This can allow the guest OS to determine more easily if i8042 controller
is present in the system or not, so it doesn't need to do probing of the
controller, but just initialize it immediately, before enumerating the
ACPI AML namespace.
Signed-off-by: Liav Albani <liav...@gmail.com>
---
hw/acpi/aml-build.c | 7 ++++++-
hw/i386/acpi-build.c | 8 ++++++++
hw/i386/acpi-microvm.c | 9 +++++++++
include/hw/acpi/acpi-defs.h | 1 +
4 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 8966e16320..ef5f4cad87 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -2152,7 +2152,12 @@ void build_fadt(GArray *tbl, BIOSLinker *linker, const
AcpiFadtData *f,
build_append_int_noprefix(tbl, 0, 1); /* DAY_ALRM */
build_append_int_noprefix(tbl, 0, 1); /* MON_ALRM */
build_append_int_noprefix(tbl, f->rtc_century, 1); /* CENTURY */
- build_append_int_noprefix(tbl, 0, 2); /* IAPC_BOOT_ARCH */
+ /* IAPC_BOOT_ARCH */
+ if (f->rev == 1) {
+ build_append_int_noprefix(tbl, 0, 2);
+ } else {
+ build_append_int_noprefix(tbl, f->iapc_boot_arch, 2);
+ }
build_append_int_noprefix(tbl, 0, 1); /* Reserved */
build_append_int_noprefix(tbl, f->flags, 4); /* Flags */
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index ebd47aa26f..65dbc1ec36 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -192,6 +192,14 @@ static void init_common_fadt_data(MachineState *ms, Object
*o,
.address = object_property_get_uint(o, ACPI_PM_PROP_GPE0_BLK, NULL)
},
};
+ /*
+ * second bit of 16 but IAPC_BOOT_ARCH indicates presence of 8042 or
+ * equivalent micro controller. See table 5-10 of APCI spec version 2.0
+ * (the earliest acpi revision that supports this).
+ */
+
+ fadt.iapc_boot_arch = isa_check_device_existence("i8042") ? 0x0002 :
0x0000;
