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Diffstat (limited to 'drivers/acpi/acpica/hwvalid.c')
| -rw-r--r-- | drivers/acpi/acpica/hwvalid.c | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/hwvalid.c b/drivers/acpi/acpica/hwvalid.c new file mode 100644 index 000000000..0cc4de3f7 --- /dev/null +++ b/drivers/acpi/acpica/hwvalid.c @@ -0,0 +1,325 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: hwvalid - I/O request validation + * + * Copyright (C) 2000 - 2020, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" + +#define _COMPONENT ACPI_HARDWARE +ACPI_MODULE_NAME("hwvalid") + +/* Local prototypes */ +static acpi_status +acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width); + +/* + * Protected I/O ports. Some ports are always illegal, and some are + * conditionally illegal. This table must remain ordered by port address. + * + * The table is used to implement the Microsoft port access rules that + * first appeared in Windows XP. Some ports are always illegal, and some + * ports are only illegal if the BIOS calls _OSI with nothing newer than + * the specific _OSI strings. + * + * This provides ACPICA with the desired port protections and + * Microsoft compatibility. + * + * Description of port entries: + * DMA: DMA controller + * PIC0: Programmable Interrupt Controller (8259A) + * PIT1: System Timer 1 + * PIT2: System Timer 2 failsafe + * RTC: Real-time clock + * CMOS: Extended CMOS + * DMA1: DMA 1 page registers + * DMA1L: DMA 1 Ch 0 low page + * DMA2: DMA 2 page registers + * DMA2L: DMA 2 low page refresh + * ARBC: Arbitration control + * SETUP: Reserved system board setup + * POS: POS channel select + * PIC1: Cascaded PIC + * IDMA: ISA DMA + * ELCR: PIC edge/level registers + * PCI: PCI configuration space + */ +static const struct acpi_port_info acpi_protected_ports[] = { + {"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP}, + {"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL}, + {"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP}, + {"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP}, + {"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP}, + {"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP}, + {"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP}, + {"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP}, + {"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP}, + {"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP}, + {"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP}, + {"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP}, + {"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP}, + {"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL}, + {"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP}, + {"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL}, + {"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP} +}; + +#define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (acpi_protected_ports) + +/****************************************************************************** + * + * FUNCTION: acpi_hw_validate_io_request + * + * PARAMETERS: Address Address of I/O port/register + * bit_width Number of bits (8,16,32) + * + * RETURN: Status + * + * DESCRIPTION: Validates an I/O request (address/length). Certain ports are + * always illegal and some ports are only illegal depending on + * the requests the BIOS AML code makes to the predefined + * _OSI method. + * + ******************************************************************************/ + +static acpi_status +acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width) +{ + u32 i; + u32 byte_width; + acpi_io_address last_address; + const struct acpi_port_info *port_info; + + ACPI_FUNCTION_TRACE(hw_validate_io_request); + + /* Supported widths are 8/16/32 */ + + if ((bit_width != 8) && (bit_width != 16) && (bit_width != 32)) { + ACPI_ERROR((AE_INFO, + "Bad BitWidth parameter: %8.8X", bit_width)); + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + port_info = acpi_protected_ports; + byte_width = ACPI_DIV_8(bit_width); + last_address = address + byte_width - 1; + + ACPI_DEBUG_PRINT((ACPI_DB_IO, + "Address %8.8X%8.8X LastAddress %8.8X%8.8X Length %X", + ACPI_FORMAT_UINT64(address), + ACPI_FORMAT_UINT64(last_address), byte_width)); + + /* Maximum 16-bit address in I/O space */ + + if (last_address > ACPI_UINT16_MAX) { + ACPI_ERROR((AE_INFO, + "Illegal I/O port address/length above 64K: %8.8X%8.8X/0x%X", + ACPI_FORMAT_UINT64(address), byte_width)); + return_ACPI_STATUS(AE_LIMIT); + } + + /* Exit if requested address is not within the protected port table */ + + if (address > acpi_protected_ports[ACPI_PORT_INFO_ENTRIES - 1].end) { + return_ACPI_STATUS(AE_OK); + } + + /* Check request against the list of protected I/O ports */ + + for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, port_info++) { + /* + * Check if the requested address range will write to a reserved + * port. There are four cases to consider: + * + * 1) Address range is contained completely in the port address range + * 2) Address range overlaps port range at the port range start + * 3) Address range overlaps port range at the port range end + * 4) Address range completely encompasses the port range + */ + if ((address <= port_info->end) + && (last_address >= port_info->start)) { + + /* Port illegality may depend on the _OSI calls made by the BIOS */ + + if (port_info->osi_dependency == ACPI_ALWAYS_ILLEGAL || + acpi_gbl_osi_data == port_info->osi_dependency) { + ACPI_DEBUG_PRINT((ACPI_DB_VALUES, + "Denied AML access to port 0x%8.8X%8.8X/%X (%s 0x%.4X-0x%.4X)\n", + ACPI_FORMAT_UINT64(address), + byte_width, port_info->name, + port_info->start, + port_info->end)); + + return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS); + } + } + + /* Finished if address range ends before the end of this port */ + + if (last_address <= port_info->end) { + break; + } + } + + return_ACPI_STATUS(AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_read_port + * + * PARAMETERS: Address Address of I/O port/register to read + * Value Where value (data) is returned + * Width Number of bits + * + * RETURN: Status and value read from port + * + * DESCRIPTION: Read data from an I/O port or register. This is a front-end + * to acpi_os_read_port that performs validation on both the port + * address and the length. + * + *****************************************************************************/ + +acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width) +{ + acpi_status status; + u32 one_byte; + u32 i; + + /* Truncate address to 16 bits if requested */ + + if (acpi_gbl_truncate_io_addresses) { + address &= ACPI_UINT16_MAX; + } + + /* Validate the entire request and perform the I/O */ + + status = acpi_hw_validate_io_request(address, width); + if (ACPI_SUCCESS(status)) { + status = acpi_os_read_port(address, value, width); + return (status); + } + + if (status != AE_AML_ILLEGAL_ADDRESS) { + return (status); + } + + /* + * There has been a protection violation within the request. Fall + * back to byte granularity port I/O and ignore the failing bytes. + * This provides compatibility with other ACPI implementations. + */ + for (i = 0, *value = 0; i < width; i += 8) { + + /* Validate and read one byte */ + + if (acpi_hw_validate_io_request(address, 8) == AE_OK) { + status = acpi_os_read_port(address, &one_byte, 8); + if (ACPI_FAILURE(status)) { + return (status); + } + + *value |= (one_byte << i); + } + + address++; + } + + return (AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_write_port + * + * PARAMETERS: Address Address of I/O port/register to write + * Value Value to write + * Width Number of bits + * + * RETURN: Status + * + * DESCRIPTION: Write data to an I/O port or register. This is a front-end + * to acpi_os_write_port that performs validation on both the port + * address and the length. + * + *****************************************************************************/ + +acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width) +{ + acpi_status status; + u32 i; + + /* Truncate address to 16 bits if requested */ + + if (acpi_gbl_truncate_io_addresses) { + address &= ACPI_UINT16_MAX; + } + + /* Validate the entire request and perform the I/O */ + + status = acpi_hw_validate_io_request(address, width); + if (ACPI_SUCCESS(status)) { + status = acpi_os_write_port(address, value, width); + return (status); + } + + if (status != AE_AML_ILLEGAL_ADDRESS) { + return (status); + } + + /* + * There has been a protection violation within the request. Fall + * back to byte granularity port I/O and ignore the failing bytes. + * This provides compatibility with other ACPI implementations. + */ + for (i = 0; i < width; i += 8) { + + /* Validate and write one byte */ + + if (acpi_hw_validate_io_request(address, 8) == AE_OK) { + status = + acpi_os_write_port(address, (value >> i) & 0xFF, 8); + if (ACPI_FAILURE(status)) { + return (status); + } + } + + address++; + } + + return (AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_validate_io_block + * + * PARAMETERS: Address Address of I/O port/register blobk + * bit_width Number of bits (8,16,32) in each register + * count Number of registers in the block + * + * RETURN: Status + * + * DESCRIPTION: Validates a block of I/O ports/registers. + * + ******************************************************************************/ + +acpi_status acpi_hw_validate_io_block(u64 address, u32 bit_width, u32 count) +{ + acpi_status status; + + while (count--) { + status = acpi_hw_validate_io_request((acpi_io_address)address, + bit_width); + if (ACPI_FAILURE(status)) + return_ACPI_STATUS(status); + + address += ACPI_DIV_8(bit_width); + } + + return_ACPI_STATUS(AE_OK); +} |