projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * CRIS MMU constants and PTE layout | |
| 3 | */ | |
| 4 | ||
| 5 | #ifndef _CRIS_ARCH_MMU_H | |
| 6 | #define _CRIS_ARCH_MMU_H | |
| 7 | ||
| 8 | /* type used in struct mm to couple an MMU context to an active mm */ | |
| 9 | ||
| 10 | typedef unsigned int mm_context_t; | |
| 11 | ||
| 12 | /* kernel memory segments */ | |
| 13 | ||
| 14 | #define KSEG_F 0xf0000000UL | |
| 15 | #define KSEG_E 0xe0000000UL | |
| 16 | #define KSEG_D 0xd0000000UL | |
| 17 | #define KSEG_C 0xc0000000UL | |
| 18 | #define KSEG_B 0xb0000000UL | |
| 19 | #define KSEG_A 0xa0000000UL | |
| 20 | #define KSEG_9 0x90000000UL | |
| 21 | #define KSEG_8 0x80000000UL | |
| 22 | #define KSEG_7 0x70000000UL | |
| 23 | #define KSEG_6 0x60000000UL | |
| 24 | #define KSEG_5 0x50000000UL | |
| 25 | #define KSEG_4 0x40000000UL | |
| 26 | #define KSEG_3 0x30000000UL | |
| 27 | #define KSEG_2 0x20000000UL | |
| 28 | #define KSEG_1 0x10000000UL | |
| 29 | #define KSEG_0 0x00000000UL | |
| 30 | ||
| 31 | /* CRIS PTE bits (see R_TLB_LO in the register description) | |
| 32 | * | |
| 33 | * Bit: 31-13 12-------4 3 2 1 0 | |
| 34 | * ________________________________________________ | |
| 35 | * | pfn | reserved | global | valid | kernel | we | | |
| 36 | * |_____|__________|________|_______|________|_____| | |
| 37 | * | |
| 38 | * (pfn = physical frame number) | |
| 39 | */ | |
| 40 | ||
| 41 | /* Real HW-based PTE bits. We use some synonym names so that | |
| 42 | * things become less confusing in combination with the SW-based | |
| 43 | * bits further below. | |
| 44 | * | |
| 45 | */ | |
| 46 | ||
| 47 | #define _PAGE_WE (1<<0) /* page is write-enabled */ | |
| 48 | #define _PAGE_SILENT_WRITE (1<<0) /* synonym */ | |
| 49 | #define _PAGE_KERNEL (1<<1) /* page is kernel only */ | |
| 50 | #define _PAGE_VALID (1<<2) /* page is valid */ | |
| 51 | #define _PAGE_SILENT_READ (1<<2) /* synonym */ | |
| 52 | #define _PAGE_GLOBAL (1<<3) /* global page - context is ignored */ | |
| 53 | ||
| 54 | /* Bits the HW doesn't care about but the kernel uses them in SW */ | |
| 55 | ||
| 56 | #define _PAGE_PRESENT (1<<4) /* page present in memory */ | |
| 57 | #define _PAGE_FILE (1<<5) /* set: pagecache, unset: swap (when !PRESENT) */ | |
| 58 | #define _PAGE_ACCESSED (1<<5) /* simulated in software using valid bit */ | |
| 59 | #define _PAGE_MODIFIED (1<<6) /* simulated in software using we bit */ | |
| 60 | #define _PAGE_READ (1<<7) /* read-enabled */ | |
| 61 | #define _PAGE_WRITE (1<<8) /* write-enabled */ | |
| 62 | ||
| 63 | /* Define some higher level generic page attributes. */ | |
| 64 | ||
| 65 | #define __READABLE (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED) | |
| 66 | #define __WRITEABLE (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED) | |
| 67 | ||
| 68 | #define _PAGE_TABLE (_PAGE_PRESENT | __READABLE | __WRITEABLE) | |
| 69 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED) | |
| 70 | ||
| 71 | #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) | |
| 72 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \ | |
| 73 | _PAGE_ACCESSED) | |
| 74 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | __READABLE) // | _PAGE_COW | |
| 75 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE) | |
| 76 | #define PAGE_KERNEL __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \ | |
| 77 | _PAGE_PRESENT | __READABLE | __WRITEABLE) | |
| 78 | #define _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL) | |
| 79 | ||
| 80 | /* | |
| 81 | * CRIS can't do page protection for execute, and considers read the same. | |
| 82 | * Also, write permissions imply read permissions. This is the closest we can | |
| 83 | * get.. | |
| 84 | */ | |
| 85 | ||
| 86 | #define __P000 PAGE_NONE | |
| 87 | #define __P001 PAGE_READONLY | |
| 88 | #define __P010 PAGE_COPY | |
| 89 | #define __P011 PAGE_COPY | |
| 90 | #define __P100 PAGE_READONLY | |
| 91 | #define __P101 PAGE_READONLY | |
| 92 | #define __P110 PAGE_COPY | |
| 93 | #define __P111 PAGE_COPY | |
| 94 | ||
| 95 | #define __S000 PAGE_NONE | |
| 96 | #define __S001 PAGE_READONLY | |
| 97 | #define __S010 PAGE_SHARED | |
| 98 | #define __S011 PAGE_SHARED | |
| 99 | #define __S100 PAGE_READONLY | |
| 100 | #define __S101 PAGE_READONLY | |
| 101 | #define __S110 PAGE_SHARED | |
| 102 | #define __S111 PAGE_SHARED | |
| 103 | ||
| 104 | #define PTE_FILE_MAX_BITS 26 | |
| 105 | ||
| 106 | #endif |