diff options
Diffstat (limited to 'qemu/roms/seabios/src/hw/tpm_drivers.c')
| -rw-r--r-- | qemu/roms/seabios/src/hw/tpm_drivers.c | 291 |
1 files changed, 0 insertions, 291 deletions
diff --git a/qemu/roms/seabios/src/hw/tpm_drivers.c b/qemu/roms/seabios/src/hw/tpm_drivers.c deleted file mode 100644 index 444eac39b..000000000 --- a/qemu/roms/seabios/src/hw/tpm_drivers.c +++ /dev/null @@ -1,291 +0,0 @@ -// Implementation of a TPM driver for the TPM TIS interface -// -// Copyright (C) 2006-2011 IBM Corporation -// -// Authors: -// Stefan Berger <stefanb@linux.vnet.ibm.com> -// -// This file may be distributed under the terms of the GNU LGPLv3 license. - -#include "config.h" // CONFIG_TPM_TIS_SHA1THRESHOLD -#include "string.h" // memcpy -#include "util.h" // msleep -#include "x86.h" // readl -#include "hw/tpm_drivers.h" // struct tpm_driver -#include "tcgbios.h" // TCG_* - -static const u32 tis_default_timeouts[4] = { - TIS_DEFAULT_TIMEOUT_A, - TIS_DEFAULT_TIMEOUT_B, - TIS_DEFAULT_TIMEOUT_C, - TIS_DEFAULT_TIMEOUT_D, -}; - -static const u32 tpm_default_durations[3] = { - TPM_DEFAULT_DURATION_SHORT, - TPM_DEFAULT_DURATION_MEDIUM, - TPM_DEFAULT_DURATION_LONG, -}; - -/* determined values */ -static u32 tpm_default_dur[3]; -static u32 tpm_default_to[4]; - - -/* if device is not there, return '0', '1' otherwise */ -static u32 tis_probe(void) -{ - if (!CONFIG_TCGBIOS) - return 0; - - u32 rc = 0; - u32 didvid = readl(TIS_REG(0, TIS_REG_DID_VID)); - - if ((didvid != 0) && (didvid != 0xffffffff)) - rc = 1; - - return rc; -} - -static u32 tis_init(void) -{ - if (!CONFIG_TCGBIOS) - return 1; - - writeb(TIS_REG(0, TIS_REG_INT_ENABLE), 0); - - if (tpm_drivers[TIS_DRIVER_IDX].durations == NULL) { - u32 *durations = tpm_default_dur; - memcpy(durations, tpm_default_durations, - sizeof(tpm_default_durations)); - tpm_drivers[TIS_DRIVER_IDX].durations = durations; - } - - if (tpm_drivers[TIS_DRIVER_IDX].timeouts == NULL) { - u32 *timeouts = tpm_default_to; - memcpy(timeouts, tis_default_timeouts, - sizeof(tis_default_timeouts)); - tpm_drivers[TIS_DRIVER_IDX].timeouts = timeouts; - } - - return 1; -} - - -static void set_timeouts(u32 timeouts[4], u32 durations[3]) -{ - if (!CONFIG_TCGBIOS) - return; - - u32 *tos = tpm_drivers[TIS_DRIVER_IDX].timeouts; - u32 *dus = tpm_drivers[TIS_DRIVER_IDX].durations; - - if (tos && tos != tis_default_timeouts && timeouts) - memcpy(tos, timeouts, 4 * sizeof(u32)); - if (dus && dus != tpm_default_durations && durations) - memcpy(dus, durations, 3 * sizeof(u32)); -} - - -static u32 tis_wait_sts(u8 locty, u32 time, u8 mask, u8 expect) -{ - if (!CONFIG_TCGBIOS) - return 0; - - u32 rc = 1; - - while (time > 0) { - u8 sts = readb(TIS_REG(locty, TIS_REG_STS)); - if ((sts & mask) == expect) { - rc = 0; - break; - } - msleep(1); - time--; - } - return rc; -} - -static u32 tis_activate(u8 locty) -{ - if (!CONFIG_TCGBIOS) - return 0; - - u32 rc = 0; - u8 acc; - int l; - u32 timeout_a = tpm_drivers[TIS_DRIVER_IDX].timeouts[TIS_TIMEOUT_TYPE_A]; - - if (!(readb(TIS_REG(locty, TIS_REG_ACCESS)) & - TIS_ACCESS_ACTIVE_LOCALITY)) { - /* release locality in use top-downwards */ - for (l = 4; l >= 0; l--) - writeb(TIS_REG(l, TIS_REG_ACCESS), - TIS_ACCESS_ACTIVE_LOCALITY); - } - - /* request access to locality */ - writeb(TIS_REG(locty, TIS_REG_ACCESS), TIS_ACCESS_REQUEST_USE); - - acc = readb(TIS_REG(locty, TIS_REG_ACCESS)); - if ((acc & TIS_ACCESS_ACTIVE_LOCALITY)) { - writeb(TIS_REG(locty, TIS_REG_STS), TIS_STS_COMMAND_READY); - rc = tis_wait_sts(locty, timeout_a, - TIS_STS_COMMAND_READY, TIS_STS_COMMAND_READY); - } - - return rc; -} - -static u32 tis_find_active_locality(void) -{ - if (!CONFIG_TCGBIOS) - return 0; - - u8 locty; - - for (locty = 0; locty <= 4; locty++) { - if ((readb(TIS_REG(locty, TIS_REG_ACCESS)) & - TIS_ACCESS_ACTIVE_LOCALITY)) - return locty; - } - - tis_activate(0); - - return 0; -} - -static u32 tis_ready(void) -{ - if (!CONFIG_TCGBIOS) - return 0; - - u32 rc = 0; - u8 locty = tis_find_active_locality(); - u32 timeout_b = tpm_drivers[TIS_DRIVER_IDX].timeouts[TIS_TIMEOUT_TYPE_B]; - - writeb(TIS_REG(locty, TIS_REG_STS), TIS_STS_COMMAND_READY); - rc = tis_wait_sts(locty, timeout_b, - TIS_STS_COMMAND_READY, TIS_STS_COMMAND_READY); - - return rc; -} - -static u32 tis_senddata(const u8 *const data, u32 len) -{ - if (!CONFIG_TCGBIOS) - return 0; - - u32 rc = 0; - u32 offset = 0; - u32 end = 0; - u16 burst = 0; - u32 ctr = 0; - u8 locty = tis_find_active_locality(); - u32 timeout_d = tpm_drivers[TIS_DRIVER_IDX].timeouts[TIS_TIMEOUT_TYPE_D]; - - do { - while (burst == 0 && ctr < timeout_d) { - burst = readl(TIS_REG(locty, TIS_REG_STS)) >> 8; - if (burst == 0) { - msleep(1); - ctr++; - } - } - - if (burst == 0) { - rc = TCG_RESPONSE_TIMEOUT; - break; - } - - while (1) { - writeb(TIS_REG(locty, TIS_REG_DATA_FIFO), data[offset++]); - burst--; - - if (burst == 0 || offset == len) - break; - } - - if (offset == len) - end = 1; - } while (end == 0); - - return rc; -} - -static u32 tis_readresp(u8 *buffer, u32 *len) -{ - if (!CONFIG_TCGBIOS) - return 0; - - u32 rc = 0; - u32 offset = 0; - u32 sts; - u8 locty = tis_find_active_locality(); - - while (offset < *len) { - buffer[offset] = readb(TIS_REG(locty, TIS_REG_DATA_FIFO)); - offset++; - sts = readb(TIS_REG(locty, TIS_REG_STS)); - /* data left ? */ - if ((sts & TIS_STS_DATA_AVAILABLE) == 0) - break; - } - - *len = offset; - - return rc; -} - - -static u32 tis_waitdatavalid(void) -{ - if (!CONFIG_TCGBIOS) - return 0; - - u32 rc = 0; - u8 locty = tis_find_active_locality(); - u32 timeout_c = tpm_drivers[TIS_DRIVER_IDX].timeouts[TIS_TIMEOUT_TYPE_C]; - - if (tis_wait_sts(locty, timeout_c, TIS_STS_VALID, TIS_STS_VALID) != 0) - rc = TCG_NO_RESPONSE; - - return rc; -} - -static u32 tis_waitrespready(enum tpmDurationType to_t) -{ - if (!CONFIG_TCGBIOS) - return 0; - - u32 rc = 0; - u8 locty = tis_find_active_locality(); - u32 timeout = tpm_drivers[TIS_DRIVER_IDX].durations[to_t]; - - writeb(TIS_REG(locty ,TIS_REG_STS), TIS_STS_TPM_GO); - - if (tis_wait_sts(locty, timeout, - TIS_STS_DATA_AVAILABLE, TIS_STS_DATA_AVAILABLE) != 0) - rc = TCG_NO_RESPONSE; - - return rc; -} - - -struct tpm_driver tpm_drivers[TPM_NUM_DRIVERS] = { - [TIS_DRIVER_IDX] = - { - .timeouts = NULL, - .durations = NULL, - .set_timeouts = set_timeouts, - .probe = tis_probe, - .init = tis_init, - .activate = tis_activate, - .ready = tis_ready, - .senddata = tis_senddata, - .readresp = tis_readresp, - .waitdatavalid = tis_waitdatavalid, - .waitrespready = tis_waitrespready, - .sha1threshold = 100 * 1024, - }, -}; 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