diff options
Diffstat (limited to 'drivers/acpi/resources/rslist.c')
| -rw-r--r-- | drivers/acpi/resources/rslist.c | 290 |
1 files changed, 146 insertions, 144 deletions
diff --git a/drivers/acpi/resources/rslist.c b/drivers/acpi/resources/rslist.c index 87e75349dd0a..f72d42e0927b 100644 --- a/drivers/acpi/resources/rslist.c +++ b/drivers/acpi/resources/rslist.c @@ -47,106 +47,70 @@ #define _COMPONENT ACPI_RESOURCES ACPI_MODULE_NAME("rslist") -/* Dispatch table for convert-to-stream functions */ -typedef -acpi_status(*ACPI_STREAM_HANDLER) (struct acpi_resource * resource, - u8 ** output_buffer, - acpi_size * bytes_consumed); - -static ACPI_STREAM_HANDLER acpi_gbl_stream_dispatch[] = { - acpi_rs_irq_stream, /* ACPI_RSTYPE_IRQ */ - acpi_rs_dma_stream, /* ACPI_RSTYPE_DMA */ - acpi_rs_start_depend_fns_stream, /* ACPI_RSTYPE_START_DPF */ - acpi_rs_end_depend_fns_stream, /* ACPI_RSTYPE_END_DPF */ - acpi_rs_io_stream, /* ACPI_RSTYPE_IO */ - acpi_rs_fixed_io_stream, /* ACPI_RSTYPE_FIXED_IO */ - acpi_rs_vendor_stream, /* ACPI_RSTYPE_VENDOR */ - acpi_rs_end_tag_stream, /* ACPI_RSTYPE_END_TAG */ - acpi_rs_memory24_stream, /* ACPI_RSTYPE_MEM24 */ - acpi_rs_memory32_range_stream, /* ACPI_RSTYPE_MEM32 */ - acpi_rs_fixed_memory32_stream, /* ACPI_RSTYPE_FIXED_MEM32 */ - acpi_rs_address16_stream, /* ACPI_RSTYPE_ADDRESS16 */ - acpi_rs_address32_stream, /* ACPI_RSTYPE_ADDRESS32 */ - acpi_rs_address64_stream, /* ACPI_RSTYPE_ADDRESS64 */ - acpi_rs_extended_irq_stream, /* ACPI_RSTYPE_EXT_IRQ */ - acpi_rs_generic_register_stream /* ACPI_RSTYPE_GENERIC_REG */ -}; - -/* Dispatch tables for convert-to-resource functions */ - -typedef -acpi_status(*ACPI_RESOURCE_HANDLER) (u8 * byte_stream_buffer, - acpi_size * bytes_consumed, - u8 ** output_buffer, - acpi_size * structure_size); - -static ACPI_RESOURCE_HANDLER acpi_gbl_sm_resource_dispatch[] = { - NULL, /* 0x00, Reserved */ - NULL, /* 0x01, Reserved */ - NULL, /* 0x02, Reserved */ - NULL, /* 0x03, Reserved */ - acpi_rs_irq_resource, /* ACPI_RDESC_TYPE_IRQ_FORMAT */ - acpi_rs_dma_resource, /* ACPI_RDESC_TYPE_DMA_FORMAT */ - acpi_rs_start_depend_fns_resource, /* ACPI_RDESC_TYPE_START_DEPENDENT */ - acpi_rs_end_depend_fns_resource, /* ACPI_RDESC_TYPE_END_DEPENDENT */ - acpi_rs_io_resource, /* ACPI_RDESC_TYPE_IO_PORT */ - acpi_rs_fixed_io_resource, /* ACPI_RDESC_TYPE_FIXED_IO_PORT */ - NULL, /* 0x0A, Reserved */ - NULL, /* 0x0B, Reserved */ - NULL, /* 0x0C, Reserved */ - NULL, /* 0x0D, Reserved */ - acpi_rs_vendor_resource, /* ACPI_RDESC_TYPE_SMALL_VENDOR */ - acpi_rs_end_tag_resource /* ACPI_RDESC_TYPE_END_TAG */ -}; - -static ACPI_RESOURCE_HANDLER acpi_gbl_lg_resource_dispatch[] = { - NULL, /* 0x00, Reserved */ - acpi_rs_memory24_resource, /* ACPI_RDESC_TYPE_MEMORY_24 */ - acpi_rs_generic_register_resource, /* ACPI_RDESC_TYPE_GENERIC_REGISTER */ - NULL, /* 0x03, Reserved */ - acpi_rs_vendor_resource, /* ACPI_RDESC_TYPE_LARGE_VENDOR */ - acpi_rs_memory32_range_resource, /* ACPI_RDESC_TYPE_MEMORY_32 */ - acpi_rs_fixed_memory32_resource, /* ACPI_RDESC_TYPE_FIXED_MEMORY_32 */ - acpi_rs_address32_resource, /* ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE */ - acpi_rs_address16_resource, /* ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE */ - acpi_rs_extended_irq_resource, /* ACPI_RDESC_TYPE_EXTENDED_XRUPT */ - acpi_rs_address64_resource, /* ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE */ - acpi_rs_address64_resource /* ACPI_RDESC_TYPE_EXTENDED_ADDRESS_SPACE */ -}; - /* Local prototypes */ +static ACPI_GET_RESOURCE_HANDLER acpi_rs_get_resource_handler(u8 resource_type); -static ACPI_RESOURCE_HANDLER acpi_rs_get_resource_handler(u8 resource_type); +static acpi_status acpi_rs_validate_resource_length(union aml_resource *aml); /******************************************************************************* * - * FUNCTION: acpi_rs_get_resource_type + * FUNCTION: acpi_rs_validate_resource_length * - * PARAMETERS: resource_type - Byte 0 of a resource descriptor + * PARAMETERS: Aml - Pointer to the AML resource descriptor * - * RETURN: The Resource Type with no extraneous bits (except the large/ - * small bit -- left alone) + * RETURN: Status - AE_OK if the resource length appears valid * - * DESCRIPTION: Extract the Resource Type/Name from the first byte of - * a resource descriptor. + * DESCRIPTION: Validate the resource_length. Fixed-length descriptors must + * have the exact length; variable-length descriptors must be + * at least as long as the minimum. Certain Small descriptors + * can vary in size by at most one byte. * ******************************************************************************/ -u8 acpi_rs_get_resource_type(u8 resource_type) +static acpi_status acpi_rs_validate_resource_length(union aml_resource *aml) { + struct acpi_resource_info *resource_info; + u16 minimum_aml_resource_length; + u16 resource_length; + ACPI_FUNCTION_ENTRY(); - /* Determine if this is a small or large resource */ + /* Get the size and type info about this resource descriptor */ - if (resource_type & ACPI_RDESC_TYPE_LARGE) { - /* Large Resource Type -- bits 6:0 contain the name */ + resource_info = + acpi_rs_get_resource_info(aml->small_header.descriptor_type); + if (!resource_info) { + return (AE_AML_INVALID_RESOURCE_TYPE); + } + + resource_length = acpi_rs_get_resource_length(aml); + minimum_aml_resource_length = + resource_info->minimum_aml_resource_length; + + /* Validate based upon the type of resource, fixed length or variable */ + + if (resource_info->length_type == ACPI_FIXED_LENGTH) { + /* Fixed length resource, length must match exactly */ - return (resource_type); + if (resource_length != minimum_aml_resource_length) { + return (AE_AML_BAD_RESOURCE_LENGTH); + } + } else if (resource_info->length_type == ACPI_VARIABLE_LENGTH) { + /* Variable length resource, must be at least the minimum */ + + if (resource_length < minimum_aml_resource_length) { + return (AE_AML_BAD_RESOURCE_LENGTH); + } } else { - /* Small Resource Type -- bits 6:3 contain the name */ + /* Small variable length resource, allowed to be (Min) or (Min-1) */ - return ((u8) (resource_type & ACPI_RDESC_SMALL_MASK)); + if ((resource_length > minimum_aml_resource_length) || + (resource_length < (minimum_aml_resource_length - 1))) { + return (AE_AML_BAD_RESOURCE_LENGTH); + } } + + return (AE_OK); } /******************************************************************************* @@ -162,38 +126,38 @@ u8 acpi_rs_get_resource_type(u8 resource_type) * ******************************************************************************/ -static ACPI_RESOURCE_HANDLER acpi_rs_get_resource_handler(u8 resource_type) +static ACPI_GET_RESOURCE_HANDLER acpi_rs_get_resource_handler(u8 resource_type) { ACPI_FUNCTION_ENTRY(); /* Determine if this is a small or large resource */ - if (resource_type & ACPI_RDESC_TYPE_LARGE) { + if (resource_type & ACPI_RESOURCE_NAME_LARGE) { /* Large Resource Type -- bits 6:0 contain the name */ - if (resource_type > ACPI_RDESC_LARGE_MAX) { + if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) { return (NULL); } - return (acpi_gbl_lg_resource_dispatch[(resource_type & - ACPI_RDESC_LARGE_MASK)]); + return (acpi_gbl_lg_get_resource_dispatch[(resource_type & + ACPI_RESOURCE_NAME_LARGE_MASK)]); } else { /* Small Resource Type -- bits 6:3 contain the name */ - return (acpi_gbl_sm_resource_dispatch[((resource_type & - ACPI_RDESC_SMALL_MASK) - >> 3)]); + return (acpi_gbl_sm_get_resource_dispatch[((resource_type & + ACPI_RESOURCE_NAME_SMALL_MASK) + >> 3)]); } } /******************************************************************************* * - * FUNCTION: acpi_rs_byte_stream_to_list + * FUNCTION: acpi_rs_convert_aml_to_resources * - * PARAMETERS: byte_stream_buffer - Pointer to the resource byte stream - * byte_stream_buffer_length - Length of byte_stream_buffer - * output_buffer - Pointer to the buffer that will - * contain the output structures + * PARAMETERS: aml_buffer - Pointer to the resource byte stream + * aml_buffer_length - Length of aml_buffer + * output_buffer - Pointer to the buffer that will + * contain the output structures * * RETURN: Status * @@ -203,37 +167,60 @@ static ACPI_RESOURCE_HANDLER acpi_rs_get_resource_handler(u8 resource_type) ******************************************************************************/ acpi_status -acpi_rs_byte_stream_to_list(u8 * byte_stream_buffer, - u32 byte_stream_buffer_length, u8 * output_buffer) +acpi_rs_convert_aml_to_resources(u8 * aml_buffer, + u32 aml_buffer_length, u8 * output_buffer) { u8 *buffer = output_buffer; acpi_status status; acpi_size bytes_parsed = 0; - acpi_size bytes_consumed = 0; - acpi_size structure_size = 0; struct acpi_resource *resource; - ACPI_RESOURCE_HANDLER handler; + u16 resource_length; + u32 descriptor_length; + ACPI_GET_RESOURCE_HANDLER handler; - ACPI_FUNCTION_TRACE("rs_byte_stream_to_list"); + ACPI_FUNCTION_TRACE("rs_convert_aml_to_resources"); /* Loop until end-of-buffer or an end_tag is found */ - while (bytes_parsed < byte_stream_buffer_length) { + while (bytes_parsed < aml_buffer_length) { /* Get the handler associated with this Descriptor Type */ - handler = acpi_rs_get_resource_handler(*byte_stream_buffer); - if (handler) { - /* Convert a byte stream resource to local resource struct */ + handler = acpi_rs_get_resource_handler(*aml_buffer); + if (!handler) { + /* No handler indicates invalid resource type */ - status = handler(byte_stream_buffer, &bytes_consumed, - &buffer, &structure_size); - } else { - /* Invalid resource type */ + return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); + } - status = AE_AML_INVALID_RESOURCE_TYPE; + resource_length = + acpi_rs_get_resource_length(ACPI_CAST_PTR + (union aml_resource, + aml_buffer)); + + descriptor_length = + acpi_rs_get_descriptor_length(ACPI_CAST_PTR + (union aml_resource, + aml_buffer)); + + /* + * Perform limited validation of the resource length, based upon + * what we know about the resource type + */ + status = + acpi_rs_validate_resource_length(ACPI_CAST_PTR + (union aml_resource, + aml_buffer)); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); } + /* Convert a byte stream resource to local resource struct */ + + status = handler(ACPI_CAST_PTR(union aml_resource, aml_buffer), + resource_length, + ACPI_CAST_PTR(struct acpi_resource, buffer)); if (ACPI_FAILURE(status)) { + ACPI_REPORT_ERROR(("Could not convert AML resource (type %X) to resource, %s\n", *aml_buffer, acpi_format_exception(status))); return_ACPI_STATUS(status); } @@ -245,19 +232,19 @@ acpi_rs_byte_stream_to_list(u8 * byte_stream_buffer, /* Normal exit on completion of an end_tag resource descriptor */ - if (acpi_rs_get_resource_type(*byte_stream_buffer) == - ACPI_RDESC_TYPE_END_TAG) { + if (acpi_rs_get_resource_type(*aml_buffer) == + ACPI_RESOURCE_NAME_END_TAG) { return_ACPI_STATUS(AE_OK); } /* Update counter and point to the next input resource */ - bytes_parsed += bytes_consumed; - byte_stream_buffer += bytes_consumed; + bytes_parsed += descriptor_length; + aml_buffer += descriptor_length; /* Point to the next structure in the output buffer */ - buffer += ACPI_ALIGN_RESOURCE_SIZE(structure_size); + buffer += resource->length; } /* Completed buffer, but did not find an end_tag resource descriptor */ @@ -267,17 +254,15 @@ acpi_rs_byte_stream_to_list(u8 * byte_stream_buffer, /******************************************************************************* * - * FUNCTION: acpi_rs_list_to_byte_stream + * FUNCTION: acpi_rs_convert_resources_to_aml * - * PARAMETERS: Resource - Pointer to the resource linked list - * byte_steam_size_needed - Calculated size of the byte stream - * needed from calling - * acpi_rs_get_byte_stream_length() - * The size of the output_buffer is - * guaranteed to be >= - * byte_stream_size_needed - * output_buffer - Pointer to the buffer that will - * contain the byte stream + * PARAMETERS: Resource - Pointer to the resource linked list + * aml_size_needed - Calculated size of the byte stream + * needed from calling acpi_rs_get_aml_length() + * The size of the output_buffer is + * guaranteed to be >= aml_size_needed + * output_buffer - Pointer to the buffer that will + * contain the byte stream * * RETURN: Status * @@ -287,52 +272,69 @@ acpi_rs_byte_stream_to_list(u8 * byte_stream_buffer, ******************************************************************************/ acpi_status -acpi_rs_list_to_byte_stream(struct acpi_resource *resource, - acpi_size byte_stream_size_needed, - u8 * output_buffer) +acpi_rs_convert_resources_to_aml(struct acpi_resource *resource, + acpi_size aml_size_needed, u8 * output_buffer) { - u8 *buffer = output_buffer; - acpi_size bytes_consumed = 0; + u8 *aml_buffer = output_buffer; acpi_status status; - ACPI_FUNCTION_TRACE("rs_list_to_byte_stream"); + ACPI_FUNCTION_TRACE("rs_convert_resources_to_aml"); /* Convert each resource descriptor in the list */ while (1) { - /* Validate Type before dispatch */ + /* Validate Resource Descriptor Type before dispatch */ - if (resource->type > ACPI_RSTYPE_MAX) { + if (resource->type > ACPI_RESOURCE_TYPE_MAX) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid descriptor type (%X) in resource list\n", resource->type)); return_ACPI_STATUS(AE_BAD_DATA); } - /* Perform the conversion, per resource type */ + /* Perform the conversion per resource type */ + + status = + acpi_gbl_set_resource_dispatch[resource->type] (resource, + ACPI_CAST_PTR + (union + aml_resource, + aml_buffer)); + if (ACPI_FAILURE(status)) { + ACPI_REPORT_ERROR(("Could not convert resource (type %X) to AML, %s\n", resource->type, acpi_format_exception(status))); + return_ACPI_STATUS(status); + } + + /* Perform final sanity check on the new AML resource descriptor */ - status = acpi_gbl_stream_dispatch[resource->type] (resource, - &buffer, - &bytes_consumed); + status = + acpi_rs_validate_resource_length(ACPI_CAST_PTR + (union aml_resource, + aml_buffer)); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } - /* Check for end-of-list */ + /* Check for end-of-list, normal exit */ - if (resource->type == ACPI_RSTYPE_END_TAG) { - /* An End Tag indicates the end of the Resource Template */ + if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) { + /* An End Tag indicates the end of the input Resource Template */ return_ACPI_STATUS(AE_OK); } - /* Set the Buffer to point to the next (output) resource descriptor */ + /* Extract the total length of the new descriptor */ + /* Set the aml_buffer to point to the next (output) resource descriptor */ - buffer += bytes_consumed; + aml_buffer += + acpi_rs_get_descriptor_length(ACPI_CAST_PTR + (union aml_resource, + aml_buffer)); - /* Point to the next input resource object */ + /* Point to the next input resource descriptor */ - resource = ACPI_PTR_ADD(struct acpi_resource, - resource, resource->length); + resource = + ACPI_PTR_ADD(struct acpi_resource, resource, + resource->length); } } |
