ata.c@ 92290

Last change on this file since 92290 was 92290, checked in by vboxsync, 3 years ago
BIOS: Use get_cmos_word in other places where we read two adjacent cmos values and combine them into a 16-bit word. Saves 128 bytes. bugref:6549
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1	/* $Id: ata.c 92290 2021-11-09 12:49:35Z vboxsync $ */
2	/** @file
3	* PC BIOS - ATA disk support.
4	*/
5
6	/*
7	* Copyright (C) 2006-2020 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 <stdarg.h>
58	#include "inlines.h"
59	#include "biosint.h"
60	#include "ebda.h"
61	#include "ata.h"
62	#include "pciutil.h"
63
64
65	#if DEBUG_ATA
66	# define BX_DEBUG_ATA(...) BX_DEBUG(__VA_ARGS__)
67	#else
68	# define BX_DEBUG_ATA(...)
69	#endif
70
71
72	// ---------------------------------------------------------------------------
73	// Start of ATA/ATAPI Driver
74	// ---------------------------------------------------------------------------
75
76	// ---------------------------------------------------------------------------
77	// ATA/ATAPI driver : initialization
78	// ---------------------------------------------------------------------------
79	void BIOSCALL ata_init(void)
80	{
81	uint8_t channel, device;
82	bio_dsk_t __far *bios_dsk;
83
84	bios_dsk = read_word(0x0040, 0x000E) :> &EbdaData->bdisk;
85
86	// Channels info init.
87	for (channel=0; channel<BX_MAX_ATA_INTERFACES; channel++) {
88	bios_dsk->channels[channel].iface = ATA_IFACE_NONE;
89	bios_dsk->channels[channel].iobase1 = 0x0;
90	bios_dsk->channels[channel].iobase2 = 0x0;
91	bios_dsk->channels[channel].irq = 0;
92	}
93
94	// Devices info init.
95	for (device=0; device<BX_MAX_ATA_DEVICES; device++) {
96	bios_dsk->devices[device].type = DSK_TYPE_NONE;
97	bios_dsk->devices[device].device = DSK_DEVICE_NONE;
98	bios_dsk->devices[device].removable = 0;
99	bios_dsk->devices[device].lock = 0;
100	bios_dsk->devices[device].mode = ATA_MODE_NONE;
101	bios_dsk->devices[device].blksize = 0x200;
102	bios_dsk->devices[device].translation = GEO_TRANSLATION_NONE;
103	bios_dsk->devices[device].lchs.heads = 0;
104	bios_dsk->devices[device].lchs.cylinders = 0;
105	bios_dsk->devices[device].lchs.spt = 0;
106	bios_dsk->devices[device].pchs.heads = 0;
107	bios_dsk->devices[device].pchs.cylinders = 0;
108	bios_dsk->devices[device].pchs.spt = 0;
109	bios_dsk->devices[device].sectors = 0;
110	}
111
112	// hdidmap and cdidmap init.
113	for (device=0; device<BX_MAX_STORAGE_DEVICES; device++) {
114	bios_dsk->hdidmap[device] = BX_MAX_STORAGE_DEVICES;
115	bios_dsk->cdidmap[device] = BX_MAX_STORAGE_DEVICES;
116	}
117
118	bios_dsk->hdcount = 0;
119	bios_dsk->cdcount = 0;
120	}
121
122	// ---------------------------------------------------------------------------
123	// ATA/ATAPI driver : software reset
124	// ---------------------------------------------------------------------------
125	// ATA-3
126	// 8.2.1 Software reset - Device 0
127
128	void ata_reset(uint16_t device)
129	{
130	uint16_t iobase1, iobase2;
131	uint8_t channel, slave, sn, sc;
132	uint16_t max;
133	uint16_t pdelay;
134	bio_dsk_t __far *bios_dsk;
135
136	bios_dsk = read_word(0x0040, 0x000E) :> &EbdaData->bdisk;
137	channel = device / 2;
138	slave = device % 2;
139
140	iobase1 = bios_dsk->channels[channel].iobase1;
141	iobase2 = bios_dsk->channels[channel].iobase2;
142
143	// Reset
144
145	// 8.2.1 (a) -- set SRST in DC
146	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15 \| ATA_CB_DC_NIEN \| ATA_CB_DC_SRST);
147
148	// 8.2.1 (b) -- wait for BSY
149	max=0xff;
150	while(--max>0) {
151	uint8_t status = inb(iobase1+ATA_CB_STAT);
152	if ((status & ATA_CB_STAT_BSY) != 0)
153	break;
154	}
155
156	// 8.2.1 (f) -- clear SRST
157	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15 \| ATA_CB_DC_NIEN);
158
159	// 8.2.1 (h) -- wait for not BSY
160	max=0xffff; /* The ATA specification says that the drive may be busy for up to 30 seconds. */
161	while(--max>0) {
162	uint8_t status = inb(iobase1+ATA_CB_STAT);
163	if ((status & ATA_CB_STAT_BSY) == 0)
164	break;
165	pdelay=0xffff;
166	while (--pdelay>0) {
167	/* nothing */
168	}
169	}
170
171	if (bios_dsk->devices[device].type != DSK_TYPE_NONE) {
172	// 8.2.1 (g) -- check for sc==sn==0x01
173	// select device
174	outb(iobase1+ATA_CB_DH, slave?ATA_CB_DH_DEV1:ATA_CB_DH_DEV0);
175	sc = inb(iobase1+ATA_CB_SC);
176	sn = inb(iobase1+ATA_CB_SN);
177
178	if ( (sc==0x01) && (sn==0x01) ) {
179	// 8.2.1 (i) -- wait for DRDY
180	max = 0x10; /* Speed up for virtual drives. Disks are immediately ready, CDs never */
181	while(--max>0) {
182	uint8_t status = inb(iobase1+ATA_CB_STAT);
183	if ((status & ATA_CB_STAT_RDY) != 0)
184	break;
185	}
186	}
187	}
188
189	// Enable interrupts
190	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
191	}
192
193	// ---------------------------------------------------------------------------
194	// ATA/ATAPI driver : execute a data-in command
195	// ---------------------------------------------------------------------------
196	// returns
197	// 0 : no error
198	// 1 : BUSY bit set
199	// 2 : read error
200	// 3 : expected DRQ=1
201	// 4 : no sectors left to read/verify
202	// 5 : more sectors to read/verify
203	// 6 : no sectors left to write
204	// 7 : more sectors to write
205	uint16_t ata_cmd_data_in(bio_dsk_t __far *bios_dsk, uint16_t command, uint16_t count)
206	{
207	uint16_t iobase1, iobase2, blksize, mult_blk_cnt;
208	uint16_t cylinder;
209	uint8_t head;
210	uint8_t sector;
211	uint8_t device;
212	uint8_t status, mode;
213	char __far *buffer;
214
215	device = bios_dsk->drqp.dev_id;
216
217	iobase1 = bios_dsk->channels[device / 2].iobase1;
218	iobase2 = bios_dsk->channels[device / 2].iobase2;
219	mode = bios_dsk->devices[device].mode;
220	blksize = bios_dsk->devices[device].blksize;
221	if (blksize == 0) { /* If transfer size is exactly 64K */
222	#if VBOX_BIOS_CPU >= 80386
223	if (mode == ATA_MODE_PIO32)
224	blksize = 0x4000;
225	else
226	#endif
227	blksize = 0x8000;
228	} else {
229	#if VBOX_BIOS_CPU >= 80386
230	if (mode == ATA_MODE_PIO32)
231	blksize >>= 2;
232	else
233	#endif
234	blksize >>= 1;
235	}
236
237	status = inb(iobase1 + ATA_CB_STAT);
238	if (status & ATA_CB_STAT_BSY)
239	{
240	BX_DEBUG_ATA("%s: disk busy\n", __func__);
241	// Enable interrupts
242	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
243	return 1;
244	}
245
246	buffer = bios_dsk->drqp.buffer;
247	sector = bios_dsk->drqp.sector;
248	cylinder = bios_dsk->drqp.cylinder;
249	head = bios_dsk->drqp.head;
250
251	// sector will be 0 only on lba access. Convert to lba-chs
252	if (sector == 0) {
253	if (bios_dsk->drqp.lba + count >= 268435456)
254	{
255	sector = (bios_dsk->drqp.lba >> 24) & 0x00ff;
256	cylinder = (bios_dsk->drqp.lba >> 32) & 0xffff;
257	outb(iobase1 + ATA_CB_SC, (count & 0xff00) >> 8);
258	outb(iobase1 + ATA_CB_SN, sector);
259	outb(iobase1 + ATA_CB_CL, cylinder & 0x00ff);
260	outb(iobase1 + ATA_CB_CH, cylinder >> 8);
261	/* Leave the bottom 24 bits as is, they are treated correctly by the
262	* LBA28 code path. */
263	}
264	sector = bios_dsk->drqp.lba & 0x000000ffL;
265	cylinder = (bios_dsk->drqp.lba >> 8) & 0x0000ffffL;
266	head = ((bios_dsk->drqp.lba >> 24) & 0x0000000fL) \| 0x40;
267	}
268
269	outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 \| ATA_CB_DC_NIEN);
270	outb(iobase1 + ATA_CB_FR, 0x00);
271	outb(iobase1 + ATA_CB_SC, count);
272	outb(iobase1 + ATA_CB_SN, sector);
273	outb(iobase1 + ATA_CB_CL, cylinder & 0x00ff);
274	outb(iobase1 + ATA_CB_CH, cylinder >> 8);
275	outb(iobase1 + ATA_CB_DH, ((device & 1) ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0) \| head );
276	outb(iobase1 + ATA_CB_CMD, command);
277
278	if (command == ATA_CMD_READ_MULTIPLE \|\| command == ATA_CMD_READ_MULTIPLE_EXT) {
279	mult_blk_cnt = count;
280	count = 1;
281	} else {
282	mult_blk_cnt = 1;
283	}
284
285	while (1) {
286	status = inb(iobase1 + ATA_CB_STAT);
287	if ( !(status & ATA_CB_STAT_BSY) )
288	break;
289	}
290
291	if (status & ATA_CB_STAT_ERR) {
292	BX_DEBUG_ATA("%s: read error\n", __func__);
293	// Enable interrupts
294	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
295	return 2;
296	} else if ( !(status & ATA_CB_STAT_DRQ) ) {
297	BX_DEBUG_ATA("%s: DRQ not set (status %02x)\n", __func__, (unsigned) status);
298	// Enable interrupts
299	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
300	return 3;
301	}
302
303	// FIXME : move seg/off translation here
304
305	int_enable(); // enable higher priority interrupts
306
307	while (1) {
308
309	// adjust if there will be an overrun. 2K max sector size
310	if (FP_OFF(buffer) >= 0xF800)
311	buffer = MK_FP(FP_SEG(buffer) + 0x80, FP_OFF(buffer) - 0x800);
312
313	#if VBOX_BIOS_CPU >= 80386
314	if (mode == ATA_MODE_PIO32)
315	buffer = rep_insd(buffer, blksize, iobase1);
316	else
317	#endif
318	buffer = rep_insw(buffer, blksize, iobase1);
319	bios_dsk->drqp.trsfsectors += mult_blk_cnt;
320	count--;
321	while (1) {
322	status = inb(iobase1 + ATA_CB_STAT);
323	if ( !(status & ATA_CB_STAT_BSY) )
324	break;
325	}
326	if (count == 0) {
327	if ( (status & (ATA_CB_STAT_BSY \| ATA_CB_STAT_RDY \| ATA_CB_STAT_DRQ \| ATA_CB_STAT_ERR) )
328	!= ATA_CB_STAT_RDY ) {
329	BX_DEBUG_ATA("%s: no sectors left (status %02x)\n", __func__, (unsigned) status);
330	// Enable interrupts
331	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
332	return 4;
333	}
334	break;
335	}
336	else {
337	if ( (status & (ATA_CB_STAT_BSY \| ATA_CB_STAT_RDY \| ATA_CB_STAT_DRQ \| ATA_CB_STAT_ERR) )
338	!= (ATA_CB_STAT_RDY \| ATA_CB_STAT_DRQ) ) {
339	BX_DEBUG_ATA("%s: more sectors left (status %02x)\n", __func__, (unsigned) status);
340	// Enable interrupts
341	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
342	return 5;
343	}
344	continue;
345	}
346	}
347	// Enable interrupts
348	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
349	return 0;
350	}
351
352	// ---------------------------------------------------------------------------
353	// ATA/ATAPI driver : device detection
354	// ---------------------------------------------------------------------------
355
356	int ata_signature(uint16_t iobase1, uint8_t channel, uint8_t slave)
357	{
358	int dsk_type = DSK_TYPE_NONE;
359	uint8_t sc, sn, st, cl, ch;
360
361	/*
362	* Wait for BSY=0 so that the signature can be read. We already determined that
363	* an ATA interface is present, and rely on the fact that for non-existent
364	* devices, the BSY bit will always be clear.
365	*/
366	outb(iobase1+ATA_CB_DH, slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0);
367	do {
368	st = inb(iobase1+ATA_CB_STAT);
369	} while (st & ATA_CB_STAT_BSY);
370
371	/*
372	* Look for ATA/ATAPI signature. Fun Fact #1: If there's a Device 1 but no
373	* Device 0, Device 1 can't tell and does not respond for it. Accessing
374	* non-existent Device 0 behaves the same regardless of whether Device 1
375	* is present or not.
376	*/
377	sc = inb(iobase1+ATA_CB_SC);
378	sn = inb(iobase1+ATA_CB_SN);
379	if ((sc == 1) && (sn == 1)) {
380	cl = inb(iobase1+ATA_CB_CL);
381	ch = inb(iobase1+ATA_CB_CH);
382
383	/*
384	* Fun fact #2: If Device 0 responds for Device 1, an ATA device generally
385	* returns the values of its own registers, while an ATAPI device returns
386	* zeros. In both cases, the Status register is read as zero.
387	*/
388	if ((cl == 0x14) && (ch == 0xEB)) {
389	dsk_type = DSK_TYPE_ATAPI;
390	BX_DEBUG_ATA("ata%d-%d: ATAPI device\n", channel, slave);
391	} else if ((cl == 0) && (ch == 0)) {
392	if (st != 0) {
393	dsk_type = DSK_TYPE_ATA;
394	BX_DEBUG_ATA("ata%d-%d: ATA device\n", channel, slave);
395	} else {
396	BX_DEBUG_ATA("ata%d-%d: ATA master responding for slave\n", channel, slave);
397	}
398	} else {
399	dsk_type = DSK_TYPE_UNKNOWN;
400	BX_DEBUG_ATA("ata%d-%d: something else (%02X/%02X/%02X)\n", channel, slave, cl, ch, st);
401	}
402	} else /* Possibly ATAPI Device 0 responding for Device 1. */
403	BX_DEBUG_ATA("ata%d-%d: bad sc/sn signature (%02X/%02X)\n", channel, slave, sc, sn);
404
405	return dsk_type;
406	}
407
408	void BIOSCALL ata_detect(void)
409	{
410	uint16_t ebda_seg = read_word(0x0040,0x000E);
411	uint8_t hdcount, cdcount, device, type;
412	uint8_t buffer[0x0200];
413	bio_dsk_t __far *bios_dsk;
414
415	/* If we have PCI support, look for an IDE controller (it has to be a PCI device)
416	* so that we can skip silly probing. If there's no PCI, assume IDE is present.
417	*
418	* Needs an internal PCI function because the Programming Interface byte can be
419	* almost anything, and we conly care about the base-class and sub-class code.
420	*/
421	#if VBOX_BIOS_CPU >= 80386
422	uint16_t busdevfn;
423
424	busdevfn = pci_find_class_noif(0x0101);
425	if (busdevfn == 0xffff) {
426	BX_INFO("No PCI IDE controller, not probing IDE\n");
427	return;
428	}
429	#endif
430
431	bios_dsk = ebda_seg :> &EbdaData->bdisk;
432
433	#if BX_MAX_ATA_INTERFACES > 0
434	bios_dsk->channels[0].iface = ATA_IFACE_ISA;
435	bios_dsk->channels[0].iobase1 = 0x1f0;
436	bios_dsk->channels[0].iobase2 = 0x3f0;
437	bios_dsk->channels[0].irq = 14;
438	#endif
439	#if BX_MAX_ATA_INTERFACES > 1
440	bios_dsk->channels[1].iface = ATA_IFACE_ISA;
441	bios_dsk->channels[1].iobase1 = 0x170;
442	bios_dsk->channels[1].iobase2 = 0x370;
443	bios_dsk->channels[1].irq = 15;
444	#endif
445	#if BX_MAX_ATA_INTERFACES > 2
446	bios_dsk->channels[2].iface = ATA_IFACE_ISA;
447	bios_dsk->channels[2].iobase1 = 0x1e8;
448	bios_dsk->channels[2].iobase2 = 0x3e0;
449	bios_dsk->channels[2].irq = 12;
450	#endif
451	#if BX_MAX_ATA_INTERFACES > 3
452	bios_dsk->channels[3].iface = ATA_IFACE_ISA;
453	bios_dsk->channels[3].iobase1 = 0x168;
454	bios_dsk->channels[3].iobase2 = 0x360;
455	bios_dsk->channels[3].irq = 11;
456	#endif
457	#if BX_MAX_ATA_INTERFACES > 4
458	#error Please fill the ATA interface information
459	#endif
460
461	// Device detection
462	hdcount = cdcount = 0;
463
464	for (device = 0; device < BX_MAX_ATA_DEVICES; device++) {
465	uint16_t iobase1, iobase2;
466	uint16_t retries;
467	uint8_t channel, slave;
468	uint8_t st;
469
470	channel = device / 2;
471	slave = device % 2;
472
473	iobase1 = bios_dsk->channels[channel].iobase1;
474	iobase2 = bios_dsk->channels[channel].iobase2;
475
476	/*
477	* Here we are in a tricky situation. We do not know if an ATA
478	* interface is even present at a given address. If it is present,
479	* we don't know if a device is present. We also need to consider
480	* the case of only a slave device being present, which does not
481	* respond for the missing master device. If a device is present,
482	* it may be still powering up or processing reset, which means it
483	* may be busy.
484	*
485	* If a device is busy, we can't reliably write any registers, and
486	* reads will return the Status register. If the Status register
487	* value is 0FFh, there might be no ATA controller at all, or it
488	* might be a busy drive. Fortunately we know that our own devices
489	* never return such a value when busy, and we use that knowledge
490	* to detect non-existent interfaces.
491	*
492	* We also know that our ATA interface will not return 0FFh even when
493	* no device is present on a given channel. This knowledge is handy
494	* when only a slave device exists because we won't read 0FFh and
495	* think there is no ATA interface at all.
496	*/
497
498	st = inb(iobase1+ATA_CB_STAT);
499	BX_DEBUG_ATA("ata%d-%d: Status=%02X\n", channel, slave, st);
500	if (st == 0xff)
501	continue;
502
503	/*
504	* Perform a software reset by setting and clearing the SRST bit. This
505	* can be done at any time, and forces device signature into the task file
506	* registers. If present, both devices are reset at once, so we only do
507	* this once per channel.
508	*/
509	if (!slave) {
510	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15 \| ATA_CB_DC_NIEN \| ATA_CB_DC_SRST);
511
512	/*
513	* Ensure reasonable SRST pulse width, but do not wait long for
514	* non-existent devices.
515	*/
516	retries = 32;
517	while (--retries > 0) {
518	st = inb(iobase1+ATA_CB_STAT);
519	if (st & ATA_CB_STAT_BSY)
520	break;
521	}
522
523	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15 \| ATA_CB_DC_NIEN);
524
525	/* After reset, device signature will be placed in registers. But
526	* executing any commands will overwrite it for Device 1. So that
527	* we don't have to reset twice, look for both Device 0 and Device 1
528	* signatures here right after reset.
529	*/
530	bios_dsk->devices[device + 0].type = ata_signature(iobase1, channel, 0);
531	bios_dsk->devices[device + 1].type = ata_signature(iobase1, channel, 1);
532	}
533
534	// Enable interrupts
535	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
536
537	type = bios_dsk->devices[device].type;
538
539	// Now we send a IDENTIFY command to ATA device
540	if (type == DSK_TYPE_ATA) {
541	uint64_t sectors;
542	uint16_t cylinders, heads, spt, blksize;
543	chs_t lgeo;
544	uint8_t chsgeo_base;
545	uint8_t removable, mode;
546
547	//Temporary values to do the transfer
548	bios_dsk->devices[device].device = DSK_DEVICE_HD;
549	bios_dsk->devices[device].mode = ATA_MODE_PIO16;
550	bios_dsk->drqp.buffer = buffer;
551	bios_dsk->drqp.dev_id = device;
552
553	if (ata_cmd_data_in(bios_dsk, ATA_CMD_IDENTIFY_DEVICE, 1) !=0 )
554	BX_PANIC("ata-detect: Failed to detect ATA device\n");
555
556	removable = (*(buffer+0) & 0x80) ? 1 : 0;
557	#if VBOX_BIOS_CPU >= 80386
558	mode = *(buffer+96) ? ATA_MODE_PIO32 : ATA_MODE_PIO16;
559	#else
560	mode = ATA_MODE_PIO16;
561	#endif
562	blksize = 512; /* There is no sector size field any more. */
563
564	cylinders = (uint16_t )(buffer+(1*2)); // word 1
565	heads = (uint16_t )(buffer+(3*2)); // word 3
566	spt = (uint16_t )(buffer+(6*2)); // word 6
567
568	sectors = (uint32_t )(buffer+(60*2)); // word 60 and word 61
569	if (sectors == 0x0FFFFFFF) /* For disks bigger than ~128GB */
570	sectors = (uint64_t )(buffer+(100*2)); // words 100 to 103
571	switch (device)
572	{
573	case 0:
574	chsgeo_base = 0x1e;
575	break;
576	case 1:
577	chsgeo_base = 0x26;
578	break;
579	case 2:
580	chsgeo_base = 0x67;
581	break;
582	case 3:
583	chsgeo_base = 0x70;
584	break;
585	default:
586	chsgeo_base = 0;
587	}
588	if (chsgeo_base)
589	{
590	lgeo.cylinders = get_cmos_word(chsgeo_base /, chsgeo_base + 1/);
591	lgeo.heads = inb_cmos(chsgeo_base + 2);
592	lgeo.spt = inb_cmos(chsgeo_base + 7);
593	}
594	else
595	set_geom_lba(&lgeo, sectors); /* Default EDD-style translated LBA geometry. */
596
597	BX_INFO("ata%d-%d: PCHS=%u/%u/%u LCHS=%u/%u/%u\n", channel, slave,
598	cylinders, heads, spt, lgeo.cylinders, lgeo.heads, lgeo.spt);
599
600	bios_dsk->devices[device].device = DSK_DEVICE_HD;
601	bios_dsk->devices[device].removable = removable;
602	bios_dsk->devices[device].mode = mode;
603	bios_dsk->devices[device].blksize = blksize;
604	bios_dsk->devices[device].pchs.heads = heads;
605	bios_dsk->devices[device].pchs.cylinders = cylinders;
606	bios_dsk->devices[device].pchs.spt = spt;
607	bios_dsk->devices[device].sectors = sectors;
608	bios_dsk->devices[device].lchs = lgeo;
609	if (device < 2)
610	{
611	uint8_t sum, i;
612	fdpt_t __far *fdpt;
613	void __far * __far *int_vec;
614
615	if (device == 0)
616	fdpt = ebda_seg :> &EbdaData->fdpt0;
617	else
618	fdpt = ebda_seg :> &EbdaData->fdpt1;
619
620	#if 0
621	/* Place the FDPT outside of conventional memory. Needed for
622	* 286 XENIX 2.1.3/2.2.1 because it completely wipes out
623	* the EBDA and low memory. Hack!
624	*/
625	fdpt = MK_FP(0xE200, 0xf00);
626	fdpt += device;
627	#endif
628
629	/* Set the INT 41h or 46h pointer. */
630	int_vec = MK_FP(0, (0x41 + device * 5) * sizeof(void __far *));
631	*int_vec = fdpt;
632
633	/* Update the DPT for drive 0/1 pointed to by Int41/46. This used
634	* to be done at POST time with lots of ugly assembler code, which
635	* isn't worth the effort of converting from AMI to Award CMOS
636	* format. Just do it here. */
637	fdpt->resvd1 = fdpt->resvd2 = 0;
638
639	fdpt->lcyl = lgeo.cylinders;
640	fdpt->lhead = lgeo.heads;
641	fdpt->sig = 0xa0;
642	fdpt->spt = spt;
643	fdpt->cyl = cylinders;
644	fdpt->head = heads;
645	fdpt->lspt = lgeo.spt;
646	sum = 0;
647	for (i = 0; i < 0xf; i++)
648	sum += ((uint8_t __far )fdpt + i);
649	sum = -sum;
650	fdpt->csum = sum;
651	}
652
653	// fill hdidmap
654	bios_dsk->hdidmap[hdcount] = device;
655	hdcount++;
656	}
657
658	// Now we send an IDENTIFY command to ATAPI device
659	if (type == DSK_TYPE_ATAPI) {
660	uint8_t type, removable, mode;
661	uint16_t blksize;
662
663	// Temporary values to do the transfer
664	bios_dsk->devices[device].device = DSK_DEVICE_CDROM;
665	bios_dsk->devices[device].mode = ATA_MODE_PIO16;
666	bios_dsk->drqp.buffer = buffer;
667	bios_dsk->drqp.dev_id = device;
668
669	if (ata_cmd_data_in(bios_dsk, ATA_CMD_IDENTIFY_PACKET, 1) != 0)
670	BX_PANIC("ata-detect: Failed to detect ATAPI device\n");
671
672	type = *(buffer+1) & 0x1f;
673	removable = (*(buffer+0) & 0x80) ? 1 : 0;
674	#if VBOX_BIOS_CPU >= 80386
675	mode = *(buffer+96) ? ATA_MODE_PIO32 : ATA_MODE_PIO16;
676	#else
677	mode = ATA_MODE_PIO16;
678	#endif
679	blksize = 2048;
680
681	bios_dsk->devices[device].device = type;
682	bios_dsk->devices[device].removable = removable;
683	bios_dsk->devices[device].mode = mode;
684	bios_dsk->devices[device].blksize = blksize;
685
686	// fill cdidmap
687	bios_dsk->cdidmap[cdcount] = device;
688	cdcount++;
689	}
690
691	{
692	uint32_t sizeinmb;
693	uint16_t ataversion;
694	uint8_t version, model[41];
695	int i;
696
697	switch (type) {
698	case DSK_TYPE_ATA:
699	sizeinmb = (bios_dsk->devices[device].sectors >> 11);
700	case DSK_TYPE_ATAPI:
701	// Read ATA/ATAPI version
702	ataversion = ((uint16_t)((buffer+161))<<8) \| (buffer+160);
703	for (version = 15; version > 0; version--) {
704	if ((ataversion & (1 << version)) !=0 )
705	break;
706	}
707
708	// Read model name
709	for (i = 0; i < 20; i++ ) {
710	(model+(i2)) = (buffer+(i2)+54+1);
711	(model+(i2)+1) = (buffer+(i2)+54);
712	}
713
714	// Reformat
715	*(model+40) = 0x00;
716	for ( i = 39; i > 0; i-- ){
717	if (*(model+i) == 0x20)
718	*(model+i) = 0x00;
719	else
720	break;
721	}
722	break;
723	}
724
725	#ifdef VBOXz
726	// we don't want any noisy output for now
727	#else /* !VBOX */
728	switch (type) {
729	int c;
730	case DSK_TYPE_ATA:
731	printf("ata%d %s: ", channel, slave ? " slave" : "master");
732	i=0;
733	while(c=*(model+i++))
734	printf("%c", c);
735	printf(" ATA-%d Hard-Disk (%lu MBytes)\n", version, sizeinmb);
736	break;
737	case DSK_TYPE_ATAPI:
738	printf("ata%d %s: ", channel, slave ? " slave" : "master");
739	i=0;
740	while(c=*(model+i++))
741	printf("%c", c);
742	if (bios_dsk->devices[device].device == DSK_DEVICE_CDROM)
743	printf(" ATAPI-%d CD-ROM/DVD-ROM\n", version);
744	else
745	printf(" ATAPI-%d Device\n", version);
746	break;
747	case DSK_TYPE_UNKNOWN:
748	printf("ata%d %s: Unknown device\n", channel , slave ? " slave" : "master");
749	break;
750	}
751	#endif /* !VBOX */
752	}
753	}
754
755	// Store the devices counts
756	bios_dsk->hdcount = hdcount;
757	bios_dsk->cdcount = cdcount;
758	write_byte(0x40,0x75, hdcount);
759
760	#ifdef VBOX
761	// we don't want any noisy output for now
762	#else /* !VBOX */
763	printf("\n");
764	#endif /* !VBOX */
765
766	// FIXME : should use bios=cmos\|auto\|disable bits
767	// FIXME : should know about translation bits
768	// FIXME : move hard_drive_post here
769
770	}
771
772	// ---------------------------------------------------------------------------
773	// ATA/ATAPI driver : execute a data-out command
774	// ---------------------------------------------------------------------------
775	// returns
776	// 0 : no error
777	// 1 : BUSY bit set
778	// 2 : read error
779	// 3 : expected DRQ=1
780	// 4 : no sectors left to read/verify
781	// 5 : more sectors to read/verify
782	// 6 : no sectors left to write
783	// 7 : more sectors to write
784	uint16_t ata_cmd_data_out(bio_dsk_t __far *bios_dsk, uint16_t command, uint16_t count)
785	{
786	uint64_t lba;
787	char __far *buffer;
788	uint16_t iobase1, iobase2, blksize;
789	uint16_t cylinder;
790	uint16_t head;
791	uint16_t sector;
792	uint16_t device;
793	uint8_t channel, slave;
794	uint8_t status, mode;
795
796	device = bios_dsk->drqp.dev_id;
797	channel = device / 2;
798	slave = device % 2;
799
800	iobase1 = bios_dsk->channels[channel].iobase1;
801	iobase2 = bios_dsk->channels[channel].iobase2;
802	mode = bios_dsk->devices[device].mode;
803	blksize = 0x200; // was = bios_dsk->devices[device].blksize;
804	#if VBOX_BIOS_CPU >= 80386
805	if (mode == ATA_MODE_PIO32)
806	blksize >>= 2;
807	else
808	#endif
809	blksize >>= 1;
810
811	status = inb(iobase1 + ATA_CB_STAT);
812	if (status & ATA_CB_STAT_BSY)
813	{
814	// Enable interrupts
815	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
816	return 1;
817	}
818
819	lba = bios_dsk->drqp.lba;
820	buffer = bios_dsk->drqp.buffer;
821	sector = bios_dsk->drqp.sector;
822	cylinder = bios_dsk->drqp.cylinder;
823	head = bios_dsk->drqp.head;
824
825	// sector will be 0 only on lba access. Convert to lba-chs
826	if (sector == 0) {
827	if (lba + count >= 268435456)
828	{
829	sector = (lba >> 24) & 0x00ff;
830	cylinder = (lba >> 32) & 0xffff;
831	outb(iobase1 + ATA_CB_SC, (count & 0xff00) >> 8);
832	outb(iobase1 + ATA_CB_SN, sector);
833	outb(iobase1 + ATA_CB_CL, cylinder & 0x00ff);
834	outb(iobase1 + ATA_CB_CH, cylinder >> 8);
835	/* Leave the bottom 24 bits as is, they are treated correctly by the
836	* LBA28 code path. */
837	lba &= 0xffffff;
838	}
839	sector = (uint16_t) (lba & 0x000000ffL);
840	lba >>= 8;
841	cylinder = (uint16_t) (lba & 0x0000ffffL);
842	lba >>= 16;
843	head = ((uint16_t) (lba & 0x0000000fL)) \| 0x40;
844	}
845
846	outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 \| ATA_CB_DC_NIEN);
847	outb(iobase1 + ATA_CB_FR, 0x00);
848	outb(iobase1 + ATA_CB_SC, count);
849	outb(iobase1 + ATA_CB_SN, sector);
850	outb(iobase1 + ATA_CB_CL, cylinder & 0x00ff);
851	outb(iobase1 + ATA_CB_CH, cylinder >> 8);
852	outb(iobase1 + ATA_CB_DH, (slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0) \| (uint8_t) head );
853	outb(iobase1 + ATA_CB_CMD, command);
854
855	while (1) {
856	status = inb(iobase1 + ATA_CB_STAT);
857	if ( !(status & ATA_CB_STAT_BSY) )
858	break;
859	}
860
861	if (status & ATA_CB_STAT_ERR) {
862	BX_DEBUG_ATA("%s: write error\n", __func__);
863	// Enable interrupts
864	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
865	return 2;
866	} else if ( !(status & ATA_CB_STAT_DRQ) ) {
867	BX_DEBUG_ATA("%s: DRQ not set (status %02x)\n", __func__, (unsigned) status);
868	// Enable interrupts
869	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
870	return 3;
871	}
872
873	// FIXME : move seg/off translation here
874
875	int_enable(); // enable higher priority interrupts
876
877	while (1) {
878
879	// adjust if there will be an overrun. 2K max sector size
880	if (FP_OFF(buffer) >= 0xF800)
881	buffer = MK_FP(FP_SEG(buffer) + 0x80, FP_OFF(buffer) - 0x800);
882
883	#if VBOX_BIOS_CPU >= 80386
884	if (mode == ATA_MODE_PIO32)
885	buffer = rep_outsd(buffer, blksize, iobase1);
886	else
887	#endif
888	buffer = rep_outsw(buffer, blksize, iobase1);
889
890	bios_dsk->drqp.trsfsectors++;
891	count--;
892	while (1) {
893	status = inb(iobase1 + ATA_CB_STAT);
894	if ( !(status & ATA_CB_STAT_BSY) )
895	break;
896	}
897	if (count == 0) {
898	if ( (status & (ATA_CB_STAT_BSY \| ATA_CB_STAT_RDY \| ATA_CB_STAT_DF \| ATA_CB_STAT_DRQ \| ATA_CB_STAT_ERR) )
899	!= ATA_CB_STAT_RDY ) {
900	BX_DEBUG_ATA("%s: no sectors left (status %02x)\n", __func__, (unsigned) status);
901	// Enable interrupts
902	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
903	return 6;
904	}
905	break;
906	}
907	else {
908	if ( (status & (ATA_CB_STAT_BSY \| ATA_CB_STAT_RDY \| ATA_CB_STAT_DRQ \| ATA_CB_STAT_ERR) )
909	!= (ATA_CB_STAT_RDY \| ATA_CB_STAT_DRQ) ) {
910	BX_DEBUG_ATA("%s: more sectors left (status %02x)\n", __func__, (unsigned) status);
911	// Enable interrupts
912	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
913	return 7;
914	}
915	continue;
916	}
917	}
918	// Enable interrupts
919	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
920	return 0;
921	}
922
923
924	/**
925	* Read sectors from an attached ATA device.
926	*
927	* @returns status code.
928	* @param bios_dsk Pointer to disk request packet (in the
929	* EBDA).
930	*/
931	int ata_read_sectors(bio_dsk_t __far *bios_dsk)
932	{
933	uint16_t n_sect;
934	int status;
935	uint8_t device_id;
936
937	device_id = bios_dsk->drqp.dev_id;
938	n_sect = bios_dsk->drqp.nsect;
939
940	if (bios_dsk->drqp.sector) {
941	/* CHS addressing. */
942	bios_dsk->devices[device_id].blksize = n_sect * 0x200;
943	BX_DEBUG_ATA("%s: reading %u sectors (CHS)\n", __func__, n_sect);
944	status = ata_cmd_data_in(bios_dsk, ATA_CMD_READ_MULTIPLE, n_sect);
945	bios_dsk->devices[device_id].blksize = 0x200;
946	} else {
947	/* LBA addressing. */
948	if (bios_dsk->drqp.lba + n_sect >= 268435456) {
949	BX_DEBUG_ATA("%s: reading %u sector (LBA,EXT)\n", __func__, n_sect);
950	status = ata_cmd_data_in(bios_dsk, ATA_CMD_READ_SECTORS_EXT, n_sect);
951	} else {
952	bios_dsk->devices[device_id].blksize = n_sect * 0x200;
953	BX_DEBUG_ATA("%s: reading %u sector (LBA,MULT)\n", __func__, n_sect);
954	status = ata_cmd_data_in(bios_dsk, ATA_CMD_READ_MULTIPLE, n_sect);
955	bios_dsk->devices[device_id].blksize = 0x200;
956	}
957	}
958	return status;
959	}
960
961	/**
962	* Write sectors to an attached ATA device.
963	*
964	* @returns status code.
965	* @param bios_dsk Pointer to disk request packet (in the
966	* EBDA).
967	*/
968	int ata_write_sectors(bio_dsk_t __far *bios_dsk)
969	{
970	uint16_t n_sect;
971
972	n_sect = bios_dsk->drqp.nsect;
973
974	if (bios_dsk->drqp.sector) {
975	/* CHS addressing. */
976	return ata_cmd_data_out(bios_dsk, ATA_CMD_WRITE_SECTORS, n_sect);
977	} else {
978	/* LBA addressing. */
979	if (bios_dsk->drqp.lba + n_sect >= 268435456)
980	return ata_cmd_data_out(bios_dsk, ATA_CMD_WRITE_SECTORS_EXT, n_sect);
981	else
982	return ata_cmd_data_out(bios_dsk, ATA_CMD_WRITE_SECTORS, n_sect);
983	}
984	}
985
986
987	// ---------------------------------------------------------------------------
988	// ATA/ATAPI driver : execute a packet command
989	// ---------------------------------------------------------------------------
990	// returns
991	// 0 : no error
992	// 1 : error in parameters
993	// 2 : BUSY bit set
994	// 3 : error
995	// 4 : not ready
996	uint16_t ata_cmd_packet(uint16_t device, uint8_t cmdlen, char __far *cmdbuf,
997	uint32_t length, uint8_t inout, char __far *buffer)
998	{
999	uint16_t iobase1, iobase2;
1000	uint16_t lcount, count;
1001	uint8_t channel, slave;
1002	uint8_t status, mode, lmode;
1003	uint32_t transfer;
1004	bio_dsk_t __far *bios_dsk;
1005
1006	bios_dsk = read_word(0x0040, 0x000E) :> &EbdaData->bdisk;
1007
1008	channel = device / 2;
1009	slave = device % 2;
1010
1011	// Data out is not supported yet
1012	if (inout == ATA_DATA_OUT) {
1013	BX_INFO("%s: DATA_OUT not supported yet\n", __func__);
1014	return 1;
1015	}
1016
1017	iobase1 = bios_dsk->channels[channel].iobase1;
1018	iobase2 = bios_dsk->channels[channel].iobase2;
1019	mode = bios_dsk->devices[device].mode;
1020	transfer = 0L;
1021
1022	if (cmdlen < 12)
1023	cmdlen = 12;
1024	if (cmdlen > 12)
1025	cmdlen = 16;
1026	cmdlen >>= 1;
1027
1028	// Reset count of transferred data
1029	/// @todo clear in calling code?
1030	bios_dsk->drqp.trsfsectors = 0;
1031	bios_dsk->drqp.trsfbytes = 0;
1032
1033	status = inb(iobase1 + ATA_CB_STAT);
1034	if (status & ATA_CB_STAT_BSY)
1035	return 2;
1036
1037	outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 \| ATA_CB_DC_NIEN);
1038	// outb(iobase1 + ATA_CB_FR, 0x00);
1039	// outb(iobase1 + ATA_CB_SC, 0x00);
1040	// outb(iobase1 + ATA_CB_SN, 0x00);
1041	outb(iobase1 + ATA_CB_CL, 0xfff0 & 0x00ff);
1042	outb(iobase1 + ATA_CB_CH, 0xfff0 >> 8);
1043	outb(iobase1 + ATA_CB_DH, slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0);
1044	outb(iobase1 + ATA_CB_CMD, ATA_CMD_PACKET);
1045
1046	// Device should ok to receive command
1047	while (1) {
1048	status = inb(iobase1 + ATA_CB_STAT);
1049	if ( !(status & ATA_CB_STAT_BSY) ) break;
1050	}
1051
1052	if (status & ATA_CB_STAT_CHK) {
1053	BX_DEBUG_ATA("%s: error, status is %02x\n", __func__, status);
1054	// Enable interrupts
1055	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
1056	return 3;
1057	} else if ( !(status & ATA_CB_STAT_DRQ) ) {
1058	BX_DEBUG_ATA("%s: DRQ not set (status %02x)\n", __func__, (unsigned) status);
1059	// Enable interrupts
1060	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
1061	return 4;
1062	}
1063
1064	int_enable(); // enable higher priority interrupts
1065
1066	// Normalize address
1067	BX_DEBUG_ATA("acp1 buffer ptr: %04x:%04x wlen %04x\n", FP_SEG(cmdbuf), FP_OFF(cmdbuf), cmdlen);
1068	cmdbuf = MK_FP(FP_SEG(cmdbuf) + FP_OFF(cmdbuf) / 16 , FP_OFF(cmdbuf) % 16);
1069	// cmdseg += (cmdoff / 16);
1070	// cmdoff %= 16;
1071
1072	// Send command to device
1073	rep_outsw(cmdbuf, cmdlen, iobase1);
1074
1075	if (inout == ATA_DATA_NO) {
1076	status = inb(iobase1 + ATA_CB_STAT);
1077	}
1078	else {
1079	while (1) {
1080
1081	while (1) {
1082	status = inb(iobase1 + ATA_CB_STAT);
1083	if ( !(status & ATA_CB_STAT_BSY) )
1084	break;
1085	}
1086
1087	// Check if command completed
1088	if ( (status & (ATA_CB_STAT_BSY \| ATA_CB_STAT_DRQ) ) ==0 )
1089	break;
1090
1091	if (status & ATA_CB_STAT_CHK) {
1092	BX_DEBUG_ATA("%s: error (status %02x)\n", __func__, status);
1093	// Enable interrupts
1094	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
1095	return 3;
1096	}
1097
1098	// Device must be ready to send data
1099	if ( (status & (ATA_CB_STAT_BSY \| ATA_CB_STAT_RDY \| ATA_CB_STAT_DRQ \| ATA_CB_STAT_CHK) )
1100	!= (ATA_CB_STAT_RDY \| ATA_CB_STAT_DRQ) ) {
1101	BX_DEBUG_ATA("%s: not ready (status %02x)\n", __func__, status);
1102	// Enable interrupts
1103	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
1104	return 4;
1105	}
1106
1107	// Normalize address
1108	BX_DEBUG_ATA("acp2 buffer ptr: %04x:%04x\n", FP_SEG(buffer), FP_OFF(buffer));
1109	buffer = MK_FP(FP_SEG(buffer) + FP_OFF(buffer) / 16 , FP_OFF(buffer) % 16);
1110	// bufseg += (bufoff / 16);
1111	// bufoff %= 16;
1112
1113	// Get the byte count
1114	lcount = ((uint16_t)(inb(iobase1 + ATA_CB_CH))<<8)+inb(iobase1 + ATA_CB_CL);
1115
1116	// Save byte count
1117	count = lcount;
1118
1119	BX_DEBUG_ATA("Trying to read %04x bytes ",lcount);
1120	BX_DEBUG_ATA("to 0x%04x:0x%04x\n",FP_SEG(buffer),FP_OFF(buffer));
1121
1122	// If counts not dividable by 4, use 16bits mode
1123	lmode = mode;
1124	if (lcount & 0x03)
1125	lmode = ATA_MODE_PIO16;
1126
1127	// adds an extra byte if count are odd. before is always even
1128	if (lcount & 0x01) {
1129	lcount += 1;
1130	}
1131
1132	#if VBOX_BIOS_CPU >= 80386
1133	if (lmode == ATA_MODE_PIO32) {
1134	lcount >>= 2;
1135	} else
1136	#endif
1137	{
1138	lcount >>= 1;
1139	}
1140
1141	#if VBOX_BIOS_CPU >= 80386
1142	if (lmode == ATA_MODE_PIO32) {
1143	rep_insd(buffer, lcount, iobase1);
1144	} else
1145	#endif
1146	{
1147	rep_insw(buffer, lcount, iobase1);
1148	}
1149
1150
1151	// Compute new buffer address
1152	buffer += count;
1153
1154	// Save transferred bytes count
1155	transfer += count;
1156	bios_dsk->drqp.trsfbytes = transfer;
1157	}
1158	}
1159
1160	// Final check, device must be ready
1161	if ( (status & (ATA_CB_STAT_BSY \| ATA_CB_STAT_RDY \| ATA_CB_STAT_DF \| ATA_CB_STAT_DRQ \| ATA_CB_STAT_CHK) )
1162	!= ATA_CB_STAT_RDY ) {
1163	BX_DEBUG_ATA("%s: not ready (status %02x)\n", __func__, (unsigned) status);
1164	// Enable interrupts
1165	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
1166	return 4;
1167	}
1168
1169	// Enable interrupts
1170	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
1171	return 0;
1172	}
1173
1174	// ---------------------------------------------------------------------------
1175	// ATA/ATAPI driver : reset device; intended for ATAPI devices
1176	// ---------------------------------------------------------------------------
1177	// returns
1178	// 0 : no error
1179	// 1 : error
1180	uint16_t ata_soft_reset(uint16_t device)
1181	{
1182	uint16_t iobase1, iobase2;
1183	uint8_t channel, slave;
1184	uint8_t status;
1185	bio_dsk_t __far *bios_dsk;
1186
1187	bios_dsk = read_word(0x0040, 0x000E) :> &EbdaData->bdisk;
1188
1189	channel = device / 2;
1190	slave = device % 2;
1191
1192	iobase1 = bios_dsk->channels[channel].iobase1;
1193	iobase2 = bios_dsk->channels[channel].iobase2;
1194
1195	/* Send a reset command to the device. */
1196	outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 \| ATA_CB_DC_NIEN);
1197	outb(iobase1 + ATA_CB_DH, slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0);
1198	outb(iobase1 + ATA_CB_CMD, ATA_CMD_DEVICE_RESET);
1199
1200	/* Wait for the device to clear BSY. */
1201	while (1) {
1202	status = inb(iobase1 + ATA_CB_STAT);
1203	if ( !(status & ATA_CB_STAT_BSY) ) break;
1204	}
1205
1206	/* Final check, device must be ready */
1207	if ( (status & (ATA_CB_STAT_BSY \| ATA_CB_STAT_RDY \| ATA_CB_STAT_DF \| ATA_CB_STAT_DRQ \| ATA_CB_STAT_CHK) )
1208	!= ATA_CB_STAT_RDY ) {
1209	BX_DEBUG_ATA("%s: not ready (status %02x)\n", __func__, (unsigned) status);
1210	/* Enable interrupts */
1211	outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15);
1212	return 1;
1213	}
1214
1215	/* Enable interrupts */
1216	outb(iobase2+ATA_CB_DC, ATA_CB_DC_HD15);
1217	return 0;
1218	}
1219
1220
1221	// ---------------------------------------------------------------------------
1222	// End of ATA/ATAPI Driver
1223	// ---------------------------------------------------------------------------

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source: vbox/trunk/src/VBox/Devices/PC/BIOS/ata.c@ 92290

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