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1/*
2 * LparMap.h
3 * Copyright (C) 2001 Mike Corrigan IBM Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19#ifndef _LPARMAP_H
20#define _LPARMAP_H
21
22#include <asm/types.h>
23
24/* The iSeries hypervisor will set up mapping for one or more
25 * ESID/VSID pairs (in SLB/segment registers) and will set up
26 * mappings of one or more ranges of pages to VAs.
27 * We will have the hypervisor set up the ESID->VSID mapping
28 * for the four kernel segments (C-F). With shared processors,
29 * the hypervisor will clear all segment registers and reload
30 * these four whenever the processor is switched from one
31 * partition to another.
32 */
33
34/* The Vsid and Esid identified below will be used by the hypervisor
35 * to set up a memory mapping for part of the load area before giving
36 * control to the Linux kernel. The load area is 64 MB, but this must
37 * not attempt to map the whole load area. The Hashed Page Table may
38 * need to be located within the load area (if the total partition size
39 * is 64 MB), but cannot be mapped. Typically, this should specify
40 * to map half (32 MB) of the load area.
41 *
42 * The hypervisor will set up page table entries for the number of
43 * pages specified.
44 *
45 * In 32-bit mode, the hypervisor will load all four of the
46 * segment registers (identified by the low-order four bits of the
47 * Esid field. In 64-bit mode, the hypervisor will load one SLB
48 * entry to map the Esid to the Vsid.
49*/
50
51// Hypervisor initially maps 32MB of the load area
52#define HvPagesToMap 8192
53
54struct LparMap
55{
56 u64 xNumberEsids; // Number of ESID/VSID pairs (1)
57 u64 xNumberRanges; // Number of VA ranges to map (1)
58 u64 xSegmentTableOffs; // Page number within load area of seg table (0)
59 u64 xRsvd[5]; // Reserved (0)
60 u64 xKernelEsid; // Esid used to map kernel load (0x0C00000000)
61 u64 xKernelVsid; // Vsid used to map kernel load (0x0C00000000)
62 u64 xPages; // Number of pages to be mapped (8192)
63 u64 xOffset; // Offset from start of load area (0)
64 u64 xVPN; // Virtual Page Number (0x000C000000000000)
65};
66
67#endif /* _LPARMAP_H */