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[PATCH 3/3] q800: add machine id register
From: |
Laurent Vivier |
Subject: |
[PATCH 3/3] q800: add machine id register |
Date: |
Thu, 12 Dec 2019 21:01:42 +0100 |
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"
Signed-off-by: Laurent Vivier <address@hidden>
---
hw/m68k/q800.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/hw/m68k/q800.c b/hw/m68k/q800.c
index 9ee0cb1141..c2b2aa779f 100644
--- a/hw/m68k/q800.c
+++ b/hw/m68k/q800.c
@@ -97,6 +97,23 @@ static void main_cpu_reset(void *opaque)
cpu->env.pc = ldl_phys(cs->as, 4);
}
+static uint64_t machine_id_read(void *opaque, hwaddr addr, unsigned size)
+{
+ return 0xa55a2bad; /* Quadra 800 ID */
+}
+
+static void machine_id_write(void *opaque, hwaddr addr, uint64_t val,
+ unsigned size)
+{
+}
+
+static const MemoryRegionOps machine_id_ops = {
+ .read = machine_id_read,
+ .write = machine_id_write,
+ .valid.min_access_size = 4,
+ .valid.max_access_size = 4,
+};
+
static void q800_init(MachineState *machine)
{
M68kCPU *cpu = NULL;
@@ -110,6 +127,7 @@ static void q800_init(MachineState *machine)
MemoryRegion *rom;
MemoryRegion *ram;
MemoryRegion *io;
+ MemoryRegion *machine_id;
const int io_slice_nb = (IO_SIZE / IO_SLICE) - 1;
int i;
ram_addr_t ram_size = machine->ram_size;
@@ -159,6 +177,10 @@ static void q800_init(MachineState *machine)
g_free(name);
}
+ machine_id = g_malloc(sizeof(*machine_id));
+ memory_region_init_io(machine_id, NULL, &machine_id_ops, NULL, "Machine
ID", 4);
+ memory_region_add_subregion(get_system_memory(), 0x5ffffffc, machine_id);
+
/* djMEMC memory and interrupt controller */
djmemc_dev = qdev_create(NULL, TYPE_DJMEMC);
--
2.23.0