kern: dms: Add initial DMS engine sources

The DMS engine handles performing I/O based on specific opcodes given to
it and drives the callback wrappers.

Signed-off-by: Ian Moffett <ian@osmora.org>

4 files changed, 70 insertions, 1 deletions

diff --git a/src/sys/include/compat/unix/syscall.h b/src/sys/include/compat/unix/syscall.h
index 13bd617..8b7e7d7 100644
--- a/src/sys/include/compat/unix/syscall.h
+++ b/src/sys/include/compat/unix/syscall.h
@@ -36,6 +36,7 @@
 #include <sys/syscall.h>
 #include <os/iotap.h>
 #include <os/reboot.h>
+#include <dms/dms.h>
 
 /*
  * Exit the current process - exit(2) syscall
@@ -75,7 +76,8 @@ scret_t(*g_unix_sctab[])(struct syscall_args *) = {
     [SYS_muxtap] = sys_muxtap,
     [SYS_getargv] = sys_getargv,
     [SYS_reboot]  = sys_reboot,
-    [SYS_waitpid] = sys_waitpid
+    [SYS_waitpid] = sys_waitpid,
+    [SYS_dmsio] = sys_dmsio
 };
 
 #endif  /* !_NEED_UNIX_SCTAB */
diff --git a/src/sys/include/dms/dms.h b/src/sys/include/dms/dms.h
index 06e78ac..8453723 100644
--- a/src/sys/include/dms/dms.h
+++ b/src/sys/include/dms/dms.h
@@ -30,6 +30,7 @@
 #ifndef _DMS_DMS_H_
 #define _DMS_DMS_H_
 
+#include <sys/syscall.h>
 #include <sys/queue.h>
 #include <sys/cdefs.h>
 #include <sys/types.h>
@@ -139,4 +140,9 @@ int dms_register(const char *name, struct dms_ops *ops, struct dms_disk **res);
  */
 struct dms_disk *dms_get(disk_id_t disk_id);
 
+/*
+ * Perform I/O on a disk
+ */
+scret_t sys_dmsio(struct syscall_args *scargs);
+
 #endif  /* !_DMS_DMS_H_ */
diff --git a/src/sys/include/sys/dms.h b/src/sys/include/sys/dms.h
new file mode 100644
index 0000000..7d80c33
--- /dev/null
+++ b/src/sys/include/sys/dms.h
@@ -0,0 +1,60 @@
+/*
+ * 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.
+ */
+
+#ifndef _SYS_DMS_H_
+#define _SYS_DMS_H_ 1
+
+#include <sys/types.h>
+#if !defined(_KERNEL)
+#include <stdint.h>
+#include <stddef.h>
+#endif  /* !_KERNEL */
+
+#define DMS_OPC_READ    0x00    /* Read from drive */
+#define DMS_OPC_WRITE   0x01    /* Write to drive */
+
+/*
+ * Represents data that can be sent between the
+ * DMS framework and certain user applications
+ *
+ * @id: ID of disk to operate on
+ * @opcode: Operation code
+ * @buf: Data buffer (direction depends on opcode)
+ * @offset: Offset to perform operation at (depends on opcode)
+ * @len: Length of buffer
+ */
+struct dms_frame {
+    uint16_t id;
+    uint8_t opcode;
+    void *buf;
+    off_t offset;
+    size_t len;
+};
+
+#endif  /* !_SYS_DMS_H_ */
diff --git a/src/sys/include/sys/syscall.h b/src/sys/include/sys/syscall.h
index ac03055..2ff6087 100644
--- a/src/sys/include/sys/syscall.h
+++ b/src/sys/include/sys/syscall.h
@@ -55,6 +55,7 @@
 #define SYS_getargv     0x0A    /* get process argv */
 #define SYS_reboot      0x0B    /* reboot the system */
 #define SYS_waitpid     0x0C    /* wait for child to exit */
+#define SYS_dmsio       0x0D    /* DMS I/O */
 
 typedef __ssize_t scret_t;
 typedef __ssize_t scarg_t;