1 /* 2 * Copyright (c) 2013-2020, 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 entry_point_info_t *ep); 36 void cm_prepare_el3_exit(uint32_t security_state); 37 38 #ifdef __aarch64__ 39 #if CTX_INCLUDE_EL2_REGS 40 void cm_el2_sysregs_context_save(uint32_t security_state); 41 void cm_el2_sysregs_context_restore(uint32_t security_state); 42 #endif 43 44 void cm_el1_sysregs_context_save(uint32_t security_state); 45 void cm_el1_sysregs_context_restore(uint32_t security_state); 46 void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint); 47 void cm_set_elr_spsr_el3(uint32_t security_state, 48 uintptr_t entrypoint, uint32_t spsr); 49 void cm_write_scr_el3_bit(uint32_t security_state, 50 uint32_t bit_pos, 51 uint32_t value); 52 void cm_set_next_eret_context(uint32_t security_state); 53 u_register_t cm_get_scr_el3(uint32_t security_state); 54 55 /* Inline definitions */ 56 57 /******************************************************************************* 58 * This function is used to program the context that's used for exception 59 * return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for 60 * the required security state 61 ******************************************************************************/ 62 static inline void cm_set_next_context(void *context) 63 { 64 #if ENABLE_ASSERTIONS 65 uint64_t sp_mode; 66 67 /* 68 * Check that this function is called with SP_EL0 as the stack 69 * pointer 70 */ 71 __asm__ volatile("mrs %0, SPSel\n" 72 : "=r" (sp_mode)); 73 74 assert(sp_mode == MODE_SP_EL0); 75 #endif /* ENABLE_ASSERTIONS */ 76 77 __asm__ volatile("msr spsel, #1\n" 78 "mov sp, %0\n" 79 "msr spsel, #0\n" 80 : : "r" (context)); 81 } 82 83 #else 84 void *cm_get_next_context(void); 85 void cm_set_next_context(void *context); 86 #endif /* __aarch64__ */ 87 88 #endif /* CONTEXT_MGMT_H */ 89