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nubus: move nubus to its own 32-bit address space

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According to "Designing Cards and Drivers for the Macintosh Family" the Nubus
has its own 32-bit address space based upon physical slot addressing.

Move Nubus to its own 32-bit address space and then use memory region aliases
to map available slot and super slot ranges into the q800 system address
space via the Macintosh Nubus bridge.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210924073808.1041-13-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Mark Cave-Ayland 2021-09-24 08:38:00 +01:00 • committed by Laurent Vivier
parent 3616f424c9
commit 62437f90cf
5 changed files with 44 additions and 7 deletions
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16
hw/nubus/mac-nubus-bridge.c
View file

@ -22,8 +22,20 @@ static void mac_nubus_bridge_init(Object *obj)
s->bus->slot_available_mask = MAKE_64BIT_MASK(MAC_NUBUS_FIRST_SLOT,
MAC_NUBUS_SLOT_NB);
sysbus_init_mmio(sbd, &s->bus->super_slot_io);
sysbus_init_mmio(sbd, &s->bus->slot_io);
/* Aliases for slots 0x9 to 0xe */
memory_region_init_alias(&s->super_slot_alias, obj, "super-slot-alias",
&s->bus->nubus_mr,
MAC_NUBUS_FIRST_SLOT * NUBUS_SUPER_SLOT_SIZE,
MAC_NUBUS_SLOT_NB * NUBUS_SUPER_SLOT_SIZE);
memory_region_init_alias(&s->slot_alias, obj, "slot-alias",
&s->bus->nubus_mr,
NUBUS_SLOT_BASE +
MAC_NUBUS_FIRST_SLOT * NUBUS_SLOT_SIZE,
MAC_NUBUS_SLOT_NB * NUBUS_SLOT_SIZE);
sysbus_init_mmio(sbd, &s->super_slot_alias);
sysbus_init_mmio(sbd, &s->slot_alias);
}
static void mac_nubus_bridge_class_init(ObjectClass *klass, void *data)