1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 Regents of the University of California 4 */ 5 6 #ifndef _ASM_RISCV_PGTABLE_BITS_H 7 #define _ASM_RISCV_PGTABLE_BITS_H 8 9 #define _PAGE_ACCESSED_OFFSET 6 10 11 #define _PAGE_PRESENT (1 << 0) 12 #define _PAGE_READ (1 << 1) /* Readable */ 13 #define _PAGE_WRITE (1 << 2) /* Writable */ 14 #define _PAGE_EXEC (1 << 3) /* Executable */ 15 #define _PAGE_USER (1 << 4) /* User */ 16 #define _PAGE_GLOBAL (1 << 5) /* Global */ 17 #define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */ 18 #define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */ 19 #define _PAGE_SOFT (3 << 8) /* Reserved for software */ 20 21 #define _PAGE_SPECIAL (1 << 8) /* RSW: 0x1 */ 22 23 #ifdef CONFIG_MEM_SOFT_DIRTY 24 25 /* ext_svrsw60t59b: bit 59 for soft-dirty tracking */ 26 #define _PAGE_SOFT_DIRTY \ 27 ((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \ 28 (1UL << 59) : 0) 29 /* 30 * Bit 3 is always zero for swap entry computation, so we 31 * can borrow it for swap page soft-dirty tracking. 32 */ 33 #define _PAGE_SWP_SOFT_DIRTY \ 34 ((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \ 35 _PAGE_EXEC : 0) 36 #else 37 #define _PAGE_SOFT_DIRTY 0 38 #define _PAGE_SWP_SOFT_DIRTY 0 39 #endif /* CONFIG_MEM_SOFT_DIRTY */ 40 41 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP 42 43 /* ext_svrsw60t59b: Bit(60) for uffd-wp tracking */ 44 #define _PAGE_UFFD_WP \ 45 ((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \ 46 (1UL << 60) : 0) 47 /* 48 * Bit 4 is not involved into swap entry computation, so we 49 * can borrow it for swap page uffd-wp tracking. 50 */ 51 #define _PAGE_SWP_UFFD_WP \ 52 ((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \ 53 _PAGE_USER : 0) 54 #else 55 #define _PAGE_UFFD_WP 0 56 #define _PAGE_SWP_UFFD_WP 0 57 #endif 58 59 #define _PAGE_TABLE _PAGE_PRESENT 60 61 /* 62 * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to 63 * distinguish them from swapped out pages 64 */ 65 #define _PAGE_PROT_NONE _PAGE_GLOBAL 66 67 /* Used for swap PTEs only. */ 68 #define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED 69 70 #define _PAGE_PFN_SHIFT 10 71 72 /* 73 * when all of R/W/X are zero, the PTE is a pointer to the next level 74 * of the page table; otherwise, it is a leaf PTE. 75 */ 76 #define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC) 77 78 #endif /* _ASM_RISCV_PGTABLE_BITS_H */ 79