// Copyright 2021 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.
library fuchsia.hardware.acpi;

using zx;
using fuchsia.mem;

/// ACPI Object Types.
/// See ACPI spec v6.4, 19.6.96 - ObjectType (Get Object Type).
type ObjectType = flexible enum {
    ANY = 0;
    INTEGER = 1;
    STRING = 2;
    BUFFER = 3;
    PACKAGE = 4;
    FIELD_UNIT = 5;
    DEVICE = 6;
    EVENT = 7;
    METHOD = 8;
    MUTEX = 9;
    OPERATION_REGION = 10;
    POWER_RESOURCE = 11;
    THERMAL_ZONE = 13;
    BUFFER_FIELD = 14;
    DEBUG_OBJECT = 16;
};

/// ACPI status codes.
// These are identical to the ACPICA errors at
// //third_party/acpica/include/acpica/acexcep.h.
type Status = flexible enum {
    /// Success.
    OK = 0;
    /// Unknown error occurred.
    ERROR = 0x01;
    /// Couldn't find ACPI tables.
    NO_ACPI_TABLES = 0x02;
    /// No namespace loaded.
    NO_NAMESPACE = 0x03;
    /// Ran out of memory.
    NO_MEMORY = 0x04;
    /// Requested entity not found.
    NOT_FOUND = 0x05;
    /// Required entity does not exist.
    NOT_EXIST = 0x06;
    /// Entity already exists.
    ALREADY_EXISTS = 0x07;
    /// Incorrect object type.
    TYPE = 0x08;
    /// Required object is missing.
    NULL_OBJECT = 0x09;
    /// Requested object does not exist.
    NULL_ENTRY = 0x0a;
    /// Provided buffer was too small.
    BUFFER_OVERFLOW = 0x0b;
    /// Internal stack overflow.
    STACK_OVERFLOW = 0x0c;
    /// Internal stack underflow.
    STACK_UNDERFLOW = 0x0d;
    /// Not implemented.
    NOT_IMPLEMENTED = 0x0e;
    /// Not supported.
    NOT_SUPPORTED = 0x0f;
    /// A predefined limit was exceeded.
    LIMIT = 0x10;
    /// A timeout expired.
    TIME = 0x11;
    /// A mutex was acquired in improper order.
    ACQUIRE_DEADLOCK = 0x12;
    /// A mutex was released in improper order.
    RELEASE_DEADLOCK = 0x13;
    /// Attempted to release a mutex without acquiring it.
    NOT_ACQUIRED = 0x14;
    /// Attempted to acquire a mutex twice.
    ALREADY_ACQUIRED = 0x15;
    /// Hardware did not respond to an I/O operation.
    NO_HARDWARE_RESPONSE = 0x16;
    /// There is no global lock.
    NO_GLOBAL_LOCK = 0x17;
    /// A control method was aborted.
    ABORT_METHOD = 0x18;
    /// Attempt was made to install a handler that is already installed.
    SAME_HANDLER = 0x19;
    /// A handler for this operation is not installed.
    NO_HANDLER = 0x1a;
    /// There are no more Owner IDs available for ACPI tables or control methods.
    OWNER_ID_LIMIT = 0x1b;
    /// The interface is not part of the current subsystem configuration.
    NOT_CONFIGURED = 0x1c;
    /// Permission denied for the requested operation.
    ACCESS = 0x1d;
    /// An I/O error occurred.
    IO_ERROR = 0x1e;
    /// Overflow during string-to-integer conversion.
    NUMERIC_OVERFLOW = 0x1f;
    /// Overflow during ASCII hex-to-binary conversion.
    HEX_OVERFLOW = 0x20;
    /// Overflow during ASCII decimal-to-binary conversion.
    DECIMAL_OVERFLOW = 0x21;
    /// Overflow during ASCII octal-to-binary conversion.
    OCTAL_OVERFLOW = 0x22;
    /// Reached the end of the table.
    END_OF_TABLE = 0x23;

    /// Invalid paramter supplied.
    BAD_PARAMETER = 0x1001;
    /// Invalid character in a name.
    BAD_CHARACTER = 0x1002;
    /// Invalid character in a pathname.
    BAD_PATHNAME = 0x1003;
    /// Package or buffer contained incorrect data.
    BAD_DATA = 0x1004;
    /// Invalid character in a hex constant.
    BAD_HEX_CONSTANT = 0x1005;
    /// Invalid character in an octal constant.
    BAD_OCTAL_CONSTANT = 0x1006;
    /// Invalid character in a decimal constant.
    BAD_DECIMAL_CONSTANT = 0x1007;
    /// Too few arguments passed to a method.
    MISSING_ARGUMENTS = 0x1008;
    /// Illegal null I/O addres.
    BAD_ADDRESS = 0x1009;

    /// Bad ACPI table signature.
    BAD_TABLE_SIGNATURE = 0x2001;
    /// Invalid field in ACPI table header.
    BAD_TABLE_HEADER = 0x2002;
    /// ACPI table checksum is incorrect.
    BAD_TABLE_CHECKSUM = 0x2003;
    /// Invalid value found in an ACPI table.
    BAD_TABLE_VALUE = 0x2004;
    /// The FADT or FACS has an improper length.
    INVALID_TABLE_LENGTH = 0x2005;

    /// Invalid AML opcode.
    AML_BAD_OPCODE = 0x3001;
    /// Missing operand.
    AML_NO_OPERAND = 0x3002;
    /// Operand has incorrect type.
    AML_OPERAND_TYPE = 0x3003;
    /// Operand has inappropriate or invalid value.
    AML_OPERAND_VALUE = 0x3004;
    /// Method tried to use uninitialized local variable.
    AML_UNINITIALIZED_LOCAL = 0x3005;
    /// Method tried to use uninitialized argument.
    AML_UNINITIALIZED_ARG = 0x3006;
    /// Method tried to use an empty package element.
    AML_UNINITIALIZED_ELEMENT = 0x3007;
    /// Overflow during numeric conversion.
    AML_NUMERIC_OVERFLOW = 0x3008;
    /// Tried to access beyond the end of an Operation Region.
    AML_REGION_LIMIT = 0x3009;
    /// Tried to access beyond the end of a buffer.
    AML_BUFFER_LIMIT = 0x300a;
    /// Tried to access beyond the end of a package.
    AML_PACKAGE_LIMIT = 0x300b;
    /// Tried to divide by zero.
    AML_DIVIDE_BY_ZERO = 0x300c;
    /// ACPI name contains invalid characters.
    AML_BAD_NAME = 0x300d;
    /// Couldn't resolve a reference.
    AML_NAME_NOT_FOUND = 0x300e;
    /// Internal error within the AML interpreter.
    AML_INTERNAL = 0x300f;
    /// Operation Region SpaceID is invalid.
    AML_INVALID_SPACE_ID = 0x3010;
    /// String is longer than 200 characters.
    AML_STRING_LIMIT = 0x3011;
    /// Method did not return a required value.
    AML_NO_RETURN_VALUE = 0x3012;
    /// Method reached maximum reentrancy limit.
    AML_METHOD_LIMIT = 0x3013;
    /// A thread tried to release a mutex it doesn't own.
    AML_NOT_OWNER = 0x3014;
    /// Mutex SyncLevel release mismatch.
    AML_MUTEX_ORDER = 0x3015;
    /// Attempt to release mutex that was not previously acquired.
    AML_MUTEX_NOT_ACQUIRED = 0x3016;
    /// Invalid resource type in resource list.
    AML_INVALID_RESOURCE_TYPE = 0x3017;
    /// Invalid Argx/Localx (x too large).
    AML_INVALID_INDEX = 0x3018;
    /// Bank value or Index value beyond the range of a register.
    AML_REGISTER_LIMIT = 0x3019;
    /// Break or Continue without a While.
    AML_NO_WHILE = 0x301a;
    /// Unaligned memory transfer on platform that doesn't support this.
    AML_ALIGNMENT = 0x301b;
    /// No End Tag in a resource list.
    AML_NO_RESOURCE_END_TAG = 0x301c;
    /// Invalid value in a resource.
    AML_BAD_RESOURCE_VALUE = 0x301d;
    /// Two references refer to each other.
    AML_CIRCULAR_REFERENCE = 0x301e;
    /// The length of a resource descriptor in the AML is incorrect.
    AML_BAD_RESOURCE_LENGTH = 0x301f;
    /// A memory, I/O, or PCI configuration address is invalid.
    AML_ILLEGAL_ADDRESS = 0x3020;
    /// An AML While loop exceeded the maximum execution time.
    AML_LOOP_TIMEOUT = 0x3021;
    /// A namespace node is uninitialized or unresolved.
    AML_UNINITIALIZED_NODE = 0x3022;
    /// A target operand of an incorrect type was encountered.
    AML_TARGET_TYPE = 0x3023;
    /// Violation of a fixed ACPI protocol.
    AML_PROTOCOL = 0x3024;
    /// The length of the buffer is invalid/incorrect.
    AML_BUFFER_LENGTH = 0x3025;
};

/// Type that should be returned by |Device.EvaluateObject|.
type EvaluateObjectMode = flexible enum {
    /// Return an Object.
    PLAIN_OBJECT = 0;
    /// Treat the returned buffer as a resource template. Parse it and return
    /// any resources that are found.
    PARSE_RESOURCES = 1;
};

/// A handle to an arbitrary path in the ACPI tree.
type Handle = struct {
    /// Type of the object this handle refers to.
    object_type ObjectType;
    /// Relative path to the object this handle refers to.
    path string:MAX;
};

/// Represents a Processor declaration.
type Processor = struct {
    id uint32;
    pblk_address uint64;
    pblk_length uint32;
};

/// Represents a PowerResource.
type PowerResource = struct {
    /// Deepest system sleep level that must be maintained to keep this resource
    /// on.
    system_level uint32;
    /// Resource order that this power resource belongs to.
    resource_order uint32;
};

// TODO(fxbug.dev/35218): This is a hack to work around the fact that FIDL
// doesn't like unions with recursive types.
type ObjectList = struct {
    value vector<Object>:<MAX, optional>;
};

/// Represents an object passed to or returned by
/// fuchsia.hardware.acpi/Device.EvaluateMethod().
type Object = flexible union {
    1: integer_val uint64;
    2: string_val string:MAX;
    3: buffer_val bytes;
    4: package_val ObjectList;
    5: reference_val Handle;
    6: processor_val Processor;
    7: power_resource_val PowerResource;
};

/// Represents a resource.
type Resource = flexible resource union {
    /// A region of physical memory.
    1: mmio fuchsia.mem.Range;
    /// An interrupt.
    2: irq zx.handle:INTERRUPT;
    /// An I/O port.
    3: pio zx.handle:RESOURCE;
};

/// Result of evaluating an object, returned by Device.EvaluateObject().
type EncodedObject = flexible resource union {
    /// Always returned for EvaluateObjectMode.PLAIN_OBJECT.
    1: object Object;
    /// Always returned for EvaluateObjectMode.PARSE_RESOURCES.
    2: resources vector<Resource>:MAX;
};

/// Maximum number of arguments that can be passed to a method.
/// ACPI Spec 6.4, Section 19.6.84 "Method (Declare Control Method)".
const MAX_METHOD_ARG uint32 = 7;

/// Provides access to an ACPI device.
@discoverable
protocol Device {
    /// If ACPI has determined this device is a bus, returns the bus ID.
    /// Errors:
    /// * ZX_ERR_BAD_STATE - the device is not a bus as far as ACPI is aware.
    GetBusId() -> (struct {
        /// Unique ID of this bus on the system.
        /// This ID is not necessarily constant between boots of the same system,
        /// but it remains stable for a single boot.
        bus_id uint32;
    }) error zx.status;

    /// Get the interrupt at `index` for this device.
    /// Errors:
    /// * ZX_ERR_OUT_OF_RANGE - `index` is out of range.
    /// * ZX_ERR_INVALID_ARGS - the interrupt type described by ACPI is unrecognised.
    /// * ZX_ERR_INTERNAL - an internal error occured (e.g. failure to evaluate ACPI tables).
    MapInterrupt(struct {
        index uint64;
    }) -> (resource struct {
        irq zx.handle:INTERRUPT;
    }) error zx.status;

    /// Get the I/O port at `index` for this device.
    /// Errors:
    /// * ZX_ERR_OUT_OF_RANGE - `index` is out of range.
    /// * ZX_ERR_INTERNAL - an internal error occured (e.g. failure to evaluate ACPI tables).
    GetPio(struct {
        index uint32;
    }) -> (resource struct {
        pio zx.handle:RESOURCE;
    }) error zx.status;

    /// Get the MMIO region at `index` for this device.
    /// Errors:
    /// * ZX_ERR_OUT_OF_RANGE - `index` is out of range.
    /// * ZX_ERR_INTERNAL - an internal error occured (e.g. failure to evaluate ACPI tables).
    /// * ZX_ERR_INVALID_ARGS - the MMIO region described by ACPI is not page-aligned.
    GetMmio(struct {
        index uint32;
    }) -> (resource struct {
        mmio fuchsia.mem.Range;
    }) error zx.status;

    /// Get the BTI at `index` for this device.
    ///
    /// This operation is not supported on devices that exist on another bus (e.g. PCI) --
    /// they should use their bus's GetBti() equivalent to access a BTI.
    /// Errors:
    /// * ZX_ERR_NOT_SUPPORTED - the device is not a pure ACPI device.
    /// * ZX_ERR_OUT_OF_RANGE - `index` is out of range for the device.
    GetBti(struct {
        index uint32;
    }) -> (resource struct {
        bti zx.handle:BTI;
    }) error zx.status;

    /// Evaluate the object at the given |path|, relative to this device, with |parameters| as
    /// arguments.
    /// |mode| determines how the return value is treated, see
    /// |fuchsia.hardware.acpi/EvaluateObjectMode|.
    /// Paths cannot be absolute, and must only refer to children of this
    /// device.
    /// |result| is the result of the evaluation. See |fuchsia.hardware.acpi/EncodedObject| for more
    /// information.
    /// Errors:
    /// * ACCESS - |path| does not refer to a child of this device.
    /// * AML_* - internal errors while evaluating the AML bytecode.
    /// * BAD_CHARACTER - an invalid character was found in the path.
    /// * BAD_PATHNAME - the path contained at least one ill-formated entry.
    /// * ERROR - An internal error occurred.
    /// * NOT_FOUND - There is no object at the specified path.
    /// * NOT_IMPLEMENTED - An unsupported |mode| or |parameters| was supplied, or evaluation
    ///   returned an unsupported Object type.
    /// * TYPE - The object is of a type that cannot be evaluated.
    EvaluateObject(struct {
        path string:MAX;
        mode EvaluateObjectMode;
        parameters vector<Object>:<MAX_METHOD_ARG, optional>;
    }) -> (resource struct {
        result EncodedObject:<optional>;
    }) error Status;

    /// Install a Device Object Notification handler for the given notification
    /// type. A device can only have a single notification handler at a time.
    /// Errors:
    /// * BAD_PARAMETER - if "mode" is invalid.
    /// * ALREADY_EXISTS - if a handler is already installed.
    InstallNotifyHandler(resource struct {
        mode NotificationMode;
        handler client_end:NotifyHandler;
    }) -> (struct {}) error Status;

    /// Acquire the ACPI global lock. This is only permitted for devices which
    /// have a _GLK entry in their namespace. See ACPI v6.4, Section 6.5.7 "_GLK
    /// (Global Lock)".
    /// This method will not return until the global lock has been acquired.
    /// Errors:
    /// * ACCESS - if "_GLK" is not present, or if "_GLK" does not evaluate to 1.
    AcquireGlobalLock() -> (resource struct {
        handle client_end:GlobalLock;
    }) error Status;

    /// Install an address space handler for this device.
    /// Errors:
    /// * ALREADY_EXISTS - if a handler is already installed.
    /// * NOT_SUPPORTED - the AddressSpace supplied is not supported.
    InstallAddressSpaceHandler(resource struct {
        space AddressSpace;
        handler client_end:AddressSpaceHandler;
    }) -> (struct {}) error Status;
};