[tyndur-devel] [PATCH 03/11] libc: page.h für arch/amd64

[Andreas Freimuth <m.nemo@xxxxxxx>]

Signed-off-by: Andreas Freimuth <m.nemo@xxxxxxx>
---
 src/include/arch/amd64/page.h |   69 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 69 insertions(+), 0 deletions(-)
 create mode 100644 src/include/arch/amd64/page.h

diff --git a/src/include/arch/amd64/page.h b/src/include/arch/amd64/page.h
new file mode 100644
index 0000000..1d4cb66
--- /dev/null
+++ b/src/include/arch/amd64/page.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2006-2011 The tyndur Project. All rights reserved.
+ *
+ * This code is derived from software contributed to the tyndur Project
+ * by Burkhard Weseloh.
+ *
+ * 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.
+ *
+ * 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 HOLDERS 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 _PAGE_H_
+#define _PAGE_H_
+
+#define PAGE_SHIFT 12
+#define PAGE_SIZE 0x1000
+// AMD64 beschränkt den Physikalischen Adressraum auf 52 Bit
+#define PAGE_MASK 0x000ffffffffff000L
+
+#define PAGE_MAP_LENGTH 512
+#define PAGE_MAP_SHIFT 39
+#define PAGE_MAP_INDEX(addr) ((uintptr_t)(addr) >> PAGE_MAP_SHIFT)
+
+#define PAGE_DIR_PTR_TABLE_LENGTH 512
+#define PAGE_DIR_PTR_TABLE_SHIFT 30
+#define PAGE_DIR_PTR_TABLE_INDEX(addr) \
+  (((uintptr_t)(addr) >> PAGE_DIR_PTR_TABLE_SHIFT) & (PAGE_DIR_PTR_TABLE_LENGTH - 1))
+
+#define PAGE_DIRECTORY_LENGTH 512
+#define PAGE_DIRECTORY_SHIFT 21
+#define PAGE_DIRECTORY_INDEX(addr) (              \
+    ((uintptr_t)(addr) >> PAGE_DIRECTORY_SHIFT) & \
+    (PAGE_DIRECTORY_LENGTH - 1))
+
+#define PAGE_TABLE_LENGTH 512
+#define PAGE_TABLE_SHIFT 12
+#define PAGE_TABLE_INDEX(addr) (((uintptr_t)(addr) >> PAGE_TABLE_SHIFT) & \
+    (PAGE_TABLE_LENGTH - 1))
+
+// Rundet eine Adresse auf das kleinste Vielfache von PAGE_SIZE > n auf
+#define PAGE_ALIGN_ROUND_UP(n) (((n) + ~PAGE_MASK) & PAGE_MASK)
+
+// Rundet eine Adresse auf das größte Vielfache von PAGE_SIZE < n ab
+#define PAGE_ALIGN_ROUND_DOWN(n) ((n) & PAGE_MASK)
+
+// Die Anzahl der Pages, die von n Bytes belegt werden.
+#define NUM_PAGES(n) (PAGE_ALIGN_ROUND_UP(n) >> PAGE_SHIFT)
+
+// Die Anzahl der Page Maps die für n Bytes benötigt werden.
+#define NUM_PAGE_MAPS(n) (((n) + (1L << PAGE_MAP_SHIFT) - 1) >> PAGE_MAP_SHIFT)
+
+#endif
-- 
1.7.3.4