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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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6
include/hw/nubus/nubus.h
View file

@ -17,6 +17,9 @@
#define NUBUS_SUPER_SLOT_SIZE 0x10000000U
#define NUBUS_SUPER_SLOT_NB 0xe
#define NUBUS_SLOT_BASE (NUBUS_SUPER_SLOT_SIZE * \
(NUBUS_SUPER_SLOT_NB + 1))
#define NUBUS_SLOT_SIZE 0x01000000
#define NUBUS_FIRST_SLOT 0x0
#define NUBUS_LAST_SLOT 0xf
@ -33,6 +36,9 @@ OBJECT_DECLARE_SIMPLE_TYPE(NubusBus, NUBUS_BUS)
struct NubusBus {
BusState qbus;
AddressSpace nubus_as;
MemoryRegion nubus_mr;
MemoryRegion super_slot_io;
MemoryRegion slot_io;