1 /* 2 * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #ifndef __CM_H__ 8 #define __CM_H__ 9 10 #ifndef AARCH32 11 #include <arch.h> 12 #include <assert.h> 13 #include <stdint.h> 14 #endif 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_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 50 void cm_init_context(uint64_t mpidr, 51 const struct entry_point_info *ep) __deprecated; 52 53 void *cm_get_context_by_mpidr(uint64_t mpidr, 54 uint32_t security_state) __deprecated; 55 void cm_set_context_by_mpidr(uint64_t mpidr, 56 void *context, 57 uint32_t security_state) __deprecated; 58 59 /* Inline definitions */ 60 61 /******************************************************************************* 62 * This function is used to program the context that's used for exception 63 * return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for 64 * the required security state 65 ******************************************************************************/ 66 static inline void cm_set_next_context(void *context) 67 { 68 #if ENABLE_ASSERTIONS 69 uint64_t sp_mode; 70 71 /* 72 * Check that this function is called with SP_EL0 as the stack 73 * pointer 74 */ 75 __asm__ volatile("mrs %0, SPSel\n" 76 : "=r" (sp_mode)); 77 78 assert(sp_mode == MODE_SP_EL0); 79 #endif /* ENABLE_ASSERTIONS */ 80 81 __asm__ volatile("msr spsel, #1\n" 82 "mov sp, %0\n" 83 "msr spsel, #0\n" 84 : : "r" (context)); 85 } 86 87 #else 88 void *cm_get_next_context(void); 89 void cm_set_next_context(void *context); 90 #endif /* AARCH32 */ 91 92 #endif /* __CM_H__ */ 93