--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Linaro Limited
+ */
+#include <common.h>
+#include <dm.h>
+#include <sandboxtee.h>
+#include <tee.h>
+#include <tee/optee_ta_avb.h>
+
+/*
+ * The sandbox tee driver tries to emulate a generic Trusted Exectution
+ * Environment (TEE) with the Trusted Application (TA) OPTEE_TA_AVB
+ * available.
+ */
+
+/**
+ * struct ta_entry - TA entries
+ * @uuid: UUID of an emulated TA
+ * @open_session Called when a session is openened to the TA
+ * @invoke_func Called when a function in the TA is to be invoked
+ *
+ * This struct is used to register TAs in this sandbox emulation of a TEE.
+ */
+struct ta_entry {
+ struct tee_optee_ta_uuid uuid;
+ u32 (*open_session)(uint num_params, struct tee_param *params);
+ u32 (*invoke_func)(u32 func, uint num_params, struct tee_param *params);
+};
+
+#ifdef CONFIG_OPTEE_TA_AVB
+static u32 get_attr(uint n, uint num_params, struct tee_param *params)
+{
+ if (n >= num_params)
+ return TEE_PARAM_ATTR_TYPE_NONE;
+
+ return params[n].attr;
+}
+
+static u32 check_params(u8 p0, u8 p1, u8 p2, u8 p3, uint num_params,
+ struct tee_param *params)
+{
+ u8 p[] = { p0, p1, p2, p3};
+ uint n;
+
+ for (n = 0; n < ARRAY_SIZE(p); n++)
+ if (p[n] != get_attr(n, num_params, params))
+ goto bad_params;
+
+ for (; n < num_params; n++)
+ if (get_attr(n, num_params, params))
+ goto bad_params;
+
+ return TEE_SUCCESS;
+
+bad_params:
+ printf("Bad param attrs\n");
+
+ return TEE_ERROR_BAD_PARAMETERS;
+}
+
+static u64 ta_avb_rollback_indexes[TA_AVB_MAX_ROLLBACK_LOCATIONS];
+static u32 ta_avb_lock_state;
+
+static u32 ta_avb_open_session(uint num_params, struct tee_param *params)
+{
+ /*
+ * We don't expect additional parameters when opening a session to
+ * this TA.
+ */
+ return check_params(TEE_PARAM_ATTR_TYPE_NONE, TEE_PARAM_ATTR_TYPE_NONE,
+ TEE_PARAM_ATTR_TYPE_NONE, TEE_PARAM_ATTR_TYPE_NONE,
+ num_params, params);
+}
+
+static u32 ta_avb_invoke_func(u32 func, uint num_params,
+ struct tee_param *params)
+{
+ u32 res;
+ uint slot;
+ u64 val;
+
+ switch (func) {
+ case TA_AVB_CMD_READ_ROLLBACK_INDEX:
+ res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
+ TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT,
+ TEE_PARAM_ATTR_TYPE_NONE,
+ TEE_PARAM_ATTR_TYPE_NONE,
+ num_params, params);
+ if (res)
+ return res;
+
+ slot = params[0].u.value.a;
+ if (slot >= ARRAY_SIZE(ta_avb_rollback_indexes)) {
+ printf("Rollback index slot out of bounds %u\n", slot);
+ return TEE_ERROR_BAD_PARAMETERS;
+ }
+
+ val = ta_avb_rollback_indexes[slot];
+ params[1].u.value.a = val >> 32;
+ params[1].u.value.b = val;
+ return TEE_SUCCESS;
+
+ case TA_AVB_CMD_WRITE_ROLLBACK_INDEX:
+ res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
+ TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
+ TEE_PARAM_ATTR_TYPE_NONE,
+ TEE_PARAM_ATTR_TYPE_NONE,
+ num_params, params);
+ if (res)
+ return res;
+
+ slot = params[0].u.value.a;
+ if (slot >= ARRAY_SIZE(ta_avb_rollback_indexes)) {
+ printf("Rollback index slot out of bounds %u\n", slot);
+ return TEE_ERROR_BAD_PARAMETERS;
+ }
+
+ val = (u64)params[1].u.value.a << 32 | params[1].u.value.b;
+ if (val < ta_avb_rollback_indexes[slot])
+ return TEE_ERROR_SECURITY;
+
+ ta_avb_rollback_indexes[slot] = val;
+ return TEE_SUCCESS;
+
+ case TA_AVB_CMD_READ_LOCK_STATE:
+ res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT,
+ TEE_PARAM_ATTR_TYPE_NONE,
+ TEE_PARAM_ATTR_TYPE_NONE,
+ TEE_PARAM_ATTR_TYPE_NONE,
+ num_params, params);
+ if (res)
+ return res;
+
+ params[0].u.value.a = ta_avb_lock_state;
+ return TEE_SUCCESS;
+
+ case TA_AVB_CMD_WRITE_LOCK_STATE:
+ res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
+ TEE_PARAM_ATTR_TYPE_NONE,
+ TEE_PARAM_ATTR_TYPE_NONE,
+ TEE_PARAM_ATTR_TYPE_NONE,
+ num_params, params);
+ if (res)
+ return res;
+
+ if (ta_avb_lock_state != params[0].u.value.a) {
+ ta_avb_lock_state = params[0].u.value.a;
+ memset(ta_avb_rollback_indexes, 0,
+ sizeof(ta_avb_rollback_indexes));
+ }
+
+ return TEE_SUCCESS;
+
+ default:
+ return TEE_ERROR_NOT_SUPPORTED;
+ }
+}
+#endif /*OPTEE_TA_AVB*/
+
+static const struct ta_entry ta_entries[] = {
+#ifdef CONFIG_OPTEE_TA_AVB
+ { .uuid = TA_AVB_UUID,
+ .open_session = ta_avb_open_session,
+ .invoke_func = ta_avb_invoke_func,
+ },
+#endif
+};
+
+static void sandbox_tee_get_version(struct udevice *dev,
+ struct tee_version_data *vers)
+{
+ struct tee_version_data v = {
+ .gen_caps = TEE_GEN_CAP_GP | TEE_GEN_CAP_REG_MEM,
+ };
+
+ *vers = v;
+}
+
+static int sandbox_tee_close_session(struct udevice *dev, u32 session)
+{
+ struct sandbox_tee_state *state = dev_get_priv(dev);
+
+ if (!state->ta || state->session != session)
+ return -EINVAL;
+
+ state->session = 0;
+ state->ta = NULL;
+
+ return 0;
+}
+
+static const struct ta_entry *find_ta_entry(u8 uuid[TEE_UUID_LEN])
+{
+ struct tee_optee_ta_uuid u;
+ uint n;
+
+ tee_optee_ta_uuid_from_octets(&u, uuid);
+
+ for (n = 0; n < ARRAY_SIZE(ta_entries); n++)
+ if (!memcmp(&u, &ta_entries[n].uuid, sizeof(u)))
+ return ta_entries + n;
+
+ return NULL;
+}
+
+static int sandbox_tee_open_session(struct udevice *dev,
+ struct tee_open_session_arg *arg,
+ uint num_params, struct tee_param *params)
+{
+ struct sandbox_tee_state *state = dev_get_priv(dev);
+ const struct ta_entry *ta;
+
+ if (state->ta) {
+ printf("A session is already open\n");
+ return -EBUSY;
+ }
+
+ ta = find_ta_entry(arg->uuid);
+ if (!ta) {
+ printf("Cannot find TA\n");
+ arg->ret = TEE_ERROR_ITEM_NOT_FOUND;
+ arg->ret_origin = TEE_ORIGIN_TEE;
+
+ return 0;
+ }
+
+ arg->ret = ta->open_session(num_params, params);
+ arg->ret_origin = TEE_ORIGIN_TRUSTED_APP;
+
+ if (!arg->ret) {
+ state->ta = (void *)ta;
+ state->session = 1;
+ arg->session = state->session;
+ } else {
+ printf("Cannot open session, TA returns error\n");
+ }
+
+ return 0;
+}
+
+static int sandbox_tee_invoke_func(struct udevice *dev,
+ struct tee_invoke_arg *arg,
+ uint num_params, struct tee_param *params)
+{
+ struct sandbox_tee_state *state = dev_get_priv(dev);
+ struct ta_entry *ta = state->ta;
+
+ if (!arg->session) {
+ printf("Missing session\n");
+ return -EINVAL;
+ }
+
+ if (!ta) {
+ printf("TA session not available\n");
+ return -EINVAL;
+ }
+
+ if (arg->session != state->session) {
+ printf("Session mismatch\n");
+ return -EINVAL;
+ }
+
+ arg->ret = ta->invoke_func(arg->func, num_params, params);
+ arg->ret_origin = TEE_ORIGIN_TRUSTED_APP;
+
+ return 0;
+}
+
+static int sandbox_tee_shm_register(struct udevice *dev, struct tee_shm *shm)
+{
+ struct sandbox_tee_state *state = dev_get_priv(dev);
+
+ state->num_shms++;
+
+ return 0;
+}
+
+static int sandbox_tee_shm_unregister(struct udevice *dev, struct tee_shm *shm)
+{
+ struct sandbox_tee_state *state = dev_get_priv(dev);
+
+ state->num_shms--;
+
+ return 0;
+}
+
+static const struct tee_driver_ops sandbox_tee_ops = {
+ .get_version = sandbox_tee_get_version,
+ .open_session = sandbox_tee_open_session,
+ .close_session = sandbox_tee_close_session,
+ .invoke_func = sandbox_tee_invoke_func,
+ .shm_register = sandbox_tee_shm_register,
+ .shm_unregister = sandbox_tee_shm_unregister,
+};
+
+static const struct udevice_id sandbox_tee_match[] = {
+ { .compatible = "sandbox,tee" },
+ {},
+};
+
+U_BOOT_DRIVER(sandbox_tee) = {
+ .name = "sandbox_tee",
+ .id = UCLASS_TEE,
+ .of_match = sandbox_tee_match,
+ .ops = &sandbox_tee_ops,
+ .priv_auto_alloc_size = sizeof(struct sandbox_tee_state),
+};
projects / oweals / u-boot.git / commitdiff