1cbd15b3fSLey Foon Tan /* 2cbd15b3fSLey Foon Tan * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> 3cbd15b3fSLey Foon Tan * Copyright (C) 2009 Wind River Systems Inc 4cbd15b3fSLey Foon Tan * 5cbd15b3fSLey Foon Tan * This file is subject to the terms and conditions of the GNU General Public 6cbd15b3fSLey Foon Tan * License. See the file "COPYING" in the main directory of this archive 7cbd15b3fSLey Foon Tan * for more details. 8cbd15b3fSLey Foon Tan */ 9cbd15b3fSLey Foon Tan 10cbd15b3fSLey Foon Tan #ifndef _ASM_NIOS2_PGTABLE_BITS_H 11cbd15b3fSLey Foon Tan #define _ASM_NIOS2_PGTABLE_BITS_H 12cbd15b3fSLey Foon Tan 13cbd15b3fSLey Foon Tan /* 14cbd15b3fSLey Foon Tan * These are actual hardware defined protection bits in the tlbacc register 15cbd15b3fSLey Foon Tan * which looks like this: 16cbd15b3fSLey Foon Tan * 17cbd15b3fSLey Foon Tan * 31 30 ... 26 25 24 23 22 21 20 19 18 ... 1 0 18cbd15b3fSLey Foon Tan * ignored........ C R W X G PFN............ 19cbd15b3fSLey Foon Tan */ 20cbd15b3fSLey Foon Tan #define _PAGE_GLOBAL (1<<20) 21cbd15b3fSLey Foon Tan #define _PAGE_EXEC (1<<21) 22cbd15b3fSLey Foon Tan #define _PAGE_WRITE (1<<22) 23cbd15b3fSLey Foon Tan #define _PAGE_READ (1<<23) 24cbd15b3fSLey Foon Tan #define _PAGE_CACHED (1<<24) /* C: data access cacheable */ 25cbd15b3fSLey Foon Tan 26cbd15b3fSLey Foon Tan /* 27cbd15b3fSLey Foon Tan * Software defined bits. They are ignored by the hardware and always read back 28cbd15b3fSLey Foon Tan * as zero, but can be written as non-zero. 29cbd15b3fSLey Foon Tan */ 30cbd15b3fSLey Foon Tan #define _PAGE_PRESENT (1<<25) /* PTE contains a translation */ 31cbd15b3fSLey Foon Tan #define _PAGE_ACCESSED (1<<26) /* page referenced */ 32cbd15b3fSLey Foon Tan #define _PAGE_DIRTY (1<<27) /* dirty page */ 33cbd15b3fSLey Foon Tan 34*4d1d955fSDavid Hildenbrand /* We borrow bit 31 to store the exclusive marker in swap PTEs. */ 35*4d1d955fSDavid Hildenbrand #define _PAGE_SWP_EXCLUSIVE (1<<31) 36*4d1d955fSDavid Hildenbrand 37cbd15b3fSLey Foon Tan #endif /* _ASM_NIOS2_PGTABLE_BITS_H */ 38