/*	$NetBSD: efi.h,v 1.3 2023/05/22 16:27:49 riastradh Exp $	*/

/*-
 * Copyright (c) 2004 Marcel Moolenaar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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	_DEV_EFI_EFI_H_
#define	_DEV_EFI_EFI_H_

/*
 * Machine-independent UEFI protocol definitions.  Based on:
 *
 *	Unified Extensible Firmware Interface (UEFI) Specification,
 *	Version 2.9, UEFI Forum, Inc., March 2021.
 *
 * https://uefi.org/sites/default/files/resources/UEFI_Spec_2_9_2021_03_18.pdf
 */

#if defined(__i386__) || defined(__x86_64__)
#define	EFIAPI	__attribute__((__ms_abi__))
#else
#define	EFIAPI	/* empty */
#endif

#ifdef _LP64
#define	EFIERR(x)		(0x8000000000000000 | (x))
#else
#define	EFIERR(x)		(0x80000000 | (x))
#endif

#define	EFI_SUCCESS		0
#define	EFI_INVALID_PARAMETER	EFIERR(2)
#define	EFI_UNSUPPORTED		EFIERR(3)
#define	EFI_BUFFER_TOO_SMALL	EFIERR(5)
#define	EFI_DEVICE_ERROR	EFIERR(7)
#define	EFI_WRITE_PROTECTED	EFIERR(8)
#define	EFI_OUT_OF_RESOURCES	EFIERR(9)
#define	EFI_NOT_FOUND		EFIERR(14)
#define	EFI_SECURITY_VIOLATION	EFIERR(26)

enum efi_reset {
	EFI_RESET_COLD,
	EFI_RESET_WARM,
	EFI_RESET_SHUTDOWN,
	EFI_RESET_PLATFORM_SPECIFIC,
};

typedef uint16_t	efi_char;
typedef unsigned long efi_status;

struct efi_cfgtbl {
	struct uuid	ct_uuid;
	void		*ct_data;
};

struct efi_md {
	uint32_t	md_type;
#define	EFI_MD_TYPE_NULL	0
#define	EFI_MD_TYPE_CODE	1	/* Loader text. */
#define	EFI_MD_TYPE_DATA	2	/* Loader data. */
#define	EFI_MD_TYPE_BS_CODE	3	/* Boot services text. */
#define	EFI_MD_TYPE_BS_DATA	4	/* Boot services data. */
#define	EFI_MD_TYPE_RT_CODE	5	/* Runtime services text. */
#define	EFI_MD_TYPE_RT_DATA	6	/* Runtime services data. */
#define	EFI_MD_TYPE_FREE	7	/* Unused/free memory. */
#define	EFI_MD_TYPE_BAD		8	/* Bad memory */
#define	EFI_MD_TYPE_RECLAIM	9	/* ACPI reclaimable memory. */
#define	EFI_MD_TYPE_FIRMWARE	10	/* ACPI NV memory */
#define	EFI_MD_TYPE_IOMEM	11	/* Memory-mapped I/O. */
#define	EFI_MD_TYPE_IOPORT	12	/* I/O port space. */
#define	EFI_MD_TYPE_PALCODE	13	/* PAL */
#define	EFI_MD_TYPE_PMEM	14	/* Persistent memory. */
	uint32_t	__pad;
	uint64_t	md_phys;
	uint64_t	md_virt;
	uint64_t	md_pages;
	uint64_t	md_attr;
#define	EFI_MD_ATTR_UC		0x0000000000000001UL
#define	EFI_MD_ATTR_WC		0x0000000000000002UL
#define	EFI_MD_ATTR_WT		0x0000000000000004UL
#define	EFI_MD_ATTR_WB		0x0000000000000008UL
#define	EFI_MD_ATTR_UCE		0x0000000000000010UL
#define	EFI_MD_ATTR_WP		0x0000000000001000UL
#define	EFI_MD_ATTR_RP		0x0000000000002000UL
#define	EFI_MD_ATTR_XP		0x0000000000004000UL
#define	EFI_MD_ATTR_NV		0x0000000000008000UL
#define	EFI_MD_ATTR_MORE_RELIABLE 0x0000000000010000UL
#define	EFI_MD_ATTR_RO		0x0000000000020000UL
#define	EFI_MD_ATTR_SP		0x0000000000040000UL
#define	EFI_MD_ATTR_CPU_CRYPTO	0x0000000000080000UL
#define	EFI_MD_ATTR_RT		0x8000000000000000UL
};

struct efi_tm {
	uint16_t	tm_year;		/* 1998 - 20XX */
	uint8_t		tm_mon;			/* 1 - 12 */
	uint8_t		tm_mday;		/* 1 - 31 */
	uint8_t		tm_hour;		/* 0 - 23 */
	uint8_t		tm_min;			/* 0 - 59 */
	uint8_t		tm_sec;			/* 0 - 59 */
	uint8_t		__pad1;
	uint32_t	tm_nsec;		/* 0 - 999,999,999 */
	int16_t		tm_tz;			/* -1440 to 1440 or 2047 */
	uint8_t		tm_dst;
	uint8_t		__pad2;
};

struct efi_tmcap {
	uint32_t	tc_res;		/* 1e-6 parts per million */
	uint32_t	tc_prec;	/* hertz */
	uint8_t		tc_stz;		/* Set clears sub-second time */
};

struct efi_tblhdr {
	uint64_t	th_sig;
	uint32_t	th_rev;
	uint32_t	th_hdrsz;
	uint32_t	th_crc32;
	uint32_t	__res;
};

struct efi_rt {
	struct efi_tblhdr rt_hdr;
	efi_status	(*rt_gettime)(struct efi_tm *, struct efi_tmcap *)
			    EFIAPI;
	efi_status	(*rt_settime)(struct efi_tm *) EFIAPI;
	efi_status	(*rt_getwaketime)(uint8_t *, uint8_t *,
			    struct efi_tm *) EFIAPI;
	efi_status	(*rt_setwaketime)(uint8_t, struct efi_tm *) EFIAPI;
	efi_status	(*rt_setvirtual)(u_long, u_long, uint32_t,
			    struct efi_md *) EFIAPI;
	efi_status	(*rt_cvtptr)(u_long, void **) EFIAPI;
	efi_status	(*rt_getvar)(efi_char *, struct uuid *, uint32_t *,
			    u_long *, void *) EFIAPI;
	efi_status	(*rt_scanvar)(u_long *, efi_char *, struct uuid *)
			    EFIAPI;
	efi_status	(*rt_setvar)(efi_char *, struct uuid *, uint32_t,
			    u_long, void *) EFIAPI;
	efi_status	(*rt_gethicnt)(uint32_t *) EFIAPI;
	efi_status	(*rt_reset)(enum efi_reset, efi_status, u_long,
			    efi_char *) EFIAPI;
};

struct efi_systbl {
	struct efi_tblhdr st_hdr;
#define	EFI_SYSTBL_SIG	0x5453595320494249UL
	efi_char	*st_fwvendor;
	uint32_t	st_fwrev;
#ifdef _LP64
	uint32_t	__pad;
#endif
	void		*st_cin;
	void		*st_cinif;
	void		*st_cout;
	void		*st_coutif;
	void		*st_cerr;
	void		*st_cerrif;
	struct efi_rt	*st_rt;
	void		*st_bs;
	u_long		st_entries;
	struct efi_cfgtbl *st_cfgtbl;
};
#ifdef _LP64
__CTASSERT(sizeof(struct efi_systbl) == 120);
#else
__CTASSERT(sizeof(struct efi_systbl) == 72);
#endif

#endif	/* _DEV_EFI_EFI_H_ */