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Diffstat (limited to 'device/dev_hdr.h')
| -rw-r--r-- | device/dev_hdr.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/device/dev_hdr.h b/device/dev_hdr.h new file mode 100644 index 0000000..b976caf --- /dev/null +++ b/device/dev_hdr.h @@ -0,0 +1,108 @@ +/* + * Mach Operating System + * Copyright (c) 1991,1990,1989 Carnegie Mellon University + * All Rights Reserved. + * + * Permission to use, copy, modify and distribute this software and its + * documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR + * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie Mellon + * the rights to redistribute these changes. + */ +/* + * Author: David B. Golub, Carnegie Mellon University + * Date: 3/89 + */ + +#ifndef _DEVICE_DEV_HDR_H_ +#define _DEVICE_DEV_HDR_H_ + +#include <mach/port.h> +#include <kern/lock.h> +#include <kern/queue.h> + +#include <device/conf.h> + +#ifdef i386 +#include <i386at/dev_hdr.h> +#else +#define mach_device device +#define mach_device_t device_t +#define MACH_DEVICE_NULL DEVICE_NULL +#define mach_device_reference device_reference +#define mach_device_deallocate device_deallocate +#define mach_convert_device_to_port convert_device_to_port +#endif + +/* + * Generic device header. May be allocated with the device, + * or built when the device is opened. + */ +struct mach_device { + decl_simple_lock_data(,ref_lock)/* lock for reference count */ + int ref_count; /* reference count */ + decl_simple_lock_data(, lock) /* lock for rest of state */ + short state; /* state: */ +#define DEV_STATE_INIT 0 /* not open */ +#define DEV_STATE_OPENING 1 /* being opened */ +#define DEV_STATE_OPEN 2 /* open */ +#define DEV_STATE_CLOSING 3 /* being closed */ + short flag; /* random flags: */ +#define D_EXCL_OPEN 0x0001 /* open only once */ + short open_count; /* number of times open */ + short io_in_progress; /* number of IOs in progress */ + boolean_t io_wait; /* someone waiting for IO to finish */ + + struct ipc_port *port; /* open port */ + queue_chain_t number_chain; /* chain for lookup by number */ + int dev_number; /* device number */ + int bsize; /* replacement for DEV_BSIZE */ + struct dev_ops *dev_ops; /* and operations vector */ +#ifdef i386 + struct device dev; /* the real device structure */ +#endif +}; +typedef struct mach_device *mach_device_t; +#define MACH_DEVICE_NULL ((mach_device_t)0) + +/* + * To find and remove device entries + */ +mach_device_t device_lookup(); /* by name */ + +void mach_device_reference(); +void mach_device_deallocate(); + +/* + * To find and remove port-to-device mappings + */ +device_t dev_port_lookup(); +void dev_port_enter(); +void dev_port_remove(); + +/* + * To call a routine on each device + */ +boolean_t dev_map(); + +/* + * To lock and unlock state and open-count + */ +#define device_lock(device) simple_lock(&(device)->lock) +#define device_unlock(device) simple_unlock(&(device)->lock) + +#endif /* _DEVICE_DEV_HDR_H_ */ |