GSoC/Buflib: Add buflib memory alocator to the core.

The buflib memory allocator is handle based and can free and
compact, move or resize memory on demand. This allows to effeciently
allocate memory dynamically without an MMU, by avoiding fragmentation
through memory compaction.

This patch adds the buflib library to the core, along with
convinience wrappers to omit the context parameter. Compaction is
not yet enabled, but will be in a later patch. Therefore, this acts as a
replacement for buffer_alloc/buffer_get_buffer() with the benifit of a debug
menu.

See buflib.h for some API documentation.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30380 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 57 insertions, 0 deletions

diff --git a/firmware/core_alloc.c b/firmware/core_alloc.c
new file mode 100644
index 0000000000..75dfc75b86
--- /dev/null
+++ b/firmware/core_alloc.c
@@ -0,0 +1,57 @@
+
+#include <string.h>
+#include "core_alloc.h"
+#include "buflib.h"
+#include "buffer.h"
+
+/* not static so it can be discovered by core_get_data() */
+struct buflib_context core_ctx;
+
+void core_allocator_init(void)
+{
+    buffer_init();
+    size_t size;
+    void *start = buffer_get_buffer(&size);
+    buflib_init(&core_ctx, start, size);
+    buffer_release_buffer(size);
+}
+
+int core_alloc(const char* name, size_t size)
+{
+    return buflib_alloc_ex(&core_ctx, size, name, NULL);
+}
+
+int core_alloc_ex(const char* name, size_t size, struct buflib_callbacks *ops)
+{
+    return buflib_alloc_ex(&core_ctx, size, name, ops);
+}
+
+size_t core_available(void)
+{
+    return buflib_available(&core_ctx);
+}
+
+int core_free(int handle)
+{
+    return buflib_free(&core_ctx, handle);
+}
+
+int core_alloc_maximum(const char* name, size_t *size, struct buflib_callbacks *ops)
+{
+    return buflib_alloc_maximum(&core_ctx, name, size, ops);
+}
+
+bool core_shrink(int handle, void* new_start, size_t new_size)
+{
+    return buflib_shrink(&core_ctx, handle, new_start, new_size);
+}
+
+int core_get_num_blocks(void)
+{
+    return buflib_get_num_blocks(&core_ctx);
+}
+
+void core_print_block_at(int block_num, char* buf, size_t bufsize)
+{
+    buflib_print_block_at(&core_ctx, block_num, buf, bufsize);
+}