1 files changed, 108 insertions, 0 deletions

diff --git a/include/asm-ppc64/abs_addr.h b/include/asm-ppc64/abs_addr.h
new file mode 100644
index 000000000000..6d4e8e787058
--- /dev/null
+++ b/include/asm-ppc64/abs_addr.h
@@ -0,0 +1,108 @@
+#ifndef _ABS_ADDR_H
+#define _ABS_ADDR_H
+
+#include <linux/config.h>
+
+/*
+ * c 2001 PPC 64 Team, IBM Corp
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <asm/types.h>
+#include <asm/page.h>
+#include <asm/prom.h>
+#include <asm/lmb.h>
+
+typedef u32 msChunks_entry;
+struct msChunks {
+        unsigned long num_chunks;
+        unsigned long chunk_size;
+        unsigned long chunk_shift;
+        unsigned long chunk_mask;
+        msChunks_entry *abs;
+};
+
+extern struct msChunks msChunks;
+
+extern unsigned long msChunks_alloc(unsigned long, unsigned long, unsigned long);
+extern unsigned long reloc_offset(void);
+
+#ifdef CONFIG_MSCHUNKS
+
+static inline unsigned long
+chunk_to_addr(unsigned long chunk)
+{
+        unsigned long offset = reloc_offset();
+        struct msChunks *_msChunks = PTRRELOC(&msChunks);
+
+        return chunk << _msChunks->chunk_shift;
+}
+
+static inline unsigned long
+addr_to_chunk(unsigned long addr)
+{
+        unsigned long offset = reloc_offset();
+        struct msChunks *_msChunks = PTRRELOC(&msChunks);
+
+        return addr >> _msChunks->chunk_shift;
+}
+
+static inline unsigned long
+chunk_offset(unsigned long addr)
+{
+        unsigned long offset = reloc_offset();
+        struct msChunks *_msChunks = PTRRELOC(&msChunks);
+
+        return addr & _msChunks->chunk_mask;
+}
+
+static inline unsigned long
+abs_chunk(unsigned long pchunk)
+{
+        unsigned long offset = reloc_offset();
+        struct msChunks *_msChunks = PTRRELOC(&msChunks);
+        if ( pchunk >= _msChunks->num_chunks ) {
+                return pchunk;
+        }
+        return PTRRELOC(_msChunks->abs)[pchunk];
+}
+
+/* A macro so it can take pointers or unsigned long. */
+#define phys_to_abs(pa)                                              \
+        ({ unsigned long _pa = (unsigned long)(pa);                          \
+           chunk_to_addr(abs_chunk(addr_to_chunk(_pa))) + chunk_offset(_pa); \
+        })
+
+static inline unsigned long
+physRpn_to_absRpn(unsigned long rpn)
+{
+        unsigned long pa = rpn << PAGE_SHIFT;
+        unsigned long aa = phys_to_abs(pa);
+        return (aa >> PAGE_SHIFT);
+}
+
+/* A macro so it can take pointers or unsigned long. */
+#define abs_to_phys(aa) lmb_abs_to_phys((unsigned long)(aa))
+
+#else  /* !CONFIG_MSCHUNKS */
+
+#define chunk_to_addr(chunk) ((unsigned long)(chunk))
+#define addr_to_chunk(addr) (addr)
+#define chunk_offset(addr) (0)
+#define abs_chunk(pchunk) (pchunk)
+
+#define phys_to_abs(pa) (pa)
+#define physRpn_to_absRpn(rpn) (rpn)
+#define abs_to_phys(aa) (aa)
+
+#endif /* !CONFIG_MSCHUNKS */
+
+/* Convenience macros */
+#define virt_to_abs(va) phys_to_abs(__pa(va))
+#define abs_to_virt(aa) __va(abs_to_phys(aa))
+
+#endif /* _ABS_ADDR_H */