diff options
Diffstat (limited to 'lib/acpi/acpigen.c')
| -rw-r--r-- | lib/acpi/acpigen.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/lib/acpi/acpigen.c b/lib/acpi/acpigen.c index 0a6c1e37c5..3e8374e65e 100644 --- a/lib/acpi/acpigen.c +++ b/lib/acpi/acpigen.c @@ -11,6 +11,7 @@ #include <common.h> #include <dm.h> #include <log.h> +#include <uuid.h> #include <acpi/acpigen.h> #include <dm/acpi.h> @@ -249,3 +250,40 @@ void acpigen_write_name(struct acpi_ctx *ctx, const char *namepath) acpigen_emit_byte(ctx, NAME_OP); acpigen_emit_namestring(ctx, namepath); } + +/* + * ToUUID(uuid) + * + * ACPI 6.3 Section 19.6.142 table 19-438 defines a special output order for the + * bytes that make up a UUID Buffer object: + * + * UUID byte order for input to this function: + * aabbccdd-eeff-gghh-iijj-kkllmmnnoopp + * + * UUID byte order output by this function: + * ddccbbaa-ffee-hhgg-iijj-kkllmmnnoopp + */ +int acpigen_write_uuid(struct acpi_ctx *ctx, const char *uuid) +{ + u8 buf[UUID_BIN_LEN]; + int ret; + + /* Parse UUID string into bytes */ + ret = uuid_str_to_bin(uuid, buf, UUID_STR_FORMAT_GUID); + if (ret) + return log_msg_ret("bad hex", -EINVAL); + + /* BufferOp */ + acpigen_emit_byte(ctx, BUFFER_OP); + acpigen_write_len_f(ctx); + + /* Buffer length in bytes */ + acpigen_write_word(ctx, UUID_BIN_LEN); + + /* Output UUID in expected order */ + acpigen_emit_stream(ctx, (char *)buf, UUID_BIN_LEN); + + acpigen_pop_len(ctx); + + return 0; +} |