Large reorganization.

What was in core/ is now moved to arch/stm34l4xxx/peripherals.  This new
directory is *supposed to* to contain raw header files defining just the
pertinent register structures for the various peripherals.  Peripheral
management belongs somewhere in the new `kern/..` directories. This is
not completely the case at the moment, so more refactoring needs to be
done.

What was sitting in the root has now been moved into the kern/
directory. The kern/ directory is to contain everything else
other than raw device register definitions. The root of the kern/
tree is reserved for standard library-esque headers.

The kern/<peripheral> directory contains management systems for that
peripheral. (At the moment DMA is the only peripheral with a decent
management system.) Preferably these peripheral systems should only
include their correlating header in arch/stm34l4xxx/peripherals, and
use other management systems for handling other peripherals rather
than manipulating their raw registers directly. (Though this ideal
will require much more critical mass of management systems.)

1 files changed, 30 insertions, 0 deletions

diff --git a/02-usart/include/kern/mem.h b/02-usart/include/kern/mem.h
new file mode 100644
index 0000000..d150744
--- /dev/null
+++ b/02-usart/include/kern/mem.h
@@ -0,0 +1,30 @@
+#ifndef MEM_H_
+#define MEM_H_
+
+#include "arch.h"
+#include <stddef.h>
+
+#define DATA_SEGMENT_STOP_ADDR ((uint8_t*) &DATA_SEGMENT_STOP)
+#define DATA_SEGMENT_START_ADDR ((uint8_t*) &DATA_SEGMENT_START)
+
+#define MAX_HEAP_SIZE \
+  ((16384 - (DATA_SEGMENT_STOP_ADDR - DATA_SEGMENT_START_ADDR)) / 4 * 4)
+
+/* allocates memory on the head, which is stored in sram2 */
+void* halloc(size_t n);
+
+/* Frees the memory allocated by halloc. */
+void hfree(void* mem);
+
+#ifdef FOR_TESTING
+
+void* debug_halloc_get_next_ptr(void* ptr);
+
+void* debug_halloc_get_prev_ptr(void* ptr);
+
+int debug_halloc_assert_consistency(char* error, size_t len);
+
+#endif
+
+
+#endif