diff options
| -rw-r--r-- | drivers/acpi/acpica/Makefile | 1 | ||||
| -rw-r--r-- | drivers/acpi/acpica/acinterp.h | 20 | ||||
| -rw-r--r-- | drivers/acpi/acpica/exfield.c | 364 | ||||
| -rw-r--r-- | drivers/acpi/acpica/exserial.c | 360 |
4 files changed, 381 insertions, 364 deletions
diff --git a/drivers/acpi/acpica/Makefile b/drivers/acpi/acpica/Makefile index 71f6f2624deb..b14621da5413 100644 --- a/drivers/acpi/acpica/Makefile +++ b/drivers/acpi/acpica/Makefile @@ -65,6 +65,7 @@ acpi-y += \ exresnte.o \ exresolv.o \ exresop.o \ + exserial.o \ exstore.o \ exstoren.o \ exstorob.o \ diff --git a/drivers/acpi/acpica/acinterp.h b/drivers/acpi/acpica/acinterp.h index 6a53d3bd99c0..c5b2be0b6613 100644 --- a/drivers/acpi/acpica/acinterp.h +++ b/drivers/acpi/acpica/acinterp.h @@ -271,6 +271,26 @@ acpi_ex_prep_common_field_object(union acpi_operand_object *obj_desc, acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info); /* + * exserial - field_unit support for serial address spaces + */ +acpi_status +acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc, + union acpi_operand_object **return_buffer); + +acpi_status +acpi_ex_write_serial_bus(union acpi_operand_object *source_desc, + union acpi_operand_object *obj_desc, + union acpi_operand_object **return_buffer); + +acpi_status +acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer); + +acpi_status +acpi_ex_write_gpio(union acpi_operand_object *source_desc, + union acpi_operand_object *obj_desc, + union acpi_operand_object **return_buffer); + +/* * exsystem - Interface to OS services */ acpi_status diff --git a/drivers/acpi/acpica/exfield.c b/drivers/acpi/acpica/exfield.c index f3e5e988e219..e5798f15793a 100644 --- a/drivers/acpi/acpica/exfield.c +++ b/drivers/acpi/acpica/exfield.c @@ -16,31 +16,12 @@ #define _COMPONENT ACPI_EXECUTER ACPI_MODULE_NAME("exfield") -/* Local prototypes */ -static acpi_status -acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc, - union acpi_operand_object **return_buffer); - -static acpi_status -acpi_ex_write_serial_bus(union acpi_operand_object *source_desc, - union acpi_operand_object *obj_desc, - union acpi_operand_object **return_buffer); - -static acpi_status -acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer); - -static acpi_status -acpi_ex_write_gpio(union acpi_operand_object *source_desc, - union acpi_operand_object *obj_desc, - union acpi_operand_object **return_buffer); - /* * This table maps the various Attrib protocols to the byte transfer * length. Used for the generic serial bus. */ #define ACPI_INVALID_PROTOCOL_ID 0x80 #define ACPI_MAX_PROTOCOL_ID 0x0F - const u8 acpi_protocol_lengths[] = { ACPI_INVALID_PROTOCOL_ID, /* 0 - reserved */ ACPI_INVALID_PROTOCOL_ID, /* 1 - reserved */ @@ -343,348 +324,3 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc, acpi_ex_release_global_lock(obj_desc->common_field.field_flags); return_ACPI_STATUS(status); } - -/******************************************************************************* - * - * FUNCTION: acpi_ex_read_gpio - * - * PARAMETERS: obj_desc - The named field to read - * buffer - Where the return data is returnd - * - * RETURN: Status - * - * DESCRIPTION: Read from a named field that references a Generic Serial Bus - * field - * - ******************************************************************************/ - -static acpi_status -acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer) -{ - acpi_status status; - - ACPI_FUNCTION_TRACE_PTR(ex_read_gpio, obj_desc); - - /* - * For GPIO (general_purpose_io), the Address will be the bit offset - * from the previous Connection() operator, making it effectively a - * pin number index. The bit_length is the length of the field, which - * is thus the number of pins. - */ - ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, - "GPIO FieldRead [FROM]: Pin %u Bits %u\n", - obj_desc->field.pin_number_index, - obj_desc->field.bit_length)); - - /* Lock entire transaction if requested */ - - acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); - - /* Perform the read */ - - status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_READ); - - acpi_ex_release_global_lock(obj_desc->common_field.field_flags); - return_ACPI_STATUS(status); -} - -/******************************************************************************* - * - * FUNCTION: acpi_ex_write_gpio - * - * PARAMETERS: source_desc - Contains data to write. Expect to be - * an Integer object. - * obj_desc - The named field - * result_desc - Where the return value is returned, if any - * - * RETURN: Status - * - * DESCRIPTION: Write to a named field that references a General Purpose I/O - * field. - * - ******************************************************************************/ - -static acpi_status -acpi_ex_write_gpio(union acpi_operand_object *source_desc, - union acpi_operand_object *obj_desc, - union acpi_operand_object **return_buffer) -{ - acpi_status status; - void *buffer; - - ACPI_FUNCTION_TRACE_PTR(ex_write_gpio, obj_desc); - - /* - * For GPIO (general_purpose_io), we will bypass the entire field - * mechanism and handoff the bit address and bit width directly to - * the handler. The Address will be the bit offset - * from the previous Connection() operator, making it effectively a - * pin number index. The bit_length is the length of the field, which - * is thus the number of pins. - */ - if (source_desc->common.type != ACPI_TYPE_INTEGER) { - return_ACPI_STATUS(AE_AML_OPERAND_TYPE); - } - - ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, - "GPIO FieldWrite [FROM]: (%s:%X), Value %.8X [TO]: Pin %u Bits %u\n", - acpi_ut_get_type_name(source_desc->common.type), - source_desc->common.type, - (u32)source_desc->integer.value, - obj_desc->field.pin_number_index, - obj_desc->field.bit_length)); - - buffer = &source_desc->integer.value; - - /* Lock entire transaction if requested */ - - acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); - - /* Perform the write */ - - status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_WRITE); - acpi_ex_release_global_lock(obj_desc->common_field.field_flags); - return_ACPI_STATUS(status); -} - -/******************************************************************************* - * - * FUNCTION: acpi_ex_read_serial_bus - * - * PARAMETERS: obj_desc - The named field to read - * return_buffer - Where the return value is returned, if any - * - * RETURN: Status - * - * DESCRIPTION: Read from a named field that references a serial bus - * (SMBus, IPMI, or GSBus). - * - ******************************************************************************/ - -static acpi_status -acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc, - union acpi_operand_object **return_buffer) -{ - acpi_status status; - u32 buffer_length; - union acpi_operand_object *buffer_desc; - u32 function; - u16 accessor_type; - - ACPI_FUNCTION_TRACE_PTR(ex_read_serial_bus, obj_desc); - - /* - * This is an SMBus, GSBus or IPMI read. We must create a buffer to - * hold the data and then directly access the region handler. - * - * Note: SMBus and GSBus protocol value is passed in upper 16-bits - * of Function - * - * Common buffer format: - * Status; (Byte 0 of the data buffer) - * Length; (Byte 1 of the data buffer) - * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer) - */ - switch (obj_desc->field.region_obj->region.space_id) { - case ACPI_ADR_SPACE_SMBUS: - - buffer_length = ACPI_SMBUS_BUFFER_SIZE; - function = ACPI_READ | (obj_desc->field.attribute << 16); - break; - - case ACPI_ADR_SPACE_IPMI: - - buffer_length = ACPI_IPMI_BUFFER_SIZE; - function = ACPI_READ; - break; - - case ACPI_ADR_SPACE_GSBUS: - - accessor_type = obj_desc->field.attribute; - if (accessor_type == AML_FIELD_ATTRIB_RAW_PROCESS_BYTES) { - ACPI_ERROR((AE_INFO, - "Invalid direct read using bidirectional write-then-read protocol")); - - return_ACPI_STATUS(AE_AML_PROTOCOL); - } - - status = - acpi_ex_get_protocol_buffer_length(accessor_type, - &buffer_length); - if (ACPI_FAILURE(status)) { - ACPI_ERROR((AE_INFO, - "Invalid protocol ID for GSBus: 0x%4.4X", - accessor_type)); - - return_ACPI_STATUS(status); - } - - /* Add header length to get the full size of the buffer */ - - buffer_length += ACPI_SERIAL_HEADER_SIZE; - function = ACPI_READ | (accessor_type << 16); - break; - - default: - return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID); - } - - /* Create the local transfer buffer that is returned to the caller */ - - buffer_desc = acpi_ut_create_buffer_object(buffer_length); - if (!buffer_desc) { - return_ACPI_STATUS(AE_NO_MEMORY); - } - - /* Lock entire transaction if requested */ - - acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); - - /* Call the region handler for the write-then-read */ - - status = acpi_ex_access_region(obj_desc, 0, - ACPI_CAST_PTR(u64, - buffer_desc->buffer. - pointer), function); - acpi_ex_release_global_lock(obj_desc->common_field.field_flags); - - *return_buffer = buffer_desc; - return_ACPI_STATUS(status); -} - -/******************************************************************************* - * - * FUNCTION: acpi_ex_write_serial_bus - * - * PARAMETERS: source_desc - Contains data to write - * obj_desc - The named field - * return_buffer - Where the return value is returned, if any - * - * RETURN: Status - * - * DESCRIPTION: Write to a named field that references a serial bus - * (SMBus, IPMI, GSBus). - * - ******************************************************************************/ - -static acpi_status -acpi_ex_write_serial_bus(union acpi_operand_object *source_desc, - union acpi_operand_object *obj_desc, - union acpi_operand_object **return_buffer) -{ - acpi_status status; - u32 buffer_length; - u32 data_length; - void *buffer; - union acpi_operand_object *buffer_desc; - u32 function; - u16 accessor_type; - - ACPI_FUNCTION_TRACE_PTR(ex_write_serial_bus, obj_desc); - - /* - * This is an SMBus, GSBus or IPMI write. We will bypass the entire - * field mechanism and handoff the buffer directly to the handler. - * For these address spaces, the buffer is bidirectional; on a - * write, return data is returned in the same buffer. - * - * Source must be a buffer of sufficient size, these are fixed size: - * ACPI_SMBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE. - * - * Note: SMBus and GSBus protocol type is passed in upper 16-bits - * of Function - * - * Common buffer format: - * Status; (Byte 0 of the data buffer) - * Length; (Byte 1 of the data buffer) - * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer) - */ - if (source_desc->common.type != ACPI_TYPE_BUFFER) { - ACPI_ERROR((AE_INFO, - "SMBus/IPMI/GenericSerialBus write requires " - "Buffer, found type %s", - acpi_ut_get_object_type_name(source_desc))); - - return_ACPI_STATUS(AE_AML_OPERAND_TYPE); - } - - switch (obj_desc->field.region_obj->region.space_id) { - case ACPI_ADR_SPACE_SMBUS: - - buffer_length = ACPI_SMBUS_BUFFER_SIZE; - data_length = ACPI_SMBUS_DATA_SIZE; - function = ACPI_WRITE | (obj_desc->field.attribute << 16); - break; - - case ACPI_ADR_SPACE_IPMI: - - buffer_length = ACPI_IPMI_BUFFER_SIZE; - data_length = ACPI_IPMI_DATA_SIZE; - function = ACPI_WRITE; - break; - - case ACPI_ADR_SPACE_GSBUS: - - accessor_type = obj_desc->field.attribute; - status = - acpi_ex_get_protocol_buffer_length(accessor_type, - &buffer_length); - if (ACPI_FAILURE(status)) { - ACPI_ERROR((AE_INFO, - "Invalid protocol ID for GSBus: 0x%4.4X", - accessor_type)); - - return_ACPI_STATUS(status); - } - - /* Add header length to get the full size of the buffer */ - - buffer_length += ACPI_SERIAL_HEADER_SIZE; - data_length = source_desc->buffer.pointer[1]; - function = ACPI_WRITE | (accessor_type << 16); - break; - - default: - return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID); - } - -#if 0 - OBSOLETE ? - /* Check for possible buffer overflow */ - if (data_length > source_desc->buffer.length) { - ACPI_ERROR((AE_INFO, - "Length in buffer header (%u)(%u) is greater than " - "the physical buffer length (%u) and will overflow", - data_length, buffer_length, - source_desc->buffer.length)); - - return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); - } -#endif - - /* Create the transfer/bidirectional/return buffer */ - - buffer_desc = acpi_ut_create_buffer_object(buffer_length); - if (!buffer_desc) { - return_ACPI_STATUS(AE_NO_MEMORY); - } - - /* Copy the input buffer data to the transfer buffer */ - - buffer = buffer_desc->buffer.pointer; - memcpy(buffer, source_desc->buffer.pointer, data_length); - - /* Lock entire transaction if requested */ - - acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); - - /* - * Perform the write (returns status and perhaps data in the - * same buffer) - */ - status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, function); - acpi_ex_release_global_lock(obj_desc->common_field.field_flags); - - *return_buffer = buffer_desc; - return_ACPI_STATUS(status); -} diff --git a/drivers/acpi/acpica/exserial.c b/drivers/acpi/acpica/exserial.c new file mode 100644 index 000000000000..0d42f30e5b25 --- /dev/null +++ b/drivers/acpi/acpica/exserial.c @@ -0,0 +1,360 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: exserial - field_unit support for serial address spaces + * + * Copyright (C) 2000 - 2018, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" +#include "acdispat.h" +#include "acinterp.h" +#include "amlcode.h" + +#define _COMPONENT ACPI_EXECUTER +ACPI_MODULE_NAME("exserial") + +/******************************************************************************* + * + * FUNCTION: acpi_ex_read_gpio + * + * PARAMETERS: obj_desc - The named field to read + * buffer - Where the return data is returnd + * + * RETURN: Status + * + * DESCRIPTION: Read from a named field that references a Generic Serial Bus + * field + * + ******************************************************************************/ +acpi_status acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE_PTR(ex_read_gpio, obj_desc); + + /* + * For GPIO (general_purpose_io), the Address will be the bit offset + * from the previous Connection() operator, making it effectively a + * pin number index. The bit_length is the length of the field, which + * is thus the number of pins. + */ + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "GPIO FieldRead [FROM]: Pin %u Bits %u\n", + obj_desc->field.pin_number_index, + obj_desc->field.bit_length)); + + /* Lock entire transaction if requested */ + + acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); + + /* Perform the read */ + + status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_READ); + + acpi_ex_release_global_lock(obj_desc->common_field.field_flags); + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_write_gpio + * + * PARAMETERS: source_desc - Contains data to write. Expect to be + * an Integer object. + * obj_desc - The named field + * result_desc - Where the return value is returned, if any + * + * RETURN: Status + * + * DESCRIPTION: Write to a named field that references a General Purpose I/O + * field. + * + ******************************************************************************/ + +acpi_status +acpi_ex_write_gpio(union acpi_operand_object *source_desc, + union acpi_operand_object *obj_desc, + union acpi_operand_object **return_buffer) +{ + acpi_status status; + void *buffer; + + ACPI_FUNCTION_TRACE_PTR(ex_write_gpio, obj_desc); + + /* + * For GPIO (general_purpose_io), we will bypass the entire field + * mechanism and handoff the bit address and bit width directly to + * the handler. The Address will be the bit offset + * from the previous Connection() operator, making it effectively a + * pin number index. The bit_length is the length of the field, which + * is thus the number of pins. + */ + if (source_desc->common.type != ACPI_TYPE_INTEGER) { + return_ACPI_STATUS(AE_AML_OPERAND_TYPE); + } + + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "GPIO FieldWrite [FROM]: (%s:%X), Value %.8X [TO]: Pin %u Bits %u\n", + acpi_ut_get_type_name(source_desc->common.type), + source_desc->common.type, + (u32)source_desc->integer.value, + obj_desc->field.pin_number_index, + obj_desc->field.bit_length)); + + buffer = &source_desc->integer.value; + + /* Lock entire transaction if requested */ + + acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); + + /* Perform the write */ + + status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_WRITE); + acpi_ex_release_global_lock(obj_desc->common_field.field_flags); + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_read_serial_bus + * + * PARAMETERS: obj_desc - The named field to read + * return_buffer - Where the return value is returned, if any + * + * RETURN: Status + * + * DESCRIPTION: Read from a named field that references a serial bus + * (SMBus, IPMI, or GSBus). + * + ******************************************************************************/ + +acpi_status +acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc, + union acpi_operand_object **return_buffer) +{ + acpi_status status; + u32 buffer_length; + union acpi_operand_object *buffer_desc; + u32 function; + u16 accessor_type; + + ACPI_FUNCTION_TRACE_PTR(ex_read_serial_bus, obj_desc); + + /* + * This is an SMBus, GSBus or IPMI read. We must create a buffer to + * hold the data and then directly access the region handler. + * + * Note: SMBus and GSBus protocol value is passed in upper 16-bits + * of Function + * + * Common buffer format: + * Status; (Byte 0 of the data buffer) + * Length; (Byte 1 of the data buffer) + * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer) + */ + switch (obj_desc->field.region_obj->region.space_id) { + case ACPI_ADR_SPACE_SMBUS: + + buffer_length = ACPI_SMBUS_BUFFER_SIZE; + function = ACPI_READ | (obj_desc->field.attribute << 16); + break; + + case ACPI_ADR_SPACE_IPMI: + + buffer_length = ACPI_IPMI_BUFFER_SIZE; + function = ACPI_READ; + break; + + case ACPI_ADR_SPACE_GSBUS: + + accessor_type = obj_desc->field.attribute; + if (accessor_type == AML_FIELD_ATTRIB_RAW_PROCESS_BYTES) { + ACPI_ERROR((AE_INFO, + "Invalid direct read using bidirectional write-then-read protocol")); + + return_ACPI_STATUS(AE_AML_PROTOCOL); + } + + status = + acpi_ex_get_protocol_buffer_length(accessor_type, + &buffer_length); + if (ACPI_FAILURE(status)) { + ACPI_ERROR((AE_INFO, + "Invalid protocol ID for GSBus: 0x%4.4X", + accessor_type)); + + return_ACPI_STATUS(status); + } + + /* Add header length to get the full size of the buffer */ + + buffer_length += ACPI_SERIAL_HEADER_SIZE; + function = ACPI_READ | (accessor_type << 16); + break; + + default: + return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID); + } + + /* Create the local transfer buffer that is returned to the caller */ + + buffer_desc = acpi_ut_create_buffer_object(buffer_length); + if (!buffer_desc) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* Lock entire transaction if requested */ + + acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); + + /* Call the region handler for the write-then-read */ + + status = acpi_ex_access_region(obj_desc, 0, + ACPI_CAST_PTR(u64, + buffer_desc->buffer. + pointer), function); + acpi_ex_release_global_lock(obj_desc->common_field.field_flags); + + *return_buffer = buffer_desc; + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_write_serial_bus + * + * PARAMETERS: source_desc - Contains data to write + * obj_desc - The named field + * return_buffer - Where the return value is returned, if any + * + * RETURN: Status + * + * DESCRIPTION: Write to a named field that references a serial bus + * (SMBus, IPMI, GSBus). + * + ******************************************************************************/ + +acpi_status +acpi_ex_write_serial_bus(union acpi_operand_object *source_desc, + union acpi_operand_object *obj_desc, + union acpi_operand_object **return_buffer) +{ + acpi_status status; + u32 buffer_length; + u32 data_length; + void *buffer; + union acpi_operand_object *buffer_desc; + u32 function; + u16 accessor_type; + + ACPI_FUNCTION_TRACE_PTR(ex_write_serial_bus, obj_desc); + + /* + * This is an SMBus, GSBus or IPMI write. We will bypass the entire + * field mechanism and handoff the buffer directly to the handler. + * For these address spaces, the buffer is bidirectional; on a + * write, return data is returned in the same buffer. + * + * Source must be a buffer of sufficient size, these are fixed size: + * ACPI_SMBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE. + * + * Note: SMBus and GSBus protocol type is passed in upper 16-bits + * of Function + * + * Common buffer format: + * Status; (Byte 0 of the data buffer) + * Length; (Byte 1 of the data buffer) + * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer) + */ + if (source_desc->common.type != ACPI_TYPE_BUFFER) { + ACPI_ERROR((AE_INFO, + "SMBus/IPMI/GenericSerialBus write requires " + "Buffer, found type %s", + acpi_ut_get_object_type_name(source_desc))); + + return_ACPI_STATUS(AE_AML_OPERAND_TYPE); + } + + switch (obj_desc->field.region_obj->region.space_id) { + case ACPI_ADR_SPACE_SMBUS: + + buffer_length = ACPI_SMBUS_BUFFER_SIZE; + data_length = ACPI_SMBUS_DATA_SIZE; + function = ACPI_WRITE | (obj_desc->field.attribute << 16); + break; + + case ACPI_ADR_SPACE_IPMI: + + buffer_length = ACPI_IPMI_BUFFER_SIZE; + data_length = ACPI_IPMI_DATA_SIZE; + function = ACPI_WRITE; + break; + + case ACPI_ADR_SPACE_GSBUS: + + accessor_type = obj_desc->field.attribute; + status = + acpi_ex_get_protocol_buffer_length(accessor_type, + &buffer_length); + if (ACPI_FAILURE(status)) { + ACPI_ERROR((AE_INFO, + "Invalid protocol ID for GSBus: 0x%4.4X", + accessor_type)); + + return_ACPI_STATUS(status); + } + + /* Add header length to get the full size of the buffer */ + + buffer_length += ACPI_SERIAL_HEADER_SIZE; + data_length = source_desc->buffer.pointer[1]; + function = ACPI_WRITE | (accessor_type << 16); + break; + + default: + return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID); + } + +#if 0 + OBSOLETE ? + /* Check for possible buffer overflow */ + if (data_length > source_desc->buffer.length) { + ACPI_ERROR((AE_INFO, + "Length in buffer header (%u)(%u) is greater than " + "the physical buffer length (%u) and will overflow", + data_length, buffer_length, + source_desc->buffer.length)); + + return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); + } +#endif + + /* Create the transfer/bidirectional/return buffer */ + + buffer_desc = acpi_ut_create_buffer_object(buffer_length); + if (!buffer_desc) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* Copy the input buffer data to the transfer buffer */ + + buffer = buffer_desc->buffer.pointer; + memcpy(buffer, source_desc->buffer.pointer, data_length); + + /* Lock entire transaction if requested */ + + acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); + + /* + * Perform the write (returns status and perhaps data in the + * same buffer) + */ + status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, function); + acpi_ex_release_global_lock(obj_desc->common_field.field_flags); + + *return_buffer = buffer_desc; + return_ACPI_STATUS(status); +} |