1 /* 2 * Copyright (c) 2014-2020, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 9 #include <arch_helpers.h> 10 #include <drivers/console.h> 11 #if RAS_EXTENSION 12 #include <lib/extensions/ras.h> 13 #endif 14 #include <lib/extensions/twed.h> 15 #include <lib/xlat_tables/xlat_mmu_helpers.h> 16 #include <plat/common/platform.h> 17 18 /* 19 * The following platform setup functions are weakly defined. They 20 * provide typical implementations that may be re-used by multiple 21 * platforms but may also be overridden by a platform if required. 22 */ 23 #pragma weak bl31_plat_runtime_setup 24 #pragma weak plat_arm_set_twedel_scr_el3 25 26 #if SDEI_SUPPORT 27 #pragma weak plat_sdei_handle_masked_trigger 28 #pragma weak plat_sdei_validate_entry_point 29 #endif 30 31 #pragma weak plat_ea_handler 32 33 void bl31_plat_runtime_setup(void) 34 { 35 console_switch_state(CONSOLE_FLAG_RUNTIME); 36 } 37 38 /* 39 * Helper function for platform_get_pos() when platform compatibility is 40 * disabled. This is to enable SPDs using the older platform API to continue 41 * to work. 42 */ 43 unsigned int platform_core_pos_helper(unsigned long mpidr) 44 { 45 int idx = plat_core_pos_by_mpidr(mpidr); 46 assert(idx >= 0); 47 return idx; 48 } 49 50 #if SDEI_SUPPORT 51 /* 52 * Function that handles spurious SDEI interrupts while events are masked. 53 */ 54 void plat_sdei_handle_masked_trigger(uint64_t mpidr, unsigned int intr) 55 { 56 WARN("Spurious SDEI interrupt %u on masked PE %llx\n", intr, mpidr); 57 } 58 59 /* 60 * Default Function to validate SDEI entry point, which returns success. 61 * Platforms may override this with their own validation mechanism. 62 */ 63 int plat_sdei_validate_entry_point(uintptr_t ep, unsigned int client_mode) 64 { 65 return 0; 66 } 67 #endif 68 69 #if !ENABLE_BACKTRACE 70 static const char *get_el_str(unsigned int el) 71 { 72 if (el == MODE_EL3) { 73 return "EL3"; 74 } else if (el == MODE_EL2) { 75 return "EL2"; 76 } 77 return "S-EL1"; 78 } 79 #endif /* !ENABLE_BACKTRACE */ 80 81 /* RAS functions common to AArch64 ARM platforms */ 82 void plat_ea_handler(unsigned int ea_reason, uint64_t syndrome, void *cookie, 83 void *handle, uint64_t flags) 84 { 85 #if RAS_EXTENSION 86 /* Call RAS EA handler */ 87 int handled = ras_ea_handler(ea_reason, syndrome, cookie, handle, flags); 88 if (handled != 0) 89 return; 90 #endif 91 unsigned int level = (unsigned int)GET_EL(read_spsr_el3()); 92 93 ERROR("Unhandled External Abort received on 0x%lx from %s\n", 94 read_mpidr_el1(), get_el_str(level)); 95 ERROR("exception reason=%u syndrome=0x%llx\n", ea_reason, syndrome); 96 #if HANDLE_EA_EL3_FIRST 97 /* Skip backtrace for lower EL */ 98 if (level != MODE_EL3) { 99 console_flush(); 100 do_panic(); 101 } 102 #endif 103 panic(); 104 } 105 106 /******************************************************************************* 107 * In v8.6+ platforms with delayed trapping of WFE this hook sets the delay. It 108 * is a weak function definition so can be overridden depending on the 109 * requirements of a platform. The only hook provided is for the TWED fields 110 * in SCR_EL3, the TWED fields in HCR_EL2, SCTLR_EL2, and SCTLR_EL1 should be 111 * configured as needed in lower exception levels. 112 ******************************************************************************/ 113 114 uint32_t plat_arm_set_twedel_scr_el3(void) 115 { 116 return TWED_DISABLED; 117 } 118