/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Extensible Firmware Interface
 * Based on 'Extensible Firmware Interface Specification' version 0.9,
 * April 30, 1999
 *
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 * Copyright (C) 1999, 2002-2003 Hewlett-Packard Co.
 *      David Mosberger-Tang <davidm@hpl.hp.com>
 *      Stephane Eranian <eranian@hpl.hp.com>
 *
 * From include/linux/efi.h in kernel 4.1 with some additions/subtractions
 */

#ifndef _EFI_H
#define _EFI_H

#include <linux/linkage.h>
#include <linux/string.h>
#include <linux/types.h>

/* Type INTN in UEFI specification */
#define efi_intn_t ssize_t
/* Type UINTN in UEFI specification*/
#define efi_uintn_t size_t

/*
 * EFI on x86_64 uses the Microsoft ABI which is not the default for GCC.
 *
 * There are two scenarios for EFI on x86_64: building a 64-bit EFI stub
 * codes (CONFIG_EFI_STUB_64BIT) and building a 64-bit U-Boot (CONFIG_X86_64).
 * Either needs to be properly built with the '-m64' compiler flag, and hence
 * it is enough to only check the compiler provided define __x86_64__ here.
 */
#ifdef __x86_64__
#define EFIAPI __attribute__((ms_abi))
#define efi_va_list __builtin_ms_va_list
#define efi_va_start __builtin_ms_va_start
#define efi_va_arg __builtin_va_arg
#define efi_va_end __builtin_ms_va_end
#else
#define EFIAPI asmlinkage
#define efi_va_list va_list
#define efi_va_start va_start
#define efi_va_arg va_arg
#define efi_va_end va_end
#endif /* __x86_64__ */

#define EFI32_LOADER_SIGNATURE  "EL32"
#define EFI64_LOADER_SIGNATURE  "EL64"

struct efi_device_path;

typedef struct {
        u8 b[16];
} efi_guid_t __attribute__((aligned(8)));

#define EFI_BITS_PER_LONG       (sizeof(long) * 8)

/* Bit mask for EFI status code with error */
#define EFI_ERROR_MASK (1UL << (EFI_BITS_PER_LONG - 1))
/* Status codes returned by EFI protocols */
#define EFI_SUCCESS                     0
#define EFI_LOAD_ERROR                  (EFI_ERROR_MASK | 1)
#define EFI_INVALID_PARAMETER           (EFI_ERROR_MASK | 2)
#define EFI_UNSUPPORTED                 (EFI_ERROR_MASK | 3)
#define EFI_BAD_BUFFER_SIZE             (EFI_ERROR_MASK | 4)
#define EFI_BUFFER_TOO_SMALL            (EFI_ERROR_MASK | 5)
#define EFI_NOT_READY                   (EFI_ERROR_MASK | 6)
#define EFI_DEVICE_ERROR                (EFI_ERROR_MASK | 7)
#define EFI_WRITE_PROTECTED             (EFI_ERROR_MASK | 8)
#define EFI_OUT_OF_RESOURCES            (EFI_ERROR_MASK | 9)
#define EFI_VOLUME_CORRUPTED            (EFI_ERROR_MASK | 10)
#define EFI_VOLUME_FULL                 (EFI_ERROR_MASK | 11)
#define EFI_NO_MEDIA                    (EFI_ERROR_MASK | 12)
#define EFI_MEDIA_CHANGED               (EFI_ERROR_MASK | 13)
#define EFI_NOT_FOUND                   (EFI_ERROR_MASK | 14)
#define EFI_ACCESS_DENIED               (EFI_ERROR_MASK | 15)
#define EFI_NO_RESPONSE                 (EFI_ERROR_MASK | 16)
#define EFI_NO_MAPPING                  (EFI_ERROR_MASK | 17)
#define EFI_TIMEOUT                     (EFI_ERROR_MASK | 18)
#define EFI_NOT_STARTED                 (EFI_ERROR_MASK | 19)
#define EFI_ALREADY_STARTED             (EFI_ERROR_MASK | 20)
#define EFI_ABORTED                     (EFI_ERROR_MASK | 21)
#define EFI_ICMP_ERROR                  (EFI_ERROR_MASK | 22)
#define EFI_TFTP_ERROR                  (EFI_ERROR_MASK | 23)
#define EFI_PROTOCOL_ERROR              (EFI_ERROR_MASK | 24)
#define EFI_INCOMPATIBLE_VERSION        (EFI_ERROR_MASK | 25)
#define EFI_SECURITY_VIOLATION          (EFI_ERROR_MASK | 26)
#define EFI_CRC_ERROR                   (EFI_ERROR_MASK | 27)
#define EFI_END_OF_MEDIA                (EFI_ERROR_MASK | 28)
#define EFI_END_OF_FILE                 (EFI_ERROR_MASK | 31)
#define EFI_INVALID_LANGUAGE            (EFI_ERROR_MASK | 32)
#define EFI_COMPROMISED_DATA            (EFI_ERROR_MASK | 33)
#define EFI_IP_ADDRESS_CONFLICT         (EFI_ERROR_MASK | 34)
#define EFI_HTTP_ERROR                  (EFI_ERROR_MASK | 35)

#define EFI_WARN_UNKNOWN_GLYPH          1
#define EFI_WARN_DELETE_FAILURE         2
#define EFI_WARN_WRITE_FAILURE          3
#define EFI_WARN_BUFFER_TOO_SMALL       4
#define EFI_WARN_STALE_DATA             5
#define EFI_WARN_FILE_SYSTEM            6
#define EFI_WARN_RESET_REQUIRED         7

typedef unsigned long efi_status_t;
typedef u64 efi_physical_addr_t;
typedef u64 efi_virtual_addr_t;
typedef struct efi_object *efi_handle_t;

#define EFI_GUID(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
        {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, \
                ((a) >> 24) & 0xff, \
                (b) & 0xff, ((b) >> 8) & 0xff, \
                (c) & 0xff, ((c) >> 8) & 0xff, \
                (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) } }

/* Generic EFI table header */
struct efi_table_hdr {
        u64 signature;
        u32 revision;
        u32 headersize;
        u32 crc32;
        u32 reserved;
};

/* Enumeration of memory types introduced in UEFI */
enum efi_mem_type {
        EFI_RESERVED_MEMORY_TYPE,
        /*
         * The code portions of a loaded application.
         * (Note that UEFI OS loaders are UEFI applications.)
         */
        EFI_LOADER_CODE,
        /*
         * The data portions of a loaded application and
         * the default data allocation type used by an application
         * to allocate pool memory.
         */
        EFI_LOADER_DATA,
        /* The code portions of a loaded Boot Services Driver */
        EFI_BOOT_SERVICES_CODE,
        /*
         * The data portions of a loaded Boot Services Driver and
         * the default data allocation type used by a Boot Services
         * Driver to allocate pool memory.
         */
        EFI_BOOT_SERVICES_DATA,
        /* The code portions of a loaded Runtime Services Driver */
        EFI_RUNTIME_SERVICES_CODE,
        /*
         * The data portions of a loaded Runtime Services Driver and
         * the default data allocation type used by a Runtime Services
         * Driver to allocate pool memory.
         */
        EFI_RUNTIME_SERVICES_DATA,
        /* Free (unallocated) memory */
        EFI_CONVENTIONAL_MEMORY,
        /* Memory in which errors have been detected */
        EFI_UNUSABLE_MEMORY,
        /* Memory that holds the ACPI tables */
        EFI_ACPI_RECLAIM_MEMORY,
        /* Address space reserved for use by the firmware */
        EFI_ACPI_MEMORY_NVS,
        /*
         * Used by system firmware to request that a memory-mapped IO region
         * be mapped by the OS to a virtual address so it can be accessed by
         * EFI runtime services.
         */
        EFI_MMAP_IO,
        /*
         * System memory-mapped IO region that is used to translate
         * memory cycles to IO cycles by the processor.
         */
        EFI_MMAP_IO_PORT,
        /*
         * Address space reserved by the firmware for code that is
         * part of the processor.
         */
        EFI_PAL_CODE,
        /*
         * Byte addressable non-volatile memory.
         */
        EFI_PERSISTENT_MEMORY_TYPE,
        /*
         * Unaccepted memory must be accepted by boot target before usage.
         */
        EFI_UNACCEPTED_MEMORY_TYPE,

        EFI_MAX_MEMORY_TYPE,
};

/* Attribute values */
#define EFI_MEMORY_UC           ((u64)0x0000000000000001ULL)    /* uncached */
#define EFI_MEMORY_WC           ((u64)0x0000000000000002ULL)    /* write-coalescing */
#define EFI_MEMORY_WT           ((u64)0x0000000000000004ULL)    /* write-through */
#define EFI_MEMORY_WB           ((u64)0x0000000000000008ULL)    /* write-back */
#define EFI_MEMORY_UCE          ((u64)0x0000000000000010ULL)    /* uncached, exported */
#define EFI_MEMORY_WP           ((u64)0x0000000000001000ULL)    /* write-protect */
#define EFI_MEMORY_RP           ((u64)0x0000000000002000ULL)    /* read-protect */
#define EFI_MEMORY_XP           ((u64)0x0000000000004000ULL)    /* execute-protect */
#define EFI_MEMORY_NV           ((u64)0x0000000000008000ULL)    /* non-volatile */
#define EFI_MEMORY_MORE_RELIABLE \
                                ((u64)0x0000000000010000ULL)    /* higher reliability */
#define EFI_MEMORY_RO           ((u64)0x0000000000020000ULL)    /* read-only */
#define EFI_MEMORY_SP           ((u64)0x0000000000040000ULL)    /* specific-purpose memory (SPM) */
#define EFI_MEMORY_CPU_CRYPTO   ((u64)0x0000000000080000ULL)    /* cryptographically protectable */
#define EFI_MEMORY_RUNTIME      ((u64)0x8000000000000000ULL)    /* range requires runtime mapping */
#define EFI_MEM_DESC_VERSION    1

#define EFI_PAGE_SHIFT          12
#define EFI_PAGE_SIZE           (1ULL << EFI_PAGE_SHIFT)
#define EFI_PAGE_MASK           (EFI_PAGE_SIZE - 1)

struct efi_mem_desc {
        u32 type;
        u32 reserved;
        efi_physical_addr_t physical_start;
        efi_virtual_addr_t virtual_start;
        u64 num_pages;
        u64 attribute;
};

#define EFI_MEMORY_DESCRIPTOR_VERSION 1

/* Allocation types for calls to boottime->allocate_pages*/
#define EFI_ALLOCATE_ANY_PAGES          0
#define EFI_ALLOCATE_MAX_ADDRESS        1
#define EFI_ALLOCATE_ADDRESS            2
#define EFI_MAX_ALLOCATE_TYPE           3

/* Types and defines for Time Services */
#define EFI_TIME_ADJUST_DAYLIGHT 0x1
#define EFI_TIME_IN_DAYLIGHT     0x2
#define EFI_UNSPECIFIED_TIMEZONE 0x07ff

struct efi_time {
        u16 year;
        u8 month;
        u8 day;
        u8 hour;
        u8 minute;
        u8 second;
        u8 pad1;
        u32 nanosecond;
        s16 timezone;
        u8 daylight;
        u8 pad2;
};

struct efi_time_cap {
        u32 resolution;
        u32 accuracy;
        u8 sets_to_zero;
};

enum efi_locate_search_type {
        ALL_HANDLES,
        BY_REGISTER_NOTIFY,
        BY_PROTOCOL
};

struct efi_open_protocol_info_entry {
        efi_handle_t agent_handle;
        efi_handle_t controller_handle;
        u32 attributes;
        u32 open_count;
};

enum efi_entry_t {
        EFIET_END,      /* Signals this is the last (empty) entry */
        EFIET_MEMORY_MAP,
        EFIET_GOP_MODE,
        EFIET_SYS_TABLE,

        /* Number of entries */
        EFIET_MEMORY_COUNT,
};

#define EFI_TABLE_VERSION       1

/**
 * struct efi_info_hdr - Header for the EFI info table
 *
 * @version:    EFI_TABLE_VERSION
 * @hdr_size:   Size of this struct in bytes
 * @total_size: Total size of this header plus following data
 * @spare:      Spare space for expansion
 */
struct efi_info_hdr {
        u32 version;
        u32 hdr_size;
        u32 total_size;
        u32 spare[5];
};

/**
 * struct efi_entry_hdr - Header for a table entry
 *
 * @type:       enum eft_entry_t
 * @size        size of entry bytes excluding header and padding
 * @addr:       address of this entry (0 if it follows the header )
 * @link:       size of entry including header and padding
 * @spare1:     Spare space for expansion
 * @spare2:     Spare space for expansion
 */
struct efi_entry_hdr {
        u32 type;
        u32 size;
        u64 addr;
        u32 link;
        u32 spare1;
        u64 spare2;
};

/**
 * struct efi_entry_memmap - a memory map table passed to U-Boot
 *
 * @version:    EFI's memory map table version
 * @desc_size:  EFI's size of each memory descriptor
 * @spare:      Spare space for expansion
 * @desc:       An array of descriptors, each @desc_size bytes apart
 */
struct efi_entry_memmap {
        u32 version;
        u32 desc_size;
        u64 spare;
        struct efi_mem_desc desc[];
};

/**
 * struct efi_entry_gopmode - a GOP mode table passed to U-Boot
 *
 * @fb_base:    EFI's framebuffer base address
 * @fb_size:    EFI's framebuffer size
 * @info_size:  GOP mode info structure size
 * @info:       Start address of the GOP mode info structure
 */
struct efi_entry_gopmode {
        efi_physical_addr_t fb_base;
        /*
         * Not like the ones in 'struct efi_gop_mode' which are 'unsigned
         * long', @fb_size and @info_size have to be 'u64' here. As the EFI
         * stub codes may have different bit size from the U-Boot payload,
         * using 'long' will cause mismatch between the producer (stub) and
         * the consumer (payload).
         */
        u64 fb_size;
        u64 info_size;
        /*
         * We cannot directly use 'struct efi_gop_mode_info info[]' here as
         * it causes compiler to complain: array type has incomplete element
         * type 'struct efi_gop_mode_info'.
         */
        struct /* efi_gop_mode_info */ {
                u32 version;
                u32 width;
                u32 height;
                u32 pixel_format;
                u32 pixel_bitmask[4];
                u32 pixels_per_scanline;
        } info[];
};

/**
 * struct efi_entry_systable - system table passed to U-Boot
 *
 * @sys_table:  EFI system table address
 */
struct efi_entry_systable {
        efi_physical_addr_t sys_table;
};

static inline struct efi_mem_desc *efi_get_next_mem_desc(
                struct efi_entry_memmap *map, struct efi_mem_desc *desc)
{
        return (struct efi_mem_desc *)((ulong)desc + map->desc_size);
}

struct efi_priv {
        efi_handle_t parent_image;
        struct efi_device_path *device_path;
        struct efi_system_table *sys_table;
        struct efi_boot_services *boot;
        struct efi_runtime_services *run;
        bool use_pool_for_malloc;
        unsigned long ram_base;
        unsigned int image_data_type;
        struct efi_info_hdr *info;
        unsigned int info_size;
        void *next_hdr;
};

/* Base address of the EFI image */
extern char image_base[];

/* Start and end of U-Boot image (for payload) */
extern char _binary_u_boot_bin_start[], _binary_u_boot_bin_end[];

/*
 * Variable Attributes
 */
#define EFI_VARIABLE_NON_VOLATILE       0x0000000000000001
#define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x0000000000000002
#define EFI_VARIABLE_RUNTIME_ACCESS     0x0000000000000004
#define EFI_VARIABLE_HARDWARE_ERROR_RECORD 0x0000000000000008
#define EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS 0x0000000000000010
#define EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS 0x0000000000000020
#define EFI_VARIABLE_APPEND_WRITE       0x0000000000000040

#define EFI_VARIABLE_MASK       (EFI_VARIABLE_NON_VOLATILE | \
                                EFI_VARIABLE_BOOTSERVICE_ACCESS | \
                                EFI_VARIABLE_RUNTIME_ACCESS | \
                                EFI_VARIABLE_HARDWARE_ERROR_RECORD | \
                                EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS | \
                                EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS | \
                                EFI_VARIABLE_APPEND_WRITE)

/**
 * efi_get_sys_table() - Get access to the main EFI system table
 *
 * @return pointer to EFI system table
 */

struct efi_system_table *efi_get_sys_table(void);

/**
 * efi_get_ram_base() - Find the base of RAM
 *
 * This is used when U-Boot is built as an EFI application.
 *
 * @return the base of RAM as known to U-Boot
 */
unsigned long efi_get_ram_base(void);

/**
 * efi_init() - Set up ready for use of EFI boot services
 *
 * @priv:       Pointer to our private EFI structure to fill in
 * @banner:     Banner to display when starting
 * @image:      The image handle passed to efi_main()
 * @sys_table:  The EFI system table pointer passed to efi_main()
 */
int efi_init(struct efi_priv *priv, const char *banner, efi_handle_t image,
             struct efi_system_table *sys_table);

/**
 * efi_malloc() - Allocate some memory from EFI
 *
 * @priv:       Pointer to private EFI structure
 * @size:       Number of bytes to allocate
 * @retp:       Return EFI status result
 * @return pointer to memory allocated, or NULL on error
 */
void *efi_malloc(struct efi_priv *priv, int size, efi_status_t *retp);

/**
 * efi_free() - Free memory allocated from EFI
 *
 * @priv:       Pointer to private EFI structure
 * @ptr:        Pointer to memory to free
 */
void efi_free(struct efi_priv *priv, void *ptr);

/**
 * efi_puts() - Write out a string to the EFI console
 *
 * @priv:       Pointer to private EFI structure
 * @str:        String to write (note this is a ASCII, not unicode)
 */
void efi_puts(struct efi_priv *priv, const char *str);

/**
 * efi_putc() - Write out a character to the EFI console
 *
 * @priv:       Pointer to private EFI structure
 * @ch:         Character to write (note this is not unicode)
 */
void efi_putc(struct efi_priv *priv, const char ch);

/**
 * efi_info_get() - get an entry from an EFI table
 *
 * @type:       Entry type to search for
 * @datap:      Returns pointer to entry data
 * @sizep:      Returns pointer to entry size
 * @return 0 if OK, -ENODATA if there is no table, -ENOENT if there is no entry
 * of the requested type, -EPROTONOSUPPORT if the table has the wrong version
 */
int efi_info_get(enum efi_entry_t type, void **datap, int *sizep);

#endif /* _LINUX_EFI_H */