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Diffstat (limited to '')
-rw-r--r-- | drivers/acpi/acpica/utuuid.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utuuid.c b/drivers/acpi/acpica/utuuid.c new file mode 100644 index 000000000..e24bc670b --- /dev/null +++ b/drivers/acpi/acpica/utuuid.c @@ -0,0 +1,105 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: utuuid -- UUID support functions + * + * Copyright (C) 2000 - 2022, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" + +#define _COMPONENT ACPI_COMPILER +ACPI_MODULE_NAME("utuuid") + +#if (defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP || defined ACPI_HELP_APP) +/* + * UUID support functions. + * + * This table is used to convert an input UUID ascii string to a 16 byte + * buffer and the reverse. The table maps a UUID buffer index 0-15 to + * the index within the 36-byte UUID string where the associated 2-byte + * hex value can be found. + * + * 36-byte UUID strings are of the form: + * aabbccdd-eeff-gghh-iijj-kkllmmnnoopp + * Where aa-pp are one byte hex numbers, made up of two hex digits + * + * Note: This table is basically the inverse of the string-to-offset table + * found in the ACPI spec in the description of the to_UUID macro. + */ +const u8 acpi_gbl_map_to_uuid_offset[UUID_BUFFER_LENGTH] = { + 6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 24, 26, 28, 30, 32, 34 +}; + +/******************************************************************************* + * + * FUNCTION: acpi_ut_convert_string_to_uuid + * + * PARAMETERS: in_string - 36-byte formatted UUID string + * uuid_buffer - Where the 16-byte UUID buffer is returned + * + * RETURN: None. Output data is returned in the uuid_buffer + * + * DESCRIPTION: Convert a 36-byte formatted UUID string to 16-byte UUID buffer + * + ******************************************************************************/ + +void acpi_ut_convert_string_to_uuid(char *in_string, u8 *uuid_buffer) +{ + u32 i; + + for (i = 0; i < UUID_BUFFER_LENGTH; i++) { + uuid_buffer[i] = + (acpi_ut_ascii_char_to_hex + (in_string[acpi_gbl_map_to_uuid_offset[i]]) << 4); + + uuid_buffer[i] |= + acpi_ut_ascii_char_to_hex(in_string + [acpi_gbl_map_to_uuid_offset[i] + + 1]); + } +} + +/******************************************************************************* + * + * FUNCTION: acpi_ut_convert_uuid_to_string + * + * PARAMETERS: uuid_buffer - 16-byte UUID buffer + * out_string - 36-byte formatted UUID string + * + * RETURN: Status + * + * DESCRIPTION: Convert 16-byte UUID buffer to 36-byte formatted UUID string + * out_string must be 37 bytes to include null terminator. + * + ******************************************************************************/ + +acpi_status acpi_ut_convert_uuid_to_string(char *uuid_buffer, char *out_string) +{ + u32 i; + + if (!uuid_buffer || !out_string) { + return (AE_BAD_PARAMETER); + } + + for (i = 0; i < UUID_BUFFER_LENGTH; i++) { + out_string[acpi_gbl_map_to_uuid_offset[i]] = + acpi_ut_hex_to_ascii_char(uuid_buffer[i], 4); + + out_string[acpi_gbl_map_to_uuid_offset[i] + 1] = + acpi_ut_hex_to_ascii_char(uuid_buffer[i], 0); + } + + /* Insert required hyphens (dashes) */ + + out_string[UUID_HYPHEN1_OFFSET] = + out_string[UUID_HYPHEN2_OFFSET] = + out_string[UUID_HYPHEN3_OFFSET] = + out_string[UUID_HYPHEN4_OFFSET] = '-'; + + out_string[UUID_STRING_LENGTH] = 0; /* Null terminate */ + return (AE_OK); +} +#endif |