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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.
*/
#define HvEsidsToMap 2
#define HvRangesToMap 1
/* Hypervisor initially maps 32MB of the load area */
#define HvPagesToMap 8192
struct LparMap {
u64 xNumberEsids; // Number of ESID/VSID pairs
u64 xNumberRanges; // Number of VA ranges to map
u64 xSegmentTableOffs; // Page number within load area of seg table
u64 xRsvd[5];
struct {
u64 xKernelEsid; // Esid used to map kernel load
u64 xKernelVsid; // Vsid used to map kernel load
} xEsids[HvEsidsToMap];
struct {
u64 xPages; // Number of pages to be mapped
u64 xOffset; // Offset from start of load area
u64 xVPN; // Virtual Page Number
} xRanges[HvRangesToMap];
};
extern struct LparMap xLparMap;
#endif /* _LPARMAP_H */
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