kernel: vm: Add vnode pager

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

3 files changed, 102 insertions, 0 deletions

diff --git a/sys/include/vm/obj.h b/sys/include/vm/obj.h
new file mode 100644
index 0000000..d44454e
--- /dev/null
+++ b/sys/include/vm/obj.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * 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 Hyra 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 _VM_OBJ_H_
+#define _VM_OBJ_H_
+
+#include <sys/spinlock.h>
+#include <sys/types.h>
+#include <sys/vnode.h>
+#include <vm/map.h>
+#include <vm/pager.h>
+
+struct vm_object {
+    struct spinlock lock;           /* Protects this object */
+    struct vm_mapspace mapspace;    /* Mapspace this object points to */
+    struct vm_pagerops *pgops;      /* Pager operations */
+
+    uint8_t is_anon : 1;
+    struct vnode *vnode;
+};
+
+int vm_obj_init(struct vm_object **res, struct vnode *vnode);
+int vm_obj_destroy(struct vm_object *obj);
+
+#endif  /* !_VM_OBJ_H_ */
diff --git a/sys/include/vm/page.h b/sys/include/vm/page.h
index d1e89ea..80fa74f 100644
--- a/sys/include/vm/page.h
+++ b/sys/include/vm/page.h
@@ -32,6 +32,10 @@
 
 #include <sys/types.h>
 
+struct vm_page {
+    paddr_t physaddr;
+};
+
 void vm_zero_page(void *page, size_t page_count);
 
 #endif  /* !_VM_PAGE_H_ */
diff --git a/sys/include/vm/pager.h b/sys/include/vm/pager.h
new file mode 100644
index 0000000..5f36bfc
--- /dev/null
+++ b/sys/include/vm/pager.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * 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 Hyra 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 _VM_PAGER_H_
+#define _VM_PAGER_H_
+
+#include <sys/types.h>
+#include <vm/page.h>
+
+struct vm_object;
+
+struct vm_pagerops {
+    int(*get)(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg);
+    int(*store)(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg);
+};
+
+extern struct vm_pagerops g_vnode_pagerops;
+
+int vm_pager_get(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg);
+
+#endif  /* !_VM_PAGER_H_ */