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/* $Id: pgtsrmmu.h,v 1.1 2005-12-20 11:32:11 jcastillo Exp $

 * pgtsrmmu.h:  SRMMU page table defines and code.

 *

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

 */

#ifndef _SPARC_PGTSRMMU_H

#define _SPARC_PGTSRMMU_H

#include <linux/config.h>

#include <asm/page.h>

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

#define SRMMU_PMD_SHIFT         18

#define SRMMU_PMD_SIZE          (1UL << SRMMU_PMD_SHIFT)

#define SRMMU_PMD_MASK          (~(SRMMU_PMD_SIZE-1))

#define SRMMU_PMD_ALIGN(addr)   (((addr)+SRMMU_PMD_SIZE-1)&SRMMU_PMD_MASK)

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

#define SRMMU_PGDIR_SHIFT       24

#define SRMMU_PGDIR_SIZE        (1UL << SRMMU_PGDIR_SHIFT)

#define SRMMU_PGDIR_MASK        (~(SRMMU_PGDIR_SIZE-1))

#define SRMMU_PGDIR_ALIGN(addr) (((addr)+SRMMU_PGDIR_SIZE-1)&SRMMU_PGDIR_MASK)

#define SRMMU_PTRS_PER_PTE      64

#define SRMMU_PTRS_PER_PMD      64

#define SRMMU_PTRS_PER_PGD      256

#define SRMMU_PTE_TABLE_SIZE    0x100 /* 64 entries, 4 bytes a piece */

#define SRMMU_PMD_TABLE_SIZE    0x100 /* 64 entries, 4 bytes a piece */

#define SRMMU_PGD_TABLE_SIZE    0x400 /* 256 entries, 4 bytes a piece */

#define SRMMU_VMALLOC_START   (0xfe200000)

/* Definition of the values in the ET field of PTD's and PTE's */

#define SRMMU_ET_MASK         0x3

#define SRMMU_ET_INVALID      0x0

#define SRMMU_ET_PTD          0x1

#define SRMMU_ET_PTE          0x2

#define SRMMU_ET_REPTE        0x3 /* AIEEE, SuperSparc II reverse endian page! */

/* Physical page extraction from PTP's and PTE's. */

#define SRMMU_CTX_PMASK    0xfffffff0

#define SRMMU_PTD_PMASK    0xfffffff0

#define SRMMU_PTE_PMASK    0xffffff00

/* The pte non-page bits.  Some notes:

 * 1) cache, dirty, valid, and ref are frobbable

 *    for both supervisor and user pages.

 * 2) exec and write will only give the desired effect

 *    on user pages

 * 3) use priv and priv_readonly for changing the

 *    characteristics of supervisor ptes

 */

#define SRMMU_CACHE        0x80

#define SRMMU_DIRTY        0x40

#define SRMMU_REF          0x20

#define SRMMU_EXEC         0x08

#define SRMMU_WRITE        0x04

#define SRMMU_VALID        0x02 /* SRMMU_ET_PTE */

#define SRMMU_PRIV         0x1c

#define SRMMU_PRIV_RDONLY  0x18

#define SRMMU_CHG_MASK    (SRMMU_REF | SRMMU_DIRTY | SRMMU_ET_PTE)

/* Some day I will implement true fine grained access bits for

 * user pages because the SRMMU gives us the capabilities to

 * enforce all the protection levels that vma's can have.

 * XXX But for now...

 */

#define SRMMU_PAGE_NONE    __pgprot(SRMMU_VALID | SRMMU_CACHE | \

                                    SRMMU_PRIV | SRMMU_REF)

#define SRMMU_PAGE_SHARED  __pgprot(SRMMU_VALID | SRMMU_CACHE | \

                                    SRMMU_EXEC | SRMMU_WRITE | SRMMU_REF)

#define SRMMU_PAGE_COPY    __pgprot(SRMMU_VALID | SRMMU_CACHE | \

                                    SRMMU_EXEC | SRMMU_REF)

#define SRMMU_PAGE_RDONLY  __pgprot(SRMMU_VALID | SRMMU_CACHE | \

                                    SRMMU_EXEC | SRMMU_REF)

#define SRMMU_PAGE_KERNEL  __pgprot(SRMMU_VALID | SRMMU_CACHE | SRMMU_PRIV)

/* SRMMU Register addresses in ASI 0x4.  These are valid for all

 * current SRMMU implementations that exist.

 */

#define SRMMU_CTRL_REG           0x00000000

#define SRMMU_CTXTBL_PTR         0x00000100

#define SRMMU_CTX_REG            0x00000200

#define SRMMU_FAULT_STATUS       0x00000300

#define SRMMU_FAULT_ADDR         0x00000400

/* Accessing the MMU control register. */

extern inline unsigned int srmmu_get_mmureg(void)

{

        unsigned int retval;

        __asm__ __volatile__("lda [%%g0] %1, %0\n\t" :

                             "=r" (retval) :

                             "i" (ASI_M_MMUREGS));

        return retval;

}

extern inline void srmmu_set_mmureg(unsigned long regval)

{

        __asm__ __volatile__("sta %0, [%%g0] %1\n\t" : :

                             "r" (regval), "i" (ASI_M_MMUREGS) : "memory");

}

extern inline void srmmu_set_ctable_ptr(unsigned long paddr)

{

        paddr = ((paddr >> 4) & SRMMU_CTX_PMASK);

#if CONFIG_AP1000

        /* weird memory system on the AP1000 */

        paddr |= (0x8<<28);

#endif

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

                             "r" (paddr), "r" (SRMMU_CTXTBL_PTR),

                             "i" (ASI_M_MMUREGS) :

                             "memory");

}

extern inline unsigned long srmmu_get_ctable_ptr(void)

{

        unsigned int retval;

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

                             "=r" (retval) :

                             "r" (SRMMU_CTXTBL_PTR),

                             "i" (ASI_M_MMUREGS));

        return (retval & SRMMU_CTX_PMASK) << 4;

}

extern inline void srmmu_set_context(int context)

{

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

                             "r" (context), "r" (SRMMU_CTX_REG),

                             "i" (ASI_M_MMUREGS) : "memory");

}

extern inline int srmmu_get_context(void)

{

        register int retval;

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

                             "=r" (retval) :

                             "r" (SRMMU_CTX_REG),

                             "i" (ASI_M_MMUREGS));

        return retval;

}

extern inline unsigned int srmmu_get_fstatus(void)

{

        unsigned int retval;

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

                             "=r" (retval) :

                             "r" (SRMMU_FAULT_STATUS), "i" (ASI_M_MMUREGS));

        return retval;

}

extern inline unsigned int srmmu_get_faddr(void)

{

        unsigned int retval;

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

                             "=r" (retval) :

                             "r" (SRMMU_FAULT_ADDR), "i" (ASI_M_MMUREGS));

        return retval;

}

/* This is guaranteed on all SRMMU's. */

extern inline void srmmu_flush_whole_tlb(void)

{

        __asm__ __volatile__("sta %%g0, [%0] %1\n\t": :

                             "r" (0x400),        /* Flush entire TLB!! */

                             "i" (ASI_M_FLUSH_PROBE) : "memory");

}

/* These flush types are not available on all chips... */

extern inline void srmmu_flush_tlb_ctx(void)

{

        __asm__ __volatile__("sta %%g0, [%0] %1\n\t": :

                             "r" (0x300),        /* Flush TLB ctx.. */

                             "i" (ASI_M_FLUSH_PROBE) : "memory");

}

extern inline void srmmu_flush_tlb_region(unsigned long addr)

{

        addr &= SRMMU_PGDIR_MASK;

        __asm__ __volatile__("sta %%g0, [%0] %1\n\t": :

                             "r" (addr | 0x200), /* Flush TLB region.. */

                             "i" (ASI_M_FLUSH_PROBE) : "memory");

}

extern inline void srmmu_flush_tlb_segment(unsigned long addr)

{

        addr &= SRMMU_PMD_MASK;

        __asm__ __volatile__("sta %%g0, [%0] %1\n\t": :

                             "r" (addr | 0x100), /* Flush TLB segment.. */

                             "i" (ASI_M_FLUSH_PROBE) : "memory");

}

extern inline void srmmu_flush_tlb_page(unsigned long page)

{

        page &= PAGE_MASK;

        __asm__ __volatile__("sta %%g0, [%0] %1\n\t": :

                             "r" (page),        /* Flush TLB page.. */

                             "i" (ASI_M_FLUSH_PROBE) : "memory");

}

extern inline unsigned long srmmu_hwprobe(unsigned long vaddr)

{

        unsigned long retval;

        vaddr &= PAGE_MASK;

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

                             "=r" (retval) :

                             "r" (vaddr | 0x400), "i" (ASI_M_FLUSH_PROBE));

        return retval;

}

extern unsigned long (*srmmu_read_physical)(unsigned long paddr);

extern void (*srmmu_write_physical)(unsigned long paddr, unsigned long word);

#endif /* !(_SPARC_PGTSRMMU_H) */