diff options
Diffstat (limited to 'services/std_svc/drtm/drtm_main.c')
| -rw-r--r-- | services/std_svc/drtm/drtm_main.c | 839 |
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); +} |