1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/*
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* CRIS MMU constants and PTE layout
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*/
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#ifndef _CRIS_ARCH_MMU_H
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#define _CRIS_ARCH_MMU_H
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/* type used in struct mm to couple an MMU context to an active mm */
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typedef unsigned int 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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/* CRIS PTE bits (see R_TLB_LO in the register description)
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*
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* Bit: 31-13 12-------4 3 2 1 0
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* ________________________________________________
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* | pfn | reserved | global | valid | kernel | we |
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* |_____|__________|________|_______|________|_____|
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*
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* (pfn = physical frame number)
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*/
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/* Real HW-based PTE bits. We use some synonym names so that
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* things become less confusing in combination with the SW-based
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* bits further below.
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*
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*/
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#define _PAGE_WE (1<<0) /* page is write-enabled */
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#define _PAGE_SILENT_WRITE (1<<0) /* synonym */
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#define _PAGE_KERNEL (1<<1) /* page is kernel only */
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#define _PAGE_VALID (1<<2) /* page is valid */
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#define _PAGE_SILENT_READ (1<<2) /* synonym */
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#define _PAGE_GLOBAL (1<<3) /* global page - context is ignored */
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/* Bits the HW doesn't care about but the kernel uses them in SW */
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#define _PAGE_PRESENT (1<<4) /* page present in memory */
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#define _PAGE_FILE (1<<5) /* set: pagecache, unset: swap (when !PRESENT) */
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#define _PAGE_ACCESSED (1<<5) /* simulated in software using valid bit */
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#define _PAGE_MODIFIED (1<<6) /* simulated in software using we bit */
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#define _PAGE_READ (1<<7) /* read-enabled */
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#define _PAGE_WRITE (1<<8) /* 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_COPY __pgprot(_PAGE_PRESENT | __READABLE) // | _PAGE_COW
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE)
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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 _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL)
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/*
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* CRIS can't do page protection for execute, and considers read the same.
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* Also, write permissions imply read permissions. This is the closest we can
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* get..
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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
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#define __P101 PAGE_READONLY
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#define __P110 PAGE_COPY
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#define __P111 PAGE_COPY
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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
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#define __S101 PAGE_READONLY
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#define __S110 PAGE_SHARED
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#define __S111 PAGE_SHARED
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#define PTE_FILE_MAX_BITS 26
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#endif
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