From 059b2450fb71520e9d0ee1e26dd5bb48c9b6ddf7 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 6 Oct 2025 17:46:47 -0400
Subject: kern: syscall: Add SYS_mount syscall

This commit introduces the system call for mounting filesystems. As of
now, only the fstype and target params are supported

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 src/sys/include/compat/unix/syscall.h |  4 +++-
 src/sys/include/sys/mount.h           | 31 +++++++++++++++++++++++--------
 src/sys/include/sys/syscall.h         |  1 +
 3 files changed, 27 insertions(+), 9 deletions(-)

(limited to 'src/sys/include')

diff --git a/src/sys/include/compat/unix/syscall.h b/src/sys/include/compat/unix/syscall.h
index ab464c4..5339d47 100644
--- a/src/sys/include/compat/unix/syscall.h
+++ b/src/sys/include/compat/unix/syscall.h
@@ -32,6 +32,7 @@
 
 #include <sys/proc.h>
 #include <sys/param.h>
+#include <sys/mount.h>
 #include <sys/syscall.h>
 
 /*
@@ -61,7 +62,8 @@ scret_t(*g_unix_sctab[])(struct syscall_args *) = {
     [SYS_write]  = sys_write,
     [SYS_cross]  = sys_cross,
     [SYS_query]  = sys_query,
-    [SYS_spawn]  = sys_spawn
+    [SYS_spawn]  = sys_spawn,
+    [SYS_mount]  = sys_mount
 };
 
 #endif  /* !_NEED_UNIX_SCTAB */
diff --git a/src/sys/include/sys/mount.h b/src/sys/include/sys/mount.h
index 4e39279..6d041ee 100644
--- a/src/sys/include/sys/mount.h
+++ b/src/sys/include/sys/mount.h
@@ -31,22 +31,32 @@
 #define _SYS_MOUNT_H_
 
 #include <sys/queue.h>
+#include <sys/syscall.h>
 #include <sys/types.h>
+#if defined(_KERNEL)
 #include <os/vnode.h>
+#endif /* defined(_KERNEL) */
 
-#if defined(_KERNEL)
+/*
+ * Mount filesystem string names
+ */
+#define MOUNT_INITRD "initrd"   /* Initial ramdisk */
+#define MOUNT_DEVFS  "devfs"    /* Device filesystem */
 
 /*
- * Number of bytes allowed in a filesystem
- * name including the null termination
+ * The mount system call
  */
-#define FSNAME_MAX 16
+int mount(
+    const char *source, const char *target, const char *fstype,
+    unsigned long mountflags, void *data
+);
 
+#if defined(_KERNEL)
 /*
- * Mount filesystem string names
+ * Number of bytes allowed in a filesystem
+ * name including the null termination
  */
-#define MOUNT_INITRD "initrd"   /* Initial ramdisk */
-#define MOUNT_DEVFS  "devfs"    /* Device filesystem */
+#define FSNAME_MAX 16
 
 /* Forward declarations */
 struct fs_info;
@@ -155,7 +165,7 @@ int mount_lookup(const char *name, struct mount **mp_res);
  * Returns zero on success, otherwise a less than zero
  * failure upon failure.
  */
-int mount(struct mount_args *margs, uint32_t flags);
+int kmount(struct mount_args *margs, uint32_t flags);
 
 /*
  * Initialize a mountpoint to a known state
@@ -178,5 +188,10 @@ int mountlist_init(struct mountlist *mlp);
  */
 int mount_alloc(const char *name, struct mount **mp_res);
 
+/*
+ * Mount system call
+ */
+scret_t sys_mount(struct syscall_args *scargs);
+
 #endif  /* !_KERNEL */
 #endif  /* !_SYS_MOUNT_H_ */
diff --git a/src/sys/include/sys/syscall.h b/src/sys/include/sys/syscall.h
index c1c06bb..4121d54 100644
--- a/src/sys/include/sys/syscall.h
+++ b/src/sys/include/sys/syscall.h
@@ -49,6 +49,7 @@
 #define SYS_sigaction   0x04
 #define SYS_query       0x05    /* query a border (mandatory) */
 #define SYS_spawn       0x06    /* spawn a process */
+#define SYS_mount       0x07    /* mount a filesystem */
 
 typedef __ssize_t scret_t;
 typedef __ssize_t scarg_t;
-- 
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