1 files changed, 75 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/abs_addr.h b/arch/powerpc/include/asm/abs_addr.h
new file mode 100644
index 000000000000..98324c5a8286
--- /dev/null
+++ b/arch/powerpc/include/asm/abs_addr.h
@@ -0,0 +1,75 @@
+#ifndef _ASM_POWERPC_ABS_ADDR_H
+#define _ASM_POWERPC_ABS_ADDR_H
+#ifdef __KERNEL__
+
+
+/*
+ * 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 <linux/lmb.h>
+
+#include <asm/types.h>
+#include <asm/page.h>
+#include <asm/prom.h>
+#include <asm/firmware.h>
+
+struct mschunks_map {
+        unsigned long num_chunks;
+        unsigned long chunk_size;
+        unsigned long chunk_shift;
+        unsigned long chunk_mask;
+        u32 *mapping;
+};
+
+extern struct mschunks_map mschunks_map;
+
+/* Chunks are 256 KB */
+#define MSCHUNKS_CHUNK_SHIFT    (18)
+#define MSCHUNKS_CHUNK_SIZE     (1UL << MSCHUNKS_CHUNK_SHIFT)
+#define MSCHUNKS_OFFSET_MASK    (MSCHUNKS_CHUNK_SIZE - 1)
+
+static inline unsigned long chunk_to_addr(unsigned long chunk)
+{
+        return chunk << MSCHUNKS_CHUNK_SHIFT;
+}
+
+static inline unsigned long addr_to_chunk(unsigned long addr)
+{
+        return addr >> MSCHUNKS_CHUNK_SHIFT;
+}
+
+static inline unsigned long phys_to_abs(unsigned long pa)
+{
+        unsigned long chunk;
+
+        /* This is a no-op on non-iSeries */
+        if (!firmware_has_feature(FW_FEATURE_ISERIES))
+                return pa;
+
+        chunk = addr_to_chunk(pa);
+
+        if (chunk < mschunks_map.num_chunks)
+                chunk = mschunks_map.mapping[chunk];
+
+        return chunk_to_addr(chunk) + (pa & MSCHUNKS_OFFSET_MASK);
+}
+
+/* Convenience macros */
+#define virt_to_abs(va) phys_to_abs(__pa(va))
+#define abs_to_virt(aa) __va(aa)
+
+/*
+ * Converts Virtual Address to Real Address for
+ * Legacy iSeries Hypervisor calls
+ */
+#define iseries_hv_addr(virtaddr)       \
+        (0x8000000000000000 | virt_to_abs(virtaddr))
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_ABS_ADDR_H */