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pgtable_64.h

/*
 * pgtable.h: SpitFire page table operations.
 *
 * Copyright 1996,1997 David S. Miller (davem@caip.rutgers.edu)
 * Copyright 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#ifndef _SPARC64_PGTABLE_H
#define _SPARC64_PGTABLE_H

/* This file contains the functions and defines necessary to modify and use
 * the SpitFire page tables.
 */

#include <asm-generic/pgtable-nopud.h>

#include <linux/compiler.h>
#include <linux/const.h>
#include <asm/types.h>
#include <asm/spitfire.h>
#include <asm/asi.h>
#include <asm/system.h>
#include <asm/page.h>
#include <asm/processor.h>

/* The kernel image occupies 0x4000000 to 0x6000000 (4MB --> 96MB).
 * The page copy blockops can use 0x6000000 to 0x8000000.
 * The TSB is mapped in the 0x8000000 to 0xa000000 range.
 * The PROM resides in an area spanning 0xf0000000 to 0x100000000.
 * The vmalloc area spans 0x100000000 to 0x200000000.
 * Since modules need to be in the lowest 32-bits of the address space,
 * we place them right before the OBP area from 0x10000000 to 0xf0000000.
 * There is a single static kernel PMD which maps from 0x0 to address
 * 0x400000000.
 */
#define     TLBTEMP_BASE            _AC(0x0000000006000000,UL)
#define     TSBMAP_BASE       _AC(0x0000000008000000,UL)
#define MODULES_VADDR         _AC(0x0000000010000000,UL)
#define MODULES_LEN           _AC(0x00000000e0000000,UL)
#define MODULES_END           _AC(0x00000000f0000000,UL)
#define LOW_OBP_ADDRESS       _AC(0x00000000f0000000,UL)
#define HI_OBP_ADDRESS        _AC(0x0000000100000000,UL)
#define VMALLOC_START         _AC(0x0000000100000000,UL)
#define VMALLOC_END           _AC(0x0000000200000000,UL)
#define VMEMMAP_BASE          _AC(0x0000000200000000,UL)

#define vmemmap               ((struct page *)VMEMMAP_BASE)

/* XXX All of this needs to be rethought so we can take advantage
 * XXX cheetah's full 64-bit virtual address space, ie. no more hole
 * XXX in the middle like on spitfire. -DaveM
 */
/*
 * Given a virtual address, the lowest PAGE_SHIFT bits determine offset
 * into the page; the next higher PAGE_SHIFT-3 bits determine the pte#
 * in the proper pagetable (the -3 is from the 8 byte ptes, and each page
 * table is a single page long). The next higher PMD_BITS determine pmd#
 * in the proper pmdtable (where we must have PMD_BITS <= (PAGE_SHIFT-2)
 * since the pmd entries are 4 bytes, and each pmd page is a single page
 * long). Finally, the higher few bits determine pgde#.
 */

/* PMD_SHIFT determines the size of the area a second-level page
 * table can map
 */
#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3))
#define PMD_SIZE  (_AC(1,UL) << PMD_SHIFT)
#define PMD_MASK  (~(PMD_SIZE-1))
#define PMD_BITS  (PAGE_SHIFT - 2)

/* PGDIR_SHIFT determines what a third-level page table entry can map */
#define PGDIR_SHIFT     (PAGE_SHIFT + (PAGE_SHIFT-3) + PMD_BITS)
#define PGDIR_SIZE      (_AC(1,UL) << PGDIR_SHIFT)
#define PGDIR_MASK      (~(PGDIR_SIZE-1))
#define PGDIR_BITS      (PAGE_SHIFT - 2)

#ifndef __ASSEMBLY__

#include <linux/sched.h>

/* Entries per page directory level. */
#define PTRS_PER_PTE    (1UL << (PAGE_SHIFT-3))
#define PTRS_PER_PMD    (1UL << PMD_BITS)
#define PTRS_PER_PGD    (1UL << PGDIR_BITS)

/* Kernel has a separate 44bit address space. */
#define FIRST_USER_ADDRESS    0

#define pte_ERROR(e)    __builtin_trap()
#define pmd_ERROR(e)    __builtin_trap()
#define pgd_ERROR(e)    __builtin_trap()

#endif /* !(__ASSEMBLY__) */

/* PTE bits which are the same in SUN4U and SUN4V format.  */
#define _PAGE_VALID       _AC(0x8000000000000000,UL) /* Valid TTE            */
#define _PAGE_R           _AC(0x8000000000000000,UL) /* Keep ref bit uptodate*/

/* SUN4U pte bits... */
#define _PAGE_SZ4MB_4U    _AC(0x6000000000000000,UL) /* 4MB Page             */
#define _PAGE_SZ512K_4U   _AC(0x4000000000000000,UL) /* 512K Page            */
#define _PAGE_SZ64K_4U    _AC(0x2000000000000000,UL) /* 64K Page             */
#define _PAGE_SZ8K_4U     _AC(0x0000000000000000,UL) /* 8K Page              */
#define _PAGE_NFO_4U      _AC(0x1000000000000000,UL) /* No Fault Only        */
#define _PAGE_IE_4U       _AC(0x0800000000000000,UL) /* Invert Endianness    */
#define _PAGE_SOFT2_4U    _AC(0x07FC000000000000,UL) /* Software bits, set 2 */
#define _PAGE_RES1_4U     _AC(0x0002000000000000,UL) /* Reserved             */
#define _PAGE_SZ32MB_4U   _AC(0x0001000000000000,UL) /* (Panther) 32MB page  */
#define _PAGE_SZ256MB_4U  _AC(0x2001000000000000,UL) /* (Panther) 256MB page */
#define _PAGE_SZALL_4U    _AC(0x6001000000000000,UL) /* All pgsz bits        */
#define _PAGE_SN_4U       _AC(0x0000800000000000,UL) /* (Cheetah) Snoop      */
#define _PAGE_RES2_4U     _AC(0x0000780000000000,UL) /* Reserved             */
#define _PAGE_PADDR_4U    _AC(0x000007FFFFFFE000,UL) /* (Cheetah) pa[42:13]  */
#define _PAGE_SOFT_4U     _AC(0x0000000000001F80,UL) /* Software bits:       */
#define _PAGE_EXEC_4U     _AC(0x0000000000001000,UL) /* Executable SW bit    */
#define _PAGE_MODIFIED_4U _AC(0x0000000000000800,UL) /* Modified (dirty)     */
#define _PAGE_FILE_4U     _AC(0x0000000000000800,UL) /* Pagecache page       */
#define _PAGE_ACCESSED_4U _AC(0x0000000000000400,UL) /* Accessed (ref'd)     */
#define _PAGE_READ_4U     _AC(0x0000000000000200,UL) /* Readable SW Bit      */
#define _PAGE_WRITE_4U    _AC(0x0000000000000100,UL) /* Writable SW Bit      */
#define _PAGE_PRESENT_4U  _AC(0x0000000000000080,UL) /* Present              */
#define _PAGE_L_4U        _AC(0x0000000000000040,UL) /* Locked TTE           */
#define _PAGE_CP_4U       _AC(0x0000000000000020,UL) /* Cacheable in P-Cache */
#define _PAGE_CV_4U       _AC(0x0000000000000010,UL) /* Cacheable in V-Cache */
#define _PAGE_E_4U        _AC(0x0000000000000008,UL) /* side-Effect          */
#define _PAGE_P_4U        _AC(0x0000000000000004,UL) /* Privileged Page      */
#define _PAGE_W_4U        _AC(0x0000000000000002,UL) /* Writable             */

/* SUN4V pte bits... */
#define _PAGE_NFO_4V      _AC(0x4000000000000000,UL) /* No Fault Only        */
#define _PAGE_SOFT2_4V    _AC(0x3F00000000000000,UL) /* Software bits, set 2 */
#define _PAGE_MODIFIED_4V _AC(0x2000000000000000,UL) /* Modified (dirty)     */
#define _PAGE_ACCESSED_4V _AC(0x1000000000000000,UL) /* Accessed (ref'd)     */
#define _PAGE_READ_4V     _AC(0x0800000000000000,UL) /* Readable SW Bit      */
#define _PAGE_WRITE_4V    _AC(0x0400000000000000,UL) /* Writable SW Bit      */
#define _PAGE_PADDR_4V    _AC(0x00FFFFFFFFFFE000,UL) /* paddr[55:13]         */
#define _PAGE_IE_4V       _AC(0x0000000000001000,UL) /* Invert Endianness    */
#define _PAGE_E_4V        _AC(0x0000000000000800,UL) /* side-Effect          */
#define _PAGE_CP_4V       _AC(0x0000000000000400,UL) /* Cacheable in P-Cache */
#define _PAGE_CV_4V       _AC(0x0000000000000200,UL) /* Cacheable in V-Cache */
#define _PAGE_P_4V        _AC(0x0000000000000100,UL) /* Privileged Page      */
#define _PAGE_EXEC_4V     _AC(0x0000000000000080,UL) /* Executable Page      */
#define _PAGE_W_4V        _AC(0x0000000000000040,UL) /* Writable             */
#define _PAGE_SOFT_4V     _AC(0x0000000000000030,UL) /* Software bits        */
#define _PAGE_FILE_4V     _AC(0x0000000000000020,UL) /* Pagecache page       */
#define _PAGE_PRESENT_4V  _AC(0x0000000000000010,UL) /* Present              */
#define _PAGE_RESV_4V     _AC(0x0000000000000008,UL) /* Reserved             */
#define _PAGE_SZ16GB_4V   _AC(0x0000000000000007,UL) /* 16GB Page            */
#define _PAGE_SZ2GB_4V    _AC(0x0000000000000006,UL) /* 2GB Page             */
#define _PAGE_SZ256MB_4V  _AC(0x0000000000000005,UL) /* 256MB Page           */
#define _PAGE_SZ32MB_4V   _AC(0x0000000000000004,UL) /* 32MB Page            */
#define _PAGE_SZ4MB_4V    _AC(0x0000000000000003,UL) /* 4MB Page             */
#define _PAGE_SZ512K_4V   _AC(0x0000000000000002,UL) /* 512K Page            */
#define _PAGE_SZ64K_4V    _AC(0x0000000000000001,UL) /* 64K Page             */
#define _PAGE_SZ8K_4V     _AC(0x0000000000000000,UL) /* 8K Page              */
#define _PAGE_SZALL_4V    _AC(0x0000000000000007,UL) /* All pgsz bits        */

#if PAGE_SHIFT == 13
#define _PAGE_SZBITS_4U _PAGE_SZ8K_4U
#define _PAGE_SZBITS_4V _PAGE_SZ8K_4V
#elif PAGE_SHIFT == 16
#define _PAGE_SZBITS_4U _PAGE_SZ64K_4U
#define _PAGE_SZBITS_4V _PAGE_SZ64K_4V
#else
#error Wrong PAGE_SHIFT specified
#endif

#if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
#define _PAGE_SZHUGE_4U _PAGE_SZ4MB_4U
#define _PAGE_SZHUGE_4V _PAGE_SZ4MB_4V
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
#define _PAGE_SZHUGE_4U _PAGE_SZ512K_4U
#define _PAGE_SZHUGE_4V _PAGE_SZ512K_4V
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
#define _PAGE_SZHUGE_4U _PAGE_SZ64K_4U
#define _PAGE_SZHUGE_4V _PAGE_SZ64K_4V
#endif

/* These are actually filled in at boot time by sun4{u,v}_pgprot_init() */
#define __P000    __pgprot(0)
#define __P001    __pgprot(0)
#define __P010    __pgprot(0)
#define __P011    __pgprot(0)
#define __P100    __pgprot(0)
#define __P101    __pgprot(0)
#define __P110    __pgprot(0)
#define __P111    __pgprot(0)

#define __S000    __pgprot(0)
#define __S001    __pgprot(0)
#define __S010    __pgprot(0)
#define __S011    __pgprot(0)
#define __S100    __pgprot(0)
#define __S101    __pgprot(0)
#define __S110    __pgprot(0)
#define __S111    __pgprot(0)

#ifndef __ASSEMBLY__

extern pte_t mk_pte_io(unsigned long, pgprot_t, int, unsigned long);

extern unsigned long pte_sz_bits(unsigned long size);

extern pgprot_t PAGE_KERNEL;
extern pgprot_t PAGE_KERNEL_LOCKED;
extern pgprot_t PAGE_COPY;
extern pgprot_t PAGE_SHARED;

/* XXX This uglyness is for the atyfb driver's sparc mmap() support. XXX */
extern unsigned long _PAGE_IE;
extern unsigned long _PAGE_E;
extern unsigned long _PAGE_CACHE;

extern unsigned long pg_iobits;
extern unsigned long _PAGE_ALL_SZ_BITS;
extern unsigned long _PAGE_SZBITS;

extern struct page *mem_map_zero;
#define ZERO_PAGE(vaddr)      (mem_map_zero)

/* PFNs are real physical page numbers.  However, mem_map only begins to record
 * per-page information starting at pfn_base.  This is to handle systems where
 * the first physical page in the machine is at some huge physical address,
 * such as 4GB.   This is common on a partitioned E10000, for example.
 */
static inline pte_t pfn_pte(unsigned long pfn, pgprot_t prot)
{
      unsigned long paddr = pfn << PAGE_SHIFT;
      unsigned long sz_bits;

      sz_bits = 0UL;
      if (_PAGE_SZBITS_4U != 0UL || _PAGE_SZBITS_4V != 0UL) {
            __asm__ __volatile__(
            "\n661:     sethi       %%uhi(%1), %0\n"
            "     sllx        %0, 32, %0\n"
            "     .section    .sun4v_2insn_patch, \"ax\"\n"
            "     .word       661b\n"
            "     mov         %2, %0\n"
            "     nop\n"
            "     .previous\n"
            : "=r" (sz_bits)
            : "i" (_PAGE_SZBITS_4U), "i" (_PAGE_SZBITS_4V));
      }
      return __pte(paddr | sz_bits | pgprot_val(prot));
}
#define mk_pte(page, pgprot)  pfn_pte(page_to_pfn(page), (pgprot))

/* This one can be done with two shifts.  */
static inline unsigned long pte_pfn(pte_t pte)
{
      unsigned long ret;

      __asm__ __volatile__(
      "\n661:     sllx        %1, %2, %0\n"
      "     srlx        %0, %3, %0\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sllx        %1, %4, %0\n"
      "     srlx        %0, %5, %0\n"
      "     .previous\n"
      : "=r" (ret)
      : "r" (pte_val(pte)),
        "i" (21), "i" (21 + PAGE_SHIFT),
        "i" (8), "i" (8 + PAGE_SHIFT));

      return ret;
}
#define pte_page(x) pfn_to_page(pte_pfn(x))

static inline pte_t pte_modify(pte_t pte, pgprot_t prot)
{
      unsigned long mask, tmp;

      /* SUN4U: 0x600307ffffffecb8 (negated == 0x9ffcf80000001347)
       * SUN4V: 0x30ffffffffffee17 (negated == 0xcf000000000011e8)
       *
       * Even if we use negation tricks the result is still a 6
       * instruction sequence, so don't try to play fancy and just
       * do the most straightforward implementation.
       *
       * Note: We encode this into 3 sun4v 2-insn patch sequences.
       */

      __asm__ __volatile__(
      "\n661:     sethi       %%uhi(%2), %1\n"
      "     sethi       %%hi(%2), %0\n"
      "\n662:     or          %1, %%ulo(%2), %1\n"
      "     or          %0, %%lo(%2), %0\n"
      "\n663:     sllx        %1, 32, %1\n"
      "     or          %0, %1, %0\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sethi       %%uhi(%3), %1\n"
      "     sethi       %%hi(%3), %0\n"
      "     .word       662b\n"
      "     or          %1, %%ulo(%3), %1\n"
      "     or          %0, %%lo(%3), %0\n"
      "     .word       663b\n"
      "     sllx        %1, 32, %1\n"
      "     or          %0, %1, %0\n"
      "     .previous\n"
      : "=r" (mask), "=r" (tmp)
      : "i" (_PAGE_PADDR_4U | _PAGE_MODIFIED_4U | _PAGE_ACCESSED_4U |
             _PAGE_CP_4U | _PAGE_CV_4U | _PAGE_E_4U | _PAGE_PRESENT_4U |
             _PAGE_SZBITS_4U),
        "i" (_PAGE_PADDR_4V | _PAGE_MODIFIED_4V | _PAGE_ACCESSED_4V |
             _PAGE_CP_4V | _PAGE_CV_4V | _PAGE_E_4V | _PAGE_PRESENT_4V |
             _PAGE_SZBITS_4V));

      return __pte((pte_val(pte) & mask) | (pgprot_val(prot) & ~mask));
}

static inline pte_t pgoff_to_pte(unsigned long off)
{
      off <<= PAGE_SHIFT;

      __asm__ __volatile__(
      "\n661:     or          %0, %2, %0\n"
      "     .section    .sun4v_1insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     or          %0, %3, %0\n"
      "     .previous\n"
      : "=r" (off)
      : "0" (off), "i" (_PAGE_FILE_4U), "i" (_PAGE_FILE_4V));

      return __pte(off);
}

static inline pgprot_t pgprot_noncached(pgprot_t prot)
{
      unsigned long val = pgprot_val(prot);

      __asm__ __volatile__(
      "\n661:     andn        %0, %2, %0\n"
      "     or          %0, %3, %0\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     andn        %0, %4, %0\n"
      "     or          %0, %5, %0\n"
      "     .previous\n"
      : "=r" (val)
      : "0" (val), "i" (_PAGE_CP_4U | _PAGE_CV_4U), "i" (_PAGE_E_4U),
                   "i" (_PAGE_CP_4V | _PAGE_CV_4V), "i" (_PAGE_E_4V));

      return __pgprot(val);
}
/* Various pieces of code check for platform support by ifdef testing
 * on "pgprot_noncached".  That's broken and should be fixed, but for
 * now...
 */
#define pgprot_noncached pgprot_noncached

#ifdef CONFIG_HUGETLB_PAGE
static inline pte_t pte_mkhuge(pte_t pte)
{
      unsigned long mask;

      __asm__ __volatile__(
      "\n661:     sethi       %%uhi(%1), %0\n"
      "     sllx        %0, 32, %0\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     mov         %2, %0\n"
      "     nop\n"
      "     .previous\n"
      : "=r" (mask)
      : "i" (_PAGE_SZHUGE_4U), "i" (_PAGE_SZHUGE_4V));

      return __pte(pte_val(pte) | mask);
}
#endif

static inline pte_t pte_mkdirty(pte_t pte)
{
      unsigned long val = pte_val(pte), tmp;

      __asm__ __volatile__(
      "\n661:     or          %0, %3, %0\n"
      "     nop\n"
      "\n662:     nop\n"
      "     nop\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sethi       %%uhi(%4), %1\n"
      "     sllx        %1, 32, %1\n"
      "     .word       662b\n"
      "     or          %1, %%lo(%4), %1\n"
      "     or          %0, %1, %0\n"
      "     .previous\n"
      : "=r" (val), "=r" (tmp)
      : "0" (val), "i" (_PAGE_MODIFIED_4U | _PAGE_W_4U),
        "i" (_PAGE_MODIFIED_4V | _PAGE_W_4V));

      return __pte(val);
}

static inline pte_t pte_mkclean(pte_t pte)
{
      unsigned long val = pte_val(pte), tmp;

      __asm__ __volatile__(
      "\n661:     andn        %0, %3, %0\n"
      "     nop\n"
      "\n662:     nop\n"
      "     nop\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sethi       %%uhi(%4), %1\n"
      "     sllx        %1, 32, %1\n"
      "     .word       662b\n"
      "     or          %1, %%lo(%4), %1\n"
      "     andn        %0, %1, %0\n"
      "     .previous\n"
      : "=r" (val), "=r" (tmp)
      : "0" (val), "i" (_PAGE_MODIFIED_4U | _PAGE_W_4U),
        "i" (_PAGE_MODIFIED_4V | _PAGE_W_4V));

      return __pte(val);
}

static inline pte_t pte_mkwrite(pte_t pte)
{
      unsigned long val = pte_val(pte), mask;

      __asm__ __volatile__(
      "\n661:     mov         %1, %0\n"
      "     nop\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sethi       %%uhi(%2), %0\n"
      "     sllx        %0, 32, %0\n"
      "     .previous\n"
      : "=r" (mask)
      : "i" (_PAGE_WRITE_4U), "i" (_PAGE_WRITE_4V));

      return __pte(val | mask);
}

static inline pte_t pte_wrprotect(pte_t pte)
{
      unsigned long val = pte_val(pte), tmp;

      __asm__ __volatile__(
      "\n661:     andn        %0, %3, %0\n"
      "     nop\n"
      "\n662:     nop\n"
      "     nop\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sethi       %%uhi(%4), %1\n"
      "     sllx        %1, 32, %1\n"
      "     .word       662b\n"
      "     or          %1, %%lo(%4), %1\n"
      "     andn        %0, %1, %0\n"
      "     .previous\n"
      : "=r" (val), "=r" (tmp)
      : "0" (val), "i" (_PAGE_WRITE_4U | _PAGE_W_4U),
        "i" (_PAGE_WRITE_4V | _PAGE_W_4V));

      return __pte(val);
}

static inline pte_t pte_mkold(pte_t pte)
{
      unsigned long mask;

      __asm__ __volatile__(
      "\n661:     mov         %1, %0\n"
      "     nop\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sethi       %%uhi(%2), %0\n"
      "     sllx        %0, 32, %0\n"
      "     .previous\n"
      : "=r" (mask)
      : "i" (_PAGE_ACCESSED_4U), "i" (_PAGE_ACCESSED_4V));

      mask |= _PAGE_R;

      return __pte(pte_val(pte) & ~mask);
}

static inline pte_t pte_mkyoung(pte_t pte)
{
      unsigned long mask;

      __asm__ __volatile__(
      "\n661:     mov         %1, %0\n"
      "     nop\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sethi       %%uhi(%2), %0\n"
      "     sllx        %0, 32, %0\n"
      "     .previous\n"
      : "=r" (mask)
      : "i" (_PAGE_ACCESSED_4U), "i" (_PAGE_ACCESSED_4V));

      mask |= _PAGE_R;

      return __pte(pte_val(pte) | mask);
}

static inline pte_t pte_mkspecial(pte_t pte)
{
      return pte;
}

static inline unsigned long pte_young(pte_t pte)
{
      unsigned long mask;

      __asm__ __volatile__(
      "\n661:     mov         %1, %0\n"
      "     nop\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sethi       %%uhi(%2), %0\n"
      "     sllx        %0, 32, %0\n"
      "     .previous\n"
      : "=r" (mask)
      : "i" (_PAGE_ACCESSED_4U), "i" (_PAGE_ACCESSED_4V));

      return (pte_val(pte) & mask);
}

static inline unsigned long pte_dirty(pte_t pte)
{
      unsigned long mask;

      __asm__ __volatile__(
      "\n661:     mov         %1, %0\n"
      "     nop\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sethi       %%uhi(%2), %0\n"
      "     sllx        %0, 32, %0\n"
      "     .previous\n"
      : "=r" (mask)
      : "i" (_PAGE_MODIFIED_4U), "i" (_PAGE_MODIFIED_4V));

      return (pte_val(pte) & mask);
}

static inline unsigned long pte_write(pte_t pte)
{
      unsigned long mask;

      __asm__ __volatile__(
      "\n661:     mov         %1, %0\n"
      "     nop\n"
      "     .section    .sun4v_2insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     sethi       %%uhi(%2), %0\n"
      "     sllx        %0, 32, %0\n"
      "     .previous\n"
      : "=r" (mask)
      : "i" (_PAGE_WRITE_4U), "i" (_PAGE_WRITE_4V));

      return (pte_val(pte) & mask);
}

static inline unsigned long pte_exec(pte_t pte)
{
      unsigned long mask;

      __asm__ __volatile__(
      "\n661:     sethi       %%hi(%1), %0\n"
      "     .section    .sun4v_1insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     mov         %2, %0\n"
      "     .previous\n"
      : "=r" (mask)
      : "i" (_PAGE_EXEC_4U), "i" (_PAGE_EXEC_4V));

      return (pte_val(pte) & mask);
}

static inline unsigned long pte_file(pte_t pte)
{
      unsigned long val = pte_val(pte);

      __asm__ __volatile__(
      "\n661:     and         %0, %2, %0\n"
      "     .section    .sun4v_1insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     and         %0, %3, %0\n"
      "     .previous\n"
      : "=r" (val)
      : "0" (val), "i" (_PAGE_FILE_4U), "i" (_PAGE_FILE_4V));

      return val;
}

static inline unsigned long pte_present(pte_t pte)
{
      unsigned long val = pte_val(pte);

      __asm__ __volatile__(
      "\n661:     and         %0, %2, %0\n"
      "     .section    .sun4v_1insn_patch, \"ax\"\n"
      "     .word       661b\n"
      "     and         %0, %3, %0\n"
      "     .previous\n"
      : "=r" (val)
      : "0" (val), "i" (_PAGE_PRESENT_4U), "i" (_PAGE_PRESENT_4V));

      return val;
}

static inline int pte_special(pte_t pte)
{
      return 0;
}

#define pmd_set(pmdp, ptep)   \
      (pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> 11UL))
#define pud_set(pudp, pmdp)   \
      (pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> 11UL))
#define __pmd_page(pmd)       \
      ((unsigned long) __va((((unsigned long)pmd_val(pmd))<<11UL)))
#define pmd_page(pmd)               virt_to_page((void *)__pmd_page(pmd))
#define pud_page_vaddr(pud)         \
      ((unsigned long) __va((((unsigned long)pud_val(pud))<<11UL)))
#define pud_page(pud)               virt_to_page((void *)pud_page_vaddr(pud))
#define pmd_none(pmd)               (!pmd_val(pmd))
#define pmd_bad(pmd)                (0)
#define pmd_present(pmd)            (pmd_val(pmd) != 0U)
#define pmd_clear(pmdp)             (pmd_val(*(pmdp)) = 0U)
#define pud_none(pud)               (!pud_val(pud))
#define pud_bad(pud)                (0)
#define pud_present(pud)            (pud_val(pud) != 0U)
#define pud_clear(pudp)             (pud_val(*(pudp)) = 0U)

/* Same in both SUN4V and SUN4U.  */
#define pte_none(pte)               (!pte_val(pte))

/* to find an entry in a page-table-directory. */
#define pgd_index(address)    (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
#define pgd_offset(mm, address)     ((mm)->pgd + pgd_index(address))

/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)

/* Find an entry in the second-level page table.. */
#define pmd_offset(pudp, address)   \
      ((pmd_t *) pud_page_vaddr(*(pudp)) + \
       (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)))

/* Find an entry in the third-level page table.. */
#define pte_index(dir, address)     \
      ((pte_t *) __pmd_page(*(dir)) + \
       ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
#define pte_offset_kernel           pte_index
#define pte_offset_map              pte_index
#define pte_offset_map_nested       pte_index
#define pte_unmap(pte)              do { } while (0)
#define pte_unmap_nested(pte)       do { } while (0)

/* Actual page table PTE updates.  */
extern void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig);

static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
{
      pte_t orig = *ptep;

      *ptep = pte;

      /* It is more efficient to let flush_tlb_kernel_range()
       * handle init_mm tlb flushes.
       *
       * SUN4V NOTE: _PAGE_VALID is the same value in both the SUN4U
       *             and SUN4V pte layout, so this inline test is fine.
       */
      if (likely(mm != &init_mm) && (pte_val(orig) & _PAGE_VALID))
            tlb_batch_add(mm, addr, ptep, orig);
}

#define pte_clear(mm,addr,ptep)           \
      set_pte_at((mm), (addr), (ptep), __pte(0UL))

#ifdef DCACHE_ALIASING_POSSIBLE
#define __HAVE_ARCH_MOVE_PTE
#define move_pte(pte, prot, old_addr, new_addr)                   \
({                                                    \
      pte_t newpte = (pte);                                 \
      if (tlb_type != hypervisor && pte_present(pte)) {           \
            unsigned long this_pfn = pte_pfn(pte);                \
                                                      \
            if (pfn_valid(this_pfn) &&                      \
                (((old_addr) ^ (new_addr)) & (1 << 13)))          \
                  flush_dcache_page_all(current->mm,        \
                                    pfn_to_page(this_pfn)); \
      }                                               \
      newpte;                                               \
})
#endif

extern pgd_t swapper_pg_dir[2048];
extern pmd_t swapper_low_pmd_dir[2048];

extern void paging_init(void);
extern unsigned long find_ecache_flush_span(unsigned long size);

/* These do nothing with the way I have things setup. */
#define mmu_lockarea(vaddr, len)          (vaddr)
#define mmu_unlockarea(vaddr, len)        do { } while(0)

struct vm_area_struct;
extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);

/* Encode and de-code a swap entry */
#define __swp_type(entry)     (((entry).val >> PAGE_SHIFT) & 0xffUL)
#define __swp_offset(entry)   ((entry).val >> (PAGE_SHIFT + 8UL))
#define __swp_entry(type, offset)   \
      ( (swp_entry_t) \
        { \
            (((long)(type) << PAGE_SHIFT) | \
                 ((long)(offset) << (PAGE_SHIFT + 8UL))) \
        } )
#define __pte_to_swp_entry(pte)           ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)       ((pte_t) { (x).val })

/* File offset in PTE support. */
extern unsigned long pte_file(pte_t);
#define pte_to_pgoff(pte)     (pte_val(pte) >> PAGE_SHIFT)
extern pte_t pgoff_to_pte(unsigned long);
#define PTE_FILE_MAX_BITS     (64UL - PAGE_SHIFT - 1UL)

extern unsigned long *sparc64_valid_addr_bitmap;

/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
#define kern_addr_valid(addr) \
      (test_bit(__pa((unsigned long)(addr))>>22, sparc64_valid_addr_bitmap))

extern int page_in_phys_avail(unsigned long paddr);

extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
                         unsigned long pfn,
                         unsigned long size, pgprot_t prot);

/*
 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 * its high 4 bits.  These macros/functions put it there or get it from there.
 */
#define MK_IOSPACE_PFN(space, pfn)  (pfn | (space << (BITS_PER_LONG - 4)))
#define GET_IOSPACE(pfn)            (pfn >> (BITS_PER_LONG - 4))
#define GET_PFN(pfn)                (pfn & 0x0fffffffffffffffUL)

#include <asm-generic/pgtable.h>

/* We provide our own get_unmapped_area to cope with VA holes and
 * SHM area cache aliasing for userland.
 */
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN

/* We provide a special get_unmapped_area for framebuffer mmaps to try and use
 * the largest alignment possible such that larget PTEs can be used.
 */
extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
                                unsigned long, unsigned long,
                                unsigned long);
#define HAVE_ARCH_FB_UNMAPPED_AREA

extern void pgtable_cache_init(void);
extern void sun4v_register_fault_status(void);
extern void sun4v_ktsb_register(void);
extern void __init cheetah_ecache_flush_init(void);
extern void sun4v_patch_tlb_handlers(void);

extern unsigned long cmdline_memory_size;

#endif /* !(__ASSEMBLY__) */

#endif /* !(_SPARC64_PGTABLE_H) */

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