This device can be used to create a memory wrapped into a
sysbus device.
This device has one property 'readonly' which allows
to choose between a ram or a rom.
The purpose for this device is to be used with qapi command
device_add.
Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
---
include/hw/mem/sysbus-memory.h | 28 ++++++++++++
hw/mem/sysbus-memory.c | 80 ++++++++++++++++++++++++++++++++++
hw/mem/meson.build | 2 +
3 files changed, 110 insertions(+)
create mode 100644 include/hw/mem/sysbus-memory.h
create mode 100644 hw/mem/sysbus-memory.c
diff --git a/include/hw/mem/sysbus-memory.h b/include/hw/mem/sysbus-memory.h
new file mode 100644
index 0000000000..5c596f8b4f
--- /dev/null
+++ b/include/hw/mem/sysbus-memory.h
@@ -0,0 +1,28 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * SysBusDevice Memory
+ *
+ * Copyright (c) 2021 Greensocs
+ */
+
+#ifndef HW_SYSBUS_MEMORY_H
+#define HW_SYSBUS_MEMORY_H
+
+#include "hw/sysbus.h"
+#include "qom/object.h"
+
+#define TYPE_SYSBUS_MEMORY "sysbus-memory"
+OBJECT_DECLARE_SIMPLE_TYPE(SysBusMemoryState, SYSBUS_MEMORY)
+
+struct SysBusMemoryState {
+ /* <private> */
+ SysBusDevice parent_obj;
+ uint64_t size;
+ bool readonly;
+
+ /* <public> */
+ MemoryRegion mem;
+};
+
+#endif /* HW_SYSBUS_MEMORY_H */
diff --git a/hw/mem/sysbus-memory.c b/hw/mem/sysbus-memory.c
new file mode 100644
index 0000000000..f1ad7ba7ec
--- /dev/null
+++ b/hw/mem/sysbus-memory.c
@@ -0,0 +1,80 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * SysBusDevice Memory
+ *
+ * Copyright (c) 2021 Greensocs
+ */
+
+#include "qemu/osdep.h"
+#include "hw/mem/sysbus-memory.h"
+#include "hw/qdev-properties.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "qapi/error.h"
+
+static Property sysbus_memory_properties[] = {
+ DEFINE_PROP_UINT64("size", SysBusMemoryState, size, 0),
+ DEFINE_PROP_BOOL("readonly", SysBusMemoryState, readonly, false),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void sysbus_memory_realize(DeviceState *dev, Error **errp)
+{
+ SysBusMemoryState *s = SYSBUS_MEMORY(dev);
+ gchar *name;
+
+ if (!s->size) {
+ error_setg(errp, "'size' must be non-zero.");
+ return;
+ }
+
+ /*
+ * We impose having an id (which is unique) because we need to generate
+ * a unique name for the memory region.
+ * memory_region_init_ram/rom() will abort() (in qemu_ram_set_idstr()
+ * function if 2 system-memory devices are created with the same name
+ * for the memory region).
+ */
+ if (!dev->id) {
+ error_setg(errp, "system-memory device must have an id.");
+ return;
+ }
+ name = g_strdup_printf("%s.region", dev->id);
+
+ if (s->readonly) {
+ memory_region_init_rom(&s->mem, OBJECT(dev), name, s->size, errp);
+ } else {
+ memory_region_init_ram(&s->mem, OBJECT(dev), name, s->size, errp);
+ }
+
+ g_free(name);
+ if (*errp) {
+ return;
+ }
+
+ sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->mem);
+}
+
+static void sysbus_memory_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->user_creatable = true;
+ dc->realize = sysbus_memory_realize;
+ device_class_set_props(dc, sysbus_memory_properties);
+}
+
+static const TypeInfo sysbus_memory_info = {
+ .name = TYPE_SYSBUS_MEMORY,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(SysBusMemoryState),
+ .class_init = sysbus_memory_class_init,
+};
+
+static void sysbus_memory_register_types(void)
+{
+ type_register_static(&sysbus_memory_info);
+}
+
+type_init(sysbus_memory_register_types)
diff --git a/hw/mem/meson.build b/hw/mem/meson.build
index 82f86d117e..04c74e12f2 100644
--- a/hw/mem/meson.build
+++ b/hw/mem/meson.build
@@ -7,3 +7,5 @@ mem_ss.add(when: 'CONFIG_NVDIMM', if_true: files('nvdimm.c'))
softmmu_ss.add_all(when: 'CONFIG_MEM_DEVICE', if_true: mem_ss)
softmmu_ss.add(when: 'CONFIG_SPARSE_MEM', if_true: files('sparse-mem.c'))
+
+softmmu_ss.add(files('sysbus-memory.c'))
--
2.35.1