873 lines
26 KiB
C
873 lines
26 KiB
C
/*
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* tpm_tis_common.c - QEMU's TPM TIS interface emulator
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* device agnostic functions
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*
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* Copyright (C) 2006,2010-2013 IBM Corporation
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*
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* Authors:
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* Stefan Berger <stefanb@us.ibm.com>
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* David Safford <safford@us.ibm.com>
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*
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* Xen 4 support: Andrease Niederl <andreas.niederl@iaik.tugraz.at>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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* Implementation of the TIS interface according to specs found at
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* http://www.trustedcomputinggroup.org. This implementation currently
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* supports version 1.3, 21 March 2013
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* In the developers menu choose the PC Client section then find the TIS
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* specification.
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*
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* TPM TIS for TPM 2 implementation following TCG PC Client Platform
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* TPM Profile (PTP) Specification, Familiy 2.0, Revision 00.43
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*/
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#include "qemu/osdep.h"
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#include "hw/irq.h"
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#include "hw/isa/isa.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "hw/acpi/tpm.h"
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#include "hw/pci/pci_ids.h"
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#include "hw/qdev-properties.h"
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#include "migration/vmstate.h"
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#include "sysemu/tpm_backend.h"
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#include "sysemu/tpm_util.h"
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#include "tpm_ppi.h"
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#include "trace.h"
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#include "tpm_tis.h"
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#define DEBUG_TIS 0
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/* local prototypes */
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static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr,
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unsigned size);
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/* utility functions */
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static uint8_t tpm_tis_locality_from_addr(hwaddr addr)
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{
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uint8_t locty;
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locty = (uint8_t)((addr >> TPM_TIS_LOCALITY_SHIFT) & 0x7);
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assert(TPM_TIS_IS_VALID_LOCTY(locty));
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return locty;
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}
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/*
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* Set the given flags in the STS register by clearing the register but
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* preserving the SELFTEST_DONE and TPM_FAMILY_MASK flags and then setting
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* the new flags.
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*
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* The SELFTEST_DONE flag is acquired from the backend that determines it by
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* peeking into TPM commands.
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*
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* A VM suspend/resume will preserve the flag by storing it into the VM
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* device state, but the backend will not remember it when QEMU is started
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* again. Therefore, we cache the flag here. Once set, it will not be unset
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* except by a reset.
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*/
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static void tpm_tis_sts_set(TPMLocality *l, uint32_t flags)
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{
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l->sts &= TPM_TIS_STS_SELFTEST_DONE | TPM_TIS_STS_TPM_FAMILY_MASK;
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l->sts |= flags;
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}
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/*
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* Send a request to the TPM.
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*/
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static void tpm_tis_tpm_send(TPMState *s, uint8_t locty)
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{
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tpm_util_show_buffer(s->buffer, s->be_buffer_size, "To TPM");
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/*
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* rw_offset serves as length indicator for length of data;
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* it's reset when the response comes back
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*/
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s->loc[locty].state = TPM_TIS_STATE_EXECUTION;
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s->cmd = (TPMBackendCmd) {
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.locty = locty,
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.in = s->buffer,
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.in_len = s->rw_offset,
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.out = s->buffer,
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.out_len = s->be_buffer_size,
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};
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tpm_backend_deliver_request(s->be_driver, &s->cmd);
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}
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/* raise an interrupt if allowed */
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static void tpm_tis_raise_irq(TPMState *s, uint8_t locty, uint32_t irqmask)
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{
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if (!TPM_TIS_IS_VALID_LOCTY(locty)) {
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return;
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}
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if ((s->loc[locty].inte & TPM_TIS_INT_ENABLED) &&
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(s->loc[locty].inte & irqmask)) {
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trace_tpm_tis_raise_irq(irqmask);
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qemu_irq_raise(s->irq);
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s->loc[locty].ints |= irqmask;
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}
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}
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static uint32_t tpm_tis_check_request_use_except(TPMState *s, uint8_t locty)
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{
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uint8_t l;
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for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) {
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if (l == locty) {
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continue;
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}
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if ((s->loc[l].access & TPM_TIS_ACCESS_REQUEST_USE)) {
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return 1;
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}
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}
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return 0;
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}
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static void tpm_tis_new_active_locality(TPMState *s, uint8_t new_active_locty)
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{
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bool change = (s->active_locty != new_active_locty);
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bool is_seize;
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uint8_t mask;
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if (change && TPM_TIS_IS_VALID_LOCTY(s->active_locty)) {
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is_seize = TPM_TIS_IS_VALID_LOCTY(new_active_locty) &&
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s->loc[new_active_locty].access & TPM_TIS_ACCESS_SEIZE;
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if (is_seize) {
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mask = ~(TPM_TIS_ACCESS_ACTIVE_LOCALITY);
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} else {
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mask = ~(TPM_TIS_ACCESS_ACTIVE_LOCALITY|
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TPM_TIS_ACCESS_REQUEST_USE);
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}
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/* reset flags on the old active locality */
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s->loc[s->active_locty].access &= mask;
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if (is_seize) {
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s->loc[s->active_locty].access |= TPM_TIS_ACCESS_BEEN_SEIZED;
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}
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}
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s->active_locty = new_active_locty;
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trace_tpm_tis_new_active_locality(s->active_locty);
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if (TPM_TIS_IS_VALID_LOCTY(new_active_locty)) {
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/* set flags on the new active locality */
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s->loc[new_active_locty].access |= TPM_TIS_ACCESS_ACTIVE_LOCALITY;
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s->loc[new_active_locty].access &= ~(TPM_TIS_ACCESS_REQUEST_USE |
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TPM_TIS_ACCESS_SEIZE);
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}
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if (change) {
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tpm_tis_raise_irq(s, s->active_locty, TPM_TIS_INT_LOCALITY_CHANGED);
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}
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}
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/* abort -- this function switches the locality */
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static void tpm_tis_abort(TPMState *s)
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{
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s->rw_offset = 0;
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trace_tpm_tis_abort(s->next_locty);
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/*
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* Need to react differently depending on who's aborting now and
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* which locality will become active afterwards.
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*/
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if (s->aborting_locty == s->next_locty) {
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s->loc[s->aborting_locty].state = TPM_TIS_STATE_READY;
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tpm_tis_sts_set(&s->loc[s->aborting_locty],
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TPM_TIS_STS_COMMAND_READY);
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tpm_tis_raise_irq(s, s->aborting_locty, TPM_TIS_INT_COMMAND_READY);
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}
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/* locality after abort is another one than the current one */
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tpm_tis_new_active_locality(s, s->next_locty);
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s->next_locty = TPM_TIS_NO_LOCALITY;
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/* nobody's aborting a command anymore */
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s->aborting_locty = TPM_TIS_NO_LOCALITY;
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}
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/* prepare aborting current command */
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static void tpm_tis_prep_abort(TPMState *s, uint8_t locty, uint8_t newlocty)
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{
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uint8_t busy_locty;
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assert(TPM_TIS_IS_VALID_LOCTY(newlocty));
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s->aborting_locty = locty; /* may also be TPM_TIS_NO_LOCALITY */
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s->next_locty = newlocty; /* locality after successful abort */
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/*
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* only abort a command using an interrupt if currently executing
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* a command AND if there's a valid connection to the vTPM.
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*/
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for (busy_locty = 0; busy_locty < TPM_TIS_NUM_LOCALITIES; busy_locty++) {
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if (s->loc[busy_locty].state == TPM_TIS_STATE_EXECUTION) {
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/*
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* request the backend to cancel. Some backends may not
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* support it
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*/
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tpm_backend_cancel_cmd(s->be_driver);
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return;
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}
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}
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tpm_tis_abort(s);
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}
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/*
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* Callback from the TPM to indicate that the response was received.
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*/
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void tpm_tis_request_completed(TPMState *s, int ret)
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{
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uint8_t locty = s->cmd.locty;
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uint8_t l;
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assert(TPM_TIS_IS_VALID_LOCTY(locty));
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if (s->cmd.selftest_done) {
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for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) {
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s->loc[l].sts |= TPM_TIS_STS_SELFTEST_DONE;
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}
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}
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/* FIXME: report error if ret != 0 */
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tpm_tis_sts_set(&s->loc[locty],
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TPM_TIS_STS_VALID | TPM_TIS_STS_DATA_AVAILABLE);
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s->loc[locty].state = TPM_TIS_STATE_COMPLETION;
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s->rw_offset = 0;
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tpm_util_show_buffer(s->buffer, s->be_buffer_size, "From TPM");
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if (TPM_TIS_IS_VALID_LOCTY(s->next_locty)) {
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tpm_tis_abort(s);
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}
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tpm_tis_raise_irq(s, locty,
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TPM_TIS_INT_DATA_AVAILABLE | TPM_TIS_INT_STS_VALID);
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}
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/*
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* Read a byte of response data
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*/
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static uint32_t tpm_tis_data_read(TPMState *s, uint8_t locty)
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{
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uint32_t ret = TPM_TIS_NO_DATA_BYTE;
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uint16_t len;
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if ((s->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) {
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len = MIN(tpm_cmd_get_size(&s->buffer),
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s->be_buffer_size);
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ret = s->buffer[s->rw_offset++];
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if (s->rw_offset >= len) {
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/* got last byte */
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tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID);
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tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID);
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}
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trace_tpm_tis_data_read(ret, s->rw_offset - 1);
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}
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return ret;
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}
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#ifdef DEBUG_TIS
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static void tpm_tis_dump_state(TPMState *s, hwaddr addr)
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{
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static const unsigned regs[] = {
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TPM_TIS_REG_ACCESS,
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TPM_TIS_REG_INT_ENABLE,
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TPM_TIS_REG_INT_VECTOR,
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TPM_TIS_REG_INT_STATUS,
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TPM_TIS_REG_INTF_CAPABILITY,
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TPM_TIS_REG_STS,
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TPM_TIS_REG_DID_VID,
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TPM_TIS_REG_RID,
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0xfff};
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int idx;
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uint8_t locty = tpm_tis_locality_from_addr(addr);
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hwaddr base = addr & ~0xfff;
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printf("tpm_tis: active locality : %d\n"
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"tpm_tis: state of locality %d : %d\n"
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"tpm_tis: register dump:\n",
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s->active_locty,
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locty, s->loc[locty].state);
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for (idx = 0; regs[idx] != 0xfff; idx++) {
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printf("tpm_tis: 0x%04x : 0x%08x\n", regs[idx],
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(int)tpm_tis_mmio_read(s, base + regs[idx], 4));
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}
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printf("tpm_tis: r/w offset : %d\n"
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"tpm_tis: result buffer : ",
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s->rw_offset);
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for (idx = 0;
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idx < MIN(tpm_cmd_get_size(&s->buffer), s->be_buffer_size);
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idx++) {
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printf("%c%02x%s",
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s->rw_offset == idx ? '>' : ' ',
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s->buffer[idx],
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((idx & 0xf) == 0xf) ? "\ntpm_tis: " : "");
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}
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printf("\n");
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}
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#endif
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/*
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* Read a register of the TIS interface
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* See specs pages 33-63 for description of the registers
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*/
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static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr,
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unsigned size)
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{
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TPMState *s = opaque;
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uint16_t offset = addr & 0xffc;
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uint8_t shift = (addr & 0x3) * 8;
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uint32_t val = 0xffffffff;
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uint8_t locty = tpm_tis_locality_from_addr(addr);
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uint32_t avail;
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uint8_t v;
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if (tpm_backend_had_startup_error(s->be_driver)) {
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return 0;
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}
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switch (offset) {
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case TPM_TIS_REG_ACCESS:
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/* never show the SEIZE flag even though we use it internally */
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val = s->loc[locty].access & ~TPM_TIS_ACCESS_SEIZE;
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/* the pending flag is always calculated */
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if (tpm_tis_check_request_use_except(s, locty)) {
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val |= TPM_TIS_ACCESS_PENDING_REQUEST;
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}
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val |= !tpm_backend_get_tpm_established_flag(s->be_driver);
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break;
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case TPM_TIS_REG_INT_ENABLE:
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val = s->loc[locty].inte;
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break;
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case TPM_TIS_REG_INT_VECTOR:
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val = s->irq_num;
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break;
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case TPM_TIS_REG_INT_STATUS:
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val = s->loc[locty].ints;
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break;
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case TPM_TIS_REG_INTF_CAPABILITY:
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switch (s->be_tpm_version) {
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case TPM_VERSION_UNSPEC:
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val = 0;
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break;
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case TPM_VERSION_1_2:
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val = TPM_TIS_CAPABILITIES_SUPPORTED1_3;
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break;
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case TPM_VERSION_2_0:
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val = TPM_TIS_CAPABILITIES_SUPPORTED2_0;
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break;
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}
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break;
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case TPM_TIS_REG_STS:
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if (s->active_locty == locty) {
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if ((s->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) {
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val = TPM_TIS_BURST_COUNT(
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MIN(tpm_cmd_get_size(&s->buffer),
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s->be_buffer_size)
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- s->rw_offset) | s->loc[locty].sts;
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} else {
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avail = s->be_buffer_size - s->rw_offset;
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/*
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* byte-sized reads should not return 0x00 for 0x100
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* available bytes.
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*/
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if (size == 1 && avail > 0xff) {
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avail = 0xff;
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}
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val = TPM_TIS_BURST_COUNT(avail) | s->loc[locty].sts;
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}
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}
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break;
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case TPM_TIS_REG_DATA_FIFO:
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case TPM_TIS_REG_DATA_XFIFO ... TPM_TIS_REG_DATA_XFIFO_END:
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if (s->active_locty == locty) {
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if (size > 4 - (addr & 0x3)) {
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/* prevent access beyond FIFO */
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size = 4 - (addr & 0x3);
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}
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val = 0;
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shift = 0;
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while (size > 0) {
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switch (s->loc[locty].state) {
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case TPM_TIS_STATE_COMPLETION:
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v = tpm_tis_data_read(s, locty);
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break;
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default:
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v = TPM_TIS_NO_DATA_BYTE;
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break;
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}
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val |= (v << shift);
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shift += 8;
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size--;
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}
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shift = 0; /* no more adjustments */
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}
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break;
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case TPM_TIS_REG_INTERFACE_ID:
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val = s->loc[locty].iface_id;
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break;
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case TPM_TIS_REG_DID_VID:
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val = (TPM_TIS_TPM_DID << 16) | TPM_TIS_TPM_VID;
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break;
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case TPM_TIS_REG_RID:
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val = TPM_TIS_TPM_RID;
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break;
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#ifdef DEBUG_TIS
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case TPM_TIS_REG_DEBUG:
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tpm_tis_dump_state(s, addr);
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break;
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#endif
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}
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if (shift) {
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val >>= shift;
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}
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trace_tpm_tis_mmio_read(size, addr, val);
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return val;
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}
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/*
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* Write a value to a register of the TIS interface
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* See specs pages 33-63 for description of the registers
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*/
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static void tpm_tis_mmio_write(void *opaque, hwaddr addr,
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uint64_t val, unsigned size)
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{
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TPMState *s = opaque;
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uint16_t off = addr & 0xffc;
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uint8_t shift = (addr & 0x3) * 8;
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uint8_t locty = tpm_tis_locality_from_addr(addr);
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uint8_t active_locty, l;
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int c, set_new_locty = 1;
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uint16_t len;
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uint32_t mask = (size == 1) ? 0xff : ((size == 2) ? 0xffff : ~0);
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trace_tpm_tis_mmio_write(size, addr, val);
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if (locty == 4) {
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trace_tpm_tis_mmio_write_locty4();
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return;
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}
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if (tpm_backend_had_startup_error(s->be_driver)) {
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return;
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}
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val &= mask;
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if (shift) {
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val <<= shift;
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mask <<= shift;
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}
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|
|
|
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 = s->active_locty;
|
|
|
|
if ((val & TPM_TIS_ACCESS_ACTIVE_LOCALITY)) {
|
|
/* give up locality if currently owned */
|
|
if (s->active_locty == locty) {
|
|
trace_tpm_tis_mmio_write_release_locty(locty);
|
|
|
|
uint8_t newlocty = TPM_TIS_NO_LOCALITY;
|
|
/* anybody wants the locality ? */
|
|
for (c = TPM_TIS_NUM_LOCALITIES - 1; c >= 0; c--) {
|
|
if ((s->loc[c].access & TPM_TIS_ACCESS_REQUEST_USE)) {
|
|
trace_tpm_tis_mmio_write_locty_req_use(c);
|
|
newlocty = c;
|
|
break;
|
|
}
|
|
}
|
|
trace_tpm_tis_mmio_write_next_locty(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 */
|
|
s->loc[locty].access &= ~TPM_TIS_ACCESS_REQUEST_USE;
|
|
}
|
|
}
|
|
|
|
if ((val & TPM_TIS_ACCESS_BEEN_SEIZED)) {
|
|
s->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(s->active_locty) &&
|
|
locty > s->active_locty) ||
|
|
!TPM_TIS_IS_VALID_LOCTY(s->active_locty)) {
|
|
bool higher_seize = false;
|
|
|
|
/* already a pending SEIZE ? */
|
|
if ((s->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 ((s->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; l++) {
|
|
s->loc[l].access &= ~TPM_TIS_ACCESS_SEIZE;
|
|
}
|
|
|
|
s->loc[locty].access |= TPM_TIS_ACCESS_SEIZE;
|
|
|
|
trace_tpm_tis_mmio_write_locty_seized(locty, s->active_locty);
|
|
trace_tpm_tis_mmio_write_init_abort();
|
|
|
|
set_new_locty = 0;
|
|
tpm_tis_prep_abort(s, s->active_locty, locty);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((val & TPM_TIS_ACCESS_REQUEST_USE)) {
|
|
if (s->active_locty != locty) {
|
|
if (TPM_TIS_IS_VALID_LOCTY(s->active_locty)) {
|
|
s->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 (s->active_locty != locty) {
|
|
break;
|
|
}
|
|
|
|
s->loc[locty].inte &= mask;
|
|
s->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 (s->active_locty != locty) {
|
|
break;
|
|
}
|
|
|
|
/* clearing of interrupt flags */
|
|
if (((val & TPM_TIS_INTERRUPTS_SUPPORTED)) &&
|
|
(s->loc[locty].ints & TPM_TIS_INTERRUPTS_SUPPORTED)) {
|
|
s->loc[locty].ints &= ~val;
|
|
if (s->loc[locty].ints == 0) {
|
|
qemu_irq_lower(s->irq);
|
|
trace_tpm_tis_mmio_write_lowering_irq();
|
|
}
|
|
}
|
|
s->loc[locty].ints &= ~(val & TPM_TIS_INTERRUPTS_SUPPORTED);
|
|
break;
|
|
case TPM_TIS_REG_STS:
|
|
if (s->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 (s->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 (s->loc[locty].state) {
|
|
|
|
case TPM_TIS_STATE_READY:
|
|
s->rw_offset = 0;
|
|
break;
|
|
|
|
case TPM_TIS_STATE_IDLE:
|
|
tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_COMMAND_READY);
|
|
s->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 */
|
|
trace_tpm_tis_mmio_write_init_abort();
|
|
tpm_tis_prep_abort(s, locty, locty);
|
|
break;
|
|
|
|
case TPM_TIS_STATE_COMPLETION:
|
|
s->rw_offset = 0;
|
|
/* shortcut to ready state with C/R set */
|
|
s->loc[locty].state = TPM_TIS_STATE_READY;
|
|
if (!(s->loc[locty].sts & TPM_TIS_STS_COMMAND_READY)) {
|
|
tpm_tis_sts_set(&s->loc[locty],
|
|
TPM_TIS_STS_COMMAND_READY);
|
|
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_COMMAND_READY);
|
|
}
|
|
s->loc[locty].sts &= ~(TPM_TIS_STS_DATA_AVAILABLE);
|
|
break;
|
|
|
|
}
|
|
} else if (val == TPM_TIS_STS_TPM_GO) {
|
|
switch (s->loc[locty].state) {
|
|
case TPM_TIS_STATE_RECEPTION:
|
|
if ((s->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 (s->loc[locty].state) {
|
|
case TPM_TIS_STATE_COMPLETION:
|
|
s->rw_offset = 0;
|
|
tpm_tis_sts_set(&s->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 (s->active_locty != locty) {
|
|
break;
|
|
}
|
|
|
|
if (s->loc[locty].state == TPM_TIS_STATE_IDLE ||
|
|
s->loc[locty].state == TPM_TIS_STATE_EXECUTION ||
|
|
s->loc[locty].state == TPM_TIS_STATE_COMPLETION) {
|
|
/* drop the byte */
|
|
} else {
|
|
trace_tpm_tis_mmio_write_data2send(val, size);
|
|
if (s->loc[locty].state == TPM_TIS_STATE_READY) {
|
|
s->loc[locty].state = TPM_TIS_STATE_RECEPTION;
|
|
tpm_tis_sts_set(&s->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 ((s->loc[locty].sts & TPM_TIS_STS_EXPECT) && size > 0) {
|
|
if (s->rw_offset < s->be_buffer_size) {
|
|
s->buffer[s->rw_offset++] =
|
|
(uint8_t)val;
|
|
val >>= 8;
|
|
size--;
|
|
} else {
|
|
tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID);
|
|
}
|
|
}
|
|
|
|
/* check for complete packet */
|
|
if (s->rw_offset > 5 &&
|
|
(s->loc[locty].sts & TPM_TIS_STS_EXPECT)) {
|
|
/* we have a packet length - see if we have all of it */
|
|
bool need_irq = !(s->loc[locty].sts & TPM_TIS_STS_VALID);
|
|
|
|
len = tpm_cmd_get_size(&s->buffer);
|
|
if (len > s->rw_offset) {
|
|
tpm_tis_sts_set(&s->loc[locty],
|
|
TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID);
|
|
} else {
|
|
/* packet complete */
|
|
tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID);
|
|
}
|
|
if (need_irq) {
|
|
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case TPM_TIS_REG_INTERFACE_ID:
|
|
if (val & TPM_TIS_IFACE_ID_INT_SEL_LOCK) {
|
|
for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) {
|
|
s->loc[l].iface_id |= TPM_TIS_IFACE_ID_INT_SEL_LOCK;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
const MemoryRegionOps tpm_tis_memory_ops = {
|
|
.read = tpm_tis_mmio_read,
|
|
.write = tpm_tis_mmio_write,
|
|
.endianness = DEVICE_LITTLE_ENDIAN,
|
|
.valid = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 4,
|
|
},
|
|
};
|
|
|
|
/*
|
|
* Get the TPMVersion of the backend device being used
|
|
*/
|
|
enum TPMVersion tpm_tis_get_tpm_version(TPMState *s)
|
|
{
|
|
if (tpm_backend_had_startup_error(s->be_driver)) {
|
|
return TPM_VERSION_UNSPEC;
|
|
}
|
|
|
|
return tpm_backend_get_tpm_version(s->be_driver);
|
|
}
|
|
|
|
/*
|
|
* This function is called when the machine starts, resets or due to
|
|
* S3 resume.
|
|
*/
|
|
void tpm_tis_reset(TPMState *s)
|
|
{
|
|
int c;
|
|
|
|
s->be_tpm_version = tpm_backend_get_tpm_version(s->be_driver);
|
|
s->be_buffer_size = MIN(tpm_backend_get_buffer_size(s->be_driver),
|
|
TPM_TIS_BUFFER_MAX);
|
|
|
|
if (s->ppi_enabled) {
|
|
tpm_ppi_reset(&s->ppi);
|
|
}
|
|
tpm_backend_reset(s->be_driver);
|
|
|
|
s->active_locty = TPM_TIS_NO_LOCALITY;
|
|
s->next_locty = TPM_TIS_NO_LOCALITY;
|
|
s->aborting_locty = TPM_TIS_NO_LOCALITY;
|
|
|
|
for (c = 0; c < TPM_TIS_NUM_LOCALITIES; c++) {
|
|
s->loc[c].access = TPM_TIS_ACCESS_TPM_REG_VALID_STS;
|
|
switch (s->be_tpm_version) {
|
|
case TPM_VERSION_UNSPEC:
|
|
break;
|
|
case TPM_VERSION_1_2:
|
|
s->loc[c].sts = TPM_TIS_STS_TPM_FAMILY1_2;
|
|
s->loc[c].iface_id = TPM_TIS_IFACE_ID_SUPPORTED_FLAGS1_3;
|
|
break;
|
|
case TPM_VERSION_2_0:
|
|
s->loc[c].sts = TPM_TIS_STS_TPM_FAMILY2_0;
|
|
s->loc[c].iface_id = TPM_TIS_IFACE_ID_SUPPORTED_FLAGS2_0;
|
|
break;
|
|
}
|
|
s->loc[c].inte = TPM_TIS_INT_POLARITY_LOW_LEVEL;
|
|
s->loc[c].ints = 0;
|
|
s->loc[c].state = TPM_TIS_STATE_IDLE;
|
|
|
|
s->rw_offset = 0;
|
|
}
|
|
|
|
if (tpm_backend_startup_tpm(s->be_driver, s->be_buffer_size) < 0) {
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/* persistent state handling */
|
|
|
|
int tpm_tis_pre_save(TPMState *s)
|
|
{
|
|
uint8_t locty = s->active_locty;
|
|
|
|
trace_tpm_tis_pre_save(locty, s->rw_offset);
|
|
|
|
if (DEBUG_TIS) {
|
|
tpm_tis_dump_state(s, 0);
|
|
}
|
|
|
|
/*
|
|
* Synchronize with backend completion.
|
|
*/
|
|
tpm_backend_finish_sync(s->be_driver);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const VMStateDescription vmstate_locty = {
|
|
.name = "tpm-tis/locty",
|
|
.version_id = 0,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT32(state, TPMLocality),
|
|
VMSTATE_UINT32(inte, TPMLocality),
|
|
VMSTATE_UINT32(ints, TPMLocality),
|
|
VMSTATE_UINT8(access, TPMLocality),
|
|
VMSTATE_UINT32(sts, TPMLocality),
|
|
VMSTATE_UINT32(iface_id, TPMLocality),
|
|
VMSTATE_END_OF_LIST(),
|
|
}
|
|
};
|
|
|