dev: add functions to create device objects

Makefile

@@ -20,7 +20,7 @@ include arch/$(SOCKS_ARCH)/config.mk
 # Platform-independent kernel source files
 ####################################
 
-KERNEL_SRC_DIRS := init kernel vm ds util obj sched test
+KERNEL_SRC_DIRS := init kernel vm ds util obj sched dev test
 KERNEL_C_FILES := $(foreach dir,$(KERNEL_SRC_DIRS),$(wildcard $(dir)/*.c))
 KERNEL_CXX_FILES := $(foreach dir,$(KERNEL_SRC_DIRS),$(wildcard $(dir)/*.cpp))
 KERNEL_OBJ := $(addprefix $(BUILD_DIR)/,$(KERNEL_C_FILES:.c=.o) $(KERNEL_CXX_FILES:.cpp=.o))

dev/block.c

@@ -0,0 +1,12 @@
+#include <socks/device.h>
+
+struct block_device *block_device_create(void)
+{
+	struct device *dev = device_alloc();
+	if (!dev) {
+		return NULL;
+	}
+
+	dev->dev_type = DEV_TYPE_BLOCK;
+	return BLOCK_DEVICE(dev);
+}

dev/bus.c

@@ -0,0 +1,12 @@
+#include <socks/device.h>
+
+struct bus_device *bus_device_create(void)
+{
+	struct device *dev = device_alloc();
+	if (!dev) {
+		return NULL;
+	}
+
+	dev->dev_type = DEV_TYPE_BUS;
+	return BUS_DEVICE(dev);
+}

dev/char.c

@@ -0,0 +1,12 @@
+#include <socks/device.h>
+
+struct char_device *char_device_create(void)
+{
+	struct device *dev = device_alloc();
+	if (!dev) {
+		return NULL;
+	}
+
+	dev->dev_type = DEV_TYPE_CHAR;
+	return CHAR_DEVICE(dev);
+}

dev/core.c

@@ -0,0 +1,40 @@
+#include <socks/status.h>
+#include <socks/object.h>
+#include <socks/device.h>
+
+static struct device *root_device = NULL;
+static object_type_t device_type = {
+	.ob_name = "device",
+	.ob_size = sizeof(struct device),
+	.ob_ops = {
+		.destroy = NULL,
+	}
+};
+
+kern_status_t device_init(void)
+{
+	object_type_register(&device_type);
+	return KERN_OK;
+}
+
+kern_status_t set_root_device(struct device *dev)
+{
+	if (root_device) {
+	    object_deref(object_header(root_device));
+	}
+
+	object_ref(object_header(dev));
+	root_device = dev;
+
+	return KERN_OK;
+}
+
+struct device *device_alloc(void)
+{
+	object_t *dev_object = object_create(&device_type);
+	if (!dev_object) {
+		return NULL;
+	}
+	
+	return object_data(dev_object);
+}

dev/input.c

@@ -0,0 +1,12 @@
+#include <socks/device.h>
+
+struct input_device *input_device_create(void)
+{
+	struct device *dev = device_alloc();
+	if (!dev) {
+		return NULL;
+	}
+
+	dev->dev_type = DEV_TYPE_INPUT;
+	return INPUT_DEVICE(dev);
+}

dev/net.c

@@ -0,0 +1,12 @@
+#include <socks/device.h>
+
+struct net_device *net_device_create(void)
+{
+	struct device *dev = device_alloc();
+	if (!dev) {
+		return NULL;
+	}
+
+	dev->dev_type = DEV_TYPE_NET;
+	return NET_DEVICE(dev);
+}

include/socks/device.h

@@ -10,12 +10,14 @@ struct device;
 #define CHAR_DEVICE(dev) ((dev)->dev_type == DEV_TYPE_CHAR ? &(dev)->chr : NULL);
 #define NET_DEVICE(dev) ((dev)->dev_type == DEV_TYPE_NET ? &(dev)->net : NULL);
 #define INPUT_DEVICE(dev) ((dev)->dev_type == DEV_TYPE_INPUT ? &(dev)->input : NULL);
+#define BUS_DEVICE(dev) ((dev)->dev_type == DEV_TYPE_BUS ? &(dev)->bus : NULL);
 
 enum device_type {
 	DEV_TYPE_BLOCK,
 	DEV_TYPE_CHAR,
 	DEV_TYPE_NET,
 	DEV_TYPE_INPUT,
+	DEV_TYPE_BUS,
 };
 
 struct block_device_ops {
@@ -84,6 +86,8 @@ struct device {
 extern kern_status_t device_init(void);
 extern kern_status_t set_root_device(struct device *dev);
 
+extern struct device *device_alloc(void);
+
 extern struct char_device *char_device_create(void);
 extern struct block_device *block_device_create(void);
 extern struct net_device *net_device_create(void);