|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
|M68000 Hi-Performance Microprocessor Division
|M68060 Software Package
|Production Release P1.00 -- October 10, 1994
|
|M68060 Software Package Copyright © 1993, 1994 Motorola Inc. All rights reserved.
|
|THE SOFTWARE is provided on an "AS IS" basis and without warranty.
|To the maximum extent permitted by applicable law,
|MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
|INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
|and any warranty against infringement with regard to the SOFTWARE
|(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
|
|To the maximum extent permitted by applicable law,
|IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
|(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
|BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
|ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
|Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
|
|You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
|so long as this entire notice is retained without alteration in any modified and/or
|redistributed versions, and that such modified versions are clearly identified as such.
|No licenses are granted by implication, estoppel or otherwise under any patents
|or trademarks of Motorola, Inc.
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| os.s
|
| This file contains:
| - example "Call-Out"s required by both the ISP and FPSP.
|
#include <linux/linkage.h>
|################################
| EXAMPLE CALL-OUTS #
| #
| _060_dmem_write() #
| _060_dmem_read() #
| _060_imem_read() #
| _060_dmem_read_byte() #
| _060_dmem_read_word() #
| _060_dmem_read_long() #
| _060_imem_read_word() #
| _060_imem_read_long() #
| _060_dmem_write_byte() #
| _060_dmem_write_word() #
| _060_dmem_write_long() #
| #
| _060_real_trace() #
| _060_real_access() #
|################################
|
| Each IO routine checks to see if the memory write/read is to/from user
| or supervisor application space. The examples below use simple "move"
| instructions for supervisor mode applications and call _copyin()/_copyout()
| for user mode applications.
| When installing the 060SP, the _copyin()/_copyout() equivalents for a
| given operating system should be substituted.
|
| The addresses within the 060SP are guaranteed to be on the stack.
| The result is that Unix processes are allowed to sleep as a consequence
| of a page fault during a _copyout.
|
| Linux/68k: The _060_[id]mem_{read,write}_{byte,word,long} functions
| (i.e. all the known length <= 4) are implemented by single moves
| statements instead of (more expensive) copy{in,out} calls, if
| working in user space
|
| _060_dmem_write():
|
| Writes to data memory while in supervisor mode.
|
| INPUTS:
| a0 - supervisor source address
| a1 - user destination address
| d0 - number of bytes to write
| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
| d1 - 0 = success, !0 = failure
|
.global _060_dmem_write
_060_dmem_write:
subq.l #1,%d0
btst #0x5,0x4(%a6) | check for supervisor state
beqs user_write
super_write:
move.b (%a0)+,(%a1)+ | copy 1 byte
dbra %d0,super_write | quit if --ctr < 0
clr.l %d1 | return success
rts
user_write:
move.b (%a0)+,%d1 | copy 1 byte
copyoutae:
movs.b %d1,(%a1)+
dbra %d0,user_write | quit if --ctr < 0
clr.l %d1 | return success
rts
|
| _060_imem_read(), _060_dmem_read():
|
| Reads from data/instruction memory while in supervisor mode.
|
| INPUTS:
| a0 - user source address
| a1 - supervisor destination address
| d0 - number of bytes to read
| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
| d1 - 0 = success, !0 = failure
|
.global _060_imem_read
.global _060_dmem_read
_060_imem_read:
_060_dmem_read:
subq.l #1,%d0
btst #0x5,0x4(%a6) | check for supervisor state
beqs user_read
super_read:
move.b (%a0)+,(%a1)+ | copy 1 byte
dbra %d0,super_read | quit if --ctr < 0
clr.l %d1 | return success
rts
user_read:
copyinae:
movs.b (%a0)+,%d1
move.b %d1,(%a1)+ | copy 1 byte
dbra %d0,user_read | quit if --ctr < 0
clr.l %d1 | return success
rts
|
| _060_dmem_read_byte():
|
| Read a data byte from user memory.
|
| INPUTS:
| a0 - user source address
| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
| d0 - data byte in d0
| d1 - 0 = success, !0 = failure
|
.global _060_dmem_read_byte
_060_dmem_read_byte:
clr.l %d0 | clear whole longword
clr.l %d1 | assume success
btst #0x5,0x4(%a6) | check for supervisor state
bnes dmrbs | supervisor
dmrbuae:movs.b (%a0),%d0 | fetch user byte
rts
dmrbs: move.b (%a0),%d0 | fetch super byte
rts
|
| _060_dmem_read_word():
|
| Read a data word from user memory.
|
| INPUTS:
| a0 - user source address
| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
| d0 - data word in d0
| d1 - 0 = success, !0 = failure
|
| _060_imem_read_word():
|
| Read an instruction word from user memory.
|
| INPUTS:
| a0 - user source address
| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
| d0 - instruction word in d0
| d1 - 0 = success, !0 = failure
|
.global _060_dmem_read_word
.global _060_imem_read_word
_060_dmem_read_word:
_060_imem_read_word:
clr.l %d1 | assume success
clr.l %d0 | clear whole longword
btst #0x5,0x4(%a6) | check for supervisor state
bnes dmrws | supervisor
dmrwuae:movs.w (%a0), %d0 | fetch user word
rts
dmrws: move.w (%a0), %d0 | fetch super word
rts
|
| _060_dmem_read_long():
|
|
| INPUTS:
| a0 - user source address
| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
| d0 - data longword in d0
| d1 - 0 = success, !0 = failure
|
| _060_imem_read_long():
|
| Read an instruction longword from user memory.
|
| INPUTS:
| a0 - user source address
| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
| d0 - instruction longword in d0
| d1 - 0 = success, !0 = failure
|
.global _060_dmem_read_long
.global _060_imem_read_long
_060_dmem_read_long:
_060_imem_read_long:
clr.l %d1 | assume success
btst #0x5,0x4(%a6) | check for supervisor state
bnes dmrls | supervisor
dmrluae:movs.l (%a0),%d0 | fetch user longword
rts
dmrls: move.l (%a0),%d0 | fetch super longword
rts
|
| _060_dmem_write_byte():
|
| Write a data byte to user memory.
|
| INPUTS:
| a0 - user destination address
| d0 - data byte in d0
| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
| d1 - 0 = success, !0 = failure
|
.global _060_dmem_write_byte
_060_dmem_write_byte:
clr.l %d1 | assume success
btst #0x5,0x4(%a6) | check for supervisor state
bnes dmwbs | supervisor
dmwbuae:movs.b %d0,(%a0) | store user byte
rts
dmwbs: move.b %d0,(%a0) | store super byte
rts
|
| _060_dmem_write_word():
|
| Write a data word to user memory.
|
| INPUTS:
| a0 - user destination address
| d0 - data word in d0
| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
| d1 - 0 = success, !0 = failure
|
.global _060_dmem_write_word
_060_dmem_write_word:
clr.l %d1 | assume success
btst #0x5,0x4(%a6) | check for supervisor state
bnes dmwws | supervisor
dmwwu:
dmwwuae:movs.w %d0,(%a0) | store user word
bras dmwwr
dmwws: move.w %d0,(%a0) | store super word
dmwwr: clr.l %d1 | return success
rts
|
| _060_dmem_write_long():
|
| Write a data longword to user memory.
|
| INPUTS:
| a0 - user destination address
| d0 - data longword in d0
| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
| d1 - 0 = success, !0 = failure
|
.global _060_dmem_write_long
_060_dmem_write_long:
clr.l %d1 | assume success
btst #0x5,0x4(%a6) | check for supervisor state
bnes dmwls | supervisor
dmwluae:movs.l %d0,(%a0) | store user longword
rts
dmwls: move.l %d0,(%a0) | store super longword
rts
#if 0
|###############################################
|
| Use these routines if your kernel doesn't have _copyout/_copyin equivalents.
| Assumes that D0/D1/A0/A1 are scratch registers. The _copyin/_copyout
| below assume that the SFC/DFC have been set previously.
|
| Linux/68k: These are basically non-inlined versions of
| memcpy_{to,from}fs, but without long-transfer optimization
| Note: Assumed that SFC/DFC are pointing correctly to user data
| space... Should be right, or are there any exceptions?
|
| int _copyout(supervisor_addr, user_addr, nbytes)
|
.global _copyout
_copyout:
move.l 4(%sp),%a0 | source
move.l 8(%sp),%a1 | destination
move.l 12(%sp),%d0 | count
subq.l #1,%d0
moreout:
move.b (%a0)+,%d1 | fetch supervisor byte
copyoutae:
movs.b %d1,(%a1)+ | store user byte
dbra %d0,moreout | are we through yet?
moveq #0,%d0 | return success
rts
|
| int _copyin(user_addr, supervisor_addr, nbytes)
|
.global _copyin
_copyin:
move.l 4(%sp),%a0 | source
move.l 8(%sp),%a1 | destination
move.l 12(%sp),%d0 | count
subq.l #1,%d0
morein:
copyinae:
movs.b (%a0)+,%d1 | fetch user byte
move.b %d1,(%a1)+ | write supervisor byte
dbra %d0,morein | are we through yet?
moveq #0,%d0 | return success
rts
#endif
|###########################################################################
|
| _060_real_trace():
|
| This is the exit point for the 060FPSP when an instruction is being traced
| and there are no other higher priority exceptions pending for this instruction
| or they have already been processed.
|
| The sample code below simply executes an "rte".
|
.global _060_real_trace
_060_real_trace:
bral trap
|
| _060_real_access():
|
| This is the exit point for the 060FPSP when an access error exception
| is encountered. The routine below should point to the operating system
| handler for access error exceptions. The exception stack frame is an
| 8-word access error frame.
|
| The sample routine below simply executes an "rte" instruction which
| is most likely the incorrect thing to do and could put the system
| into an infinite loop.
|
.global _060_real_access
_060_real_access:
bral buserr
| Execption handling for movs access to illegal memory
.section .fixup,#alloc,#execinstr
.even
1: moveq #-1,%d1
rts
.section __ex_table,#alloc
.align 4
.long dmrbuae,1b
.long dmrwuae,1b
.long dmrluae,1b
.long dmwbuae,1b
.long dmwwuae,1b
.long dmwluae,1b
.long copyoutae,1b
.long copyinae,1b
.text
