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 <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/14838
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/arch/x86/acpigen.c b/src/arch/x86/acpigen.c
index 226fba1..c370321 100644
--- a/src/arch/x86/acpigen.c
+++ b/src/arch/x86/acpigen.c
@@ -24,6 +24,7 @@
#define ACPIGEN_MAXLEN 0xfffff
+#include <lib.h>
#include <string.h>
#include <arch/acpigen.h>
#include <console/console.h>
@@ -827,3 +828,38 @@
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();
+}