111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
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/*
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* Hexagon VM page table entry definitions
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*
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* Copyright (c) 2010-2011,2013 The Linux Foundation. All rights reserved.
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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 version 2 and
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* only version 2 as published by the Free Software Foundation.
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef _ASM_VM_MMU_H
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#define _ASM_VM_MMU_H
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/*
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* Shift, mask, and other constants for the Hexagon Virtual Machine
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* page tables.
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*
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* Virtual machine MMU allows first-level entries to either be
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* single-level lookup PTEs for very large pages, or PDEs pointing
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* to second-level PTEs for smaller pages. If PTE is single-level,
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* the least significant bits cannot be used as software bits to encode
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* virtual memory subsystem information about the page, and that state
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* must be maintained in some parallel data structure.
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*/
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/* S or Page Size field in PDE */
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#define __HVM_PDE_S (0x7 << 0)
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#define __HVM_PDE_S_4KB 0
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#define __HVM_PDE_S_16KB 1
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#define __HVM_PDE_S_64KB 2
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#define __HVM_PDE_S_256KB 3
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#define __HVM_PDE_S_1MB 4
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#define __HVM_PDE_S_4MB 5
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#define __HVM_PDE_S_16MB 6
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#define __HVM_PDE_S_INVALID 7
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/* Masks for L2 page table pointer, as function of page size */
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#define __HVM_PDE_PTMASK_4KB 0xfffff000
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#define __HVM_PDE_PTMASK_16KB 0xfffffc00
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#define __HVM_PDE_PTMASK_64KB 0xffffff00
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#define __HVM_PDE_PTMASK_256KB 0xffffffc0
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#define __HVM_PDE_PTMASK_1MB 0xfffffff0
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/*
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* Virtual Machine PTE Bits/Fields
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*/
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#define __HVM_PTE_T (1<<4)
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#define __HVM_PTE_U (1<<5)
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#define __HVM_PTE_C (0x7<<6)
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#define __HVM_PTE_CVAL(pte) (((pte) & __HVM_PTE_C) >> 6)
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#define __HVM_PTE_R (1<<9)
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#define __HVM_PTE_W (1<<10)
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#define __HVM_PTE_X (1<<11)
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/*
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* Cache Attributes, to be shifted as necessary for virtual/physical PTEs
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*/
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#define __HEXAGON_C_WB 0x0 /* Write-back, no L2 */
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#define __HEXAGON_C_WT 0x1 /* Write-through, no L2 */
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#define __HEXAGON_C_UNC 0x6 /* Uncached memory */
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#if CONFIG_HEXAGON_ARCH_VERSION >= 2
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#define __HEXAGON_C_DEV 0x4 /* Device register space */
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#else
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#define __HEXAGON_C_DEV __HEXAGON_C_UNC
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#endif
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#define __HEXAGON_C_WT_L2 0x5 /* Write-through, with L2 */
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#define __HEXAGON_C_WB_L2 0x7 /* Write-back, with L2 */
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/*
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* This can be overridden, but we're defaulting to the most aggressive
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* cache policy, the better to find bugs sooner.
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*/
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#define CACHE_DEFAULT __HEXAGON_C_WB_L2
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/* Masks for physical page address, as a function of page size */
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#define __HVM_PTE_PGMASK_4KB 0xfffff000
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#define __HVM_PTE_PGMASK_16KB 0xffffc000
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#define __HVM_PTE_PGMASK_64KB 0xffff0000
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#define __HVM_PTE_PGMASK_256KB 0xfffc0000
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#define __HVM_PTE_PGMASK_1MB 0xfff00000
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/* Masks for single-level large page lookups */
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#define __HVM_PTE_PGMASK_4MB 0xffc00000
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#define __HVM_PTE_PGMASK_16MB 0xff000000
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/*
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* "Big kernel page mappings" (see vm_init_segtable.S)
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* are currently 16MB
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*/
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#define BIG_KERNEL_PAGE_SHIFT 24
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#define BIG_KERNEL_PAGE_SIZE (1 << BIG_KERNEL_PAGE_SHIFT)
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#endif /* _ASM_VM_MMU_H */
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