coreboot: introduce notion of bootmem for memory map at boot

The write_coreboot_table() in coreboot_table.c was already using
struct memrange for managing and building up the entries that
eventually go into the lb_memory table. Abstract that concept
out to a bootmem memory map. The bootmem concept can then be
used as a basis for loading payloads, for example.

Change-Id: I7edbbca6bbd0568f658fde39ca93b126cab88367
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/5302
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

src/include/bootmem.h

@@ -0,0 +1,48 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 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
+ */
+
+#ifndef BOOTMEM_H
+#define BOOTMEM_H
+
+#include <memrange.h>
+#include <stdint.h>
+#include <boot/coreboot_tables.h>
+
+/*
+ * Initialize the memory address space prior to payload loading. The bootmem
+ * serves as the source for the lb_mem table.
+ */
+void bootmem_init(void);
+
+/* Add a range of a given type to the bootmem address space. */
+void bootmem_add_range(uint64_t start, uint64_t size, uint32_t type);
+
+/* Write memory coreboot table. */
+void bootmem_write_memory_table(struct lb_memory *mem);
+
+/* Print current range map of boot memory. */
+void bootmem_dump_ranges(void);
+
+/* Return 1 if region targets usable RAM, 0 otherwise. */
+int bootmem_region_targets_usable_ram(uint64_t start, uint64_t size);
+
+/* Allocate a temporary buffer from the unused RAM areas. */
+void *bootmem_allocate_buffer(size_t size);
+
+#endif /* BOOTMEM_H */