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nubus: use bitmap to manage available slots 

Convert nubus_device_realize() to use a bitmap to manage available slots to allow
for future Nubus devices to be plugged into arbitrary slots from the command line
using a new qdev "slot" parameter for nubus devices.

Update mac_nubus_bridge_init() to only allow slots 0x9 to 0xe on Macintosh machines
as documented in "Designing Cards and Drivers for the Macintosh Family".

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210924073808.1041-5-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 08:37:52 +01:00 committed by Laurent Vivier
parent 90be1dea50
commit 03deab9940
5 changed files with 41 additions and 14 deletions
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4
hw/nubus/mac-nubus-bridge.c
View File

@ -18,6 +18,10 @@ static void mac_nubus_bridge_init(Object *obj)
s->bus = NUBUS_BUS(qbus_create(TYPE_NUBUS_BUS, DEVICE(s), NULL));
/* Macintosh only has slots 0x9 to 0xe available */
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);
}

5
hw/nubus/nubus-bus.c
View File

@ -86,13 +86,14 @@ static void nubus_init(Object *obj)
memory_region_init_io(&nubus->super_slot_io, obj, &nubus_super_slot_ops,
nubus, "nubus-super-slots",
NUBUS_SUPER_SLOT_NB * NUBUS_SUPER_SLOT_SIZE);
(NUBUS_SUPER_SLOT_NB + 1) * NUBUS_SUPER_SLOT_SIZE);
memory_region_init_io(&nubus->slot_io, obj, &nubus_slot_ops,
nubus, "nubus-slots",
NUBUS_SLOT_NB * NUBUS_SLOT_SIZE);
nubus->current_slot = NUBUS_FIRST_SLOT;
nubus->slot_available_mask = MAKE_64BIT_MASK(NUBUS_FIRST_SLOT,
NUBUS_SLOT_NB);
}
static void nubus_class_init(ObjectClass *oc, void *data)

29
hw/nubus/nubus-device.c
View File

@ -161,13 +161,26 @@ static void nubus_device_realize(DeviceState *dev, Error **errp)
char *name;
hwaddr slot_offset;
if (nubus->current_slot < NUBUS_FIRST_SLOT ||
nubus->current_slot > NUBUS_LAST_SLOT) {
error_setg(errp, "Cannot register nubus card, not enough slots");
return;
if (nd->slot == -1) {
/* No slot specified, find first available free slot */
int s = ctz32(nubus->slot_available_mask);
if (s != 32) {
nd->slot = s;
} else {
error_setg(errp, "Cannot register nubus card, no free slot "
"available");
return;
}
} else {
/* Slot specified, make sure the slot is available */
if (!(nubus->slot_available_mask & BIT(nd->slot))) {
error_setg(errp, "Cannot register nubus card, slot %d is "
"unavailable or already occupied", nd->slot);
return;
}
}
nd->slot = nubus->current_slot++;
nubus->slot_available_mask &= ~BIT(nd->slot);
/* Super */
slot_offset = nd->slot * NUBUS_SUPER_SLOT_SIZE;
@ -191,12 +204,18 @@ static void nubus_device_realize(DeviceState *dev, Error **errp)
nubus_register_format_block(nd);
}
static Property nubus_device_properties[] = {
DEFINE_PROP_INT32("slot", NubusDevice, slot, -1),
DEFINE_PROP_END_OF_LIST()
};
static void nubus_device_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->realize = nubus_device_realize;
dc->bus_type = TYPE_NUBUS_BUS;
device_class_set_props(dc, nubus_device_properties);
}
static const TypeInfo nubus_device_type_info = {

4
include/hw/nubus/mac-nubus-bridge.h
View File

@ -12,6 +12,10 @@
#include "hw/nubus/nubus.h"
#include "qom/object.h"
#define MAC_NUBUS_FIRST_SLOT 0x9
#define MAC_NUBUS_LAST_SLOT 0xe
#define MAC_NUBUS_SLOT_NB (MAC_NUBUS_LAST_SLOT - MAC_NUBUS_FIRST_SLOT + 1)
#define TYPE_MAC_NUBUS_BRIDGE "mac-nubus-bridge"
OBJECT_DECLARE_SIMPLE_TYPE(MacNubusState, MAC_NUBUS_BRIDGE)

13
include/hw/nubus/nubus.h
View File

@ -14,13 +14,12 @@
#include "qom/object.h"
#define NUBUS_SUPER_SLOT_SIZE 0x10000000U
#define NUBUS_SUPER_SLOT_NB 0x9
#define NUBUS_SUPER_SLOT_NB 0xe
#define NUBUS_SLOT_SIZE 0x01000000
#define NUBUS_SLOT_NB 0xF
#define NUBUS_FIRST_SLOT 0x9
#define NUBUS_LAST_SLOT 0xF
#define NUBUS_FIRST_SLOT 0x0
#define NUBUS_LAST_SLOT 0xf
#define NUBUS_SLOT_NB (NUBUS_LAST_SLOT - NUBUS_FIRST_SLOT + 1)
#define TYPE_NUBUS_DEVICE "nubus-device"
OBJECT_DECLARE_SIMPLE_TYPE(NubusDevice, NUBUS_DEVICE)
@ -36,13 +35,13 @@ struct NubusBus {
MemoryRegion super_slot_io;
MemoryRegion slot_io;
int current_slot;
uint16_t slot_available_mask;
};
struct NubusDevice {
DeviceState qdev;
int slot;
int32_t slot;
MemoryRegion super_slot_mem;
MemoryRegion slot_mem;