1 /* 2 * Copyright (c) 2013-2023, 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_init_context_by_index(unsigned int cpu_idx, 34 const struct entry_point_info *ep); 35 void cm_setup_context(cpu_context_t *ctx, const struct entry_point_info *ep); 36 void cm_prepare_el3_exit(uint32_t security_state); 37 void cm_prepare_el3_exit_ns(void); 38 39 #ifdef __aarch64__ 40 #if IMAGE_BL31 41 void cm_manage_extensions_el3(void); 42 void manage_extensions_nonsecure_per_world(void); 43 void cm_el3_arch_init_per_world(per_world_context_t *per_world_ctx); 44 #endif 45 46 #if CTX_INCLUDE_EL2_REGS 47 void cm_el2_sysregs_context_save(uint32_t security_state); 48 void cm_el2_sysregs_context_restore(uint32_t security_state); 49 #endif 50 51 void cm_el1_sysregs_context_save(uint32_t security_state); 52 void cm_el1_sysregs_context_restore(uint32_t security_state); 53 void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint); 54 void cm_set_elr_spsr_el3(uint32_t security_state, 55 uintptr_t entrypoint, uint32_t spsr); 56 void cm_write_scr_el3_bit(uint32_t security_state, 57 uint32_t bit_pos, 58 uint32_t value); 59 void cm_set_next_eret_context(uint32_t security_state); 60 u_register_t cm_get_scr_el3(uint32_t security_state); 61 62 /* Inline definitions */ 63 64 /******************************************************************************* 65 * This function is used to program the context that's used for exception 66 * return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for 67 * the required security state 68 ******************************************************************************/ 69 static inline void cm_set_next_context(void *context) 70 { 71 #if ENABLE_ASSERTIONS 72 uint64_t sp_mode; 73 74 /* 75 * Check that this function is called with SP_EL0 as the stack 76 * pointer 77 */ 78 __asm__ volatile("mrs %0, SPSel\n" 79 : "=r" (sp_mode)); 80 81 assert(sp_mode == MODE_SP_EL0); 82 #endif /* ENABLE_ASSERTIONS */ 83 84 __asm__ volatile("msr spsel, #1\n" 85 "mov sp, %0\n" 86 "msr spsel, #0\n" 87 : : "r" (context)); 88 } 89 90 #else 91 void *cm_get_next_context(void); 92 void cm_set_next_context(void *context); 93 static inline void cm_manage_extensions_el3(void) {} 94 static inline void manage_extensions_nonsecure_per_world(void) {} 95 #endif /* __aarch64__ */ 96 97 #endif /* CONTEXT_MGMT_H */ 98