
125 | # jumps to real_mode |
123 | 126 | ||
124 | mfmsr r31 |
127 | mfmsr r31 |
125 | lis r30, ~0@h |
128 | lis r30, ~0@h |
126 | ori r30, r30, ~(msr_ir | msr_dr)@l |
129 | ori r30, r30, ~(msr_ir | msr_dr)@l |
127 | and r31, r31, r30 |
130 | and r31, r31, r30 |
128 | mtspr srr1, r31 |
131 | mtspr srr1, r31 |
129 | 132 | ||
130 | sync |
133 | sync |
131 | isync |
134 | isync |
132 | rfid |
135 | rfid |
133 | 136 | ||
134 | .section REALMODE, "ax" |
137 | .section REALMODE, "ax" |
135 | .align PAGE_WIDTH |
138 | .align PAGE_WIDTH |
136 | .global real_mode |
139 | .global real_mode |
137 | 140 | ||
138 | real_mode: |
141 | real_mode: |
139 | 142 | ||
- | 143 | DEBUG_INIT |
|
- | 144 | DEBUG_real_mode |
|
- | 145 | ||
140 | # copy kernel to proper location |
146 | # copy kernel to proper location |
141 | # |
147 | # |
142 | # r5 = trans (pa) |
148 | # r5 = trans (pa) |
143 | # r6 = bytes to copy |
149 | # r6 = bytes to copy |
- | 150 | # r8 = framebuffer (pa) |
|
- | 151 | # r9 = scanline |
|
144 | 152 | ||
145 | li r31, PAGE_SIZE >> 2 |
153 | li r31, PAGE_SIZE >> 2 |
146 | li r30, 0 |
154 | li r30, 0 |
147 | 155 | ||
148 | page_copy: |
156 | page_copy: |
149 | 157 | ||
150 | cmpwi r6, 0 |
158 | cmpwi r6, 0 |
151 | beq copy_end |
159 | beq copy_end |
152 | 160 | ||
153 | # copy page |
161 | # copy page |
154 | 162 | ||
155 | mtctr r31 |
163 | mtctr r31 |
156 | lwz r29, 0(r5) |
164 | lwz r29, 0(r5) |
157 | 165 | ||
- | 166 | DEBUG_INIT |
|
- | 167 | DEBUG_copy_loop |
|
- | 168 | ||
158 | copy_loop: |
169 | copy_loop: |
159 | 170 | ||
160 | lwz r28, 0(r29) |
171 | lwz r28, 0(r29) |
161 | stw r28, 0(r30) |
172 | stw r28, 0(r30) |
162 | 173 | ||
163 | addi r29, r29, 4 |
174 | addi r29, r29, 4 |
164 | addi r30, r30, 4 |
175 | addi r30, r30, 4 |
165 | subi r6, r6, 4 |
176 | subi r6, r6, 4 |
166 | 177 | ||
167 | cmpwi r6, 0 |
178 | cmpwi r6, 0 |
168 | beq copy_end |
179 | beq copy_end |
169 | 180 | ||
170 | bdnz copy_loop |
181 | bdnz copy_loop |
- | 182 | ||
- | 183 | DEBUG_end_copy_loop |
|
171 | 184 | ||
172 | addi r5, r5, 4 |
185 | addi r5, r5, 4 |
173 | b page_copy |
186 | b page_copy |
174 | 187 | ||
175 | copy_end: |
188 | copy_end: |
176 | 189 | ||
- | 190 | DEBUG_segments |
|
- | 191 | ||
177 | # initially fill segment registers |
192 | # initially fill segment registers |
178 | 193 | ||
179 | li r31, 16 |
- | |
180 | mtctr r31 |
- | |
181 | li r31, 0 |
194 | li r31, 0 |
- | 195 | ||
182 | li r30, 0x2000 |
196 | li r29, 8 |
- | 197 | mtctr r29 |
|
- | 198 | li r30, 0 # ASID 0 (VSIDs 0 .. 7) |
|
183 | 199 | ||
184 | seg_fill: |
200 | seg_fill_uspace: |
- | 201 | ||
- | 202 | mtsrin r30, r31 |
|
- | 203 | addi r30, r30, 1 |
|
- | 204 | addis r31, r31, 0x1000 # move to next SR |
|
- | 205 | ||
- | 206 | bdnz seg_fill_uspace |
|
- | 207 | ||
- | 208 | li r29, 8 |
|
- | 209 | mtctr r29 |
|
- | 210 | lis r30, 0x4000 # priviledged access only |
|
- | 211 | ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15) |
|
- | 212 | ||
- | 213 | seg_fill_kernel: |
|
185 | 214 | ||
186 | mtsrin r30, r31 |
215 | mtsrin r30, r31 |
187 | addi r30, r30, 0x111 |
216 | addi r30, r30, 1 |
188 | addis r31, r31, 0x1000 # move to next SR |
217 | addis r31, r31, 0x1000 # move to next SR |
189 | 218 | ||
190 | bdnz seg_fill |
219 | bdnz seg_fill_kernel |
- | 220 | ||
- | 221 | # create empty Page Hash Table |
|
- | 222 | # on top of memory, size 64 KB |
|
- | 223 | ||
- | 224 | DEBUG_pht |
|
- | 225 | ||
- | 226 | lwz r31, 0(r3) # r31 = memory size |
|
- | 227 | ||
- | 228 | lis r30, 65536@h |
|
- | 229 | ori r30, r30, 65536@l # r30 = 65536 |
|
- | 230 | ||
- | 231 | subi r29, r30, 1 # r29 = 65535 |
|
- | 232 | ||
- | 233 | sub r31, r31, r30 |
|
- | 234 | andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536) |
|
- | 235 | ||
- | 236 | mtsdr1 r31 |
|
- | 237 | ||
- | 238 | li r29, 2 |
|
- | 239 | srw r30, r30, r29 # r30 = 16384 |
|
- | 240 | li r29, 0 |
|
- | 241 | ||
- | 242 | pht_clear: |
|
- | 243 | ||
- | 244 | # write zeroes |
|
- | 245 | ||
- | 246 | stw r29, 0(r31) |
|
- | 247 | ||
- | 248 | addi r31, r31, 4 |
|
- | 249 | subi r30, r30, 4 |
|
- | 250 | ||
- | 251 | cmpwi r30, 0 |
|
- | 252 | beq clear_end |
|
- | 253 | ||
- | 254 | bdnz pht_clear |
|
- | 255 | ||
- | 256 | DEBUG_end_pht_clear |
|
- | 257 | ||
- | 258 | clear_end: |
|
- | 259 | ||
- | 260 | DEBUG_tlb |
|
191 | 261 | ||
192 | tlbia |
262 | tlbia |
193 | tlbsync |
263 | tlbsync |
194 | 264 | ||
- | 265 | DEBUG_prepare |
|
- | 266 | ||
195 | # start the kernel |
267 | # start the kernel |
196 | # |
268 | # |
- | 269 | # pc = KERNEL_START_ADDR |
|
197 | # r3 = bootinfo (pa) |
270 | # r3 = bootinfo (pa) |
- | 271 | # sprg0 = KA2PA(KERNEL_START_ADDR) |
|
- | 272 | # sprg3 = physical memory size |
|
- | 273 | # sp = 0 (pa) |
|
198 | 274 | ||
199 | lis r31, KERNEL_START_ADDR@ha |
275 | lis r31, KERNEL_START_ADDR@ha |
200 | addi r31, r31, KERNEL_START_ADDR@l |
276 | addi r31, r31, KERNEL_START_ADDR@l |
201 | 277 | ||
202 | mtspr srr0, r31 |
278 | mtspr srr0, r31 |
203 | 279 | ||
- | 280 | subis r31, r31, 0x8000 |
|
- | 281 | mtsprg0 r31 |
|
- | 282 | ||
- | 283 | lwz r31, 0(r3) |
|
- | 284 | mtsprg3 r31 |
|
- | 285 | ||
- | 286 | li sp, 0 |
|
- | 287 | ||
204 | mfmsr r31 |
288 | mfmsr r31 |
205 | ori r31, r31, (msr_ir | msr_dr)@l |
289 | ori r31, r31, (msr_ir | msr_dr)@l |
206 | mtspr srr1, r31 |
290 | mtspr srr1, r31 |
207 | 291 | ||
208 | sync |
292 | sync |
209 | isync |
293 | isync |
- | 294 | ||
- | 295 | DEBUG_rfi |
|
210 | rfid |
296 | rfid |
211 | 297 | ||
212 | .align PAGE_WIDTH |
298 | .align PAGE_WIDTH |
213 | .global trans |
299 | .global trans |
214 | trans: |
300 | trans: |
215 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |
301 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |
216 | 302 |