coreboot: introduce commonlib

Instead of reaching into src/include and re-writing code
allow for cleaner code sharing within coreboot and its
utilities. The additional thing needed at this point is
for the utilities to provide a printk() declaration within
a <console/console.h> file. That way code which uses printk()
can than be mapped properly to verbosity of utility parameters.

Change-Id: I9e46a279569733336bc0a018aed96bc924c07cdd
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11592
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/src/commonlib/mem_pool.c b/src/commonlib/mem_pool.c
new file mode 100644
index 0000000000..a7292f3036
--- /dev/null
+++ b/src/commonlib/mem_pool.c
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 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 <commonlib/mem_pool.h>
+#include <stdlib.h>
+
+void *mem_pool_alloc(struct mem_pool *mp, size_t sz)
+{
+	void *p;
+
+	/* Make all allocations be at least 8 byte aligned. */
+	sz = ALIGN_UP(sz, 8);
+
+	/* Determine if any space available. */
+	if ((mp->size - mp->free_offset) < sz)
+		return NULL;
+
+	p = &mp->buf[mp->free_offset];
+
+	mp->free_offset += sz;
+	mp->last_alloc = p;
+
+	return p;
+}
+
+void mem_pool_free(struct mem_pool *mp, void *p)
+{
+	/* Determine if p was the most recent allocation. */
+	if (p == NULL || mp->last_alloc != p)
+		return;
+
+	mp->free_offset = mp->last_alloc - mp->buf;
+	/* No way to track allocation before this one. */
+	mp->last_alloc = NULL;
+}