disk.c@ 78571

Last change on this file since 78571 was 78571, checked in by vboxsync, 6 years ago
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1	/* $Id: disk.c 78571 2019-05-17 14:24:30Z vboxsync $ */
2	/** @file
3	* PC BIOS - ???
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	* --------------------------------------------------------------------
17	*
18	* This code is based on:
19	*
20	* ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
21	*
22	* Copyright (C) 2002 MandrakeSoft S.A.
23	*
24	* MandrakeSoft S.A.
25	* 43, rue d'Aboukir
26	* 75002 Paris - France
27	* http://www.linux-mandrake.com/
28	* http://www.mandrakesoft.com/
29	*
30	* This library is free software; you can redistribute it and/or
31	* modify it under the terms of the GNU Lesser General Public
32	* License as published by the Free Software Foundation; either
33	* version 2 of the License, or (at your option) any later version.
34	*
35	* This library is distributed in the hope that it will be useful,
36	* but WITHOUT ANY WARRANTY; without even the implied warranty of
37	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
38	* Lesser General Public License for more details.
39	*
40	* You should have received a copy of the GNU Lesser General Public
41	* License along with this library; if not, write to the Free Software
42	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
43	*
44	*/
45
46	/*
47	* Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
48	* other than GPL or LGPL is available it will apply instead, Oracle elects to use only
49	* the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
50	* a choice of LGPL license versions is made available with the language indicating
51	* that LGPLv2 or any later version may be used, or where a choice of which version
52	* of the LGPL is applied is otherwise unspecified.
53	*/
54
55
56	#include <stdint.h>
57	#include "biosint.h"
58	#include "inlines.h"
59	#include "ebda.h"
60	#include "ata.h"
61
62
63	#if DEBUG_INT13_HD
64	# define BX_DEBUG_INT13_HD(...) BX_DEBUG(__VA_ARGS__)
65	#else
66	# define BX_DEBUG_INT13_HD(...)
67	#endif
68
69	/* Generic disk read/write routine signature. */
70	typedef __fastcall (* dsk_rw_func)(bio_dsk_t __far *bios_dsk);
71
72	/* Controller specific disk access routines. Declared as a union to reduce
73	* the need for conditionals when choosing between read/write functions.
74	* Note that we get away with using near pointers, which is nice.
75	*/
76	typedef union {
77	struct {
78	dsk_rw_func read;
79	dsk_rw_func write;
80	} s;
81	dsk_rw_func a[2];
82	} dsk_acc_t;
83
84	/* Pointers to HW specific disk access routines. */
85	dsk_acc_t dskacc[DSKTYP_CNT] = {
86	[DSK_TYPE_ATA] = { ata_read_sectors, ata_write_sectors },
87	#ifdef VBOX_WITH_AHCI
88	[DSK_TYPE_AHCI] = { ahci_read_sectors, ahci_write_sectors },
89	#endif
90	#ifdef VBOX_WITH_SCSI
91	[DSK_TYPE_SCSI] = { scsi_read_sectors, scsi_write_sectors },
92	#endif
93	};
94
95
96	/// @todo put in a header
97	#define AX r.gr.u.r16.ax
98	#define BX r.gr.u.r16.bx
99	#define CX r.gr.u.r16.cx
100	#define DX r.gr.u.r16.dx
101	#define SI r.gr.u.r16.si
102	#define DI r.gr.u.r16.di
103	#define BP r.gr.u.r16.bp
104	#define ELDX r.gr.u.r16.sp
105	#define DS r.ds
106	#define ES r.es
107	#define FLAGS r.ra.flags.u.r16.flags
108
109
110	/*
111	* Build translated CHS geometry given a disk size in sectors. Based on
112	* Phoenix EDD 3.0. This is used as a fallback to generate sane logical
113	* geometry in case none was provided in CMOS.
114	*/
115	void set_geom_lba(chs_t __far *lgeo, uint64_t nsectors64)
116	{
117	uint32_t limit = 8257536; /* 1024 * 128 * 63 */
118	uint32_t nsectors;
119	unsigned heads = 255;
120	int i;
121
122	nsectors = (nsectors64 >> 32) ? 0xFFFFFFFFL : (uint32_t)nsectors64;
123	/* Start with ~4GB limit, go down to 504MB. */
124	for (i = 0; i < 4; ++i) {
125	if (nsectors <= limit)
126	heads = (heads + 1) / 2;
127	limit /= 2;
128	}
129
130	lgeo->cylinders = nsectors / (heads * 63UL);
131	if (lgeo->cylinders > 1024)
132	lgeo->cylinders = 1024;
133	lgeo->heads = heads;
134	lgeo->spt = 63; /* Always 63 sectors per track, the maximum. */
135	}
136
137	int edd_fill_dpt(dpt_t __far dpt, bio_dsk_t __far bios_dsk, uint8_t device)
138	{
139	uint16_t ebda_seg = read_word(0x0040,0x000E);
140
141	/* Check if buffer is large enough. */
142	if (dpt->size < 0x1a)
143	return -1;
144
145	/* Fill in EDD 1.x table. */
146	if (dpt->size >= 0x1a) {
147	uint64_t lba;
148
149	dpt->size = 0x1a;
150	dpt->blksize = bios_dsk->devices[device].blksize;
151
152	if (bios_dsk->devices[device].device == DSK_DEVICE_CDROM) {
153	dpt->infos = 0x74; /* Removable, media change, lockable, max values */
154	dpt->cylinders = 0xffffffff;
155	dpt->heads = 0xffffffff;
156	dpt->spt = 0xffffffff;
157	dpt->sector_count1 = 0xffffffff;
158	dpt->sector_count2 = 0xffffffff;
159	} else {
160	dpt->infos = 0x02; // geometry is valid
161	dpt->cylinders = bios_dsk->devices[device].pchs.cylinders;
162	dpt->heads = bios_dsk->devices[device].pchs.heads;
163	dpt->spt = bios_dsk->devices[device].pchs.spt;
164	#if 1
165	lba = bios_dsk->devices[device].sectors;
166	#else
167	// Makes PC DOS 7.1 FDISK32 happy
168	lba = (uint32_t)dpt->cylinders * dpt->heads * dpt->spt;
169	#endif
170	dpt->sector_count1 = lba;
171	dpt->sector_count2 = lba >> 32;
172	}
173	}
174
175	/* Fill in EDD 2.x table. */
176	if (dpt->size >= 0x1e) {
177	uint8_t channel, irq, mode, checksum, i, xlation;
178	uint16_t iobase1, iobase2, options;
179
180	dpt->size = 0x1e;
181	dpt->dpte_segment = ebda_seg;
182	dpt->dpte_offset = (uint16_t)&EbdaData->bdisk.dpte;
183
184	// Fill in dpte
185	channel = device / 2;
186	iobase1 = bios_dsk->channels[channel].iobase1;
187	iobase2 = bios_dsk->channels[channel].iobase2;
188	irq = bios_dsk->channels[channel].irq;
189	mode = bios_dsk->devices[device].mode;
190	xlation = bios_dsk->devices[device].translation;
191
192	options = (xlation == GEO_TRANSLATION_NONE ? 0 : 1 << 3); /* CHS translation */
193	options \|= (1 << 4); /* LBA translation */
194	if (bios_dsk->devices[device].device == DSK_DEVICE_CDROM) {
195	options \|= (1 << 5); /* Removable device */
196	options \|= (1 << 6); /* ATAPI device */
197	}
198	#if VBOX_BIOS_CPU >= 80386
199	options \|= (mode == ATA_MODE_PIO32 ? 1 : 0 << 7);
200	#endif
201	options \|= (xlation == GEO_TRANSLATION_LBA ? 1 : 0 << 9);
202	options \|= (xlation == GEO_TRANSLATION_RECHS ? 3 : 0 << 9);
203
204	bios_dsk->dpte.iobase1 = iobase1;
205	bios_dsk->dpte.iobase2 = iobase2;
206	bios_dsk->dpte.prefix = (0xe \| (device % 2)) << 4;
207	bios_dsk->dpte.unused = 0xcb;
208	bios_dsk->dpte.irq = irq;
209	bios_dsk->dpte.blkcount = 1;
210	bios_dsk->dpte.dma = 0;
211	bios_dsk->dpte.pio = 0;
212	bios_dsk->dpte.options = options;
213	bios_dsk->dpte.reserved = 0;
214	bios_dsk->dpte.revision = 0x11;
215
216	checksum = 0;
217	for (i = 0; i < 15; ++i)
218	checksum += read_byte(ebda_seg, (uint16_t)&EbdaData->bdisk.dpte + i);
219	checksum = -checksum;
220	bios_dsk->dpte.checksum = checksum;
221	}
222
223	/* Fill in EDD 3.x table. */
224	if (dpt->size >= 0x42) {
225	uint8_t channel, iface, checksum, i;
226	uint16_t iobase1;
227
228	channel = device / 2;
229	iface = bios_dsk->channels[channel].iface;
230	iobase1 = bios_dsk->channels[channel].iobase1;
231
232	dpt->size = 0x42;
233	dpt->key = 0xbedd;
234	dpt->dpi_length = 0x24;
235	dpt->reserved1 = 0;
236	dpt->reserved2 = 0;
237
238	if (iface == ATA_IFACE_ISA) {
239	dpt->host_bus[0] = 'I';
240	dpt->host_bus[1] = 'S';
241	dpt->host_bus[2] = 'A';
242	dpt->host_bus[3] = ' ';
243	}
244	else {
245	// FIXME PCI
246	}
247	dpt->iface_type[0] = 'A';
248	dpt->iface_type[1] = 'T';
249	dpt->iface_type[2] = 'A';
250	dpt->iface_type[3] = ' ';
251	dpt->iface_type[4] = ' ';
252	dpt->iface_type[5] = ' ';
253	dpt->iface_type[6] = ' ';
254	dpt->iface_type[7] = ' ';
255
256	if (iface == ATA_IFACE_ISA) {
257	((uint16_t __far *)dpt->iface_path)[0] = iobase1;
258	((uint16_t __far *)dpt->iface_path)[1] = 0;
259	((uint32_t __far *)dpt->iface_path)[1] = 0;
260	}
261	else {
262	// FIXME PCI
263	}
264	((uint16_t __far *)dpt->device_path)[0] = device & 1; // device % 2; @todo: correct?
265	((uint16_t __far *)dpt->device_path)[1] = 0;
266	((uint32_t __far *)dpt->device_path)[1] = 0;
267
268	checksum = 0;
269	for (i = 30; i < 64; i++)
270	checksum += ((uint8_t __far *)dpt)[i];
271	checksum = -checksum;
272	dpt->checksum = checksum;
273	}
274	return 0;
275	}
276
277	void BIOSCALL int13_harddisk(disk_regs_t r)
278	{
279	uint32_t lba;
280	uint16_t cylinder, head, sector;
281	uint16_t nlc, nlh, nlspt;
282	uint16_t count;
283	uint8_t device, status;
284	bio_dsk_t __far *bios_dsk;
285
286	BX_DEBUG_INT13_HD("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", __func__, AX, BX, CX, DX, ES);
287
288	SET_IF(); /* INT 13h always returns with interrupts enabled. */
289
290	bios_dsk = read_word(0x0040,0x000E) :> &EbdaData->bdisk;
291	write_byte(0x0040, 0x008e, 0); // clear completion flag
292
293	// basic check : device has to be defined
294	if ( (GET_ELDL() < 0x80) \|\| (GET_ELDL() >= 0x80 + BX_MAX_STORAGE_DEVICES) ) {
295	BX_DEBUG("%s: function %02x, ELDL out of range %02x\n", __func__, GET_AH(), GET_ELDL());
296	goto int13_fail;
297	}
298
299	// Get the ata channel
300	device = bios_dsk->hdidmap[GET_ELDL()-0x80];
301
302	// basic check : device has to be valid
303	if (device >= BX_MAX_STORAGE_DEVICES) {
304	BX_DEBUG("%s: function %02x, unmapped device for ELDL=%02x\n", __func__, GET_AH(), GET_ELDL());
305	goto int13_fail;
306	}
307
308	switch (GET_AH()) {
309
310	case 0x00: /* disk controller reset */
311	#ifdef VBOX_WITH_SCSI
312	/* SCSI controller does not need a reset. */
313	if (!VBOX_IS_SCSI_DEVICE(device))
314	#endif
315	ata_reset (device);
316	goto int13_success;
317	break;
318
319	case 0x01: /* read disk status */
320	status = read_byte(0x0040, 0x0074);
321	SET_AH(status);
322	SET_DISK_RET_STATUS(0);
323	/* set CF if error status read */
324	if (status) goto int13_fail_nostatus;
325	else goto int13_success_noah;
326	break;
327
328	case 0x02: // read disk sectors
329	case 0x03: // write disk sectors
330	case 0x04: // verify disk sectors
331
332	count = GET_AL();
333	cylinder = GET_CH();
334	cylinder \|= ( ((uint16_t) GET_CL()) << 2) & 0x300;
335	sector = (GET_CL() & 0x3f);
336	head = GET_DH();
337
338	/* Segment and offset are in ES:BX. */
339	if ( (count > 128) \|\| (count == 0) ) {
340	BX_INFO("%s: function %02x, count out of range!\n", __func__, GET_AH());
341	goto int13_fail;
342	}
343
344	/* Get the logical CHS geometry. */
345	nlc = bios_dsk->devices[device].lchs.cylinders;
346	nlh = bios_dsk->devices[device].lchs.heads;
347	nlspt = bios_dsk->devices[device].lchs.spt;
348
349	/* Sanity check the geometry. */
350	if( (cylinder >= nlc) \|\| (head >= nlh) \|\| (sector > nlspt )) {
351	BX_INFO("%s: function %02x, disk %02x, parameters out of range %04x/%04x/%04x!\n", __func__, GET_AH(), GET_DL(), cylinder, head, sector);
352	goto int13_fail;
353	}
354
355	// FIXME verify
356	if ( GET_AH() == 0x04 )
357	goto int13_success;
358
359	/* If required, translate LCHS to LBA and execute command. */
360	/// @todo The IS_SCSI_DEVICE check should be redundant...
361	if (( (bios_dsk->devices[device].pchs.heads != nlh) \|\| (bios_dsk->devices[device].pchs.spt != nlspt)) \|\| VBOX_IS_SCSI_DEVICE(device)) {
362	lba = ((((uint32_t)cylinder * (uint32_t)nlh) + (uint32_t)head) * (uint32_t)nlspt) + (uint32_t)sector - 1;
363	sector = 0; // this forces the command to be lba
364	}
365
366	BX_DEBUG_INT13_HD("%s: %d sectors from lba %lu @ %04x:%04x\n", __func__,
367	count, lba, ES, BX);
368
369	/* Clear the count of transferred sectors/bytes. */
370	bios_dsk->drqp.trsfsectors = 0;
371	bios_dsk->drqp.trsfbytes = 0;
372
373	/* Pass request information to low level disk code. */
374	bios_dsk->drqp.lba = lba;
375	bios_dsk->drqp.buffer = MK_FP(ES, BX);
376	bios_dsk->drqp.nsect = count;
377	bios_dsk->drqp.sect_sz = 512; /// @todo device specific?
378	bios_dsk->drqp.cylinder = cylinder;
379	bios_dsk->drqp.head = head;
380	bios_dsk->drqp.sector = sector;
381	bios_dsk->drqp.dev_id = device;
382
383	status = dskacc[bios_dsk->devices[device].type].a[GET_AH() - 0x02](bios_dsk);
384
385	// Set nb of sector transferred
386	SET_AL(bios_dsk->drqp.trsfsectors);
387
388	if (status != 0) {
389	BX_INFO("%s: function %02x, error %02x !\n", __func__, GET_AH(), status);
390	SET_AH(0x0c);
391	goto int13_fail_noah;
392	}
393
394	goto int13_success;
395	break;
396
397	case 0x05: /* format disk track */
398	BX_INFO("format disk track called\n");
399	goto int13_success;
400	break;
401
402	#ifdef VBOX_WITH_SCSIz
403	case 0x06: /* identify SCSI devices */
404	if (VBOX_IS_SCSI_DEVICE(device)\|\| 1) {
405	BX_INFO("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", __func__, AX, BX, CX, DX, ES);
406	BX_INFO("%s: function %02xh detected SCSI drive\n", __func__, GET_AH());
407	SET_BH(0);
408	SET_BL(0);
409	SET_AL(0x80);
410	goto int13_success;
411	}
412	BX_INFO("%s no SCSI drives, returns fail\n", __func__);
413	goto int13_fail;
414	break;
415	#endif
416	case 0x08: /* read disk drive parameters */
417
418	/* Get the logical geometry from internal table. */
419	#if 0
420	/* Windows 3.1 FastDisk (wdctrl) insists on this */
421	nlc = bios_dsk->devices[device].lchs.cylinders - 1;
422	#else
423	nlc = bios_dsk->devices[device].lchs.cylinders;
424	#endif
425	nlh = bios_dsk->devices[device].lchs.heads;
426	nlspt = bios_dsk->devices[device].lchs.spt;
427
428	count = bios_dsk->hdcount;
429	/* Maximum cylinder number is just one less than the number of cylinders. */
430	nlc = nlc - 1; /* 0 based , last sector not used */
431	SET_AL(0);
432	SET_CH(nlc & 0xff);
433	SET_CL(((nlc >> 2) & 0xc0) \| (nlspt & 0x3f));
434	SET_DH(nlh - 1);
435	SET_DL(count); /* FIXME returns 0, 1, or n hard drives */
436
437	// FIXME should set ES & DI
438	/// @todo Actually, the above comment is nonsense.
439
440	goto int13_success;
441	break;
442
443	case 0x10: /* check drive ready */
444	// should look at 40:8E also???
445
446	// Read the status from controller
447	status = inb(bios_dsk->channels[device/2].iobase1 + ATA_CB_STAT);
448	if ( (status & ( ATA_CB_STAT_BSY \| ATA_CB_STAT_RDY )) == ATA_CB_STAT_RDY ) {
449	goto int13_success;
450	} else {
451	SET_AH(0xAA);
452	goto int13_fail_noah;
453	}
454	break;
455
456	case 0x15: /* read disk drive size */
457
458	/* Get the physical geometry from internal table. */
459	cylinder = bios_dsk->devices[device].pchs.cylinders;
460	head = bios_dsk->devices[device].pchs.heads;
461	sector = bios_dsk->devices[device].pchs.spt;
462
463	/* Calculate sector count seen by old style INT 13h. */
464	lba = (uint32_t)cylinder * head * sector;
465	CX = lba >> 16;
466	DX = lba & 0xffff;
467
468	SET_AH(3); // hard disk accessible
469	goto int13_success_noah;
470	break;
471
472	case 0x09: /* initialize drive parameters */
473	case 0x0c: /* seek to specified cylinder */
474	case 0x0d: /* alternate disk reset */
475	case 0x11: /* recalibrate */
476	case 0x14: /* controller internal diagnostic */
477	BX_INFO("%s: function %02xh unimplemented, returns success\n", __func__, GET_AH());
478	goto int13_success;
479	break;
480
481	case 0x0a: /* read disk sectors with ECC */
482	case 0x0b: /* write disk sectors with ECC */
483	case 0x18: // set media type for format
484	default:
485	BX_INFO("%s: function %02xh unsupported, returns fail\n", __func__, GET_AH());
486	goto int13_fail;
487	break;
488	}
489
490	int13_fail:
491	SET_AH(0x01); // defaults to invalid function in AH or invalid parameter
492	int13_fail_noah:
493	SET_DISK_RET_STATUS(GET_AH());
494	int13_fail_nostatus:
495	SET_CF(); // error occurred
496	return;
497
498	int13_success:
499	SET_AH(0x00); // no error
500	int13_success_noah:
501	SET_DISK_RET_STATUS(0x00);
502	CLEAR_CF(); // no error
503	return;
504	}
505
506	void BIOSCALL int13_harddisk_ext(disk_regs_t r)
507	{
508	uint64_t lba;
509	uint16_t segment, offset;
510	uint8_t device, status;
511	uint16_t count;
512	uint8_t type;
513	bio_dsk_t __far *bios_dsk;
514	int13ext_t __far *i13_ext;
515	#if 0
516	uint16_t ebda_seg = read_word(0x0040,0x000E);
517	uint16_t npc, nph, npspt;
518	uint16_t size;
519	dpt_t __far *dpt;
520	#endif
521
522	bios_dsk = read_word(0x0040,0x000E) :> &EbdaData->bdisk;
523
524	BX_DEBUG_INT13_HD("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x DS=%04x SI=%04x\n",
525	__func__, AX, BX, CX, DX, ES, DS, SI);
526
527	write_byte(0x0040, 0x008e, 0); // clear completion flag
528
529	// basic check : device has to be defined
530	if ( (GET_ELDL() < 0x80) \|\| (GET_ELDL() >= 0x80 + BX_MAX_STORAGE_DEVICES) ) {
531	BX_DEBUG("%s: function %02x, ELDL out of range %02x\n", __func__, GET_AH(), GET_ELDL());
532	goto int13x_fail;
533	}
534
535	// Get the ata channel
536	device = bios_dsk->hdidmap[GET_ELDL()-0x80];
537
538	// basic check : device has to be valid
539	if (device >= BX_MAX_STORAGE_DEVICES) {
540	BX_DEBUG("%s: function %02x, unmapped device for ELDL=%02x\n", __func__, GET_AH(), GET_ELDL());
541	goto int13x_fail;
542	}
543
544	switch (GET_AH()) {
545	case 0x41: // IBM/MS installation check
546	BX=0xaa55; // install check
547	SET_AH(0x30); // EDD 3.0
548	CX=0x0007; // ext disk access and edd, removable supported
549	goto int13x_success_noah;
550	break;
551
552	case 0x42: // IBM/MS extended read
553	case 0x43: // IBM/MS extended write
554	case 0x44: // IBM/MS verify
555	case 0x47: // IBM/MS extended seek
556
557	/* Get a pointer to the extended structure. */
558	i13_ext = DS :> (int13ext_t *)SI;
559
560	count = i13_ext->count;
561	segment = i13_ext->segment;
562	offset = i13_ext->offset;
563
564	// Get 64 bits lba and check
565	lba = i13_ext->lba2;
566	lba <<= 32;
567	lba \|= i13_ext->lba1;
568
569	BX_DEBUG_INT13_HD("%s: %d sectors from LBA 0x%llx @ %04x:%04x\n", __func__,
570	count, lba, segment, offset);
571
572	type = bios_dsk->devices[device].type;
573	if (lba >= bios_dsk->devices[device].sectors) {
574	BX_INFO("%s: function %02x. LBA out of range\n", __func__, GET_AH());
575	goto int13x_fail;
576	}
577
578	/* Don't bother with seek or verify. */
579	if (( GET_AH() == 0x44 ) \|\| ( GET_AH() == 0x47 ))
580	goto int13x_success;
581
582	/* Clear the count of transferred sectors/bytes. */
583	bios_dsk->drqp.trsfsectors = 0;
584	bios_dsk->drqp.trsfbytes = 0;
585
586	/* Pass request information to low level disk code. */
587	bios_dsk->drqp.lba = lba;
588	bios_dsk->drqp.buffer = MK_FP(segment, offset);
589	bios_dsk->drqp.nsect = count;
590	bios_dsk->drqp.sect_sz = 512; /// @todo device specific?
591	bios_dsk->drqp.sector = 0; /* Indicate LBA. */
592	bios_dsk->drqp.dev_id = device;
593
594	/* Execute the read or write command. */
595	status = dskacc[type].a[GET_AH() - 0x42](bios_dsk);
596	count = bios_dsk->drqp.trsfsectors;
597	i13_ext->count = count;
598
599	if (status != 0) {
600	BX_INFO("%s: function %02x, error %02x !\n", __func__, GET_AH(), status);
601	SET_AH(0x0c);
602	goto int13x_fail_noah;
603	}
604
605	goto int13x_success;
606	break;
607
608	case 0x45: // IBM/MS lock/unlock drive
609	case 0x49: // IBM/MS extended media change
610	goto int13x_success; // Always success for HD
611	break;
612
613	case 0x46: // IBM/MS eject media
614	SET_AH(0xb2); // Volume Not Removable
615	goto int13x_fail_noah; // Always fail for HD
616	break;
617
618	case 0x48: // IBM/MS get drive parameters
619	if (edd_fill_dpt(DS :> (dpt_t *)SI, bios_dsk, device))
620	goto int13x_fail;
621	else
622	goto int13x_success;
623	break;
624
625	case 0x4e: // // IBM/MS set hardware configuration
626	// DMA, prefetch, PIO maximum not supported
627	switch (GET_AL()) {
628	case 0x01:
629	case 0x03:
630	case 0x04:
631	case 0x06:
632	goto int13x_success;
633	break;
634	default :
635	goto int13x_fail;
636	}
637	break;
638
639	case 0x50: // IBM/MS send packet command
640	default:
641	BX_INFO("%s: function %02xh unsupported, returns fail\n", __func__, GET_AH());
642	goto int13x_fail;
643	break;
644	}
645
646	int13x_fail:
647	SET_AH(0x01); // defaults to invalid function in AH or invalid parameter
648	int13x_fail_noah:
649	SET_DISK_RET_STATUS(GET_AH());
650	SET_CF(); // error occurred
651	return;
652
653	int13x_success:
654	SET_AH(0x00); // no error
655	int13x_success_noah:
656	SET_DISK_RET_STATUS(0x00);
657	CLEAR_CF(); // no error
658	return;
659	}
660
661	/* Avoid saving general registers already saved by caller (PUSHA). */
662	#pragma aux int13_harddisk modify [di si cx dx bx];
663	#pragma aux int13_harddisk_ext modify [di si cx dx bx];
664

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source: vbox/trunk/src/VBox/Devices/PC/BIOS/disk.c@ 78571

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