device.h

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#ifndef _GPXE_DEVICE_H
#define _GPXE_DEVICE_H

/**
 * @file
 *
 * Device model
 *
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <gpxe/list.h>
#include <gpxe/tables.h>

/** A hardware device description */
struct device_description {
        /** Bus type
         *
         * This must be a BUS_TYPE_XXX constant.
         */
        unsigned int bus_type;
        /** Location
         *
         * The interpretation of this field is bus-type-specific.
         */
        unsigned int location;
        /** Vendor ID */
        unsigned int vendor;
        /** Device ID */
        unsigned int device;
        /** Device class */
        unsigned long class;
        /** I/O address */
        unsigned long ioaddr;
        /** IRQ */
        unsigned int irq;
};

/** PCI bus type */
#define BUS_TYPE_PCI 1

/** ISAPnP bus type */
#define BUS_TYPE_ISAPNP 2

/** EISA bus type */
#define BUS_TYPE_EISA 3

/** MCA bus type */
#define BUS_TYPE_MCA 4

/** ISA bus type */
#define BUS_TYPE_ISA 5

/** A hardware device */
struct device {
        /** Name */
        char name[16];
        /** Device description */
        struct device_description desc;
        /** Devices on the same bus */
        struct list_head siblings;
        /** Devices attached to this device */
        struct list_head children;
        /** Bus device */
        struct device *parent;
};

/**
 * A root device
 *
 * Root devices are system buses such as PCI, EISA, etc.
 *
 */
struct root_device {
        /** Device chain
         *
         * A root device has a NULL parent field.
         */
        struct device dev;
        /** Root device driver */
        struct root_driver *driver;
};

/** A root device driver */
struct root_driver {
        /**
         * Add root device
         *
         * @v rootdev   Root device
         * @ret rc      Return status code
         *
         * Called from probe_devices() for all root devices in the build.
         */
        int ( * probe ) ( struct root_device *rootdev );
        /**
         * Remove root device
         *
         * @v rootdev   Root device
         *
         * Called from remove_device() for all successfully-probed
         * root devices.
         */
        void ( * remove ) ( struct root_device *rootdev );
};

/** Root device table */
#define ROOT_DEVICES __table ( struct root_device, "root_devices" )

/** Declare a root device */
#define __root_device __table_entry ( ROOT_DEVICES, 01 )

#endif /* _GPXE_DEVICE_H */