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/*
* CRIS MMU constants and PTE layout
*/
#ifndef _CRIS_MMU_H
#define _CRIS_MMU_H
/* type used in struct mm to couple an MMU context to an active mm */
typedef unsigned int 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: 31-13 12-------4 3 2 1 0
* ________________________________________________
* | 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 */
/* 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 */
#endif
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