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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
366 lines
9.1 KiB
C
366 lines
9.1 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 <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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/* TPM NVRAM location indices. */
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#define FIRMWARE_NV_INDEX 0x1007
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#define KERNEL_NV_INDEX 0x1008
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#define BACKUP_NV_INDEX 0x1009
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#define FWMP_NV_INDEX 0x100a
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#define REC_HASH_NV_INDEX 0x100b
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#define REC_HASH_NV_SIZE VB2_SHA256_DIGEST_SIZE
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#define NV_DATA_PUBLIC_PERMISSIONS_OFFSET 60
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/* Kernel TPM space - KERNEL_NV_INDEX, locked with physical presence */
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#define ROLLBACK_SPACE_KERNEL_VERSION 2
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#define ROLLBACK_SPACE_KERNEL_UID 0x4752574C /* 'GRWL' */
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struct rollback_space_kernel {
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/* Struct version, for backwards compatibility */
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uint8_t struct_version;
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/* Unique ID to detect space redefinition */
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uint32_t uid;
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/* Kernel versions */
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uint32_t kernel_versions;
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/* Reserved for future expansion */
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uint8_t reserved[3];
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/* Checksum (v2 and later only) */
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uint8_t crc8;
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} __packed rollback_space_kernel;
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/*
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* These numbers derive from adding the sizes of command fields as shown in
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* the TPM commands manual.
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*/
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#define TPM_REQUEST_HEADER_LENGTH 10
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#define TPM_RESPONSE_HEADER_LENGTH 10
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/* These are the different non-volatile spaces that we emulate */
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enum {
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NV_GLOBAL_LOCK,
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NV_SEQ_FIRMWARE,
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NV_SEQ_KERNEL,
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NV_SEQ_BACKUP,
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NV_SEQ_FWMP,
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NV_SEQ_REC_HASH,
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NV_SEQ_COUNT,
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};
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/* Size of each non-volatile space */
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#define NV_DATA_SIZE 0x20
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struct nvdata_state {
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bool present;
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u8 data[NV_DATA_SIZE];
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};
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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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} 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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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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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 (prop && len == NV_DATA_SIZE) {
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memcpy(g_state.nvdata[i].data, prop, NV_DATA_SIZE);
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g_state.nvdata[i].present = true;
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}
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}
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g_state.valid = true;
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return 0;
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}
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/**
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* cros_ec_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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int i;
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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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char prop_name[20];
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if (g_state.nvdata[i].present) {
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sprintf(prop_name, "nvdata%d", i);
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fdt_setprop(blob, node, prop_name,
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g_state.nvdata[i].data, NV_DATA_SIZE);
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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 int index_to_seq(uint32_t index)
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{
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switch (index) {
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case FIRMWARE_NV_INDEX:
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return NV_SEQ_FIRMWARE;
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case KERNEL_NV_INDEX:
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return NV_SEQ_KERNEL;
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case BACKUP_NV_INDEX:
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return NV_SEQ_BACKUP;
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case FWMP_NV_INDEX:
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return NV_SEQ_FWMP;
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case REC_HASH_NV_INDEX:
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return NV_SEQ_REC_HASH;
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case 0:
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return NV_GLOBAL_LOCK;
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}
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printf("Invalid nv index %#x\n", index);
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return -1;
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}
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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_RESPONSE_HEADER_LENGTH +
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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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TPM_RESPONSE_HEADER_LENGTH -
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sizeof(uint32_t);
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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,
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recvbuf +
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TPM_RESPONSE_HEADER_LENGTH);
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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 +
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TPM_RESPONSE_HEADER_LENGTH);
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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 = 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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memcpy(&tpm->nvdata[seq].data, sendbuf + 22, length);
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tpm->nvdata[seq].present = true;
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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 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 = 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_RESPONSE_HEADER_LENGTH + sizeof(uint32_t) +
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length;
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memset(recvbuf, '\0', *recv_len);
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put_unaligned_be32(length, recvbuf +
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TPM_RESPONSE_HEADER_LENGTH);
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if (seq == NV_SEQ_KERNEL) {
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struct rollback_space_kernel rsk;
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data = recvbuf + TPM_RESPONSE_HEADER_LENGTH +
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sizeof(uint32_t);
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memset(&rsk, 0, sizeof(struct rollback_space_kernel));
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rsk.struct_version = 2;
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rsk.uid = ROLLBACK_SPACE_KERNEL_UID;
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rsk.crc8 = crc8(0, (unsigned char *)&rsk,
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offsetof(struct rollback_space_kernel,
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crc8));
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memcpy(data, &rsk, sizeof(rsk));
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} else if (!tpm->nvdata[seq].present) {
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put_unaligned_be32(TPM_BADINDEX, recvbuf +
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sizeof(uint16_t) + sizeof(uint32_t));
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} else {
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memcpy(recvbuf + TPM_RESPONSE_HEADER_LENGTH +
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sizeof(uint32_t), &tpm->nvdata[seq].data,
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length);
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}
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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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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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memcpy(tpm, &g_state, sizeof(*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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