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+/*
+ * LparMap.h
+ * Copyright (C) 2001 Mike Corrigan IBM Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#ifndef _LPARMAP_H
+#define _LPARMAP_H
+
+#include <asm/types.h>
+
+/* The iSeries hypervisor will set up mapping for one or more
+ * ESID/VSID pairs (in SLB/segment registers) and will set up
+ * mappings of one or more ranges of pages to VAs.
+ * We will have the hypervisor set up the ESID->VSID mapping
+ * for the four kernel segments (C-F). With shared processors,
+ * the hypervisor will clear all segment registers and reload
+ * these four whenever the processor is switched from one
+ * partition to another.
+ */
+
+/* The Vsid and Esid identified below will be used by the hypervisor
+ * to set up a memory mapping for part of the load area before giving
+ * control to the Linux kernel. The load area is 64 MB, but this must
+ * not attempt to map the whole load area. The Hashed Page Table may
+ * need to be located within the load area (if the total partition size
+ * is 64 MB), but cannot be mapped. Typically, this should specify
+ * to map half (32 MB) of the load area.
+ *
+ * The hypervisor will set up page table entries for the number of
+ * pages specified.
+ *
+ * In 32-bit mode, the hypervisor will load all four of the
+ * segment registers (identified by the low-order four bits of the
+ * Esid field. In 64-bit mode, the hypervisor will load one SLB
+ * entry to map the Esid to the Vsid.
+*/
+
+// Hypervisor initially maps 32MB of the load area
+#define HvPagesToMap 8192
+
+struct LparMap
+{
+ u64 xNumberEsids; // Number of ESID/VSID pairs (1)
+ u64 xNumberRanges; // Number of VA ranges to map (1)
+ u64 xSegmentTableOffs; // Page number within load area of seg table (0)
+ u64 xRsvd[5]; // Reserved (0)
+ u64 xKernelEsid; // Esid used to map kernel load (0x0C00000000)
+ u64 xKernelVsid; // Vsid used to map kernel load (0x0C00000000)
+ u64 xPages; // Number of pages to be mapped (8192)
+ u64 xOffset; // Offset from start of load area (0)
+ u64 xVPN; // Virtual Page Number (0x000C000000000000)
+};
+
+#endif /* _LPARMAP_H */
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