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//! Configuration table utilities.
//!
//! The configuration table is an array of GUIDs and pointers to extra system tables.
//!
//! For example, it can be used to find the ACPI tables.
//!
//! This module contains the actual entries of the configuration table,
//! as well as GUIDs for many known vendor tables.

#![allow(clippy::unreadable_literal)]

use crate::Guid;
use bitflags::bitflags;
use core::ffi::c_void;

/// Contains a set of GUID / pointer for a vendor-specific table.
///
/// The UEFI standard guarantees each entry is unique.
#[derive(Debug)]
#[repr(C)]
pub struct ConfigTableEntry {
    /// The GUID identifying this table.
    pub guid: Guid,
    /// The starting address of this table.
    ///
    /// Whether this is a physical or virtual address depends on the table.
    pub address: *const c_void,
}

/// Entry pointing to the old ACPI 1 RSDP.
pub const ACPI_GUID: Guid = Guid::from_values(
    0xeb9d2d30,
    0x2d88,
    0x11d3,
    0x9a16,
    [0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d],
);

///Entry pointing to the ACPI 2 RSDP.
pub const ACPI2_GUID: Guid = Guid::from_values(
    0x8868e871,
    0xe4f1,
    0x11d3,
    0xbc22,
    [0x00, 0x80, 0xc7, 0x3c, 0x88, 0x81],
);

/// Entry pointing to the SMBIOS 1.0 table.
pub const SMBIOS_GUID: Guid = Guid::from_values(
    0xeb9d2d31,
    0x2d88,
    0x11d3,
    0x9a16,
    [0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d],
);

/// Entry pointing to the SMBIOS 3.0 table.
pub const SMBIOS3_GUID: Guid = Guid::from_values(
    0xf2fd1544,
    0x9794,
    0x4a2c,
    0x992e,
    [0xe5, 0xbb, 0xcf, 0x20, 0xe3, 0x94],
);

/// GUID of the UEFI properties table.
///
/// The properties table is used to provide additional info
/// about the UEFI implementation.
pub const PROPERTIES_TABLE_GUID: Guid = Guid::from_values(
    0x880aaca3,
    0x4adc,
    0x4a04,
    0x9079,
    [0xb7, 0x47, 0x34, 0x08, 0x25, 0xe5],
);

/// This table contains additional information about the UEFI implementation.
#[repr(C)]
pub struct PropertiesTable {
    /// Version of the UEFI properties table.
    ///
    /// The only valid version currently is 0x10_000.
    pub version: u32,
    /// Length in bytes of this table.
    ///
    /// The initial version's length is 16.
    pub length: u32,
    /// Memory protection attributes.
    pub memory_protection: MemoryProtectionAttribute,
}

bitflags! {
    /// Flags describing memory protection.
    pub struct MemoryProtectionAttribute: usize {
        /// If this bit is set, then the UEFI implementation will mark pages
        /// containing data as non-executable.
        const NON_EXECUTABLE_DATA = 1;
    }
}

/// Hand-off Blocks are used to pass data from the early pre-UEFI environment to the UEFI drivers.
///
/// Most OS loaders or applications should not mess with this.
pub const HAND_OFF_BLOCK_LIST_GUID: Guid = Guid::from_values(
    0x7739f24c,
    0x93d7,
    0x11d4,
    0x9a3a,
    [0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d],
);

/// Table used in the early boot environment to record memory ranges.
pub const MEMORY_TYPE_INFORMATION_GUID: Guid = Guid::from_values(
    0x4c19049f,
    0x4137,
    0x4dd3,
    0x9c10,
    [0x8b, 0x97, 0xa8, 0x3f, 0xfd, 0xfa],
);

/// Used to identify Hand-off Blocks which store
/// status codes reported during the pre-UEFI environment.
pub const MEMORY_STATUS_CODE_RECORD_GUID: Guid = Guid::from_values(
    0x60cc026,
    0x4c0d,
    0x4dda,
    0x8f41,
    [0x59, 0x5f, 0xef, 0x00, 0xa5, 0x02],
);

/// Table which provides Driver eXecution Environment services.
pub const DXE_SERVICES_GUID: Guid = Guid::from_values(
    0x5ad34ba,
    0x6f02,
    0x4214,
    0x952e,
    [0x4d, 0xa0, 0x39, 0x8e, 0x2b, 0xb9],
);

/// LZMA-compressed filesystem.
pub const LZMA_COMPRESS_GUID: Guid = Guid::from_values(
    0xee4e5898,
    0x3914,
    0x4259,
    0x9d6e,
    [0xdc, 0x7b, 0xd7, 0x94, 0x03, 0xcf],
);

/// A custom compressed filesystem used by the Tiano UEFI implementation.
pub const TIANO_COMPRESS_GUID: Guid = Guid::from_values(
    0xa31280ad,
    0x481e,
    0x41b6,
    0x95e8,
    [0x12, 0x7f, 0x4c, 0x98, 0x47, 0x79],
);

/// Pointer to the debug image info table.
pub const DEBUG_IMAGE_INFO_GUID: Guid = Guid::from_values(
    0x49152e77,
    0x1ada,
    0x4764,
    0xb7a2,
    [0x7a, 0xfe, 0xfe, 0xd9, 0x5e, 0x8b],
);