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Annotation of Gnu-Mach/device/dev_hdr.h, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Mach Operating System
                      3:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
                      4:  * All Rights Reserved.
                      5:  * 
                      6:  * Permission to use, copy, modify and distribute this software and its
                      7:  * documentation is hereby granted, provided that both the copyright
                      8:  * notice and this permission notice appear in all copies of the
                      9:  * software, derivative works or modified versions, and any portions
                     10:  * thereof, and that both notices appear in supporting documentation.
                     11:  * 
                     12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     15:  * 
                     16:  * Carnegie Mellon requests users of this software to return to
                     17:  * 
                     18:  *  Software Distribution Coordinator  or  [email protected]
                     19:  *  School of Computer Science
                     20:  *  Carnegie Mellon University
                     21:  *  Pittsburgh PA 15213-3890
                     22:  * 
                     23:  * any improvements or extensions that they make and grant Carnegie Mellon
                     24:  * the rights to redistribute these changes.
                     25:  */
                     26: /*
                     27:  *     Author: David B. Golub, Carnegie Mellon University
                     28:  *     Date:   3/89
                     29:  */
                     30: 
                     31: #ifndef        _DEVICE_DEV_HDR_H_
                     32: #define        _DEVICE_DEV_HDR_H_
                     33: 
                     34: #include <mach/port.h>
                     35: #include <kern/lock.h>
                     36: #include <kern/queue.h>
                     37: 
                     38: #include <device/conf.h>
                     39: 
                     40: #ifdef i386
                     41: #include <i386at/dev_hdr.h>
                     42: #else
                     43: #define mach_device                    device
                     44: #define mach_device_t                  device_t
                     45: #define MACH_DEVICE_NULL               DEVICE_NULL
                     46: #define mach_device_reference          device_reference
                     47: #define mach_device_deallocate         device_deallocate
                     48: #define mach_convert_device_to_port    convert_device_to_port
                     49: #endif
                     50: 
                     51: /*
                     52:  * Generic device header.  May be allocated with the device,
                     53:  * or built when the device is opened.
                     54:  */
                     55: struct mach_device {
                     56:        decl_simple_lock_data(,ref_lock)/* lock for reference count */
                     57:        int             ref_count;      /* reference count */
                     58:        decl_simple_lock_data(, lock)   /* lock for rest of state */
                     59:        short           state;          /* state: */
                     60: #define        DEV_STATE_INIT          0       /* not open  */
                     61: #define        DEV_STATE_OPENING       1       /* being opened */
                     62: #define        DEV_STATE_OPEN          2       /* open */
                     63: #define        DEV_STATE_CLOSING       3       /* being closed */
                     64:        short           flag;           /* random flags: */
                     65: #define        D_EXCL_OPEN             0x0001  /* open only once */
                     66:        short           open_count;     /* number of times open */
                     67:        short           io_in_progress; /* number of IOs in progress */
                     68:        boolean_t       io_wait;        /* someone waiting for IO to finish */
                     69: 
                     70:        struct ipc_port *port;          /* open port */
                     71:        queue_chain_t   number_chain;   /* chain for lookup by number */
                     72:        int             dev_number;     /* device number */
                     73:        int             bsize;          /* replacement for DEV_BSIZE */
                     74:        struct dev_ops  *dev_ops;       /* and operations vector */
                     75: #ifdef i386
                     76:        struct device   dev;            /* the real device structure */
                     77: #endif
                     78: };
                     79: typedef        struct mach_device *mach_device_t;
                     80: #define        MACH_DEVICE_NULL ((mach_device_t)0)
                     81: 
                     82: /*
                     83:  * To find and remove device entries
                     84:  */
                     85: mach_device_t  device_lookup();        /* by name */
                     86: 
                     87: void           mach_device_reference();
                     88: void           mach_device_deallocate();
                     89: 
                     90: /*
                     91:  * To find and remove port-to-device mappings
                     92:  */
                     93: device_t       dev_port_lookup();
                     94: void           dev_port_enter();
                     95: void           dev_port_remove();
                     96: 
                     97: /*
                     98:  * To call a routine on each device
                     99:  */
                    100: boolean_t      dev_map();
                    101: 
                    102: /*
                    103:  * To lock and unlock state and open-count
                    104:  */
                    105: #define        device_lock(device)     simple_lock(&(device)->lock)
                    106: #define        device_unlock(device)   simple_unlock(&(device)->lock)
                    107: 
                    108: #endif /* _DEVICE_DEV_HDR_H_ */

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