disk.c@ 82176

Last change on this file since 82176 was 82163, checked in by vboxsync, 5 years ago
PC/BIOS: Hook up VirtIO driver to the disk layer
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1	/* $Id: disk.c 82163 2019-11-25 10:31:53Z 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	#ifdef VBOX_WITH_VIRTIO_SCSI
94	[DSK_TYPE_VIRTIO_SCSI] = { virtio_scsi_read_sectors, virtio_scsi_write_sectors },
95	#endif
96	};
97
98
99	/// @todo put in a header
100	#define AX r.gr.u.r16.ax
101	#define BX r.gr.u.r16.bx
102	#define CX r.gr.u.r16.cx
103	#define DX r.gr.u.r16.dx
104	#define SI r.gr.u.r16.si
105	#define DI r.gr.u.r16.di
106	#define BP r.gr.u.r16.bp
107	#define ELDX r.gr.u.r16.sp
108	#define DS r.ds
109	#define ES r.es
110	#define FLAGS r.ra.flags.u.r16.flags
111
112
113	/*
114	* Build translated CHS geometry given a disk size in sectors. Based on
115	* Phoenix EDD 3.0. This is used as a fallback to generate sane logical
116	* geometry in case none was provided in CMOS.
117	*/
118	void set_geom_lba(chs_t __far *lgeo, uint64_t nsectors64)
119	{
120	uint32_t limit = 8257536; /* 1024 * 128 * 63 */
121	uint32_t nsectors;
122	unsigned heads = 255;
123	int i;
124
125	nsectors = (nsectors64 >> 32) ? 0xFFFFFFFFL : (uint32_t)nsectors64;
126	/* Start with ~4GB limit, go down to 504MB. */
127	for (i = 0; i < 4; ++i) {
128	if (nsectors <= limit)
129	heads = (heads + 1) / 2;
130	limit /= 2;
131	}
132
133	lgeo->cylinders = nsectors / (heads * 63UL);
134	if (lgeo->cylinders > 1024)
135	lgeo->cylinders = 1024;
136	lgeo->heads = heads;
137	lgeo->spt = 63; /* Always 63 sectors per track, the maximum. */
138	}
139
140	int edd_fill_dpt(dpt_t __far dpt, bio_dsk_t __far bios_dsk, uint8_t device)
141	{
142	uint16_t ebda_seg = read_word(0x0040,0x000E);
143
144	/* Check if buffer is large enough. */
145	if (dpt->size < 0x1a)
146	return -1;
147
148	/* Fill in EDD 1.x table. */
149	if (dpt->size >= 0x1a) {
150	uint64_t lba;
151
152	dpt->size = 0x1a;
153	dpt->blksize = bios_dsk->devices[device].blksize;
154
155	if (bios_dsk->devices[device].device == DSK_DEVICE_CDROM) {
156	dpt->infos = 0x74; /* Removable, media change, lockable, max values */
157	dpt->cylinders = 0xffffffff;
158	dpt->heads = 0xffffffff;
159	dpt->spt = 0xffffffff;
160	dpt->sector_count1 = 0xffffffff;
161	dpt->sector_count2 = 0xffffffff;
162	} else {
163	dpt->infos = 0x02; // geometry is valid
164	dpt->cylinders = bios_dsk->devices[device].pchs.cylinders;
165	dpt->heads = bios_dsk->devices[device].pchs.heads;
166	dpt->spt = bios_dsk->devices[device].pchs.spt;
167	lba = bios_dsk->devices[device].sectors;
168	dpt->sector_count1 = lba;
169	dpt->sector_count2 = lba >> 32;
170	}
171	}
172
173	/* Fill in EDD 2.x table. */
174	if (dpt->size >= 0x1e) {
175	uint8_t channel, irq, mode, checksum, i, xlation;
176	uint16_t iobase1, iobase2, options;
177
178	dpt->size = 0x1e;
179	dpt->dpte_segment = ebda_seg;
180	dpt->dpte_offset = (uint16_t)&EbdaData->bdisk.dpte;
181
182	// Fill in dpte
183	channel = device / 2;
184	iobase1 = bios_dsk->channels[channel].iobase1;
185	iobase2 = bios_dsk->channels[channel].iobase2;
186	irq = bios_dsk->channels[channel].irq;
187	mode = bios_dsk->devices[device].mode;
188	xlation = bios_dsk->devices[device].translation;
189
190	options = (xlation == GEO_TRANSLATION_NONE ? 0 : 1 << 3); /* CHS translation */
191	options \|= (1 << 4); /* LBA translation */
192	if (bios_dsk->devices[device].device == DSK_DEVICE_CDROM) {
193	options \|= (1 << 5); /* Removable device */
194	options \|= (1 << 6); /* ATAPI device */
195	}
196	#if VBOX_BIOS_CPU >= 80386
197	options \|= (mode == ATA_MODE_PIO32 ? 1 : 0 << 7);
198	#endif
199	options \|= (xlation == GEO_TRANSLATION_LBA ? 1 : 0 << 9);
200	options \|= (xlation == GEO_TRANSLATION_RECHS ? 3 : 0 << 9);
201
202	bios_dsk->dpte.iobase1 = iobase1;
203	bios_dsk->dpte.iobase2 = iobase2;
204	bios_dsk->dpte.prefix = (0xe \| (device % 2)) << 4;
205	bios_dsk->dpte.unused = 0xcb;
206	bios_dsk->dpte.irq = irq;
207	bios_dsk->dpte.blkcount = 1;
208	bios_dsk->dpte.dma = 0;
209	bios_dsk->dpte.pio = 0;
210	bios_dsk->dpte.options = options;
211	bios_dsk->dpte.reserved = 0;
212	bios_dsk->dpte.revision = 0x11;
213
214	checksum = 0;
215	for (i = 0; i < 15; ++i)
216	checksum += read_byte(ebda_seg, (uint16_t)&EbdaData->bdisk.dpte + i);
217	checksum = -checksum;
218	bios_dsk->dpte.checksum = checksum;
219	}
220
221	/* Fill in EDD 3.x table. */
222	if (dpt->size >= 0x42) {
223	uint8_t channel, iface, checksum, i;
224	uint16_t iobase1;
225
226	channel = device / 2;
227	iface = bios_dsk->channels[channel].iface;
228	iobase1 = bios_dsk->channels[channel].iobase1;
229
230	dpt->size = 0x42;
231	dpt->key = 0xbedd;
232	dpt->dpi_length = 0x24;
233	dpt->reserved1 = 0;
234	dpt->reserved2 = 0;
235
236	if (iface == ATA_IFACE_ISA) {
237	dpt->host_bus[0] = 'I';
238	dpt->host_bus[1] = 'S';
239	dpt->host_bus[2] = 'A';
240	dpt->host_bus[3] = ' ';
241	}
242	else {
243	// FIXME PCI
244	}
245	dpt->iface_type[0] = 'A';
246	dpt->iface_type[1] = 'T';
247	dpt->iface_type[2] = 'A';
248	dpt->iface_type[3] = ' ';
249	dpt->iface_type[4] = ' ';
250	dpt->iface_type[5] = ' ';
251	dpt->iface_type[6] = ' ';
252	dpt->iface_type[7] = ' ';
253
254	if (iface == ATA_IFACE_ISA) {
255	((uint16_t __far *)dpt->iface_path)[0] = iobase1;
256	((uint16_t __far *)dpt->iface_path)[1] = 0;
257	((uint32_t __far *)dpt->iface_path)[1] = 0;
258	}
259	else {
260	// FIXME PCI
261	}
262	((uint16_t __far *)dpt->device_path)[0] = device & 1; // device % 2; @todo: correct?
263	((uint16_t __far *)dpt->device_path)[1] = 0;
264	((uint32_t __far *)dpt->device_path)[1] = 0;
265
266	checksum = 0;
267	for (i = 30; i < 64; i++)
268	checksum += ((uint8_t __far *)dpt)[i];
269	checksum = -checksum;
270	dpt->checksum = checksum;
271	}
272	return 0;
273	}
274
275	void BIOSCALL int13_harddisk(disk_regs_t r)
276	{
277	uint32_t lba;
278	uint16_t cylinder, head, sector;
279	uint16_t nlc, nlh, nlspt;
280	uint16_t count;
281	uint8_t device, status;
282	bio_dsk_t __far *bios_dsk;
283
284	BX_DEBUG_INT13_HD("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", __func__, AX, BX, CX, DX, ES);
285
286	SET_IF(); /* INT 13h always returns with interrupts enabled. */
287
288	bios_dsk = read_word(0x0040,0x000E) :> &EbdaData->bdisk;
289	write_byte(0x0040, 0x008e, 0); // clear completion flag
290
291	// basic check : device has to be defined
292	if ( (GET_ELDL() < 0x80) \|\| (GET_ELDL() >= 0x80 + BX_MAX_STORAGE_DEVICES) ) {
293	BX_DEBUG("%s: function %02x, ELDL out of range %02x\n", __func__, GET_AH(), GET_ELDL());
294	goto int13_fail;
295	}
296
297	// Get the ata channel
298	device = bios_dsk->hdidmap[GET_ELDL()-0x80];
299
300	// basic check : device has to be valid
301	if (device >= BX_MAX_STORAGE_DEVICES) {
302	BX_DEBUG("%s: function %02x, unmapped device for ELDL=%02x\n", __func__, GET_AH(), GET_ELDL());
303	goto int13_fail;
304	}
305
306	switch (GET_AH()) {
307
308	case 0x00: /* disk controller reset */
309	#ifdef VBOX_WITH_SCSI
310	/* SCSI controller does not need a reset. */
311	if (!VBOX_IS_SCSI_DEVICE(device))
312	#endif
313	ata_reset (device);
314	goto int13_success;
315	break;
316
317	case 0x01: /* read disk status */
318	status = read_byte(0x0040, 0x0074);
319	SET_AH(status);
320	SET_DISK_RET_STATUS(0);
321	/* set CF if error status read */
322	if (status) goto int13_fail_nostatus;
323	else goto int13_success_noah;
324	break;
325
326	case 0x02: // read disk sectors
327	case 0x03: // write disk sectors
328	case 0x04: // verify disk sectors
329
330	count = GET_AL();
331	cylinder = GET_CH();
332	cylinder \|= ( ((uint16_t) GET_CL()) << 2) & 0x300;
333	sector = (GET_CL() & 0x3f);
334	head = GET_DH();
335
336	/* Segment and offset are in ES:BX. */
337	if ( (count > 128) \|\| (count == 0) ) {
338	BX_INFO("%s: function %02x, count out of range!\n", __func__, GET_AH());
339	goto int13_fail;
340	}
341
342	/* Get the logical CHS geometry. */
343	nlc = bios_dsk->devices[device].lchs.cylinders;
344	nlh = bios_dsk->devices[device].lchs.heads;
345	nlspt = bios_dsk->devices[device].lchs.spt;
346
347	/* Sanity check the geometry. */
348	if( (cylinder >= nlc) \|\| (head >= nlh) \|\| (sector > nlspt )) {
349	BX_INFO("%s: function %02x, disk %02x, parameters out of range %04x/%04x/%04x!\n", __func__, GET_AH(), GET_DL(), cylinder, head, sector);
350	goto int13_fail;
351	}
352
353	// FIXME verify
354	if ( GET_AH() == 0x04 )
355	goto int13_success;
356
357	/* If required, translate LCHS to LBA and execute command. */
358	/// @todo The IS_SCSI_DEVICE check should be redundant...
359	if (( (bios_dsk->devices[device].pchs.heads != nlh) \|\| (bios_dsk->devices[device].pchs.spt != nlspt)) \|\| VBOX_IS_SCSI_DEVICE(device)) {
360	lba = ((((uint32_t)cylinder * (uint32_t)nlh) + (uint32_t)head) * (uint32_t)nlspt) + (uint32_t)sector - 1;
361	sector = 0; // this forces the command to be lba
362	}
363
364	BX_DEBUG_INT13_HD("%s: %d sectors from lba %lu @ %04x:%04x\n", __func__,
365	count, lba, ES, BX);
366
367	/* Clear the count of transferred sectors/bytes. */
368	bios_dsk->drqp.trsfsectors = 0;
369	bios_dsk->drqp.trsfbytes = 0;
370
371	/* Pass request information to low level disk code. */
372	bios_dsk->drqp.lba = lba;
373	bios_dsk->drqp.buffer = MK_FP(ES, BX);
374	bios_dsk->drqp.nsect = count;
375	bios_dsk->drqp.sect_sz = 512; /// @todo device specific?
376	bios_dsk->drqp.cylinder = cylinder;
377	bios_dsk->drqp.head = head;
378	bios_dsk->drqp.sector = sector;
379	bios_dsk->drqp.dev_id = device;
380
381	status = dskacc[bios_dsk->devices[device].type].a[GET_AH() - 0x02](bios_dsk);
382
383	// Set nb of sector transferred
384	SET_AL(bios_dsk->drqp.trsfsectors);
385
386	if (status != 0) {
387	BX_INFO("%s: function %02x, error %02x !\n", __func__, GET_AH(), status);
388	SET_AH(0x0c);
389	goto int13_fail_noah;
390	}
391
392	goto int13_success;
393	break;
394
395	case 0x05: /* format disk track */
396	BX_INFO("format disk track called\n");
397	goto int13_success;
398	break;
399
400	case 0x08: /* read disk drive parameters */
401
402	/* Get the logical geometry from internal table. */
403	nlc = bios_dsk->devices[device].lchs.cylinders;
404	nlh = bios_dsk->devices[device].lchs.heads;
405	nlspt = bios_dsk->devices[device].lchs.spt;
406
407	count = bios_dsk->hdcount;
408	/* Maximum cylinder number is just one less than the number of cylinders. */
409	nlc = nlc - 1; /* 0 based , last sector not used */
410	SET_AL(0);
411	SET_CH(nlc & 0xff);
412	SET_CL(((nlc >> 2) & 0xc0) \| (nlspt & 0x3f));
413	SET_DH(nlh - 1);
414	SET_DL(count); /* FIXME returns 0, 1, or n hard drives */
415
416	// FIXME should set ES & DI
417	/// @todo Actually, the above comment is nonsense.
418
419	goto int13_success;
420	break;
421
422	case 0x10: /* check drive ready */
423	// should look at 40:8E also???
424
425	// Read the status from controller
426	status = inb(bios_dsk->channels[device/2].iobase1 + ATA_CB_STAT);
427	if ( (status & ( ATA_CB_STAT_BSY \| ATA_CB_STAT_RDY )) == ATA_CB_STAT_RDY ) {
428	goto int13_success;
429	} else {
430	SET_AH(0xAA);
431	goto int13_fail_noah;
432	}
433	break;
434
435	case 0x15: /* read disk drive size */
436
437	/* Get the physical geometry from internal table. */
438	cylinder = bios_dsk->devices[device].pchs.cylinders;
439	head = bios_dsk->devices[device].pchs.heads;
440	sector = bios_dsk->devices[device].pchs.spt;
441
442	/* Calculate sector count seen by old style INT 13h. */
443	lba = (uint32_t)cylinder * head * sector;
444	CX = lba >> 16;
445	DX = lba & 0xffff;
446
447	SET_AH(3); // hard disk accessible
448	goto int13_success_noah;
449	break;
450
451	case 0x09: /* initialize drive parameters */
452	case 0x0c: /* seek to specified cylinder */
453	case 0x0d: /* alternate disk reset */
454	case 0x11: /* recalibrate */
455	case 0x14: /* controller internal diagnostic */
456	BX_INFO("%s: function %02xh unimplemented, returns success\n", __func__, GET_AH());
457	goto int13_success;
458	break;
459
460	case 0x0a: /* read disk sectors with ECC */
461	case 0x0b: /* write disk sectors with ECC */
462	case 0x18: // set media type for format
463	default:
464	BX_INFO("%s: function %02xh unsupported, returns fail\n", __func__, GET_AH());
465	goto int13_fail;
466	break;
467	}
468
469	int13_fail:
470	SET_AH(0x01); // defaults to invalid function in AH or invalid parameter
471	int13_fail_noah:
472	SET_DISK_RET_STATUS(GET_AH());
473	int13_fail_nostatus:
474	SET_CF(); // error occurred
475	return;
476
477	int13_success:
478	SET_AH(0x00); // no error
479	int13_success_noah:
480	SET_DISK_RET_STATUS(0x00);
481	CLEAR_CF(); // no error
482	return;
483	}
484
485	void BIOSCALL int13_harddisk_ext(disk_regs_t r)
486	{
487	uint64_t lba;
488	uint16_t segment, offset;
489	uint8_t device, status;
490	uint16_t count;
491	uint8_t type;
492	bio_dsk_t __far *bios_dsk;
493	int13ext_t __far *i13_ext;
494	#if 0
495	uint16_t ebda_seg = read_word(0x0040,0x000E);
496	uint16_t npc, nph, npspt;
497	uint16_t size;
498	dpt_t __far *dpt;
499	#endif
500
501	bios_dsk = read_word(0x0040,0x000E) :> &EbdaData->bdisk;
502
503	BX_DEBUG_INT13_HD("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x DS=%04x SI=%04x\n",
504	__func__, AX, BX, CX, DX, ES, DS, SI);
505
506	write_byte(0x0040, 0x008e, 0); // clear completion flag
507
508	// basic check : device has to be defined
509	if ( (GET_ELDL() < 0x80) \|\| (GET_ELDL() >= 0x80 + BX_MAX_STORAGE_DEVICES) ) {
510	BX_DEBUG("%s: function %02x, ELDL out of range %02x\n", __func__, GET_AH(), GET_ELDL());
511	goto int13x_fail;
512	}
513
514	// Get the ata channel
515	device = bios_dsk->hdidmap[GET_ELDL()-0x80];
516
517	// basic check : device has to be valid
518	if (device >= BX_MAX_STORAGE_DEVICES) {
519	BX_DEBUG("%s: function %02x, unmapped device for ELDL=%02x\n", __func__, GET_AH(), GET_ELDL());
520	goto int13x_fail;
521	}
522
523	switch (GET_AH()) {
524	case 0x41: // IBM/MS installation check
525	BX=0xaa55; // install check
526	SET_AH(0x30); // EDD 3.0
527	CX=0x0007; // ext disk access and edd, removable supported
528	goto int13x_success_noah;
529	break;
530
531	case 0x42: // IBM/MS extended read
532	case 0x43: // IBM/MS extended write
533	case 0x44: // IBM/MS verify
534	case 0x47: // IBM/MS extended seek
535
536	/* Get a pointer to the extended structure. */
537	i13_ext = DS :> (int13ext_t *)SI;
538
539	count = i13_ext->count;
540	segment = i13_ext->segment;
541	offset = i13_ext->offset;
542
543	// Get 64 bits lba and check
544	lba = i13_ext->lba2;
545	lba <<= 32;
546	lba \|= i13_ext->lba1;
547
548	BX_DEBUG_INT13_HD("%s: %d sectors from LBA 0x%llx @ %04x:%04x\n", __func__,
549	count, lba, segment, offset);
550
551	type = bios_dsk->devices[device].type;
552	if (lba >= bios_dsk->devices[device].sectors) {
553	BX_INFO("%s: function %02x. LBA out of range\n", __func__, GET_AH());
554	goto int13x_fail;
555	}
556
557	/* Don't bother with seek or verify. */
558	if (( GET_AH() == 0x44 ) \|\| ( GET_AH() == 0x47 ))
559	goto int13x_success;
560
561	/* Clear the count of transferred sectors/bytes. */
562	bios_dsk->drqp.trsfsectors = 0;
563	bios_dsk->drqp.trsfbytes = 0;
564
565	/* Pass request information to low level disk code. */
566	bios_dsk->drqp.lba = lba;
567	bios_dsk->drqp.buffer = MK_FP(segment, offset);
568	bios_dsk->drqp.nsect = count;
569	bios_dsk->drqp.sect_sz = 512; /// @todo device specific?
570	bios_dsk->drqp.sector = 0; /* Indicate LBA. */
571	bios_dsk->drqp.dev_id = device;
572
573	/* Execute the read or write command. */
574	status = dskacc[type].a[GET_AH() - 0x42](bios_dsk);
575	count = bios_dsk->drqp.trsfsectors;
576	i13_ext->count = count;
577
578	if (status != 0) {
579	BX_INFO("%s: function %02x, error %02x !\n", __func__, GET_AH(), status);
580	SET_AH(0x0c);
581	goto int13x_fail_noah;
582	}
583
584	goto int13x_success;
585	break;
586
587	case 0x45: // IBM/MS lock/unlock drive
588	case 0x49: // IBM/MS extended media change
589	goto int13x_success; // Always success for HD
590	break;
591
592	case 0x46: // IBM/MS eject media
593	SET_AH(0xb2); // Volume Not Removable
594	goto int13x_fail_noah; // Always fail for HD
595	break;
596
597	case 0x48: // IBM/MS get drive parameters
598	if (edd_fill_dpt(DS :> (dpt_t *)SI, bios_dsk, device))
599	goto int13x_fail;
600	else
601	goto int13x_success;
602	break;
603
604	case 0x4e: // // IBM/MS set hardware configuration
605	// DMA, prefetch, PIO maximum not supported
606	switch (GET_AL()) {
607	case 0x01:
608	case 0x03:
609	case 0x04:
610	case 0x06:
611	goto int13x_success;
612	break;
613	default :
614	goto int13x_fail;
615	}
616	break;
617
618	case 0x50: // IBM/MS send packet command
619	default:
620	BX_INFO("%s: function %02xh unsupported, returns fail\n", __func__, GET_AH());
621	goto int13x_fail;
622	break;
623	}
624
625	int13x_fail:
626	SET_AH(0x01); // defaults to invalid function in AH or invalid parameter
627	int13x_fail_noah:
628	SET_DISK_RET_STATUS(GET_AH());
629	SET_CF(); // error occurred
630	return;
631
632	int13x_success:
633	SET_AH(0x00); // no error
634	int13x_success_noah:
635	SET_DISK_RET_STATUS(0x00);
636	CLEAR_CF(); // no error
637	return;
638	}
639
640	/* Avoid saving general registers already saved by caller (PUSHA). */
641	#pragma aux int13_harddisk modify [di si cx dx bx];
642	#pragma aux int13_harddisk_ext modify [di si cx dx bx];
643

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source: vbox/trunk/src/VBox/Devices/PC/BIOS/disk.c@ 82176

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