ACPI S3: Split arch-agnostic parts

Change-Id: I9fc2d1cdbb280f781045882bc4ac98c67946953e
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42614
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/acpi/acpi_pm.c

@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi.h>
+#include <console/console.h>
+#include <romstage_handoff.h>
+
+/* This is filled with acpi_handoff_wakeup_s3() call early in ramstage. */
+static int acpi_slp_type = -1;
+
+static void acpi_handoff_wakeup(void)
+{
+	if (acpi_slp_type < 0) {
+		if (romstage_handoff_is_resume()) {
+			printk(BIOS_DEBUG, "S3 Resume\n");
+			acpi_slp_type = ACPI_S3;
+		} else {
+			printk(BIOS_DEBUG, "Normal boot\n");
+			acpi_slp_type = ACPI_S0;
+		}
+	}
+}
+
+int acpi_handoff_wakeup_s3(void)
+{
+	acpi_handoff_wakeup();
+	return (acpi_slp_type == ACPI_S3);
+}
+
+void __weak mainboard_suspend_resume(void)
+{
+}