acpi/acpigen: point out what acpigen_write_len_f does
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ibaf2f54f2f428f4438ef22b7f9d205db10e144db
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79001
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
diff --git a/src/acpi/acpigen.c b/src/acpi/acpigen.c
index b2db19d..57f0d10 100644
--- a/src/acpi/acpigen.c
+++ b/src/acpi/acpigen.c
@@ -29,6 +29,8 @@
{
ASSERT(ltop < (ACPIGEN_LENSTACK_SIZE - 1))
len_stack[ltop++] = gencurrent;
+ /* Reserve 3 bytes for PkgLength. The actual byte values will be written later in the
+ acpigen_pop_len call. */
acpigen_emit_byte(0);
acpigen_emit_byte(0);
acpigen_emit_byte(0);