/*
 * Copyright (c) 2013-2016, 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 __BL_COMMON_H__
#define __BL_COMMON_H__

#define SECURE		0x0
#define NON_SECURE	0x1
#define sec_state_is_valid(s) (((s) == SECURE) || ((s) == NON_SECURE))

#define UP	1
#define DOWN	0

/*******************************************************************************
 * Constants to identify the location of a memory region in a given memory
 * layout.
******************************************************************************/
#define TOP	0x1
#define BOTTOM	!TOP

/*******************************************************************************
 * Constants that allow assembler code to access members of and the
 * 'entry_point_info' structure at their correct offsets.
 ******************************************************************************/
#define ENTRY_POINT_INFO_PC_OFFSET	0x08
#define ENTRY_POINT_INFO_ARGS_OFFSET	0x18

/* The following are used to set/get image attributes. */
#define PARAM_EP_SECURITY_MASK		(0x1)

#define GET_SECURITY_STATE(x) (x & PARAM_EP_SECURITY_MASK)
#define SET_SECURITY_STATE(x, security) \
			((x) = ((x) & ~PARAM_EP_SECURITY_MASK) | (security))


/*
 * The following are used for image state attributes.
 * Image can only be in one of the following state.
 */
#define IMAGE_STATE_RESET			0
#define IMAGE_STATE_COPIED			1
#define IMAGE_STATE_COPYING			2
#define IMAGE_STATE_AUTHENTICATED		3
#define IMAGE_STATE_EXECUTED			4
#define IMAGE_STATE_INTERRUPTED			5

#define EP_SECURE	0x0
#define EP_NON_SECURE	0x1

#define EP_EE_MASK	0x2
#define EP_EE_LITTLE	0x0
#define EP_EE_BIG	0x2
#define EP_GET_EE(x) (x & EP_EE_MASK)
#define EP_SET_EE(x, ee) ((x) = ((x) & ~EP_EE_MASK) | (ee))

#define EP_ST_MASK	0x4
#define EP_ST_DISABLE	0x0
#define EP_ST_ENABLE	0x4
#define EP_GET_ST(x) (x & EP_ST_MASK)
#define EP_SET_ST(x, ee) ((x) = ((x) & ~EP_ST_MASK) | (ee))

#define EP_EXE_MASK	0x8
#define NON_EXECUTABLE	0x0
#define EXECUTABLE	0x8
#define EP_GET_EXE(x) (x & EP_EXE_MASK)
#define EP_SET_EXE(x, ee) ((x) = ((x) & ~EP_EXE_MASK) | (ee))

#define PARAM_EP		0x01
#define PARAM_IMAGE_BINARY	0x02
#define PARAM_BL31		0x03

#define VERSION_1	0x01

#define INVALID_IMAGE_ID		(0xFFFFFFFF)

#define SET_PARAM_HEAD(_p, _type, _ver, _attr) do { \
	(_p)->h.type = (uint8_t)(_type); \
	(_p)->h.version = (uint8_t)(_ver); \
	(_p)->h.size = (uint16_t)sizeof(*_p); \
	(_p)->h.attr = (uint32_t)(_attr) ; \
	} while (0)

/* Following is used for populating structure members statically. */
#define SET_STATIC_PARAM_HEAD(_p, _type, _ver, _p_type, _attr)	\
	._p.h.type = (uint8_t)(_type), \
	._p.h.version = (uint8_t)(_ver), \
	._p.h.size = (uint16_t)sizeof(_p_type), \
	._p.h.attr = (uint32_t)(_attr)

#define MODE_RW_SHIFT	0x4
#define MODE_RW_MASK	0x1
#define MODE_RW_64	0x0
#define MODE_RW_32	0x1

#define MODE_EL_SHIFT	0x2
#define MODE_EL_MASK	0x3
#define MODE_EL3	0x3
#define MODE_EL2	0x2
#define MODE_EL1	0x1
#define MODE_EL0	0x0

#define MODE_SP_SHIFT	0x0
#define MODE_SP_MASK	0x1
#define MODE_SP_EL0	0x0
#define MODE_SP_ELX	0x1

#define SPSR_DAIF_SHIFT	6
#define SPSR_DAIF_MASK	0x0f

#define DAIF_FIQ_BIT (1<<0)
#define DAIF_IRQ_BIT (1<<0)
#define DAIF_ABT_BIT (1<<0)
#define DAIF_DBG_BIT (1<<0)
#define DISABLE_ALL_EXECPTIONS	\
	(DAIF_FIQ_BIT | DAIF_IRQ_BIT | DAIF_ABT_BIT | DAIF_DBG_BIT)

#define SPSR_64(el, sp, daif)		\
	(MODE_RW_64 << MODE_RW_SHIFT |	\
	 ((el) & MODE_EL_MASK) << MODE_EL_SHIFT |	\
	 ((sp) & MODE_SP_MASK) << MODE_SP_SHIFT |	\
	 ((daif) & SPSR_DAIF_MASK) << SPSR_DAIF_SHIFT)

/*******************************************************************************
 * Constants to indicate type of exception to the common exception handler.
 ******************************************************************************/
#define SYNC_EXCEPTION_SP_EL0		0x0
#define IRQ_SP_EL0			0x1
#define FIQ_SP_EL0			0x2
#define SERROR_SP_EL0			0x3
#define SYNC_EXCEPTION_SP_ELX		0x4
#define IRQ_SP_ELX			0x5
#define FIQ_SP_ELX			0x6
#define SERROR_SP_ELX			0x7
#define SYNC_EXCEPTION_AARCH64		0x8
#define IRQ_AARCH64			0x9
#define FIQ_AARCH64			0xa
#define SERROR_AARCH64			0xb
#define SYNC_EXCEPTION_AARCH32		0xc
#define IRQ_AARCH32			0xd
#define FIQ_AARCH32			0xe
#define SERROR_AARCH32			0xf

#define SPSR_USE_L           0
#define SPSR_USE_H           1
#define SPSR_L_H_MASK        1
#define SPSR_M_SHIFT         4
#define SPSR_ERET_32         (1 << SPSR_M_SHIFT)
#define SPSR_ERET_64         (0 << SPSR_M_SHIFT)
#define SPSR_FIQ             (1 << 6)
#define SPSR_IRQ             (1 << 7)
#define SPSR_SERROR          (1 << 8)
#define SPSR_DEBUG           (1 << 9)
#define SPSR_EXCEPTION_MASK  (SPSR_FIQ | SPSR_IRQ | SPSR_SERROR | SPSR_DEBUG)

#ifndef __ASSEMBLY__

/*******************************************************************************
 * Structure used for telling the next BL how much of a particular type of
 * memory is available for its use and how much is already used.
 ******************************************************************************/
struct aapcs64_params_t {
	unsigned long arg0;
	unsigned long arg1;
	unsigned long arg2;
	unsigned long arg3;
	unsigned long arg4;
	unsigned long arg5;
	unsigned long arg6;
	unsigned long arg7;
};

/***************************************************************************
 * This structure provides version information and the size of the
 * structure, attributes for the structure it represents
 ***************************************************************************/
struct param_header_t {
	uint8_t type;		/* type of the structure */
	uint8_t version;    /* version of this structure */
	uint16_t size;      /* size of this structure in bytes */
	uint32_t attr;      /* attributes: unused bits SBZ */
};

/*****************************************************************************
 * This structure represents the superset of information needed while
 * switching exception levels. The only two mechanisms to do so are
 * ERET & SMC. Security state is indicated using bit zero of header
 * attribute
 * NOTE: BL1 expects entrypoint followed by spsr at an offset from the start
 * of this structure defined by the macro `ENTRY_POINT_INFO_PC_OFFSET` while
 * processing SMC to jump to BL31.
 *****************************************************************************/
struct entry_point_info_t {
	struct param_header_t h;
	uintptr_t pc;
	uint32_t spsr;
	struct aapcs64_params_t args;
};

/*****************************************************************************
 * Image info binary provides information from the image loader that
 * can be used by the firmware to manage available trusted RAM.
 * More advanced firmware image formats can provide additional
 * information that enables optimization or greater flexibility in the
 * common firmware code
 *****************************************************************************/
struct atf_image_info_t {
	struct param_header_t h;
	uintptr_t image_base;   /* physical address of base of image */
	uint32_t image_size;    /* bytes read from image file */
};

/*****************************************************************************
 * The image descriptor struct definition.
 *****************************************************************************/
struct image_desc_t {
	/* Contains unique image id for the image. */
	unsigned int image_id;
	/*
	 * This member contains Image state information.
	 * Refer IMAGE_STATE_XXX defined above.
	 */
	unsigned int state;
	uint32_t copied_size;	/* image size copied in blocks */
	struct atf_image_info_t atf_image_info;
	struct entry_point_info_t ep_info;
};

/*******************************************************************************
 * This structure represents the superset of information that can be passed to
 * BL31 e.g. while passing control to it from BL2. The BL32 parameters will be
 * populated only if BL2 detects its presence. A pointer to a structure of this
 * type should be passed in X0 to BL31's cold boot entrypoint.
 *
 * Use of this structure and the X0 parameter is not mandatory: the BL31
 * platform code can use other mechanisms to provide the necessary information
 * about BL32 and BL33 to the common and SPD code.
 *
 * BL31 image information is mandatory if this structure is used. If either of
 * the optional BL32 and BL33 image information is not provided, this is
 * indicated by the respective image_info pointers being zero.
 ******************************************************************************/
struct bl31_params_t {
	struct param_header_t h;
	struct atf_image_info_t *bl31_image_info;
	struct entry_point_info_t *bl32_ep_info;
	struct atf_image_info_t *bl32_image_info;
	struct entry_point_info_t *bl33_ep_info;
	struct atf_image_info_t *bl33_image_info;
};

/*******************************************************************************
 * This structure represents the superset of information that is passed to
 * BL31, e.g. while passing control to it from BL2, bl31_params
 * and other platform specific params
 ******************************************************************************/
struct bl2_to_bl31_params_mem_t {
	struct bl31_params_t bl31_params;
	struct atf_image_info_t bl31_image_info;
	struct atf_image_info_t bl32_image_info;
	struct atf_image_info_t bl33_image_info;
	struct entry_point_info_t bl33_ep_info;
	struct entry_point_info_t bl32_ep_info;
	struct entry_point_info_t bl31_ep_info;
};

#endif /*__ASSEMBLY__*/

#endif /* __BL_COMMON_H__ */