arch/arm64/include/asm/pgtable-prot.h

   1 /*
   2  * Copyright (C) 2016 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_PGTABLE_PROT_H
  17 #define __ASM_PGTABLE_PROT_H
  18
  19 #include <asm/memory.h>
  20 #include <asm/pgtable-hwdef.h>
  21
  22 #include <linux/const.h>
  23
  24 /*
  25  * Software defined PTE bits definition.
  26  */
  27 #define PTE_VALID               (_AT(pteval_t, 1) << 0)
  28 #define PTE_WRITE               (PTE_DBM)                /* same as DBM (51) */
  29 #define PTE_DIRTY               (_AT(pteval_t, 1) << 55)
  30 #define PTE_SPECIAL             (_AT(pteval_t, 1) << 56)
  31 #define PTE_PROT_NONE           (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */
  32
  33 #ifndef __ASSEMBLY__
  34
  35 #include <asm/pgtable-types.h>
  36
  37 #define _PROT_DEFAULT           (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
  38 #define _PROT_SECT_DEFAULT      (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
  39
  40 #define PTE_MAYBE_NG            (arm64_kernel_unmapped_at_el0() ? PTE_NG : 0)
  41 #define PMD_MAYBE_NG            (arm64_kernel_unmapped_at_el0() ? PMD_SECT_NG : 0)
  42
  43 #define PROT_DEFAULT            (_PROT_DEFAULT | PTE_MAYBE_NG)
  44 #define PROT_SECT_DEFAULT       (_PROT_SECT_DEFAULT | PMD_MAYBE_NG)
  45
  46 #define PROT_DEVICE_nGnRnE      (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE))
  47 #define PROT_DEVICE_nGnRE       (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE))
  48 #define PROT_NORMAL_NC          (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC))
  49 #define PROT_NORMAL_WT          (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_WT))
  50 #define PROT_NORMAL             (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL))
  51
  52 #define PROT_SECT_DEVICE_nGnRE  (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE))
  53 #define PROT_SECT_NORMAL        (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))
  54 #define PROT_SECT_NORMAL_EXEC   (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))
  55
  56 #define _PAGE_DEFAULT           (_PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL))
  57 #define _HYP_PAGE_DEFAULT       _PAGE_DEFAULT
  58
  59 #define PAGE_KERNEL             __pgprot(PROT_NORMAL)
  60 #define PAGE_KERNEL_RO          __pgprot((PROT_NORMAL & ~PTE_WRITE) | PTE_RDONLY)
  61 #define PAGE_KERNEL_ROX         __pgprot((PROT_NORMAL & ~(PTE_WRITE | PTE_PXN)) | PTE_RDONLY)
  62 #define PAGE_KERNEL_EXEC        __pgprot(PROT_NORMAL & ~PTE_PXN)
  63 #define PAGE_KERNEL_EXEC_CONT   __pgprot((PROT_NORMAL & ~PTE_PXN) | PTE_CONT)
  64
  65 #define PAGE_HYP                __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_HYP_XN)
  66 #define PAGE_HYP_EXEC           __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY)
  67 #define PAGE_HYP_RO             __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY | PTE_HYP_XN)
  68 #define PAGE_HYP_DEVICE         __pgprot(PROT_DEVICE_nGnRE | PTE_HYP)
  69
  70 #define PAGE_S2                 __pgprot(_PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY | PTE_S2_XN)
  71 #define PAGE_S2_DEVICE          __pgprot(_PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDONLY | PTE_S2_XN)
  72
  73 #define PAGE_NONE               __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN)
  74 #define PAGE_SHARED             __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
  75 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE)
  76 #define PAGE_READONLY           __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN)
  77 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN)
  78 #define PAGE_EXECONLY           __pgprot(_PAGE_DEFAULT | PTE_RDONLY | PTE_NG | PTE_PXN)
  79
  80 #define __P000  PAGE_NONE
  81 #define __P001  PAGE_READONLY
  82 #define __P010  PAGE_READONLY
  83 #define __P011  PAGE_READONLY
  84 #define __P100  PAGE_EXECONLY
  85 #define __P101  PAGE_READONLY_EXEC
  86 #define __P110  PAGE_READONLY_EXEC
  87 #define __P111  PAGE_READONLY_EXEC
  88
  89 #define __S000  PAGE_NONE
  90 #define __S001  PAGE_READONLY
  91 #define __S010  PAGE_SHARED
  92 #define __S011  PAGE_SHARED
  93 #define __S100  PAGE_EXECONLY
  94 #define __S101  PAGE_READONLY_EXEC
  95 #define __S110  PAGE_SHARED_EXEC
  96 #define __S111  PAGE_SHARED_EXEC
  97
  98 #endif /* __ASSEMBLY__ */
  99
 100 #endif /* __ASM_PGTABLE_PROT_H */