psci_lib.h

/*
 * Copyright (c) 2017, 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 __PSCI_LIB_H__
#define __PSCI_LIB_H__

#include <ep_info.h>

#ifndef __ASSEMBLY__
#include <types.h>

/*******************************************************************************
 * Optional structure populated by the Secure Payload Dispatcher to be given a
 * chance to perform any bookkeeping before PSCI executes a power management
 * operation. It also allows PSCI to determine certain properties of the SP e.g.
 * migrate capability etc.
 ******************************************************************************/
typedef struct spd_pm_ops {
	void (*svc_on)(u_register_t target_cpu);
	int32_t (*svc_off)(u_register_t __unused);
	void (*svc_suspend)(u_register_t max_off_pwrlvl);
	void (*svc_on_finish)(u_register_t __unused);
	void (*svc_suspend_finish)(u_register_t max_off_pwrlvl);
	int32_t (*svc_migrate)(u_register_t from_cpu, u_register_t to_cpu);
	int32_t (*svc_migrate_info)(u_register_t *resident_cpu);
	void (*svc_system_off)(void);
	void (*svc_system_reset)(void);
} spd_pm_ops_t;

/*
 * Function prototype for the warmboot entrypoint function which will be
 * programmed in the mailbox by the platform.
 */
typedef void (*mailbox_entrypoint_t)(void);

/******************************************************************************
 * Structure to pass PSCI Library arguments.
 *****************************************************************************/
typedef struct psci_lib_args {
	/* The version information of PSCI Library Interface */
	param_header_t		h;
	/* The warm boot entrypoint function */
	mailbox_entrypoint_t	mailbox_ep;
} psci_lib_args_t;

/* Helper macro to set the psci_lib_args_t structure at runtime */
#define SET_PSCI_LIB_ARGS_V1(_p, _entry)	do {			\
	SET_PARAM_HEAD(_p, PARAM_PSCI_LIB_ARGS, VERSION_1, 0);		\
	(_p)->mailbox_ep = (_entry);					\
	} while (0)

/* Helper macro to define the psci_lib_args_t statically */
#define DEFINE_STATIC_PSCI_LIB_ARGS_V1(_name, _entry)		\
	static const psci_lib_args_t (_name) = {		\
		.h.type = (uint8_t)PARAM_PSCI_LIB_ARGS,		\
		.h.version = (uint8_t)VERSION_1,		\
		.h.size = (uint16_t)sizeof(_name),		\
		.h.attr = 0,					\
		.mailbox_ep = (_entry)				\
	}

/* Helper macro to verify the pointer to psci_lib_args_t structure */
#define VERIFY_PSCI_LIB_ARGS_V1(_p)	((_p)			\
		&& ((_p)->h.type == PARAM_PSCI_LIB_ARGS)	\
		&& ((_p)->h.version == VERSION_1)		\
		&& ((_p)->h.size == sizeof(*(_p)))		\
		&& ((_p)->h.attr == 0)				\
		&& ((_p)->mailbox_ep))

/******************************************************************************
 * PSCI Library Interfaces
 *****************************************************************************/
u_register_t psci_smc_handler(uint32_t smc_fid,
			  u_register_t x1,
			  u_register_t x2,
			  u_register_t x3,
			  u_register_t x4,
			  void *cookie,
			  void *handle,
			  u_register_t flags);
int psci_setup(const psci_lib_args_t *lib_args);
void psci_warmboot_entrypoint(void);
void psci_register_spd_pm_hook(const spd_pm_ops_t *pm);
void psci_prepare_next_non_secure_ctx(
			  entry_point_info_t *next_image_info);
#endif /* __ASSEMBLY__ */

#endif /* __PSCI_LIB_H */