diff options
Diffstat (limited to 'drivers/acpi/resources/rsutils.c')
| -rw-r--r-- | drivers/acpi/resources/rsutils.c | 269 |
1 files changed, 133 insertions, 136 deletions
diff --git a/drivers/acpi/resources/rsutils.c b/drivers/acpi/resources/rsutils.c index 9d503de1a34..7613033f5dc 100644 --- a/drivers/acpi/resources/rsutils.c +++ b/drivers/acpi/resources/rsutils.c @@ -50,6 +50,64 @@ ACPI_MODULE_NAME("rsutils") /******************************************************************************* * + * FUNCTION: acpi_rs_decode_bitmask + * + * PARAMETERS: Mask - Bitmask to decode + * List - Where the converted list is returned + * + * RETURN: Count of bits set (length of list) + * + * DESCRIPTION: Convert a bit mask into a list of values + * + ******************************************************************************/ +u8 acpi_rs_decode_bitmask(u16 mask, u8 * list) +{ + acpi_native_uint i; + u8 bit_count; + + /* Decode the mask bits */ + + for (i = 0, bit_count = 0; mask; i++) { + if (mask & 0x0001) { + list[bit_count] = (u8) i; + bit_count++; + } + + mask >>= 1; + } + + return (bit_count); +} + +/******************************************************************************* + * + * FUNCTION: acpi_rs_encode_bitmask + * + * PARAMETERS: List - List of values to encode + * Count - Length of list + * + * RETURN: Encoded bitmask + * + * DESCRIPTION: Convert a list of values to an encoded bitmask + * + ******************************************************************************/ + +u16 acpi_rs_encode_bitmask(u8 * list, u8 count) +{ + acpi_native_uint i; + u16 mask; + + /* Encode the list into a single bitmask */ + + for (i = 0, mask = 0; i < count; i++) { + mask |= (0x0001 << list[i]); + } + + return (mask); +} + +/******************************************************************************* + * * FUNCTION: acpi_rs_move_data * * PARAMETERS: Destination - Pointer to the destination descriptor @@ -64,6 +122,7 @@ ACPI_MODULE_NAME("rsutils") * via the ACPI_MOVE_* macros. (This is why a memcpy is not used) * ******************************************************************************/ + void acpi_rs_move_data(void *destination, void *source, u16 item_count, u8 move_type) { @@ -73,22 +132,30 @@ acpi_rs_move_data(void *destination, void *source, u16 item_count, u8 move_type) for (i = 0; i < item_count; i++) { switch (move_type) { - case ACPI_MOVE_TYPE_16_TO_32: - ACPI_MOVE_16_TO_32(&((u32 *) destination)[i], - &((u16 *) source)[i]); - break; + /* + * For the 8-bit case, we can perform the move all at once + * since there are no alignment or endian issues + */ + case ACPI_RSC_MOVE8: + ACPI_MEMCPY(destination, source, item_count); + return; - case ACPI_MOVE_TYPE_32_TO_16: - ACPI_MOVE_32_TO_16(&((u16 *) destination)[i], - &((u32 *) source)[i]); + /* + * 16-, 32-, and 64-bit cases must use the move macros that perform + * endian conversion and/or accomodate hardware that cannot perform + * misaligned memory transfers + */ + case ACPI_RSC_MOVE16: + ACPI_MOVE_16_TO_16(&((u16 *) destination)[i], + &((u16 *) source)[i]); break; - case ACPI_MOVE_TYPE_32_TO_32: + case ACPI_RSC_MOVE32: ACPI_MOVE_32_TO_32(&((u32 *) destination)[i], &((u32 *) source)[i]); break; - case ACPI_MOVE_TYPE_64_TO_64: + case ACPI_RSC_MOVE64: ACPI_MOVE_64_TO_64(&((u64 *) destination)[i], &((u64 *) source)[i]); break; @@ -148,80 +215,57 @@ struct acpi_resource_info *acpi_rs_get_resource_info(u8 resource_type) /******************************************************************************* * - * FUNCTION: acpi_rs_get_resource_length + * FUNCTION: acpi_rs_set_resource_length * - * PARAMETERS: Aml - Pointer to the raw AML resource descriptor + * PARAMETERS: total_length - Length of the AML descriptor, including + * the header and length fields. + * Aml - Pointer to the raw AML descriptor * - * RETURN: Byte Length + * RETURN: None * - * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By - * definition, this does not include the size of the descriptor - * header or the length field itself. + * DESCRIPTION: Set the resource_length field of an AML + * resource descriptor, both Large and Small descriptors are + * supported automatically. Note: Descriptor Type field must + * be valid. * ******************************************************************************/ -u16 acpi_rs_get_resource_length(union aml_resource * aml) +void +acpi_rs_set_resource_length(acpi_rsdesc_size total_length, + union aml_resource *aml) { - u16 resource_length; + acpi_rs_length resource_length; ACPI_FUNCTION_ENTRY(); /* Determine if this is a small or large resource */ - if (aml->large_header.descriptor_type & ACPI_RESOURCE_NAME_LARGE) { + if (aml->small_header.descriptor_type & ACPI_RESOURCE_NAME_LARGE) { /* Large Resource type -- bytes 1-2 contain the 16-bit length */ - ACPI_MOVE_16_TO_16(&resource_length, - &aml->large_header.resource_length); + resource_length = (acpi_rs_length) + (total_length - sizeof(struct aml_resource_large_header)); + + /* Insert length into the Large descriptor length field */ + ACPI_MOVE_16_TO_16(&aml->large_header.resource_length, + &resource_length); } else { /* Small Resource type -- bits 2:0 of byte 0 contain the length */ - resource_length = (u16) (aml->small_header.descriptor_type & - ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK); - } - - return (resource_length); -} + resource_length = (acpi_rs_length) + (total_length - sizeof(struct aml_resource_small_header)); -/******************************************************************************* - * - * FUNCTION: acpi_rs_get_descriptor_length - * - * PARAMETERS: Aml - Pointer to the raw AML resource descriptor - * - * RETURN: Byte length - * - * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the - * length of the descriptor header and the length field itself. - * Used to walk descriptor lists. - * - ******************************************************************************/ - -u32 acpi_rs_get_descriptor_length(union aml_resource * aml) -{ - u32 descriptor_length; - - ACPI_FUNCTION_ENTRY(); - - /* Determine if this is a small or large resource */ - - if (aml->large_header.descriptor_type & ACPI_RESOURCE_NAME_LARGE) { - /* Large Resource type -- bytes 1-2 contain the 16-bit length */ + /* Insert length into the descriptor type byte */ - ACPI_MOVE_16_TO_32(&descriptor_length, - &aml->large_header.resource_length); - descriptor_length += sizeof(struct aml_resource_large_header); + aml->small_header.descriptor_type = (u8) - } else { - /* Small Resource type -- bits 2:0 of byte 0 contain the length */ + /* Clear any existing length, preserving descriptor type bits */ + ((aml->small_header. + descriptor_type & ~ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK) - descriptor_length = (u32) (aml->small_header.descriptor_type & - ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK); - descriptor_length += sizeof(struct aml_resource_small_header); + | resource_length); } - - return (descriptor_length); } /******************************************************************************* @@ -243,71 +287,18 @@ u32 acpi_rs_get_descriptor_length(union aml_resource * aml) void acpi_rs_set_resource_header(u8 descriptor_type, - acpi_size total_length, union aml_resource *aml) + acpi_rsdesc_size total_length, + union aml_resource *aml) { - u16 resource_length; - ACPI_FUNCTION_ENTRY(); - /* Set the descriptor type */ + /* Set the Descriptor Type */ aml->small_header.descriptor_type = descriptor_type; - /* Determine if this is a small or large resource */ - - if (aml->small_header.descriptor_type & ACPI_RESOURCE_NAME_LARGE) { - /* Large Resource type -- bytes 1-2 contain the 16-bit length */ - - resource_length = - (u16) (total_length - - sizeof(struct aml_resource_large_header)); - - /* Insert length into the Large descriptor length field */ - - ACPI_MOVE_16_TO_16(&aml->large_header.resource_length, - &resource_length); - } else { - /* Small Resource type -- bits 2:0 of byte 0 contain the length */ - - resource_length = - (u16) (total_length - - sizeof(struct aml_resource_small_header)); - - /* Insert length into the descriptor type byte */ - - aml->small_header.descriptor_type |= (u8) resource_length; - } -} - -/******************************************************************************* - * - * FUNCTION: acpi_rs_get_resource_type - * - * PARAMETERS: resource_type - Byte 0 of a resource descriptor - * - * RETURN: The Resource Type with no extraneous bits (except the - * Large/Small descriptor bit -- this is left alone) - * - * DESCRIPTION: Extract the Resource Type/Name from the first byte of - * a resource descriptor. - * - ******************************************************************************/ - -u8 acpi_rs_get_resource_type(u8 resource_type) -{ - ACPI_FUNCTION_ENTRY(); + /* Set the Resource Length */ - /* Determine if this is a small or large resource */ - - if (resource_type & ACPI_RESOURCE_NAME_LARGE) { - /* Large Resource Type -- bits 6:0 contain the name */ - - return (resource_type); - } else { - /* Small Resource Type -- bits 6:3 contain the name */ - - return ((u8) (resource_type & ACPI_RESOURCE_NAME_SMALL_MASK)); - } + acpi_rs_set_resource_length(total_length, aml); } /******************************************************************************* @@ -360,13 +351,13 @@ static u16 acpi_rs_strcpy(char *destination, char *source) * ******************************************************************************/ -u16 -acpi_rs_get_resource_source(u16 resource_length, - acpi_size minimum_length, +acpi_rs_length +acpi_rs_get_resource_source(acpi_rs_length resource_length, + acpi_rs_length minimum_length, struct acpi_resource_source * resource_source, union aml_resource * aml, char *string_ptr) { - acpi_size total_length; + acpi_rsdesc_size total_length; u8 *aml_resource_source; ACPI_FUNCTION_ENTRY(); @@ -382,7 +373,7 @@ acpi_rs_get_resource_source(u16 resource_length, * Note: Some resource descriptors will have an additional null, so * we add 1 to the minimum length. */ - if (total_length > (minimum_length + 1)) { + if (total_length > (acpi_rsdesc_size) (minimum_length + 1)) { /* Get the resource_source_index */ resource_source->index = aml_resource_source[0]; @@ -398,20 +389,26 @@ acpi_rs_get_resource_source(u16 resource_length, sizeof(struct acpi_resource_source); } + /* + * In order for the struct_size to fall on a 32-bit boundary, calculate + * the length of the string (+1 for the NULL terminator) and expand the + * struct_size to the next 32-bit boundary. + * + * Zero the entire area of the buffer. + */ + total_length = + ACPI_ROUND_UP_to_32_bITS(ACPI_STRLEN + ((char *)&aml_resource_source[1]) + + 1); + ACPI_MEMSET(resource_source->string_ptr, 0, total_length); + /* Copy the resource_source string to the destination */ resource_source->string_length = acpi_rs_strcpy(resource_source->string_ptr, (char *)&aml_resource_source[1]); - /* - * In order for the struct_size to fall on a 32-bit boundary, - * calculate the length of the string and expand the - * struct_size to the next 32-bit boundary. - */ - return ((u16) - ACPI_ROUND_UP_to_32_bITS(resource_source-> - string_length)); + return ((acpi_rs_length) total_length); } else { /* resource_source is not present */ @@ -434,18 +431,18 @@ acpi_rs_get_resource_source(u16 resource_length, * * RETURN: Total length of the AML descriptor * - * DESCRIPTION: Convert an optoinal resource_source from internal format to a + * DESCRIPTION: Convert an optional resource_source from internal format to a * raw AML resource descriptor * ******************************************************************************/ -acpi_size +acpi_rsdesc_size acpi_rs_set_resource_source(union aml_resource * aml, - acpi_size minimum_length, + acpi_rs_length minimum_length, struct acpi_resource_source * resource_source) { u8 *aml_resource_source; - acpi_size descriptor_length; + acpi_rsdesc_size descriptor_length; ACPI_FUNCTION_ENTRY(); @@ -472,7 +469,7 @@ acpi_rs_set_resource_source(union aml_resource * aml, * final descriptor length */ descriptor_length += - ((acpi_size) resource_source->string_length + 1); + ((acpi_rsdesc_size) resource_source->string_length + 1); } /* Return the new total length of the AML descriptor */ |