mirror of
https://github.com/AsahiLinux/u-boot
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4e4bf9449b
Move this out of the common header and include it only where needed. Signed-off-by: Simon Glass <sjg@chromium.org>
289 lines
7.3 KiB
C
289 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2013 Google, Inc
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*/
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#include <common.h>
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#include <display_options.h>
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#include <dm.h>
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#include <tpm-v1.h>
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#include <asm/state.h>
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#include <asm/unaligned.h>
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#include <u-boot/crc.h>
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#include "sandbox_common.h"
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#define NV_DATA_PUBLIC_PERMISSIONS_OFFSET 60
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/*
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* Information about our TPM emulation. This is preserved in the sandbox
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* state file if enabled.
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*/
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static struct tpm_state {
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bool valid;
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struct nvdata_state nvdata[NV_SEQ_COUNT];
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} s_state, *g_state;
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/**
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* sandbox_tpm_read_state() - read the sandbox EC state from the state file
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*
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* If data is available, then blob and node will provide access to it. If
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* not this function sets up an empty TPM.
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*
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* @blob: Pointer to device tree blob, or NULL if no data to read
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* @node: Node offset to read from
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*/
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static int sandbox_tpm_read_state(const void *blob, int node)
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{
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struct tpm_state *state = &s_state;
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const char *prop;
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int len;
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int i;
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if (!blob)
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return 0;
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for (i = 0; i < NV_SEQ_COUNT; i++) {
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struct nvdata_state *nvd = &state->nvdata[i];
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char prop_name[20];
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sprintf(prop_name, "nvdata%d", i);
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prop = fdt_getprop(blob, node, prop_name, &len);
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if (len >= NV_DATA_SIZE)
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return log_msg_ret("nvd", -E2BIG);
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if (prop) {
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memcpy(nvd->data, prop, len);
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nvd->length = len;
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nvd->present = true;
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}
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}
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s_state.valid = true;
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return 0;
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}
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/**
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* sandbox_tpm_write_state() - Write out our state to the state file
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*
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* The caller will ensure that there is a node ready for the state. The node
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* may already contain the old state, in which case it is overridden.
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*
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* @blob: Device tree blob holding state
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* @node: Node to write our state into
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*/
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static int sandbox_tpm_write_state(void *blob, int node)
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{
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const struct tpm_state *state = g_state;
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int i;
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if (!state)
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return 0;
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/*
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* We are guaranteed enough space to write basic properties.
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* We could use fdt_add_subnode() to put each set of data in its
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* own node - perhaps useful if we add access informaiton to each.
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*/
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for (i = 0; i < NV_SEQ_COUNT; i++) {
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const struct nvdata_state *nvd = &state->nvdata[i];
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char prop_name[20];
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if (nvd->present) {
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snprintf(prop_name, sizeof(prop_name), "nvdata%d", i);
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fdt_setprop(blob, node, prop_name, nvd->data,
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nvd->length);
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}
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}
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return 0;
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}
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SANDBOX_STATE_IO(sandbox_tpm, "google,sandbox-tpm", sandbox_tpm_read_state,
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sandbox_tpm_write_state);
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static void handle_cap_flag_space(u8 **datap, uint index)
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{
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struct tpm_nv_data_public pub;
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/* TPM_NV_PER_PPWRITE */
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memset(&pub, '\0', sizeof(pub));
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pub.nv_index = __cpu_to_be32(index);
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pub.pcr_info_read.pcr_selection.size_of_select = __cpu_to_be16(
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sizeof(pub.pcr_info_read.pcr_selection.pcr_select));
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pub.permission.attributes = __cpu_to_be32(1);
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pub.pcr_info_write = pub.pcr_info_read;
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memcpy(*datap, &pub, sizeof(pub));
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*datap += sizeof(pub);
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}
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static int sandbox_tpm_xfer(struct udevice *dev, const uint8_t *sendbuf,
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size_t send_size, uint8_t *recvbuf,
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size_t *recv_len)
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{
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struct tpm_state *tpm = dev_get_priv(dev);
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uint32_t code, index, length, type;
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uint8_t *data;
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int seq;
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code = get_unaligned_be32(sendbuf + sizeof(uint16_t) +
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sizeof(uint32_t));
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#ifdef DEBUG
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printf("tpm: %zd bytes, recv_len %zd, cmd = %x\n", send_size,
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*recv_len, code);
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print_buffer(0, sendbuf, 1, send_size, 0);
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#endif
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switch (code) {
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case TPM_CMD_GET_CAPABILITY:
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type = get_unaligned_be32(sendbuf + 14);
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switch (type) {
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case TPM_CAP_FLAG:
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index = get_unaligned_be32(sendbuf + 18);
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printf("Get flags index %#02x\n", index);
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*recv_len = 22;
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memset(recvbuf, '\0', *recv_len);
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data = recvbuf + TPM_HDR_LEN + sizeof(uint32_t);
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switch (index) {
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case FIRMWARE_NV_INDEX:
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break;
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case KERNEL_NV_INDEX:
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handle_cap_flag_space(&data, index);
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*recv_len = data - recvbuf;
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break;
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case TPM_CAP_FLAG_PERMANENT: {
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struct tpm_permanent_flags *pflags;
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pflags = (struct tpm_permanent_flags *)data;
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memset(pflags, '\0', sizeof(*pflags));
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put_unaligned_be32(TPM_TAG_PERMANENT_FLAGS,
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&pflags->tag);
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*recv_len = TPM_HEADER_SIZE + 4 +
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sizeof(*pflags);
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break;
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}
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default:
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printf(" ** Unknown flags index %x\n", index);
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return -ENOSYS;
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}
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put_unaligned_be32(*recv_len, recvbuf + TPM_HDR_LEN);
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break;
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case TPM_CAP_NV_INDEX:
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index = get_unaligned_be32(sendbuf + 18);
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printf("Get cap nv index %#02x\n", index);
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put_unaligned_be32(22, recvbuf + TPM_HDR_LEN);
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break;
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default:
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printf(" ** Unknown 0x65 command type %#02x\n",
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type);
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return -ENOSYS;
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}
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break;
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case TPM_CMD_NV_WRITE_VALUE:
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index = get_unaligned_be32(sendbuf + 10);
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length = get_unaligned_be32(sendbuf + 18);
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seq = sb_tpm_index_to_seq(index);
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if (seq < 0)
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return -EINVAL;
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printf("tpm: nvwrite index=%#02x, len=%#02x\n", index, length);
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sb_tpm_write_data(tpm->nvdata, seq, sendbuf, 22, length);
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break;
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case TPM_CMD_NV_READ_VALUE: /* nvread */
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index = get_unaligned_be32(sendbuf + 10);
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length = get_unaligned_be32(sendbuf + 18);
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seq = sb_tpm_index_to_seq(index);
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if (seq < 0)
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return -EINVAL;
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printf("tpm: nvread index=%#02x, len=%#02x, seq=%#02x\n", index,
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length, seq);
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*recv_len = TPM_HDR_LEN + sizeof(uint32_t) + length;
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memset(recvbuf, '\0', *recv_len);
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put_unaligned_be32(length, recvbuf + TPM_HDR_LEN);
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sb_tpm_read_data(tpm->nvdata, seq, recvbuf, TPM_HDR_LEN + 4,
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length);
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break;
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case TPM_CMD_EXTEND:
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*recv_len = 30;
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memset(recvbuf, '\0', *recv_len);
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break;
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case TPM_CMD_NV_DEFINE_SPACE:
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index = get_unaligned_be32(sendbuf + 12);
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length = get_unaligned_be32(sendbuf + 77);
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seq = sb_tpm_index_to_seq(index);
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if (seq < 0)
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return -EINVAL;
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printf("tpm: define_space index=%#02x, len=%#02x, seq=%#02x\n",
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index, length, seq);
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sb_tpm_define_data(tpm->nvdata, seq, length);
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*recv_len = 12;
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memset(recvbuf, '\0', *recv_len);
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break;
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case 0x15: /* pcr read */
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case 0x5d: /* force clear */
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case 0x6f: /* physical enable */
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case 0x72: /* physical set deactivated */
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case 0x99: /* startup */
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case 0x50: /* self test full */
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case 0x4000000a: /* assert physical presence */
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*recv_len = 12;
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memset(recvbuf, '\0', *recv_len);
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break;
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default:
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printf("Unknown tpm command %02x\n", code);
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return -ENOSYS;
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}
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#ifdef DEBUG
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printf("tpm: rx recv_len %zd\n", *recv_len);
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print_buffer(0, recvbuf, 1, *recv_len, 0);
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#endif
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return 0;
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}
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static int sandbox_tpm_get_desc(struct udevice *dev, char *buf, int size)
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{
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if (size < 15)
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return -ENOSPC;
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return snprintf(buf, size, "sandbox TPM");
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}
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static int sandbox_tpm_probe(struct udevice *dev)
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{
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struct tpm_state *tpm = dev_get_priv(dev);
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if (s_state.valid)
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memcpy(tpm, &s_state, sizeof(*tpm));
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g_state = tpm;
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return 0;
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}
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static int sandbox_tpm_open(struct udevice *dev)
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{
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return 0;
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}
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static int sandbox_tpm_close(struct udevice *dev)
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{
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return 0;
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}
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static const struct tpm_ops sandbox_tpm_ops = {
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.open = sandbox_tpm_open,
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.close = sandbox_tpm_close,
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.get_desc = sandbox_tpm_get_desc,
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.xfer = sandbox_tpm_xfer,
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};
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static const struct udevice_id sandbox_tpm_ids[] = {
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{ .compatible = "google,sandbox-tpm" },
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{ }
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};
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U_BOOT_DRIVER(google_sandbox_tpm) = {
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.name = "google_sandbox_tpm",
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.id = UCLASS_TPM,
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.of_match = sandbox_tpm_ids,
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.ops = &sandbox_tpm_ops,
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.probe = sandbox_tpm_probe,
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.priv_auto = sizeof(struct tpm_state),
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};
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