| /* |
| * Copyright (c) 2018, Arm Limited. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch_helpers.h> |
| #include <assert.h> |
| #include <context_mgmt.h> |
| #include <debug.h> |
| #include <smccc.h> |
| #include <smccc_helpers.h> |
| #include <sprt_svc.h> |
| #include <utils.h> |
| |
| #include "spm_private.h" |
| |
| /******************************************************************************* |
| * This function handles all SMCs in the range reserved for SPRT. |
| ******************************************************************************/ |
| uint64_t sprt_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) |
| { |
| /* SPRT only supported from the Secure world */ |
| if (is_caller_non_secure(flags) == SMC_FROM_NON_SECURE) { |
| SMC_RET1(handle, SMC_UNK); |
| } |
| |
| assert(handle == cm_get_context(SECURE)); |
| |
| /* |
| * Only S-EL0 partitions are supported for now. Make the next ERET into |
| * the partition jump directly to S-EL0 instead of S-EL1. |
| */ |
| cm_set_elr_spsr_el3(SECURE, read_elr_el1(), read_spsr_el1()); |
| |
| switch (smc_fid) { |
| case SPRT_VERSION: |
| SMC_RET1(handle, SPRT_VERSION_COMPILED); |
| |
| case SPRT_PUT_RESPONSE_AARCH64: |
| /* |
| * Registers x1-x3 aren't saved by default to the context, |
| * but they are needed after spm_sp_synchronous_exit() because |
| * they hold return values. |
| */ |
| SMC_SET_GP(handle, CTX_GPREG_X1, x1); |
| SMC_SET_GP(handle, CTX_GPREG_X2, x2); |
| SMC_SET_GP(handle, CTX_GPREG_X3, x3); |
| spm_sp_synchronous_exit(SPRT_PUT_RESPONSE_AARCH64); |
| |
| case SPRT_YIELD_AARCH64: |
| spm_sp_synchronous_exit(SPRT_YIELD_AARCH64); |
| |
| default: |
| break; |
| } |
| |
| WARN("SPRT: Unsupported call 0x%08x\n", smc_fid); |
| SMC_RET1(handle, SPRT_NOT_SUPPORTED); |
| } |