diff options
Diffstat (limited to 'arch/cris/include/arch-v32/arch/mmu.h')
| -rw-r--r-- | arch/cris/include/arch-v32/arch/mmu.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/arch/cris/include/arch-v32/arch/mmu.h b/arch/cris/include/arch-v32/arch/mmu.h new file mode 100644 index 000000000000..6bcdc3fdf7dc --- /dev/null +++ b/arch/cris/include/arch-v32/arch/mmu.h @@ -0,0 +1,111 @@ +#ifndef _ASM_CRIS_ARCH_MMU_H +#define _ASM_CRIS_ARCH_MMU_H + +/* MMU context type. */ +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 + +/* + * CRISv32 PTE bits: + * + * Bit: 31-13 12-5 4 3 2 1 0 + * +-----+------+--------+-------+--------+-------+---------+ + * | pfn | zero | global | valid | kernel | write | execute | + * +-----+------+--------+-------+--------+-------+---------+ + */ + +/* + * Defines for accessing the bits. Also define some synonyms for use with + * the software-based defined bits below. + */ +#define _PAGE_EXECUTE (1 << 0) /* Execution bit. */ +#define _PAGE_WE (1 << 1) /* Write bit. */ +#define _PAGE_SILENT_WRITE (1 << 1) /* Same as above. */ +#define _PAGE_KERNEL (1 << 2) /* Kernel mode page. */ +#define _PAGE_VALID (1 << 3) /* Page is valid. */ +#define _PAGE_SILENT_READ (1 << 3) /* Same as above. */ +#define _PAGE_GLOBAL (1 << 4) /* Global page. */ + +/* + * The hardware doesn't care about these bits, but the kernel uses them in + * software. + */ +#define _PAGE_PRESENT (1 << 5) /* Page is present in memory. */ +#define _PAGE_FILE (1 << 6) /* 1=pagecache, 0=swap (when !present) */ +#define _PAGE_ACCESSED (1 << 6) /* Simulated in software using valid bit. */ +#define _PAGE_MODIFIED (1 << 7) /* Simulated in software using we bit. */ +#define _PAGE_READ (1 << 8) /* Read enabled. */ +#define _PAGE_WRITE (1 << 9) /* 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_SHARED_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \ + _PAGE_ACCESSED | _PAGE_EXECUTE) + +#define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE) +#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE | _PAGE_ACCESSED) + +#define PAGE_COPY __pgprot(_PAGE_PRESENT | __READABLE) +#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE) +#define PAGE_KERNEL __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \ + _PAGE_PRESENT | __READABLE | __WRITEABLE) +#define PAGE_KERNEL_EXEC __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | _PAGE_EXECUTE | \ + _PAGE_PRESENT | __READABLE | __WRITEABLE) +#define PAGE_SIGNAL_TRAMPOLINE __pgprot(_PAGE_GLOBAL | _PAGE_EXECUTE | \ + _PAGE_PRESENT | __READABLE) + +#define _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL) + +/* CRISv32 can do page protection for execute. + * Write permissions imply read permissions. + * Note that the numbers are in Execute-Write-Read order! + */ +#define __P000 PAGE_NONE +#define __P001 PAGE_READONLY +#define __P010 PAGE_COPY +#define __P011 PAGE_COPY +#define __P100 PAGE_READONLY_EXEC +#define __P101 PAGE_READONLY_EXEC +#define __P110 PAGE_COPY_EXEC +#define __P111 PAGE_COPY_EXEC + +#define __S000 PAGE_NONE +#define __S001 PAGE_READONLY +#define __S010 PAGE_SHARED +#define __S011 PAGE_SHARED +#define __S100 PAGE_READONLY_EXEC +#define __S101 PAGE_READONLY_EXEC +#define __S110 PAGE_SHARED_EXEC +#define __S111 PAGE_SHARED_EXEC + +#define PTE_FILE_MAX_BITS 25 + +#endif /* _ASM_CRIS_ARCH_MMU_H */ |