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 <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 #ifndef AARCH32 39 void cm_el1_sysregs_context_save(uint32_t security_state); 40 void cm_el1_sysregs_context_restore(uint32_t security_state); 41 void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint); 42 void cm_set_elr_spsr_el3(uint32_t security_state, 43 uintptr_t entrypoint, uint32_t spsr); 44 void cm_write_scr_el3_bit(uint32_t security_state, 45 uint32_t bit_pos, 46 uint32_t value); 47 void cm_set_next_eret_context(uint32_t security_state); 48 uint32_t cm_get_scr_el3(uint32_t security_state); 49 50 /* Inline definitions */ 51 52 /******************************************************************************* 53 * This function is used to program the context that's used for exception 54 * return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for 55 * the required security state 56 ******************************************************************************/ 57 static inline void cm_set_next_context(void *context) 58 { 59 #if ENABLE_ASSERTIONS 60 uint64_t sp_mode; 61 62 /* 63 * Check that this function is called with SP_EL0 as the stack 64 * pointer 65 */ 66 __asm__ volatile("mrs %0, SPSel\n" 67 : "=r" (sp_mode)); 68 69 assert(sp_mode == MODE_SP_EL0); 70 #endif /* ENABLE_ASSERTIONS */ 71 72 __asm__ volatile("msr spsel, #1\n" 73 "mov sp, %0\n" 74 "msr spsel, #0\n" 75 : : "r" (context)); 76 } 77 78 #else 79 void *cm_get_next_context(void); 80 void cm_set_next_context(void *context); 81 #endif /* AARCH32 */ 82 83 #endif /* CONTEXT_MGMT_H */ 84