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-rw-r--r--services/std_svc/drtm/drtm_main.c839
1 files changed, 839 insertions, 0 deletions
diff --git a/services/std_svc/drtm/drtm_main.c b/services/std_svc/drtm/drtm_main.c
new file mode 100644
index 0000000..3acf683
--- /dev/null
+++ b/services/std_svc/drtm/drtm_main.c
@@ -0,0 +1,839 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * DRTM service
+ *
+ * Authors:
+ * Lucian Paul-Trifu <lucian.paultrifu@gmail.com>
+ * Brian Nezvadovitz <brinez@microsoft.com> 2021-02-01
+ */
+
+#include <stdint.h>
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <drivers/auth/crypto_mod.h>
+#include "drtm_main.h"
+#include "drtm_measurements.h"
+#include "drtm_remediation.h"
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/psci/psci_lib.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <plat/common/platform.h>
+#include <services/drtm_svc.h>
+#include <services/sdei.h>
+#include <platform_def.h>
+
+/* Structure to store DRTM features specific to the platform. */
+static drtm_features_t plat_drtm_features;
+
+/* DRTM-formatted memory map. */
+static drtm_memory_region_descriptor_table_t *plat_drtm_mem_map;
+
+/* DLME header */
+struct_dlme_data_header dlme_data_hdr_init;
+
+/* Minimum data memory requirement */
+uint64_t dlme_data_min_size;
+
+int drtm_setup(void)
+{
+ bool rc;
+ const plat_drtm_tpm_features_t *plat_tpm_feat;
+ const plat_drtm_dma_prot_features_t *plat_dma_prot_feat;
+
+ INFO("DRTM service setup\n");
+
+ /* Read boot PE ID from MPIDR */
+ plat_drtm_features.boot_pe_id = read_mpidr_el1() & MPIDR_AFFINITY_MASK;
+
+ rc = drtm_dma_prot_init();
+ if (rc) {
+ return INTERNAL_ERROR;
+ }
+
+ /*
+ * initialise the platform supported crypto module that will
+ * be used by the DRTM-service to calculate hash of DRTM-
+ * implementation specific components
+ */
+ crypto_mod_init();
+
+ /* Build DRTM-compatible address map. */
+ plat_drtm_mem_map = drtm_build_address_map();
+ if (plat_drtm_mem_map == NULL) {
+ return INTERNAL_ERROR;
+ }
+
+ /* Get DRTM features from platform hooks. */
+ plat_tpm_feat = plat_drtm_get_tpm_features();
+ if (plat_tpm_feat == NULL) {
+ return INTERNAL_ERROR;
+ }
+
+ plat_dma_prot_feat = plat_drtm_get_dma_prot_features();
+ if (plat_dma_prot_feat == NULL) {
+ return INTERNAL_ERROR;
+ }
+
+ /*
+ * Add up minimum DLME data memory.
+ *
+ * For systems with complete DMA protection there is only one entry in
+ * the protected regions table.
+ */
+ if (plat_dma_prot_feat->dma_protection_support ==
+ ARM_DRTM_DMA_PROT_FEATURES_DMA_SUPPORT_COMPLETE) {
+ dlme_data_min_size =
+ sizeof(drtm_memory_region_descriptor_table_t) +
+ sizeof(drtm_mem_region_t);
+ dlme_data_hdr_init.dlme_prot_regions_size = dlme_data_min_size;
+ } else {
+ /*
+ * TODO set protected regions table size based on platform DMA
+ * protection configuration
+ */
+ panic();
+ }
+
+ dlme_data_hdr_init.dlme_addr_map_size = drtm_get_address_map_size();
+ dlme_data_hdr_init.dlme_tcb_hashes_table_size =
+ plat_drtm_get_tcb_hash_table_size();
+ dlme_data_hdr_init.dlme_impdef_region_size =
+ plat_drtm_get_imp_def_dlme_region_size();
+
+ dlme_data_min_size += dlme_data_hdr_init.dlme_addr_map_size +
+ PLAT_DRTM_EVENT_LOG_MAX_SIZE +
+ dlme_data_hdr_init.dlme_tcb_hashes_table_size +
+ dlme_data_hdr_init.dlme_impdef_region_size;
+
+ dlme_data_min_size = page_align(dlme_data_min_size, UP)/PAGE_SIZE;
+
+ /* Fill out platform DRTM features structure */
+ /* Only support default PCR schema (0x1) in this implementation. */
+ ARM_DRTM_TPM_FEATURES_SET_PCR_SCHEMA(plat_drtm_features.tpm_features,
+ ARM_DRTM_TPM_FEATURES_PCR_SCHEMA_DEFAULT);
+ ARM_DRTM_TPM_FEATURES_SET_TPM_HASH(plat_drtm_features.tpm_features,
+ plat_tpm_feat->tpm_based_hash_support);
+ ARM_DRTM_TPM_FEATURES_SET_FW_HASH(plat_drtm_features.tpm_features,
+ plat_tpm_feat->firmware_hash_algorithm);
+ ARM_DRTM_MIN_MEM_REQ_SET_MIN_DLME_DATA_SIZE(plat_drtm_features.minimum_memory_requirement,
+ dlme_data_min_size);
+ ARM_DRTM_MIN_MEM_REQ_SET_DCE_SIZE(plat_drtm_features.minimum_memory_requirement,
+ plat_drtm_get_min_size_normal_world_dce());
+ ARM_DRTM_DMA_PROT_FEATURES_SET_MAX_REGIONS(plat_drtm_features.dma_prot_features,
+ plat_dma_prot_feat->max_num_mem_prot_regions);
+ ARM_DRTM_DMA_PROT_FEATURES_SET_DMA_SUPPORT(plat_drtm_features.dma_prot_features,
+ plat_dma_prot_feat->dma_protection_support);
+ ARM_DRTM_TCB_HASH_FEATURES_SET_MAX_NUM_HASHES(plat_drtm_features.tcb_hash_features,
+ plat_drtm_get_tcb_hash_features());
+
+ return 0;
+}
+
+static inline void invalidate_icache_all(void)
+{
+ __asm__ volatile("ic ialluis");
+ dsb();
+ isb();
+}
+
+static inline uint64_t drtm_features_tpm(void *ctx)
+{
+ SMC_RET2(ctx, 1ULL, /* TPM feature is supported */
+ plat_drtm_features.tpm_features);
+}
+
+static inline uint64_t drtm_features_mem_req(void *ctx)
+{
+ SMC_RET2(ctx, 1ULL, /* memory req Feature is supported */
+ plat_drtm_features.minimum_memory_requirement);
+}
+
+static inline uint64_t drtm_features_boot_pe_id(void *ctx)
+{
+ SMC_RET2(ctx, 1ULL, /* Boot PE feature is supported */
+ plat_drtm_features.boot_pe_id);
+}
+
+static inline uint64_t drtm_features_dma_prot(void *ctx)
+{
+ SMC_RET2(ctx, 1ULL, /* DMA protection feature is supported */
+ plat_drtm_features.dma_prot_features);
+}
+
+static inline uint64_t drtm_features_tcb_hashes(void *ctx)
+{
+ SMC_RET2(ctx, 1ULL, /* TCB hash feature is supported */
+ plat_drtm_features.tcb_hash_features);
+}
+
+static enum drtm_retc drtm_dl_check_caller_el(void *ctx)
+{
+ uint64_t spsr_el3 = read_ctx_reg(get_el3state_ctx(ctx), CTX_SPSR_EL3);
+ uint64_t dl_caller_el;
+ uint64_t dl_caller_aarch;
+
+ dl_caller_el = spsr_el3 >> MODE_EL_SHIFT & MODE_EL_MASK;
+ dl_caller_aarch = spsr_el3 >> MODE_RW_SHIFT & MODE_RW_MASK;
+
+ /* Caller's security state is checked from drtm_smc_handle function */
+
+ /* Caller can be NS-EL2/EL1 */
+ if (dl_caller_el == MODE_EL3) {
+ ERROR("DRTM: invalid launch from EL3\n");
+ return DENIED;
+ }
+
+ if (dl_caller_aarch != MODE_RW_64) {
+ ERROR("DRTM: invalid launch from non-AArch64 execution state\n");
+ return DENIED;
+ }
+
+ return SUCCESS;
+}
+
+static enum drtm_retc drtm_dl_check_cores(void)
+{
+ bool running_on_single_core;
+ uint64_t this_pe_aff_value = read_mpidr_el1() & MPIDR_AFFINITY_MASK;
+
+ if (this_pe_aff_value != plat_drtm_features.boot_pe_id) {
+ ERROR("DRTM: invalid launch on a non-boot PE\n");
+ return DENIED;
+ }
+
+ running_on_single_core = psci_is_last_on_cpu_safe();
+ if (!running_on_single_core) {
+ ERROR("DRTM: invalid launch due to non-boot PE not being turned off\n");
+ return DENIED;
+ }
+
+ return SUCCESS;
+}
+
+static enum drtm_retc drtm_dl_prepare_dlme_data(const struct_drtm_dl_args *args)
+{
+ int rc;
+ uint64_t dlme_data_paddr;
+ size_t dlme_data_max_size;
+ uintptr_t dlme_data_mapping;
+ struct_dlme_data_header *dlme_data_hdr;
+ uint8_t *dlme_data_cursor;
+ size_t dlme_data_mapping_bytes;
+ size_t serialised_bytes_actual;
+
+ dlme_data_paddr = args->dlme_paddr + args->dlme_data_off;
+ dlme_data_max_size = args->dlme_size - args->dlme_data_off;
+
+ /*
+ * The capacity of the given DLME data region is checked when
+ * the other dynamic launch arguments are.
+ */
+ if (dlme_data_max_size < dlme_data_min_size) {
+ ERROR("%s: assertion failed:"
+ " dlme_data_max_size (%ld) < dlme_data_total_bytes_req (%ld)\n",
+ __func__, dlme_data_max_size, dlme_data_min_size);
+ panic();
+ }
+
+ /* Map the DLME data region as NS memory. */
+ dlme_data_mapping_bytes = ALIGNED_UP(dlme_data_max_size, DRTM_PAGE_SIZE);
+ rc = mmap_add_dynamic_region_alloc_va(dlme_data_paddr,
+ &dlme_data_mapping,
+ dlme_data_mapping_bytes,
+ MT_RW_DATA | MT_NS |
+ MT_SHAREABILITY_ISH);
+ if (rc != 0) {
+ WARN("DRTM: %s: mmap_add_dynamic_region() failed rc=%d\n",
+ __func__, rc);
+ return INTERNAL_ERROR;
+ }
+ dlme_data_hdr = (struct_dlme_data_header *)dlme_data_mapping;
+ dlme_data_cursor = (uint8_t *)dlme_data_hdr + sizeof(*dlme_data_hdr);
+
+ memcpy(dlme_data_hdr, (const void *)&dlme_data_hdr_init,
+ sizeof(*dlme_data_hdr));
+
+ /* Set the header version and size. */
+ dlme_data_hdr->version = 1;
+ dlme_data_hdr->this_hdr_size = sizeof(*dlme_data_hdr);
+
+ /* Prepare DLME protected regions. */
+ drtm_dma_prot_serialise_table(dlme_data_cursor,
+ &serialised_bytes_actual);
+ assert(serialised_bytes_actual ==
+ dlme_data_hdr->dlme_prot_regions_size);
+ dlme_data_cursor += serialised_bytes_actual;
+
+ /* Prepare DLME address map. */
+ if (plat_drtm_mem_map != NULL) {
+ memcpy(dlme_data_cursor, plat_drtm_mem_map,
+ dlme_data_hdr->dlme_addr_map_size);
+ } else {
+ WARN("DRTM: DLME address map is not in the cache\n");
+ }
+ dlme_data_cursor += dlme_data_hdr->dlme_addr_map_size;
+
+ /* Prepare DRTM event log for DLME. */
+ drtm_serialise_event_log(dlme_data_cursor, &serialised_bytes_actual);
+ assert(serialised_bytes_actual <= PLAT_DRTM_EVENT_LOG_MAX_SIZE);
+ dlme_data_hdr->dlme_tpm_log_size = serialised_bytes_actual;
+ dlme_data_cursor += serialised_bytes_actual;
+
+ /*
+ * TODO: Prepare the TCB hashes for DLME, currently its size
+ * 0
+ */
+ dlme_data_cursor += dlme_data_hdr->dlme_tcb_hashes_table_size;
+
+ /* Implementation-specific region size is unused. */
+ dlme_data_cursor += dlme_data_hdr->dlme_impdef_region_size;
+
+ /*
+ * Prepare DLME data size, includes all data region referenced above
+ * alongwith the DLME data header
+ */
+ dlme_data_hdr->dlme_data_size = dlme_data_cursor - (uint8_t *)dlme_data_hdr;
+
+ /* Unmap the DLME data region. */
+ rc = mmap_remove_dynamic_region(dlme_data_mapping, dlme_data_mapping_bytes);
+ if (rc != 0) {
+ ERROR("%s(): mmap_remove_dynamic_region() failed"
+ " unexpectedly rc=%d\n", __func__, rc);
+ panic();
+ }
+
+ return SUCCESS;
+}
+
+/*
+ * Note: accesses to the dynamic launch args, and to the DLME data are
+ * little-endian as required, thanks to TF-A BL31 init requirements.
+ */
+static enum drtm_retc drtm_dl_check_args(uint64_t x1,
+ struct_drtm_dl_args *a_out)
+{
+ uint64_t dlme_start, dlme_end;
+ uint64_t dlme_img_start, dlme_img_ep, dlme_img_end;
+ uint64_t dlme_data_start, dlme_data_end;
+ uintptr_t va_mapping;
+ size_t va_mapping_size;
+ struct_drtm_dl_args *a;
+ struct_drtm_dl_args args_buf;
+ int rc;
+
+ if (x1 % DRTM_PAGE_SIZE != 0) {
+ ERROR("DRTM: parameters structure is not "
+ DRTM_PAGE_SIZE_STR "-aligned\n");
+ return INVALID_PARAMETERS;
+ }
+
+ va_mapping_size = ALIGNED_UP(sizeof(struct_drtm_dl_args), DRTM_PAGE_SIZE);
+
+ /* check DRTM parameters are within NS address region */
+ rc = plat_drtm_validate_ns_region(x1, va_mapping_size);
+ if (rc != 0) {
+ ERROR("DRTM: parameters lies within secure memory\n");
+ return INVALID_PARAMETERS;
+ }
+
+ rc = mmap_add_dynamic_region_alloc_va(x1, &va_mapping, va_mapping_size,
+ MT_MEMORY | MT_NS | MT_RO |
+ MT_SHAREABILITY_ISH);
+ if (rc != 0) {
+ WARN("DRTM: %s: mmap_add_dynamic_region() failed rc=%d\n",
+ __func__, rc);
+ return INTERNAL_ERROR;
+ }
+ a = (struct_drtm_dl_args *)va_mapping;
+
+ /* Sanitize cache of data passed in args by the DCE Preamble. */
+ flush_dcache_range(va_mapping, va_mapping_size);
+
+ args_buf = *a;
+
+ rc = mmap_remove_dynamic_region(va_mapping, va_mapping_size);
+ if (rc) {
+ ERROR("%s(): mmap_remove_dynamic_region() failed unexpectedly"
+ " rc=%d\n", __func__, rc);
+ panic();
+ }
+ a = &args_buf;
+
+ if (!((a->version >= ARM_DRTM_PARAMS_MIN_VERSION) &&
+ (a->version <= ARM_DRTM_PARAMS_MAX_VERSION))) {
+ ERROR("DRTM: parameters structure version %u is unsupported\n",
+ a->version);
+ return NOT_SUPPORTED;
+ }
+
+ if (!(a->dlme_img_off < a->dlme_size &&
+ a->dlme_data_off < a->dlme_size)) {
+ ERROR("DRTM: argument offset is outside of the DLME region\n");
+ return INVALID_PARAMETERS;
+ }
+ dlme_start = a->dlme_paddr;
+ dlme_end = a->dlme_paddr + a->dlme_size;
+ dlme_img_start = a->dlme_paddr + a->dlme_img_off;
+ dlme_img_ep = dlme_img_start + a->dlme_img_ep_off;
+ dlme_img_end = dlme_img_start + a->dlme_img_size;
+ dlme_data_start = a->dlme_paddr + a->dlme_data_off;
+ dlme_data_end = dlme_end;
+
+ /* Check the DLME regions arguments. */
+ if ((dlme_start % DRTM_PAGE_SIZE) != 0) {
+ ERROR("DRTM: argument DLME region is not "
+ DRTM_PAGE_SIZE_STR "-aligned\n");
+ return INVALID_PARAMETERS;
+ }
+
+ if (!(dlme_start < dlme_end &&
+ dlme_start <= dlme_img_start && dlme_img_start < dlme_img_end &&
+ dlme_start <= dlme_data_start && dlme_data_start < dlme_data_end)) {
+ ERROR("DRTM: argument DLME region is discontiguous\n");
+ return INVALID_PARAMETERS;
+ }
+
+ if (dlme_img_start < dlme_data_end && dlme_data_start < dlme_img_end) {
+ ERROR("DRTM: argument DLME regions overlap\n");
+ return INVALID_PARAMETERS;
+ }
+
+ /* Check the DLME image region arguments. */
+ if ((dlme_img_start % DRTM_PAGE_SIZE) != 0) {
+ ERROR("DRTM: argument DLME image region is not "
+ DRTM_PAGE_SIZE_STR "-aligned\n");
+ return INVALID_PARAMETERS;
+ }
+
+ if (!(dlme_img_start <= dlme_img_ep && dlme_img_ep < dlme_img_end)) {
+ ERROR("DRTM: DLME entry point is outside of the DLME image region\n");
+ return INVALID_PARAMETERS;
+ }
+
+ if ((dlme_img_ep % 4) != 0) {
+ ERROR("DRTM: DLME image entry point is not 4-byte-aligned\n");
+ return INVALID_PARAMETERS;
+ }
+
+ /* Check the DLME data region arguments. */
+ if ((dlme_data_start % DRTM_PAGE_SIZE) != 0) {
+ ERROR("DRTM: argument DLME data region is not "
+ DRTM_PAGE_SIZE_STR "-aligned\n");
+ return INVALID_PARAMETERS;
+ }
+
+ if (dlme_data_end - dlme_data_start < dlme_data_min_size) {
+ ERROR("DRTM: argument DLME data region is short of %lu bytes\n",
+ dlme_data_min_size - (size_t)(dlme_data_end - dlme_data_start));
+ return INVALID_PARAMETERS;
+ }
+
+ /* check DLME region (paddr + size) is within a NS address region */
+ rc = plat_drtm_validate_ns_region(dlme_start, (size_t)a->dlme_size);
+ if (rc != 0) {
+ ERROR("DRTM: DLME region lies within secure memory\n");
+ return INVALID_PARAMETERS;
+ }
+
+ /* Check the Normal World DCE region arguments. */
+ if (a->dce_nwd_paddr != 0) {
+ uint32_t dce_nwd_start = a->dce_nwd_paddr;
+ uint32_t dce_nwd_end = dce_nwd_start + a->dce_nwd_size;
+
+ if (!(dce_nwd_start < dce_nwd_end)) {
+ ERROR("DRTM: argument Normal World DCE region is dicontiguous\n");
+ return INVALID_PARAMETERS;
+ }
+
+ if (dce_nwd_start < dlme_end && dlme_start < dce_nwd_end) {
+ ERROR("DRTM: argument Normal World DCE regions overlap\n");
+ return INVALID_PARAMETERS;
+ }
+ }
+
+ /*
+ * Map and sanitize the cache of data range passed by DCE Preamble. This
+ * is required to avoid / defend against racing with cache evictions
+ */
+ va_mapping_size = ALIGNED_UP((dlme_end - dlme_start), DRTM_PAGE_SIZE);
+ rc = mmap_add_dynamic_region_alloc_va(dlme_img_start, &va_mapping, va_mapping_size,
+ MT_MEMORY | MT_NS | MT_RO |
+ MT_SHAREABILITY_ISH);
+ if (rc != 0) {
+ ERROR("DRTM: %s: mmap_add_dynamic_region_alloc_va() failed rc=%d\n",
+ __func__, rc);
+ return INTERNAL_ERROR;
+ }
+ flush_dcache_range(va_mapping, va_mapping_size);
+
+ rc = mmap_remove_dynamic_region(va_mapping, va_mapping_size);
+ if (rc) {
+ ERROR("%s(): mmap_remove_dynamic_region() failed unexpectedly"
+ " rc=%d\n", __func__, rc);
+ panic();
+ }
+
+ *a_out = *a;
+ return SUCCESS;
+}
+
+static void drtm_dl_reset_dlme_el_state(enum drtm_dlme_el dlme_el)
+{
+ uint64_t sctlr;
+
+ /*
+ * TODO: Set PE state according to the PSCI's specification of the initial
+ * state after CPU_ON, or to reset values if unspecified, where they exist,
+ * or define sensible values otherwise.
+ */
+
+ switch (dlme_el) {
+ case DLME_AT_EL1:
+ sctlr = read_sctlr_el1();
+ break;
+
+ case DLME_AT_EL2:
+ sctlr = read_sctlr_el2();
+ break;
+
+ default: /* Not reached */
+ ERROR("%s(): dlme_el has the unexpected value %d\n",
+ __func__, dlme_el);
+ panic();
+ }
+
+ sctlr &= ~(/* Disable DLME's EL MMU, since the existing page-tables are untrusted. */
+ SCTLR_M_BIT
+ | SCTLR_EE_BIT /* Little-endian data accesses. */
+ );
+
+ sctlr |= SCTLR_C_BIT | SCTLR_I_BIT; /* Allow instruction and data caching. */
+
+ switch (dlme_el) {
+ case DLME_AT_EL1:
+ write_sctlr_el1(sctlr);
+ break;
+
+ case DLME_AT_EL2:
+ write_sctlr_el2(sctlr);
+ break;
+ }
+}
+
+static void drtm_dl_reset_dlme_context(enum drtm_dlme_el dlme_el)
+{
+ void *ns_ctx = cm_get_context(NON_SECURE);
+ gp_regs_t *gpregs = get_gpregs_ctx(ns_ctx);
+ uint64_t spsr_el3 = read_ctx_reg(get_el3state_ctx(ns_ctx), CTX_SPSR_EL3);
+
+ /* Reset all gpregs, including SP_EL0. */
+ memset(gpregs, 0, sizeof(*gpregs));
+
+ /* Reset SP_ELx. */
+ switch (dlme_el) {
+ case DLME_AT_EL1:
+ write_sp_el1(0);
+ break;
+
+ case DLME_AT_EL2:
+ write_sp_el2(0);
+ break;
+ }
+
+ /*
+ * DLME's async exceptions are masked to avoid a NWd attacker's timed
+ * interference with any state we established trust in or measured.
+ */
+ spsr_el3 |= SPSR_DAIF_MASK << SPSR_DAIF_SHIFT;
+
+ write_ctx_reg(get_el3state_ctx(ns_ctx), CTX_SPSR_EL3, spsr_el3);
+}
+
+static void drtm_dl_prepare_eret_to_dlme(const struct_drtm_dl_args *args, enum drtm_dlme_el dlme_el)
+{
+ void *ctx = cm_get_context(NON_SECURE);
+ uint64_t dlme_ep = DL_ARGS_GET_DLME_ENTRY_POINT(args);
+ uint64_t spsr_el3 = read_ctx_reg(get_el3state_ctx(ctx), CTX_SPSR_EL3);
+
+ /* Next ERET is to the DLME's EL. */
+ spsr_el3 &= ~(MODE_EL_MASK << MODE_EL_SHIFT);
+ switch (dlme_el) {
+ case DLME_AT_EL1:
+ spsr_el3 |= MODE_EL1 << MODE_EL_SHIFT;
+ break;
+
+ case DLME_AT_EL2:
+ spsr_el3 |= MODE_EL2 << MODE_EL_SHIFT;
+ break;
+ }
+
+ /* Next ERET is to the DLME entry point. */
+ cm_set_elr_spsr_el3(NON_SECURE, dlme_ep, spsr_el3);
+}
+
+static uint64_t drtm_dynamic_launch(uint64_t x1, void *handle)
+{
+ enum drtm_retc ret = SUCCESS;
+ enum drtm_retc dma_prot_ret;
+ struct_drtm_dl_args args;
+ /* DLME should be highest NS exception level */
+ enum drtm_dlme_el dlme_el = (el_implemented(2) != EL_IMPL_NONE) ? MODE_EL2 : MODE_EL1;
+
+ /* Ensure that only boot PE is powered on */
+ ret = drtm_dl_check_cores();
+ if (ret != SUCCESS) {
+ SMC_RET1(handle, ret);
+ }
+
+ /*
+ * Ensure that execution state is AArch64 and the caller
+ * is highest non-secure exception level
+ */
+ ret = drtm_dl_check_caller_el(handle);
+ if (ret != SUCCESS) {
+ SMC_RET1(handle, ret);
+ }
+
+ ret = drtm_dl_check_args(x1, &args);
+ if (ret != SUCCESS) {
+ SMC_RET1(handle, ret);
+ }
+
+ /* Ensure that there are no SDEI event registered */
+#if SDEI_SUPPORT
+ if (sdei_get_registered_event_count() != 0) {
+ SMC_RET1(handle, DENIED);
+ }
+#endif /* SDEI_SUPPORT */
+
+ /*
+ * Engage the DMA protections. The launch cannot proceed without the DMA
+ * protections due to potential TOC/TOU vulnerabilities w.r.t. the DLME
+ * region (and to the NWd DCE region).
+ */
+ ret = drtm_dma_prot_engage(&args.dma_prot_args,
+ DL_ARGS_GET_DMA_PROT_TYPE(&args));
+ if (ret != SUCCESS) {
+ SMC_RET1(handle, ret);
+ }
+
+ /*
+ * The DMA protection is now engaged. Note that any failure mode that
+ * returns an error to the DRTM-launch caller must now disengage DMA
+ * protections before returning to the caller.
+ */
+
+ ret = drtm_take_measurements(&args);
+ if (ret != SUCCESS) {
+ goto err_undo_dma_prot;
+ }
+
+ ret = drtm_dl_prepare_dlme_data(&args);
+ if (ret != SUCCESS) {
+ goto err_undo_dma_prot;
+ }
+
+ /*
+ * Note that, at the time of writing, the DRTM spec allows a successful
+ * launch from NS-EL1 to return to a DLME in NS-EL2. The practical risk
+ * of a privilege escalation, e.g. due to a compromised hypervisor, is
+ * considered small enough not to warrant the specification of additional
+ * DRTM conduits that would be necessary to maintain OSs' abstraction from
+ * the presence of EL2 were the dynamic launch only be allowed from the
+ * highest NS EL.
+ */
+
+ dlme_el = (el_implemented(2) != EL_IMPL_NONE) ? MODE_EL2 : MODE_EL1;
+
+ drtm_dl_reset_dlme_el_state(dlme_el);
+ drtm_dl_reset_dlme_context(dlme_el);
+
+ drtm_dl_prepare_eret_to_dlme(&args, dlme_el);
+
+ /*
+ * As per DRTM beta0 spec table #28 invalidate the instruction cache
+ * before jumping to the DLME. This is required to defend against
+ * potentially-malicious cache contents.
+ */
+ invalidate_icache_all();
+
+ /* Return the DLME region's address in x0, and the DLME data offset in x1.*/
+ SMC_RET2(handle, args.dlme_paddr, args.dlme_data_off);
+
+err_undo_dma_prot:
+ dma_prot_ret = drtm_dma_prot_disengage();
+ if (dma_prot_ret != SUCCESS) {
+ ERROR("%s(): drtm_dma_prot_disengage() failed unexpectedly"
+ " rc=%d\n", __func__, ret);
+ panic();
+ }
+
+ SMC_RET1(handle, ret);
+}
+
+uint64_t drtm_smc_handler(uint32_t smc_fid,
+ uint64_t x1,
+ uint64_t x2,
+ uint64_t x3,
+ uint64_t x4,
+ void *cookie,
+ void *handle,
+ uint64_t flags)
+{
+ /* Check that the SMC call is from the Normal World. */
+ if (!is_caller_non_secure(flags)) {
+ SMC_RET1(handle, NOT_SUPPORTED);
+ }
+
+ switch (smc_fid) {
+ case ARM_DRTM_SVC_VERSION:
+ INFO("DRTM service handler: version\n");
+ /* Return the version of current implementation */
+ SMC_RET1(handle, ARM_DRTM_VERSION);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_FEATURES:
+ if (((x1 >> ARM_DRTM_FUNC_SHIFT) & ARM_DRTM_FUNC_MASK) ==
+ ARM_DRTM_FUNC_ID) {
+ /* Dispatch function-based queries. */
+ switch (x1 & FUNCID_MASK) {
+ case ARM_DRTM_SVC_VERSION:
+ SMC_RET1(handle, SUCCESS);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_FEATURES:
+ SMC_RET1(handle, SUCCESS);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_UNPROTECT_MEM:
+ SMC_RET1(handle, SUCCESS);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_DYNAMIC_LAUNCH:
+ SMC_RET1(handle, SUCCESS);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_CLOSE_LOCALITY:
+ WARN("ARM_DRTM_SVC_CLOSE_LOCALITY feature %s",
+ "is not supported\n");
+ SMC_RET1(handle, NOT_SUPPORTED);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_GET_ERROR:
+ SMC_RET1(handle, SUCCESS);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_SET_ERROR:
+ SMC_RET1(handle, SUCCESS);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_SET_TCB_HASH:
+ WARN("ARM_DRTM_SVC_TCB_HASH feature %s",
+ "is not supported\n");
+ SMC_RET1(handle, NOT_SUPPORTED);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_LOCK_TCB_HASH:
+ WARN("ARM_DRTM_SVC_LOCK_TCB_HASH feature %s",
+ "is not supported\n");
+ SMC_RET1(handle, NOT_SUPPORTED);
+ break; /* not reached */
+
+ default:
+ ERROR("Unknown DRTM service function\n");
+ SMC_RET1(handle, NOT_SUPPORTED);
+ break; /* not reached */
+ }
+ } else {
+ /* Dispatch feature-based queries. */
+ switch (x1 & ARM_DRTM_FEAT_ID_MASK) {
+ case ARM_DRTM_FEATURES_TPM:
+ INFO("++ DRTM service handler: TPM features\n");
+ return drtm_features_tpm(handle);
+ break; /* not reached */
+
+ case ARM_DRTM_FEATURES_MEM_REQ:
+ INFO("++ DRTM service handler: Min. mem."
+ " requirement features\n");
+ return drtm_features_mem_req(handle);
+ break; /* not reached */
+
+ case ARM_DRTM_FEATURES_DMA_PROT:
+ INFO("++ DRTM service handler: "
+ "DMA protection features\n");
+ return drtm_features_dma_prot(handle);
+ break; /* not reached */
+
+ case ARM_DRTM_FEATURES_BOOT_PE_ID:
+ INFO("++ DRTM service handler: "
+ "Boot PE ID features\n");
+ return drtm_features_boot_pe_id(handle);
+ break; /* not reached */
+
+ case ARM_DRTM_FEATURES_TCB_HASHES:
+ INFO("++ DRTM service handler: "
+ "TCB-hashes features\n");
+ return drtm_features_tcb_hashes(handle);
+ break; /* not reached */
+
+ default:
+ ERROR("Unknown ARM DRTM service feature\n");
+ SMC_RET1(handle, NOT_SUPPORTED);
+ break; /* not reached */
+ }
+ }
+
+ case ARM_DRTM_SVC_UNPROTECT_MEM:
+ INFO("DRTM service handler: unprotect mem\n");
+ return drtm_unprotect_mem(handle);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_DYNAMIC_LAUNCH:
+ INFO("DRTM service handler: dynamic launch\n");
+ return drtm_dynamic_launch(x1, handle);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_CLOSE_LOCALITY:
+ WARN("DRTM service handler: close locality %s\n",
+ "is not supported");
+ SMC_RET1(handle, NOT_SUPPORTED);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_GET_ERROR:
+ INFO("DRTM service handler: get error\n");
+ drtm_get_error(handle);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_SET_ERROR:
+ INFO("DRTM service handler: set error\n");
+ drtm_set_error(x1, handle);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_SET_TCB_HASH:
+ WARN("DRTM service handler: set TCB hash %s\n",
+ "is not supported");
+ SMC_RET1(handle, NOT_SUPPORTED);
+ break; /* not reached */
+
+ case ARM_DRTM_SVC_LOCK_TCB_HASH:
+ WARN("DRTM service handler: lock TCB hash %s\n",
+ "is not supported");
+ SMC_RET1(handle, NOT_SUPPORTED);
+ break; /* not reached */
+
+ default:
+ ERROR("Unknown DRTM service function: 0x%x\n", smc_fid);
+ SMC_RET1(handle, SMC_UNK);
+ break; /* not reached */
+ }
+
+ /* not reached */
+ SMC_RET1(handle, SMC_UNK);
+}