lib: put romstage_handoff implementation in own compilation unit

Instead of putting all the functions inline just put the
current implementation into a C file. That way all the implementation
innards are not exposed.

Lastly, fix up the fallout of compilation units not including the
headers they actually use.

Change-Id: I01fd25d158c0d5016405b73a4d4df3721c281b04
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/17648
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/lib/Makefile.inc

@@ -87,6 +87,8 @@ romstage-$(CONFIG_PRIMITIVE_MEMTEST) += primitive_memtest.c
 ramstage-$(CONFIG_PRIMITIVE_MEMTEST) += primitive_memtest.c
 romstage-$(CONFIG_CACHE_AS_RAM) += ramtest.c
 romstage-$(CONFIG_GENERIC_GPIO_LIB) += gpio.c
+ramstage-y += romstage_handoff.c
+romstage-y += romstage_handoff.c
 romstage-y += romstage_stack.c
 ramstage-y += romstage_stack.c
 romstage-y += stack.c
@@ -153,6 +155,7 @@ postcar-y += cbmem_common.c
 postcar-$(CONFIG_CONSOLE_CBMEM) += cbmem_console.c
 postcar-y += imd_cbmem.c
 postcar-y += imd.c
+postcar-y += romstage_handoff.c
 
 bootblock-y += hexdump.c
 ramstage-y += hexdump.c

src/lib/romstage_handoff.c

@@ -0,0 +1,80 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <romstage_handoff.h>
+#include <rules.h>
+
+struct romstage_handoff {
+	/* Indicate if the current boot is an S3 resume. If
+	 * CONFIG_RELOCTABLE_RAMSTAGE is enabled the chipset code is
+	 * responsible for initializing this variable. Otherwise, ramstage
+	 * will be re-loaded from cbfs (which can be slower since it lives
+	 * in flash). */
+	uint8_t s3_resume;
+	uint8_t reboot_required;
+	uint8_t reserved[2];
+};
+
+static struct romstage_handoff *romstage_handoff_find_or_add(void)
+{
+	struct romstage_handoff *handoff;
+
+	/* cbmem_add() first does a find and uses the old location before the
+	 * real add. However, it is important to know when the structure is not
+	 * found so it can be initialized to 0. */
+	handoff = cbmem_find(CBMEM_ID_ROMSTAGE_INFO);
+
+	if (handoff)
+		return handoff;
+
+	handoff = cbmem_add(CBMEM_ID_ROMSTAGE_INFO, sizeof(*handoff));
+
+	if (handoff != NULL)
+		memset(handoff, 0, sizeof(*handoff));
+	else
+		printk(BIOS_DEBUG, "Romstage handoff structure not added!\n");
+
+	return handoff;
+}
+
+int romstage_handoff_init(int is_s3_resume)
+{
+	struct romstage_handoff *handoff;
+
+	handoff = romstage_handoff_find_or_add();
+
+	if (handoff == NULL)
+		return -1;
+
+	handoff->s3_resume = is_s3_resume;
+
+	return 0;
+}
+
+int romstage_handoff_is_resume(void)
+{
+	struct romstage_handoff *handoff;
+
+	handoff = cbmem_find(CBMEM_ID_ROMSTAGE_INFO);
+
+	if (handoff == NULL)
+		return 0;
+
+	return handoff->s3_resume;
+}