// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

#include <stddef.h>
#include <stdint.h>

// EFI on x86 uses the Microsoft ABI which is not the default for gcc
#if defined(__x86_64__) || defined(__x86__)
#define EFIAPI __attribute__((ms_abi))
#else
#define EFIAPI
#endif

#if UINTPTR_MAX == 0xffffffff
#define EFI_ERROR_MASK 0x80000000
#elif UINTPTR_MAX == 0xffffffffffffffff
#define EFI_ERROR_MASK 0x8000000000000000
#endif

#define EFI_ERR(x) (EFI_ERROR_MASK | x)
#define EFI_ERROR(x) (((ssize_t)x) < 0)

#define EFI_SUCCESS              0
#define EFI_LOAD_ERROR           EFI_ERR(1)
#define EFI_INVALID_PARAMETER    EFI_ERR(2)
#define EFI_UNSUPPORTED          EFI_ERR(3)
#define EFI_BAD_BUFFER_SIZE      EFI_ERR(4)
#define EFI_BUFFER_TOO_SMALL     EFI_ERR(5)
#define EFI_NOT_READY            EFI_ERR(6)
#define EFI_DEVICE_ERROR         EFI_ERR(7)
#define EFI_WRITE_PROTECTED      EFI_ERR(8)
#define EFI_OUT_OF_RESOURCES     EFI_ERR(9)
#define EFI_VOLUME_CORRUPTED     EFI_ERR(10)
#define EFI_VOLUME_FULL          EFI_ERR(11)
#define EFI_NO_MEDIA             EFI_ERR(12)
#define EFI_MEDIA_CHANGED        EFI_ERR(13)
#define EFI_NOT_FOUND            EFI_ERR(14)
#define EFI_ACCESS_DENIED        EFI_ERR(15)
#define EFI_NO_RESPONSE          EFI_ERR(16)
#define EFI_NO_MAPPING           EFI_ERR(17)
#define EFI_TIMEOUT              EFI_ERR(18)
#define EFI_NOT_STARTED          EFI_ERR(19)
#define EFI_ALREADY_STARTED      EFI_ERR(20)
#define EFI_ABORTED              EFI_ERR(21)
#define EFI_ICMP_ERROR           EFI_ERR(22)
#define EFI_TFTP_ERROR           EFI_ERR(23)
#define EFI_PROTOCOL_ERROR       EFI_ERR(24)
#define EFI_INCOMPATIBLE_VERSION EFI_ERR(25)
#define EFI_SECURITY_VIOLATION   EFI_ERR(26)
#define EFI_CRC_ERROR            EFI_ERR(27)
#define EFI_END_OF_MEDIA         EFI_ERR(28)
#define EFI_END_OF_FILE          EFI_ERR(31)
#define EFI_INVALID_LANGUAGE     EFI_ERR(32)
#define EFI_COMPROMISED_DATA     EFI_ERR(33)
#define EFI_IP_ADDRESS_CONFLICT  EFI_ERR(34)
#define EFI_HTTP_ERROR           EFI_ERR(35)

// TODO: figure out where to put these. They're just mentioned in passing in the
// spec as some of many industry standard GUIDs but not part of the spec itself.
#define ACPI_TABLE_GUID \
    {0xeb9d2d30, 0x2d88, 0x11d3, {0x9a, 0x16, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d}}
#define ACPI_20_TABLE_GUID \
    {0x8868e871, 0xe4f1, 0x11d3, {0xbc, 0x22, 0x00, 0x80, 0xc7, 0x3c, 0x88, 0x81}}
#define SMBIOS_TABLE_GUID \
    {0xeb9d2d31, 0x2d88, 0x11d3, {0x9a, 0x16, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d}}
#define SMBIOS3_TABLE_GUID \
    {0xf2fd1544, 0x9794, 0x4a2c, {0x99, 0x2e, 0xe5, 0xbb, 0xcf, 0x20, 0xe3, 0x94}}
#define DEVICE_TREE_GUID \
    {0xb1b621d5, 0xf19c, 0x41a5, {0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0}}


typedef struct {
    uint64_t Signature;
    uint32_t Revision;
    uint32_t HeaderSize;
    uint32_t CRC32;
    uint32_t Reserved;
} efi_table_header;

typedef struct efi_guid {
    uint32_t data1;
    uint16_t data2;
    uint16_t data3;
    uint8_t data4[8];

        bool equals(const efi_guid& other) const {
                bool matches = data1 == other.data1 && data2 == other.data2
                        && data3 == other.data3;
                for (auto i = 0; matches && i < 8; i++)
                        matches = data4[i] == other.data4[i];
                return matches;
        }
} efi_guid;

typedef void* efi_handle;

typedef size_t efi_status;

typedef struct {
    uint8_t addr[32];
} efi_mac_addr;

typedef struct {
    uint8_t addr[4];
} efi_ipv4_addr;

typedef struct {
    uint8_t addr[16];
} efi_ipv6_addr;

typedef union {
    efi_ipv4_addr v4;
    efi_ipv6_addr v6;
} efi_ip_addr;

// This really belongs in boot-services.h, but causes circular dependencies with
// device-path.h.
typedef enum {
    EfiReservedMemoryType,
    EfiLoaderCode,
    EfiLoaderData,
    EfiBootServicesCode,
    EfiBootServicesData,
    EfiRuntimeServicesCode,
    EfiRuntimeServicesData,
    EfiConventionalMemory,
    EfiUnusableMemory,
    EfiACPIReclaimMemory,
    EfiACPIMemoryNVS,
    EfiMemoryMappedIO,
    EfiMemoryMappedIOPortSpace,
    EfiPalCode,
    EfiPersistentMemory,
    EfiMaxMemoryType
} efi_memory_type;

typedef uint64_t efi_physical_addr;
typedef uint64_t efi_virtual_addr;

typedef void* efi_event;

#define EVT_TIMER                         0x80000000
#define EVT_RUNTIME                       0x40000000
#define EVT_NOTIFY_WAIT                   0x00000100
#define EVT_NOTIFY_SIGNAL                 0x00000200
#define EVT_SIGNAL_EXIT_BOOT_SERVICES     0x00000201
#define EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE 0x60000202

#define EFI_EVENT_GROUP_EXIT_BOOT_SERVICES \
    {0x27abf055, 0xb1b8, 0x4c26, {0x80, 0x48, 0x74, 0x8f, 0x37, 0xba, 0xa2, 0xdf}}
#define EFI_EVENT_GROUP_VIRTUAL_ADDRESS_CHANGE \
    {0x13fa7698, 0xc831, 0x49c7, {0x87, 0xea, 0x8f, 0x43, 0xfc, 0xc2, 0x51, 0x96}}
#define EFI_EVENT_GROUP_MEMORY_MAP_CHANGE \
    {0x78bee926, 0x692f, 0x48fd, {0x9e, 0xdb, 0x01, 0x42, 0x2e, 0xf0, 0xd7, 0xab}}
#define EFI_EVENT_GROUP_READY_TO_BOOT \
    {0x7ce88fb3, 0x4bd7, 0x4679, {0x87, 0xa8, 0xa8, 0xd8, 0xde, 0xe5, 0x0d, 0x2b}}

typedef void (*efi_event_notify) (efi_event event, void* ctx) EFIAPI;

typedef enum {
    TimerCancel,
    TimerPeriodic,
    TimerRelative
} efi_timer_delay;

#ifndef __cplusplus
typedef unsigned short char16_t;
#endif