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488f84994c
Presently the LparMap, one of the structures the kernel shares with the legacy iSeries hypervisor has a fixed offset address in head.S. This patch changes this so the LparMap is a normally initialized structure, without fixed address. This allows us to use macros to compute some of the values in the structure, which wasn't previously possible because the assembler always uses signed-% which gets the wrong answers for the computations in question. Unfortunately, a gcc bug means that doing this requires another structure (hvReleaseData) to be initialized in asm instead of C, but on the whole the result is cleaner than before. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
77 lines
2.7 KiB
C
77 lines
2.7 KiB
C
/*
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* LparMap.h
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* Copyright (C) 2001 Mike Corrigan IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LPARMAP_H
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#define _LPARMAP_H
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#include <asm/types.h>
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/*
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* The iSeries hypervisor will set up mapping for one or more
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* ESID/VSID pairs (in SLB/segment registers) and will set up
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* mappings of one or more ranges of pages to VAs.
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* We will have the hypervisor set up the ESID->VSID mapping
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* for the four kernel segments (C-F). With shared processors,
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* the hypervisor will clear all segment registers and reload
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* these four whenever the processor is switched from one
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* partition to another.
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*/
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/* The Vsid and Esid identified below will be used by the hypervisor
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* to set up a memory mapping for part of the load area before giving
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* control to the Linux kernel. The load area is 64 MB, but this must
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* not attempt to map the whole load area. The Hashed Page Table may
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* need to be located within the load area (if the total partition size
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* is 64 MB), but cannot be mapped. Typically, this should specify
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* to map half (32 MB) of the load area.
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*
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* The hypervisor will set up page table entries for the number of
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* pages specified.
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*
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* In 32-bit mode, the hypervisor will load all four of the
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* segment registers (identified by the low-order four bits of the
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* Esid field. In 64-bit mode, the hypervisor will load one SLB
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* entry to map the Esid to the Vsid.
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*/
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#define HvEsidsToMap 2
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#define HvRangesToMap 1
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/* Hypervisor initially maps 32MB of the load area */
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#define HvPagesToMap 8192
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struct LparMap {
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u64 xNumberEsids; // Number of ESID/VSID pairs
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u64 xNumberRanges; // Number of VA ranges to map
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u64 xSegmentTableOffs; // Page number within load area of seg table
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u64 xRsvd[5];
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struct {
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u64 xKernelEsid; // Esid used to map kernel load
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u64 xKernelVsid; // Vsid used to map kernel load
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} xEsids[HvEsidsToMap];
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struct {
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u64 xPages; // Number of pages to be mapped
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u64 xOffset; // Offset from start of load area
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u64 xVPN; // Virtual Page Number
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} xRanges[HvRangesToMap];
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};
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extern struct LparMap xLparMap;
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#endif /* _LPARMAP_H */
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