From 3829f238fa6eca7676ea3122da94a1ba239c5153 Mon Sep 17 00:00:00 2001 From: Duncan Laurie Date: Mon, 9 May 2016 11:08:46 -0700 Subject: acpigen: Add function to generate ToUUID() from a string acpigen_write_uuid() will generate a ToUUID() 128-bit buffer object for a common universally unique identifier that is passed as a string. The resulting buffer is the UUID in byte format with a specific order of the bytes as described in the ACPI specification: ToUUID (uuid) Compiles to: Buffer (16) { uuid[3], uuid[2], uuid[1], uuid[0], uuid[5], uuid[4], uuid[7], uuid[6], uuid[8], uuid[9], uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15] } Change-Id: Ibbeff926883532dd78477aaa2d26ffffb6ef30c0 Signed-off-by: Duncan Laurie Reviewed-on: https://review.coreboot.org/14838 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/arch/x86/acpigen.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'src/arch/x86/acpigen.c') diff --git a/src/arch/x86/acpigen.c b/src/arch/x86/acpigen.c index 226fba153c..c370321835 100644 --- a/src/arch/x86/acpigen.c +++ b/src/arch/x86/acpigen.c @@ -24,6 +24,7 @@ #define ACPIGEN_MAXLEN 0xfffff +#include #include #include #include @@ -827,3 +828,38 @@ void acpigen_emit_eisaid(const char *eisaid) acpigen_emit_byte((compact >> 8) & 0xff); acpigen_emit_byte(compact & 0xff); } + +/* + * ToUUID(uuid) + * + * ACPI 6.1 Section 19.6.136 table 19-385 defines a special output + * order for the bytes that make up a UUID Buffer object. + * UUID byte order for input: + * aabbccdd-eeff-gghh-iijj-kkllmmnnoopp + * UUID byte order for output: + * ddccbbaa-ffee-hhgg-iijj-kkllmmnnoopp + */ +#define UUID_LEN 16 +void acpigen_write_uuid(const char *uuid) +{ + uint8_t buf[UUID_LEN]; + size_t i, order[UUID_LEN] = { 3, 2, 1, 0, 5, 4, 7, 6, + 8, 9, 10, 11, 12, 13, 14, 15 }; + + /* Parse UUID string into bytes */ + if (hexstrtobin(uuid, buf, UUID_LEN) < UUID_LEN) + return; + + /* BufferOp */ + acpigen_emit_byte(0x11); + acpigen_write_len_f(); + + /* Buffer length in bytes */ + acpigen_write_word(UUID_LEN); + + /* Output UUID in expected order */ + for (i = 0; i < UUID_LEN; i++) + acpigen_emit_byte(buf[order[i]]); + + acpigen_pop_len(); +} -- cgit v1.2.3