1#ifndef _ASM_CRIS_ARCH_MMU_H 2#define _ASM_CRIS_ARCH_MMU_H 3 4/* MMU context type. */ 5typedef 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 30-13 12-5 4 3 2 1 0 32 * +-------+-----+------+--------+-------+--------+-------+---------+ 33 * | cache | 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#define _PAGE_NO_CACHE (1 << 31) /* part of the uncached memory map */ 49 50 51/* 52 * The hardware doesn't care about these bits, but the kernel uses them in 53 * software. 54 */ 55#define _PAGE_PRESENT (1 << 5) /* Page is present in memory. */ 56#define _PAGE_FILE (1 << 6) /* 1=pagecache, 0=swap (when !present) */ 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#define PTE_FILE_MAX_BITS 25 112 113#endif /* _ASM_CRIS_ARCH_MMU_H */ 114