arch/m68k/ifpsp060/os.S

   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,
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  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