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| Commit | Line | Data |
|---|---|---|
| 51533b61 MS |
1 | #ifndef _ASM_CRIS_ARCH_MMU_H |
| 2 | #define _ASM_CRIS_ARCH_MMU_H | |
| 3 | ||
| 4 | /* MMU context type. */ | |
| 5 | typedef struct | |
| 6 | { | |
| 7 | unsigned int page_id; | |
| 8 | } mm_context_t; | |
| 9 | ||
| 10 | /* Kernel memory segments. */ | |
| 11 | #define KSEG_F 0xf0000000UL | |
| 12 | #define KSEG_E 0xe0000000UL | |
| 13 | #define KSEG_D 0xd0000000UL | |
| 14 | #define KSEG_C 0xc0000000UL | |
| 15 | #define KSEG_B 0xb0000000UL | |
| 16 | #define KSEG_A 0xa0000000UL | |
| 17 | #define KSEG_9 0x90000000UL | |
| 18 | #define KSEG_8 0x80000000UL | |
| 19 | #define KSEG_7 0x70000000UL | |
| 20 | #define KSEG_6 0x60000000UL | |
| 21 | #define KSEG_5 0x50000000UL | |
| 22 | #define KSEG_4 0x40000000UL | |
| 23 | #define KSEG_3 0x30000000UL | |
| 24 | #define KSEG_2 0x20000000UL | |
| 25 | #define KSEG_1 0x10000000UL | |
| 26 | #define KSEG_0 0x00000000UL | |
| 27 | ||
| 28 | /* | |
| 29 | * CRISv32 PTE bits: | |
| 30 | * | |
| 31 | * Bit: 31-13 12-5 4 3 2 1 0 | |
| 32 | * +-----+------+--------+-------+--------+-------+---------+ | |
| 33 | * | pfn | zero | global | valid | kernel | write | execute | | |
| 34 | * +-----+------+--------+-------+--------+-------+---------+ | |
| 35 | */ | |
| 36 | ||
| 37 | /* | |
| 38 | * Defines for accessing the bits. Also define some synonyms for use with | |
| 39 | * the software-based defined bits below. | |
| 40 | */ | |
| 41 | #define _PAGE_EXECUTE (1 << 0) /* Execution bit. */ | |
| 42 | #define _PAGE_WE (1 << 1) /* Write bit. */ | |
| 43 | #define _PAGE_SILENT_WRITE (1 << 1) /* Same as above. */ | |
| 44 | #define _PAGE_KERNEL (1 << 2) /* Kernel mode page. */ | |
| 45 | #define _PAGE_VALID (1 << 3) /* Page is valid. */ | |
| 46 | #define _PAGE_SILENT_READ (1 << 3) /* Same as above. */ | |
| 47 | #define _PAGE_GLOBAL (1 << 4) /* Global page. */ | |
| 48 | ||
| 49 | /* | |
| 50 | * The hardware doesn't care about these bits, but the kernel uses them in | |
| 51 | * software. | |
| 52 | */ | |
| 53 | #define _PAGE_PRESENT (1 << 5) /* Page is present in memory. */ | |
| 54 | #define _PAGE_FILE (1 << 6) /* 1=pagecache, 0=swap (when !present) */ | |
| 55 | #define _PAGE_ACCESSED (1 << 6) /* Simulated in software using valid bit. */ | |
| 56 | #define _PAGE_MODIFIED (1 << 7) /* Simulated in software using we bit. */ | |
| 57 | #define _PAGE_READ (1 << 8) /* Read enabled. */ | |
| 58 | #define _PAGE_WRITE (1 << 9) /* Write enabled. */ | |
| 59 | ||
| 60 | /* Define some higher level generic page attributes. */ | |
| 61 | #define __READABLE (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED) | |
| 62 | #define __WRITEABLE (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED) | |
| 63 | ||
| 64 | #define _PAGE_TABLE (_PAGE_PRESENT | __READABLE | __WRITEABLE) | |
| 65 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED) | |
| 66 | ||
| 67 | #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) | |
| 68 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \ | |
| 69 | _PAGE_ACCESSED) | |
| 70 | #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \ | |
| 71 | _PAGE_ACCESSED | _PAGE_EXECUTE) | |
| 72 | ||
| 73 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE) | |
| 74 | #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE | _PAGE_ACCESSED) | |
| 75 | ||
| 76 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | __READABLE) | |
| 77 | #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE) | |
| 78 | #define PAGE_KERNEL __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \ | |
| 79 | _PAGE_PRESENT | __READABLE | __WRITEABLE) | |
| 80 | #define PAGE_KERNEL_EXEC __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | _PAGE_EXECUTE | \ | |
| 81 | _PAGE_PRESENT | __READABLE | __WRITEABLE) | |
| 82 | #define PAGE_SIGNAL_TRAMPOLINE __pgprot(_PAGE_GLOBAL | _PAGE_EXECUTE | \ | |
| 83 | _PAGE_PRESENT | __READABLE) | |
| 84 | ||
| 85 | #define _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL) | |
| 86 | ||
| 87 | /* CRISv32 can do page protection for execute. | |
| 88 | * Write permissions imply read permissions. | |
| 89 | * Note that the numbers are in Execute-Write-Read order! | |
| 90 | */ | |
| 91 | #define __P000 PAGE_NONE | |
| 92 | #define __P001 PAGE_READONLY | |
| 93 | #define __P010 PAGE_COPY | |
| 94 | #define __P011 PAGE_COPY | |
| 95 | #define __P100 PAGE_READONLY_EXEC | |
| 96 | #define __P101 PAGE_READONLY_EXEC | |
| 97 | #define __P110 PAGE_COPY_EXEC | |
| 98 | #define __P111 PAGE_COPY_EXEC | |
| 99 | ||
| 100 | #define __S000 PAGE_NONE | |
| 101 | #define __S001 PAGE_READONLY | |
| 102 | #define __S010 PAGE_SHARED | |
| 103 | #define __S011 PAGE_SHARED | |
| 104 | #define __S100 PAGE_READONLY_EXEC | |
| 105 | #define __S101 PAGE_READONLY_EXEC | |
| 106 | #define __S110 PAGE_SHARED_EXEC | |
| 107 | #define __S111 PAGE_SHARED_EXEC | |
| 108 | ||
| 109 | #define PTE_FILE_MAX_BITS 25 | |
| 110 | ||
| 111 | #endif /* _ASM_CRIS_ARCH_MMU_H */ |