ptab_dump.c

来自「基于组件方式开发操作系统的OSKIT源代码」· C语言 代码 · 共 60 行

/*
 * Copyright (c) 1996, 1998, 2001 University of Utah and the Flux Group.
 * All rights reserved.
 * 
 * This file is part of the Flux OSKit.  The OSKit is free software, also known
 * as "open source;" you can redistribute it and/or modify it under the terms
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF).  To explore alternate licensing terms, contact
 * the University of Utah at [e-mail] or [phone].
 * 
 * The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GPL for more details.  You should have
 * received a copy of the GPL along with the OSKit; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */

/* uvm uses unused bits of a page table.  this ptab_dump() shows them. */

#include <oskit/c/stdio.h>
#include <oskit/x86/base_paging.h>

void ptab_dump(oskit_addr_t ptab_pa, oskit_addr_t base_la)
{
	pt_entry_t *ptab = ptab_find_pte(ptab_pa, 0);
	unsigned ptn, ptm;

	for (ptn = 0; ptn < NPTES; ptn++)
	{
		/* Ignore invalid entries.  */
		if (!(ptab[ptn] & INTEL_PTE_VALID))
			continue;

		/* Scan for a contiguous range of page mappings.  */
		for (ptm = ptn+1; ptm < NPTES; ptm++)
		{
			if (ptab[ptm] != ptab[ptm-1] + 4096)
				break;
		}

		printf("\t\t%08x-%08x -> %08x-%08x%s%s%s%s%s%s%s%s%s\n",
			base_la + ptenum2lin(ptn),
			base_la + ptenum2lin(ptm)-1,
			pte_to_pa(ptab[ptn]),
			pte_to_pa(ptab[ptm-1]) + 4095,
			ptab[ptn] & INTEL_PTE_GLOBAL ? " GLOBAL" : "",
			ptab[ptn] & INTEL_PTE_MOD ? " MOD" : "",
			ptab[ptn] & INTEL_PTE_REF ? " REF" : "",
			ptab[ptn] & INTEL_PTE_NCACHE ? " NCACHE" : "",
			ptab[ptn] & INTEL_PTE_WTHRU ? " WTHRU" : "",
			ptab[ptn] & INTEL_PTE_USER ? " USER" : "",
		        ptab[ptn] & INTEL_PTE_WRITE ? " WRITE" : "",
		        ptab[ptn] & 0x200 ? " (wired)" : "",
		        ptab[ptn] & 0x400 ? " (pglist)" : "");

		ptn = ptm-1;
	}
}