1 |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 |MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
3 |M68000 Hi-Performance Microprocessor Division
4 |M68060 Software Package
5 |Production Release P1.00 -- October 10, 1994
6 |
7 |M68060 Software Package Copyright © 1993, 1994 Motorola Inc. All rights reserved.
8 |
9 |THE SOFTWARE is provided on an "AS IS" basis and without warranty.
10 |To the maximum extent permitted by applicable law,
11 |MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
12 |INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
13 |and any warranty against infringement with regard to the SOFTWARE
14 |(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
15 |
16 |To the maximum extent permitted by applicable law,
17 |IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
18 |(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
19 |BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
20 |ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
21 |Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
22 |
23 |You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
24 |so long as this entire notice is retained without alteration in any modified and/or
25 |redistributed versions, and that such modified versions are clearly identified as such.
26 |No licenses are granted by implication, estoppel or otherwise under any patents
27 |or trademarks of Motorola, Inc.
28 |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
29 | os.s
30 |
31 | This file contains:
32 | - example "Call-Out"s required by both the ISP and FPSP.
33 |
34
35 #include <linux/linkage.h>
36
37 |################################
38 | EXAMPLE CALL-OUTS #
39 | #
40 | _060_dmem_write() #
41 | _060_dmem_read() #
42 | _060_imem_read() #
43 | _060_dmem_read_byte() #
44 | _060_dmem_read_word() #
45 | _060_dmem_read_long() #
46 | _060_imem_read_word() #
47 | _060_imem_read_long() #
48 | _060_dmem_write_byte() #
49 | _060_dmem_write_word() #
50 | _060_dmem_write_long() #
51 | #
52 | _060_real_trace() #
53 | _060_real_access() #
54 |################################
55
56 |
57 | Each IO routine checks to see if the memory write/read is to/from user
58 | or supervisor application space. The examples below use simple "move"
59 | instructions for supervisor mode applications and call _copyin()/_copyout()
60 | for user mode applications.
61 | When installing the 060SP, the _copyin()/_copyout() equivalents for a
62 | given operating system should be substituted.
63 |
64 | The addresses within the 060SP are guaranteed to be on the stack.
65 | The result is that Unix processes are allowed to sleep as a consequence
66 | of a page fault during a _copyout.
67 |
68 | Linux/68k: The _060_[id]mem_{read,write}_{byte,word,long} functions
69 | (i.e. all the known length <= 4) are implemented by single moves
70 | statements instead of (more expensive) copy{in,out} calls, if
71 | working in user space
72
73 |
74 | _060_dmem_write():
75 |
76 | Writes to data memory while in supervisor mode.
77 |
78 | INPUTS:
79 | a0 - supervisor source address
80 | a1 - user destination address
81 | d0 - number of bytes to write
82 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
83 | OUTPUTS:
84 | d1 - 0 = success, !0 = failure
85 |
86 .global _060_dmem_write
87 _060_dmem_write:
88 subq.l #1,%d0
89 btst #0x5,0x4(%a6) | check for supervisor state
90 beqs user_write
91 super_write:
92 move.b (%a0)+,(%a1)+ | copy 1 byte
93 dbra %d0,super_write | quit if --ctr < 0
94 clr.l %d1 | return success
95 rts
96 user_write:
97 move.b (%a0)+,%d1 | copy 1 byte
98 copyoutae:
99 movs.b %d1,(%a1)+
100 dbra %d0,user_write | quit if --ctr < 0
101 clr.l %d1 | return success
102 rts
103
104 |
105 | _060_imem_read(), _060_dmem_read():
106 |
107 | Reads from data/instruction memory while in supervisor mode.
108 |
109 | INPUTS:
110 | a0 - user source address
111 | a1 - supervisor destination address
112 | d0 - number of bytes to read
113 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
114 | OUTPUTS:
115 | d1 - 0 = success, !0 = failure
116 |
117 .global _060_imem_read
118 .global _060_dmem_read
119 _060_imem_read:
120 _060_dmem_read:
121 subq.l #1,%d0
122 btst #0x5,0x4(%a6) | check for supervisor state
123 beqs user_read
124 super_read:
125 move.b (%a0)+,(%a1)+ | copy 1 byte
126 dbra %d0,super_read | quit if --ctr < 0
127 clr.l %d1 | return success
128 rts
129 user_read:
130 copyinae:
131 movs.b (%a0)+,%d1
132 move.b %d1,(%a1)+ | copy 1 byte
133 dbra %d0,user_read | quit if --ctr < 0
134 clr.l %d1 | return success
135 rts
136
137 |
138 | _060_dmem_read_byte():
139 |
140 | Read a data byte from user memory.
141 |
142 | INPUTS:
143 | a0 - user source address
144 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
145 | OUTPUTS:
146 | d0 - data byte in d0
147 | d1 - 0 = success, !0 = failure
148 |
149 .global _060_dmem_read_byte
150 _060_dmem_read_byte:
151 clr.l %d0 | clear whole longword
152 clr.l %d1 | assume success
153 btst #0x5,0x4(%a6) | check for supervisor state
154 bnes dmrbs | supervisor
155 dmrbuae:movs.b (%a0),%d0 | fetch user byte
156 rts
157 dmrbs: move.b (%a0),%d0 | fetch super byte
158 rts
159
160 |
161 | _060_dmem_read_word():
162 |
163 | Read a data word from user memory.
164 |
165 | INPUTS:
166 | a0 - user source address
167 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
168 | OUTPUTS:
169 | d0 - data word in d0
170 | d1 - 0 = success, !0 = failure
171 |
172 | _060_imem_read_word():
173 |
174 | Read an instruction word from user memory.
175 |
176 | INPUTS:
177 | a0 - user source address
178 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
179 | OUTPUTS:
180 | d0 - instruction word in d0
181 | d1 - 0 = success, !0 = failure
182 |
183 .global _060_dmem_read_word
184 .global _060_imem_read_word
185 _060_dmem_read_word:
186 _060_imem_read_word:
187 clr.l %d1 | assume success
188 clr.l %d0 | clear whole longword
189 btst #0x5,0x4(%a6) | check for supervisor state
190 bnes dmrws | supervisor
191 dmrwuae:movs.w (%a0), %d0 | fetch user word
192 rts
193 dmrws: move.w (%a0), %d0 | fetch super word
194 rts
195
196 |
197 | _060_dmem_read_long():
198 |
199
200 |
201 | INPUTS:
202 | a0 - user source address
203 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
204 | OUTPUTS:
205 | d0 - data longword in d0
206 | d1 - 0 = success, !0 = failure
207 |
208 | _060_imem_read_long():
209 |
210 | Read an instruction longword from user memory.
211 |
212 | INPUTS:
213 | a0 - user source address
214 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
215 | OUTPUTS:
216 | d0 - instruction longword in d0
217 | d1 - 0 = success, !0 = failure
218 |
219 .global _060_dmem_read_long
220 .global _060_imem_read_long
221 _060_dmem_read_long:
222 _060_imem_read_long:
223 clr.l %d1 | assume success
224 btst #0x5,0x4(%a6) | check for supervisor state
225 bnes dmrls | supervisor
226 dmrluae:movs.l (%a0),%d0 | fetch user longword
227 rts
228 dmrls: move.l (%a0),%d0 | fetch super longword
229 rts
230
231 |
232 | _060_dmem_write_byte():
233 |
234 | Write a data byte to user memory.
235 |
236 | INPUTS:
237 | a0 - user destination address
238 | d0 - data byte in d0
239 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
240 | OUTPUTS:
241 | d1 - 0 = success, !0 = failure
242 |
243 .global _060_dmem_write_byte
244 _060_dmem_write_byte:
245 clr.l %d1 | assume success
246 btst #0x5,0x4(%a6) | check for supervisor state
247 bnes dmwbs | supervisor
248 dmwbuae:movs.b %d0,(%a0) | store user byte
249 rts
250 dmwbs: move.b %d0,(%a0) | store super byte
251 rts
252
253 |
254 | _060_dmem_write_word():
255 |
256 | Write a data word to user memory.
257 |
258 | INPUTS:
259 | a0 - user destination address
260 | d0 - data word in d0
261 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
262 | OUTPUTS:
263 | d1 - 0 = success, !0 = failure
264 |
265 .global _060_dmem_write_word
266 _060_dmem_write_word:
267 clr.l %d1 | assume success
268 btst #0x5,0x4(%a6) | check for supervisor state
269 bnes dmwws | supervisor
270 dmwwu:
271 dmwwuae:movs.w %d0,(%a0) | store user word
272 bras dmwwr
273 dmwws: move.w %d0,(%a0) | store super word
274 dmwwr: clr.l %d1 | return success
275 rts
276
277 |
278 | _060_dmem_write_long():
279 |
280 | Write a data longword to user memory.
281 |
282 | INPUTS:
283 | a0 - user destination address
284 | d0 - data longword in d0
285 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
286 | OUTPUTS:
287 | d1 - 0 = success, !0 = failure
288 |
289 .global _060_dmem_write_long
290 _060_dmem_write_long:
291 clr.l %d1 | assume success
292 btst #0x5,0x4(%a6) | check for supervisor state
293 bnes dmwls | supervisor
294 dmwluae:movs.l %d0,(%a0) | store user longword
295 rts
296 dmwls: move.l %d0,(%a0) | store super longword
297 rts
298
299
300 #if 0
301 |###############################################
302
303 |
304 | Use these routines if your kernel doesn't have _copyout/_copyin equivalents.
305 | Assumes that D0/D1/A0/A1 are scratch registers. The _copyin/_copyout
306 | below assume that the SFC/DFC have been set previously.
307 |
308 | Linux/68k: These are basically non-inlined versions of
309 | memcpy_{to,from}fs, but without long-transfer optimization
310 | Note: Assumed that SFC/DFC are pointing correctly to user data
311 | space... Should be right, or are there any exceptions?
312
313 |
314 | int _copyout(supervisor_addr, user_addr, nbytes)
315 |
316 .global _copyout
317 _copyout:
318 move.l 4(%sp),%a0 | source
319 move.l 8(%sp),%a1 | destination
320 move.l 12(%sp),%d0 | count
321 subq.l #1,%d0
322 moreout:
323 move.b (%a0)+,%d1 | fetch supervisor byte
324 copyoutae:
325 movs.b %d1,(%a1)+ | store user byte
326 dbra %d0,moreout | are we through yet?
327 moveq #0,%d0 | return success
328 rts
329
330 |
331 | int _copyin(user_addr, supervisor_addr, nbytes)
332 |
333 .global _copyin
334 _copyin:
335 move.l 4(%sp),%a0 | source
336 move.l 8(%sp),%a1 | destination
337 move.l 12(%sp),%d0 | count
338 subq.l #1,%d0
339 morein:
340 copyinae:
341 movs.b (%a0)+,%d1 | fetch user byte
342 move.b %d1,(%a1)+ | write supervisor byte
343 dbra %d0,morein | are we through yet?
344 moveq #0,%d0 | return success
345 rts
346 #endif
347
348 |###########################################################################
349
350 |
351 | _060_real_trace():
352 |
353 | This is the exit point for the 060FPSP when an instruction is being traced
354 | and there are no other higher priority exceptions pending for this instruction
355 | or they have already been processed.
356 |
357 | The sample code below simply executes an "rte".
358 |
359 .global _060_real_trace
360 _060_real_trace:
361 bral trap
362
363 |
364 | _060_real_access():
365 |
366 | This is the exit point for the 060FPSP when an access error exception
367 | is encountered. The routine below should point to the operating system
368 | handler for access error exceptions. The exception stack frame is an
369 | 8-word access error frame.
370 |
371 | The sample routine below simply executes an "rte" instruction which
372 | is most likely the incorrect thing to do and could put the system
373 | into an infinite loop.
374 |
375 .global _060_real_access
376 _060_real_access:
377 bral buserr
378
379
380
381 | Execption handling for movs access to illegal memory
382 .section .fixup,#alloc,#execinstr
383 .even
384 1: moveq #-1,%d1
385 rts
386 .section __ex_table,#alloc
387 .align 4
388 .long dmrbuae,1b
389 .long dmrwuae,1b
390 .long dmrluae,1b
391 .long dmwbuae,1b
392 .long dmwwuae,1b
393 .long dmwluae,1b
394 .long copyoutae,1b
395 .long copyinae,1b
396 .text