| /* |
| * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arm_arch_svc.h> |
| #include <debug.h> |
| #include <errata_report.h> |
| #include <runtime_svc.h> |
| #include <smccc.h> |
| #include <smccc_helpers.h> |
| #include <wa_cve_2017_5715.h> |
| |
| static int32_t smccc_version(void) |
| { |
| return MAKE_SMCCC_VERSION(SMCCC_MAJOR_VERSION, SMCCC_MINOR_VERSION); |
| } |
| |
| static int32_t smccc_arch_features(u_register_t arg) |
| { |
| switch (arg) { |
| case SMCCC_VERSION: |
| case SMCCC_ARCH_FEATURES: |
| return SMC_OK; |
| #if WORKAROUND_CVE_2017_5715 |
| case SMCCC_ARCH_WORKAROUND_1: |
| if (check_wa_cve_2017_5715() == ERRATA_NOT_APPLIES) |
| return 1; |
| return 0; /* ERRATA_APPLIES || ERRATA_MISSING */ |
| #endif |
| #if WORKAROUND_CVE_2018_3639 |
| case SMCCC_ARCH_WORKAROUND_2: |
| return SMCCC_ARCH_NOT_REQUIRED; |
| #endif |
| default: |
| return SMC_UNK; |
| } |
| } |
| |
| /* |
| * Top-level Arm Architectural Service SMC handler. |
| */ |
| static uintptr_t arm_arch_svc_smc_handler(uint32_t smc_fid, |
| u_register_t x1, |
| u_register_t x2, |
| u_register_t x3, |
| u_register_t x4, |
| void *cookie, |
| void *handle, |
| u_register_t flags) |
| { |
| switch (smc_fid) { |
| case SMCCC_VERSION: |
| SMC_RET1(handle, smccc_version()); |
| case SMCCC_ARCH_FEATURES: |
| SMC_RET1(handle, smccc_arch_features(x1)); |
| #if WORKAROUND_CVE_2017_5715 |
| case SMCCC_ARCH_WORKAROUND_1: |
| /* |
| * The workaround has already been applied on affected PEs |
| * during entry to EL3. On unaffected PEs, this function |
| * has no effect. |
| */ |
| SMC_RET0(handle); |
| #endif |
| #if WORKAROUND_CVE_2018_3639 |
| case SMCCC_ARCH_WORKAROUND_2: |
| /* |
| * The workaround has already been applied on affected PEs |
| * requiring dynamic mitigation during entry to EL3. |
| * On unaffected or statically mitigated PEs, this function |
| * has no effect. |
| */ |
| SMC_RET0(handle); |
| #endif |
| default: |
| WARN("Unimplemented Arm Architecture Service Call: 0x%x \n", |
| smc_fid); |
| SMC_RET1(handle, SMC_UNK); |
| } |
| } |
| |
| /* Register Standard Service Calls as runtime service */ |
| DECLARE_RT_SVC( |
| arm_arch_svc, |
| OEN_ARM_START, |
| OEN_ARM_END, |
| SMC_TYPE_FAST, |
| NULL, |
| arm_arch_svc_smc_handler |
| ); |