pgtable.h

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/* $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 ([e-mail])
 * Copyright 1997,1998 Jakub Jelinek ([e-mail])
 */

#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 0x1000000 (4MB --> 32MB).
 * The page copy blockops can use 0x2000000 to 0x4000000.
 * The TSB is mapped in the 0x4000000 to 0x6000000 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(0x0000000002000000,UL)
#define	TSBMAP_BASE		_AC(0x0000000004000000,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
#elif PAGE_SHIFT == 19
#define _PAGE_SZBITS_4U	_PAGE_SZ512K_4U
#define _PAGE_SZBITS_4V	_PAGE_SZ512K_4V
#elif PAGE_SHIFT == 22
#define _PAGE_SZBITS_4U	_PAGE_SZ4MB_4U
#define _PAGE_SZBITS_4V	_PAGE_SZ4MB_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"