static void tpm_tis_new_active_locality(TPMState *s, uint8_t new_active_locty)
{
TPMTISEmuState *tis = &s->s.tis;
bool change = (s->s.tis.active_locty != new_active_locty);
bool is_seize;
uint8_t mask;
if (change && TPM_TIS_IS_VALID_LOCTY(s->s.tis.active_locty)) {
is_seize = TPM_TIS_IS_VALID_LOCTY(new_active_locty) &&
tis->loc[new_active_locty].access & TPM_TIS_ACCESS_SEIZE;
if (is_seize) {
mask = ~(TPM_TIS_ACCESS_ACTIVE_LOCALITY);
} else {
mask = ~(TPM_TIS_ACCESS_ACTIVE_LOCALITY|
TPM_TIS_ACCESS_REQUEST_USE);
}
/* reset flags on the old active locality */
tis->loc[s->s.tis.active_locty].access &= mask;
if (is_seize) {
tis->loc[tis->active_locty].access |= TPM_TIS_ACCESS_BEEN_SEIZED;
}
}
tis->active_locty = new_active_locty;
DPRINTF("tpm_tis: Active locality is now %d\n", s->s.tis.active_locty);
if (TPM_TIS_IS_VALID_LOCTY(new_active_locty)) {
/* set flags on the new active locality */
tis->loc[new_active_locty].access |= TPM_TIS_ACCESS_ACTIVE_LOCALITY;
tis->loc[new_active_locty].access &= ~(TPM_TIS_ACCESS_REQUEST_USE |
TPM_TIS_ACCESS_SEIZE);
}
if (change) {
tpm_tis_raise_irq(s, tis->active_locty, TPM_TIS_INT_LOCALITY_CHANGED);
}
}
/* raise an interrupt if allowed */
static void tpm_tis_raise_irq(TPMState *s, uint8_t locty, uint32_t irqmask)
{
TPMTISEmuState *tis = &s->s.tis;
if (!TPM_TIS_IS_VALID_LOCTY(locty)) {
return;
}
if ((tis->loc[locty].inte & TPM_TIS_INT_ENABLED) &&
(tis->loc[locty].inte & irqmask)) {
DPRINTF("tpm_tis: Raising IRQ for flag %08x\n", irqmask);
qemu_irq_raise(s->s.tis.irq);
tis->loc[locty].ints |= irqmask;
}
}
static void tpm_tis_receive_bh(void *opaque)
{
TPMState *s = opaque;
TPMTISEmuState *tis = &s->s.tis;
uint8_t locty = s->locty_number;
tis->loc[locty].sts = TPM_TIS_STS_VALID | TPM_TIS_STS_DATA_AVAILABLE;
tis->loc[locty].state = TPM_TIS_STATE_COMPLETION;
tis->loc[locty].r_offset = 0;
tis->loc[locty].w_offset = 0;
if (TPM_TIS_IS_VALID_LOCTY(tis->next_locty)) {
tpm_tis_abort(s, locty);
}
#ifndef RAISE_STS_IRQ
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_DATA_AVAILABLE);
#else
tpm_tis_raise_irq(s, locty,
TPM_TIS_INT_DATA_AVAILABLE | TPM_TIS_INT_STS_VALID);
#endif
}
/*
* Write a value to a register of the TIS interface
* See specs pages 33-63 for description of the registers
*/
static void tpm_tis_mmio_write_intern(void *opaque, hwaddr addr,
uint64_t val, unsigned size,
bool hw_access)
{
TPMState *s = opaque;
TPMTISEmuState *tis = &s->s.tis;
uint16_t off = addr & 0xffc;
uint8_t shift = (addr & 0x3) * 8;
uint8_t locty = tpm_tis_locality_from_addr(addr);
uint8_t active_locty, l;
int c, set_new_locty = 1;
uint16_t len;
uint32_t mask = (size == 1) ? 0xff : ((size == 2) ? 0xffff : ~0);
DPRINTF("tpm_tis: write.%u(%08x) = %08x\n", size, (int)addr, (int)val);
if (locty == 4 && !hw_access) {
DPRINTF("tpm_tis: Access to locality 4 only allowed from hardware\n");
return;
}
if (tpm_backend_had_startup_error(s->be_driver)) {
return;
}
val &= mask;
if (shift) {
val <<= shift;
mask <<= shift;
}
mask ^= 0xffffffff;
switch (off) {
case TPM_TIS_REG_ACCESS:
if ((val & TPM_TIS_ACCESS_SEIZE)) {
val &= ~(TPM_TIS_ACCESS_REQUEST_USE |
TPM_TIS_ACCESS_ACTIVE_LOCALITY);
}
active_locty = tis->active_locty;
if ((val & TPM_TIS_ACCESS_ACTIVE_LOCALITY)) {
/* give up locality if currently owned */
if (tis->active_locty == locty) {
DPRINTF("tpm_tis: Releasing locality %d\n", locty);
uint8_t newlocty = TPM_TIS_NO_LOCALITY;
/* anybody wants the locality ? */
for (c = TPM_TIS_NUM_LOCALITIES - 1; c >= 0; c--) {
if ((tis->loc[c].access & TPM_TIS_ACCESS_REQUEST_USE)) {
DPRINTF("tpm_tis: Locality %d requests use.\n", c);
newlocty = c;
break;
}
}
DPRINTF("tpm_tis: TPM_TIS_ACCESS_ACTIVE_LOCALITY: "
"Next active locality: %d\n",
newlocty);
if (TPM_TIS_IS_VALID_LOCTY(newlocty)) {
set_new_locty = 0;
tpm_tis_prep_abort(s, locty, newlocty);
} else {
active_locty = TPM_TIS_NO_LOCALITY;
}
} else {
/* not currently the owner; clear a pending request */
tis->loc[locty].access &= ~TPM_TIS_ACCESS_REQUEST_USE;
}
}
if ((val & TPM_TIS_ACCESS_BEEN_SEIZED)) {
tis->loc[locty].access &= ~TPM_TIS_ACCESS_BEEN_SEIZED;
}
if ((val & TPM_TIS_ACCESS_SEIZE)) {
/*
* allow seize if a locality is active and the requesting
* locality is higher than the one that's active
* OR
* allow seize for requesting locality if no locality is
* active
*/
while ((TPM_TIS_IS_VALID_LOCTY(tis->active_locty) &&
locty > tis->active_locty) ||
!TPM_TIS_IS_VALID_LOCTY(tis->active_locty)) {
bool higher_seize = FALSE;
/* already a pending SEIZE ? */
if ((tis->loc[locty].access & TPM_TIS_ACCESS_SEIZE)) {
break;
}
/* check for ongoing seize by a higher locality */
for (l = locty + 1; l < TPM_TIS_NUM_LOCALITIES; l++) {
if ((tis->loc[l].access & TPM_TIS_ACCESS_SEIZE)) {
higher_seize = TRUE;
break;
}
}
if (higher_seize) {
break;
}
/* cancel any seize by a lower locality */
for (l = 0; l < locty - 1; l++) {
tis->loc[l].access &= ~TPM_TIS_ACCESS_SEIZE;
}
tis->loc[locty].access |= TPM_TIS_ACCESS_SEIZE;
DPRINTF("tpm_tis: TPM_TIS_ACCESS_SEIZE: "
"Locality %d seized from locality %d\n",
locty, tis->active_locty);
DPRINTF("tpm_tis: TPM_TIS_ACCESS_SEIZE: Initiating abort.\n");
set_new_locty = 0;
tpm_tis_prep_abort(s, tis->active_locty, locty);
break;
}
}
if ((val & TPM_TIS_ACCESS_REQUEST_USE)) {
if (tis->active_locty != locty) {
if (TPM_TIS_IS_VALID_LOCTY(tis->active_locty)) {
tis->loc[locty].access |= TPM_TIS_ACCESS_REQUEST_USE;
} else {
/* no locality active -> make this one active now */
active_locty = locty;
}
}
}
if (set_new_locty) {
tpm_tis_new_active_locality(s, active_locty);
}
break;
case TPM_TIS_REG_INT_ENABLE:
if (tis->active_locty != locty) {
break;
}
tis->loc[locty].inte &= mask;
tis->loc[locty].inte |= (val & (TPM_TIS_INT_ENABLED |
TPM_TIS_INT_POLARITY_MASK |
TPM_TIS_INTERRUPTS_SUPPORTED));
break;
case TPM_TIS_REG_INT_VECTOR:
/* hard wired -- ignore */
break;
case TPM_TIS_REG_INT_STATUS:
if (tis->active_locty != locty) {
break;
}
/* clearing of interrupt flags */
if (((val & TPM_TIS_INTERRUPTS_SUPPORTED)) &&
(tis->loc[locty].ints & TPM_TIS_INTERRUPTS_SUPPORTED)) {
tis->loc[locty].ints &= ~val;
if (tis->loc[locty].ints == 0) {
qemu_irq_lower(tis->irq);
DPRINTF("tpm_tis: Lowering IRQ\n");
}
}
tis->loc[locty].ints &= ~(val & TPM_TIS_INTERRUPTS_SUPPORTED);
break;
case TPM_TIS_REG_STS:
if (tis->active_locty != locty) {
break;
}
if (s->be_tpm_version == TPM_VERSION_2_0) {
/* some flags that are only supported for TPM 2 */
if (val & TPM_TIS_STS_COMMAND_CANCEL) {
if (tis->loc[locty].state == TPM_TIS_STATE_EXECUTION) {
/*
* request the backend to cancel. Some backends may not
* support it
*/
tpm_backend_cancel_cmd(s->be_driver);
}
}
if (val & TPM_TIS_STS_RESET_ESTABLISHMENT_BIT) {
if (locty == 3 || locty == 4) {
tpm_backend_reset_tpm_established_flag(s->be_driver, locty);
}
}
}
val &= (TPM_TIS_STS_COMMAND_READY | TPM_TIS_STS_TPM_GO |
TPM_TIS_STS_RESPONSE_RETRY);
if (val == TPM_TIS_STS_COMMAND_READY) {
switch (tis->loc[locty].state) {
case TPM_TIS_STATE_READY:
tis->loc[locty].w_offset = 0;
tis->loc[locty].r_offset = 0;
break;
case TPM_TIS_STATE_IDLE:
tpm_tis_sts_set(&tis->loc[locty], TPM_TIS_STS_COMMAND_READY);
tis->loc[locty].state = TPM_TIS_STATE_READY;
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_COMMAND_READY);
break;
case TPM_TIS_STATE_EXECUTION:
case TPM_TIS_STATE_RECEPTION:
/* abort currently running command */
DPRINTF("tpm_tis: %s: Initiating abort.\n",
__func__);
tpm_tis_prep_abort(s, locty, locty);
break;
case TPM_TIS_STATE_COMPLETION:
tis->loc[locty].w_offset = 0;
tis->loc[locty].r_offset = 0;
/* shortcut to ready state with C/R set */
tis->loc[locty].state = TPM_TIS_STATE_READY;
if (!(tis->loc[locty].sts & TPM_TIS_STS_COMMAND_READY)) {
tpm_tis_sts_set(&tis->loc[locty],
TPM_TIS_STS_COMMAND_READY);
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_COMMAND_READY);
}
tis->loc[locty].sts &= ~(TPM_TIS_STS_DATA_AVAILABLE);
break;
}
} else if (val == TPM_TIS_STS_TPM_GO) {
switch (tis->loc[locty].state) {
case TPM_TIS_STATE_RECEPTION:
if ((tis->loc[locty].sts & TPM_TIS_STS_EXPECT) == 0) {
tpm_tis_tpm_send(s, locty);
}
break;
default:
/* ignore */
break;
}
} else if (val == TPM_TIS_STS_RESPONSE_RETRY) {
switch (tis->loc[locty].state) {
case TPM_TIS_STATE_COMPLETION:
tis->loc[locty].r_offset = 0;
tpm_tis_sts_set(&tis->loc[locty],
TPM_TIS_STS_VALID|
TPM_TIS_STS_DATA_AVAILABLE);
break;
default:
/* ignore */
break;
}
}
break;
case TPM_TIS_REG_DATA_FIFO:
case TPM_TIS_REG_DATA_XFIFO ... TPM_TIS_REG_DATA_XFIFO_END:
/* data fifo */
if (tis->active_locty != locty) {
break;
}
if (tis->loc[locty].state == TPM_TIS_STATE_IDLE ||
tis->loc[locty].state == TPM_TIS_STATE_EXECUTION ||
tis->loc[locty].state == TPM_TIS_STATE_COMPLETION) {
/* drop the byte */
} else {
DPRINTF("tpm_tis: Data to send to TPM: %08x (size=%d)\n",
(int)val, size);
if (tis->loc[locty].state == TPM_TIS_STATE_READY) {
tis->loc[locty].state = TPM_TIS_STATE_RECEPTION;
tpm_tis_sts_set(&tis->loc[locty],
TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID);
}
val >>= shift;
if (size > 4 - (addr & 0x3)) {
/* prevent access beyond FIFO */
size = 4 - (addr & 0x3);
}
while ((tis->loc[locty].sts & TPM_TIS_STS_EXPECT) && size > 0) {
if (tis->loc[locty].w_offset < tis->loc[locty].w_buffer.size) {
tis->loc[locty].w_buffer.
buffer[tis->loc[locty].w_offset++] = (uint8_t)val;
val >>= 8;
size--;
} else {
tpm_tis_sts_set(&tis->loc[locty], TPM_TIS_STS_VALID);
}
}
/* check for complete packet */
if (tis->loc[locty].w_offset > 5 &&
(tis->loc[locty].sts & TPM_TIS_STS_EXPECT)) {
/* we have a packet length - see if we have all of it */
#ifdef RAISE_STS_IRQ
bool need_irq = !(tis->loc[locty].sts & TPM_TIS_STS_VALID);
#endif
len = tpm_tis_get_size_from_buffer(&tis->loc[locty].w_buffer);
if (len > tis->loc[locty].w_offset) {
tpm_tis_sts_set(&tis->loc[locty],
TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID);
} else {
/* packet complete */
tpm_tis_sts_set(&tis->loc[locty], TPM_TIS_STS_VALID);
}
#ifdef RAISE_STS_IRQ
if (need_irq) {
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID);
}
#endif
}
}
