| /* |
| * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <assert.h> |
| #include <errno.h> |
| |
| #include <arch_helpers.h> |
| #include <bl31/bl31.h> |
| #include <bl31/ehf.h> |
| #include <common/debug.h> |
| #include <common/fdt_wrappers.h> |
| #include <common/runtime_svc.h> |
| #include <lib/el3_runtime/context_mgmt.h> |
| #include <lib/smccc.h> |
| #include <lib/utils.h> |
| #include <lib/xlat_tables/xlat_tables_v2.h> |
| #include <libfdt.h> |
| #include <plat/common/platform.h> |
| #include <services/ffa_svc.h> |
| #include <services/spmc_svc.h> |
| #include <services/spmd_svc.h> |
| #include "spmc.h" |
| |
| #include <platform_def.h> |
| |
| /* |
| * Allocate a secure partition descriptor to describe each SP in the system that |
| * does not reside at EL3. |
| */ |
| static struct secure_partition_desc sp_desc[SECURE_PARTITION_COUNT]; |
| |
| /* |
| * Allocate an NS endpoint descriptor to describe each VM and the Hypervisor in |
| * the system that interacts with a SP. It is used to track the Hypervisor |
| * buffer pair, version and ID for now. It could be extended to track VM |
| * properties when the SPMC supports indirect messaging. |
| */ |
| static struct ns_endpoint_desc ns_ep_desc[NS_PARTITION_COUNT]; |
| |
| /* |
| * Helper function to obtain the descriptor of the last SP to whom control was |
| * handed to on this physical cpu. Currently, we assume there is only one SP. |
| * TODO: Expand to track multiple partitions when required. |
| */ |
| struct secure_partition_desc *spmc_get_current_sp_ctx(void) |
| { |
| return &(sp_desc[ACTIVE_SP_DESC_INDEX]); |
| } |
| |
| /* |
| * Helper function to obtain the execution context of an SP on the |
| * current physical cpu. |
| */ |
| struct sp_exec_ctx *spmc_get_sp_ec(struct secure_partition_desc *sp) |
| { |
| return &(sp->ec[get_ec_index(sp)]); |
| } |
| |
| /* Helper function to get pointer to SP context from its ID. */ |
| struct secure_partition_desc *spmc_get_sp_ctx(uint16_t id) |
| { |
| /* Check for SWd Partitions. */ |
| for (unsigned int i = 0U; i < SECURE_PARTITION_COUNT; i++) { |
| if (sp_desc[i].sp_id == id) { |
| return &(sp_desc[i]); |
| } |
| } |
| return NULL; |
| } |
| |
| /****************************************************************************** |
| * This function returns to the place where spmc_sp_synchronous_entry() was |
| * called originally. |
| ******************************************************************************/ |
| __dead2 void spmc_sp_synchronous_exit(struct sp_exec_ctx *ec, uint64_t rc) |
| { |
| /* |
| * The SPM must have initiated the original request through a |
| * synchronous entry into the secure partition. Jump back to the |
| * original C runtime context with the value of rc in x0; |
| */ |
| spm_secure_partition_exit(ec->c_rt_ctx, rc); |
| |
| panic(); |
| } |
| |
| /******************************************************************************* |
| * Return FFA_ERROR with specified error code. |
| ******************************************************************************/ |
| uint64_t spmc_ffa_error_return(void *handle, int error_code) |
| { |
| SMC_RET8(handle, FFA_ERROR, |
| FFA_TARGET_INFO_MBZ, error_code, |
| FFA_PARAM_MBZ, FFA_PARAM_MBZ, FFA_PARAM_MBZ, |
| FFA_PARAM_MBZ, FFA_PARAM_MBZ); |
| } |
| |
| /****************************************************************************** |
| * Helper function to validate a secure partition ID to ensure it does not |
| * conflict with any other FF-A component and follows the convention to |
| * indicate it resides within the secure world. |
| ******************************************************************************/ |
| bool is_ffa_secure_id_valid(uint16_t partition_id) |
| { |
| /* Ensure the ID is not the invalid partition ID. */ |
| if (partition_id == INV_SP_ID) { |
| return false; |
| } |
| |
| /* Ensure the ID is not the SPMD ID. */ |
| if (partition_id == SPMD_DIRECT_MSG_ENDPOINT_ID) { |
| return false; |
| } |
| |
| /* |
| * Ensure the ID follows the convention to indicate it resides |
| * in the secure world. |
| */ |
| if (!ffa_is_secure_world_id(partition_id)) { |
| return false; |
| } |
| |
| /* Ensure we don't conflict with the SPMC partition ID. */ |
| if (partition_id == FFA_SPMC_ID) { |
| return false; |
| } |
| |
| /* Ensure we do not already have an SP context with this ID. */ |
| if (spmc_get_sp_ctx(partition_id)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /******************************************************************************* |
| * This function will parse the Secure Partition Manifest. From manifest, it |
| * will fetch details for preparing Secure partition image context and secure |
| * partition image boot arguments if any. |
| ******************************************************************************/ |
| static int sp_manifest_parse(void *sp_manifest, int offset, |
| struct secure_partition_desc *sp, |
| entry_point_info_t *ep_info) |
| { |
| int32_t ret, node; |
| uint32_t config_32; |
| |
| /* |
| * Look for the mandatory fields that are expected to be present in |
| * the SP manifests. |
| */ |
| node = fdt_path_offset(sp_manifest, "/"); |
| if (node < 0) { |
| ERROR("Did not find root node.\n"); |
| return node; |
| } |
| |
| ret = fdt_read_uint32(sp_manifest, node, "exception-level", &config_32); |
| if (ret != 0) { |
| ERROR("Missing SP Exception Level information.\n"); |
| return ret; |
| } |
| |
| sp->runtime_el = config_32; |
| |
| ret = fdt_read_uint32(sp_manifest, node, "ffa-version", &config_32); |
| if (ret != 0) { |
| ERROR("Missing Secure Partition FF-A Version.\n"); |
| return ret; |
| } |
| |
| sp->ffa_version = config_32; |
| |
| ret = fdt_read_uint32(sp_manifest, node, "execution-state", &config_32); |
| if (ret != 0) { |
| ERROR("Missing Secure Partition Execution State.\n"); |
| return ret; |
| } |
| |
| sp->execution_state = config_32; |
| |
| /* |
| * Look for the optional fields that are expected to be present in |
| * an SP manifest. |
| */ |
| ret = fdt_read_uint32(sp_manifest, node, "id", &config_32); |
| if (ret != 0) { |
| WARN("Missing Secure Partition ID.\n"); |
| } else { |
| if (!is_ffa_secure_id_valid(config_32)) { |
| ERROR("Invalid Secure Partition ID (0x%x).\n", |
| config_32); |
| return -EINVAL; |
| } |
| sp->sp_id = config_32; |
| } |
| |
| return 0; |
| } |
| |
| /******************************************************************************* |
| * This function gets the Secure Partition Manifest base and maps the manifest |
| * region. |
| * Currently only one Secure Partition manifest is considered which is used to |
| * prepare the context for the single Secure Partition. |
| ******************************************************************************/ |
| static int find_and_prepare_sp_context(void) |
| { |
| void *sp_manifest; |
| uintptr_t manifest_base; |
| uintptr_t manifest_base_align; |
| entry_point_info_t *next_image_ep_info; |
| int32_t ret; |
| struct secure_partition_desc *sp; |
| |
| next_image_ep_info = bl31_plat_get_next_image_ep_info(SECURE); |
| if (next_image_ep_info == NULL) { |
| WARN("No Secure Partition image provided by BL2.\n"); |
| return -ENOENT; |
| } |
| |
| sp_manifest = (void *)next_image_ep_info->args.arg0; |
| if (sp_manifest == NULL) { |
| WARN("Secure Partition manifest absent.\n"); |
| return -ENOENT; |
| } |
| |
| manifest_base = (uintptr_t)sp_manifest; |
| manifest_base_align = page_align(manifest_base, DOWN); |
| |
| /* |
| * Map the secure partition manifest region in the EL3 translation |
| * regime. |
| * Map an area equal to (2 * PAGE_SIZE) for now. During manifest base |
| * alignment the region of 1 PAGE_SIZE from manifest align base may |
| * not completely accommodate the secure partition manifest region. |
| */ |
| ret = mmap_add_dynamic_region((unsigned long long)manifest_base_align, |
| manifest_base_align, |
| PAGE_SIZE * 2, |
| MT_RO_DATA); |
| if (ret != 0) { |
| ERROR("Error while mapping SP manifest (%d).\n", ret); |
| return ret; |
| } |
| |
| ret = fdt_node_offset_by_compatible(sp_manifest, -1, |
| "arm,ffa-manifest-1.0"); |
| if (ret < 0) { |
| ERROR("Error happened in SP manifest reading.\n"); |
| return -EINVAL; |
| } |
| |
| /* |
| * Store the size of the manifest so that it can be used later to pass |
| * the manifest as boot information later. |
| */ |
| next_image_ep_info->args.arg1 = fdt_totalsize(sp_manifest); |
| INFO("Manifest size = %lu bytes.\n", next_image_ep_info->args.arg1); |
| |
| /* |
| * Select an SP descriptor for initialising the partition's execution |
| * context on the primary CPU. |
| */ |
| sp = spmc_get_current_sp_ctx(); |
| |
| /* Initialize entry point information for the SP */ |
| SET_PARAM_HEAD(next_image_ep_info, PARAM_EP, VERSION_1, |
| SECURE | EP_ST_ENABLE); |
| |
| /* Parse the SP manifest. */ |
| ret = sp_manifest_parse(sp_manifest, ret, sp, next_image_ep_info); |
| if (ret != 0) { |
| ERROR("Error in Secure Partition manifest parsing.\n"); |
| return ret; |
| } |
| |
| /* Check that the runtime EL in the manifest was correct. */ |
| if (sp->runtime_el != S_EL1) { |
| ERROR("Unexpected runtime EL: %d\n", sp->runtime_el); |
| return -EINVAL; |
| } |
| |
| /* Perform any common initialisation. */ |
| spmc_sp_common_setup(sp, next_image_ep_info); |
| |
| /* Perform any initialisation specific to S-EL1 SPs. */ |
| spmc_el1_sp_setup(sp, next_image_ep_info); |
| |
| /* Initialize the SP context with the required ep info. */ |
| spmc_sp_common_ep_commit(sp, next_image_ep_info); |
| |
| return 0; |
| } |
| |
| /******************************************************************************* |
| * This function takes an SP context pointer and performs a synchronous entry |
| * into it. |
| ******************************************************************************/ |
| uint64_t spmc_sp_synchronous_entry(struct sp_exec_ctx *ec) |
| { |
| uint64_t rc; |
| |
| assert(ec != NULL); |
| |
| /* Assign the context of the SP to this CPU */ |
| cm_set_context(&(ec->cpu_ctx), SECURE); |
| |
| /* Restore the context assigned above */ |
| cm_el1_sysregs_context_restore(SECURE); |
| cm_set_next_eret_context(SECURE); |
| |
| /* Invalidate TLBs at EL1. */ |
| tlbivmalle1(); |
| dsbish(); |
| |
| /* Enter Secure Partition */ |
| rc = spm_secure_partition_enter(&ec->c_rt_ctx); |
| |
| /* Save secure state */ |
| cm_el1_sysregs_context_save(SECURE); |
| |
| return rc; |
| } |
| |
| /******************************************************************************* |
| * SPMC Helper Functions. |
| ******************************************************************************/ |
| static int32_t sp_init(void) |
| { |
| uint64_t rc; |
| struct secure_partition_desc *sp; |
| struct sp_exec_ctx *ec; |
| |
| sp = spmc_get_current_sp_ctx(); |
| ec = spmc_get_sp_ec(sp); |
| ec->rt_model = RT_MODEL_INIT; |
| ec->rt_state = RT_STATE_RUNNING; |
| |
| INFO("Secure Partition (0x%x) init start.\n", sp->sp_id); |
| |
| rc = spmc_sp_synchronous_entry(ec); |
| if (rc != 0) { |
| /* Indicate SP init was not successful. */ |
| ERROR("SP (0x%x) failed to initialize (%lu).\n", |
| sp->sp_id, rc); |
| return 0; |
| } |
| |
| ec->rt_state = RT_STATE_WAITING; |
| INFO("Secure Partition initialized.\n"); |
| |
| return 1; |
| } |
| |
| static void initalize_sp_descs(void) |
| { |
| struct secure_partition_desc *sp; |
| |
| for (unsigned int i = 0U; i < SECURE_PARTITION_COUNT; i++) { |
| sp = &sp_desc[i]; |
| sp->sp_id = INV_SP_ID; |
| sp->secondary_ep = 0; |
| } |
| } |
| |
| static void initalize_ns_ep_descs(void) |
| { |
| struct ns_endpoint_desc *ns_ep; |
| |
| for (unsigned int i = 0U; i < NS_PARTITION_COUNT; i++) { |
| ns_ep = &ns_ep_desc[i]; |
| /* |
| * Clashes with the Hypervisor ID but will not be a |
| * problem in practice. |
| */ |
| ns_ep->ns_ep_id = 0; |
| ns_ep->ffa_version = 0; |
| } |
| } |
| |
| /******************************************************************************* |
| * Initialize SPMC attributes for the SPMD. |
| ******************************************************************************/ |
| void spmc_populate_attrs(spmc_manifest_attribute_t *spmc_attrs) |
| { |
| spmc_attrs->major_version = FFA_VERSION_MAJOR; |
| spmc_attrs->minor_version = FFA_VERSION_MINOR; |
| spmc_attrs->exec_state = MODE_RW_64; |
| spmc_attrs->spmc_id = FFA_SPMC_ID; |
| } |
| |
| /******************************************************************************* |
| * Initialize contexts of all Secure Partitions. |
| ******************************************************************************/ |
| int32_t spmc_setup(void) |
| { |
| int32_t ret; |
| |
| /* Initialize endpoint descriptors */ |
| initalize_sp_descs(); |
| initalize_ns_ep_descs(); |
| |
| /* Perform physical SP setup. */ |
| |
| /* Disable MMU at EL1 (initialized by BL2) */ |
| disable_mmu_icache_el1(); |
| |
| /* Initialize context of the SP */ |
| INFO("Secure Partition context setup start.\n"); |
| |
| ret = find_and_prepare_sp_context(); |
| if (ret != 0) { |
| ERROR("Error in SP finding and context preparation.\n"); |
| return ret; |
| } |
| |
| /* Register init function for deferred init. */ |
| bl31_register_bl32_init(&sp_init); |
| |
| INFO("Secure Partition setup done.\n"); |
| |
| return 0; |
| } |
| |
| /******************************************************************************* |
| * Secure Partition Manager SMC handler. |
| ******************************************************************************/ |
| uint64_t spmc_smc_handler(uint32_t smc_fid, |
| bool secure_origin, |
| uint64_t x1, |
| uint64_t x2, |
| uint64_t x3, |
| uint64_t x4, |
| void *cookie, |
| void *handle, |
| uint64_t flags) |
| { |
| switch (smc_fid) { |
| |
| default: |
| WARN("Unsupported FF-A call 0x%08x.\n", smc_fid); |
| break; |
| } |
| return spmc_ffa_error_return(handle, FFA_ERROR_NOT_SUPPORTED); |
| } |