112 lines
4.0 KiB
C
112 lines
4.0 KiB
C
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#ifndef _ASM_CRIS_ARCH_MMU_H
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#define _ASM_CRIS_ARCH_MMU_H
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/* MMU context type. */
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typedef struct
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{
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unsigned int page_id;
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} mm_context_t;
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/* Kernel memory segments. */
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#define KSEG_F 0xf0000000UL
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#define KSEG_E 0xe0000000UL
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#define KSEG_D 0xd0000000UL
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#define KSEG_C 0xc0000000UL
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#define KSEG_B 0xb0000000UL
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#define KSEG_A 0xa0000000UL
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#define KSEG_9 0x90000000UL
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#define KSEG_8 0x80000000UL
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#define KSEG_7 0x70000000UL
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#define KSEG_6 0x60000000UL
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#define KSEG_5 0x50000000UL
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#define KSEG_4 0x40000000UL
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#define KSEG_3 0x30000000UL
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#define KSEG_2 0x20000000UL
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#define KSEG_1 0x10000000UL
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#define KSEG_0 0x00000000UL
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/*
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* CRISv32 PTE bits:
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*
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* Bit: 31-13 12-5 4 3 2 1 0
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* +-----+------+--------+-------+--------+-------+---------+
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* | pfn | zero | global | valid | kernel | write | execute |
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* +-----+------+--------+-------+--------+-------+---------+
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*/
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/*
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* Defines for accessing the bits. Also define some synonyms for use with
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* the software-based defined bits below.
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*/
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#define _PAGE_EXECUTE (1 << 0) /* Execution bit. */
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#define _PAGE_WE (1 << 1) /* Write bit. */
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#define _PAGE_SILENT_WRITE (1 << 1) /* Same as above. */
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#define _PAGE_KERNEL (1 << 2) /* Kernel mode page. */
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#define _PAGE_VALID (1 << 3) /* Page is valid. */
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#define _PAGE_SILENT_READ (1 << 3) /* Same as above. */
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#define _PAGE_GLOBAL (1 << 4) /* Global page. */
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/*
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* The hardware doesn't care about these bits, but the kernel uses them in
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* software.
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*/
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#define _PAGE_PRESENT (1 << 5) /* Page is present in memory. */
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#define _PAGE_FILE (1 << 6) /* 1=pagecache, 0=swap (when !present) */
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#define _PAGE_ACCESSED (1 << 6) /* Simulated in software using valid bit. */
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#define _PAGE_MODIFIED (1 << 7) /* Simulated in software using we bit. */
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#define _PAGE_READ (1 << 8) /* Read enabled. */
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#define _PAGE_WRITE (1 << 9) /* Write enabled. */
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/* Define some higher level generic page attributes. */
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#define __READABLE (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED)
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#define __WRITEABLE (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED)
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#define _PAGE_TABLE (_PAGE_PRESENT | __READABLE | __WRITEABLE)
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#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED)
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#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
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_PAGE_ACCESSED)
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#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
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_PAGE_ACCESSED | _PAGE_EXECUTE)
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE)
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#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE | _PAGE_ACCESSED)
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#define PAGE_COPY __pgprot(_PAGE_PRESENT | __READABLE)
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#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE)
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#define PAGE_KERNEL __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \
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_PAGE_PRESENT | __READABLE | __WRITEABLE)
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#define PAGE_KERNEL_EXEC __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | _PAGE_EXECUTE | \
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_PAGE_PRESENT | __READABLE | __WRITEABLE)
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#define PAGE_SIGNAL_TRAMPOLINE __pgprot(_PAGE_GLOBAL | _PAGE_EXECUTE | \
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_PAGE_PRESENT | __READABLE)
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#define _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL)
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/* CRISv32 can do page protection for execute.
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* Write permissions imply read permissions.
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* Note that the numbers are in Execute-Write-Read order!
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*/
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#define __P000 PAGE_NONE
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#define __P001 PAGE_READONLY
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#define __P010 PAGE_COPY
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#define __P011 PAGE_COPY
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#define __P100 PAGE_READONLY_EXEC
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#define __P101 PAGE_READONLY_EXEC
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#define __P110 PAGE_COPY_EXEC
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#define __P111 PAGE_COPY_EXEC
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#define __S000 PAGE_NONE
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#define __S001 PAGE_READONLY
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#define __S010 PAGE_SHARED
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#define __S011 PAGE_SHARED
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#define __S100 PAGE_READONLY_EXEC
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#define __S101 PAGE_READONLY_EXEC
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#define __S110 PAGE_SHARED_EXEC
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#define __S111 PAGE_SHARED_EXEC
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#define PTE_FILE_MAX_BITS 25
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#endif /* _ASM_CRIS_ARCH_MMU_H */
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