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