1532ed618SSoby Mathew /* 25dffb46cSSoby Mathew * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved. 3532ed618SSoby Mathew * 4*82cb2c1aSdp-arm * SPDX-License-Identifier: BSD-3-Clause 5532ed618SSoby Mathew */ 6532ed618SSoby Mathew 7532ed618SSoby Mathew #ifndef __CM_H__ 8532ed618SSoby Mathew #define __CM_H__ 9532ed618SSoby Mathew 105dffb46cSSoby Mathew #ifndef AARCH32 11532ed618SSoby Mathew #include <arch.h> 125dffb46cSSoby Mathew #endif 13532ed618SSoby Mathew 14532ed618SSoby Mathew /******************************************************************************* 15532ed618SSoby Mathew * Forward declarations 16532ed618SSoby Mathew ******************************************************************************/ 17532ed618SSoby Mathew struct entry_point_info; 18532ed618SSoby Mathew 19532ed618SSoby Mathew /******************************************************************************* 20532ed618SSoby Mathew * Function & variable prototypes 21532ed618SSoby Mathew ******************************************************************************/ 22532ed618SSoby Mathew void cm_init(void); 23532ed618SSoby Mathew void *cm_get_context_by_index(unsigned int cpu_idx, 24532ed618SSoby Mathew unsigned int security_state); 25532ed618SSoby Mathew void cm_set_context_by_index(unsigned int cpu_idx, 26532ed618SSoby Mathew void *context, 27532ed618SSoby Mathew unsigned int security_state); 28532ed618SSoby Mathew void *cm_get_context(uint32_t security_state); 29532ed618SSoby Mathew void cm_set_context(void *context, uint32_t security_state); 30532ed618SSoby Mathew void cm_init_my_context(const struct entry_point_info *ep); 31532ed618SSoby Mathew void cm_init_context_by_index(unsigned int cpu_idx, 32532ed618SSoby Mathew const struct entry_point_info *ep); 33532ed618SSoby Mathew void cm_prepare_el3_exit(uint32_t security_state); 34e33b78a6SSoby Mathew 35e33b78a6SSoby Mathew #ifndef AARCH32 36532ed618SSoby Mathew void cm_el1_sysregs_context_save(uint32_t security_state); 37532ed618SSoby Mathew void cm_el1_sysregs_context_restore(uint32_t security_state); 38532ed618SSoby Mathew void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint); 39532ed618SSoby Mathew void cm_set_elr_spsr_el3(uint32_t security_state, 40532ed618SSoby Mathew uintptr_t entrypoint, uint32_t spsr); 41532ed618SSoby Mathew void cm_write_scr_el3_bit(uint32_t security_state, 42532ed618SSoby Mathew uint32_t bit_pos, 43532ed618SSoby Mathew uint32_t value); 44532ed618SSoby Mathew void cm_set_next_eret_context(uint32_t security_state); 45532ed618SSoby Mathew uint32_t cm_get_scr_el3(uint32_t security_state); 46532ed618SSoby Mathew 47e33b78a6SSoby Mathew 48e33b78a6SSoby Mathew void cm_init_context(uint64_t mpidr, 49e33b78a6SSoby Mathew const struct entry_point_info *ep) __deprecated; 50e33b78a6SSoby Mathew 51e33b78a6SSoby Mathew void *cm_get_context_by_mpidr(uint64_t mpidr, 52e33b78a6SSoby Mathew uint32_t security_state) __deprecated; 53e33b78a6SSoby Mathew void cm_set_context_by_mpidr(uint64_t mpidr, 54e33b78a6SSoby Mathew void *context, 55e33b78a6SSoby Mathew uint32_t security_state) __deprecated; 56e33b78a6SSoby Mathew 57532ed618SSoby Mathew /* Inline definitions */ 58532ed618SSoby Mathew 59532ed618SSoby Mathew /******************************************************************************* 60532ed618SSoby Mathew * This function is used to program the context that's used for exception 61532ed618SSoby Mathew * return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for 62532ed618SSoby Mathew * the required security state 63532ed618SSoby Mathew ******************************************************************************/ 64532ed618SSoby Mathew static inline void cm_set_next_context(void *context) 65532ed618SSoby Mathew { 66aa61368eSAntonio Nino Diaz #if ENABLE_ASSERTIONS 67532ed618SSoby Mathew uint64_t sp_mode; 68532ed618SSoby Mathew 69532ed618SSoby Mathew /* 70532ed618SSoby Mathew * Check that this function is called with SP_EL0 as the stack 71532ed618SSoby Mathew * pointer 72532ed618SSoby Mathew */ 73532ed618SSoby Mathew __asm__ volatile("mrs %0, SPSel\n" 74532ed618SSoby Mathew : "=r" (sp_mode)); 75532ed618SSoby Mathew 76532ed618SSoby Mathew assert(sp_mode == MODE_SP_EL0); 77aa61368eSAntonio Nino Diaz #endif /* ENABLE_ASSERTIONS */ 78532ed618SSoby Mathew 79532ed618SSoby Mathew __asm__ volatile("msr spsel, #1\n" 80532ed618SSoby Mathew "mov sp, %0\n" 81532ed618SSoby Mathew "msr spsel, #0\n" 82532ed618SSoby Mathew : : "r" (context)); 83532ed618SSoby Mathew } 84f3b4914bSYatharth Kochar 85f3b4914bSYatharth Kochar #else 86f3b4914bSYatharth Kochar void *cm_get_next_context(void); 87e33b78a6SSoby Mathew #endif /* AARCH32 */ 88f3b4914bSYatharth Kochar 89532ed618SSoby Mathew #endif /* __CM_H__ */ 90