| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 54 | struct 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 */ |