1 files changed, 106 insertions, 0 deletions
diff --git a/src/sys/dms/dms_engine.c b/src/sys/dms/dms_engine.c
new file mode 100644
index 0000000..35388cc
--- /dev/null
+++ b/src/sys/dms/dms_engine.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/dms.h>
+#include <os/systm.h>
+#include <os/kalloc.h>
+#include <dms/dms.h>
+
+static ssize_t
+dms_io(struct dms_frame *dfp)
+{
+    struct dms_disk *dp;
+    size_t len;
+    ssize_t retval = -ENXIO;
+    int error;
+    void *kbuf;
+
+    if (dfp == NULL) {
+        return -EINVAL;
+    }
+
+    if ((len = dfp->len) == 0) {
+        return -EINVAL;
+    }
+
+    if ((dp = dms_get(dfp->id)) == NULL) {
+        return -ENODEV;
+    }
+
+    if ((kbuf = kalloc(dfp->len)) == NULL) {
+        return -ENOMEM;
+    }
+
+    switch (dfp->opcode) {
+    case DMS_OPC_READ:
+        retval = dms_read(dp, kbuf, dfp->offset, dfp->len);
+        if (retval < 0) {
+            break;
+        }
+        error = copyout(kbuf, dfp->buf, dfp->len);
+        if (error < 0) {
+            retval = error;
+            break;
+        }
+        break;
+    case DMS_OPC_WRITE:
+        error = copyin(dfp->buf, kbuf, dfp->len);
+        if (error < 0) {
+            retval = error;
+            break;
+        }
+
+        retval = dms_write(dp, kbuf, dfp->offset, dfp->len);
+        break;
+    }
+
+    kfree(kbuf);
+    return retval;
+}
+
+/*
+ * ARG0: DMS frame pointer
+ */
+scret_t
+sys_dmsio(struct syscall_args *scargs)
+{
+    struct dms_frame *u_dfp = SCARG(scargs, struct dms_frame *, 0);
+    struct dms_frame df;
+    int error;
+
+    error = copyin(u_dfp, &df, sizeof(df));
+    if (error < 0) {
+        return error;
+    }
+
+    return dms_io(&df);
+}