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q800: allow accesses to RAM area even if less memory is available

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MacOS attempts a series of writes and reads over the entire RAM area in order
to determine the amount of RAM within the machine. Allow accesses to the
entire RAM area ignoring writes and always reading zero for areas where there
is no physical RAM installed to allow MacOS to detect the memory size without
faulting.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-ID: <20231004083806.757242-7-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Mark Cave-Ayland 2023-10-04 09:37:52 +01:00 • committed by Laurent Vivier
parent bdc2c77d29
commit 6997f26d0d
2 changed files with 30 additions and 1 deletions
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1
include/hw/m68k/q800.h
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@ -60,6 +60,7 @@ struct Q800MachineState {
MacfbNubusState macfb;
DJMEMCState djmemc;
IOSBState iosb;
MemoryRegion ramio;
MemoryRegion macio;
MemoryRegion macio_alias;
MemoryRegion machine_id;