kern: Add initial object namespace sources

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

2 files changed, 143 insertions, 0 deletions

diff --git a/src/sys/include/os/ns.h b/src/sys/include/os/ns.h
new file mode 100644
index 0000000..3253c86
--- /dev/null
+++ b/src/sys/include/os/ns.h
@@ -0,0 +1,88 @@
+/*
+ * 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 _OS_NS_H_
+#define _OS_NS_H_
+
+#include <sys/types.h>
+
+struct ns_obj;
+typedef uint8_t ns_t;
+
+/*
+ * Initializes an object into a known state so that
+ * further operations can be performed
+ *
+ * @nsop: Newly created object to be initialized
+ *
+ * Returns a value of zero on success, otherwise a less
+ * than zero value upon failure.
+ */
+int ns_obj_init(struct ns_obj *nsop);
+
+/*
+ * Place an object into the namespace
+ *
+ * @ns: ID of the namespace to enter object
+ * @obj: Object that we want to enter
+ * @name: Name of the object
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value on failure
+ */
+int ns_obj_enter(ns_t ns, void *obj, const char *name);
+
+/*
+ * Find an object within a namespace
+ *
+ * @ns: ID of namespace to lookup
+ * @name: Name of object we want to find
+ * @res_p: Pointer of result pointer to store
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value on failure.
+ */
+int ns_obj_lookup(ns_t ns, const char *name, void *res_p);
+
+/*
+ * Unifies the buffer / callback interface into a single
+ * function, used to read an object's data into a buffer
+ * by length.
+ *
+ * @nsop: Object to read from
+ * @buf: Buffer to read into
+ * @off: Offset to read at
+ * @len: Length of bytes to read
+ *
+ * Returns the length of the data read on success, otherwise
+ * a less than zero value upon failure.
+ */
+ssize_t ns_obj_read(struct ns_obj *nsop, void *buf, off_t off, size_t len);
+
+#endif  /* !_OS_NS_H_ */
diff --git a/src/sys/include/os/nsvar.h b/src/sys/include/os/nsvar.h
new file mode 100644
index 0000000..96bc6b7
--- /dev/null
+++ b/src/sys/include/os/nsvar.h
@@ -0,0 +1,55 @@
+/*
+ * 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 _OS_NSVAR_H_
+#define _OS_NSVAR_H_ 1
+
+#include <sys/types.h>
+
+/*
+ * Represents a namespace object
+ *
+ * @read: Read callack of this object
+ * @data: Data this object references
+ * @len: Length of the underlying data
+ * @refcount: Reference count to keep track
+ *
+ * XXX: 'data' is optional and can be NULL. if such is the case,
+ *       read() should not be NULL
+ */
+struct ns_obj {
+    ssize_t(*read)(struct ns_obj *nsop, void *buf, size_t len);
+    void *data;
+    const size_t len;
+    int refcount;
+};
+
+int ns_init(void);
+
+#endif  /* !_OS_NSVAR_H_ */