1 /* 2 * Hexagon VM page table entry definitions 3 * 4 * Copyright (c) 2010-2011,2013 The Linux Foundation. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 and 8 * only version 2 as published by the Free Software Foundation. 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., 51 Franklin Street, Fifth Floor, Boston, MA 18 * 02110-1301, USA. 19 */ 20 21 #ifndef _ASM_VM_MMU_H 22 #define _ASM_VM_MMU_H 23 24 /* 25 * Shift, mask, and other constants for the Hexagon Virtual Machine 26 * page tables. 27 * 28 * Virtual machine MMU allows first-level entries to either be 29 * single-level lookup PTEs for very large pages, or PDEs pointing 30 * to second-level PTEs for smaller pages. If PTE is single-level, 31 * the least significant bits cannot be used as software bits to encode 32 * virtual memory subsystem information about the page, and that state 33 * must be maintained in some parallel data structure. 34 */ 35 36 /* S or Page Size field in PDE */ 37 #define __HVM_PDE_S (0x7 << 0) 38 #define __HVM_PDE_S_4KB 0 39 #define __HVM_PDE_S_16KB 1 40 #define __HVM_PDE_S_64KB 2 41 #define __HVM_PDE_S_256KB 3 42 #define __HVM_PDE_S_1MB 4 43 #define __HVM_PDE_S_4MB 5 44 #define __HVM_PDE_S_16MB 6 45 #define __HVM_PDE_S_INVALID 7 46 47 /* Masks for L2 page table pointer, as function of page size */ 48 #define __HVM_PDE_PTMASK_4KB 0xfffff000 49 #define __HVM_PDE_PTMASK_16KB 0xfffffc00 50 #define __HVM_PDE_PTMASK_64KB 0xffffff00 51 #define __HVM_PDE_PTMASK_256KB 0xffffffc0 52 #define __HVM_PDE_PTMASK_1MB 0xfffffff0 53 54 /* 55 * Virtual Machine PTE Bits/Fields 56 */ 57 #define __HVM_PTE_T (1<<4) 58 #define __HVM_PTE_U (1<<5) 59 #define __HVM_PTE_C (0x7<<6) 60 #define __HVM_PTE_CVAL(pte) (((pte) & __HVM_PTE_C) >> 6) 61 #define __HVM_PTE_R (1<<9) 62 #define __HVM_PTE_W (1<<10) 63 #define __HVM_PTE_X (1<<11) 64 65 /* 66 * Cache Attributes, to be shifted as necessary for virtual/physical PTEs 67 */ 68 69 #define __HEXAGON_C_WB 0x0 /* Write-back, no L2 */ 70 #define __HEXAGON_C_WT 0x1 /* Write-through, no L2 */ 71 #define __HEXAGON_C_UNC 0x6 /* Uncached memory */ 72 #if CONFIG_HEXAGON_ARCH_VERSION >= 2 73 #define __HEXAGON_C_DEV 0x4 /* Device register space */ 74 #else 75 #define __HEXAGON_C_DEV __HEXAGON_C_UNC 76 #endif 77 #define __HEXAGON_C_WT_L2 0x5 /* Write-through, with L2 */ 78 #define __HEXAGON_C_WB_L2 0x7 /* Write-back, with L2 */ 79 80 /* 81 * This can be overriden, but we're defaulting to the most aggressive 82 * cache policy, the better to find bugs sooner. 83 */ 84 85 #define CACHE_DEFAULT __HEXAGON_C_WB_L2 86 87 /* Masks for physical page address, as a function of page size */ 88 89 #define __HVM_PTE_PGMASK_4KB 0xfffff000 90 #define __HVM_PTE_PGMASK_16KB 0xffffc000 91 #define __HVM_PTE_PGMASK_64KB 0xffff0000 92 #define __HVM_PTE_PGMASK_256KB 0xfffc0000 93 #define __HVM_PTE_PGMASK_1MB 0xfff00000 94 95 /* Masks for single-level large page lookups */ 96 97 #define __HVM_PTE_PGMASK_4MB 0xffc00000 98 #define __HVM_PTE_PGMASK_16MB 0xff000000 99 100 /* 101 * "Big kernel page mappings" (see vm_init_segtable.S) 102 * are currently 16MB 103 */ 104 105 #define BIG_KERNEL_PAGE_SHIFT 24 106 #define BIG_KERNEL_PAGE_SIZE (1 << BIG_KERNEL_PAGE_SHIFT) 107 108 109 110 #endif /* _ASM_VM_MMU_H */ 111