295 lines
8.6 KiB
C
295 lines
8.6 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: hwvalid - I/O request validation
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*
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* Copyright (C) 2000 - 2019, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#define _COMPONENT ACPI_HARDWARE
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ACPI_MODULE_NAME("hwvalid")
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/* Local prototypes */
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static acpi_status
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acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width);
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/*
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* Protected I/O ports. Some ports are always illegal, and some are
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* conditionally illegal. This table must remain ordered by port address.
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*
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* The table is used to implement the Microsoft port access rules that
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* first appeared in Windows XP. Some ports are always illegal, and some
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* ports are only illegal if the BIOS calls _OSI with a win_XP string or
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* later (meaning that the BIOS itelf is post-XP.)
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*
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* This provides ACPICA with the desired port protections and
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* Microsoft compatibility.
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*
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* Description of port entries:
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* DMA: DMA controller
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* PIC0: Programmable Interrupt Controller (8259A)
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* PIT1: System Timer 1
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* PIT2: System Timer 2 failsafe
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* RTC: Real-time clock
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* CMOS: Extended CMOS
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* DMA1: DMA 1 page registers
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* DMA1L: DMA 1 Ch 0 low page
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* DMA2: DMA 2 page registers
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* DMA2L: DMA 2 low page refresh
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* ARBC: Arbitration control
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* SETUP: Reserved system board setup
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* POS: POS channel select
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* PIC1: Cascaded PIC
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* IDMA: ISA DMA
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* ELCR: PIC edge/level registers
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* PCI: PCI configuration space
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*/
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static const struct acpi_port_info acpi_protected_ports[] = {
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{"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP},
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{"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL},
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{"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP},
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{"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
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{"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
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{"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
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{"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP},
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{"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
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{"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP},
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{"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
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{"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP},
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{"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP},
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{"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP},
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{"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL},
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{"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP},
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{"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},
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{"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP}
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};
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#define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (acpi_protected_ports)
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/******************************************************************************
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*
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* FUNCTION: acpi_hw_validate_io_request
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*
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* PARAMETERS: Address Address of I/O port/register
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* bit_width Number of bits (8,16,32)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Validates an I/O request (address/length). Certain ports are
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* always illegal and some ports are only illegal depending on
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* the requests the BIOS AML code makes to the predefined
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* _OSI method.
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*
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******************************************************************************/
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static acpi_status
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acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
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{
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u32 i;
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u32 byte_width;
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acpi_io_address last_address;
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const struct acpi_port_info *port_info;
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ACPI_FUNCTION_TRACE(hw_validate_io_request);
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/* Supported widths are 8/16/32 */
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if ((bit_width != 8) && (bit_width != 16) && (bit_width != 32)) {
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ACPI_ERROR((AE_INFO,
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"Bad BitWidth parameter: %8.8X", bit_width));
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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port_info = acpi_protected_ports;
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byte_width = ACPI_DIV_8(bit_width);
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last_address = address + byte_width - 1;
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ACPI_DEBUG_PRINT((ACPI_DB_IO,
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"Address %8.8X%8.8X LastAddress %8.8X%8.8X Length %X",
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ACPI_FORMAT_UINT64(address),
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ACPI_FORMAT_UINT64(last_address), byte_width));
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/* Maximum 16-bit address in I/O space */
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if (last_address > ACPI_UINT16_MAX) {
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ACPI_ERROR((AE_INFO,
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"Illegal I/O port address/length above 64K: %8.8X%8.8X/0x%X",
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ACPI_FORMAT_UINT64(address), byte_width));
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return_ACPI_STATUS(AE_LIMIT);
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}
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/* Exit if requested address is not within the protected port table */
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if (address > acpi_protected_ports[ACPI_PORT_INFO_ENTRIES - 1].end) {
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return_ACPI_STATUS(AE_OK);
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}
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/* Check request against the list of protected I/O ports */
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for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, port_info++) {
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/*
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* Check if the requested address range will write to a reserved
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* port. There are four cases to consider:
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*
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* 1) Address range is contained completely in the port address range
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* 2) Address range overlaps port range at the port range start
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* 3) Address range overlaps port range at the port range end
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* 4) Address range completely encompasses the port range
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*/
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if ((address <= port_info->end)
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&& (last_address >= port_info->start)) {
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/* Port illegality may depend on the _OSI calls made by the BIOS */
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if (acpi_gbl_osi_data >= port_info->osi_dependency) {
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ACPI_DEBUG_PRINT((ACPI_DB_VALUES,
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"Denied AML access to port 0x%8.8X%8.8X/%X (%s 0x%.4X-0x%.4X)\n",
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ACPI_FORMAT_UINT64(address),
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byte_width, port_info->name,
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port_info->start,
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port_info->end));
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return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
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}
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}
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/* Finished if address range ends before the end of this port */
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if (last_address <= port_info->end) {
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break;
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}
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}
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return_ACPI_STATUS(AE_OK);
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}
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/******************************************************************************
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*
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* FUNCTION: acpi_hw_read_port
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*
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* PARAMETERS: Address Address of I/O port/register to read
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* Value Where value (data) is returned
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* Width Number of bits
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*
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* RETURN: Status and value read from port
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*
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* DESCRIPTION: Read data from an I/O port or register. This is a front-end
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* to acpi_os_read_port that performs validation on both the port
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* address and the length.
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*
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*****************************************************************************/
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acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width)
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{
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acpi_status status;
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u32 one_byte;
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u32 i;
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/* Truncate address to 16 bits if requested */
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if (acpi_gbl_truncate_io_addresses) {
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address &= ACPI_UINT16_MAX;
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}
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/* Validate the entire request and perform the I/O */
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status = acpi_hw_validate_io_request(address, width);
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if (ACPI_SUCCESS(status)) {
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status = acpi_os_read_port(address, value, width);
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return (status);
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}
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if (status != AE_AML_ILLEGAL_ADDRESS) {
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return (status);
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}
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/*
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* There has been a protection violation within the request. Fall
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* back to byte granularity port I/O and ignore the failing bytes.
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* This provides compatibility with other ACPI implementations.
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*/
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for (i = 0, *value = 0; i < width; i += 8) {
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/* Validate and read one byte */
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if (acpi_hw_validate_io_request(address, 8) == AE_OK) {
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status = acpi_os_read_port(address, &one_byte, 8);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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*value |= (one_byte << i);
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}
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address++;
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}
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return (AE_OK);
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}
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/******************************************************************************
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*
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* FUNCTION: acpi_hw_write_port
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*
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* PARAMETERS: Address Address of I/O port/register to write
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* Value Value to write
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* Width Number of bits
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write data to an I/O port or register. This is a front-end
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* to acpi_os_write_port that performs validation on both the port
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* address and the length.
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*
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*****************************************************************************/
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acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width)
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{
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acpi_status status;
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u32 i;
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/* Truncate address to 16 bits if requested */
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if (acpi_gbl_truncate_io_addresses) {
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address &= ACPI_UINT16_MAX;
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}
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/* Validate the entire request and perform the I/O */
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status = acpi_hw_validate_io_request(address, width);
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if (ACPI_SUCCESS(status)) {
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status = acpi_os_write_port(address, value, width);
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return (status);
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}
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if (status != AE_AML_ILLEGAL_ADDRESS) {
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return (status);
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}
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/*
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* There has been a protection violation within the request. Fall
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* back to byte granularity port I/O and ignore the failing bytes.
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* This provides compatibility with other ACPI implementations.
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*/
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for (i = 0; i < width; i += 8) {
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/* Validate and write one byte */
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if (acpi_hw_validate_io_request(address, 8) == AE_OK) {
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status =
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acpi_os_write_port(address, (value >> i) & 0xFF, 8);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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}
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address++;
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}
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return (AE_OK);
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}
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