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q800: reimplement mac-io region aliasing using IO memory region

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The current use of aliased memory regions causes us 2 problems: firstly the
output of "info qom-tree" is absolutely huge and difficult to read, and
secondly we have already reached the internal limit for memory regions as
adding any new memory region into the mac-io region causes QEMU to assert
with "phys_section_add: Assertion `map->sections_nb < TARGET_PAGE_SIZE'
failed".

Implement the mac-io region aliasing using a single IO memory region that
applies IO_SLICE_MASK representing the maximum size of the aliased region and
then forwarding the access to the existing mac-io memory region using the
address space API.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20230621085353.113233-12-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Mark Cave-Ayland 2023-06-21 09:53:40 +01:00 • committed by Laurent Vivier
parent 7527c52fd0
commit f18a288632
2 changed files with 82 additions and 19 deletions
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1
include/hw/m68k/q800.h
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@ -40,6 +40,7 @@ struct Q800MachineState {
MemoryRegion rom;
GLUEState glue;
MemoryRegion macio;
MemoryRegion macio_alias;
};
#define TYPE_Q800_MACHINE MACHINE_TYPE_NAME("q800")