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For Darwin, the default addressing mode is memory banks.

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When the host OS is Mac OS X, direct addressing in BII doesn't guarantee
that the allocated memory for frame buffer base address in the host
(FrameBaseHost) satisfies the following conditions:

- FrameBaseHost > RamBaseHost
- (FrameBaseHost - RamBaseHost) + Frame_Size < 4GiB
where RamBaseHost refers to the emulated RAM base address in the host.

This may cause the random hang problem where the allocated frame address
failed to meet the conditions above.

Because the direct addressing mapping is a simple math:

RamAddrMac = RamAddrHost - RamBaseHost.

See details: https://github.com/cebix/macemu/issues/203

Signed-off-by: Ricky Zhang <rickyzhang@gmail.com>
This commit is contained in:
Ricky Zhang 2020-06-30 17:55:05 -04:00
parent 16081b2878
commit 56665d30a3
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5
BasiliskII/src/Unix/configure.ac
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@ -1428,6 +1428,11 @@ fi
AC_TRANSLATE_DEFINE(HAVE_LINKER_SCRIPT, "$ac_cv_linker_script_works",
[Define if there is a linker script to relocate the executable above 0x70000000.])
dnl override the addressing mode test order for Darwin
if [[ "x$OS_TYPE" = "xdarwin" ]]; then
ADDRESSING_TEST_ORDER="banks"
fi
dnl Determine the addressing mode to use
if [[ "x$WANT_NATIVE_M68K" = "xyes" ]]; then
ADDRESSING_MODE="real"