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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0/****************************************************************************** * * Module Name: hwxface - Public ACPICA hardware interfaces * * Copyright (C) 2000 - 2019, Intel Corp. * *****************************************************************************/ACPI_MODULE_NAME("hwxface")/****************************************************************************** * * FUNCTION: acpi_reset * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Set reset register in memory or IO space. Note: Does not * support reset register in PCI config space, this must be * handled separately. * ******************************************************************************/acpi_status acpi_reset(void){ struct acpi_generic_address *reset_reg; acpi_status status; ACPI_FUNCTION_TRACE(acpi_reset); reset_reg = &acpi_gbl_FADT.reset_register; /* Check if the reset register is supported */ if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) || !reset_reg->address) { return_ACPI_STATUS(AE_NOT_EXIST); } if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { /* * For I/O space, write directly to the OSL. This bypasses the port * validation mechanism, which may block a valid write to the reset * register. * * NOTE: * The ACPI spec requires the reset register width to be 8, so we * hardcode it here and ignore the FADT value. This maintains * compatibility with other ACPI implementations that have allowed * BIOS code with bad register width values to go unnoticed. */ status = acpi_os_write_port((acpi_io_address)reset_reg->address, acpi_gbl_FADT.reset_value, ACPI_RESET_REGISTER_WIDTH); } else { /* Write the reset value to the reset register */ status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg); } return_ACPI_STATUS(status);}ACPI_EXPORT_SYMBOL(acpi_reset)/****************************************************************************** * * FUNCTION: acpi_read * * PARAMETERS: value - Where the value is returned * reg - GAS register structure * * RETURN: Status * * DESCRIPTION: Read from either memory or IO space. * * LIMITATIONS: <These limitations also apply to acpi_write> * bit_width must be exactly 8, 16, 32, or 64. * space_ID must be system_memory or system_IO. * bit_offset and access_width are currently ignored, as there has * not been a need to implement these. * ******************************************************************************/acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg)