| 558 |
|
|
| 559 |
|
fi dnl HAVE_MMAP_VM |
| 560 |
|
|
| 561 |
+ |
dnl Check if we can modify the __PAGEZERO segment for use as Low Memory |
| 562 |
+ |
AC_CACHE_CHECK([whether __PAGEZERO can be Low Memory area 0x0000-0x2000], |
| 563 |
+ |
ac_cv_pagezero_hack, [ |
| 564 |
+ |
ac_cv_pagezero_hack=no |
| 565 |
+ |
if AC_TRY_COMMAND([Darwin/testlmem.sh 0x2000]); then |
| 566 |
+ |
ac_cv_pagezero_hack=yes |
| 567 |
+ |
dnl might as well skip the test for mmap-able low memory |
| 568 |
+ |
ac_cv_can_map_lm=no |
| 569 |
+ |
fi |
| 570 |
+ |
]) |
| 571 |
+ |
AC_TRANSLATE_DEFINE(PAGEZERO_HACK, "$ac_cv_pagezero_hack", |
| 572 |
+ |
[Define if the __PAGEZERO Mach-O Low Memory Globals hack works on this system.]) |
| 573 |
+ |
|
| 574 |
|
dnl Check if we can mmap 0x2000 bytes from 0x0000 |
| 575 |
|
AC_CACHE_CHECK([whether we can map Low Memory area 0x0000-0x2000], |
| 576 |
|
ac_cv_can_map_lm, [ |
| 756 |
|
CAN_VOSF=yes |
| 757 |
|
fi |
| 758 |
|
|
| 759 |
+ |
dnl A dummy program that returns always true |
| 760 |
+ |
BLESS=/bin/true |
| 761 |
+ |
|
| 762 |
|
dnl Determine the addressing mode to use |
| 763 |
|
if [[ "x$WANT_NATIVE_M68K" = "xyes" ]]; then |
| 764 |
|
ADDRESSING_MODE="real" |
| 769 |
|
case $am in |
| 770 |
|
real) |
| 771 |
|
dnl Requires ability to mmap() Low Memory globals |
| 772 |
< |
if [[ "x$ac_cv_can_map_lm" = "xno" ]]; then |
| 772 |
> |
if [[ "x$ac_cv_can_map_lm$ac_cv_pagezero_hack" = "xnono" ]]; then |
| 773 |
|
continue |
| 774 |
|
fi |
| 775 |
< |
dnl Requires VOSF screen updates |
| 775 |
> |
dnl Requires VOSF screen updates |
| 776 |
|
if [[ "x$CAN_VOSF" = "xno" ]]; then |
| 777 |
|
continue |
| 778 |
|
fi |
| 780 |
|
ADDRESSING_MODE="real" |
| 781 |
|
WANT_VOSF=yes dnl we can use VOSF and we need it actually |
| 782 |
|
DEFINES="$DEFINES -DREAL_ADDRESSING" |
| 783 |
+ |
if [[ "x$ac_cv_pagezero_hack" = "xyes" ]]; then |
| 784 |
+ |
BLESS=Darwin/lowmem |
| 785 |
+ |
LDFLAGS="$LDFLAGS -pagezero_size 0x2000" |
| 786 |
+ |
fi |
| 787 |
|
break |
| 788 |
|
;; |
| 789 |
|
direct) |
| 1172 |
|
AC_SUBST(SYSSRCS) |
| 1173 |
|
AC_SUBST(CPUINCLUDES) |
| 1174 |
|
AC_SUBST(CPUSRCS) |
| 1175 |
+ |
AC_SUBST(BLESS) |
| 1176 |
|
AC_CONFIG_FILES([Makefile]) |
| 1177 |
|
AC_OUTPUT |
| 1178 |
|
|
