drivers/misc/tzdev/tz_mem.h

/*
 * Copyright (C) 2012-2017, Samsung Electronics Co., Ltd.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef __TZ_MEM_H__
#define __TZ_MEM_H__

#include <linux/mm.h>
#include <linux/pid.h>
#include <asm/page.h>

#include <tz_cred.h>

#define OFFSET_IN_PAGE(x)	((x) & (~PAGE_MASK))
#define NUM_PAGES(size)		(((size) >> PAGE_SHIFT) + !!OFFSET_IN_PAGE(size))

typedef void (*tzdev_mem_free_func_t)(void *);

struct tzdev_mem_reg {
	unsigned int is_user;
	unsigned long nr_pages;
	struct page **pages;
	tzdev_mem_free_func_t free_func;
	void *free_data;
	unsigned int in_release;
	struct tz_cred cred;
};

int tzdev_mem_init(void);
void tzdev_mem_fini(void);
int tzdev_mem_register_user(unsigned long size, unsigned int write);
int tzdev_mem_release_user(unsigned int id);
int tzdev_mem_register(void *ptr, unsigned long size, unsigned int write,
		tzdev_mem_free_func_t free_func, void *free_data);
int tzdev_mem_release(unsigned int id);
int tzdev_mem_find(unsigned int id, struct tzdev_mem_reg **mem);
void tzdev_mem_release_panic_handler(void);
#endif /* __TZ_MEM_H__ */