Rev 1478 | Rev 1964 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
913 | decky | 1 | # |
2 | # Copyright (C) 2006 Martin Decky |
||
3 | # All rights reserved. |
||
4 | # |
||
5 | # Redistribution and use in source and binary forms, with or without |
||
6 | # modification, are permitted provided that the following conditions |
||
7 | # are met: |
||
8 | # |
||
9 | # - Redistributions of source code must retain the above copyright |
||
10 | # notice, this list of conditions and the following disclaimer. |
||
11 | # - Redistributions in binary form must reproduce the above copyright |
||
12 | # notice, this list of conditions and the following disclaimer in the |
||
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 |
||
15 | # derived from this software without specific prior written permission. |
||
16 | # |
||
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 |
||
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
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 |
||
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 |
||
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
27 | # |
||
28 | |||
1058 | decky | 29 | #include "asm.h" |
913 | decky | 30 | #include "regname.h" |
1478 | decky | 31 | #include "debug.inc" |
913 | decky | 32 | |
33 | .text |
||
34 | |||
1058 | decky | 35 | .global halt |
1075 | decky | 36 | .global memcpy |
913 | decky | 37 | .global jump_to_kernel |
38 | |||
1058 | decky | 39 | halt: |
40 | b halt |
||
913 | decky | 41 | |
1075 | decky | 42 | memcpy: |
43 | srwi. r7, r5, 3 |
||
44 | addi r6, r3, -4 |
||
45 | addi r4, r4, -4 |
||
46 | beq 2f |
||
47 | |||
48 | andi. r0, r6, 3 |
||
49 | mtctr r7 |
||
50 | bne 5f |
||
51 | |||
52 | 1: |
||
53 | |||
54 | lwz r7, 4(r4) |
||
55 | lwzu r8, 8(r4) |
||
56 | stw r7, 4(r6) |
||
57 | stwu r8, 8(r6) |
||
58 | bdnz 1b |
||
59 | |||
60 | andi. r5, r5, 7 |
||
61 | |||
62 | 2: |
||
63 | |||
64 | cmplwi 0, r5, 4 |
||
65 | blt 3f |
||
66 | |||
67 | lwzu r0, 4(r4) |
||
68 | addi r5, r5, -4 |
||
69 | stwu r0, 4(r6) |
||
70 | |||
71 | 3: |
||
72 | |||
73 | cmpwi 0, r5, 0 |
||
74 | beqlr |
||
75 | mtctr r5 |
||
76 | addi r4, r4, 3 |
||
77 | addi r6, r6, 3 |
||
78 | |||
79 | 4: |
||
80 | |||
81 | lbzu r0, 1(r4) |
||
82 | stbu r0, 1(r6) |
||
83 | bdnz 4b |
||
84 | blr |
||
85 | |||
86 | 5: |
||
87 | |||
88 | subfic r0, r0, 4 |
||
89 | mtctr r0 |
||
90 | |||
91 | 6: |
||
92 | |||
93 | lbz r7, 4(r4) |
||
94 | addi r4, r4, 1 |
||
95 | stb r7, 4(r6) |
||
96 | addi r6, r6, 1 |
||
97 | bdnz 6b |
||
98 | subf r5, r0, r5 |
||
99 | rlwinm. r7, r5, 32-3, 3, 31 |
||
100 | beq 2b |
||
101 | mtctr r7 |
||
102 | b 1b |
||
103 | |||
104 | |||
913 | decky | 105 | jump_to_kernel: |
1022 | decky | 106 | |
1131 | decky | 107 | # r3 = bootinfo (pa) |
108 | # r4 = bootinfo_size |
||
109 | # r5 = trans (pa) |
||
1372 | decky | 110 | # r6 = bytes to copy |
111 | # r7 = real_mode (pa) |
||
1478 | decky | 112 | # r8 = framebuffer (pa) |
113 | # r9 = scanline |
||
1022 | decky | 114 | |
1216 | decky | 115 | # disable interrupts |
116 | |||
117 | mfmsr r31 |
||
118 | rlwinm r31, r31, 0, 17, 15 |
||
119 | mtmsr r31 |
||
120 | |||
121 | # set real_mode meeting point address |
||
122 | |||
1372 | decky | 123 | mtspr srr0, r7 |
1022 | decky | 124 | |
125 | # jumps to real_mode |
||
126 | |||
1058 | decky | 127 | mfmsr r31 |
128 | lis r30, ~0@h |
||
1478 | decky | 129 | ori r30, r30, ~(msr_ir | msr_dr | msr_ee)@l |
1058 | decky | 130 | and r31, r31, r30 |
131 | mtspr srr1, r31 |
||
1157 | decky | 132 | |
133 | sync |
||
134 | isync |
||
1022 | decky | 135 | rfi |
136 | |||
1214 | decky | 137 | .section REALMODE, "ax" |
1058 | decky | 138 | .align PAGE_WIDTH |
1022 | decky | 139 | .global real_mode |
140 | |||
141 | real_mode: |
||
1479 | decky | 142 | |
143 | DEBUG_INIT |
||
1478 | decky | 144 | DEBUG_real_mode |
1058 | decky | 145 | |
146 | # copy kernel to proper location |
||
147 | # |
||
1131 | decky | 148 | # r5 = trans (pa) |
1372 | decky | 149 | # r6 = bytes to copy |
1478 | decky | 150 | # r8 = framebuffer (pa) |
151 | # r9 = scanline |
||
1058 | decky | 152 | |
1068 | decky | 153 | li r31, PAGE_SIZE >> 2 |
1058 | decky | 154 | li r30, 0 |
155 | |||
156 | page_copy: |
||
157 | |||
1131 | decky | 158 | cmpwi r6, 0 |
1058 | decky | 159 | beq copy_end |
160 | |||
1068 | decky | 161 | # copy page |
1058 | decky | 162 | |
163 | mtctr r31 |
||
1131 | decky | 164 | lwz r29, 0(r5) |
1058 | decky | 165 | |
1479 | decky | 166 | DEBUG_INIT |
167 | DEBUG_copy_loop |
||
168 | |||
1058 | decky | 169 | copy_loop: |
170 | |||
171 | lwz r28, 0(r29) |
||
172 | stw r28, 0(r30) |
||
173 | |||
174 | addi r29, r29, 4 |
||
175 | addi r30, r30, 4 |
||
1131 | decky | 176 | subi r6, r6, 4 |
1058 | decky | 177 | |
1131 | decky | 178 | cmpwi r6, 0 |
1068 | decky | 179 | beq copy_end |
180 | |||
1058 | decky | 181 | bdnz copy_loop |
1479 | decky | 182 | |
183 | DEBUG_end_copy_loop |
||
1058 | decky | 184 | |
1131 | decky | 185 | addi r5, r5, 4 |
1058 | decky | 186 | b page_copy |
187 | |||
188 | copy_end: |
||
1068 | decky | 189 | |
1479 | decky | 190 | DEBUG_segments |
191 | |||
1214 | decky | 192 | # initially fill segment registers |
1022 | decky | 193 | |
1071 | decky | 194 | li r31, 16 |
195 | mtctr r31 |
||
196 | li r31, 0 |
||
1214 | decky | 197 | li r30, 0x2000 |
1071 | decky | 198 | |
1022 | decky | 199 | seg_fill: |
200 | |||
1071 | decky | 201 | mtsrin r30, r31 |
1214 | decky | 202 | addi r30, r30, 0x111 |
1071 | decky | 203 | addis r31, r31, 0x1000 # move to next SR |
204 | |||
205 | bdnz seg_fill |
||
1022 | decky | 206 | |
1068 | decky | 207 | # invalidate block address translation registers |
208 | |||
1479 | decky | 209 | DEBUG_bat |
210 | |||
1373 | decky | 211 | li r30, 0 |
212 | |||
1068 | decky | 213 | mtspr ibat0u, r30 |
214 | mtspr ibat0l, r30 |
||
215 | |||
216 | mtspr ibat1u, r30 |
||
217 | mtspr ibat1l, r30 |
||
218 | |||
219 | mtspr ibat2u, r30 |
||
220 | mtspr ibat2l, r30 |
||
221 | |||
222 | mtspr ibat3u, r30 |
||
223 | mtspr ibat3l, r30 |
||
224 | |||
225 | mtspr dbat0u, r30 |
||
226 | mtspr dbat0l, r30 |
||
227 | |||
228 | mtspr dbat1u, r30 |
||
229 | mtspr dbat1l, r30 |
||
230 | |||
231 | mtspr dbat2u, r30 |
||
232 | mtspr dbat2l, r30 |
||
233 | |||
234 | mtspr dbat3u, r30 |
||
235 | mtspr dbat3l, r30 |
||
236 | |||
1058 | decky | 237 | # create identity mapping |
238 | |||
1479 | decky | 239 | DEBUG_mapping |
240 | |||
1068 | decky | 241 | # FIXME: map exactly the size of RAM |
242 | |||
243 | lis r31, 0x8000 |
||
244 | ori r31, r31, 0x0ffe |
||
245 | |||
246 | lis r30, 0x0000 |
||
247 | ori r30, r30, 0x0002 |
||
248 | |||
249 | mtspr ibat0u, r31 |
||
250 | mtspr ibat0l, r30 |
||
251 | |||
252 | mtspr dbat0u, r31 |
||
253 | mtspr dbat0l, r30 |
||
254 | |||
1479 | decky | 255 | DEBUG_tlb |
256 | |||
1058 | decky | 257 | tlbia |
1381 | decky | 258 | tlbsync |
1058 | decky | 259 | |
1479 | decky | 260 | DEBUG_prepare |
261 | |||
1058 | decky | 262 | # start the kernel |
1022 | decky | 263 | # |
1131 | decky | 264 | # r3 = bootinfo (pa) |
1022 | decky | 265 | |
1058 | decky | 266 | lis r31, KERNEL_START_ADDR@ha |
267 | addi r31, r31, KERNEL_START_ADDR@l |
||
1022 | decky | 268 | |
1058 | decky | 269 | mtspr srr0, r31 |
1022 | decky | 270 | |
1058 | decky | 271 | mfmsr r31 |
272 | ori r31, r31, (msr_ir | msr_dr)@l |
||
273 | mtspr srr1, r31 |
||
274 | |||
1146 | decky | 275 | sync |
276 | isync |
||
1478 | decky | 277 | |
278 | DEBUG_rfi |
||
1022 | decky | 279 | rfi |
1058 | decky | 280 | |
281 | .align PAGE_WIDTH |
||
282 | .global trans |
||
283 | trans: |
||
284 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |