LpcACPIEC.p

//  PawnIO Modules - Modules for various hardware to be used with PawnIO.
//  Copyright (C) 2023  namazso <admin@namazso.eu>
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
//  SPDX-License-Identifier: LGPL-2.1-or-later

#include <pawnio.inc>

is_port_allowed(port) {
    return port == 0x62 || port == 0x66;
}

/// Read byte from ACPI EC.
///
/// @param in [0] = Port
/// @param in_size Must be 1
/// @param out [0] = Value read
/// @param out_size Must be 1
/// @return An NTSTATUS
/// @warning You should acquire the "\BaseNamedObjects\Access_EC" mutant before calling this
DEFINE_IOCTL_SIZED(ioctl_pio_read, 1, 1) {
    new port = in[0] & 0xFFFF;

    if (!is_port_allowed(port))
        return STATUS_ACCESS_DENIED;

    out[0] = io_in_byte(port);
    return STATUS_SUCCESS;
}

/// Write byte to ACPI EC.
///
/// @param in [0] = Port, [1] = Value
/// @param in_size Must be 2
/// @param out Unused
/// @param out_size Unused
/// @return An NTSTATUS
/// @warning You should acquire the "\BaseNamedObjects\Access_EC" mutant before calling this
DEFINE_IOCTL_SIZED(ioctl_pio_write, 2, 0) {
    new port = in[0] & 0xFFFF;
    new value = in[1];

    if (!is_port_allowed(port))
        return STATUS_ACCESS_DENIED;

    io_out_byte(port, value);
    return STATUS_SUCCESS;
}

// TODO: Should probably move register read and write from usermode

NTSTATUS:main() {
    return STATUS_SUCCESS;
}