root / tpm / tpm_tis.c @ 0d09e41a
History | View | Annotate | Download (28.9 kB)
1 |
/*
|
---|---|
2 |
* tpm_tis.c - QEMU's TPM TIS interface emulator
|
3 |
*
|
4 |
* Copyright (C) 2006,2010-2013 IBM Corporation
|
5 |
*
|
6 |
* Authors:
|
7 |
* Stefan Berger <stefanb@us.ibm.com>
|
8 |
* David Safford <safford@us.ibm.com>
|
9 |
*
|
10 |
* Xen 4 support: Andrease Niederl <andreas.niederl@iaik.tugraz.at>
|
11 |
*
|
12 |
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
13 |
* See the COPYING file in the top-level directory.
|
14 |
*
|
15 |
* Implementation of the TIS interface according to specs found at
|
16 |
* http://www.trustedcomputinggroup.org. This implementation currently
|
17 |
* supports version 1.21, revision 1.0.
|
18 |
* In the developers menu choose the PC Client section then find the TIS
|
19 |
* specification.
|
20 |
*/
|
21 |
|
22 |
#include "backends/tpm.h" |
23 |
#include "tpm_int.h" |
24 |
#include "block/block.h" |
25 |
#include "exec/address-spaces.h" |
26 |
#include "hw/hw.h" |
27 |
#include "hw/i386/pc.h" |
28 |
#include "hw/pci/pci_ids.h" |
29 |
#include "tpm/tpm_tis.h" |
30 |
#include "qemu-common.h" |
31 |
|
32 |
/*#define DEBUG_TIS */
|
33 |
|
34 |
#ifdef DEBUG_TIS
|
35 |
#define DPRINTF(fmt, ...) \
|
36 |
do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) |
37 |
#else
|
38 |
#define DPRINTF(fmt, ...) \
|
39 |
do { } while (0) |
40 |
#endif
|
41 |
|
42 |
/* whether the STS interrupt is supported */
|
43 |
#define RAISE_STS_IRQ
|
44 |
|
45 |
/* tis registers */
|
46 |
#define TPM_TIS_REG_ACCESS 0x00 |
47 |
#define TPM_TIS_REG_INT_ENABLE 0x08 |
48 |
#define TPM_TIS_REG_INT_VECTOR 0x0c |
49 |
#define TPM_TIS_REG_INT_STATUS 0x10 |
50 |
#define TPM_TIS_REG_INTF_CAPABILITY 0x14 |
51 |
#define TPM_TIS_REG_STS 0x18 |
52 |
#define TPM_TIS_REG_DATA_FIFO 0x24 |
53 |
#define TPM_TIS_REG_DID_VID 0xf00 |
54 |
#define TPM_TIS_REG_RID 0xf04 |
55 |
|
56 |
/* vendor-specific registers */
|
57 |
#define TPM_TIS_REG_DEBUG 0xf90 |
58 |
|
59 |
#define TPM_TIS_STS_VALID (1 << 7) |
60 |
#define TPM_TIS_STS_COMMAND_READY (1 << 6) |
61 |
#define TPM_TIS_STS_TPM_GO (1 << 5) |
62 |
#define TPM_TIS_STS_DATA_AVAILABLE (1 << 4) |
63 |
#define TPM_TIS_STS_EXPECT (1 << 3) |
64 |
#define TPM_TIS_STS_RESPONSE_RETRY (1 << 1) |
65 |
|
66 |
#define TPM_TIS_BURST_COUNT_SHIFT 8 |
67 |
#define TPM_TIS_BURST_COUNT(X) \
|
68 |
((X) << TPM_TIS_BURST_COUNT_SHIFT) |
69 |
|
70 |
#define TPM_TIS_ACCESS_TPM_REG_VALID_STS (1 << 7) |
71 |
#define TPM_TIS_ACCESS_ACTIVE_LOCALITY (1 << 5) |
72 |
#define TPM_TIS_ACCESS_BEEN_SEIZED (1 << 4) |
73 |
#define TPM_TIS_ACCESS_SEIZE (1 << 3) |
74 |
#define TPM_TIS_ACCESS_PENDING_REQUEST (1 << 2) |
75 |
#define TPM_TIS_ACCESS_REQUEST_USE (1 << 1) |
76 |
#define TPM_TIS_ACCESS_TPM_ESTABLISHMENT (1 << 0) |
77 |
|
78 |
#define TPM_TIS_INT_ENABLED (1 << 31) |
79 |
#define TPM_TIS_INT_DATA_AVAILABLE (1 << 0) |
80 |
#define TPM_TIS_INT_STS_VALID (1 << 1) |
81 |
#define TPM_TIS_INT_LOCALITY_CHANGED (1 << 2) |
82 |
#define TPM_TIS_INT_COMMAND_READY (1 << 7) |
83 |
|
84 |
#define TPM_TIS_INT_POLARITY_MASK (3 << 3) |
85 |
#define TPM_TIS_INT_POLARITY_LOW_LEVEL (1 << 3) |
86 |
|
87 |
#ifndef RAISE_STS_IRQ
|
88 |
|
89 |
#define TPM_TIS_INTERRUPTS_SUPPORTED (TPM_TIS_INT_LOCALITY_CHANGED | \
|
90 |
TPM_TIS_INT_DATA_AVAILABLE | \ |
91 |
TPM_TIS_INT_COMMAND_READY) |
92 |
|
93 |
#else
|
94 |
|
95 |
#define TPM_TIS_INTERRUPTS_SUPPORTED (TPM_TIS_INT_LOCALITY_CHANGED | \
|
96 |
TPM_TIS_INT_DATA_AVAILABLE | \ |
97 |
TPM_TIS_INT_STS_VALID | \ |
98 |
TPM_TIS_INT_COMMAND_READY) |
99 |
|
100 |
#endif
|
101 |
|
102 |
#define TPM_TIS_CAP_INTERRUPT_LOW_LEVEL (1 << 4) /* support is mandatory */ |
103 |
#define TPM_TIS_CAPABILITIES_SUPPORTED (TPM_TIS_CAP_INTERRUPT_LOW_LEVEL | \
|
104 |
TPM_TIS_INTERRUPTS_SUPPORTED) |
105 |
|
106 |
#define TPM_TIS_TPM_DID 0x0001 |
107 |
#define TPM_TIS_TPM_VID PCI_VENDOR_ID_IBM
|
108 |
#define TPM_TIS_TPM_RID 0x0001 |
109 |
|
110 |
#define TPM_TIS_NO_DATA_BYTE 0xff |
111 |
|
112 |
/* local prototypes */
|
113 |
|
114 |
static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr, |
115 |
unsigned size);
|
116 |
|
117 |
/* utility functions */
|
118 |
|
119 |
static uint8_t tpm_tis_locality_from_addr(hwaddr addr)
|
120 |
{ |
121 |
return (uint8_t)((addr >> TPM_TIS_LOCALITY_SHIFT) & 0x7); |
122 |
} |
123 |
|
124 |
static uint32_t tpm_tis_get_size_from_buffer(const TPMSizedBuffer *sb) |
125 |
{ |
126 |
return be32_to_cpu(*(uint32_t *)&sb->buffer[2]); |
127 |
} |
128 |
|
129 |
static void tpm_tis_show_buffer(const TPMSizedBuffer *sb, const char *string) |
130 |
{ |
131 |
#ifdef DEBUG_TIS
|
132 |
uint32_t len, i; |
133 |
|
134 |
len = tpm_tis_get_size_from_buffer(sb); |
135 |
DPRINTF("tpm_tis: %s length = %d\n", string, len);
|
136 |
for (i = 0; i < len; i++) { |
137 |
if (i && !(i % 16)) { |
138 |
DPRINTF("\n");
|
139 |
} |
140 |
DPRINTF("%.2X ", sb->buffer[i]);
|
141 |
} |
142 |
DPRINTF("\n");
|
143 |
#endif
|
144 |
} |
145 |
|
146 |
/*
|
147 |
* Send a request to the TPM.
|
148 |
*/
|
149 |
static void tpm_tis_tpm_send(TPMState *s, uint8_t locty) |
150 |
{ |
151 |
TPMTISEmuState *tis = &s->s.tis; |
152 |
|
153 |
tpm_tis_show_buffer(&tis->loc[locty].w_buffer, "tpm_tis: To TPM");
|
154 |
|
155 |
s->locty_number = locty; |
156 |
s->locty_data = &tis->loc[locty]; |
157 |
|
158 |
/*
|
159 |
* w_offset serves as length indicator for length of data;
|
160 |
* it's reset when the response comes back
|
161 |
*/
|
162 |
tis->loc[locty].state = TPM_TIS_STATE_EXECUTION; |
163 |
|
164 |
tpm_backend_deliver_request(s->be_driver); |
165 |
} |
166 |
|
167 |
/* raise an interrupt if allowed */
|
168 |
static void tpm_tis_raise_irq(TPMState *s, uint8_t locty, uint32_t irqmask) |
169 |
{ |
170 |
TPMTISEmuState *tis = &s->s.tis; |
171 |
|
172 |
if (!TPM_TIS_IS_VALID_LOCTY(locty)) {
|
173 |
return;
|
174 |
} |
175 |
|
176 |
if ((tis->loc[locty].inte & TPM_TIS_INT_ENABLED) &&
|
177 |
(tis->loc[locty].inte & irqmask)) { |
178 |
DPRINTF("tpm_tis: Raising IRQ for flag %08x\n", irqmask);
|
179 |
qemu_irq_raise(s->s.tis.irq); |
180 |
tis->loc[locty].ints |= irqmask; |
181 |
} |
182 |
} |
183 |
|
184 |
static uint32_t tpm_tis_check_request_use_except(TPMState *s, uint8_t locty)
|
185 |
{ |
186 |
uint8_t l; |
187 |
|
188 |
for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) { |
189 |
if (l == locty) {
|
190 |
continue;
|
191 |
} |
192 |
if ((s->s.tis.loc[l].access & TPM_TIS_ACCESS_REQUEST_USE)) {
|
193 |
return 1; |
194 |
} |
195 |
} |
196 |
|
197 |
return 0; |
198 |
} |
199 |
|
200 |
static void tpm_tis_new_active_locality(TPMState *s, uint8_t new_active_locty) |
201 |
{ |
202 |
TPMTISEmuState *tis = &s->s.tis; |
203 |
bool change = (s->s.tis.active_locty != new_active_locty);
|
204 |
bool is_seize;
|
205 |
uint8_t mask; |
206 |
|
207 |
if (change && TPM_TIS_IS_VALID_LOCTY(s->s.tis.active_locty)) {
|
208 |
is_seize = TPM_TIS_IS_VALID_LOCTY(new_active_locty) && |
209 |
tis->loc[new_active_locty].access & TPM_TIS_ACCESS_SEIZE; |
210 |
|
211 |
if (is_seize) {
|
212 |
mask = ~(TPM_TIS_ACCESS_ACTIVE_LOCALITY); |
213 |
} else {
|
214 |
mask = ~(TPM_TIS_ACCESS_ACTIVE_LOCALITY| |
215 |
TPM_TIS_ACCESS_REQUEST_USE); |
216 |
} |
217 |
/* reset flags on the old active locality */
|
218 |
tis->loc[s->s.tis.active_locty].access &= mask; |
219 |
|
220 |
if (is_seize) {
|
221 |
tis->loc[tis->active_locty].access |= TPM_TIS_ACCESS_BEEN_SEIZED; |
222 |
} |
223 |
} |
224 |
|
225 |
tis->active_locty = new_active_locty; |
226 |
|
227 |
DPRINTF("tpm_tis: Active locality is now %d\n", s->s.tis.active_locty);
|
228 |
|
229 |
if (TPM_TIS_IS_VALID_LOCTY(new_active_locty)) {
|
230 |
/* set flags on the new active locality */
|
231 |
tis->loc[new_active_locty].access |= TPM_TIS_ACCESS_ACTIVE_LOCALITY; |
232 |
tis->loc[new_active_locty].access &= ~(TPM_TIS_ACCESS_REQUEST_USE | |
233 |
TPM_TIS_ACCESS_SEIZE); |
234 |
} |
235 |
|
236 |
if (change) {
|
237 |
tpm_tis_raise_irq(s, tis->active_locty, TPM_TIS_INT_LOCALITY_CHANGED); |
238 |
} |
239 |
} |
240 |
|
241 |
/* abort -- this function switches the locality */
|
242 |
static void tpm_tis_abort(TPMState *s, uint8_t locty) |
243 |
{ |
244 |
TPMTISEmuState *tis = &s->s.tis; |
245 |
|
246 |
tis->loc[locty].r_offset = 0;
|
247 |
tis->loc[locty].w_offset = 0;
|
248 |
|
249 |
DPRINTF("tpm_tis: tis_abort: new active locality is %d\n", tis->next_locty);
|
250 |
|
251 |
/*
|
252 |
* Need to react differently depending on who's aborting now and
|
253 |
* which locality will become active afterwards.
|
254 |
*/
|
255 |
if (tis->aborting_locty == tis->next_locty) {
|
256 |
tis->loc[tis->aborting_locty].state = TPM_TIS_STATE_READY; |
257 |
tis->loc[tis->aborting_locty].sts = TPM_TIS_STS_COMMAND_READY; |
258 |
tpm_tis_raise_irq(s, tis->aborting_locty, TPM_TIS_INT_COMMAND_READY); |
259 |
} |
260 |
|
261 |
/* locality after abort is another one than the current one */
|
262 |
tpm_tis_new_active_locality(s, tis->next_locty); |
263 |
|
264 |
tis->next_locty = TPM_TIS_NO_LOCALITY; |
265 |
/* nobody's aborting a command anymore */
|
266 |
tis->aborting_locty = TPM_TIS_NO_LOCALITY; |
267 |
} |
268 |
|
269 |
/* prepare aborting current command */
|
270 |
static void tpm_tis_prep_abort(TPMState *s, uint8_t locty, uint8_t newlocty) |
271 |
{ |
272 |
TPMTISEmuState *tis = &s->s.tis; |
273 |
uint8_t busy_locty; |
274 |
|
275 |
tis->aborting_locty = locty; |
276 |
tis->next_locty = newlocty; /* locality after successful abort */
|
277 |
|
278 |
/*
|
279 |
* only abort a command using an interrupt if currently executing
|
280 |
* a command AND if there's a valid connection to the vTPM.
|
281 |
*/
|
282 |
for (busy_locty = 0; busy_locty < TPM_TIS_NUM_LOCALITIES; busy_locty++) { |
283 |
if (tis->loc[busy_locty].state == TPM_TIS_STATE_EXECUTION) {
|
284 |
/*
|
285 |
* request the backend to cancel. Some backends may not
|
286 |
* support it
|
287 |
*/
|
288 |
tpm_backend_cancel_cmd(s->be_driver); |
289 |
return;
|
290 |
} |
291 |
} |
292 |
|
293 |
tpm_tis_abort(s, locty); |
294 |
} |
295 |
|
296 |
static void tpm_tis_receive_bh(void *opaque) |
297 |
{ |
298 |
TPMState *s = opaque; |
299 |
TPMTISEmuState *tis = &s->s.tis; |
300 |
uint8_t locty = s->locty_number; |
301 |
|
302 |
tis->loc[locty].sts = TPM_TIS_STS_VALID | TPM_TIS_STS_DATA_AVAILABLE; |
303 |
tis->loc[locty].state = TPM_TIS_STATE_COMPLETION; |
304 |
tis->loc[locty].r_offset = 0;
|
305 |
tis->loc[locty].w_offset = 0;
|
306 |
|
307 |
if (TPM_TIS_IS_VALID_LOCTY(tis->next_locty)) {
|
308 |
tpm_tis_abort(s, locty); |
309 |
} |
310 |
|
311 |
#ifndef RAISE_STS_IRQ
|
312 |
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_DATA_AVAILABLE); |
313 |
#else
|
314 |
tpm_tis_raise_irq(s, locty, |
315 |
TPM_TIS_INT_DATA_AVAILABLE | TPM_TIS_INT_STS_VALID); |
316 |
#endif
|
317 |
} |
318 |
|
319 |
/*
|
320 |
* Callback from the TPM to indicate that the response was received.
|
321 |
*/
|
322 |
static void tpm_tis_receive_cb(TPMState *s, uint8_t locty) |
323 |
{ |
324 |
TPMTISEmuState *tis = &s->s.tis; |
325 |
|
326 |
assert(s->locty_number == locty); |
327 |
|
328 |
qemu_bh_schedule(tis->bh); |
329 |
} |
330 |
|
331 |
/*
|
332 |
* Read a byte of response data
|
333 |
*/
|
334 |
static uint32_t tpm_tis_data_read(TPMState *s, uint8_t locty)
|
335 |
{ |
336 |
TPMTISEmuState *tis = &s->s.tis; |
337 |
uint32_t ret = TPM_TIS_NO_DATA_BYTE; |
338 |
uint16_t len; |
339 |
|
340 |
if ((tis->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) {
|
341 |
len = tpm_tis_get_size_from_buffer(&tis->loc[locty].r_buffer); |
342 |
|
343 |
ret = tis->loc[locty].r_buffer.buffer[tis->loc[locty].r_offset++]; |
344 |
if (tis->loc[locty].r_offset >= len) {
|
345 |
/* got last byte */
|
346 |
tis->loc[locty].sts = TPM_TIS_STS_VALID; |
347 |
#ifdef RAISE_STS_IRQ
|
348 |
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID); |
349 |
#endif
|
350 |
} |
351 |
DPRINTF("tpm_tis: tpm_tis_data_read byte 0x%02x [%d]\n",
|
352 |
ret, tis->loc[locty].r_offset-1);
|
353 |
} |
354 |
|
355 |
return ret;
|
356 |
} |
357 |
|
358 |
#ifdef DEBUG_TIS
|
359 |
static void tpm_tis_dump_state(void *opaque, hwaddr addr) |
360 |
{ |
361 |
static const unsigned regs[] = { |
362 |
TPM_TIS_REG_ACCESS, |
363 |
TPM_TIS_REG_INT_ENABLE, |
364 |
TPM_TIS_REG_INT_VECTOR, |
365 |
TPM_TIS_REG_INT_STATUS, |
366 |
TPM_TIS_REG_INTF_CAPABILITY, |
367 |
TPM_TIS_REG_STS, |
368 |
TPM_TIS_REG_DID_VID, |
369 |
TPM_TIS_REG_RID, |
370 |
0xfff};
|
371 |
int idx;
|
372 |
uint8_t locty = tpm_tis_locality_from_addr(addr); |
373 |
hwaddr base = addr & ~0xfff;
|
374 |
TPMState *s = opaque; |
375 |
TPMTISEmuState *tis = &s->s.tis; |
376 |
|
377 |
DPRINTF("tpm_tis: active locality : %d\n"
|
378 |
"tpm_tis: state of locality %d : %d\n"
|
379 |
"tpm_tis: register dump:\n",
|
380 |
tis->active_locty, |
381 |
locty, tis->loc[locty].state); |
382 |
|
383 |
for (idx = 0; regs[idx] != 0xfff; idx++) { |
384 |
DPRINTF("tpm_tis: 0x%04x : 0x%08x\n", regs[idx],
|
385 |
(uint32_t)tpm_tis_mmio_read(opaque, base + regs[idx], 4));
|
386 |
} |
387 |
|
388 |
DPRINTF("tpm_tis: read offset : %d\n"
|
389 |
"tpm_tis: result buffer : ",
|
390 |
tis->loc[locty].r_offset); |
391 |
for (idx = 0; |
392 |
idx < tpm_tis_get_size_from_buffer(&tis->loc[locty].r_buffer); |
393 |
idx++) { |
394 |
DPRINTF("%c%02x%s",
|
395 |
tis->loc[locty].r_offset == idx ? '>' : ' ', |
396 |
tis->loc[locty].r_buffer.buffer[idx], |
397 |
((idx & 0xf) == 0xf) ? "\ntpm_tis: " : ""); |
398 |
} |
399 |
DPRINTF("\n"
|
400 |
"tpm_tis: write offset : %d\n"
|
401 |
"tpm_tis: request buffer: ",
|
402 |
tis->loc[locty].w_offset); |
403 |
for (idx = 0; |
404 |
idx < tpm_tis_get_size_from_buffer(&tis->loc[locty].w_buffer); |
405 |
idx++) { |
406 |
DPRINTF("%c%02x%s",
|
407 |
tis->loc[locty].w_offset == idx ? '>' : ' ', |
408 |
tis->loc[locty].w_buffer.buffer[idx], |
409 |
((idx & 0xf) == 0xf) ? "\ntpm_tis: " : ""); |
410 |
} |
411 |
DPRINTF("\n");
|
412 |
} |
413 |
#endif
|
414 |
|
415 |
/*
|
416 |
* Read a register of the TIS interface
|
417 |
* See specs pages 33-63 for description of the registers
|
418 |
*/
|
419 |
static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr, |
420 |
unsigned size)
|
421 |
{ |
422 |
TPMState *s = opaque; |
423 |
TPMTISEmuState *tis = &s->s.tis; |
424 |
uint16_t offset = addr & 0xffc;
|
425 |
uint8_t shift = (addr & 0x3) * 8; |
426 |
uint32_t val = 0xffffffff;
|
427 |
uint8_t locty = tpm_tis_locality_from_addr(addr); |
428 |
uint32_t avail; |
429 |
|
430 |
if (tpm_backend_had_startup_error(s->be_driver)) {
|
431 |
return val;
|
432 |
} |
433 |
|
434 |
switch (offset) {
|
435 |
case TPM_TIS_REG_ACCESS:
|
436 |
/* never show the SEIZE flag even though we use it internally */
|
437 |
val = tis->loc[locty].access & ~TPM_TIS_ACCESS_SEIZE; |
438 |
/* the pending flag is always calculated */
|
439 |
if (tpm_tis_check_request_use_except(s, locty)) {
|
440 |
val |= TPM_TIS_ACCESS_PENDING_REQUEST; |
441 |
} |
442 |
val |= !tpm_backend_get_tpm_established_flag(s->be_driver); |
443 |
break;
|
444 |
case TPM_TIS_REG_INT_ENABLE:
|
445 |
val = tis->loc[locty].inte; |
446 |
break;
|
447 |
case TPM_TIS_REG_INT_VECTOR:
|
448 |
val = tis->irq_num; |
449 |
break;
|
450 |
case TPM_TIS_REG_INT_STATUS:
|
451 |
val = tis->loc[locty].ints; |
452 |
break;
|
453 |
case TPM_TIS_REG_INTF_CAPABILITY:
|
454 |
val = TPM_TIS_CAPABILITIES_SUPPORTED; |
455 |
break;
|
456 |
case TPM_TIS_REG_STS:
|
457 |
if (tis->active_locty == locty) {
|
458 |
if ((tis->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) {
|
459 |
val = TPM_TIS_BURST_COUNT( |
460 |
tpm_tis_get_size_from_buffer(&tis->loc[locty].r_buffer) |
461 |
- tis->loc[locty].r_offset) | tis->loc[locty].sts; |
462 |
} else {
|
463 |
avail = tis->loc[locty].w_buffer.size |
464 |
- tis->loc[locty].w_offset; |
465 |
/*
|
466 |
* byte-sized reads should not return 0x00 for 0x100
|
467 |
* available bytes.
|
468 |
*/
|
469 |
if (size == 1 && avail > 0xff) { |
470 |
avail = 0xff;
|
471 |
} |
472 |
val = TPM_TIS_BURST_COUNT(avail) | tis->loc[locty].sts; |
473 |
} |
474 |
} |
475 |
break;
|
476 |
case TPM_TIS_REG_DATA_FIFO:
|
477 |
if (tis->active_locty == locty) {
|
478 |
switch (tis->loc[locty].state) {
|
479 |
case TPM_TIS_STATE_COMPLETION:
|
480 |
val = tpm_tis_data_read(s, locty); |
481 |
break;
|
482 |
default:
|
483 |
val = TPM_TIS_NO_DATA_BYTE; |
484 |
break;
|
485 |
} |
486 |
} |
487 |
break;
|
488 |
case TPM_TIS_REG_DID_VID:
|
489 |
val = (TPM_TIS_TPM_DID << 16) | TPM_TIS_TPM_VID;
|
490 |
break;
|
491 |
case TPM_TIS_REG_RID:
|
492 |
val = TPM_TIS_TPM_RID; |
493 |
break;
|
494 |
#ifdef DEBUG_TIS
|
495 |
case TPM_TIS_REG_DEBUG:
|
496 |
tpm_tis_dump_state(opaque, addr); |
497 |
break;
|
498 |
#endif
|
499 |
} |
500 |
|
501 |
if (shift) {
|
502 |
val >>= shift; |
503 |
} |
504 |
|
505 |
DPRINTF("tpm_tis: read.%u(%08x) = %08x\n", size, (int)addr, (uint32_t)val); |
506 |
|
507 |
return val;
|
508 |
} |
509 |
|
510 |
/*
|
511 |
* Write a value to a register of the TIS interface
|
512 |
* See specs pages 33-63 for description of the registers
|
513 |
*/
|
514 |
static void tpm_tis_mmio_write_intern(void *opaque, hwaddr addr, |
515 |
uint64_t val, unsigned size,
|
516 |
bool hw_access)
|
517 |
{ |
518 |
TPMState *s = opaque; |
519 |
TPMTISEmuState *tis = &s->s.tis; |
520 |
uint16_t off = addr & 0xfff;
|
521 |
uint8_t locty = tpm_tis_locality_from_addr(addr); |
522 |
uint8_t active_locty, l; |
523 |
int c, set_new_locty = 1; |
524 |
uint16_t len; |
525 |
|
526 |
DPRINTF("tpm_tis: write.%u(%08x) = %08x\n", size, (int)addr, (uint32_t)val); |
527 |
|
528 |
if (locty == 4 && !hw_access) { |
529 |
DPRINTF("tpm_tis: Access to locality 4 only allowed from hardware\n");
|
530 |
return;
|
531 |
} |
532 |
|
533 |
if (tpm_backend_had_startup_error(s->be_driver)) {
|
534 |
return;
|
535 |
} |
536 |
|
537 |
switch (off) {
|
538 |
case TPM_TIS_REG_ACCESS:
|
539 |
|
540 |
if ((val & TPM_TIS_ACCESS_SEIZE)) {
|
541 |
val &= ~(TPM_TIS_ACCESS_REQUEST_USE | |
542 |
TPM_TIS_ACCESS_ACTIVE_LOCALITY); |
543 |
} |
544 |
|
545 |
active_locty = tis->active_locty; |
546 |
|
547 |
if ((val & TPM_TIS_ACCESS_ACTIVE_LOCALITY)) {
|
548 |
/* give up locality if currently owned */
|
549 |
if (tis->active_locty == locty) {
|
550 |
DPRINTF("tpm_tis: Releasing locality %d\n", locty);
|
551 |
|
552 |
uint8_t newlocty = TPM_TIS_NO_LOCALITY; |
553 |
/* anybody wants the locality ? */
|
554 |
for (c = TPM_TIS_NUM_LOCALITIES - 1; c >= 0; c--) { |
555 |
if ((tis->loc[c].access & TPM_TIS_ACCESS_REQUEST_USE)) {
|
556 |
DPRINTF("tpm_tis: Locality %d requests use.\n", c);
|
557 |
newlocty = c; |
558 |
break;
|
559 |
} |
560 |
} |
561 |
DPRINTF("tpm_tis: TPM_TIS_ACCESS_ACTIVE_LOCALITY: "
|
562 |
"Next active locality: %d\n",
|
563 |
newlocty); |
564 |
|
565 |
if (TPM_TIS_IS_VALID_LOCTY(newlocty)) {
|
566 |
set_new_locty = 0;
|
567 |
tpm_tis_prep_abort(s, locty, newlocty); |
568 |
} else {
|
569 |
active_locty = TPM_TIS_NO_LOCALITY; |
570 |
} |
571 |
} else {
|
572 |
/* not currently the owner; clear a pending request */
|
573 |
tis->loc[locty].access &= ~TPM_TIS_ACCESS_REQUEST_USE; |
574 |
} |
575 |
} |
576 |
|
577 |
if ((val & TPM_TIS_ACCESS_BEEN_SEIZED)) {
|
578 |
tis->loc[locty].access &= ~TPM_TIS_ACCESS_BEEN_SEIZED; |
579 |
} |
580 |
|
581 |
if ((val & TPM_TIS_ACCESS_SEIZE)) {
|
582 |
/*
|
583 |
* allow seize if a locality is active and the requesting
|
584 |
* locality is higher than the one that's active
|
585 |
* OR
|
586 |
* allow seize for requesting locality if no locality is
|
587 |
* active
|
588 |
*/
|
589 |
while ((TPM_TIS_IS_VALID_LOCTY(tis->active_locty) &&
|
590 |
locty > tis->active_locty) || |
591 |
!TPM_TIS_IS_VALID_LOCTY(tis->active_locty)) { |
592 |
bool higher_seize = FALSE;
|
593 |
|
594 |
/* already a pending SEIZE ? */
|
595 |
if ((tis->loc[locty].access & TPM_TIS_ACCESS_SEIZE)) {
|
596 |
break;
|
597 |
} |
598 |
|
599 |
/* check for ongoing seize by a higher locality */
|
600 |
for (l = locty + 1; l < TPM_TIS_NUM_LOCALITIES; l++) { |
601 |
if ((tis->loc[l].access & TPM_TIS_ACCESS_SEIZE)) {
|
602 |
higher_seize = TRUE; |
603 |
break;
|
604 |
} |
605 |
} |
606 |
|
607 |
if (higher_seize) {
|
608 |
break;
|
609 |
} |
610 |
|
611 |
/* cancel any seize by a lower locality */
|
612 |
for (l = 0; l < locty - 1; l++) { |
613 |
tis->loc[l].access &= ~TPM_TIS_ACCESS_SEIZE; |
614 |
} |
615 |
|
616 |
tis->loc[locty].access |= TPM_TIS_ACCESS_SEIZE; |
617 |
DPRINTF("tpm_tis: TPM_TIS_ACCESS_SEIZE: "
|
618 |
"Locality %d seized from locality %d\n",
|
619 |
locty, tis->active_locty); |
620 |
DPRINTF("tpm_tis: TPM_TIS_ACCESS_SEIZE: Initiating abort.\n");
|
621 |
set_new_locty = 0;
|
622 |
tpm_tis_prep_abort(s, tis->active_locty, locty); |
623 |
break;
|
624 |
} |
625 |
} |
626 |
|
627 |
if ((val & TPM_TIS_ACCESS_REQUEST_USE)) {
|
628 |
if (tis->active_locty != locty) {
|
629 |
if (TPM_TIS_IS_VALID_LOCTY(tis->active_locty)) {
|
630 |
tis->loc[locty].access |= TPM_TIS_ACCESS_REQUEST_USE; |
631 |
} else {
|
632 |
/* no locality active -> make this one active now */
|
633 |
active_locty = locty; |
634 |
} |
635 |
} |
636 |
} |
637 |
|
638 |
if (set_new_locty) {
|
639 |
tpm_tis_new_active_locality(s, active_locty); |
640 |
} |
641 |
|
642 |
break;
|
643 |
case TPM_TIS_REG_INT_ENABLE:
|
644 |
if (tis->active_locty != locty) {
|
645 |
break;
|
646 |
} |
647 |
|
648 |
tis->loc[locty].inte = (val & (TPM_TIS_INT_ENABLED | |
649 |
TPM_TIS_INT_POLARITY_MASK | |
650 |
TPM_TIS_INTERRUPTS_SUPPORTED)); |
651 |
break;
|
652 |
case TPM_TIS_REG_INT_VECTOR:
|
653 |
/* hard wired -- ignore */
|
654 |
break;
|
655 |
case TPM_TIS_REG_INT_STATUS:
|
656 |
if (tis->active_locty != locty) {
|
657 |
break;
|
658 |
} |
659 |
|
660 |
/* clearing of interrupt flags */
|
661 |
if (((val & TPM_TIS_INTERRUPTS_SUPPORTED)) &&
|
662 |
(tis->loc[locty].ints & TPM_TIS_INTERRUPTS_SUPPORTED)) { |
663 |
tis->loc[locty].ints &= ~val; |
664 |
if (tis->loc[locty].ints == 0) { |
665 |
qemu_irq_lower(tis->irq); |
666 |
DPRINTF("tpm_tis: Lowering IRQ\n");
|
667 |
} |
668 |
} |
669 |
tis->loc[locty].ints &= ~(val & TPM_TIS_INTERRUPTS_SUPPORTED); |
670 |
break;
|
671 |
case TPM_TIS_REG_STS:
|
672 |
if (tis->active_locty != locty) {
|
673 |
break;
|
674 |
} |
675 |
|
676 |
val &= (TPM_TIS_STS_COMMAND_READY | TPM_TIS_STS_TPM_GO | |
677 |
TPM_TIS_STS_RESPONSE_RETRY); |
678 |
|
679 |
if (val == TPM_TIS_STS_COMMAND_READY) {
|
680 |
switch (tis->loc[locty].state) {
|
681 |
|
682 |
case TPM_TIS_STATE_READY:
|
683 |
tis->loc[locty].w_offset = 0;
|
684 |
tis->loc[locty].r_offset = 0;
|
685 |
break;
|
686 |
|
687 |
case TPM_TIS_STATE_IDLE:
|
688 |
tis->loc[locty].sts = TPM_TIS_STS_COMMAND_READY; |
689 |
tis->loc[locty].state = TPM_TIS_STATE_READY; |
690 |
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_COMMAND_READY); |
691 |
break;
|
692 |
|
693 |
case TPM_TIS_STATE_EXECUTION:
|
694 |
case TPM_TIS_STATE_RECEPTION:
|
695 |
/* abort currently running command */
|
696 |
DPRINTF("tpm_tis: %s: Initiating abort.\n",
|
697 |
__func__); |
698 |
tpm_tis_prep_abort(s, locty, locty); |
699 |
break;
|
700 |
|
701 |
case TPM_TIS_STATE_COMPLETION:
|
702 |
tis->loc[locty].w_offset = 0;
|
703 |
tis->loc[locty].r_offset = 0;
|
704 |
/* shortcut to ready state with C/R set */
|
705 |
tis->loc[locty].state = TPM_TIS_STATE_READY; |
706 |
if (!(tis->loc[locty].sts & TPM_TIS_STS_COMMAND_READY)) {
|
707 |
tis->loc[locty].sts = TPM_TIS_STS_COMMAND_READY; |
708 |
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_COMMAND_READY); |
709 |
} |
710 |
tis->loc[locty].sts &= ~(TPM_TIS_STS_DATA_AVAILABLE); |
711 |
break;
|
712 |
|
713 |
} |
714 |
} else if (val == TPM_TIS_STS_TPM_GO) { |
715 |
switch (tis->loc[locty].state) {
|
716 |
case TPM_TIS_STATE_RECEPTION:
|
717 |
if ((tis->loc[locty].sts & TPM_TIS_STS_EXPECT) == 0) { |
718 |
tpm_tis_tpm_send(s, locty); |
719 |
} |
720 |
break;
|
721 |
default:
|
722 |
/* ignore */
|
723 |
break;
|
724 |
} |
725 |
} else if (val == TPM_TIS_STS_RESPONSE_RETRY) { |
726 |
switch (tis->loc[locty].state) {
|
727 |
case TPM_TIS_STATE_COMPLETION:
|
728 |
tis->loc[locty].r_offset = 0;
|
729 |
tis->loc[locty].sts = TPM_TIS_STS_VALID | |
730 |
TPM_TIS_STS_DATA_AVAILABLE; |
731 |
break;
|
732 |
default:
|
733 |
/* ignore */
|
734 |
break;
|
735 |
} |
736 |
} |
737 |
break;
|
738 |
case TPM_TIS_REG_DATA_FIFO:
|
739 |
/* data fifo */
|
740 |
if (tis->active_locty != locty) {
|
741 |
break;
|
742 |
} |
743 |
|
744 |
if (tis->loc[locty].state == TPM_TIS_STATE_IDLE ||
|
745 |
tis->loc[locty].state == TPM_TIS_STATE_EXECUTION || |
746 |
tis->loc[locty].state == TPM_TIS_STATE_COMPLETION) { |
747 |
/* drop the byte */
|
748 |
} else {
|
749 |
DPRINTF("tpm_tis: Byte to send to TPM: %02x\n", (uint8_t)val);
|
750 |
if (tis->loc[locty].state == TPM_TIS_STATE_READY) {
|
751 |
tis->loc[locty].state = TPM_TIS_STATE_RECEPTION; |
752 |
tis->loc[locty].sts = TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID; |
753 |
} |
754 |
|
755 |
if ((tis->loc[locty].sts & TPM_TIS_STS_EXPECT)) {
|
756 |
if (tis->loc[locty].w_offset < tis->loc[locty].w_buffer.size) {
|
757 |
tis->loc[locty].w_buffer. |
758 |
buffer[tis->loc[locty].w_offset++] = (uint8_t)val; |
759 |
} else {
|
760 |
tis->loc[locty].sts = TPM_TIS_STS_VALID; |
761 |
} |
762 |
} |
763 |
|
764 |
/* check for complete packet */
|
765 |
if (tis->loc[locty].w_offset > 5 && |
766 |
(tis->loc[locty].sts & TPM_TIS_STS_EXPECT)) { |
767 |
/* we have a packet length - see if we have all of it */
|
768 |
#ifdef RAISE_STS_IRQ
|
769 |
bool needIrq = !(tis->loc[locty].sts & TPM_TIS_STS_VALID);
|
770 |
#endif
|
771 |
len = tpm_tis_get_size_from_buffer(&tis->loc[locty].w_buffer); |
772 |
if (len > tis->loc[locty].w_offset) {
|
773 |
tis->loc[locty].sts = TPM_TIS_STS_EXPECT | |
774 |
TPM_TIS_STS_VALID; |
775 |
} else {
|
776 |
/* packet complete */
|
777 |
tis->loc[locty].sts = TPM_TIS_STS_VALID; |
778 |
} |
779 |
#ifdef RAISE_STS_IRQ
|
780 |
if (needIrq) {
|
781 |
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID); |
782 |
} |
783 |
#endif
|
784 |
} |
785 |
} |
786 |
break;
|
787 |
} |
788 |
} |
789 |
|
790 |
static void tpm_tis_mmio_write(void *opaque, hwaddr addr, |
791 |
uint64_t val, unsigned size)
|
792 |
{ |
793 |
return tpm_tis_mmio_write_intern(opaque, addr, val, size, false); |
794 |
} |
795 |
|
796 |
static const MemoryRegionOps tpm_tis_memory_ops = { |
797 |
.read = tpm_tis_mmio_read, |
798 |
.write = tpm_tis_mmio_write, |
799 |
.endianness = DEVICE_LITTLE_ENDIAN, |
800 |
.valid = { |
801 |
.min_access_size = 1,
|
802 |
.max_access_size = 4,
|
803 |
}, |
804 |
}; |
805 |
|
806 |
static int tpm_tis_do_startup_tpm(TPMState *s) |
807 |
{ |
808 |
return tpm_backend_startup_tpm(s->be_driver);
|
809 |
} |
810 |
|
811 |
/*
|
812 |
* This function is called when the machine starts, resets or due to
|
813 |
* S3 resume.
|
814 |
*/
|
815 |
static void tpm_tis_reset(DeviceState *dev) |
816 |
{ |
817 |
TPMState *s = TPM(dev); |
818 |
TPMTISEmuState *tis = &s->s.tis; |
819 |
int c;
|
820 |
|
821 |
tpm_backend_reset(s->be_driver); |
822 |
|
823 |
tis->active_locty = TPM_TIS_NO_LOCALITY; |
824 |
tis->next_locty = TPM_TIS_NO_LOCALITY; |
825 |
tis->aborting_locty = TPM_TIS_NO_LOCALITY; |
826 |
|
827 |
for (c = 0; c < TPM_TIS_NUM_LOCALITIES; c++) { |
828 |
tis->loc[c].access = TPM_TIS_ACCESS_TPM_REG_VALID_STS; |
829 |
tis->loc[c].sts = 0;
|
830 |
tis->loc[c].inte = TPM_TIS_INT_POLARITY_LOW_LEVEL; |
831 |
tis->loc[c].ints = 0;
|
832 |
tis->loc[c].state = TPM_TIS_STATE_IDLE; |
833 |
|
834 |
tis->loc[c].w_offset = 0;
|
835 |
tpm_backend_realloc_buffer(s->be_driver, &tis->loc[c].w_buffer); |
836 |
tis->loc[c].r_offset = 0;
|
837 |
tpm_backend_realloc_buffer(s->be_driver, &tis->loc[c].r_buffer); |
838 |
} |
839 |
|
840 |
tpm_tis_do_startup_tpm(s); |
841 |
} |
842 |
|
843 |
static const VMStateDescription vmstate_tpm_tis = { |
844 |
.name = "tpm",
|
845 |
.unmigratable = 1,
|
846 |
}; |
847 |
|
848 |
static Property tpm_tis_properties[] = {
|
849 |
DEFINE_PROP_UINT32("irq", TPMState,
|
850 |
s.tis.irq_num, TPM_TIS_IRQ), |
851 |
DEFINE_PROP_STRING("tpmdev", TPMState, backend),
|
852 |
DEFINE_PROP_END_OF_LIST(), |
853 |
}; |
854 |
|
855 |
static void tpm_tis_realizefn(DeviceState *dev, Error **errp) |
856 |
{ |
857 |
TPMState *s = TPM(dev); |
858 |
TPMTISEmuState *tis = &s->s.tis; |
859 |
|
860 |
s->be_driver = qemu_find_tpm(s->backend); |
861 |
if (!s->be_driver) {
|
862 |
error_setg(errp, "tpm_tis: backend driver with id %s could not be "
|
863 |
"found", s->backend);
|
864 |
return;
|
865 |
} |
866 |
|
867 |
s->be_driver->fe_model = TPM_MODEL_TPM_TIS; |
868 |
|
869 |
if (tpm_backend_init(s->be_driver, s, tpm_tis_receive_cb)) {
|
870 |
error_setg(errp, "tpm_tis: backend driver with id %s could not be "
|
871 |
"initialized", s->backend);
|
872 |
return;
|
873 |
} |
874 |
|
875 |
if (tis->irq_num > 15) { |
876 |
error_setg(errp, "tpm_tis: IRQ %d for TPM TIS is outside valid range "
|
877 |
"of 0 to 15.\n", tis->irq_num);
|
878 |
return;
|
879 |
} |
880 |
|
881 |
tis->bh = qemu_bh_new(tpm_tis_receive_bh, s); |
882 |
|
883 |
isa_init_irq(&s->busdev, &tis->irq, tis->irq_num); |
884 |
} |
885 |
|
886 |
static void tpm_tis_initfn(Object *obj) |
887 |
{ |
888 |
ISADevice *dev = ISA_DEVICE(obj); |
889 |
TPMState *s = TPM(obj); |
890 |
|
891 |
memory_region_init_io(&s->mmio, &tpm_tis_memory_ops, s, "tpm-tis-mmio",
|
892 |
TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT); |
893 |
memory_region_add_subregion(isa_address_space(dev), TPM_TIS_ADDR_BASE, |
894 |
&s->mmio); |
895 |
} |
896 |
|
897 |
static void tpm_tis_uninitfn(Object *obj) |
898 |
{ |
899 |
TPMState *s = TPM(obj); |
900 |
|
901 |
memory_region_del_subregion(get_system_memory(), &s->mmio); |
902 |
memory_region_destroy(&s->mmio); |
903 |
} |
904 |
|
905 |
static void tpm_tis_class_init(ObjectClass *klass, void *data) |
906 |
{ |
907 |
DeviceClass *dc = DEVICE_CLASS(klass); |
908 |
|
909 |
dc->realize = tpm_tis_realizefn; |
910 |
dc->props = tpm_tis_properties; |
911 |
dc->reset = tpm_tis_reset; |
912 |
dc->vmsd = &vmstate_tpm_tis; |
913 |
} |
914 |
|
915 |
static const TypeInfo tpm_tis_info = { |
916 |
.name = TYPE_TPM_TIS, |
917 |
.parent = TYPE_ISA_DEVICE, |
918 |
.instance_size = sizeof(TPMState),
|
919 |
.instance_init = tpm_tis_initfn, |
920 |
.instance_finalize = tpm_tis_uninitfn, |
921 |
.class_init = tpm_tis_class_init, |
922 |
}; |
923 |
|
924 |
static void tpm_tis_register(void) |
925 |
{ |
926 |
type_register_static(&tpm_tis_info); |
927 |
tpm_register_model(TPM_MODEL_TPM_TIS); |
928 |
} |
929 |
|
930 |
type_init(tpm_tis_register) |