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q800: add machine id register 

MacOS reads this address to identify the hardware.

This is a basic implementation returning the ID of Quadra 800.

Details:

  http://mess.redump.net/mess/driver_info/mac_technical_notes

"There are 3 ID schemes [...]
 The third and most scalable is a machine ID register at 0x5ffffffc.
 The top word must be 0xa55a to be valid. Then bits 15-11 are 0 for
 consumer Macs, 1 for portables, 2 for high-end 68k, and 3 for high-end
 PowerPC. Bit 10 is 1 if additional ID bits appear elsewhere (e.g. in VIA1).
 The rest of the bits are a per-model identifier.

 Model                          Lower 16 bits of ID
...
 Quadra/Centris 610/650/800     0x2BAD"

Co-developed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231004083806.757242-4-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 09:37:49 +01:00 committed by Laurent Vivier
parent e2fd695e9d
commit e993af36a7
2 changed files with 30 additions and 0 deletions
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29
hw/m68k/q800.c
View File

@ -91,6 +91,9 @@
#define Q800_NUBUS_SLOTS_AVAILABLE (BIT(0x9) | BIT(0xc) | BIT(0xd) | \
BIT(0xe))
/* Quadra 800 machine ID */
#define Q800_MACHINE_ID 0xa55a2bad
static void main_cpu_reset(void *opaque)
{
@ -192,6 +195,27 @@ static const MemoryRegionOps macio_alias_ops = {
},
};
static uint64_t machine_id_read(void *opaque, hwaddr addr, unsigned size)
{
return Q800_MACHINE_ID;
}
static void machine_id_write(void *opaque, hwaddr addr, uint64_t val,
unsigned size)
{
return;
}
static const MemoryRegionOps machine_id_ops = {
.read = machine_id_read,
.write = machine_id_write,
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
};
static void q800_machine_init(MachineState *machine)
{
Q800MachineState *m = Q800_MACHINE(machine);
@ -253,6 +277,11 @@ static void q800_machine_init(MachineState *machine)
memory_region_add_subregion(get_system_memory(), IO_BASE + IO_SLICE,
&m->macio_alias);
memory_region_init_io(&m->machine_id, NULL, &machine_id_ops, NULL,
"Machine ID", 4);
memory_region_add_subregion(get_system_memory(), 0x5ffffffc,
&m->machine_id);
/* IRQ Glue */
object_initialize_child(OBJECT(machine), "glue", &m->glue, TYPE_GLUE);
object_property_set_link(OBJECT(&m->glue), "cpu", OBJECT(&m->cpu),

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

@ -60,6 +60,7 @@ struct Q800MachineState {
DJMEMCState djmemc;
MemoryRegion macio;
MemoryRegion macio_alias;
MemoryRegion machine_id;
};
#define TYPE_Q800_MACHINE MACHINE_TYPE_NAME("q800")