#
# $OpenBSD: os.s,v 1.2 1996/05/30 22:15:04 niklas Exp $
# $NetBSD: os.s,v 1.2 1996/05/15 19:49:06 is Exp $
#
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
# M68000 Hi-Performance Microprocessor Division
# M68060 Software Package Production Release
#
# M68060 Software Package Copyright (C) 1993, 1994, 1995, 1996 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.
#
#################################
# 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.
#
#
# _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:
btst &0x5,0x4(%a6) # check for supervisor state
beq.b user_write
super_write:
mov.b (%a0)+,(%a1)+ # copy 1 byte
subq.l &0x1,%d0 # decr byte counter
bne.b super_write # quit if ctr = 0
clr.l %d1 # return success
rts
user_write:
mov.l %d0,-(%sp) # pass: counter
mov.l %a1,-(%sp) # pass: user dst
mov.l %a0,-(%sp) # pass: supervisor src
bsr.l _copyout # write byte to user mem
mov.l %d0,%d1 # return success
add.l &0xc, %sp # clear 3 lw params
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:
btst &0x5,0x4(%a6) # check for supervisor state
beq.b user_read
super_read:
mov.b (%a0)+,(%a1)+ # copy 1 byte
subq.l &0x1,%d0 # decr byte counter
bne.b super_read # quit if ctr = 0
clr.l %d1 # return success
rts
user_read:
mov.l %d0,-(%sp) # pass: counter
mov.l %a1,-(%sp) # pass: super dst
mov.l %a0,-(%sp) # pass: user src
bsr.l _copyin # read byte from user mem
mov.l %d0,%d1 # return success
add.l &0xc,%sp # clear 3 lw params
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:
btst &0x5,0x4(%a6) # check for supervisor state
bne.b dmrbs # supervisor
dmrbu: clr.l -(%sp) # clear space on stack for result
mov.l &0x1,-(%sp) # pass: # bytes to copy
pea 0x7(%sp) # pass: dst addr (stack)
mov.l %a0,-(%sp) # pass: src addr (user mem)
bsr.l _copyin # "copy in" the data
mov.l %d0,%d1 # return success
add.l &0xc,%sp # delete params
mov.l (%sp)+,%d0 # put answer in d0
rts
dmrbs: clr.l %d0 # clear whole longword
mov.b (%a0),%d0 # fetch super byte
clr.l %d1 # return success
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
#
global _060_dmem_read_word
_060_dmem_read_word:
btst &0x5,0x4(%a6) # check for supervisor state
bne.b dmrws # supervisor
dmrwu: clr.l -(%sp) # clear space on stack for result
mov.l &0x2,-(%sp) # pass: # bytes to copy
pea 0x6(%sp) # pass: dst addr (stack)
mov.l %a0,-(%sp) # pass: src addr (user mem)
bsr.l _copyin # "copy in" the data
mov.l %d0,%d1 # return success
add.l &0xc,%sp # delete params
mov.l (%sp)+,%d0 # put answer in d0
rts
dmrws: clr.l %d0 # clear whole longword
mov.w (%a0), %d0 # fetch super word
clr.l %d1 # return success
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
#
global _060_dmem_read_long
_060_dmem_read_long:
btst &0x5,0x4(%a6) # check for supervisor state
bne.b dmrls # supervisor
dmrlu: subq.l &0x4,%sp # clear space on stack for result
mov.l &0x4,-(%sp) # pass: # bytes to copy
pea 0x4(%sp) # pass: dst addr (stack)
mov.l %a0,-(%sp) # pass: src addr (user mem)
bsr.l _copyin # "copy in" the data
mov.l %d0,%d1 # return success
add.l &0xc,%sp # delete params
mov.l (%sp)+,%d0 # put answer in d0
rts
dmrls: mov.l (%a0),%d0 # fetch super longword
clr.l %d1 # return success
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:
btst &0x5,0x4(%a6) # check for supervisor state
bne.b dmwbs # supervisor
dmwbu: mov.l %d0,-(%sp) # put src on stack
mov.l &0x1,-(%sp) # pass: # bytes to copy
mov.l %a0,-(%sp) # pass: dst addr (user mem)
pea 0xb(%sp) # pass: src addr (stack)
bsr.l _copyout # "copy out" the data
mov.l %d0,%d1 # return success
add.l &0x10,%sp # delete params + src
rts
dmwbs: mov.b %d0,(%a0) # store super byte
clr.l %d1 # return success
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:
btst &0x5,0x4(%a6) # check for supervisor state
bne.b dmwws # supervisor
dmwwu: mov.l %d0,-(%sp) # put src on stack
mov.l &0x2,-(%sp) # pass: # bytes to copy
mov.l %a0,-(%sp) # pass: dst addr (user mem)
pea 0xa(%sp) # pass: src addr (stack)
bsr.l _copyout # "copy out" the data
mov.l %d0,%d1 # return success
add.l &0x10,%sp # delete params + src
rts
dmwws: mov.w %d0,(%a0) # store super word
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:
btst &0x5,0x4(%a6) # check for supervisor state
bne.b dmwls # supervisor
dmwlu: mov.l %d0,-(%sp) # put src on stack
mov.l &0x4,-(%sp) # pass: # bytes to copy
mov.l %a0,-(%sp) # pass: dst addr (user mem)
pea 0x8(%sp) # pass: src addr (stack)
bsr.l _copyout # "copy out" the data
mov.l %d0,%d1 # return success
add.l &0x10,%sp # delete params + src
rts
dmwls: mov.l %d0,(%a0) # store super longword
clr.l %d1 # return success
rts
#
# _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_imem_read_word
_060_imem_read_word:
btst &0x5,0x4(%a6) # check for supervisor state
bne.b imrws # supervisor
imrwu: clr.l -(%sp) # clear space on stack for result
mov.l &0x2,-(%sp) # pass: # bytes to copy
pea 0x6(%sp) # pass: dst addr (stack)
mov.l %a0,-(%sp) # pass: src addr (user mem)
bsr.l _copyin # "copy in" the data
mov.l %d0,%d1 # return success
add.l &0xc,%sp # delete params
mov.l (%sp)+,%d0 # put answer in d0
rts
imrws: mov.w (%a0),%d0 # fetch super word
clr.l %d1 # return success
rts
#
# _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_imem_read_long
_060_imem_read_long:
btst &0x5,0x4(%a6) # check for supervisor state
bne.b imrls # supervisor
imrlu: subq.l &0x4,%sp # clear space on stack for result
mov.l &0x4,-(%sp) # pass: # bytes to copy
pea 0x4(%sp) # pass: dst addr (stack)
mov.l %a0,-(%sp) # pass: src addr (user mem)
bsr.l _copyin # "copy in" the data
mov.l %d0,%d1 # return success
add.l &0xc,%sp # delete params
mov.l (%sp)+,%d0 # put answer in d0
rts
imrls: mov.l (%a0),%d0 # fetch super longword
clr.l %d1 # return success
rts
################################################
#
# 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.
#
#
# int _copyout(supervisor_addr, user_addr, nbytes)
#
global _copyout
_copyout:
mov.l 4(%sp),%a0 # source
mov.l 8(%sp),%a1 # destination
mov.l 12(%sp),%d0 # count
moreout:
mov.b (%a0)+,%d1 # fetch supervisor byte
movs.b %d1,(%a1)+ # store user byte
subq.l &0x1,%d0 # are we through yet?
bne.w moreout # no; so, continue
rts
#
# int _copyin(user_addr, supervisor_addr, nbytes)
#
global _copyin
_copyin:
mov.l 4(%sp),%a0 # source
mov.l 8(%sp),%a1 # destination
mov.l 12(%sp),%d0 # count
morein:
movs.b (%a0)+,%d1 # fetch user byte
mov.b %d1,(%a1)+ # write supervisor byte
subq.l &0x1,%d0 # are we through yet?
bne.w morein # no; so, continue
rts
############################################################################
#
# _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:
rte
#
# _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:
rte
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