From f7b23c80e4b5975d1beecbe0b39380cde5dd2ab2 Mon Sep 17 00:00:00 2001
From: Tarun Tuli <taruntuli@google.com>
Date: Thu, 30 Mar 2023 12:46:38 +0000
Subject: [PATCH] mb/google/brya/acpi: LTOB - Add support for a 8 byte integer
 to buffer

This function adds support to convert a integer into a 8 byte buffer

TEST=verified returned buffer is as expected using acpiexec
BUG=b:271938907
Signed-off-by: Tarun Tuli <taruntuli@google.com>

Change-Id: I89eb50f1452657c26b97eb5609ed956fa8ee8117
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73898
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
---
 src/mainboard/google/brya/acpi/utility.asl | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/mainboard/google/brya/acpi/utility.asl b/src/mainboard/google/brya/acpi/utility.asl
index 9cdfb49c41..49f3dca8e9 100644
--- a/src/mainboard/google/brya/acpi/utility.asl
+++ b/src/mainboard/google/brya/acpi/utility.asl
@@ -37,3 +37,18 @@ Method (ITOB, 1)
 	Local0[3] = (Arg0 >> 24) & 0xFF
 	Return (Local0)
 }
+
+/* Convert from 64-bit integer to 8-byte buffer (little-endian) */
+Method (LTOB, 1)
+{
+	Local0 = Buffer(8) { 0, 0, 0, 0, 0, 0, 0, 0 }
+	Local0[0] = Arg0 & 0xFF
+	Local0[1] = (Arg0 >> 8) & 0xFF
+	Local0[2] = (Arg0 >> 16) & 0xFF
+	Local0[3] = (Arg0 >> 24) & 0xFF
+	Local0[4] = (Arg0 >> 32) & 0xFF
+	Local0[5] = (Arg0 >> 40) & 0xFF
+	Local0[6] = (Arg0 >> 48) & 0xFF
+	Local0[7] = (Arg0 >> 56) & 0xFF
+	Return (Local0)
+}