diff options
Diffstat (limited to 'drivers/acpi/acpica/hwvalid.c')
| -rw-r--r-- | drivers/acpi/acpica/hwvalid.c | 85 |
1 files changed, 71 insertions, 14 deletions
diff --git a/drivers/acpi/acpica/hwvalid.c b/drivers/acpi/acpica/hwvalid.c index bd3c937b0ac..ec33f270c5b 100644 --- a/drivers/acpi/acpica/hwvalid.c +++ b/drivers/acpi/acpica/hwvalid.c @@ -152,7 +152,7 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width) ACPI_ERROR((AE_INFO, "Illegal I/O port address/length above 64K: 0x%p/%X", ACPI_CAST_PTR(void, address), byte_width)); - return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS); + return_ACPI_STATUS(AE_LIMIT); } /* Exit if requested address is not within the protected port table */ @@ -179,11 +179,12 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width) /* Port illegality may depend on the _OSI calls made by the BIOS */ if (acpi_gbl_osi_data >= port_info->osi_dependency) { - ACPI_ERROR((AE_INFO, - "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)", - ACPI_CAST_PTR(void, address), - byte_width, port_info->name, - port_info->start, port_info->end)); + ACPI_DEBUG_PRINT((ACPI_DB_IO, + "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)", + ACPI_CAST_PTR(void, address), + byte_width, port_info->name, + port_info->start, + port_info->end)); return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS); } @@ -207,7 +208,7 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width) * Value Where value is placed * Width Number of bits * - * RETURN: Value read from port + * 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 @@ -218,14 +219,43 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width) acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width) { acpi_status status; + u32 one_byte; + u32 i; + + /* Validate the entire request and perform the I/O */ status = acpi_hw_validate_io_request(address, width); - if (ACPI_FAILURE(status)) { + if (ACPI_SUCCESS(status)) { + status = acpi_os_read_port(address, value, width); return 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 Windows compatibility. + */ + 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; } /****************************************************************************** @@ -236,7 +266,7 @@ acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width) * Value Value to write * Width Number of bits * - * RETURN: None + * 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 @@ -247,12 +277,39 @@ acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width) acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width) { acpi_status status; + u32 i; + + /* Validate the entire request and perform the I/O */ status = acpi_hw_validate_io_request(address, width); - if (ACPI_FAILURE(status)) { + if (ACPI_SUCCESS(status)) { + status = acpi_os_write_port(address, value, width); return 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 Windows compatibility. + */ + 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; } |