From 57c661c48d746f0e090645ce6704d261764685c2 Mon Sep 17 00:00:00 2001
From: Peter Fang <peter.fang@intel.com>
Date: Mon, 24 Dec 2018 21:44:35 -0800
Subject: [PATCH] dm: vrtc: add RTC to ACPI DSDT

Clear Linux complains about not finding RTC as a PNP device:

platform rtc_cmos: registered platform RTC device (no PNP device found)

This is a port of Bhyve vRTC's user-space logic.

Tracked-On: #2176
Signed-off-by: Peter Fang <peter.fang@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@intel.com>
Reviewed-by: Victor Sun <victor.sun@intel.com>
---
 devicemodel/hw/platform/rtc.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/devicemodel/hw/platform/rtc.c b/devicemodel/hw/platform/rtc.c
index 3376f6ec2..bbb218975 100644
--- a/devicemodel/hw/platform/rtc.c
+++ b/devicemodel/hw/platform/rtc.c
@@ -39,6 +39,8 @@
 #include "rtc.h"
 #include "mevent.h"
 #include "timer.h"
+#include "acpi.h"
+#include "lpc.h"
 
 /* #define DEBUG_RTC */
 #ifdef DEBUG_RTC
@@ -1178,3 +1180,27 @@ vrtc_deinit(struct vmctx *ctx)
 	free(vrtc);
 	ctx->vrtc = NULL;
 }
+
+static void
+rtc_dsdt(void)
+{
+	dsdt_line("");
+	dsdt_line("Device (RTC)");
+	dsdt_line("{");
+	dsdt_line("  Name (_HID, EisaId (\"PNP0B00\"))");
+	dsdt_line("  Name (_CRS, ResourceTemplate ()");
+	dsdt_line("  {");
+	dsdt_indent(2);
+	dsdt_fixed_ioport(IO_RTC, 2);
+	dsdt_fixed_irq(8);
+	dsdt_unindent(2);
+	dsdt_line("  })");
+	dsdt_line("}");
+}
+LPC_DSDT(rtc_dsdt);
+
+/*
+ * Reserve the extended RTC I/O ports although they are not emulated at this
+ * time.
+ */
+SYSRES_IO(0x72, 6);