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 10typedef struct 11{ 12 unsigned int page_id; 13} mm_context_t; 14 15/* kernel memory segments */ 16 17#define KSEG_F 0xf0000000UL 18#define KSEG_E 0xe0000000UL 19#define KSEG_D 0xd0000000UL 20#define KSEG_C 0xc0000000UL 21#define KSEG_B 0xb0000000UL 22#define KSEG_A 0xa0000000UL 23#define KSEG_9 0x90000000UL 24#define KSEG_8 0x80000000UL 25#define KSEG_7 0x70000000UL 26#define KSEG_6 0x60000000UL 27#define KSEG_5 0x50000000UL 28#define KSEG_4 0x40000000UL 29#define KSEG_3 0x30000000UL 30#define KSEG_2 0x20000000UL 31#define KSEG_1 0x10000000UL 32#define KSEG_0 0x00000000UL 33 34/* CRIS PTE bits (see R_TLB_LO in the register description) 35 * 36 * Bit: 31 30-13 12-------4 3 2 1 0 37 * _______________________________________________________ 38 * | cache |pfn | reserved | global | valid | kernel | we | 39 * |_______|____|__________|________|_______|________|_____| 40 * 41 * (pfn = physical frame number) 42 */ 43 44/* Real HW-based PTE bits. We use some synonym names so that 45 * things become less confusing in combination with the SW-based 46 * bits further below. 47 * 48 */ 49 50#define _PAGE_WE (1<<0) /* page is write-enabled */ 51#define _PAGE_SILENT_WRITE (1<<0) /* synonym */ 52#define _PAGE_KERNEL (1<<1) /* page is kernel only */ 53#define _PAGE_VALID (1<<2) /* page is valid */ 54#define _PAGE_SILENT_READ (1<<2) /* synonym */ 55#define _PAGE_GLOBAL (1<<3) /* global page - context is ignored */ 56#define _PAGE_NO_CACHE (1<<31) /* part of the uncached memory map */ 57 58/* Bits the HW doesn't care about but the kernel uses them in SW */ 59 60#define _PAGE_PRESENT (1<<4) /* page present in memory */ 61#define _PAGE_FILE (1<<5) /* set: pagecache, unset: swap (when !PRESENT) */ 62#define _PAGE_ACCESSED (1<<5) /* simulated in software using valid bit */ 63#define _PAGE_MODIFIED (1<<6) /* simulated in software using we bit */ 64#define _PAGE_READ (1<<7) /* read-enabled */ 65#define _PAGE_WRITE (1<<8) /* write-enabled */ 66 67/* Define some higher level generic page attributes. */ 68 69#define __READABLE (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED) 70#define __WRITEABLE (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED) 71 72#define _PAGE_TABLE (_PAGE_PRESENT | __READABLE | __WRITEABLE) 73#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED) 74 75#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) 76#define PAGE_SHARED __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \ 77 _PAGE_ACCESSED) 78#define PAGE_COPY __pgprot(_PAGE_PRESENT | __READABLE) // | _PAGE_COW 79#define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE) 80#define PAGE_KERNEL __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \ 81 _PAGE_PRESENT | __READABLE | __WRITEABLE) 82#define _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL) 83 84/* 85 * CRIS can't do page protection for execute, and considers read the same. 86 * Also, write permissions imply read permissions. This is the closest we can 87 * get.. 88 */ 89 90#define __P000 PAGE_NONE 91#define __P001 PAGE_READONLY 92#define __P010 PAGE_COPY 93#define __P011 PAGE_COPY 94#define __P100 PAGE_READONLY 95#define __P101 PAGE_READONLY 96#define __P110 PAGE_COPY 97#define __P111 PAGE_COPY 98 99#define __S000 PAGE_NONE 100#define __S001 PAGE_READONLY 101#define __S010 PAGE_SHARED 102#define __S011 PAGE_SHARED 103#define __S100 PAGE_READONLY 104#define __S101 PAGE_READONLY 105#define __S110 PAGE_SHARED 106#define __S111 PAGE_SHARED 107 108#define PTE_FILE_MAX_BITS 26 109 110#endif 111