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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.0 (the 'License'). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License."
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24: /*
25: * Copyright 1997-1998 by Apple Computer, Inc., All rights reserved.
26: * Copyright 1994-1997 NeXT Software, Inc., All rights reserved.
27: *
28: * IdeDisk.h - Exported Interface for IDE Disk device class.
29: *
30: * HISTORY
31: *
32: * 04-Mar-1996 Rakesh Dubey at NeXT
33: * Modified so that no memory is allocated at run-time.
34: *
35: * 07-Jul-1994 Rakesh Dubey at NeXT
36: * Created from original driver written by David Somayajulu.
37: */
38:
39: #ifdef DRIVER_PRIVATE
40:
41: #ifndef _BSD_DEV_IDEDISK_H
42: #define _BSD_DEV_IDEDISK_H 1
43:
44: #import <driverkit/return.h>
45: #import <driverkit/driverTypes.h>
46: #import <driverkit/IODisk.h>
47: #import <driverkit/kernelDiskMethods.h>
48:
49: #if (IO_DRIVERKIT_VERSION == 330)
50: #import <mach/time_stamp.h>
51: #else
52: #import <kern/queue.h>
53: #import <kern/time_stamp.h>
54: #endif
55:
56: #import <kernserv/clock_timer.h>
57: #import "IdeCntPublic.h"
58:
59: /*
60: * We will preallocate command buffers for doing I/O. This avoids a deadlock
61: * situation when we are running very low on memory. Comment out this #define
62: * if this behavior is not desired.
63: */
64: #define NO_ATA_RUNTIME_MEMORY_ALLOCATION
65:
66: /*
67: * Commands to be executed by I/O thread.
68: */
69: typedef enum {
70: IDEC_IOREQ, /* process IdeIoReq_t */
71: IDEC_READ, /* normal read */
72: IDEC_WRITE, /* normal write */
73: IDEC_ABORT, /* abort pending "needsDisk" I/Os */
74: IDEC_THREAD_ABORT, /* thread abort */
75: IDEC_INIT, /* initialize the ide drive */
76: } IdeCmd_t;
77:
78:
79: /*
80: * Command buffer. These are enqueued on one of the I/O queues by exported
81: * methods and dequeued and processed by the I/O thread.
82: */
83: typedef struct {
84: IdeCmd_t command; /* IDEC_IOREQ, etc. */
85: ideIoReq_t *ideIoReq; /* command block passed to controller,
86: (IDEC_IOREQ only) */
87: u_int block; /* IDE_READ and IDE_WRITE only */
88: u_int blockCnt; /* ditto */
89: void *buf; /* where to r/w, for all except IDEC_IOREQ */
90: vm_task_t client; /* address space containing *buf */
91: id waitLock; /* NXConditionLock */
92: void *pending; /* if non-NULL, async request; this is */
93: /* used to ioComplete: the operation. */
94:
95: unsigned needsDisk:1,
96: oneWay:1; /* 1 ==> no I/O complete */
97:
98: /*
99: * Fields valid at I/O complete time.
100: */
101: u_int bytesXfr; /* bytes actually moved
102: (IDEC_{READ,WRITE} only) */
103: IOReturn status; /* result */
104:
105: queue_chain_t link;
106: queue_chain_t bufLink;
107:
108: } ideBuf_t;
109:
110:
111:
112: @interface IdeDisk:IODisk<IODiskReadingAndWriting, IOPhysicalDiskMethods>
113: {
114: @private
115: /*
116: * The queues on which all I/Os are enqueued by exported methods.
117: */
118: queue_head_t _ioQueueDisk; /* for I/Os requiring disk */
119: queue_head_t _ioQueueNodisk; /* for other I/O */
120:
121: #ifdef NO_ATA_RUNTIME_MEMORY_ALLOCATION
122: queue_head_t _ideBufQueue;
123: id _ideBufLock;
124: #define MAX_NUM_ATABUF 128
125: ideBuf_t _ideBufPool[MAX_NUM_ATABUF];
126: #endif NO_ATA_RUNTIME_MEMORY_ALLOCATION
127:
128: /*
129: * NXConditionLock - protects the queues; I/O thread sleeps on this.
130: */
131: id _ioQLock;
132:
133: /*
134: * The pseudo controller to streamline interrupts, resets and diagnostics
135: * commands.
136: */
137: id _cntrlr;
138:
139: /*
140: * Commands to read and write from the disk are cached here.
141: */
142: unsigned _ideReadCommand;
143: unsigned _ideWriteCommand;
144:
145: ideDriveInfo_t _ideInfo;
146: unsigned _driveNum;
147: unsigned char _ideDriveName[32];
148: }
149:
150: /*
151: * Probe is invoked at load time. It determines what devices are on the
152: * bus and alloc's and init:'s an instance of this class for each one.
153: */
154: + (BOOL)probe:deviceDescription;
155: + (IODeviceStyle) deviceStyle;
156: + (Protocol **) requiredProtocols;
157: + (BOOL)hd_devsw_init:deviceDescription;
158:
159: - (ideDriveInfo_t)ideGetDriveInfo;
160: - (id)cntrlr;
161: - (unsigned)driveNum;
162:
163: @end
164:
165: #endif /* _BSD_DEV_IDEDISK_H */
166:
167: #endif /* DRIVER_PRIVATE */
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