[PATCH v6 08/17] lib: add asm/page.h and virt_to_phys/phys_to_virt

[Andrew Jones <drjones@redhat.com>]

Signed-off-by: Andrew Jones <drjones@redhat.com>
---
 lib/asm-generic/io.h   | 13 +++++++++++++
 lib/asm-generic/page.h | 28 ++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 lib/asm-generic/page.h

diff --git a/lib/asm-generic/io.h b/lib/asm-generic/io.h
index f00f4d3e68fe1..a9939d3a5921f 100644
--- a/lib/asm-generic/io.h
+++ b/lib/asm-generic/io.h
@@ -10,6 +10,7 @@
  * This work is licensed under the terms of the GNU LGPL, version 2.
  */
 #include "libcflat.h"
+#include "asm/page.h"
 
 #ifndef __raw_readb
 static inline u8 __raw_readb(const volatile void *addr)
@@ -159,4 +160,16 @@ static inline void *ioremap(u64 phys_addr, size_t size __unused)
 }
 #endif
 
+#ifndef virt_to_phys
+static inline unsigned long virt_to_phys(volatile void *address)
+{
+	return __pa((unsigned long)address);
+}
+
+static inline void *phys_to_virt(unsigned long address)
+{
+	return __va(address);
+}
+#endif
+
 #endif /* _ASM_GENERIC_IO_H_ */
diff --git a/lib/asm-generic/page.h b/lib/asm-generic/page.h
new file mode 100644
index 0000000000000..559938fcf0b3f
--- /dev/null
+++ b/lib/asm-generic/page.h
@@ -0,0 +1,28 @@
+#ifndef _ASM_GENERIC_PAGE_H_
+#define _ASM_GENERIC_PAGE_H_
+/*
+ * asm-generic/page.h
+ *  adapted from the Linux kernel's include/asm-generic/page.h
+ *
+ * Copyright (C) 2014, Red Hat Inc, Andrew Jones <drjones@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.
+ */
+
+#define PAGE_SHIFT		12
+#ifndef __ASSEMBLY__
+#define PAGE_SIZE		(1UL << PAGE_SHIFT)
+#else
+#define PAGE_SIZE		(1 << PAGE_SHIFT)
+#endif
+#define PAGE_MASK		(~(PAGE_SIZE-1))
+#define PAGE_ALIGN(addr)	(((addr) + (PAGE_SIZE-1)) & PAGE_MASK)
+
+#ifndef __ASSEMBLY__
+#define __va(x)			((void *)((unsigned long) (x)))
+#define __pa(x)			((unsigned long) (x))
+#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
+#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
+#endif
+
+#endif
-- 
1.9.3