• Achin Gupta's avatar
    Add context library API to change a bit in SCR_EL3 · e33981f5
    Achin Gupta authored
    This patch adds an API to write to any bit in the SCR_EL3 member of
    the 'cpu_context' structure of the current CPU for a specified
    security state. This API will be used in subsequent patches which
    introduce interrupt management in EL3 to specify the interrupt routing
    model when execution is not in EL3.
    
    It also renames the cm_set_el3_elr() function to cm_set_elr_el3()
    which is more in line with the system register name being targeted by
    the API.
    
    Change-Id: I310fa7d8f827ad3f350325eca2fb28cb350a85ed
    e33981f5
context_mgmt.h 2.78 KB
/*
 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __CM_H__
#define __CM_H__

#include <stdint.h>

/*******************************************************************************
 * Function & variable prototypes
 ******************************************************************************/
extern void cm_init(void);
extern void *cm_get_context(uint64_t mpidr, uint32_t security_state);
extern void cm_set_context(uint64_t mpidr,
			   void *context,
			   uint32_t security_state);
extern void cm_el3_sysregs_context_save(uint32_t security_state);
extern void cm_el3_sysregs_context_restore(uint32_t security_state);
extern void cm_el1_sysregs_context_save(uint32_t security_state);
extern void cm_el1_sysregs_context_restore(uint32_t security_state);
extern void cm_set_el3_eret_context(uint32_t security_state, uint64_t entrypoint,
		uint32_t spsr, uint32_t scr);
extern void cm_set_elr_el3(uint32_t security_state, uint64_t entrypoint);
extern void cm_write_scr_el3_bit(uint32_t security_state,
				 uint32_t bit_pos,
				 uint32_t value);
extern void cm_set_next_eret_context(uint32_t security_state);
extern void cm_init_pcpu_ptr_cache();
extern void cm_set_pcpu_ptr_cache(const void *pcpu_ptr);
extern void *cm_get_pcpu_ptr_cache(void);
extern uint32_t cm_get_scr_el3(uint32_t security_state);
#endif /* __CM_H__ */