1 files changed, 101 insertions, 0 deletions
diff --git a/src/cpu/x86/car.c b/src/cpu/x86/car.c
new file mode 100644
index 0000000000..31fc67c57a
--- /dev/null
+++ b/src/cpu/x86/car.c
@@ -0,0 +1,101 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <string.h>
+#include <stddef.h>
+#include <console/console.h>
+#include <cbmem.h>
+#include <cpu/x86/car.h>
+
+typedef void (* const car_migration_func_t)(void);
+
+extern car_migration_func_t _car_migrate_start;
+extern car_migration_func_t _car_migrate_end;
+
+extern char _car_data_start[];
+extern char _car_data_end[];
+
+/*
+ * The car_migrated global variable determines if the cache-as-ram space has
+ * been migrated to real RAM. It does this by asumming the following things:
+ *   1. cache-as-ram space is zero'd out once it is set up.
+ *   2. Either the cache-as-ram space is memory-backed after getting torn down
+ *      or the space returns 0xff's for each byte read.
+ * Based on these 2 attributes there is the ability to tell when the
+ * cache-as-ram region has been migrated.
+ */
+static int car_migrated CAR_GLOBAL;
+
+
+void *car_get_var_ptr(void *var)
+{
+	char *migrated_base;
+	int offset;
+	void * _car_start = &_car_data_start;
+	void * _car_end = &_car_data_end;
+
+	/* If the cache-as-ram has not been migrated return the pointer
+	 * passed in. */
+	if (!car_migrated)
+		return var;
+
+	if (var < _car_start || var >= _car_end) {
+		printk(BIOS_ERR,
+		       "Requesting CAR variable outside of CAR region: %p\n",
+		       var);
+		return var;
+	}
+
+	migrated_base = cbmem_find(CBMEM_ID_CAR_GLOBALS);
+
+	if (migrated_base == NULL) {
+		printk(BIOS_ERR, "CAR: Could not find migration base!\n");
+		return var;
+	}
+
+	offset = (char *)var - (char *)_car_start;
+
+	return &migrated_base[offset];
+}
+
+void car_migrate_variables(void)
+{
+	void *migrated_base;
+	car_migration_func_t *migrate_func;
+	size_t car_data_size = &_car_data_end[0] - &_car_data_start[0];
+
+	migrated_base = cbmem_add(CBMEM_ID_CAR_GLOBALS, car_data_size);
+
+	if (migrated_base == NULL) {
+		printk(BIOS_ERR, "Could not migrate CAR data!\n");
+		return;
+	}
+
+	memcpy(migrated_base, &_car_data_start[0], car_data_size);
+
+	/* Mark that the data has been moved. */
+	car_migrated = ~0;
+
+	/* Call all the migration functions. */
+	migrate_func = &_car_migrate_start;
+	while (migrate_func != &_car_migrate_end) {
+		(*migrate_func)();
+		migrate_func++;
+	}
+}