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

Source at commit 1083 created 12 years 9 months ago.
By meklort, add GetDriveInfo
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 mDriveInfo = (boot_drive_info_t*)malloc(sizeof(boot_drive_info_t));␊
79␊
80 if(BIOSRead(0, 0, 1, 1) == 0 && GetDriveInfo() == 0) ␊
81 {␊
82 mBytesPerSector = mDriveInfo->params.phys_nbps;␊
83 printf("Disk: 0x%X (%d sectors)\n", mDiskID, mBytesPerSector); ␊
84 }␊
85 else␊
86 {␊
87 mValid = 0; // force invalid.␊
88 }␊
89}␊
90␊
91BiosDisk::~BiosDisk()␊
92{␊
93 if(mDriveInfo) free(mDriveInfo);␊
94}␊
95␊
96IOReturn BiosDisk::Read(UInt64 sector, UInt64 size, UInt8* buffer)␊
97{␊
98 if(!isValid()) return kIOReturnNoDevice;␊
99 return kIOReturnSuccess;␊
100}␊
101␊
102␊
103IOReturn BiosDisk::Write(UInt64 sector, UInt64 size, UInt8* buffer)␊
104{␊
105 if(!isValid()) return kIOReturnNoDevice;␊
106 return kIOReturnNotWritable;␊
107}␊
108␊
109␊
110UInt8 BiosDisk::BIOSRead(UInt16 cylinder, UInt8 head, UInt8 sector, UInt8 count)␊
111{␊
112 if(sector == 0) return -1;␊
113 ␊
114 biosBuf_t bb;␊
115 int i;␊
116 ␊
117 bb.intno = 0x13;␊
118 bb.eax.r.h = 0x02;␊
119␊
120 for (i=0;;)␊
121 {␊
122 bb.ecx.r.h = cylinder;␊
123 bb.ecx.r.l = ((cylinder & 0x300) >> 2) | (sector & 0x3F);␊
124 bb.edx.r.h = head;␊
125 bb.edx.r.l = mDiskID;␊
126 bb.eax.r.l = count;␊
127 bb.ebx.rr = OFFSET(ptov(BIOS_ADDR));␊
128 bb.es = SEGMENT(ptov(BIOS_ADDR));␊
129␊
130 bios(&bb);␊
131 ␊
132 /* In case of a successful call, make sure we set AH (return code) to zero. */␊
133 if (bb.flags.cf == 0) bb.eax.r.h = 0;␊
134 ␊
135 /* Now we can really check for the return code (AH) value. */␊
136 if ((bb.eax.r.h == 0x00) || (i++ >= 5)) break;␊
137 ␊
138 /* reset disk subsystem and try again */␊
139 bb.eax.r.h = 0x00;␊
140 bios(&bb);␊
141 }␊
142 return bb.eax.r.h;␊
143}␊
144␊
145UInt8 BiosDisk::EBIOSRead(UInt64 sector, UInt8 count)␊
146{␊
147 biosBuf_t bb;␊
148 ␊
149 UInt8 i;␊
150 struct {␊
151 UInt8 size;␊
152 UInt8 reserved;␊
153 UInt8 numblocks;␊
154 UInt8 reserved2;␊
155 UInt16 bufferOffset;␊
156 UInt16 bufferSegment;␊
157 UInt64 startblock;␊
158 } addrpacket __attribute__((aligned(16))) = {0};␊
159 addrpacket.size = sizeof(addrpacket);␊
160 ␊
161 for (i=0;;) {␊
162 bb.intno = 0x13;␊
163 bb.eax.r.h = 0x42;␊
164 bb.edx.r.l = mDiskID;␊
165 bb.esi.rr = NORMALIZED_OFFSET((unsigned)&addrpacket);␊
166 bb.ds = NORMALIZED_SEGMENT((unsigned)&addrpacket);␊
167 addrpacket.reserved = addrpacket.reserved2 = 0;␊
168 addrpacket.numblocks = count;␊
169 addrpacket.bufferOffset = OFFSET(ptov(BIOS_ADDR));␊
170 addrpacket.bufferSegment = SEGMENT(ptov(BIOS_ADDR));␊
171 addrpacket.startblock = sector;␊
172 bios(&bb);␊
173 ␊
174 /* In case of a successful call, make sure we set AH (return code) to zero. */␊
175 if (bb.flags.cf == 0)␊
176 bb.eax.r.h = 0;␊
177 ␊
178 /* Now we can really check for the return code (AH) value. */␊
179 if ((bb.eax.r.h == 0x00) || (i++ >= 5))␊
180 break;␊
181 ␊
182 /* reset disk subsystem and try again */␊
183 bb.eax.r.h = 0x00;␊
184 bios(&bb);␊
185 }␊
186 return bb.eax.r.h;␊
187}␊
188␊
189UInt8 BiosDisk::EBIOSWrite(UInt64 sector, UInt8 count)␊
190{␊
191 biosBuf_t bb;␊
192␊
193 UInt8 i;␊
194 static struct {␊
195 UInt8 size;␊
196 UInt8 reserved;␊
197 UInt8 numblocks;␊
198 UInt8 reserved2;␊
199 UInt16 bufferOffset;␊
200 UInt16 bufferSegment;␊
201 UInt64 startblock;␊
202 } addrpacket __attribute__((aligned(16))) = {0};␊
203 addrpacket.size = sizeof(addrpacket);␊
204 ␊
205 for (i=0;;) {␊
206 bb.intno = 0x13;␊
207 bb.eax.r.l = 0; /* Don't verify */␊
208 bb.eax.r.h = 0x43;␊
209 bb.edx.r.l = mDiskID;␊
210 bb.esi.rr = NORMALIZED_OFFSET((unsigned)&addrpacket);␊
211 bb.ds = NORMALIZED_SEGMENT((unsigned)&addrpacket);␊
212 addrpacket.reserved = addrpacket.reserved2 = 0;␊
213 addrpacket.numblocks = count;␊
214 addrpacket.bufferOffset = OFFSET(ptov(BIOS_ADDR));␊
215 addrpacket.bufferSegment = SEGMENT(ptov(BIOS_ADDR));␊
216 addrpacket.startblock = sector;␊
217 bios(&bb);␊
218 ␊
219 /* In case of a successful call, make sure we set AH (return code) to zero. */␊
220 if (bb.flags.cf == 0)␊
221 bb.eax.r.h = 0;␊
222 ␊
223 /* Now we can really check for the return code (AH) value. */␊
224 if ((bb.eax.r.h == 0x00) || (i++ >= 5))␊
225 break;␊
226 ␊
227 /* reset disk subsystem and try again */␊
228 bb.eax.r.h = 0x00;␊
229 bios(&bb);␊
230 }␊
231 return bb.eax.r.h;␊
232}␊
233␊
234UInt8 BiosDisk::GetDriveInfo()␊
235{␊
236 // we use the BIOS_ADDR (disk buffer) to ensure that the buffer␊
237 // is in low mem␊
238 boot_drive_info_t* actualInfo = mDriveInfo;␊
239 mDriveInfo = (boot_drive_info_t*)BIOS_ADDR;␊
240 biosBuf_t bb;␊
241␉int ret = 0;␊
242␉␊
243#if UNUSED␊
244␉if (maxhd == 0) {␊
245␉␉bb.intno = 0x13;␊
246␉␉bb.eax.r.h = 0x08;␊
247␉␉bb.edx.r.l = 0x80;␊
248␉␉bios(&bb);␊
249␉␉if (bb.flags.cf == 0)␊
250␉␉␉maxhd = 0x7f + bb.edx.r.l;␊
251␉};␊
252␉␊
253#endif␊
254␉␊
255␉/* Check for El Torito no-emulation mode. */␊
256␉//dp->no_emulation = is_no_emulation(drive);␊
257 ␊
258␉/* Check drive for EBIOS support. */␊
259␉bb.intno = 0x13;␊
260␉bb.eax.r.h = 0x41;␊
261␉bb.edx.r.l = mDiskID;␊
262␉bb.ebx.rr = 0x55aa;␊
263␉bios(&bb);␊
264␉␊
265␉if ((bb.ebx.rr == 0xaa55) && (bb.flags.cf == 0)) {␊
266␉␉/* Get flags for supported operations. */␊
267␉␉mUsesEBIOS = bb.ecx.r.l;␊
268␉}␊
269␉␊
270␉if (mUsesEBIOS & (EBIOS_ENHANCED_DRIVE_INFO | EBIOS_LOCKING_ACCESS | EBIOS_FIXED_DISK_ACCESS)) {␊
271␉␉/* Get EBIOS drive info. */␊
272␉␉␊
273␉␉mDriveInfo->params.buf_size = sizeof(mDriveInfo->params);␊
274␉␉bb.intno = 0x13;␊
275␉␉bb.eax.r.h = 0x48;␊
276␉␉bb.edx.r.l = mDiskID;␊
277␉␉bb.esi.rr = NORMALIZED_OFFSET((unsigned)&mDriveInfo->params);␊
278␉␉bb.ds␉ = NORMALIZED_SEGMENT((unsigned)&mDriveInfo->params);␊
279␉␉bios(&bb);␊
280 ␊
281␉␉if (bb.flags.cf != 0 /* || params.phys_sectors < 2097152 */) {␊
282␉␉␉mUsesEBIOS = 0;␊
283␉␉␉mDriveInfo->params.buf_size = 1;␊
284␉␉}␊
285␉␉else␊
286␉␉{␊
287␉␉␉if (mDiskID >= BASE_HD_DRIVE &&␊
288␉␉␉␉(mUsesEBIOS & EBIOS_ENHANCED_DRIVE_INFO) &&␊
289␉␉␉␉mDriveInfo->params.buf_size >= 30 &&␊
290␉␉␉␉!(mDriveInfo->params.dpte_offset == 0xFFFF && mDriveInfo->params.dpte_segment == 0xFFFF)) {␊
291 void *ptr = (void *)(mDriveInfo->params.dpte_offset + ((unsigned int)mDriveInfo->params.dpte_segment << 4));␊
292 bcopy(ptr, &mDriveInfo->dpte, sizeof(mDriveInfo->dpte));␊
293␉␉␉}␊
294␉␉}␊
295␉}␊
296 ␊
297 /*␊
298 * zef: This code will fail on recent JMicron and Intel option ROMs␊
299 */ ␊
300 //␉if (mDriveInfo->params.phys_heads == 0 || mDriveInfo->params.phys_spt == 0) {␊
301 //␉␉/* Either it's not EBIOS, or EBIOS didn't tell us. */␊
302 //␉␉bb.intno = 0x13;␊
303 //␉␉bb.eax.r.h = 0x08;␊
304 //␉␉bb.edx.r.l = drive;␊
305 //␉␉bios(&bb);␊
306 //␉␉if (bb.flags.cf == 0 && bb.eax.r.h == 0) {␊
307 //␉␉␉unsigned long cyl;␊
308 //␉␉␉unsigned long sec;␊
309 //␉␉␉unsigned long hds;␊
310 //␉␉␊
311 //␉␉␉hds = bb.edx.r.h;␊
312 //␉␉␉sec = bb.ecx.r.l & 0x3F;␊
313 //␉␉␉if ((dp->uses_ebios & EBIOS_ENHANCED_DRIVE_INFO) && (sec != 0)) {␊
314 //␉␉␉␉cyl = (mDriveInfo->params.phys_sectors / ((hds + 1) * sec)) - 1;␊
315 //␉␉␉} else {␊
316 //␉␉␉␉cyl = bb.ecx.r.h | ((bb.ecx.r.l & 0xC0) << 2);␊
317 //␉␉␉}␊
318 //␉␉␉mDriveInfo->params.phys_heads = hds; ␊
319 //␉␉␉mDriveInfo->params.phys_spt = sec;␊
320 //␉␉␉mDriveInfo->params.phys_cyls = cyl;␊
321 //␉␉} else {␊
322 //␉␉␉ret = -1;␊
323 //␉␉}␊
324 //␉}␊
325 /*␊
326 if (dp->no_emulation) {␊
327 // Some BIOSes give us erroneous EBIOS support information.␊
328 // Assume that if you're on a CD, then you can use␊
329 // EBIOS disk calls.␊
330 //␊
331 dp->uses_ebios |= EBIOS_FIXED_DISK_ACCESS;␊
332 }*/␊
333 ␊
334␉if (ret == 0) {␊
335␉␉mValid = 1;␊
336␉}␊
337␊
338 bcopy(mDriveInfo, actualInfo, sizeof(boot_drive_info_t));␊
339 mDriveInfo = actualInfo;␊
340 ␊
341␉return ret;␊
342}␊
343␊
344

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