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Root/branches/rewrite/i386/modules/BiosDisk/BiosDisk.cpp

Source at commit 1079 created 12 years 9 months ago.
By meklort, began implimenting Bios disk changes. Code taken from biosfn.c
1/*␊
2 * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊
3 *␊
4 * @APPLE_LICENSE_HEADER_START@␊
5 * ␊
6 * Portions Copyright (c) 1999-2003 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 2.0 (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 1993 NeXT Computer, Inc.␊
26 * All rights reserved.␊
27 */␊
28␊
29/* Copyright 2007 David Elliott␊
30 2007-12-30 dfe␊
31 - Enhanced code to normalize segment/offset to huge pointers so that any␊
32 linear address within the first MB of memory can be passed to BIOS␊
33 functions. This allows some of the __DATA sections to span into the␊
34 next segment and also allows stack variables to be used whereas the␊
35 old code could only operate on static data in the first 64k.␊
36 NOTE: Requires bios.s change to respect DS.␊
37 */␊
38/* Copyright 2007 VMware Inc.␊
39 2007-12-29 dfe␊
40 - Added ebiosEjectMedia␊
41 */␊
42␊
43/*␊
44 * Copyright (c) 2011 Evan Lojewski.␊
45 * - Converted to c++␊
46 * - Converted to UInt* style variable types␊
47 */␊
48␊
49#include <BiosDisk.hpp>␊
50␊
51extern "C"␊
52{␊
53#include "libsaio.h"␊
54#include "stdio.h"␊
55}␊
56 ␊
57BiosDisk::BiosDisk(const char* name)␊
58{␊
59 // Initialize␊
60 mValid = false;␊
61 mDiskID = 0;␊
62 mUsesEBIOS = 0;␊
63 mNoEmulation = false;␊
64 mBytesPerSector = 0;␊
65␊
66 ␊
67 // The correct format should be:␊
68 // bios:/hdX/␊
69 mBusType = "bios";␊
70␊
71 if(strncmp(mBusType, name, 4) != 0) name = NULL;␊
72 ␊
73 mName = name;␊
74 ␊
75 sscanf(name, "bios:/hd%d/", &mDiskID);␊
76 mDiskID += 0x80; // 0x80 = fixed disk␊
77 ␊
78 ␊
79 if(BIOSRead(0, 0, 1, 1) == 0 && GetDriveInfo() == 0) ␊
80 {␊
81 mBytesPerSector = mDriveInfo.params.phys_nbps;␊
82 printf("Disk: 0x%X (%d sectors)\n", mDiskID, mBytesPerSector); ␊
83 }␊
84 else␊
85 {␊
86 mValid = 0; // force invalid.␊
87 }␊
88}␊
89␊
90BiosDisk::~BiosDisk()␊
91{␊
92␊
93}␊
94␊
95IOReturn BiosDisk::Read(UInt64 sector, UInt64 size, UInt8* buffer)␊
96{␊
97 if(!isValid()) return kIOReturnNoDevice;␊
98 return kIOReturnSuccess;␊
99}␊
100␊
101␊
102IOReturn BiosDisk::Write(UInt64 sector, UInt64 size, UInt8* buffer)␊
103{␊
104 if(!isValid()) return kIOReturnNoDevice;␊
105 return kIOReturnNotWritable;␊
106}␊
107␊
108␊
109UInt8 BiosDisk::BIOSRead(UInt16 cylinder, UInt8 head, UInt8 sector, UInt8 count)␊
110{␊
111 if(sector == 0) return -1;␊
112 ␊
113 biosBuf_t bb;␊
114 int i;␊
115 ␊
116 bb.intno = 0x13;␊
117 bb.eax.r.h = 0x02;␊
118␊
119 for (i=0;;)␊
120 {␊
121 bb.ecx.r.h = cylinder;␊
122 bb.ecx.r.l = ((cylinder & 0x300) >> 2) | (sector & 0x3F);␊
123 bb.edx.r.h = head;␊
124 bb.edx.r.l = mDiskID;␊
125 bb.eax.r.l = count;␊
126 bb.ebx.rr = OFFSET(ptov(BIOS_ADDR));␊
127 bb.es = SEGMENT(ptov(BIOS_ADDR));␊
128␊
129 bios(&bb);␊
130 ␊
131 /* In case of a successful call, make sure we set AH (return code) to zero. */␊
132 if (bb.flags.cf == 0) bb.eax.r.h = 0;␊
133 ␊
134 /* Now we can really check for the return code (AH) value. */␊
135 if ((bb.eax.r.h == 0x00) || (i++ >= 5)) break;␊
136 ␊
137 /* reset disk subsystem and try again */␊
138 bb.eax.r.h = 0x00;␊
139 bios(&bb);␊
140 }␊
141 return bb.eax.r.h;␊
142}␊
143␊
144UInt8 BiosDisk::EBIOSRead(UInt64 sector, UInt8 count)␊
145{␊
146 biosBuf_t bb;␊
147 ␊
148 UInt8 i;␊
149 struct {␊
150 UInt8 size;␊
151 UInt8 reserved;␊
152 UInt8 numblocks;␊
153 UInt8 reserved2;␊
154 UInt16 bufferOffset;␊
155 UInt16 bufferSegment;␊
156 UInt64 startblock;␊
157 } addrpacket __attribute__((aligned(16))) = {0};␊
158 addrpacket.size = sizeof(addrpacket);␊
159 ␊
160 for (i=0;;) {␊
161 bb.intno = 0x13;␊
162 bb.eax.r.h = 0x42;␊
163 bb.edx.r.l = mDiskID;␊
164 bb.esi.rr = NORMALIZED_OFFSET((unsigned)&addrpacket);␊
165 bb.ds = NORMALIZED_SEGMENT((unsigned)&addrpacket);␊
166 addrpacket.reserved = addrpacket.reserved2 = 0;␊
167 addrpacket.numblocks = count;␊
168 addrpacket.bufferOffset = OFFSET(ptov(BIOS_ADDR));␊
169 addrpacket.bufferSegment = SEGMENT(ptov(BIOS_ADDR));␊
170 addrpacket.startblock = sector;␊
171 bios(&bb);␊
172 ␊
173 /* In case of a successful call, make sure we set AH (return code) to zero. */␊
174 if (bb.flags.cf == 0)␊
175 bb.eax.r.h = 0;␊
176 ␊
177 /* Now we can really check for the return code (AH) value. */␊
178 if ((bb.eax.r.h == 0x00) || (i++ >= 5))␊
179 break;␊
180 ␊
181 /* reset disk subsystem and try again */␊
182 bb.eax.r.h = 0x00;␊
183 bios(&bb);␊
184 }␊
185 return bb.eax.r.h;␊
186}␊
187␊
188UInt8 BiosDisk::EBIOSWrite(UInt64 sector, UInt8 count)␊
189{␊
190 biosBuf_t bb;␊
191␊
192 UInt8 i;␊
193 static struct {␊
194 UInt8 size;␊
195 UInt8 reserved;␊
196 UInt8 numblocks;␊
197 UInt8 reserved2;␊
198 UInt16 bufferOffset;␊
199 UInt16 bufferSegment;␊
200 UInt64 startblock;␊
201 } addrpacket __attribute__((aligned(16))) = {0};␊
202 addrpacket.size = sizeof(addrpacket);␊
203 ␊
204 for (i=0;;) {␊
205 bb.intno = 0x13;␊
206 bb.eax.r.l = 0; /* Don't verify */␊
207 bb.eax.r.h = 0x43;␊
208 bb.edx.r.l = mDiskID;␊
209 bb.esi.rr = NORMALIZED_OFFSET((unsigned)&addrpacket);␊
210 bb.ds = NORMALIZED_SEGMENT((unsigned)&addrpacket);␊
211 addrpacket.reserved = addrpacket.reserved2 = 0;␊
212 addrpacket.numblocks = count;␊
213 addrpacket.bufferOffset = OFFSET(ptov(BIOS_ADDR));␊
214 addrpacket.bufferSegment = SEGMENT(ptov(BIOS_ADDR));␊
215 addrpacket.startblock = sector;␊
216 bios(&bb);␊
217 ␊
218 /* In case of a successful call, make sure we set AH (return code) to zero. */␊
219 if (bb.flags.cf == 0)␊
220 bb.eax.r.h = 0;␊
221 ␊
222 /* Now we can really check for the return code (AH) value. */␊
223 if ((bb.eax.r.h == 0x00) || (i++ >= 5))␊
224 break;␊
225 ␊
226 /* reset disk subsystem and try again */␊
227 bb.eax.r.h = 0x00;␊
228 bios(&bb);␊
229 }␊
230 return bb.eax.r.h;␊
231}␊
232␊
233UInt8 BiosDisk::GetDriveInfo()␊
234{␊
235 return 0; // TODO: finish this␊
236}␊
237␊
238

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Revision: 1079