[deliverable/linux.git] / include / asm-sparc64 / pgtable.h

/* $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 --> 32MB).
 * The page copy blockops can use 0x2000000 to 0x10000000.
 * 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(0x0000000002000000,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)

/* 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__) */

/* 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(0x0002000000000000,UL) /* Reserved               */
#define _PAGE_SZ32MB	_AC(0x0001000000000000,UL) /* (Panther) 32MB page    */
#define _PAGE_SZ256MB	_AC(0x2001000000000000,UL) /* (Panther) 256MB page   */
#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))

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))
#define pte_mkhuge(pte)		(__pte(pte_val(pte) | _PAGE_SZHUGE))

/* 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[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);

/* 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_pfn_range(struct vm_area_struct *vma, unsigned long from,
			       unsigned long pfn,
			       unsigned long size, pgprot_t prot);

/* Clear virtual and physical cachability, set side-effect bit.  */
#define pgprot_noncached(prot) \
	(__pgprot((pgprot_val(prot) & ~(_PAGE_CP | _PAGE_CV)) | \
	 _PAGE_E))

/*
 * 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 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) */
Commit	Line	Data
1da177e4 LT	1	/* $Id: pgtable.h,v 1.156 2002/02/09 19:49:31 davem Exp $
	2	* pgtable.h: SpitFire page table operations.
	3	*
	4	* Copyright 1996,1997 David S. Miller (davem@caip.rutgers.edu)
	5	* Copyright 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	6	*/
	7
	8	#ifndef _SPARC64_PGTABLE_H
	9	#define _SPARC64_PGTABLE_H
	10
	11	/* This file contains the functions and defines necessary to modify and use
	12	* the SpitFire page tables.
	13	*/
	14
	15	#include <asm-generic/pgtable-nopud.h>
	16
	17	#include <linux/config.h>
	18	#include <linux/compiler.h>
	19	#include <asm/types.h>
	20	#include <asm/spitfire.h>
	21	#include <asm/asi.h>
	22	#include <asm/system.h>
	23	#include <asm/page.h>
	24	#include <asm/processor.h>
	25	#include <asm/const.h>
	26
729b4f7d DM	27	/* The kernel image occupies 0x4000000 to 0x1000000 (4MB --> 32MB).
729b4f7d DM	28	* The page copy blockops can use 0x2000000 to 0x10000000.
1da177e4	29	* The PROM resides in an area spanning 0xf0000000 to 0x100000000.
729b4f7d DM	30	* The vmalloc area spans 0x100000000 to 0x200000000.
	31	* Since modules need to be in the lowest 32-bits of the address space,
	32	* we place them right before the OBP area from 0x10000000 to 0xf0000000.
1da177e4 LT	33	* There is a single static kernel PMD which maps from 0x0 to address
	34	* 0x400000000.
	35	*/
729b4f7d DM	36	#define TLBTEMP_BASE _AC(0x0000000002000000,UL)
	37	#define MODULES_VADDR _AC(0x0000000010000000,UL)
	38	#define MODULES_LEN _AC(0x00000000e0000000,UL)
	39	#define MODULES_END _AC(0x00000000f0000000,UL)
1da177e4 LT	40	#define LOW_OBP_ADDRESS _AC(0x00000000f0000000,UL)
1da177e4 LT	41	#define HI_OBP_ADDRESS _AC(0x0000000100000000,UL)
729b4f7d DM	42	#define VMALLOC_START _AC(0x0000000100000000,UL)
729b4f7d DM	43	#define VMALLOC_END _AC(0x0000000200000000,UL)
1da177e4 LT	44
	45	/* XXX All of this needs to be rethought so we can take advantage
	46	* XXX cheetah's full 64-bit virtual address space, ie. no more hole
	47	* XXX in the middle like on spitfire. -DaveM
	48	*/
	49	/*
	50	* Given a virtual address, the lowest PAGE_SHIFT bits determine offset
	51	* into the page; the next higher PAGE_SHIFT-3 bits determine the pte#
	52	* in the proper pagetable (the -3 is from the 8 byte ptes, and each page
	53	* table is a single page long). The next higher PMD_BITS determine pmd#
	54	* in the proper pmdtable (where we must have PMD_BITS <= (PAGE_SHIFT-2)
	55	* since the pmd entries are 4 bytes, and each pmd page is a single page
	56	* long). Finally, the higher few bits determine pgde#.
	57	*/
	58
	59	/* PMD_SHIFT determines the size of the area a second-level page
	60	* table can map
	61	*/
	62	#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3))
56425306	63	#define PMD_SIZE (_AC(1,UL) << PMD_SHIFT)
1da177e4 LT	64	#define PMD_MASK (~(PMD_SIZE-1))
	65	#define PMD_BITS (PAGE_SHIFT - 2)
	66
	67	/* PGDIR_SHIFT determines what a third-level page table entry can map */
	68	#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3) + PMD_BITS)
56425306	69	#define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT)
1da177e4 LT	70	#define PGDIR_MASK (~(PGDIR_SIZE-1))
	71	#define PGDIR_BITS (PAGE_SHIFT - 2)
	72
	73	#ifndef __ASSEMBLY__
	74
	75	#include <linux/sched.h>
	76
	77	/* Entries per page directory level. */
	78	#define PTRS_PER_PTE (1UL << (PAGE_SHIFT-3))
	79	#define PTRS_PER_PMD (1UL << PMD_BITS)
	80	#define PTRS_PER_PGD (1UL << PGDIR_BITS)
	81
	82	/* Kernel has a separate 44bit address space. */
d455a369	83	#define FIRST_USER_ADDRESS 0
1da177e4 LT	84
	85	#define pte_ERROR(e) __builtin_trap()
	86	#define pmd_ERROR(e) __builtin_trap()
	87	#define pgd_ERROR(e) __builtin_trap()
	88
	89	#endif /* !(__ASSEMBLY__) */
	90
	91	/* Spitfire/Cheetah TTE bits. */
	92	#define _PAGE_VALID _AC(0x8000000000000000,UL) /* Valid TTE */
	93	#define _PAGE_R _AC(0x8000000000000000,UL) /* Keep ref bit up to date*/
	94	#define _PAGE_SZ4MB _AC(0x6000000000000000,UL) /* 4MB Page */
	95	#define _PAGE_SZ512K _AC(0x4000000000000000,UL) /* 512K Page */
	96	#define _PAGE_SZ64K _AC(0x2000000000000000,UL) /* 64K Page */
	97	#define _PAGE_SZ8K _AC(0x0000000000000000,UL) /* 8K Page */
	98	#define _PAGE_NFO _AC(0x1000000000000000,UL) /* No Fault Only */
	99	#define _PAGE_IE _AC(0x0800000000000000,UL) /* Invert Endianness */
	100	#define _PAGE_SOFT2 _AC(0x07FC000000000000,UL) /* Software bits, set 2 */
f16af555 DM	101	#define _PAGE_RES1 _AC(0x0002000000000000,UL) /* Reserved */
	102	#define _PAGE_SZ32MB _AC(0x0001000000000000,UL) /* (Panther) 32MB page */
	103	#define _PAGE_SZ256MB _AC(0x2001000000000000,UL) /* (Panther) 256MB page */
1da177e4 LT	104	#define _PAGE_SN _AC(0x0000800000000000,UL) /* (Cheetah) Snoop */
	105	#define _PAGE_RES2 _AC(0x0000780000000000,UL) /* Reserved */
	106	#define _PAGE_PADDR_SF _AC(0x000001FFFFFFE000,UL) /* (Spitfire) paddr[40:13]*/
	107	#define _PAGE_PADDR _AC(0x000007FFFFFFE000,UL) /* (Cheetah) paddr[42:13] */
	108	#define _PAGE_SOFT _AC(0x0000000000001F80,UL) /* Software bits */
	109	#define _PAGE_L _AC(0x0000000000000040,UL) /* Locked TTE */
	110	#define _PAGE_CP _AC(0x0000000000000020,UL) /* Cacheable in P-Cache */
	111	#define _PAGE_CV _AC(0x0000000000000010,UL) /* Cacheable in V-Cache */
	112	#define _PAGE_E _AC(0x0000000000000008,UL) /* side-Effect */
	113	#define _PAGE_P _AC(0x0000000000000004,UL) /* Privileged Page */
	114	#define _PAGE_W _AC(0x0000000000000002,UL) /* Writable */
	115	#define _PAGE_G _AC(0x0000000000000001,UL) /* Global */
	116
	117	/* Here are the SpitFire software bits we use in the TTE's.
	118	*
	119	* WARNING: If you are going to try and start using some
	120	* of the soft2 bits, you will need to make
	121	* modifications to the swap entry implementation.
	122	* For example, one thing that could happen is that
	123	* swp_entry_to_pte() would BUG_ON() if you tried
	124	* to use one of the soft2 bits for _PAGE_FILE.
	125	*
	126	* Like other architectures, I have aliased _PAGE_FILE with
	127	* _PAGE_MODIFIED. This works because _PAGE_FILE is never
	128	* interpreted that way unless _PAGE_PRESENT is clear.
	129	*/
	130	#define _PAGE_EXEC _AC(0x0000000000001000,UL) /* Executable SW bit */
	131	#define _PAGE_MODIFIED _AC(0x0000000000000800,UL) /* Modified (dirty) */
	132	#define _PAGE_FILE _AC(0x0000000000000800,UL) /* Pagecache page */
	133	#define _PAGE_ACCESSED _AC(0x0000000000000400,UL) /* Accessed (ref'd) */
	134	#define _PAGE_READ _AC(0x0000000000000200,UL) /* Readable SW Bit */
	135	#define _PAGE_WRITE _AC(0x0000000000000100,UL) /* Writable SW Bit */
	136	#define _PAGE_PRESENT _AC(0x0000000000000080,UL) /* Present */
	137
	138	#if PAGE_SHIFT == 13
	139	#define _PAGE_SZBITS _PAGE_SZ8K
	140	#elif PAGE_SHIFT == 16
	141	#define _PAGE_SZBITS _PAGE_SZ64K
	142	#elif PAGE_SHIFT == 19
	143	#define _PAGE_SZBITS _PAGE_SZ512K
	144	#elif PAGE_SHIFT == 22
	145	#define _PAGE_SZBITS _PAGE_SZ4MB
	146	#else
	147	#error Wrong PAGE_SHIFT specified
	148	#endif
	149
	150	#if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
	151	#define _PAGE_SZHUGE _PAGE_SZ4MB
	152	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
	153	#define _PAGE_SZHUGE _PAGE_SZ512K
	154	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
	155	#define _PAGE_SZHUGE _PAGE_SZ64K
	156	#endif
	157
	158	#define _PAGE_CACHE (_PAGE_CP \| _PAGE_CV)
	159
	160	#define __DIRTY_BITS (_PAGE_MODIFIED \| _PAGE_WRITE \| _PAGE_W)
	161	#define __ACCESS_BITS (_PAGE_ACCESSED \| _PAGE_READ \| _PAGE_R)
	162	#define __PRIV_BITS _PAGE_P
	163
	164	#define PAGE_NONE __pgprot (_PAGE_PRESENT \| _PAGE_ACCESSED \| _PAGE_CACHE)
	165
	166	/* Don't set the TTE _PAGE_W bit here, else the dirty bit never gets set. */
	167	#define PAGE_SHARED __pgprot (_PAGE_PRESENT \| _PAGE_VALID \| _PAGE_CACHE \| \
168	__ACCESS_BITS \| _PAGE_WRITE \| _PAGE_EXEC)
169
170	#define PAGE_COPY __pgprot (_PAGE_PRESENT \| _PAGE_VALID \| _PAGE_CACHE \| \
171	__ACCESS_BITS \| _PAGE_EXEC)
172
173	#define PAGE_READONLY __pgprot (_PAGE_PRESENT \| _PAGE_VALID \| _PAGE_CACHE \| \
174	__ACCESS_BITS \| _PAGE_EXEC)
175
176	#define PAGE_KERNEL __pgprot (_PAGE_PRESENT \| _PAGE_VALID \| _PAGE_CACHE \| \
177	__PRIV_BITS \| \
178	__ACCESS_BITS \| __DIRTY_BITS \| _PAGE_EXEC)
179
180	#define PAGE_SHARED_NOEXEC __pgprot (_PAGE_PRESENT \| _PAGE_VALID \| \
181	_PAGE_CACHE \| \
182	__ACCESS_BITS \| _PAGE_WRITE)
183
184	#define PAGE_COPY_NOEXEC __pgprot (_PAGE_PRESENT \| _PAGE_VALID \| \
185	_PAGE_CACHE \| __ACCESS_BITS)
186
187	#define PAGE_READONLY_NOEXEC __pgprot (_PAGE_PRESENT \| _PAGE_VALID \| \
188	_PAGE_CACHE \| __ACCESS_BITS)
189
190	#define _PFN_MASK _PAGE_PADDR
191
192	#define pg_iobits (_PAGE_VALID \| _PAGE_PRESENT \| __DIRTY_BITS \| \
193	__ACCESS_BITS \| _PAGE_E)
194
195	#define __P000 PAGE_NONE
196	#define __P001 PAGE_READONLY_NOEXEC
197	#define __P010 PAGE_COPY_NOEXEC
198	#define __P011 PAGE_COPY_NOEXEC
199	#define __P100 PAGE_READONLY
200	#define __P101 PAGE_READONLY
201	#define __P110 PAGE_COPY
202	#define __P111 PAGE_COPY
203
204	#define __S000 PAGE_NONE
205	#define __S001 PAGE_READONLY_NOEXEC
206	#define __S010 PAGE_SHARED_NOEXEC
207	#define __S011 PAGE_SHARED_NOEXEC
208	#define __S100 PAGE_READONLY
209	#define __S101 PAGE_READONLY
210	#define __S110 PAGE_SHARED
211	#define __S111 PAGE_SHARED
212
213	#ifndef __ASSEMBLY__
214
215	extern unsigned long phys_base;
216	extern unsigned long pfn_base;
217
218	extern struct page *mem_map_zero;
219	#define ZERO_PAGE(vaddr) (mem_map_zero)
220
221	/* PFNs are real physical page numbers. However, mem_map only begins to record
222	* per-page information starting at pfn_base. This is to handle systems where
223	* the first physical page in the machine is at some huge physical address,
224	* such as 4GB. This is common on a partitioned E10000, for example.
225	*/
226
227	#define pfn_pte(pfn, prot) \
228	__pte(((pfn) << PAGE_SHIFT) \| pgprot_val(prot) \| _PAGE_SZBITS)
229	#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
230
231	#define pte_pfn(x) ((pte_val(x) & _PAGE_PADDR)>>PAGE_SHIFT)
232	#define pte_page(x) pfn_to_page(pte_pfn(x))
233
1da177e4 LT	234	static inline pte_t pte_modify(pte_t orig_pte, pgprot_t new_prot)
	235	{
	236	pte_t __pte;
	237	const unsigned long preserve_mask = (_PFN_MASK \|
	238	_PAGE_MODIFIED \| _PAGE_ACCESSED \|
	239	_PAGE_CACHE \| _PAGE_E \|
	240	_PAGE_PRESENT \| _PAGE_SZBITS);
	241
	242	pte_val(__pte) = (pte_val(orig_pte) & preserve_mask) \|
	243	(pgprot_val(new_prot) & ~preserve_mask);
	244
	245	return __pte;
	246	}
	247	#define pmd_set(pmdp, ptep) \
	248	(pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> 11UL))
	249	#define pud_set(pudp, pmdp) \
	250	(pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> 11UL))
	251	#define __pmd_page(pmd) \
	252	((unsigned long) __va((((unsigned long)pmd_val(pmd))<<11UL)))
	253	#define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd))
	254	#define pud_page(pud) \
	255	((unsigned long) __va((((unsigned long)pud_val(pud))<<11UL)))
	256	#define pte_none(pte) (!pte_val(pte))
	257	#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
	258	#define pmd_none(pmd) (!pmd_val(pmd))
	259	#define pmd_bad(pmd) (0)
	260	#define pmd_present(pmd) (pmd_val(pmd) != 0U)
	261	#define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0U)
	262	#define pud_none(pud) (!pud_val(pud))
	263	#define pud_bad(pud) (0)
	264	#define pud_present(pud) (pud_val(pud) != 0U)
	265	#define pud_clear(pudp) (pud_val(*(pudp)) = 0U)
	266
	267	/* The following only work if pte_present() is true.
	268	* Undefined behaviour if not..
	269	*/
	270	#define pte_read(pte) (pte_val(pte) & _PAGE_READ)
	271	#define pte_exec(pte) (pte_val(pte) & _PAGE_EXEC)
	272	#define pte_write(pte) (pte_val(pte) & _PAGE_WRITE)
	273	#define pte_dirty(pte) (pte_val(pte) & _PAGE_MODIFIED)
	274	#define pte_young(pte) (pte_val(pte) & _PAGE_ACCESSED)
	275	#define pte_wrprotect(pte) (__pte(pte_val(pte) & ~(_PAGE_WRITE\|_PAGE_W)))
	276	#define pte_rdprotect(pte) \
	277	(__pte(((pte_val(pte)<<1UL)>>1UL) & ~_PAGE_READ))
	278	#define pte_mkclean(pte) \
	279	(__pte(pte_val(pte) & ~(_PAGE_MODIFIED\|_PAGE_W)))
	280	#define pte_mkold(pte) \
	281	(__pte(((pte_val(pte)<<1UL)>>1UL) & ~_PAGE_ACCESSED))
	282
	283	/* Permanent address of a page. */
	284	#define __page_address(page) page_address(page)
	285
	286	/* Be very careful when you change these three, they are delicate. */
	287	#define pte_mkyoung(pte) (__pte(pte_val(pte) \| _PAGE_ACCESSED \| _PAGE_R))
	288	#define pte_mkwrite(pte) (__pte(pte_val(pte) \| _PAGE_WRITE))
	289	#define pte_mkdirty(pte) (__pte(pte_val(pte) \| _PAGE_MODIFIED \| _PAGE_W))
63551ae0	290	#define pte_mkhuge(pte) (__pte(pte_val(pte) \| _PAGE_SZHUGE))
1da177e4 LT	291
	292	/* to find an entry in a page-table-directory. */
	293	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
	294	#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
	295
	296	/* to find an entry in a kernel page-table-directory */
	297	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
	298
	299	/* extract the pgd cache used for optimizing the tlb miss
	300	* slow path when executing 32-bit compat processes
	301	*/
	302	#define get_pgd_cache(pgd) ((unsigned long) pgd_val(*pgd) << 11)
	303
	304	/* Find an entry in the second-level page table.. */
	305	#define pmd_offset(pudp, address) \
	306	((pmd_t ) pud_page((pudp)) + \
	307	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)))
	308
	309	/* Find an entry in the third-level page table.. */
	310	#define pte_index(dir, address) \
	311	((pte_t ) __pmd_page((dir)) + \
	312	((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
	313	#define pte_offset_kernel pte_index
	314	#define pte_offset_map pte_index
	315	#define pte_offset_map_nested pte_index
	316	#define pte_unmap(pte) do { } while (0)
	317	#define pte_unmap_nested(pte) do { } while (0)
	318
	319	/* Actual page table PTE updates. */
	320	extern void tlb_batch_add(struct mm_struct mm, unsigned long vaddr, pte_t ptep, pte_t orig);
	321
	322	static inline void set_pte_at(struct mm_struct mm, unsigned long addr, pte_t ptep, pte_t pte)
	323	{
	324	pte_t orig = *ptep;
	325
	326	*ptep = pte;
	327
	328	/* It is more efficient to let flush_tlb_kernel_range()
	329	* handle init_mm tlb flushes.
	330	*/
	331	if (likely(mm != &init_mm) && (pte_val(orig) & _PAGE_VALID))
	332	tlb_batch_add(mm, addr, ptep, orig);
	333	}
	334
	335	#define pte_clear(mm,addr,ptep) \
	336	set_pte_at((mm), (addr), (ptep), __pte(0UL))
	337
56425306 DM	338	extern pgd_t swapper_pg_dir[2048];
56425306 DM	339	extern pmd_t swapper_low_pmd_dir[2048];
1da177e4	340
801ab3c7	341	extern void paging_init(void);
10147570	342	extern unsigned long find_ecache_flush_span(unsigned long size);
801ab3c7	343
1da177e4 LT	344	/* These do nothing with the way I have things setup. */
	345	#define mmu_lockarea(vaddr, len) (vaddr)
	346	#define mmu_unlockarea(vaddr, len) do { } while(0)
	347
	348	struct vm_area_struct;
	349	extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
	350
	351	/* Make a non-present pseudo-TTE. */
	352	static inline pte_t mk_pte_io(unsigned long page, pgprot_t prot, int space)
	353	{
	354	pte_t pte;
	355	pte_val(pte) = (((page) \| pgprot_val(prot) \| _PAGE_E) &
	356	~(unsigned long)_PAGE_CACHE);
	357	pte_val(pte) \|= (((unsigned long)space) << 32);
	358	return pte;
	359	}
	360
	361	/* Encode and de-code a swap entry */
	362	#define __swp_type(entry) (((entry).val >> PAGE_SHIFT) & 0xffUL)
	363	#define __swp_offset(entry) ((entry).val >> (PAGE_SHIFT + 8UL))
	364	#define __swp_entry(type, offset) \
	365	( (swp_entry_t) \
	366	{ \
	367	(((long)(type) << PAGE_SHIFT) \| \
	368	((long)(offset) << (PAGE_SHIFT + 8UL))) \
	369	} )
	370	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	371	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	372
	373	/* File offset in PTE support. */
	374	#define pte_file(pte) (pte_val(pte) & _PAGE_FILE)
	375	#define pte_to_pgoff(pte) (pte_val(pte) >> PAGE_SHIFT)
	376	#define pgoff_to_pte(off) (__pte(((off) << PAGE_SHIFT) \| _PAGE_FILE))
	377	#define PTE_FILE_MAX_BITS (64UL - PAGE_SHIFT - 1UL)
	378
	379	extern unsigned long prom_virt_to_phys(unsigned long, int *);
	380
	381	static __inline__ unsigned long
	382	sun4u_get_pte (unsigned long addr)
	383	{
	384	pgd_t *pgdp;
	385	pud_t *pudp;
	386	pmd_t *pmdp;
	387	pte_t *ptep;
	388
	389	if (addr >= PAGE_OFFSET)
	390	return addr & _PAGE_PADDR;
	391	if ((addr >= LOW_OBP_ADDRESS) && (addr < HI_OBP_ADDRESS))
	392	return prom_virt_to_phys(addr, NULL);
	393	pgdp = pgd_offset_k(addr);
	394	pudp = pud_offset(pgdp, addr);
	395	pmdp = pmd_offset(pudp, addr);
	396	ptep = pte_offset_kernel(pmdp, addr);
	397	return pte_val(*ptep) & _PAGE_PADDR;
	398	}
	399
	400	static __inline__ unsigned long
	401	__get_phys (unsigned long addr)
	402	{
	403	return sun4u_get_pte (addr);
	404	}
	405
	406	static __inline__ int
	407	__get_iospace (unsigned long addr)
408	{
409	return ((sun4u_get_pte (addr) & 0xf0000000) >> 28);
410	}
411
412	extern unsigned long *sparc64_valid_addr_bitmap;
413
414	/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
415	#define kern_addr_valid(addr) \
416	(test_bit(__pa((unsigned long)(addr))>>22, sparc64_valid_addr_bitmap))
417
1da177e4 LT	418	extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
	419	unsigned long pfn,
	420	unsigned long size, pgprot_t prot);
	421
d7be828e DM	422	/* Clear virtual and physical cachability, set side-effect bit. */
	423	#define pgprot_noncached(prot) \
	424	(__pgprot((pgprot_val(prot) & ~(_PAGE_CP \| _PAGE_CV)) \| \
	425	_PAGE_E))
	426
1da177e4 LT	427	/*
	428	* For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
	429	* its high 4 bits. These macros/functions put it there or get it from there.
	430	*/
	431	#define MK_IOSPACE_PFN(space, pfn) (pfn \| (space << (BITS_PER_LONG - 4)))
	432	#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
	433	#define GET_PFN(pfn) (pfn & 0x0fffffffffffffffUL)
	434
1da177e4 LT	435	#include <asm-generic/pgtable.h>
	436
	437	/* We provide our own get_unmapped_area to cope with VA holes for userland */
	438	#define HAVE_ARCH_UNMAPPED_AREA
	439
	440	/* We provide a special get_unmapped_area for framebuffer mmaps to try and use
	441	* the largest alignment possible such that larget PTEs can be used.
	442	*/
	443	extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
	444	unsigned long, unsigned long,
	445	unsigned long);
	446	#define HAVE_ARCH_FB_UNMAPPED_AREA
	447
	448	/*
	449	* No page table caches to initialise
	450	*/
	451	#define pgtable_cache_init() do { } while (0)
	452
	453	extern void check_pgt_cache(void);
	454
	455	#endif /* !(__ASSEMBLY__) */
	456
	457	#endif /* !(_SPARC64_PGTABLE_H) */