fmap: new API using region_device

Instead of being pointer based use the region infrastrucutre.
Additionally, this removes the need for arch-specific compilation
paths. The users of the new API can use the region APIs to memory
map or read the region provided by the new fmap API.

Change-Id: Ie36e9ff9cb554234ec394b921f029eeed6845aee
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9170
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/lib/fmap.c

@@ -0,0 +1,119 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2012-2015 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+#include <boot_device.h>
+#include <console/console.h>
+#include <fmap.h>
+#include <fmap_serialized.h>
+#include <stddef.h>
+#include <string.h>
+
+/*
+ * See http://code.google.com/p/flashmap/ for more information on FMAP.
+ */
+
+static int find_fmap_directory(struct region_device *fmrd)
+{
+	const struct region_device *boot;
+	struct fmap *fmap;
+	size_t fmap_size;
+	size_t offset = CONFIG_FLASHMAP_OFFSET;
+
+	boot_device_init();
+	boot = boot_device_ro();
+
+	if (boot == NULL)
+		return -1;
+
+	fmap_size = sizeof(struct fmap);
+
+	fmap = rdev_mmap(boot, offset, fmap_size);
+
+	if (fmap == NULL)
+		return -1;
+
+	if (memcmp(fmap->signature, FMAP_SIGNATURE, sizeof(fmap->signature))) {
+		printk(BIOS_DEBUG, "No FMAP found at %zx offset.\n", offset);
+		rdev_munmap(boot, fmap);
+		return -1;
+	}
+
+	printk(BIOS_DEBUG, "FMAP: Found \"%s\" version %d.%d at %zx.\n",
+	       fmap->name, fmap->ver_major, fmap->ver_minor, offset);
+	printk(BIOS_DEBUG, "FMAP: base = %llx size = %x #areas = %d\n",
+	       (long long)fmap->base, fmap->size, fmap->nareas);
+
+	fmap_size += fmap->nareas * sizeof(struct fmap_area);
+
+	rdev_munmap(boot, fmap);
+
+	return rdev_chain(fmrd, boot, offset, fmap_size);
+}
+
+int fmap_locate_area_as_rdev(const char *name, struct region_device *area)
+{
+	struct region ar;
+
+	if (fmap_locate_area(name, &ar))
+		return -1;
+
+	return boot_device_ro_subregion(&ar, area);
+}
+
+int fmap_locate_area(const char *name, struct region *ar)
+{
+	struct region_device fmrd;
+	size_t offset;
+
+	if (find_fmap_directory(&fmrd))
+		return -1;
+
+	/* Start reading the areas just after fmap header. */
+	offset = sizeof(struct fmap);
+
+	while (1) {
+		struct fmap_area *area;
+
+		area = rdev_mmap(&fmrd, offset, sizeof(*area));
+
+		if (area == NULL)
+			return -1;
+
+		if (strcmp((const char *)area->name, name)) {
+			rdev_munmap(&fmrd, area);
+			offset += sizeof(struct fmap_area);
+			continue;
+		}
+
+		printk(BIOS_DEBUG, "FMAP: area %s found\n", name);
+		printk(BIOS_DEBUG, "FMAP:   offset: %x\n", area->offset);
+		printk(BIOS_DEBUG, "FMAP:   size:   %d bytes\n", area->size);
+
+		ar->offset = area->offset;
+		ar->size = area->size;
+
+		rdev_munmap(&fmrd, area);
+
+		return 0;
+	}
+
+	printk(BIOS_DEBUG, "FMAP: area %s not found\n", name);
+
+	return -1;
+}