Initial commit

tasks/mm0/include/shm.h

@@ -0,0 +1,35 @@
+#ifndef __SHM_H__
+#define __SHM_H__
+
+#include <l4/api/space.h>
+#include <l4/lib/list.h>
+#include <l4/macros.h>
+#include <l4lib/types.h>
+
+struct shm_descriptor {
+	int key;			/* IPC key supplied by user task */
+	l4id_t shmid;			/* SHM area id, allocated by mm0 */
+	struct list_head list;		/* SHM list, used by mm0 */
+	struct vm_file *owner;
+	void *shm_addr;			/* The virtual address for segment. */
+	unsigned long size;		/* Size of the area */
+	unsigned int flags;
+	int refcnt;
+};
+
+#define SHM_AREA_MAX			64	/* Up to 64 shm areas */
+
+/* Up to 10 pages per area, and at least 1 byte (implies 1 page) */
+#define SHM_SHMMIN			1
+#define SHM_SHMMAX			(PAGE_SIZE * 10)
+
+/*
+ * NOTE: This flags the unique shm vaddr pool. If its not globally unique
+ * and shm areas are cached, on ARMv5 cache aliasing occurs.
+ */
+#define SHM_DISJOINT_VADDR_POOL
+
+/* Initialises shared memory bookkeeping structures */
+void shm_init();
+
+#endif /* __SHM_H__ */