1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_CRIS_ARCH_MMU_H 3 #define _ASM_CRIS_ARCH_MMU_H 4 5 /* MMU context type. */ 6 typedef struct 7 { 8 unsigned int page_id; 9 } mm_context_t; 10 11 /* Kernel memory segments. */ 12 #define KSEG_F 0xf0000000UL 13 #define KSEG_E 0xe0000000UL 14 #define KSEG_D 0xd0000000UL 15 #define KSEG_C 0xc0000000UL 16 #define KSEG_B 0xb0000000UL 17 #define KSEG_A 0xa0000000UL 18 #define KSEG_9 0x90000000UL 19 #define KSEG_8 0x80000000UL 20 #define KSEG_7 0x70000000UL 21 #define KSEG_6 0x60000000UL 22 #define KSEG_5 0x50000000UL 23 #define KSEG_4 0x40000000UL 24 #define KSEG_3 0x30000000UL 25 #define KSEG_2 0x20000000UL 26 #define KSEG_1 0x10000000UL 27 #define KSEG_0 0x00000000UL 28 29 /* 30 * CRISv32 PTE bits: 31 * 32 * Bit: 31 30-13 12-5 4 3 2 1 0 33 * +-------+-----+------+--------+-------+--------+-------+---------+ 34 * | cache | pfn | zero | global | valid | kernel | write | execute | 35 * +-------+-----+------+--------+-------+--------+-------+---------+ 36 */ 37 38 /* 39 * Defines for accessing the bits. Also define some synonyms for use with 40 * the software-based defined bits below. 41 */ 42 #define _PAGE_EXECUTE (1 << 0) /* Execution bit. */ 43 #define _PAGE_WE (1 << 1) /* Write bit. */ 44 #define _PAGE_SILENT_WRITE (1 << 1) /* Same as above. */ 45 #define _PAGE_KERNEL (1 << 2) /* Kernel mode page. */ 46 #define _PAGE_VALID (1 << 3) /* Page is valid. */ 47 #define _PAGE_SILENT_READ (1 << 3) /* Same as above. */ 48 #define _PAGE_GLOBAL (1 << 4) /* Global page. */ 49 #define _PAGE_NO_CACHE (1 << 31) /* part of the uncached memory map */ 50 51 52 /* 53 * The hardware doesn't care about these bits, but the kernel uses them in 54 * software. 55 */ 56 #define _PAGE_PRESENT (1 << 5) /* Page is present in memory. */ 57 #define _PAGE_ACCESSED (1 << 6) /* Simulated in software using valid bit. */ 58 #define _PAGE_MODIFIED (1 << 7) /* Simulated in software using we bit. */ 59 #define _PAGE_READ (1 << 8) /* Read enabled. */ 60 #define _PAGE_WRITE (1 << 9) /* Write enabled. */ 61 62 /* Define some higher level generic page attributes. */ 63 #define __READABLE (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED) 64 #define __WRITEABLE (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED) 65 66 #define _PAGE_TABLE (_PAGE_PRESENT | __READABLE | __WRITEABLE) 67 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED) 68 69 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) 70 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \ 71 _PAGE_ACCESSED) 72 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \ 73 _PAGE_ACCESSED | _PAGE_EXECUTE) 74 75 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE) 76 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE | _PAGE_ACCESSED) 77 78 #define PAGE_COPY __pgprot(_PAGE_PRESENT | __READABLE) 79 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE) 80 #define PAGE_KERNEL __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \ 81 _PAGE_PRESENT | __READABLE | __WRITEABLE) 82 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | _PAGE_EXECUTE | \ 83 _PAGE_PRESENT | __READABLE | __WRITEABLE) 84 #define PAGE_SIGNAL_TRAMPOLINE __pgprot(_PAGE_GLOBAL | _PAGE_EXECUTE | \ 85 _PAGE_PRESENT | __READABLE) 86 87 #define _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL) 88 89 /* CRISv32 can do page protection for execute. 90 * Write permissions imply read permissions. 91 * Note that the numbers are in Execute-Write-Read order! 92 */ 93 #define __P000 PAGE_NONE 94 #define __P001 PAGE_READONLY 95 #define __P010 PAGE_COPY 96 #define __P011 PAGE_COPY 97 #define __P100 PAGE_READONLY_EXEC 98 #define __P101 PAGE_READONLY_EXEC 99 #define __P110 PAGE_COPY_EXEC 100 #define __P111 PAGE_COPY_EXEC 101 102 #define __S000 PAGE_NONE 103 #define __S001 PAGE_READONLY 104 #define __S010 PAGE_SHARED 105 #define __S011 PAGE_SHARED 106 #define __S100 PAGE_READONLY_EXEC 107 #define __S101 PAGE_READONLY_EXEC 108 #define __S110 PAGE_SHARED_EXEC 109 #define __S111 PAGE_SHARED_EXEC 110 111 #endif /* _ASM_CRIS_ARCH_MMU_H */ 112