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/*
* Copyright (c) 2013-2022, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef CONTEXT_MGMT_H
#define CONTEXT_MGMT_H
#include <assert.h>
#include <context.h>
#include <stdint.h>
#include <arch.h>
/*******************************************************************************
* Forward declarations
******************************************************************************/
struct entry_point_info;
/*******************************************************************************
* Function & variable prototypes
******************************************************************************/
void cm_init(void);
void *cm_get_context_by_index(unsigned int cpu_idx,
unsigned int security_state);
void cm_set_context_by_index(unsigned int cpu_idx,
void *context,
unsigned int security_state);
void *cm_get_context(uint32_t security_state);
void cm_set_context(void *context, uint32_t security_state);
void cm_init_my_context(const struct entry_point_info *ep);
void cm_init_context_by_index(unsigned int cpu_idx,
const struct entry_point_info *ep);
void cm_setup_context(cpu_context_t *ctx, const struct entry_point_info *ep);
void cm_prepare_el3_exit(uint32_t security_state);
void cm_prepare_el3_exit_ns(void);
#ifdef __aarch64__
#if CTX_INCLUDE_EL2_REGS
void cm_el2_sysregs_context_save(uint32_t security_state);
void cm_el2_sysregs_context_restore(uint32_t security_state);
#endif
void cm_el1_sysregs_context_save(uint32_t security_state);
void cm_el1_sysregs_context_restore(uint32_t security_state);
void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint);
void cm_set_elr_spsr_el3(uint32_t security_state,
uintptr_t entrypoint, uint32_t spsr);
void cm_write_scr_el3_bit(uint32_t security_state,
uint32_t bit_pos,
uint32_t value);
void cm_set_next_eret_context(uint32_t security_state);
u_register_t cm_get_scr_el3(uint32_t security_state);
/* Inline definitions */
/*******************************************************************************
* This function is used to program the context that's used for exception
* return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for
* the required security state
******************************************************************************/
static inline void cm_set_next_context(void *context)
{
#if ENABLE_ASSERTIONS
uint64_t sp_mode;
/*
* Check that this function is called with SP_EL0 as the stack
* pointer
*/
__asm__ volatile("mrs %0, SPSel\n"
: "=r" (sp_mode));
assert(sp_mode == MODE_SP_EL0);
#endif /* ENABLE_ASSERTIONS */
__asm__ volatile("msr spsel, #1\n"
"mov sp, %0\n"
"msr spsel, #0\n"
: : "r" (context));
}
#else
void *cm_get_next_context(void);
void cm_set_next_context(void *context);
#endif /* __aarch64__ */
#endif /* CONTEXT_MGMT_H */
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