kern: Add initial pirho compiler sources

The pirho compiler is a ring-0 compiler used to compile core parts of
the kernel during updates and installs from the initramfs.

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

3 files changed, 181 insertions, 2 deletions

diff --git a/src/sys/include/np/lex.h b/src/sys/include/np/lex.h
new file mode 100644
index 0000000..0b56490
--- /dev/null
+++ b/src/sys/include/np/lex.h
@@ -0,0 +1,101 @@
+/*
+ * 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 _NP_LEX_H_
+#define _NP_LEX_H_ 1
+
+#include <sys/types.h>
+#include <os/np.h>
+
+#define TOKEN_BEGIN "begin"
+#define TOKEN_PROC "proc"
+#define TOKEN_END "end"
+
+/*
+ * Represents the various token types that are
+ * possible
+ */
+typedef enum {
+    /* Symbols */
+    TT_LPAREN,
+    TT_RPAREN,
+
+    /* Keywords */
+    TT_BEGIN,
+    TT_PROC,
+    TT_END,
+} tt_t;
+
+/*
+ * Represents a lexer token
+ *
+ * @token: Token type
+ */
+struct lex_token {
+    tt_t token;
+};
+
+/*
+ * Represents the lexer state machine
+ *
+ * @work: Current compiler work unit
+ * @tok: Current token
+ * @source_idx: Byte index into source stream
+ */
+struct lexer_state {
+    struct np_work *work;
+    struct lex_token tok;
+    size_t source_idx;
+};
+
+/*
+ * Initialize the lexer state machine into
+ * a known state
+ *
+ * @state: Lexer state machine to initialize
+ * @work: Work to initialize state machine with
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value on failure
+ */
+int lex_init(struct lexer_state *state, struct np_work *work);
+
+/*
+ * "Nom" a token from the source input and advance
+ * to the next.
+ *
+ * @work: Current work
+ * @res: Result is written here
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value on failure
+ */
+int lex_nom(struct np_work *work, struct lex_token *res);
+
+#endif  /* !_NP_LEX_H_ */
diff --git a/src/sys/include/os/np.h b/src/sys/include/os/np.h
new file mode 100644
index 0000000..3083ee1
--- /dev/null
+++ b/src/sys/include/os/np.h
@@ -0,0 +1,78 @@
+/*
+ * 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.
+ */
+
+/*
+ * Description: Pirho compiler interface
+ * Author: Ian Marco Moffett
+ */
+
+#ifndef _OS_NP_H_
+#define _OS_NP_H_ 1
+
+#include <sys/types.h>
+#include <os/vnode.h>
+#include <np/lex.h>
+
+/*
+ * Compiler work
+ *
+ * @source: Source input file
+ * @source_size: Source size in bytes
+ * @line_no: Current line number
+ * @lex_st: Lexer state
+ */
+struct np_work {
+    char *source;
+    size_t source_size;
+    size_t line_no;
+    struct lexer_state lex_st;
+};
+
+/*
+ * Initializes the compiler state into known values
+ *
+ * @in_path: Input file path of sources to be compiled
+ * @workp: Resulting work data is written here
+ *
+ * Returns zero on success, otherwise a less than zero
+ * value on failure.
+ */
+int np_init(const char *in_path, struct np_work *workp);
+
+/*
+ * Complete work by compiling the input file
+ *
+ * @work: Work that will be compiled
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value on failure
+ */
+int np_compile(struct np_work *work);
+
+#endif /* _OS_NP_H_ */
diff --git a/src/sys/include/sys/namei.h b/src/sys/include/sys/namei.h
index 588dbd3..58307b1 100644
--- a/src/sys/include/sys/namei.h
+++ b/src/sys/include/sys/namei.h
@@ -38,12 +38,12 @@
  *
  * @path: Full path to lookup
  * @flags: Flags to use
- * @vp: Vnode result is written here
+ * @vp_res: Vnode result is written here
  */
 struct nameidata {
     const char *path;
     uint32_t flags;
-    struct vnode *vp;
+    struct vnode **vp_res;
 };
 
 #if defined(_KERNEL)