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q800: add alias for MacOS toolbox ROM at 0x40000000 

According to the Apple Quadra 800 Developer Note document, the Quadra 800 ROM
consists of 2 ROM code sections based at offsets 0x0 and 0x800000. A/UX attempts
to access the toolbox ROM at the lower offset during startup, so provide a
memory alias to allow the access to succeed.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-ID: <20231004083806.757242-20-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 09:38:05 +01:00 committed by Laurent Vivier
parent 7685fc2a18
commit 9d35c6ade5
2 changed files with 6 additions and 0 deletions
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5
hw/m68k/q800.c
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@ -660,6 +660,11 @@ static void q800_machine_init(MachineState *machine)
filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
memory_region_add_subregion(get_system_memory(), MACROM_ADDR, &m->rom);
memory_region_init_alias(&m->rom_alias, NULL, "m68k_mac.rom-alias",
&m->rom, 0, MACROM_SIZE);
memory_region_add_subregion(get_system_memory(), 0x40000000,
&m->rom_alias);
/* Load MacROM binary */
if (filename) {
bios_size = load_image_targphys(filename, MACROM_ADDR, MACROM_SIZE);

1
include/hw/m68k/q800.h
View File

@ -50,6 +50,7 @@ struct Q800MachineState {
bool easc;
M68kCPU cpu;
MemoryRegion rom;
MemoryRegion rom_alias;
GLUEState glue;
MOS6522Q800VIA1State via1;
MOS6522Q800VIA2State via2;