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Diffstat (limited to 'tpm/tpm_tis.c')
| -rw-r--r-- | tpm/tpm_tis.c | 930 |
1 files changed, 0 insertions, 930 deletions
diff --git a/tpm/tpm_tis.c b/tpm/tpm_tis.c deleted file mode 100644 index f0a4584607..0000000000 --- a/tpm/tpm_tis.c +++ /dev/null @@ -1,930 +0,0 @@ -/* - * tpm_tis.c - QEMU's TPM TIS interface emulator - * - * Copyright (C) 2006,2010-2013 IBM Corporation - * - * Authors: - * Stefan Berger <stefanb@us.ibm.com> - * David Safford <safford@us.ibm.com> - * - * Xen 4 support: Andrease Niederl <andreas.niederl@iaik.tugraz.at> - * - * This work is licensed under the terms of the GNU GPL, version 2 or later. - * See the COPYING file in the top-level directory. - * - * Implementation of the TIS interface according to specs found at - * http://www.trustedcomputinggroup.org. This implementation currently - * supports version 1.21, revision 1.0. - * In the developers menu choose the PC Client section then find the TIS - * specification. - */ - -#include "backends/tpm.h" -#include "tpm_int.h" -#include "block/block.h" -#include "exec/address-spaces.h" -#include "hw/hw.h" -#include "hw/i386/pc.h" -#include "hw/pci/pci_ids.h" -#include "tpm/tpm_tis.h" -#include "qemu-common.h" - -/*#define DEBUG_TIS */ - -#ifdef DEBUG_TIS -#define DPRINTF(fmt, ...) \ - do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) -#else -#define DPRINTF(fmt, ...) \ - do { } while (0) -#endif - -/* whether the STS interrupt is supported */ -#define RAISE_STS_IRQ - -/* tis registers */ -#define TPM_TIS_REG_ACCESS 0x00 -#define TPM_TIS_REG_INT_ENABLE 0x08 -#define TPM_TIS_REG_INT_VECTOR 0x0c -#define TPM_TIS_REG_INT_STATUS 0x10 -#define TPM_TIS_REG_INTF_CAPABILITY 0x14 -#define TPM_TIS_REG_STS 0x18 -#define TPM_TIS_REG_DATA_FIFO 0x24 -#define TPM_TIS_REG_DID_VID 0xf00 -#define TPM_TIS_REG_RID 0xf04 - -/* vendor-specific registers */ -#define TPM_TIS_REG_DEBUG 0xf90 - -#define TPM_TIS_STS_VALID (1 << 7) -#define TPM_TIS_STS_COMMAND_READY (1 << 6) -#define TPM_TIS_STS_TPM_GO (1 << 5) -#define TPM_TIS_STS_DATA_AVAILABLE (1 << 4) -#define TPM_TIS_STS_EXPECT (1 << 3) -#define TPM_TIS_STS_RESPONSE_RETRY (1 << 1) - -#define TPM_TIS_BURST_COUNT_SHIFT 8 -#define TPM_TIS_BURST_COUNT(X) \ - ((X) << TPM_TIS_BURST_COUNT_SHIFT) - -#define TPM_TIS_ACCESS_TPM_REG_VALID_STS (1 << 7) -#define TPM_TIS_ACCESS_ACTIVE_LOCALITY (1 << 5) -#define TPM_TIS_ACCESS_BEEN_SEIZED (1 << 4) -#define TPM_TIS_ACCESS_SEIZE (1 << 3) -#define TPM_TIS_ACCESS_PENDING_REQUEST (1 << 2) -#define TPM_TIS_ACCESS_REQUEST_USE (1 << 1) -#define TPM_TIS_ACCESS_TPM_ESTABLISHMENT (1 << 0) - -#define TPM_TIS_INT_ENABLED (1 << 31) -#define TPM_TIS_INT_DATA_AVAILABLE (1 << 0) -#define TPM_TIS_INT_STS_VALID (1 << 1) -#define TPM_TIS_INT_LOCALITY_CHANGED (1 << 2) -#define TPM_TIS_INT_COMMAND_READY (1 << 7) - -#define TPM_TIS_INT_POLARITY_MASK (3 << 3) -#define TPM_TIS_INT_POLARITY_LOW_LEVEL (1 << 3) - -#ifndef RAISE_STS_IRQ - -#define TPM_TIS_INTERRUPTS_SUPPORTED (TPM_TIS_INT_LOCALITY_CHANGED | \ - TPM_TIS_INT_DATA_AVAILABLE | \ - TPM_TIS_INT_COMMAND_READY) - -#else - -#define TPM_TIS_INTERRUPTS_SUPPORTED (TPM_TIS_INT_LOCALITY_CHANGED | \ - TPM_TIS_INT_DATA_AVAILABLE | \ - TPM_TIS_INT_STS_VALID | \ - TPM_TIS_INT_COMMAND_READY) - -#endif - -#define TPM_TIS_CAP_INTERRUPT_LOW_LEVEL (1 << 4) /* support is mandatory */ -#define TPM_TIS_CAPABILITIES_SUPPORTED (TPM_TIS_CAP_INTERRUPT_LOW_LEVEL | \ - TPM_TIS_INTERRUPTS_SUPPORTED) - -#define TPM_TIS_TPM_DID 0x0001 -#define TPM_TIS_TPM_VID PCI_VENDOR_ID_IBM -#define TPM_TIS_TPM_RID 0x0001 - -#define TPM_TIS_NO_DATA_BYTE 0xff - -/* local prototypes */ - -static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr, - unsigned size); - -/* utility functions */ - -static uint8_t tpm_tis_locality_from_addr(hwaddr addr) -{ - return (uint8_t)((addr >> TPM_TIS_LOCALITY_SHIFT) & 0x7); -} - -static uint32_t tpm_tis_get_size_from_buffer(const TPMSizedBuffer *sb) -{ - return be32_to_cpu(*(uint32_t *)&sb->buffer[2]); -} - -static void tpm_tis_show_buffer(const TPMSizedBuffer *sb, const char *string) -{ -#ifdef DEBUG_TIS - uint32_t len, i; - - len = tpm_tis_get_size_from_buffer(sb); - DPRINTF("tpm_tis: %s length = %d\n", string, len); - for (i = 0; i < len; i++) { - if (i && !(i % 16)) { - DPRINTF("\n"); - } - DPRINTF("%.2X ", sb->buffer[i]); - } - DPRINTF("\n"); -#endif -} - -/* - * Send a request to the TPM. - */ -static void tpm_tis_tpm_send(TPMState *s, uint8_t locty) -{ - TPMTISEmuState *tis = &s->s.tis; - - tpm_tis_show_buffer(&tis->loc[locty].w_buffer, "tpm_tis: To TPM"); - - s->locty_number = locty; - s->locty_data = &tis->loc[locty]; - - /* - * w_offset serves as length indicator for length of data; - * it's reset when the response comes back - */ - tis->loc[locty].state = TPM_TIS_STATE_EXECUTION; - - tpm_backend_deliver_request(s->be_driver); -} - -/* 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 uint32_t tpm_tis_check_request_use_except(TPMState *s, uint8_t locty) -{ - uint8_t l; - - for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) { - if (l == locty) { - continue; - } - if ((s->s.tis.loc[l].access & TPM_TIS_ACCESS_REQUEST_USE)) { - return 1; - } - } - - return 0; -} - -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); - } -} - -/* abort -- this function switches the locality */ -static void tpm_tis_abort(TPMState *s, uint8_t locty) -{ - TPMTISEmuState *tis = &s->s.tis; - - tis->loc[locty].r_offset = 0; - tis->loc[locty].w_offset = 0; - - DPRINTF("tpm_tis: tis_abort: new active locality is %d\n", tis->next_locty); - - /* - * Need to react differently depending on who's aborting now and - * which locality will become active afterwards. - */ - if (tis->aborting_locty == tis->next_locty) { - tis->loc[tis->aborting_locty].state = TPM_TIS_STATE_READY; - tis->loc[tis->aborting_locty].sts = TPM_TIS_STS_COMMAND_READY; - tpm_tis_raise_irq(s, tis->aborting_locty, TPM_TIS_INT_COMMAND_READY); - } - - /* locality after abort is another one than the current one */ - tpm_tis_new_active_locality(s, tis->next_locty); - - tis->next_locty = TPM_TIS_NO_LOCALITY; - /* nobody's aborting a command anymore */ - tis->aborting_locty = TPM_TIS_NO_LOCALITY; -} - -/* prepare aborting current command */ -static void tpm_tis_prep_abort(TPMState *s, uint8_t locty, uint8_t newlocty) -{ - TPMTISEmuState *tis = &s->s.tis; - uint8_t busy_locty; - - tis->aborting_locty = locty; - tis->next_locty = newlocty; /* locality after successful abort */ - - /* - * only abort a command using an interrupt if currently executing - * a command AND if there's a valid connection to the vTPM. - */ - for (busy_locty = 0; busy_locty < TPM_TIS_NUM_LOCALITIES; busy_locty++) { - if (tis->loc[busy_locty].state == TPM_TIS_STATE_EXECUTION) { - /* - * request the backend to cancel. Some backends may not - * support it - */ - tpm_backend_cancel_cmd(s->be_driver); - return; - } - } - - tpm_tis_abort(s, locty); -} - -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 -} - -/* - * Callback from the TPM to indicate that the response was received. - */ -static void tpm_tis_receive_cb(TPMState *s, uint8_t locty) -{ - TPMTISEmuState *tis = &s->s.tis; - - assert(s->locty_number == locty); - - qemu_bh_schedule(tis->bh); -} - -/* - * Read a byte of response data - */ -static uint32_t tpm_tis_data_read(TPMState *s, uint8_t locty) -{ - TPMTISEmuState *tis = &s->s.tis; - uint32_t ret = TPM_TIS_NO_DATA_BYTE; - uint16_t len; - - if ((tis->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) { - len = tpm_tis_get_size_from_buffer(&tis->loc[locty].r_buffer); - - ret = tis->loc[locty].r_buffer.buffer[tis->loc[locty].r_offset++]; - if (tis->loc[locty].r_offset >= len) { - /* got last byte */ - tis->loc[locty].sts = TPM_TIS_STS_VALID; -#ifdef RAISE_STS_IRQ - tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID); -#endif - } - DPRINTF("tpm_tis: tpm_tis_data_read byte 0x%02x [%d]\n", - ret, tis->loc[locty].r_offset-1); - } - - return ret; -} - -#ifdef DEBUG_TIS -static void tpm_tis_dump_state(void *opaque, hwaddr addr) -{ - static const unsigned regs[] = { - TPM_TIS_REG_ACCESS, - TPM_TIS_REG_INT_ENABLE, - TPM_TIS_REG_INT_VECTOR, - TPM_TIS_REG_INT_STATUS, - TPM_TIS_REG_INTF_CAPABILITY, - TPM_TIS_REG_STS, - TPM_TIS_REG_DID_VID, - TPM_TIS_REG_RID, - 0xfff}; - int idx; - uint8_t locty = tpm_tis_locality_from_addr(addr); - hwaddr base = addr & ~0xfff; - TPMState *s = opaque; - TPMTISEmuState *tis = &s->s.tis; - - DPRINTF("tpm_tis: active locality : %d\n" - "tpm_tis: state of locality %d : %d\n" - "tpm_tis: register dump:\n", - tis->active_locty, - locty, tis->loc[locty].state); - - for (idx = 0; regs[idx] != 0xfff; idx++) { - DPRINTF("tpm_tis: 0x%04x : 0x%08x\n", regs[idx], - (uint32_t)tpm_tis_mmio_read(opaque, base + regs[idx], 4)); - } - - DPRINTF("tpm_tis: read offset : %d\n" - "tpm_tis: result buffer : ", - tis->loc[locty].r_offset); - for (idx = 0; - idx < tpm_tis_get_size_from_buffer(&tis->loc[locty].r_buffer); - idx++) { - DPRINTF("%c%02x%s", - tis->loc[locty].r_offset == idx ? '>' : ' ', - tis->loc[locty].r_buffer.buffer[idx], - ((idx & 0xf) == 0xf) ? "\ntpm_tis: " : ""); - } - DPRINTF("\n" - "tpm_tis: write offset : %d\n" - "tpm_tis: request buffer: ", - tis->loc[locty].w_offset); - for (idx = 0; - idx < tpm_tis_get_size_from_buffer(&tis->loc[locty].w_buffer); - idx++) { - DPRINTF("%c%02x%s", - tis->loc[locty].w_offset == idx ? '>' : ' ', - tis->loc[locty].w_buffer.buffer[idx], - ((idx & 0xf) == 0xf) ? "\ntpm_tis: " : ""); - } - DPRINTF("\n"); -} -#endif - -/* - * Read a register of the TIS interface - * See specs pages 33-63 for description of the registers - */ -static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr, - unsigned size) -{ - TPMState *s = opaque; - TPMTISEmuState *tis = &s->s.tis; - uint16_t offset = addr & 0xffc; - uint8_t shift = (addr & 0x3) * 8; - uint32_t val = 0xffffffff; - uint8_t locty = tpm_tis_locality_from_addr(addr); - uint32_t avail; - - if (tpm_backend_had_startup_error(s->be_driver)) { - return val; - } - - switch (offset) { - case TPM_TIS_REG_ACCESS: - /* never show the SEIZE flag even though we use it internally */ - val = tis->loc[locty].access & ~TPM_TIS_ACCESS_SEIZE; - /* the pending flag is always calculated */ - if (tpm_tis_check_request_use_except(s, locty)) { - val |= TPM_TIS_ACCESS_PENDING_REQUEST; - } - val |= !tpm_backend_get_tpm_established_flag(s->be_driver); - break; - case TPM_TIS_REG_INT_ENABLE: - val = tis->loc[locty].inte; - break; - case TPM_TIS_REG_INT_VECTOR: - val = tis->irq_num; - break; - case TPM_TIS_REG_INT_STATUS: - val = tis->loc[locty].ints; - break; - case TPM_TIS_REG_INTF_CAPABILITY: - val = TPM_TIS_CAPABILITIES_SUPPORTED; - break; - case TPM_TIS_REG_STS: - if (tis->active_locty == locty) { - if ((tis->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) { - val = TPM_TIS_BURST_COUNT( - tpm_tis_get_size_from_buffer(&tis->loc[locty].r_buffer) - - tis->loc[locty].r_offset) | tis->loc[locty].sts; - } else { - avail = tis->loc[locty].w_buffer.size - - tis->loc[locty].w_offset; - /* - * byte-sized reads should not return 0x00 for 0x100 - * available bytes. - */ - if (size == 1 && avail > 0xff) { - avail = 0xff; - } - val = TPM_TIS_BURST_COUNT(avail) | tis->loc[locty].sts; - } - } - break; - case TPM_TIS_REG_DATA_FIFO: - if (tis->active_locty == locty) { - switch (tis->loc[locty].state) { - case TPM_TIS_STATE_COMPLETION: - val = tpm_tis_data_read(s, locty); - break; - default: - val = TPM_TIS_NO_DATA_BYTE; - break; - } - } - break; - case TPM_TIS_REG_DID_VID: - val = (TPM_TIS_TPM_DID << 16) | TPM_TIS_TPM_VID; - break; - case TPM_TIS_REG_RID: - val = TPM_TIS_TPM_RID; - break; -#ifdef DEBUG_TIS - case TPM_TIS_REG_DEBUG: - tpm_tis_dump_state(opaque, addr); - break; -#endif - } - - if (shift) { - val >>= shift; - } - - DPRINTF("tpm_tis: read.%u(%08x) = %08x\n", size, (int)addr, (uint32_t)val); - - return val; -} - -/* - * 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 & 0xfff; - uint8_t locty = tpm_tis_locality_from_addr(addr); - uint8_t active_locty, l; - int c, set_new_locty = 1; - uint16_t len; - - DPRINTF("tpm_tis: write.%u(%08x) = %08x\n", size, (int)addr, (uint32_t)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; - } - - 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 = (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; - } - - 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: - tis->loc[locty].sts = 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)) { - tis->loc[locty].sts = 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; - tis->loc[locty].sts = TPM_TIS_STS_VALID | - TPM_TIS_STS_DATA_AVAILABLE; - break; - default: - /* ignore */ - break; - } - } - break; - case TPM_TIS_REG_DATA_FIFO: - /* 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: Byte to send to TPM: %02x\n", (uint8_t)val); - if (tis->loc[locty].state == TPM_TIS_STATE_READY) { - tis->loc[locty].state = TPM_TIS_STATE_RECEPTION; - tis->loc[locty].sts = TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID; - } - - if ((tis->loc[locty].sts & TPM_TIS_STS_EXPECT)) { - 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; - } else { - tis->loc[locty].sts = 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 needIrq = !(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) { - tis->loc[locty].sts = TPM_TIS_STS_EXPECT | - TPM_TIS_STS_VALID; - } else { - /* packet complete */ - tis->loc[locty].sts = TPM_TIS_STS_VALID; - } -#ifdef RAISE_STS_IRQ - if (needIrq) { - tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID); - } -#endif - } - } - break; - } -} - -static void tpm_tis_mmio_write(void *opaque, hwaddr addr, - uint64_t val, unsigned size) -{ - return tpm_tis_mmio_write_intern(opaque, addr, val, size, false); -} - -static 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, - }, -}; - -static int tpm_tis_do_startup_tpm(TPMState *s) -{ - return tpm_backend_startup_tpm(s->be_driver); -} - -/* - * This function is called when the machine starts, resets or due to - * S3 resume. - */ -static void tpm_tis_reset(DeviceState *dev) -{ - TPMState *s = TPM(dev); - TPMTISEmuState *tis = &s->s.tis; - int c; - - tpm_backend_reset(s->be_driver); - - tis->active_locty = TPM_TIS_NO_LOCALITY; - tis->next_locty = TPM_TIS_NO_LOCALITY; - tis->aborting_locty = TPM_TIS_NO_LOCALITY; - - for (c = 0; c < TPM_TIS_NUM_LOCALITIES; c++) { - tis->loc[c].access = TPM_TIS_ACCESS_TPM_REG_VALID_STS; - tis->loc[c].sts = 0; - tis->loc[c].inte = TPM_TIS_INT_POLARITY_LOW_LEVEL; - tis->loc[c].ints = 0; - tis->loc[c].state = TPM_TIS_STATE_IDLE; - - tis->loc[c].w_offset = 0; - tpm_backend_realloc_buffer(s->be_driver, &tis->loc[c].w_buffer); - tis->loc[c].r_offset = 0; - tpm_backend_realloc_buffer(s->be_driver, &tis->loc[c].r_buffer); - } - - tpm_tis_do_startup_tpm(s); -} - -static const VMStateDescription vmstate_tpm_tis = { - .name = "tpm", - .unmigratable = 1, -}; - -static Property tpm_tis_properties[] = { - DEFINE_PROP_UINT32("irq", TPMState, - s.tis.irq_num, TPM_TIS_IRQ), - DEFINE_PROP_STRING("tpmdev", TPMState, backend), - DEFINE_PROP_END_OF_LIST(), -}; - -static void tpm_tis_realizefn(DeviceState *dev, Error **errp) -{ - TPMState *s = TPM(dev); - TPMTISEmuState *tis = &s->s.tis; - - s->be_driver = qemu_find_tpm(s->backend); - if (!s->be_driver) { - error_setg(errp, "tpm_tis: backend driver with id %s could not be " - "found", s->backend); - return; - } - - s->be_driver->fe_model = TPM_MODEL_TPM_TIS; - - if (tpm_backend_init(s->be_driver, s, tpm_tis_receive_cb)) { - error_setg(errp, "tpm_tis: backend driver with id %s could not be " - "initialized", s->backend); - return; - } - - if (tis->irq_num > 15) { - error_setg(errp, "tpm_tis: IRQ %d for TPM TIS is outside valid range " - "of 0 to 15.\n", tis->irq_num); - return; - } - - tis->bh = qemu_bh_new(tpm_tis_receive_bh, s); - - isa_init_irq(&s->busdev, &tis->irq, tis->irq_num); -} - -static void tpm_tis_initfn(Object *obj) -{ - ISADevice *dev = ISA_DEVICE(obj); - TPMState *s = TPM(obj); - - memory_region_init_io(&s->mmio, &tpm_tis_memory_ops, s, "tpm-tis-mmio", - TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT); - memory_region_add_subregion(isa_address_space(dev), TPM_TIS_ADDR_BASE, - &s->mmio); -} - -static void tpm_tis_uninitfn(Object *obj) -{ - TPMState *s = TPM(obj); - - memory_region_del_subregion(get_system_memory(), &s->mmio); - memory_region_destroy(&s->mmio); -} - -static void tpm_tis_class_init(ObjectClass *klass, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(klass); - - dc->realize = tpm_tis_realizefn; - dc->props = tpm_tis_properties; - dc->reset = tpm_tis_reset; - dc->vmsd = &vmstate_tpm_tis; -} - -static const TypeInfo tpm_tis_info = { - .name = TYPE_TPM_TIS, - .parent = TYPE_ISA_DEVICE, - .instance_size = sizeof(TPMState), - .instance_init = tpm_tis_initfn, - .instance_finalize = tpm_tis_uninitfn, - .class_init = tpm_tis_class_init, -}; - -static void tpm_tis_register(void) -{ - type_register_static(&tpm_tis_info); - tpm_register_model(TPM_MODEL_TPM_TIS); -} - -type_init(tpm_tis_register) |