| /* |
| * CRIS MMU constants and PTE layout |
| */ |
| |
| #ifndef _CRIS_ARCH_MMU_H |
| #define _CRIS_ARCH_MMU_H |
| |
| /* type used in struct mm to couple an MMU context to an active mm */ |
| |
| typedef struct |
| { |
| unsigned int page_id; |
| } mm_context_t; |
| |
| /* kernel memory segments */ |
| |
| #define KSEG_F 0xf0000000UL |
| #define KSEG_E 0xe0000000UL |
| #define KSEG_D 0xd0000000UL |
| #define KSEG_C 0xc0000000UL |
| #define KSEG_B 0xb0000000UL |
| #define KSEG_A 0xa0000000UL |
| #define KSEG_9 0x90000000UL |
| #define KSEG_8 0x80000000UL |
| #define KSEG_7 0x70000000UL |
| #define KSEG_6 0x60000000UL |
| #define KSEG_5 0x50000000UL |
| #define KSEG_4 0x40000000UL |
| #define KSEG_3 0x30000000UL |
| #define KSEG_2 0x20000000UL |
| #define KSEG_1 0x10000000UL |
| #define KSEG_0 0x00000000UL |
| |
| /* CRIS PTE bits (see R_TLB_LO in the register description) |
| * |
| * Bit: 31 30-13 12-------4 3 2 1 0 |
| * _______________________________________________________ |
| * | cache |pfn | reserved | global | valid | kernel | we | |
| * |_______|____|__________|________|_______|________|_____| |
| * |
| * (pfn = physical frame number) |
| */ |
| |
| /* Real HW-based PTE bits. We use some synonym names so that |
| * things become less confusing in combination with the SW-based |
| * bits further below. |
| * |
| */ |
| |
| #define _PAGE_WE (1<<0) /* page is write-enabled */ |
| #define _PAGE_SILENT_WRITE (1<<0) /* synonym */ |
| #define _PAGE_KERNEL (1<<1) /* page is kernel only */ |
| #define _PAGE_VALID (1<<2) /* page is valid */ |
| #define _PAGE_SILENT_READ (1<<2) /* synonym */ |
| #define _PAGE_GLOBAL (1<<3) /* global page - context is ignored */ |
| #define _PAGE_NO_CACHE (1<<31) /* part of the uncached memory map */ |
| |
| /* Bits the HW doesn't care about but the kernel uses them in SW */ |
| |
| #define _PAGE_PRESENT (1<<4) /* page present in memory */ |
| #define _PAGE_ACCESSED (1<<5) /* simulated in software using valid bit */ |
| #define _PAGE_MODIFIED (1<<6) /* simulated in software using we bit */ |
| #define _PAGE_READ (1<<7) /* read-enabled */ |
| #define _PAGE_WRITE (1<<8) /* write-enabled */ |
| |
| /* Define some higher level generic page attributes. */ |
| |
| #define __READABLE (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED) |
| #define __WRITEABLE (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED) |
| |
| #define _PAGE_TABLE (_PAGE_PRESENT | __READABLE | __WRITEABLE) |
| #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED) |
| |
| #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) |
| #define PAGE_SHARED __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \ |
| _PAGE_ACCESSED) |
| #define PAGE_COPY __pgprot(_PAGE_PRESENT | __READABLE) // | _PAGE_COW |
| #define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE) |
| #define PAGE_KERNEL __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \ |
| _PAGE_PRESENT | __READABLE | __WRITEABLE) |
| #define _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL) |
| |
| /* |
| * CRIS can't do page protection for execute, and considers read the same. |
| * Also, write permissions imply read permissions. This is the closest we can |
| * get.. |
| */ |
| |
| #define __P000 PAGE_NONE |
| #define __P001 PAGE_READONLY |
| #define __P010 PAGE_COPY |
| #define __P011 PAGE_COPY |
| #define __P100 PAGE_READONLY |
| #define __P101 PAGE_READONLY |
| #define __P110 PAGE_COPY |
| #define __P111 PAGE_COPY |
| |
| #define __S000 PAGE_NONE |
| #define __S001 PAGE_READONLY |
| #define __S010 PAGE_SHARED |
| #define __S011 PAGE_SHARED |
| #define __S100 PAGE_READONLY |
| #define __S101 PAGE_READONLY |
| #define __S110 PAGE_SHARED |
| #define __S111 PAGE_SHARED |
| |
| #endif |
