| /* |
| * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * Neither the name of ARM nor the names of its contributors may be used |
| * to endorse or promote products derived from this software without specific |
| * prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| |
| /******************************************************************************* |
| * This is the Secure Payload Dispatcher (SPD). The dispatcher is meant to be a |
| * plug-in component to the Secure Monitor, registered as a runtime service. The |
| * SPD is expected to be a functional extension of the Secure Payload (SP) that |
| * executes in Secure EL1. The Secure Monitor will delegate all SMCs targeting |
| * the Trusted OS/Applications range to the dispatcher. The SPD will either |
| * handle the request locally or delegate it to the Secure Payload. It is also |
| * responsible for initialising and maintaining communication with the SP. |
| ******************************************************************************/ |
| #include <stdio.h> |
| #include <string.h> |
| #include <assert.h> |
| #include <arch_helpers.h> |
| #include <console.h> |
| #include <platform.h> |
| #include <psci_private.h> |
| #include <context_mgmt.h> |
| #include <runtime_svc.h> |
| #include <bl31.h> |
| #include <tsp.h> |
| #include <psci.h> |
| #include <tspd_private.h> |
| #include <debug.h> |
| |
| /******************************************************************************* |
| * Single structure to hold information about the various entry points into the |
| * Secure Payload. It is initialised once on the primary core after a cold boot. |
| ******************************************************************************/ |
| entry_info *tsp_entry_info; |
| |
| /******************************************************************************* |
| * Array to keep track of per-cpu Secure Payload state |
| ******************************************************************************/ |
| tsp_context tspd_sp_context[TSPD_CORE_COUNT]; |
| |
| /******************************************************************************* |
| * Secure Payload Dispatcher setup. The SPD finds out the SP entrypoint and type |
| * (aarch32/aarch64) if not already known and initialises the context for entry |
| * into the SP for its initialisation. |
| ******************************************************************************/ |
| int32_t tspd_setup(void) |
| { |
| el_change_info *image_info; |
| int32_t rc; |
| uint64_t mpidr = read_mpidr(); |
| uint32_t linear_id; |
| |
| linear_id = platform_get_core_pos(mpidr); |
| |
| /* |
| * Get information about the Secure Payload (BL32) image. Its |
| * absence is a critical failure. TODO: Add support to |
| * conditionally include the SPD service |
| */ |
| image_info = bl31_get_next_image_info(SECURE); |
| assert(image_info); |
| |
| /* |
| * We could inspect the SP image and determine it's execution |
| * state i.e whether AArch32 or AArch64. Assuming it's AArch64 |
| * for the time being. |
| */ |
| rc = tspd_init_secure_context(image_info->entrypoint, |
| TSP_AARCH64, |
| mpidr, |
| &tspd_sp_context[linear_id]); |
| assert(rc == 0); |
| |
| return rc; |
| } |
| |
| /******************************************************************************* |
| * This function passes control to the Secure Payload image (BL32) for the first |
| * time on the primary cpu after a cold boot. It assumes that a valid secure |
| * context has already been created by tspd_setup() which can be directly used. |
| * It also assumes that a valid non-secure context has been initialised by PSCI |
| * so it does not need to save and restore any non-secure state. This function |
| * performs a synchronous entry into the Secure payload. The SP passes control |
| * back to this routine through a SMC. It also passes the extents of memory made |
| * available to BL32 by BL31. |
| ******************************************************************************/ |
| int32_t bl32_init(meminfo *bl32_meminfo) |
| { |
| uint64_t mpidr = read_mpidr(); |
| uint32_t linear_id = platform_get_core_pos(mpidr); |
| uint64_t rc; |
| tsp_context *tsp_ctx = &tspd_sp_context[linear_id]; |
| |
| /* |
| * Arrange for passing a pointer to the meminfo structure |
| * describing the memory extents available to the secure |
| * payload. |
| * TODO: We are passing a pointer to BL31 internal memory |
| * whereas this structure should be copied to a communication |
| * buffer between the SP and SPD. |
| */ |
| write_ctx_reg(get_gpregs_ctx(&tsp_ctx->cpu_ctx), |
| CTX_GPREG_X0, |
| (uint64_t) bl32_meminfo); |
| |
| /* Arrange for an entry into the secure payload */ |
| rc = tspd_synchronous_sp_entry(tsp_ctx); |
| assert(rc != 0); |
| if (rc) |
| tsp_ctx->state = TSP_STATE_ON; |
| |
| return rc; |
| } |
| |
| /******************************************************************************* |
| * This function is responsible for handling all SMCs in the Trusted OS/App |
| * range from the non-secure state as defined in the SMC Calling Convention |
| * Document. It is also responsible for communicating with the Secure payload |
| * to delegate work and return results back to the non-secure state. Lastly it |
| * will also return any information that the secure payload needs to do the |
| * work assigned to it. |
| ******************************************************************************/ |
| uint64_t tspd_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) |
| { |
| unsigned long mpidr = read_mpidr(); |
| uint32_t linear_id = platform_get_core_pos(mpidr), ns; |
| |
| /* Determine which security state this SMC originated from */ |
| ns = is_caller_non_secure(flags); |
| |
| switch (smc_fid) { |
| |
| /* |
| * This function ID is used only by the SP to indicate it has |
| * finished initialising itself after a cold boot |
| */ |
| case TSP_ENTRY_DONE: |
| if (ns) |
| SMC_RET1(handle, SMC_UNK); |
| |
| /* |
| * Stash the SP entry points information. This is done |
| * only once on the primary cpu |
| */ |
| assert(tsp_entry_info == NULL); |
| tsp_entry_info = (entry_info *) x1; |
| |
| /* |
| * SP reports completion. The SPD must have initiated |
| * the original request through a synchronous entry |
| * into the SP. Jump back to the original C runtime |
| * context. |
| */ |
| tspd_synchronous_sp_exit(&tspd_sp_context[linear_id], x1); |
| |
| /* Should never reach here */ |
| assert(0); |
| |
| default: |
| panic(); |
| } |
| |
| SMC_RET1(handle, 0); |
| } |
| |
| /* Define a SPD runtime service descriptor */ |
| DECLARE_RT_SVC( |
| spd, |
| |
| OEN_TOS_START, |
| OEN_TOS_END, |
| SMC_TYPE_FAST, |
| tspd_setup, |
| tspd_smc_handler |
| ); |