1 /* 2 * Copyright (c) 2013-2018, 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 <arch.h> 11 #include <assert.h> 12 #include <context.h> 13 #include <stdint.h> 14 15 /******************************************************************************* 16 * Forward declarations 17 ******************************************************************************/ 18 struct entry_point_info; 19 20 /******************************************************************************* 21 * Function & variable prototypes 22 ******************************************************************************/ 23 void cm_init(void); 24 void *cm_get_context_by_index(unsigned int cpu_idx, 25 unsigned int security_state); 26 void cm_set_context_by_index(unsigned int cpu_idx, 27 void *context, 28 unsigned int security_state); 29 void *cm_get_context(uint32_t security_state); 30 void cm_set_context(void *context, uint32_t security_state); 31 void cm_init_my_context(const struct entry_point_info *ep); 32 void cm_init_context_by_index(unsigned int cpu_idx, 33 const struct entry_point_info *ep); 34 void cm_setup_context(cpu_context_t *ctx, const entry_point_info_t *ep); 35 void cm_prepare_el3_exit(uint32_t security_state); 36 37 #ifndef AARCH32 38 void cm_el1_sysregs_context_save(uint32_t security_state); 39 void cm_el1_sysregs_context_restore(uint32_t security_state); 40 void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint); 41 void cm_set_elr_spsr_el3(uint32_t security_state, 42 uintptr_t entrypoint, uint32_t spsr); 43 void cm_write_scr_el3_bit(uint32_t security_state, 44 uint32_t bit_pos, 45 uint32_t value); 46 void cm_set_next_eret_context(uint32_t security_state); 47 uint32_t cm_get_scr_el3(uint32_t security_state); 48 49 /* Inline definitions */ 50 51 /******************************************************************************* 52 * This function is used to program the context that's used for exception 53 * return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for 54 * the required security state 55 ******************************************************************************/ 56 static inline void cm_set_next_context(void *context) 57 { 58 #if ENABLE_ASSERTIONS 59 uint64_t sp_mode; 60 61 /* 62 * Check that this function is called with SP_EL0 as the stack 63 * pointer 64 */ 65 __asm__ volatile("mrs %0, SPSel\n" 66 : "=r" (sp_mode)); 67 68 assert(sp_mode == MODE_SP_EL0); 69 #endif /* ENABLE_ASSERTIONS */ 70 71 __asm__ volatile("msr spsel, #1\n" 72 "mov sp, %0\n" 73 "msr spsel, #0\n" 74 : : "r" (context)); 75 } 76 77 #else 78 void *cm_get_next_context(void); 79 void cm_set_next_context(void *context); 80 #endif /* AARCH32 */ 81 82 #endif /* CONTEXT_MGMT_H */ 83