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/* $Id: pgtsun4c.h,v 1.1.1.1 2001-09-10 07:44:43 simons Exp $

 * pgtsun4c.h:  Sun4c specific pgtable.h defines and code.

 *

 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)

 */

#ifndef _SPARC_PGTSUN4C_H

#define _SPARC_PGTSUN4C_H

/* PMD_SHIFT determines the size of the area a second-level page table can map */

#define SUN4C_PMD_SHIFT       22

#define SUN4C_PMD_SIZE        (1UL << SUN4C_PMD_SHIFT)

#define SUN4C_PMD_MASK        (~(SUN4C_PMD_SIZE-1))

#define SUN4C_PMD_ALIGN(addr) (((addr)+SUN4C_PMD_SIZE-1)&SUN4C_PMD_MASK)

/* PGDIR_SHIFT determines what a third-level page table entry can map */

#define SUN4C_PGDIR_SHIFT       22

#define SUN4C_PGDIR_SIZE        (1UL << SUN4C_PGDIR_SHIFT)

#define SUN4C_PGDIR_MASK        (~(SUN4C_PGDIR_SIZE-1))

#define SUN4C_PGDIR_ALIGN(addr) (((addr)+SUN4C_PGDIR_SIZE-1)&SUN4C_PGDIR_MASK)

/* To represent how the sun4c mmu really lays things out. */

#define SUN4C_REAL_PGDIR_SHIFT       18

#define SUN4C_REAL_PGDIR_SIZE        (1UL << SUN4C_REAL_PGDIR_SHIFT)

#define SUN4C_REAL_PGDIR_MASK        (~(SUN4C_REAL_PGDIR_SIZE-1))

#define SUN4C_REAL_PGDIR_ALIGN(addr) (((addr)+SUN4C_REAL_PGDIR_SIZE-1)&SUN4C_REAL_PGDIR_MASK)

/*

 * To be efficient, and not have to worry about allocating such

 * a huge pgd, we make the kernel sun4c tables each hold 1024

 * entries and the pgd similarly just like the i386 tables.

 */

#define SUN4C_PTRS_PER_PTE    1024

#define SUN4C_PTRS_PER_PMD    1

#define SUN4C_PTRS_PER_PGD    1024

/* On the sun4c the physical ram limit is 128MB.  We set up our I/O

 * translations at KERNBASE + 128MB for 1MB, then we begin the VMALLOC

 * area, makes sense.  This works out to the value below.

 */

#define SUN4C_VMALLOC_START   (0xfe200000)

/*

 * Sparc SUN4C pte fields.

 */

#define _SUN4C_PAGE_VALID     0x80000000   /* valid page */

#define _SUN4C_PAGE_WRITE     0x40000000   /* can be written to */

#define _SUN4C_PAGE_PRIV      0x20000000   /* bit to signify privileged page */

#define _SUN4C_PAGE_USER      0x00000000   /* User page */

#define _SUN4C_PAGE_NOCACHE   0x10000000   /* non-cacheable page */

#define _SUN4C_PAGE_IO        0x04000000   /* I/O page */

#define _SUN4C_PAGE_REF       0x02000000   /* Page has been accessed/referenced */

#define _SUN4C_PAGE_DIRTY     0x01000000   /* Page has been modified, is dirty */

#define _SUN4C_PAGE_CHG_MASK  (0xffff | _SUN4C_PAGE_REF | _SUN4C_PAGE_DIRTY)

#define SUN4C_PAGE_NONE     __pgprot(_SUN4C_PAGE_VALID | _SUN4C_PAGE_PRIV | \

                                     _SUN4C_PAGE_REF)

#define SUN4C_PAGE_SHARED   __pgprot(_SUN4C_PAGE_VALID | _SUN4C_PAGE_WRITE | \

                                     _SUN4C_PAGE_USER | _SUN4C_PAGE_REF)

#define SUN4C_PAGE_COPY     __pgprot(_SUN4C_PAGE_VALID | _SUN4C_PAGE_USER | \

                                     _SUN4C_PAGE_REF)

#define SUN4C_PAGE_READONLY __pgprot(_SUN4C_PAGE_VALID | _SUN4C_PAGE_USER | \

                                     _SUN4C_PAGE_REF)

#define SUN4C_PAGE_KERNEL   __pgprot(_SUN4C_PAGE_VALID | _SUN4C_PAGE_WRITE | \

                                     _SUN4C_PAGE_PRIV | _SUN4C_PAGE_DIRTY | \

                                     _SUN4C_PAGE_REF | _SUN4C_PAGE_NOCACHE)

extern __inline__ unsigned long sun4c_get_synchronous_error(void)

{

        unsigned long sync_err;

        __asm__ __volatile__("lda [%1] %2, %0\n\t" :

                             "=r" (sync_err) :

                             "r" (AC_SYNC_ERR), "i" (ASI_CONTROL));

        return sync_err;

}

extern __inline__ unsigned long sun4c_get_synchronous_address(void)

{

        unsigned long sync_addr;

        __asm__ __volatile__("lda [%1] %2, %0\n\t" :

                             "=r" (sync_addr) :

                             "r" (AC_SYNC_VA), "i" (ASI_CONTROL));

        return sync_addr;

}

/* SUN4C pte, segmap, and context manipulation */

extern __inline__ unsigned long sun4c_get_segmap(unsigned long addr)

{

  register unsigned long entry;

  __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :

                       "=r" (entry) :

                       "r" (addr), "i" (ASI_SEGMAP));

  return entry;

}

extern __inline__ void sun4c_put_segmap(unsigned long addr, unsigned long entry)

{

  __asm__ __volatile__("\n\tstba %1, [%0] %2\n\t" : :

                       "r" (addr), "r" (entry),

                       "i" (ASI_SEGMAP));

  return;

}

extern __inline__ unsigned long sun4c_get_pte(unsigned long addr)

{

  register unsigned long entry;

  __asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" :

                       "=r" (entry) :

                       "r" (addr), "i" (ASI_PTE));

  return entry;

}

extern __inline__ void sun4c_put_pte(unsigned long addr, unsigned long entry)

{

  __asm__ __volatile__("\n\tsta %1, [%0] %2\n\t" : :

                       "r" (addr),

                       "r" (entry), "i" (ASI_PTE));

  return;

}

extern __inline__ int sun4c_get_context(void)

{

  register int ctx;

  __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :

                       "=r" (ctx) :

                       "r" (AC_CONTEXT), "i" (ASI_CONTROL));

  return ctx;

}

extern __inline__ int sun4c_set_context(int ctx)

{

  __asm__ __volatile__("\n\tstba %0, [%1] %2\n\t" : :

                       "r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL));

  return ctx;

}

#endif /* !(_SPARC_PGTSUN4C_H) */