Linux-2.6.12-rc2v2.6.12-rc2

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!

1 files changed, 464 insertions, 0 deletions

diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h
new file mode 100644
index 000000000000..ca04ac105b69
--- /dev/null
+++ b/include/asm-sparc64/pgtable.h
@@ -0,0 +1,464 @@
+/* $Id: pgtable.h,v 1.156 2002/02/09 19:49:31 davem Exp $
+ * 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/config.h>
+#include <linux/compiler.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>
+#include <asm/const.h>
+
+/* The kernel image occupies 0x4000000 to 0x1000000 (4MB --> 16MB).
+ * The page copy blockops use 0x1000000 to 0x18000000 (16MB --> 24MB).
+ * The PROM resides in an area spanning 0xf0000000 to 0x100000000.
+ * The vmalloc area spans 0x140000000 to 0x200000000.
+ * There is a single static kernel PMD which maps from 0x0 to address
+ * 0x400000000.
+ */
+#define	TLBTEMP_BASE		_AC(0x0000000001000000,UL)
+#define MODULES_VADDR		_AC(0x0000000002000000,UL)
+#define MODULES_LEN		_AC(0x000000007e000000,UL)
+#define MODULES_END		_AC(0x0000000080000000,UL)
+#define VMALLOC_START		_AC(0x0000000140000000,UL)
+#define VMALLOC_END		_AC(0x0000000200000000,UL)
+#define LOW_OBP_ADDRESS		_AC(0x00000000f0000000,UL)
+#define HI_OBP_ADDRESS		_AC(0x0000000100000000,UL)
+
+/* 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	(1UL << 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	(1UL << 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_PGD_NR	0
+
+#define pte_ERROR(e)	__builtin_trap()
+#define pmd_ERROR(e)	__builtin_trap()
+#define pgd_ERROR(e)	__builtin_trap()
+
+#endif /* !(__ASSEMBLY__) */
+
+/* Spitfire/Cheetah TTE bits. */
+#define _PAGE_VALID	_AC(0x8000000000000000,UL) /* Valid TTE              */
+#define _PAGE_R		_AC(0x8000000000000000,UL) /* Keep ref bit up to date*/
+#define _PAGE_SZ4MB	_AC(0x6000000000000000,UL) /* 4MB Page               */
+#define _PAGE_SZ512K	_AC(0x4000000000000000,UL) /* 512K Page              */
+#define _PAGE_SZ64K	_AC(0x2000000000000000,UL) /* 64K Page               */
+#define _PAGE_SZ8K	_AC(0x0000000000000000,UL) /* 8K Page                */
+#define _PAGE_NFO	_AC(0x1000000000000000,UL) /* No Fault Only          */
+#define _PAGE_IE	_AC(0x0800000000000000,UL) /* Invert Endianness      */
+#define _PAGE_SOFT2	_AC(0x07FC000000000000,UL) /* Software bits, set 2   */
+#define _PAGE_RES1	_AC(0x0003000000000000,UL) /* Reserved               */
+#define _PAGE_SN	_AC(0x0000800000000000,UL) /* (Cheetah) Snoop        */
+#define _PAGE_RES2	_AC(0x0000780000000000,UL) /* Reserved               */
+#define _PAGE_PADDR_SF	_AC(0x000001FFFFFFE000,UL) /* (Spitfire) paddr[40:13]*/
+#define _PAGE_PADDR	_AC(0x000007FFFFFFE000,UL) /* (Cheetah) paddr[42:13] */
+#define _PAGE_SOFT	_AC(0x0000000000001F80,UL) /* Software bits          */
+#define _PAGE_L		_AC(0x0000000000000040,UL) /* Locked TTE             */
+#define _PAGE_CP	_AC(0x0000000000000020,UL) /* Cacheable in P-Cache   */
+#define _PAGE_CV	_AC(0x0000000000000010,UL) /* Cacheable in V-Cache   */
+#define _PAGE_E		_AC(0x0000000000000008,UL) /* side-Effect            */
+#define _PAGE_P		_AC(0x0000000000000004,UL) /* Privileged Page        */
+#define _PAGE_W		_AC(0x0000000000000002,UL) /* Writable               */
+#define _PAGE_G		_AC(0x0000000000000001,UL) /* Global                 */
+
+/* Here are the SpitFire software bits we use in the TTE's.
+ *
+ * WARNING: If you are going to try and start using some
+ *          of the soft2 bits, you will need to make
+ *          modifications to the swap entry implementation.
+ *	    For example, one thing that could happen is that
+ *          swp_entry_to_pte() would BUG_ON() if you tried
+ *          to use one of the soft2 bits for _PAGE_FILE.
+ *
+ * Like other architectures, I have aliased _PAGE_FILE with
+ * _PAGE_MODIFIED.  This works because _PAGE_FILE is never
+ * interpreted that way unless _PAGE_PRESENT is clear.
+ */
+#define _PAGE_EXEC	_AC(0x0000000000001000,UL)	/* Executable SW bit */
+#define _PAGE_MODIFIED	_AC(0x0000000000000800,UL)	/* Modified (dirty)  */
+#define _PAGE_FILE	_AC(0x0000000000000800,UL)	/* Pagecache page    */
+#define _PAGE_ACCESSED	_AC(0x0000000000000400,UL)	/* Accessed (ref'd)  */
+#define _PAGE_READ	_AC(0x0000000000000200,UL)	/* Readable SW Bit   */
+#define _PAGE_WRITE	_AC(0x0000000000000100,UL)	/* Writable SW Bit   */
+#define _PAGE_PRESENT	_AC(0x0000000000000080,UL)	/* Present           */
+
+#if PAGE_SHIFT == 13
+#define _PAGE_SZBITS	_PAGE_SZ8K
+#elif PAGE_SHIFT == 16
+#define _PAGE_SZBITS	_PAGE_SZ64K
+#elif PAGE_SHIFT == 19
+#define _PAGE_SZBITS	_PAGE_SZ512K
+#elif PAGE_SHIFT == 22
+#define _PAGE_SZBITS	_PAGE_SZ4MB
+#else
+#error Wrong PAGE_SHIFT specified
+#endif
+
+#if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
+#define _PAGE_SZHUGE	_PAGE_SZ4MB
+#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
+#define _PAGE_SZHUGE	_PAGE_SZ512K
+#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
+#define _PAGE_SZHUGE	_PAGE_SZ64K
+#endif
+
+#define _PAGE_CACHE	(_PAGE_CP | _PAGE_CV)
+
+#define __DIRTY_BITS	(_PAGE_MODIFIED | _PAGE_WRITE | _PAGE_W)
+#define __ACCESS_BITS	(_PAGE_ACCESSED | _PAGE_READ | _PAGE_R)
+#define __PRIV_BITS	_PAGE_P
+
+#define PAGE_NONE	__pgprot (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_CACHE)
+
+/* Don't set the TTE _PAGE_W bit here, else the dirty bit never gets set. */
+#define PAGE_SHARED	__pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \
+				  __ACCESS_BITS | _PAGE_WRITE | _PAGE_EXEC)
+
+#define PAGE_COPY	__pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \
+				  __ACCESS_BITS | _PAGE_EXEC)
+
+#define PAGE_READONLY	__pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \
+				  __ACCESS_BITS | _PAGE_EXEC)
+
+#define PAGE_KERNEL	__pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \
+				  __PRIV_BITS | \
+				  __ACCESS_BITS | __DIRTY_BITS | _PAGE_EXEC)
+
+#define PAGE_SHARED_NOEXEC	__pgprot (_PAGE_PRESENT | _PAGE_VALID | \
+					  _PAGE_CACHE | \
+					  __ACCESS_BITS | _PAGE_WRITE)
+
+#define PAGE_COPY_NOEXEC	__pgprot (_PAGE_PRESENT | _PAGE_VALID | \
+					  _PAGE_CACHE | __ACCESS_BITS)
+
+#define PAGE_READONLY_NOEXEC	__pgprot (_PAGE_PRESENT | _PAGE_VALID | \
+					  _PAGE_CACHE | __ACCESS_BITS)
+
+#define _PFN_MASK	_PAGE_PADDR
+
+#define pg_iobits (_PAGE_VALID | _PAGE_PRESENT | __DIRTY_BITS | \
+		   __ACCESS_BITS | _PAGE_E)
+
+#define __P000	PAGE_NONE
+#define __P001	PAGE_READONLY_NOEXEC
+#define __P010	PAGE_COPY_NOEXEC
+#define __P011	PAGE_COPY_NOEXEC
+#define __P100	PAGE_READONLY
+#define __P101	PAGE_READONLY
+#define __P110	PAGE_COPY
+#define __P111	PAGE_COPY
+
+#define __S000	PAGE_NONE
+#define __S001	PAGE_READONLY_NOEXEC
+#define __S010	PAGE_SHARED_NOEXEC
+#define __S011	PAGE_SHARED_NOEXEC
+#define __S100	PAGE_READONLY
+#define __S101	PAGE_READONLY
+#define __S110	PAGE_SHARED
+#define __S111	PAGE_SHARED
+
+#ifndef __ASSEMBLY__
+
+extern unsigned long phys_base;
+extern unsigned long pfn_base;
+
+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.
+ */
+
+#define pfn_pte(pfn, prot)	\
+	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot) | _PAGE_SZBITS)
+#define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))
+
+#define pte_pfn(x)		((pte_val(x) & _PAGE_PADDR)>>PAGE_SHIFT)
+#define pte_page(x)		pfn_to_page(pte_pfn(x))
+
+#define page_pte_prot(page, prot)	mk_pte(page, prot)
+#define page_pte(page)			page_pte_prot(page, __pgprot(0))
+
+static inline pte_t pte_modify(pte_t orig_pte, pgprot_t new_prot)
+{
+	pte_t __pte;
+	const unsigned long preserve_mask = (_PFN_MASK |
+					     _PAGE_MODIFIED | _PAGE_ACCESSED |
+					     _PAGE_CACHE | _PAGE_E |
+					     _PAGE_PRESENT | _PAGE_SZBITS);
+
+	pte_val(__pte) = (pte_val(orig_pte) & preserve_mask) |
+		(pgprot_val(new_prot) & ~preserve_mask);
+
+	return __pte;
+}
+#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(pud)		\
+	((unsigned long) __va((((unsigned long)pud_val(pud))<<11UL)))
+#define pte_none(pte) 			(!pte_val(pte))
+#define pte_present(pte)		(pte_val(pte) & _PAGE_PRESENT)
+#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)
+
+/* The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+#define pte_read(pte)		(pte_val(pte) & _PAGE_READ)
+#define pte_exec(pte)		(pte_val(pte) & _PAGE_EXEC)
+#define pte_write(pte)		(pte_val(pte) & _PAGE_WRITE)
+#define pte_dirty(pte)		(pte_val(pte) & _PAGE_MODIFIED)
+#define pte_young(pte)		(pte_val(pte) & _PAGE_ACCESSED)
+#define pte_wrprotect(pte)	(__pte(pte_val(pte) & ~(_PAGE_WRITE|_PAGE_W)))
+#define pte_rdprotect(pte)	\
+	(__pte(((pte_val(pte)<<1UL)>>1UL) & ~_PAGE_READ))
+#define pte_mkclean(pte)	\
+	(__pte(pte_val(pte) & ~(_PAGE_MODIFIED|_PAGE_W)))
+#define pte_mkold(pte)		\
+	(__pte(((pte_val(pte)<<1UL)>>1UL) & ~_PAGE_ACCESSED))
+
+/* Permanent address of a page. */
+#define __page_address(page)	page_address(page)
+
+/* Be very careful when you change these three, they are delicate. */
+#define pte_mkyoung(pte)	(__pte(pte_val(pte) | _PAGE_ACCESSED | _PAGE_R))
+#define pte_mkwrite(pte)	(__pte(pte_val(pte) | _PAGE_WRITE))
+#define pte_mkdirty(pte)	(__pte(pte_val(pte) | _PAGE_MODIFIED | _PAGE_W))
+
+/* 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)
+
+/* extract the pgd cache used for optimizing the tlb miss
+ * slow path when executing 32-bit compat processes
+ */
+#define get_pgd_cache(pgd)	((unsigned long) pgd_val(*pgd) << 11)
+
+/* Find an entry in the second-level page table.. */
+#define pmd_offset(pudp, address)	\
+	((pmd_t *) pud_page(*(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.
+	 */
+	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))
+
+extern pgd_t swapper_pg_dir[1];
+
+/* 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);
+
+/* Make a non-present pseudo-TTE. */
+static inline pte_t mk_pte_io(unsigned long page, pgprot_t prot, int space)
+{
+	pte_t pte;
+	pte_val(pte) = (((page) | pgprot_val(prot) | _PAGE_E) &
+			~(unsigned long)_PAGE_CACHE);
+	pte_val(pte) |= (((unsigned long)space) << 32);
+	return pte;
+}
+
+/* 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. */
+#define pte_file(pte)		(pte_val(pte) & _PAGE_FILE)
+#define pte_to_pgoff(pte)	(pte_val(pte) >> PAGE_SHIFT)
+#define pgoff_to_pte(off)	(__pte(((off) << PAGE_SHIFT) | _PAGE_FILE))
+#define PTE_FILE_MAX_BITS	(64UL - PAGE_SHIFT - 1UL)
+
+extern unsigned long prom_virt_to_phys(unsigned long, int *);
+
+static __inline__ unsigned long
+sun4u_get_pte (unsigned long addr)
+{
+	pgd_t *pgdp;
+	pud_t *pudp;
+	pmd_t *pmdp;
+	pte_t *ptep;
+
+	if (addr >= PAGE_OFFSET)
+		return addr & _PAGE_PADDR;
+	if ((addr >= LOW_OBP_ADDRESS) && (addr < HI_OBP_ADDRESS))
+		return prom_virt_to_phys(addr, NULL);
+	pgdp = pgd_offset_k(addr);
+	pudp = pud_offset(pgdp, addr);
+	pmdp = pmd_offset(pudp, addr);
+	ptep = pte_offset_kernel(pmdp, addr);
+	return pte_val(*ptep) & _PAGE_PADDR;
+}
+
+static __inline__ unsigned long
+__get_phys (unsigned long addr)
+{
+	return sun4u_get_pte (addr);
+}
+
+static __inline__ int
+__get_iospace (unsigned long addr)
+{
+	return ((sun4u_get_pte (addr) & 0xf0000000) >> 28);
+}
+
+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 io_remap_page_range(struct vm_area_struct *vma, unsigned long from,
+			       unsigned long offset,
+			       unsigned long size, pgprot_t prot, int space);
+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)
+
+/* Override for {pgd,pmd}_addr_end() to deal with the virtual address
+ * space hole.  We simply sign extend bit 43.
+ */
+#define pgd_addr_end(addr, end)						\
+({	unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK;	\
+	__boundary = ((long) (__boundary << 20)) >> 20;			\
+	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
+})
+
+#define pmd_addr_end(addr, end)						\
+({	unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK;	\
+	__boundary = ((long) (__boundary << 20)) >> 20;			\
+	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
+})
+
+#include <asm-generic/pgtable.h>
+
+/* We provide our own get_unmapped_area to cope with VA holes for userland */
+#define HAVE_ARCH_UNMAPPED_AREA
+
+/* 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
+
+/*
+ * No page table caches to initialise
+ */
+#define pgtable_cache_init()	do { } while (0)
+
+extern void check_pgt_cache(void);
+
+#endif /* !(__ASSEMBLY__) */
+
+#endif /* !(_SPARC64_PGTABLE_H) */