1 /* 2 * Copyright (c) 2013-2025, Arm Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #ifndef CONTEXT_MGMT_H 8 #define CONTEXT_MGMT_H 9 10 #include <assert.h> 11 #include <context.h> 12 #include <stdint.h> 13 14 #include <arch.h> 15 16 /******************************************************************************* 17 * Forward declarations 18 ******************************************************************************/ 19 struct entry_point_info; 20 21 /******************************************************************************* 22 * Function & variable prototypes 23 ******************************************************************************/ 24 void cm_init(void); 25 void *cm_get_context_by_index(unsigned int cpu_idx, 26 unsigned int security_state); 27 void cm_set_context_by_index(unsigned int cpu_idx, 28 void *context, 29 unsigned int security_state); 30 void *cm_get_context(uint32_t security_state); 31 void cm_set_context(void *context, uint32_t security_state); 32 void cm_init_my_context(const struct entry_point_info *ep); 33 void cm_setup_context(cpu_context_t *ctx, const struct entry_point_info *ep); 34 void cm_prepare_el3_exit(uint32_t security_state); 35 void cm_prepare_el3_exit_ns(void); 36 37 #ifdef __aarch64__ 38 #if IMAGE_BL31 39 void cm_manage_extensions_el3(unsigned int my_idx); 40 void manage_extensions_nonsecure_per_world(void); 41 void cm_el3_arch_init_per_world(per_world_context_t *per_world_ctx); 42 #endif 43 44 #if (CTX_INCLUDE_EL2_REGS && IMAGE_BL31) 45 void cm_el2_sysregs_context_save(uint32_t security_state); 46 void cm_el2_sysregs_context_restore(uint32_t security_state); 47 #else 48 void cm_el1_sysregs_context_save(uint32_t security_state); 49 void cm_el1_sysregs_context_restore(uint32_t security_state); 50 #endif /* (CTX_INCLUDE_EL2_REGS && IMAGE_BL31) */ 51 52 void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint); 53 void cm_set_elr_spsr_el3(uint32_t security_state, 54 uintptr_t entrypoint, uint32_t spsr); 55 void cm_write_scr_el3_bit(uint32_t security_state, 56 uint32_t bit_pos, 57 uint32_t value); 58 void cm_set_next_eret_context(uint32_t security_state); 59 u_register_t cm_get_scr_el3(uint32_t security_state); 60 61 /* Inline definitions */ 62 63 /******************************************************************************* 64 * This function is used to program the context that's used for exception 65 * return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for 66 * the required security state 67 ******************************************************************************/ 68 static inline void cm_set_next_context(void *context) 69 { 70 #if ENABLE_ASSERTIONS 71 uint64_t sp_mode; 72 73 /* 74 * Check that this function is called with SP_EL0 as the stack 75 * pointer 76 */ 77 __asm__ volatile("mrs %0, SPSel\n" 78 : "=r" (sp_mode)); 79 80 assert(sp_mode == MODE_SP_EL0); 81 #endif /* ENABLE_ASSERTIONS */ 82 83 __asm__ volatile("msr spsel, #1\n" 84 "mov sp, %0\n" 85 "msr spsel, #0\n" 86 : : "r" (context)); 87 } 88 89 #else 90 void *cm_get_next_context(void); 91 void cm_set_next_context(void *context); 92 static inline void cm_manage_extensions_el3(unsigned int cpu_idx) {} 93 static inline void manage_extensions_nonsecure_per_world(void) {} 94 #endif /* __aarch64__ */ 95 96 #endif /* CONTEXT_MGMT_H */ 97