Bring up FireSim tests

tests/blkdev.h

@@ -0,0 +1,38 @@
+#define BLKDEV_BASE 0x10015000
+#define BLKDEV_ADDR BLKDEV_BASE
+#define BLKDEV_OFFSET (BLKDEV_BASE + 8)
+#define BLKDEV_LEN (BLKDEV_BASE + 12)
+#define BLKDEV_WRITE (BLKDEV_BASE + 16)
+#define BLKDEV_REQUEST (BLKDEV_BASE + 17)
+#define BLKDEV_NREQUEST (BLKDEV_BASE + 18)
+#define BLKDEV_COMPLETE (BLKDEV_BASE + 19)
+#define BLKDEV_NCOMPLETE (BLKDEV_BASE + 20)
+#define BLKDEV_NSECTORS (BLKDEV_BASE + 24)
+#define BLKDEV_MAX_REQUEST_LENGTH (BLKDEV_BASE + 28)
+#define BLKDEV_SECTOR_SIZE 512
+#define BLKDEV_SECTOR_SHIFT 9
+
+static inline size_t blkdev_nsectors(void)
+{
+	return reg_read32(BLKDEV_NSECTORS);
+}
+
+static inline size_t blkdev_max_req_len(void)
+{
+	return reg_read32(BLKDEV_MAX_REQUEST_LENGTH);
+}
+
+static inline unsigned int blkdev_send_request(
+		unsigned long addr,
+		unsigned int offset, 
+		unsigned int len,
+		unsigned char write)
+{
+		reg_write64(BLKDEV_ADDR, addr);
+		reg_write32(BLKDEV_OFFSET, offset);
+		reg_write32(BLKDEV_LEN, len);
+		reg_write8(BLKDEV_WRITE, write);
+
+		asm volatile ("fence");
+		return reg_read8(BLKDEV_REQUEST);
+}