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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 | #include "debug.inc" |
32 | 32 | ||
33 | .text |
33 | .text |
34 | 34 | ||
35 | .global halt |
35 | .global halt |
36 | .global memcpy |
36 | .global memcpy |
37 | .global jump_to_kernel |
37 | .global jump_to_kernel |
38 | 38 | ||
39 | halt: |
39 | halt: |
40 | b halt |
40 | b halt |
41 | 41 | ||
42 | memcpy: |
42 | memcpy: |
43 | srwi. r7, r5, 3 |
43 | srwi. r7, r5, 3 |
44 | addi r6, r3, -4 |
44 | addi r6, r3, -4 |
45 | addi r4, r4, -4 |
45 | addi r4, r4, -4 |
46 | beq 2f |
46 | beq 2f |
47 | 47 | ||
48 | andi. r0, r6, 3 |
48 | andi. r0, r6, 3 |
49 | mtctr r7 |
49 | mtctr r7 |
50 | bne 5f |
50 | bne 5f |
51 | 51 | ||
52 | 1: |
52 | 1: |
53 | 53 | ||
54 | lwz r7, 4(r4) |
54 | lwz r7, 4(r4) |
55 | lwzu r8, 8(r4) |
55 | lwzu r8, 8(r4) |
56 | stw r7, 4(r6) |
56 | stw r7, 4(r6) |
57 | stwu r8, 8(r6) |
57 | stwu r8, 8(r6) |
58 | bdnz 1b |
58 | bdnz 1b |
59 | 59 | ||
60 | andi. r5, r5, 7 |
60 | andi. r5, r5, 7 |
61 | 61 | ||
62 | 2: |
62 | 2: |
63 | 63 | ||
64 | cmplwi 0, r5, 4 |
64 | cmplwi 0, r5, 4 |
65 | blt 3f |
65 | blt 3f |
66 | 66 | ||
67 | lwzu r0, 4(r4) |
67 | lwzu r0, 4(r4) |
68 | addi r5, r5, -4 |
68 | addi r5, r5, -4 |
69 | stwu r0, 4(r6) |
69 | stwu r0, 4(r6) |
70 | 70 | ||
71 | 3: |
71 | 3: |
72 | 72 | ||
73 | cmpwi 0, r5, 0 |
73 | cmpwi 0, r5, 0 |
74 | beqlr |
74 | beqlr |
75 | mtctr r5 |
75 | mtctr r5 |
76 | addi r4, r4, 3 |
76 | addi r4, r4, 3 |
77 | addi r6, r6, 3 |
77 | addi r6, r6, 3 |
78 | 78 | ||
79 | 4: |
79 | 4: |
80 | 80 | ||
81 | lbzu r0, 1(r4) |
81 | lbzu r0, 1(r4) |
82 | stbu r0, 1(r6) |
82 | stbu r0, 1(r6) |
83 | bdnz 4b |
83 | bdnz 4b |
84 | blr |
84 | blr |
85 | 85 | ||
86 | 5: |
86 | 5: |
87 | 87 | ||
88 | subfic r0, r0, 4 |
88 | subfic r0, r0, 4 |
89 | mtctr r0 |
89 | mtctr r0 |
90 | 90 | ||
91 | 6: |
91 | 6: |
92 | 92 | ||
93 | lbz r7, 4(r4) |
93 | lbz r7, 4(r4) |
94 | addi r4, r4, 1 |
94 | addi r4, r4, 1 |
95 | stb r7, 4(r6) |
95 | stb r7, 4(r6) |
96 | addi r6, r6, 1 |
96 | addi r6, r6, 1 |
97 | bdnz 6b |
97 | bdnz 6b |
98 | subf r5, r0, r5 |
98 | subf r5, r0, r5 |
99 | rlwinm. r7, r5, 32-3, 3, 31 |
99 | rlwinm. r7, r5, 32-3, 3, 31 |
100 | beq 2b |
100 | beq 2b |
101 | mtctr r7 |
101 | mtctr r7 |
102 | b 1b |
102 | b 1b |
103 | 103 | ||
104 | 104 | ||
105 | jump_to_kernel: |
105 | jump_to_kernel: |
106 | 106 | ||
107 | # r3 = bootinfo (pa) |
107 | # r3 = bootinfo (pa) |
108 | # r4 = bootinfo_size |
108 | # r4 = bootinfo_size |
109 | # r5 = trans (pa) |
109 | # r5 = trans (pa) |
110 | # r6 = bytes to copy |
110 | # r6 = bytes to copy |
111 | # r7 = real_mode (pa) |
111 | # r7 = real_mode (pa) |
112 | # r8 = framebuffer (pa) |
112 | # r8 = framebuffer (pa) |
113 | # r9 = scanline |
113 | # r9 = scanline |
114 | 114 | ||
115 | # disable interrupts |
115 | # disable interrupts |
116 | 116 | ||
117 | mfmsr r31 |
117 | mfmsr r31 |
118 | rlwinm r31, r31, 0, 17, 15 |
118 | rlwinm r31, r31, 0, 17, 15 |
119 | mtmsr r31 |
119 | mtmsr r31 |
120 | 120 | ||
121 | # set real_mode meeting point address |
121 | # set real_mode meeting point address |
122 | 122 | ||
123 | mtspr srr0, r7 |
123 | mtspr srr0, r7 |
124 | 124 | ||
125 | # jumps to real_mode |
125 | # jumps to real_mode |
126 | 126 | ||
127 | mfmsr r31 |
127 | mfmsr r31 |
128 | lis r30, ~0@h |
128 | lis r30, ~0@h |
129 | ori r30, r30, ~(msr_ir | msr_dr)@l |
129 | ori r30, r30, ~(msr_ir | msr_dr)@l |
130 | and r31, r31, r30 |
130 | and r31, r31, r30 |
131 | mtspr srr1, r31 |
131 | mtspr srr1, r31 |
132 | 132 | ||
133 | sync |
133 | sync |
134 | isync |
134 | isync |
135 | rfid |
135 | rfid |
136 | 136 | ||
137 | .section REALMODE, "ax" |
137 | .section REALMODE, "ax" |
138 | .align PAGE_WIDTH |
138 | .align PAGE_WIDTH |
139 | .global real_mode |
139 | .global real_mode |
140 | 140 | ||
141 | real_mode: |
141 | real_mode: |
142 | 142 | ||
143 | DEBUG_INIT |
143 | DEBUG_INIT |
144 | DEBUG_real_mode |
144 | DEBUG_real_mode |
145 | 145 | ||
146 | # copy kernel to proper location |
146 | # copy kernel to proper location |
147 | # |
147 | # |
148 | # r5 = trans (pa) |
148 | # r5 = trans (pa) |
149 | # r6 = bytes to copy |
149 | # r6 = bytes to copy |
150 | # r8 = framebuffer (pa) |
150 | # r8 = framebuffer (pa) |
151 | # r9 = scanline |
151 | # r9 = scanline |
152 | 152 | ||
153 | li r31, PAGE_SIZE >> 2 |
153 | li r31, PAGE_SIZE >> 2 |
154 | li r30, 0 |
154 | li r30, 0 |
155 | 155 | ||
156 | page_copy: |
156 | page_copy: |
157 | 157 | ||
158 | cmpwi r6, 0 |
158 | cmpwi r6, 0 |
159 | beq copy_end |
159 | beq copy_end |
160 | 160 | ||
161 | # copy page |
161 | # copy page |
162 | 162 | ||
163 | mtctr r31 |
163 | mtctr r31 |
164 | lwz r29, 0(r5) |
164 | lwz r29, 0(r5) |
165 | 165 | ||
166 | DEBUG_INIT |
166 | DEBUG_INIT |
167 | DEBUG_copy_loop |
167 | DEBUG_copy_loop |
168 | 168 | ||
169 | copy_loop: |
169 | copy_loop: |
170 | 170 | ||
171 | lwz r28, 0(r29) |
171 | lwz r28, 0(r29) |
172 | stw r28, 0(r30) |
172 | stw r28, 0(r30) |
173 | 173 | ||
174 | addi r29, r29, 4 |
174 | addi r29, r29, 4 |
175 | addi r30, r30, 4 |
175 | addi r30, r30, 4 |
176 | subi r6, r6, 4 |
176 | subi r6, r6, 4 |
177 | 177 | ||
178 | cmpwi r6, 0 |
178 | cmpwi r6, 0 |
179 | beq copy_end |
179 | beq copy_end |
180 | 180 | ||
181 | bdnz copy_loop |
181 | bdnz copy_loop |
182 | 182 | ||
183 | DEBUG_end_copy_loop |
183 | DEBUG_end_copy_loop |
184 | 184 | ||
185 | addi r5, r5, 4 |
185 | addi r5, r5, 4 |
186 | b page_copy |
186 | b page_copy |
187 | 187 | ||
188 | copy_end: |
188 | copy_end: |
189 | 189 | ||
190 | DEBUG_segments |
190 | DEBUG_segments |
191 | 191 | ||
192 | # initially fill segment registers |
192 | # initially fill segment registers |
193 | 193 | ||
194 | li r31, 0 |
194 | li r31, 0 |
195 | 195 | ||
196 | li r29, 8 |
196 | li r29, 8 |
197 | mtctr r29 |
197 | mtctr r29 |
198 | li r30, 0 # ASID 0 (VSIDs 0 .. 7) |
198 | li r30, 0 # ASID 0 (VSIDs 0 .. 7) |
199 | 199 | ||
200 | seg_fill_uspace: |
200 | seg_fill_uspace: |
201 | 201 | ||
202 | mtsrin r30, r31 |
202 | mtsrin r30, r31 |
203 | addi r30, r30, 1 |
203 | addi r30, r30, 1 |
204 | addis r31, r31, 0x1000 # move to next SR |
204 | addis r31, r31, 0x1000 # move to next SR |
205 | 205 | ||
206 | bdnz seg_fill_uspace |
206 | bdnz seg_fill_uspace |
207 | 207 | ||
208 | li r29, 8 |
208 | li r29, 8 |
209 | mtctr r29 |
209 | mtctr r29 |
210 | lis r30, 0x4000 # priviledged access only |
210 | lis r30, 0x4000 # priviledged access only |
211 | ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15) |
211 | ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15) |
212 | 212 | ||
213 | seg_fill_kernel: |
213 | seg_fill_kernel: |
214 | 214 | ||
215 | mtsrin r30, r31 |
215 | mtsrin r30, r31 |
216 | addi r30, r30, 1 |
216 | addi r30, r30, 1 |
217 | addis r31, r31, 0x1000 # move to next SR |
217 | addis r31, r31, 0x1000 # move to next SR |
218 | 218 | ||
219 | bdnz seg_fill_kernel |
219 | bdnz seg_fill_kernel |
220 | 220 | ||
221 | # create empty Page Hash Table |
221 | # create empty Page Hash Table |
222 | # on top of memory, size 64 KB |
222 | # on top of memory, size 64 KB |
223 | 223 | ||
224 | DEBUG_pht |
224 | DEBUG_pht |
225 | 225 | ||
226 | lwz r31, 0(r3) # r31 = memory size |
226 | lwz r31, 0(r3) # r31 = memory size |
227 | 227 | ||
228 | lis r30, 65536@h |
228 | lis r30, 65536@h |
229 | ori r30, r30, 65536@l # r30 = 65536 |
229 | ori r30, r30, 65536@l # r30 = 65536 |
230 | 230 | ||
231 | subi r29, r30, 1 # r29 = 65535 |
231 | subi r29, r30, 1 # r29 = 65535 |
232 | 232 | ||
233 | sub r31, r31, r30 |
233 | sub r31, r31, r30 |
234 | andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536) |
234 | andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536) |
235 | 235 | ||
236 | mtsdr1 r31 |
236 | mtsdr1 r31 |
237 | 237 | ||
238 | li r29, 2 |
238 | li r29, 2 |
239 | srw r30, r30, r29 # r30 = 16384 |
239 | srw r30, r30, r29 # r30 = 16384 |
240 | li r29, 0 |
240 | li r29, 0 |
241 | 241 | ||
242 | pht_clear: |
242 | pht_clear: |
243 | 243 | ||
244 | # write zeroes |
244 | # write zeroes |
245 | 245 | ||
246 | stw r29, 0(r31) |
246 | stw r29, 0(r31) |
247 | 247 | ||
248 | addi r31, r31, 4 |
248 | addi r31, r31, 4 |
249 | subi r30, r30, 4 |
249 | subi r30, r30, 4 |
250 | 250 | ||
251 | cmpwi r30, 0 |
251 | cmpwi r30, 0 |
252 | beq clear_end |
252 | beq clear_end |
253 | 253 | ||
254 | bdnz pht_clear |
254 | bdnz pht_clear |
255 | 255 | ||
256 | DEBUG_end_pht_clear |
256 | DEBUG_end_pht_clear |
257 | 257 | ||
258 | clear_end: |
258 | clear_end: |
259 | 259 | ||
260 | DEBUG_tlb |
260 | DEBUG_tlb |
261 | 261 | ||
262 | tlbia |
262 | tlbia |
263 | tlbsync |
263 | tlbsync |
264 | 264 | ||
265 | DEBUG_prepare |
265 | DEBUG_prepare |
266 | 266 | ||
267 | # start the kernel |
267 | # start the kernel |
268 | # |
268 | # |
269 | # pc = KERNEL_START_ADDR |
269 | # pc = KERNEL_START_ADDR |
270 | # r3 = bootinfo (pa) |
270 | # r3 = bootinfo (pa) |
271 | # sprg0 = KA2PA(KERNEL_START_ADDR) |
271 | # sprg0 = KA2PA(KERNEL_START_ADDR) |
272 | # sprg3 = physical memory size |
272 | # sprg3 = physical memory size |
273 | # sp = 0 (pa) |
273 | # sp = 0 (pa) |
274 | 274 | ||
275 | lis r31, KERNEL_START_ADDR@ha |
275 | lis r31, KERNEL_START_ADDR@ha |
276 | addi r31, r31, KERNEL_START_ADDR@l |
276 | addi r31, r31, KERNEL_START_ADDR@l |
277 | 277 | ||
278 | mtspr srr0, r31 |
278 | mtspr srr0, r31 |
279 | 279 | ||
280 | subis r31, r31, 0x8000 |
280 | subis r31, r31, 0x8000 |
281 | mtsprg0 r31 |
281 | mtsprg0 r31 |
282 | 282 | ||
283 | lwz r31, 0(r3) |
283 | lwz r31, 0(r3) |
284 | mtsprg3 r31 |
284 | mtsprg3 r31 |
285 | 285 | ||
286 | li sp, 0 |
286 | li sp, 0 |
287 | 287 | ||
288 | mfmsr r31 |
288 | mfmsr r31 |
289 | ori r31, r31, (msr_ir | msr_dr)@l |
289 | ori r31, r31, (msr_ir | msr_dr)@l |
290 | mtspr srr1, r31 |
290 | mtspr srr1, r31 |
291 | 291 | ||
292 | sync |
292 | sync |
293 | isync |
293 | isync |
294 | 294 | ||
295 | DEBUG_rfi |
295 | DEBUG_rfi |
296 | rfid |
296 | rfid |
297 | 297 | ||
298 | .align PAGE_WIDTH |
298 | .align PAGE_WIDTH |
299 | .global trans |
299 | .global trans |
300 | trans: |
300 | trans: |
301 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |
301 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |
302 | 302 |