pgtable.h

来自「Linux Kernel 2.6.9 for OMAP1710」· C头文件 代码 · 共 443 行 · 第 1/2 页

/* $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 <linux/config.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	11

/* 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))

#ifndef __ASSEMBLY__

#include <linux/sched.h>

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

/* We the first one in this file, what we export to the kernel
 * is different so we can optimize correctly for 32-bit tasks.
 */
#define REAL_PTRS_PER_PMD	(1UL << PMD_BITS)

/* This is gross, but unless we do this gcc retests the
 * thread flag every interation in pmd traversal loops.
 */
extern unsigned long __ptrs_per_pmd(void) __attribute_const__;
#define PTRS_PER_PMD		__ptrs_per_pmd()

/*
 * We cannot use the top address range because VPTE table lives there. This
 * formula finds the total legal virtual space in the processor, subtracts the
 * vpte size, then aligns it to the number of bytes mapped by one pgde, and
 * thus calculates the number of pgdes needed.
 */
#define PTRS_PER_PGD (((1UL << VA_BITS) - VPTE_SIZE + (1UL << (PAGE_SHIFT + \
		      (PAGE_SHIFT-3) + PMD_BITS)) - 1) / (1UL << (PAGE_SHIFT + \
		      (PAGE_SHIFT-3) + PMD_BITS)))

/* Kernel has a separate 44bit address space. */
#define USER_PTRS_PER_PGD	((const int)(test_thread_flag(TIF_32BIT)) ? \
				 (1) : (PTRS_PER_PGD))
#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