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Diffstat (limited to '')
| -rw-r--r-- | arch/hexagon/include/asm/vm_mmu.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/vm_mmu.h b/arch/hexagon/include/asm/vm_mmu.h new file mode 100644 index 000000000..6fc29d9d5 --- /dev/null +++ b/arch/hexagon/include/asm/vm_mmu.h @@ -0,0 +1,110 @@ +/* + * Hexagon VM page table entry definitions + * + * Copyright (c) 2010-2011,2013 The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#ifndef _ASM_VM_MMU_H +#define _ASM_VM_MMU_H + +/* + * Shift, mask, and other constants for the Hexagon Virtual Machine + * page tables. + * + * Virtual machine MMU allows first-level entries to either be + * single-level lookup PTEs for very large pages, or PDEs pointing + * to second-level PTEs for smaller pages. If PTE is single-level, + * the least significant bits cannot be used as software bits to encode + * virtual memory subsystem information about the page, and that state + * must be maintained in some parallel data structure. + */ + +/* S or Page Size field in PDE */ +#define __HVM_PDE_S (0x7 << 0) +#define __HVM_PDE_S_4KB 0 +#define __HVM_PDE_S_16KB 1 +#define __HVM_PDE_S_64KB 2 +#define __HVM_PDE_S_256KB 3 +#define __HVM_PDE_S_1MB 4 +#define __HVM_PDE_S_4MB 5 +#define __HVM_PDE_S_16MB 6 +#define __HVM_PDE_S_INVALID 7 + +/* Masks for L2 page table pointer, as function of page size */ +#define __HVM_PDE_PTMASK_4KB 0xfffff000 +#define __HVM_PDE_PTMASK_16KB 0xfffffc00 +#define __HVM_PDE_PTMASK_64KB 0xffffff00 +#define __HVM_PDE_PTMASK_256KB 0xffffffc0 +#define __HVM_PDE_PTMASK_1MB 0xfffffff0 + +/* + * Virtual Machine PTE Bits/Fields + */ +#define __HVM_PTE_T (1<<4) +#define __HVM_PTE_U (1<<5) +#define __HVM_PTE_C (0x7<<6) +#define __HVM_PTE_CVAL(pte) (((pte) & __HVM_PTE_C) >> 6) +#define __HVM_PTE_R (1<<9) +#define __HVM_PTE_W (1<<10) +#define __HVM_PTE_X (1<<11) + +/* + * Cache Attributes, to be shifted as necessary for virtual/physical PTEs + */ + +#define __HEXAGON_C_WB 0x0 /* Write-back, no L2 */ +#define __HEXAGON_C_WT 0x1 /* Write-through, no L2 */ +#define __HEXAGON_C_UNC 0x6 /* Uncached memory */ +#if CONFIG_HEXAGON_ARCH_VERSION >= 2 +#define __HEXAGON_C_DEV 0x4 /* Device register space */ +#else +#define __HEXAGON_C_DEV __HEXAGON_C_UNC +#endif +#define __HEXAGON_C_WT_L2 0x5 /* Write-through, with L2 */ +#define __HEXAGON_C_WB_L2 0x7 /* Write-back, with L2 */ + +/* + * This can be overridden, but we're defaulting to the most aggressive + * cache policy, the better to find bugs sooner. + */ + +#define CACHE_DEFAULT __HEXAGON_C_WB_L2 + +/* Masks for physical page address, as a function of page size */ + +#define __HVM_PTE_PGMASK_4KB 0xfffff000 +#define __HVM_PTE_PGMASK_16KB 0xffffc000 +#define __HVM_PTE_PGMASK_64KB 0xffff0000 +#define __HVM_PTE_PGMASK_256KB 0xfffc0000 +#define __HVM_PTE_PGMASK_1MB 0xfff00000 + +/* Masks for single-level large page lookups */ + +#define __HVM_PTE_PGMASK_4MB 0xffc00000 +#define __HVM_PTE_PGMASK_16MB 0xff000000 + +/* + * "Big kernel page mappings" (see vm_init_segtable.S) + * are currently 16MB + */ + +#define BIG_KERNEL_PAGE_SHIFT 24 +#define BIG_KERNEL_PAGE_SIZE (1 << BIG_KERNEL_PAGE_SHIFT) + + + +#endif /* _ASM_VM_MMU_H */ |