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 #include <inttypes.h> 9 #include <stdint.h> 10 11 #include <arch_helpers.h> 12 #include <drivers/console.h> 13 #if RAS_EXTENSION 14 #include <lib/extensions/ras.h> 15 #endif 16 #include <lib/extensions/twed.h> 17 #include <lib/xlat_tables/xlat_mmu_helpers.h> 18 #include <plat/common/platform.h> 19 20 /* 21 * The following platform setup functions are weakly defined. They 22 * provide typical implementations that may be re-used by multiple 23 * platforms but may also be overridden by a platform if required. 24 */ 25 #pragma weak bl31_plat_runtime_setup 26 #pragma weak plat_arm_set_twedel_scr_el3 27 28 #if SDEI_SUPPORT 29 #pragma weak plat_sdei_handle_masked_trigger 30 #pragma weak plat_sdei_validate_entry_point 31 #endif 32 33 #pragma weak plat_ea_handler = plat_default_ea_handler 34 35 void bl31_plat_runtime_setup(void) 36 { 37 console_switch_state(CONSOLE_FLAG_RUNTIME); 38 } 39 40 /* 41 * Helper function for platform_get_pos() when platform compatibility is 42 * disabled. This is to enable SPDs using the older platform API to continue 43 * to work. 44 */ 45 unsigned int platform_core_pos_helper(unsigned long mpidr) 46 { 47 int idx = plat_core_pos_by_mpidr(mpidr); 48 assert(idx >= 0); 49 return idx; 50 } 51 52 #if SDEI_SUPPORT 53 /* 54 * Function that handles spurious SDEI interrupts while events are masked. 55 */ 56 void plat_sdei_handle_masked_trigger(uint64_t mpidr, unsigned int intr) 57 { 58 WARN("Spurious SDEI interrupt %u on masked PE %" PRIx64 "\n", intr, mpidr); 59 } 60 61 /* 62 * Default Function to validate SDEI entry point, which returns success. 63 * Platforms may override this with their own validation mechanism. 64 */ 65 int plat_sdei_validate_entry_point(uintptr_t ep, unsigned int client_mode) 66 { 67 return 0; 68 } 69 #endif 70 71 #if !ENABLE_BACKTRACE 72 static const char *get_el_str(unsigned int el) 73 { 74 if (el == MODE_EL3) { 75 return "EL3"; 76 } else if (el == MODE_EL2) { 77 return "EL2"; 78 } 79 return "S-EL1"; 80 } 81 #endif /* !ENABLE_BACKTRACE */ 82 83 /* RAS functions common to AArch64 ARM platforms */ 84 void plat_default_ea_handler(unsigned int ea_reason, uint64_t syndrome, void *cookie, 85 void *handle, uint64_t flags) 86 { 87 #if RAS_EXTENSION 88 /* Call RAS EA handler */ 89 int handled = ras_ea_handler(ea_reason, syndrome, cookie, handle, flags); 90 if (handled != 0) 91 return; 92 #endif 93 unsigned int level = (unsigned int)GET_EL(read_spsr_el3()); 94 95 ERROR_NL(); 96 ERROR("Unhandled External Abort received on 0x%lx from %s\n", 97 read_mpidr_el1(), get_el_str(level)); 98 ERROR("exception reason=%u syndrome=0x%" PRIx64 "\n", ea_reason, syndrome); 99 #if HANDLE_EA_EL3_FIRST 100 /* Skip backtrace for lower EL */ 101 if (level != MODE_EL3) { 102 console_flush(); 103 do_panic(); 104 } 105 #endif 106 panic(); 107 } 108 109 /******************************************************************************* 110 * In v8.6+ platforms with delayed trapping of WFE this hook sets the delay. It 111 * is a weak function definition so can be overridden depending on the 112 * requirements of a platform. The only hook provided is for the TWED fields 113 * in SCR_EL3, the TWED fields in HCR_EL2, SCTLR_EL2, and SCTLR_EL1 should be 114 * configured as needed in lower exception levels. 115 ******************************************************************************/ 116 117 uint32_t plat_arm_set_twedel_scr_el3(void) 118 { 119 return TWED_DISABLED; 120 } 121