diff options
Diffstat (limited to 'drivers/acpi/resources/rscalc.c')
| -rw-r--r-- | drivers/acpi/resources/rscalc.c | 985 |
1 files changed, 477 insertions, 508 deletions
diff --git a/drivers/acpi/resources/rscalc.c b/drivers/acpi/resources/rscalc.c index 378f58390fc1..cd051c97bf5b 100644 --- a/drivers/acpi/resources/rscalc.c +++ b/drivers/acpi/resources/rscalc.c @@ -44,651 +44,620 @@ #include <acpi/acpi.h> #include <acpi/acresrc.h> #include <acpi/amlcode.h> +#include <acpi/amlresrc.h> #include <acpi/acnamesp.h> #define _COMPONENT ACPI_RESOURCES ACPI_MODULE_NAME("rscalc") +/* + * Base sizes for external resource descriptors, indexed by internal type. + * Includes size of the descriptor header (1 byte for small descriptors, + * 3 bytes for large descriptors) + */ +static u8 acpi_gbl_stream_sizes[] = { + 4, /* ACPI_RSTYPE_IRQ (Byte 3 is optional, but always created) */ + 3, /* ACPI_RSTYPE_DMA */ + 2, /* ACPI_RSTYPE_START_DPF (Byte 1 is optional, but always created) */ + 1, /* ACPI_RSTYPE_END_DPF */ + 8, /* ACPI_RSTYPE_IO */ + 4, /* ACPI_RSTYPE_FIXED_IO */ + 1, /* ACPI_RSTYPE_VENDOR */ + 2, /* ACPI_RSTYPE_END_TAG */ + 12, /* ACPI_RSTYPE_MEM24 */ + 20, /* ACPI_RSTYPE_MEM32 */ + 12, /* ACPI_RSTYPE_FIXED_MEM32 */ + 16, /* ACPI_RSTYPE_ADDRESS16 */ + 26, /* ACPI_RSTYPE_ADDRESS32 */ + 46, /* ACPI_RSTYPE_ADDRESS64 */ + 9, /* ACPI_RSTYPE_EXT_IRQ */ + 15 /* ACPI_RSTYPE_GENERIC_REG */ +}; + +/* + * Base sizes of resource descriptors, both the actual AML stream length and + * size of the internal struct representation. + */ +typedef struct acpi_resource_sizes { + u8 minimum_stream_size; + u8 minimum_struct_size; + +} ACPI_RESOURCE_SIZES; + +static ACPI_RESOURCE_SIZES acpi_gbl_sm_resource_sizes[] = { + 0, 0, /* 0x00, Reserved */ + 0, 0, /* 0x01, Reserved */ + 0, 0, /* 0x02, Reserved */ + 0, 0, /* 0x03, Reserved */ + 3, ACPI_SIZEOF_RESOURCE(struct acpi_resource_irq), /* ACPI_RDESC_TYPE_IRQ_FORMAT */ + 3, ACPI_SIZEOF_RESOURCE(struct acpi_resource_dma), /* ACPI_RDESC_TYPE_DMA_FORMAT */ + 1, ACPI_SIZEOF_RESOURCE(struct acpi_resource_start_dpf), /* ACPI_RDESC_TYPE_START_DEPENDENT */ + 1, ACPI_RESOURCE_LENGTH, /* ACPI_RDESC_TYPE_END_DEPENDENT */ + 8, ACPI_SIZEOF_RESOURCE(struct acpi_resource_io), /* ACPI_RDESC_TYPE_IO_PORT */ + 4, ACPI_SIZEOF_RESOURCE(struct acpi_resource_fixed_io), /* ACPI_RDESC_TYPE_FIXED_IO_PORT */ + 0, 0, /* 0x0A, Reserved */ + 0, 0, /* 0x0B, Reserved */ + 0, 0, /* 0x0C, Reserved */ + 0, 0, /* 0x0D, Reserved */ + 1, ACPI_SIZEOF_RESOURCE(struct acpi_resource_vendor), /* ACPI_RDESC_TYPE_SMALL_VENDOR */ + 2, ACPI_RESOURCE_LENGTH, /* ACPI_RDESC_TYPE_END_TAG */ +}; + +static ACPI_RESOURCE_SIZES acpi_gbl_lg_resource_sizes[] = { + 0, 0, /* 0x00, Reserved */ + 12, ACPI_SIZEOF_RESOURCE(struct acpi_resource_mem24), /* ACPI_RDESC_TYPE_MEMORY_24 */ + 15, ACPI_SIZEOF_RESOURCE(struct acpi_resource_generic_reg), /* ACPI_RDESC_TYPE_GENERIC_REGISTER */ + 0, 0, /* 0x03, Reserved */ + 3, ACPI_SIZEOF_RESOURCE(struct acpi_resource_vendor), /* ACPI_RDESC_TYPE_LARGE_VENDOR */ + 20, ACPI_SIZEOF_RESOURCE(struct acpi_resource_mem32), /* ACPI_RDESC_TYPE_MEMORY_32 */ + 12, ACPI_SIZEOF_RESOURCE(struct acpi_resource_fixed_mem32), /* ACPI_RDESC_TYPE_FIXED_MEMORY_32 */ + 26, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address32), /* ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE */ + 16, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address16), /* ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE */ + 9, ACPI_SIZEOF_RESOURCE(struct acpi_resource_ext_irq), /* ACPI_RDESC_TYPE_EXTENDED_XRUPT */ + 46, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address64), /* ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE */ + 56, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address64), /* ACPI_RDESC_TYPE_EXTENDED_ADDRESS_SPACE */ +}; + +/* Local prototypes */ + +static u8 acpi_rs_count_set_bits(u16 bit_field); + +static ACPI_RESOURCE_SIZES *acpi_rs_get_resource_sizes(u8 resource_type); + +static u16 acpi_rs_get_resource_length(u8 * resource); + +static acpi_size +acpi_rs_struct_option_length(struct acpi_resource_source *resource_source); + +static u32 +acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length); + /******************************************************************************* * - * FUNCTION: acpi_rs_get_byte_stream_length + * FUNCTION: acpi_rs_count_set_bits * - * PARAMETERS: linked_list - Pointer to the resource linked list - * size_needed - u32 pointer of the size buffer needed - * to properly return the parsed data + * PARAMETERS: bit_field - Field in which to count bits * - * RETURN: Status + * RETURN: Number of bits set within the field * - * DESCRIPTION: Takes the resource byte stream and parses it once, calculating - * the size buffer needed to hold the linked list that conveys - * the resource data. + * DESCRIPTION: Count the number of bits set in a resource field. Used for + * (Short descriptor) interrupt and DMA lists. * ******************************************************************************/ -acpi_status -acpi_rs_get_byte_stream_length(struct acpi_resource *linked_list, - acpi_size * size_needed) -{ - acpi_size byte_stream_size_needed = 0; - acpi_size segment_size; - u8 done = FALSE; - - ACPI_FUNCTION_TRACE("rs_get_byte_stream_length"); - while (!done) { - /* Init the variable that will hold the size to add to the total. */ +static u8 acpi_rs_count_set_bits(u16 bit_field) +{ + u8 bits_set; - segment_size = 0; + ACPI_FUNCTION_ENTRY(); - switch (linked_list->id) { - case ACPI_RSTYPE_IRQ: - /* - * IRQ Resource - * For an IRQ Resource, Byte 3, although optional, will always be - * created - it holds IRQ information. - */ - segment_size = 4; - break; + for (bits_set = 0; bit_field; bits_set++) { + /* Zero the least significant bit that is set */ - case ACPI_RSTYPE_DMA: - /* - * DMA Resource - * For this resource the size is static - */ - segment_size = 3; - break; - - case ACPI_RSTYPE_START_DPF: - /* - * Start Dependent Functions Resource - * For a start_dependent_functions Resource, Byte 1, although - * optional, will always be created. - */ - segment_size = 2; - break; + bit_field &= (bit_field - 1); + } - case ACPI_RSTYPE_END_DPF: - /* - * End Dependent Functions Resource - * For this resource the size is static - */ - segment_size = 1; - break; + return (bits_set); +} - case ACPI_RSTYPE_IO: - /* - * IO Port Resource - * For this resource the size is static - */ - segment_size = 8; - break; +/******************************************************************************* + * + * FUNCTION: acpi_rs_get_resource_sizes + * + * PARAMETERS: resource_type - Byte 0 of a resource descriptor + * + * RETURN: Pointer to the resource conversion handler + * + * DESCRIPTION: Extract the Resource Type/Name from the first byte of + * a resource descriptor. + * + ******************************************************************************/ - case ACPI_RSTYPE_FIXED_IO: - /* - * Fixed IO Port Resource - * For this resource the size is static - */ - segment_size = 4; - break; +static ACPI_RESOURCE_SIZES *acpi_rs_get_resource_sizes(u8 resource_type) +{ + ACPI_RESOURCE_SIZES *size_info; - case ACPI_RSTYPE_VENDOR: - /* - * Vendor Defined Resource - * For a Vendor Specific resource, if the Length is between 1 and 7 - * it will be created as a Small Resource data type, otherwise it - * is a Large Resource data type. - */ - if (linked_list->data.vendor_specific.length > 7) { - segment_size = 3; - } else { - segment_size = 1; - } - segment_size += - linked_list->data.vendor_specific.length; - break; + ACPI_FUNCTION_ENTRY(); - case ACPI_RSTYPE_END_TAG: - /* - * End Tag - * For this resource the size is static - */ - segment_size = 2; - done = TRUE; - break; + /* Determine if this is a small or large resource */ - case ACPI_RSTYPE_MEM24: - /* - * 24-Bit Memory Resource - * For this resource the size is static - */ - segment_size = 12; - break; + if (resource_type & ACPI_RDESC_TYPE_LARGE) { + /* Large Resource Type -- bits 6:0 contain the name */ - case ACPI_RSTYPE_MEM32: - /* - * 32-Bit Memory Range Resource - * For this resource the size is static - */ - segment_size = 20; - break; + if (resource_type > ACPI_RDESC_LARGE_MAX) { + return (NULL); + } - case ACPI_RSTYPE_FIXED_MEM32: - /* - * 32-Bit Fixed Memory Resource - * For this resource the size is static - */ - segment_size = 12; - break; + size_info = &acpi_gbl_lg_resource_sizes[(resource_type & + ACPI_RDESC_LARGE_MASK)]; + } else { + /* Small Resource Type -- bits 6:3 contain the name */ - case ACPI_RSTYPE_ADDRESS16: - /* - * 16-Bit Address Resource - * The base size of this byte stream is 16. If a Resource Source - * string is not NULL, add 1 for the Index + the length of the null - * terminated string Resource Source + 1 for the null. - */ - segment_size = 16; - - if (linked_list->data.address16.resource_source. - string_ptr) { - segment_size += - linked_list->data.address16.resource_source. - string_length; - segment_size++; - } - break; + size_info = &acpi_gbl_sm_resource_sizes[((resource_type & + ACPI_RDESC_SMALL_MASK) + >> 3)]; + } - case ACPI_RSTYPE_ADDRESS32: - /* - * 32-Bit Address Resource - * The base size of this byte stream is 26. If a Resource - * Source string is not NULL, add 1 for the Index + the - * length of the null terminated string Resource Source + - * 1 for the null. - */ - segment_size = 26; - - if (linked_list->data.address32.resource_source. - string_ptr) { - segment_size += - linked_list->data.address32.resource_source. - string_length; - segment_size++; - } - break; + /* Zero entry indicates an invalid resource type */ - case ACPI_RSTYPE_ADDRESS64: - /* - * 64-Bit Address Resource - * The base size of this byte stream is 46. If a resource_source - * string is not NULL, add 1 for the Index + the length of the null - * terminated string Resource Source + 1 for the null. - */ - segment_size = 46; - - if (linked_list->data.address64.resource_source. - string_ptr) { - segment_size += - linked_list->data.address64.resource_source. - string_length; - segment_size++; - } - break; + if (!size_info->minimum_stream_size) { + return (NULL); + } - case ACPI_RSTYPE_EXT_IRQ: - /* - * Extended IRQ Resource - * The base size of this byte stream is 9. This is for an Interrupt - * table length of 1. For each additional interrupt, add 4. - * If a Resource Source string is not NULL, add 1 for the - * Index + the length of the null terminated string - * Resource Source + 1 for the null. - */ - segment_size = 9 + (((acpi_size) - linked_list->data.extended_irq. - number_of_interrupts - 1) * 4); - - if (linked_list->data.extended_irq.resource_source. - string_ptr) { - segment_size += - linked_list->data.extended_irq. - resource_source.string_length; - segment_size++; - } - break; + return (size_info); +} - default: +/******************************************************************************* + * + * FUNCTION: acpi_rs_get_resource_length + * + * PARAMETERS: Resource - Pointer to the resource descriptor + * + * RETURN: Byte length of the (AML byte stream) descriptor. By definition, + * this does not include the size of the descriptor header and the + * length field itself. + * + * DESCRIPTION: Extract the length of a resource descriptor. + * + ******************************************************************************/ - /* If we get here, everything is out of sync, exit with error */ +static u16 acpi_rs_get_resource_length(u8 * resource) +{ + u16 resource_length; - return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); + ACPI_FUNCTION_ENTRY(); - } /* switch (linked_list->Id) */ + /* Determine if this is a small or large resource */ - /* Update the total */ + if (*resource & ACPI_RDESC_TYPE_LARGE) { + /* Large Resource type -- length is in bytes 1-2 */ - byte_stream_size_needed += segment_size; + ACPI_MOVE_16_TO_16(&resource_length, (resource + 1)); - /* Point to the next object */ + } else { + /* Small Resource Type -- bits 2:0 of byte 0 contain the length */ - linked_list = ACPI_PTR_ADD(struct acpi_resource, - linked_list, linked_list->length); + resource_length = + (u16) (*resource & ACPI_RDESC_SMALL_LENGTH_MASK); } - /* This is the data the caller needs */ - - *size_needed = byte_stream_size_needed; - return_ACPI_STATUS(AE_OK); + return (resource_length); } /******************************************************************************* * - * FUNCTION: acpi_rs_get_list_length + * FUNCTION: acpi_rs_struct_option_length * - * PARAMETERS: byte_stream_buffer - Pointer to the resource byte stream - * byte_stream_buffer_length - Size of byte_stream_buffer - * size_needed - u32 pointer of the size buffer - * needed to properly return the - * parsed data + * PARAMETERS: resource_source - Pointer to optional descriptor field * * RETURN: Status * - * DESCRIPTION: Takes the resource byte stream and parses it once, calculating - * the size buffer needed to hold the linked list that conveys - * the resource data. + * DESCRIPTION: Common code to handle optional resource_source_index and + * resource_source fields in some Large descriptors. Used during + * list-to-stream conversion * ******************************************************************************/ -acpi_status -acpi_rs_get_list_length(u8 * byte_stream_buffer, - u32 byte_stream_buffer_length, acpi_size * size_needed) +static acpi_size +acpi_rs_struct_option_length(struct acpi_resource_source *resource_source) { - u32 buffer_size = 0; - u32 bytes_parsed = 0; - u8 number_of_interrupts = 0; - u8 number_of_channels = 0; - u8 resource_type; - u32 structure_size; - u32 bytes_consumed; - u8 *buffer; - u8 temp8; - u16 temp16; - u8 index; - u8 additional_bytes; - - ACPI_FUNCTION_TRACE("rs_get_list_length"); - - while (bytes_parsed < byte_stream_buffer_length) { - /* The next byte in the stream is the resource type */ - - resource_type = acpi_rs_get_resource_type(*byte_stream_buffer); + ACPI_FUNCTION_ENTRY(); - switch (resource_type) { - case ACPI_RDESC_TYPE_MEMORY_24: - /* - * 24-Bit Memory Resource - */ - bytes_consumed = 12; - - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_mem24); - break; + /* + * If the resource_source string is valid, return the size of the string + * (string_length includes the NULL terminator) plus the size of the + * resource_source_index (1). + */ + if (resource_source->string_ptr) { + return ((acpi_size) resource_source->string_length + 1); + } - case ACPI_RDESC_TYPE_LARGE_VENDOR: - /* - * Vendor Defined Resource - */ - buffer = byte_stream_buffer; - ++buffer; + return (0); +} - ACPI_MOVE_16_TO_16(&temp16, buffer); - bytes_consumed = temp16 + 3; +/******************************************************************************* + * + * FUNCTION: acpi_rs_stream_option_length + * + * PARAMETERS: resource_length - Length from the resource header + * minimum_total_length - Minimum length of this resource, before + * any optional fields. Includes header size + * + * RETURN: Length of optional string (0 if no string present) + * + * DESCRIPTION: Common code to handle optional resource_source_index and + * resource_source fields in some Large descriptors. Used during + * stream-to-list conversion + * + ******************************************************************************/ - /* Ensure a 32-bit boundary for the structure */ +static u32 +acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length) +{ + u32 string_length = 0; + u32 minimum_resource_length; - temp16 = (u16) ACPI_ROUND_UP_to_32_bITS(temp16); + ACPI_FUNCTION_ENTRY(); - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_vendor) + - (temp16 * sizeof(u8)); - break; + /* + * The resource_source_index and resource_source are optional elements of some + * Large-type resource descriptors. + */ - case ACPI_RDESC_TYPE_MEMORY_32: - /* - * 32-Bit Memory Range Resource - */ - bytes_consumed = 20; + /* Compute minimum size of the data part of the resource descriptor */ - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_mem32); - break; + minimum_resource_length = + minimum_total_length - sizeof(struct asl_large_header); - case ACPI_RDESC_TYPE_FIXED_MEMORY_32: - /* - * 32-Bit Fixed Memory Resource - */ - bytes_consumed = 12; + /* + * If the length of the actual resource descriptor is greater than the ACPI + * spec-defined minimum length, it means that a resource_source_index exists + * and is followed by a (required) null terminated string. The string length + * (including the null terminator) is the resource length minus the minimum + * length, minus one byte for the resource_source_index itself. + */ + if (resource_length > minimum_resource_length) { + /* Compute the length of the optional string */ - structure_size = - ACPI_SIZEOF_RESOURCE(struct - acpi_resource_fixed_mem32); - break; + string_length = resource_length - minimum_resource_length - 1; + } - case ACPI_RDESC_TYPE_EXTENDED_ADDRESS_SPACE: - /* - * 64-Bit Address Resource - */ - buffer = byte_stream_buffer; + /* Round up length to 32 bits for internal structure alignment */ - ++buffer; - ACPI_MOVE_16_TO_16(&temp16, buffer); + return (ACPI_ROUND_UP_to_32_bITS(string_length)); +} - bytes_consumed = temp16 + 3; - structure_size = - ACPI_SIZEOF_RESOURCE(struct - acpi_resource_address64); - break; +/******************************************************************************* + * + * FUNCTION: acpi_rs_get_byte_stream_length + * + * PARAMETERS: Resource - Pointer to the resource linked list + * size_needed - Where the required size is returned + * + * RETURN: Status + * + * DESCRIPTION: Takes a linked list of internal resource descriptors and + * calculates the size buffer needed to hold the corresponding + * external resource byte stream. + * + ******************************************************************************/ - case ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE: - /* - * 64-Bit Address Resource - */ - buffer = byte_stream_buffer; +acpi_status +acpi_rs_get_byte_stream_length(struct acpi_resource * resource, + acpi_size * size_needed) +{ + acpi_size byte_stream_size_needed = 0; + acpi_size segment_size; - ++buffer; - ACPI_MOVE_16_TO_16(&temp16, buffer); + ACPI_FUNCTION_TRACE("rs_get_byte_stream_length"); - bytes_consumed = temp16 + 3; + /* Traverse entire list of internal resource descriptors */ - /* - * Resource Source Index and Resource Source are optional elements. - * Check the length of the Bytestream. If it is greater than 43, - * that means that an Index exists and is followed by a null - * terminated string. Therefore, set the temp variable to the - * length minus the minimum byte stream length plus the byte for - * the Index to determine the size of the NULL terminated string. - */ - if (43 < temp16) { - temp8 = (u8) (temp16 - 44); - } else { - temp8 = 0; - } + while (resource) { + /* Validate the descriptor type */ - /* Ensure a 64-bit boundary for the structure */ + if (resource->type > ACPI_RSTYPE_MAX) { + return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); + } - temp8 = (u8) ACPI_ROUND_UP_to_64_bITS(temp8); + /* Get the base size of the (external stream) resource descriptor */ - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_address64) - + (temp8 * sizeof(u8)); - break; + segment_size = acpi_gbl_stream_sizes[resource->type]; - case ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE: + /* + * Augment the base size for descriptors with optional and/or + * variable-length fields + */ + switch (resource->type) { + case ACPI_RSTYPE_VENDOR: /* - * 32-Bit Address Resource + * Vendor Defined Resource: + * For a Vendor Specific resource, if the Length is between 1 and 7 + * it will be created as a Small Resource data type, otherwise it + * is a Large Resource data type. */ - buffer = byte_stream_buffer; - - ++buffer; - ACPI_MOVE_16_TO_16(&temp16, buffer); + if (resource->data.vendor_specific.length > 7) { + /* Base size of a Large resource descriptor */ - bytes_consumed = temp16 + 3; - - /* - * Resource Source Index and Resource Source are optional elements. - * Check the length of the Bytestream. If it is greater than 23, - * that means that an Index exists and is followed by a null - * terminated string. Therefore, set the temp variable to the - * length minus the minimum byte stream length plus the byte for - * the Index to determine the size of the NULL terminated string. - */ - if (23 < temp16) { - temp8 = (u8) (temp16 - 24); - } else { - temp8 = 0; + segment_size = 3; } - /* Ensure a 32-bit boundary for the structure */ + /* Add the size of the vendor-specific data */ - temp8 = (u8) ACPI_ROUND_UP_to_32_bITS(temp8); - - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_address32) - + (temp8 * sizeof(u8)); + segment_size += resource->data.vendor_specific.length; break; - case ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE: + case ACPI_RSTYPE_END_TAG: /* - * 16-Bit Address Resource + * End Tag: + * We are done -- return the accumulated total size. */ - buffer = byte_stream_buffer; + *size_needed = byte_stream_size_needed + segment_size; - ++buffer; - ACPI_MOVE_16_TO_16(&temp16, buffer); + /* Normal exit */ - bytes_consumed = temp16 + 3; + return_ACPI_STATUS(AE_OK); + case ACPI_RSTYPE_ADDRESS16: /* - * Resource Source Index and Resource Source are optional elements. - * Check the length of the Bytestream. If it is greater than 13, - * that means that an Index exists and is followed by a null - * terminated string. Therefore, set the temp variable to the - * length minus the minimum byte stream length plus the byte for - * the Index to determine the size of the NULL terminated string. + * 16-Bit Address Resource: + * Add the size of the optional resource_source info */ - if (13 < temp16) { - temp8 = (u8) (temp16 - 14); - } else { - temp8 = 0; - } - - /* Ensure a 32-bit boundary for the structure */ - - temp8 = (u8) ACPI_ROUND_UP_to_32_bITS(temp8); - - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_address16) - + (temp8 * sizeof(u8)); + segment_size += + acpi_rs_struct_option_length(&resource->data. + address16. + resource_source); break; - case ACPI_RDESC_TYPE_EXTENDED_XRUPT: - /* - * Extended IRQ - */ - buffer = byte_stream_buffer; - - ++buffer; - ACPI_MOVE_16_TO_16(&temp16, buffer); - - bytes_consumed = temp16 + 3; - + case ACPI_RSTYPE_ADDRESS32: /* - * Point past the length field and the Interrupt vector flags to - * save off the Interrupt table length to the Temp8 variable. + * 32-Bit Address Resource: + * Add the size of the optional resource_source info */ - buffer += 3; - temp8 = *buffer; + segment_size += + acpi_rs_struct_option_length(&resource->data. + address32. + resource_source); + break; + case ACPI_RSTYPE_ADDRESS64: /* - * To compensate for multiple interrupt numbers, add 4 bytes for - * each additional interrupts greater than 1 + * 64-Bit Address Resource: + * Add the size of the optional resource_source info */ - additional_bytes = (u8) ((temp8 - 1) * 4); + segment_size += + acpi_rs_struct_option_length(&resource->data. + address64. + resource_source); + break; + case ACPI_RSTYPE_EXT_IRQ: /* - * Resource Source Index and Resource Source are optional elements. - * Check the length of the Bytestream. If it is greater than 9, - * that means that an Index exists and is followed by a null - * terminated string. Therefore, set the temp variable to the - * length minus the minimum byte stream length plus the byte for - * the Index to determine the size of the NULL terminated string. + * Extended IRQ Resource: + * Add the size of each additional optional interrupt beyond the + * required 1 (4 bytes for each u32 interrupt number) */ - if (9 + additional_bytes < temp16) { - temp8 = (u8) (temp16 - (9 + additional_bytes)); - } else { - temp8 = 0; - } + segment_size += (((acpi_size) + resource->data.extended_irq. + number_of_interrupts - 1) * 4); - /* Ensure a 32-bit boundary for the structure */ + /* Add the size of the optional resource_source info */ - temp8 = (u8) ACPI_ROUND_UP_to_32_bITS(temp8); + segment_size += + acpi_rs_struct_option_length(&resource->data. + extended_irq. + resource_source); + break; - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_ext_irq) + - (additional_bytes * sizeof(u8)) + - (temp8 * sizeof(u8)); + default: break; + } - case ACPI_RDESC_TYPE_IRQ_FORMAT: - /* - * IRQ Resource. - * Determine if it there are two or three trailing bytes - */ - buffer = byte_stream_buffer; - temp8 = *buffer; + /* Update the total */ - if (temp8 & 0x01) { - bytes_consumed = 4; - } else { - bytes_consumed = 3; - } + byte_stream_size_needed += segment_size; - /* Point past the descriptor */ + /* Point to the next object */ - ++buffer; + resource = ACPI_PTR_ADD(struct acpi_resource, + resource, resource->length); + } - /* Look at the number of bits set */ + /* Did not find an END_TAG descriptor */ - ACPI_MOVE_16_TO_16(&temp16, buffer); + return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); +} - for (index = 0; index < 16; index++) { - if (temp16 & 0x1) { - ++number_of_interrupts; - } +/******************************************************************************* + * + * FUNCTION: acpi_rs_get_list_length + * + * PARAMETERS: byte_stream_buffer - Pointer to the resource byte stream + * byte_stream_buffer_length - Size of byte_stream_buffer + * size_needed - Where the size needed is returned + * + * RETURN: Status + * + * DESCRIPTION: Takes an external resource byte stream and calculates the size + * buffer needed to hold the corresponding internal resource + * descriptor linked list. + * + ******************************************************************************/ - temp16 >>= 1; - } +acpi_status +acpi_rs_get_list_length(u8 * byte_stream_buffer, + u32 byte_stream_buffer_length, acpi_size * size_needed) +{ + u8 *buffer; + ACPI_RESOURCE_SIZES *resource_info; + u32 buffer_size = 0; + u32 bytes_parsed = 0; + u8 resource_type; + u16 temp16; + u16 resource_length; + u16 header_length; + u32 extra_struct_bytes; - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_io) + - (number_of_interrupts * sizeof(u32)); - break; + ACPI_FUNCTION_TRACE("rs_get_list_length"); - case ACPI_RDESC_TYPE_DMA_FORMAT: - /* - * DMA Resource - */ - buffer = byte_stream_buffer; - bytes_consumed = 3; + while (bytes_parsed < byte_stream_buffer_length) { + /* The next byte in the stream is the resource descriptor type */ - /* Point past the descriptor */ + resource_type = acpi_rs_get_resource_type(*byte_stream_buffer); - ++buffer; + /* Get the base stream size and structure sizes for the descriptor */ - /* Look at the number of bits set */ + resource_info = acpi_rs_get_resource_sizes(resource_type); + if (!resource_info) { + return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); + } - temp8 = *buffer; + /* Get the Length field from the input resource descriptor */ - for (index = 0; index < 8; index++) { - if (temp8 & 0x1) { - ++number_of_channels; - } + resource_length = + acpi_rs_get_resource_length(byte_stream_buffer); - temp8 >>= 1; - } + /* Augment the size for descriptors with optional fields */ - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_dma) + - (number_of_channels * sizeof(u32)); - break; + extra_struct_bytes = 0; - case ACPI_RDESC_TYPE_START_DEPENDENT: + if (!(resource_type & ACPI_RDESC_TYPE_LARGE)) { /* - * Start Dependent Functions Resource - * Determine if it there are two or three trailing bytes + * Small resource descriptors */ - buffer = byte_stream_buffer; - temp8 = *buffer; + header_length = 1; + buffer = byte_stream_buffer + header_length; - if (temp8 & 0x01) { - bytes_consumed = 2; - } else { - bytes_consumed = 1; - } + switch (resource_type) { + case ACPI_RDESC_TYPE_IRQ_FORMAT: + /* + * IRQ Resource: + * Get the number of bits set in the IRQ word + */ + ACPI_MOVE_16_TO_16(&temp16, buffer); - structure_size = - ACPI_SIZEOF_RESOURCE(struct - acpi_resource_start_dpf); - break; + extra_struct_bytes = + (acpi_rs_count_set_bits(temp16) * + sizeof(u32)); + break; - case ACPI_RDESC_TYPE_END_DEPENDENT: - /* - * End Dependent Functions Resource - */ - bytes_consumed = 1; - structure_size = ACPI_RESOURCE_LENGTH; - break; + case ACPI_RDESC_TYPE_DMA_FORMAT: + /* + * DMA Resource: + * Get the number of bits set in the DMA channels byte + */ + extra_struct_bytes = + (acpi_rs_count_set_bits((u16) * buffer) * + sizeof(u32)); + break; - case ACPI_RDESC_TYPE_IO_PORT: - /* - * IO Port Resource - */ - bytes_consumed = 8; - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_io); - break; + case ACPI_RDESC_TYPE_SMALL_VENDOR: + /* + * Vendor Specific Resource: + * Ensure a 32-bit boundary for the structure + */ + extra_struct_bytes = + ACPI_ROUND_UP_to_32_bITS(resource_length); + break; - case ACPI_RDESC_TYPE_FIXED_IO_PORT: - /* - * Fixed IO Port Resource - */ - bytes_consumed = 4; - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_fixed_io); - break; + case ACPI_RDESC_TYPE_END_TAG: + /* + * End Tag: + * Terminate the loop now + */ + byte_stream_buffer_length = bytes_parsed; + break; - case ACPI_RDESC_TYPE_SMALL_VENDOR: + default: + break; + } + } else { /* - * Vendor Specific Resource + * Large resource descriptors */ - buffer = byte_stream_buffer; + header_length = sizeof(struct asl_large_header); + buffer = byte_stream_buffer + header_length; - temp8 = *buffer; - temp8 = (u8) (temp8 & 0x7); - bytes_consumed = temp8 + 1; + switch (resource_type) { + case ACPI_RDESC_TYPE_LARGE_VENDOR: + /* + * Vendor Defined Resource: + * Add vendor data and ensure a 32-bit boundary for the structure + */ + extra_struct_bytes = + ACPI_ROUND_UP_to_32_bITS(resource_length); + break; - /* Ensure a 32-bit boundary for the structure */ + case ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE: + case ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE: + /* + * 32-Bit or 16-bit Address Resource: + * Add the size of any optional data (resource_source) + */ + extra_struct_bytes = + acpi_rs_stream_option_length + (resource_length, + resource_info->minimum_stream_size); + break; - temp8 = (u8) ACPI_ROUND_UP_to_32_bITS(temp8); - structure_size = - ACPI_SIZEOF_RESOURCE(struct acpi_resource_vendor) + - (temp8 * sizeof(u8)); - break; + case ACPI_RDESC_TYPE_EXTENDED_XRUPT: + /* + * Extended IRQ: + * Point past the interrupt_vector_flags to get the + * interrupt_table_length. + */ + buffer++; - case ACPI_RDESC_TYPE_END_TAG: - /* - * End Tag - */ - bytes_consumed = 2; - structure_size = ACPI_RESOURCE_LENGTH; - byte_stream_buffer_length = bytes_parsed; - break; + /* + * Add 4 bytes for each additional interrupt. Note: at least one + * interrupt is required and is included in the minimum + * descriptor size + */ + extra_struct_bytes = + ((*buffer - 1) * sizeof(u32)); - default: - /* - * If we get here, everything is out of sync, - * exit with an error - */ - return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); - } + /* Add the size of any optional data (resource_source) */ - /* Update the return value and counter */ + extra_struct_bytes += + acpi_rs_stream_option_length(resource_length + - + extra_struct_bytes, + resource_info-> + minimum_stream_size); + break; - buffer_size += (u32) ACPI_ALIGN_RESOURCE_SIZE(structure_size); - bytes_parsed += bytes_consumed; + case ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE: + /* + * 64-Bit Address Resource: + * Add the size of any optional data (resource_source) + * Ensure a 64-bit boundary for the structure + */ + extra_struct_bytes = + ACPI_ROUND_UP_to_64_bITS + (acpi_rs_stream_option_length + (resource_length, + resource_info->minimum_stream_size)); + break; + + default: + break; + } + } + + /* Update the required buffer size for the internal descriptor structs */ - /* Set the byte stream to point to the next resource */ + temp16 = + (u16) (resource_info->minimum_struct_size + + extra_struct_bytes); + buffer_size += (u32) ACPI_ALIGN_RESOURCE_SIZE(temp16); - byte_stream_buffer += bytes_consumed; + /* + * Update byte count and point to the next resource within the stream + * using the size of the header plus the length contained in the header + */ + temp16 = (u16) (header_length + resource_length); + bytes_parsed += temp16; + byte_stream_buffer += temp16; } /* This is the data the caller needs */ |