cddd6008f9
As discussed on the mailing list and voted upon, the coreboot project is going to move the majority of copyrights out of the headers and into an AUTHORS file. This will happen a bit at a time, as we'll be unifying license headers at the same time. Updated Authors file is in a separate commit. Signed-off-by: Martin Roth <martin@coreboot.org> Change-Id: I1acea8c975d14904b7e486dc57a1a67480a6ee6e Reviewed-on: https://review.coreboot.org/c/coreboot/+/36178 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but without any warranty; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <arch/early_variables.h>
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#include <stdint.h>
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#include <assert.h>
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#include <commonlib/endian.h>
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#include <console/console.h>
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#include <delay.h>
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#include <device/i2c_simple.h>
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#include <endian.h>
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#include <lib.h>
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#include <security/tpm/tis.h>
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#include <timer.h>
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#define RECV_TIMEOUT (1 * 1000) /* 1 second */
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#define XMIT_TIMEOUT (1 * 1000) /* 1 second */
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#define SLEEP_DURATION 1000 /* microseconds */
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struct tpm_output_header {
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uint16_t tag;
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uint32_t length;
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uint32_t return_code;
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} __packed;
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int tis_open(void)
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{
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return 0;
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}
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int tis_close(void)
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{
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return 0;
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}
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int tis_init(void)
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{
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return 0;
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}
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int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
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uint8_t *recvbuf, size_t *rbuf_len)
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{
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size_t hdr_bytes;
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struct tpm_output_header *header;
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size_t max_recv_bytes;
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size_t recv_bytes;
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int status;
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struct stopwatch sw;
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ASSERT(sbuf_size >= 10);
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if (CONFIG(DRIVER_TPM_DISPLAY_TIS_BYTES)) {
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/* Display the TPM command */
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if (sbuf_size >= 10)
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printk(BIOS_DEBUG, "TPM Command: 0x%08x\n",
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read_at_be32(sendbuf, sizeof(uint16_t)
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+ sizeof(uint32_t)));
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hexdump(sendbuf, sbuf_size);
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}
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/* Send the command to the TPM */
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stopwatch_init_msecs_expire(&sw, XMIT_TIMEOUT);
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while (1) {
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status = i2c_write_raw(CONFIG_DRIVER_TPM_I2C_BUS,
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CONFIG_DRIVER_TPM_I2C_ADDR, (uint8_t *)sendbuf,
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sbuf_size);
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if ((status < 0) && (!stopwatch_expired(&sw)))
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continue;
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if (status < 0)
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return status;
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break;
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}
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/* Read the TPM response header */
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max_recv_bytes = *rbuf_len;
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ASSERT(max_recv_bytes >= sizeof(*header));
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hdr_bytes = sizeof(*header);
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header = (struct tpm_output_header *)recvbuf;
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stopwatch_init_msecs_expire(&sw, RECV_TIMEOUT);
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do {
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status = i2c_read_raw(CONFIG_DRIVER_TPM_I2C_BUS,
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CONFIG_DRIVER_TPM_I2C_ADDR, recvbuf, hdr_bytes);
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if (status > 0)
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break;
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udelay(SLEEP_DURATION);
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} while (!stopwatch_expired(&sw));
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if (status != sizeof(*header))
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return -1;
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/* Determine the number of bytes remaining */
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recv_bytes = min(be32_to_cpu(*(uint32_t *)&header->length),
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max_recv_bytes);
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/* Determine if there is additional response data */
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if (recv_bytes > hdr_bytes) {
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/* Display the TPM response */
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if (CONFIG(DRIVER_TPM_DISPLAY_TIS_BYTES))
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hexdump(recvbuf, hdr_bytes);
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/* Read the full TPM response */
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status = i2c_read_raw(CONFIG_DRIVER_TPM_I2C_BUS,
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CONFIG_DRIVER_TPM_I2C_ADDR, recvbuf, recv_bytes);
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if (status < 0)
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return status;
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}
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/* Return the number of bytes received */
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*rbuf_len = status;
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/* Display the TPM response */
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if (CONFIG(DRIVER_TPM_DISPLAY_TIS_BYTES)) {
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printk(BIOS_DEBUG, "TPM Response: 0x%08x\n",
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read_at_be32(recvbuf, sizeof(uint16_t)
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+ sizeof(uint32_t)));
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hexdump(recvbuf, *rbuf_len);
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}
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/* Successful transfer */
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return 0;
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}
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