Linux/Unix编程

开发平台：

Unix_Linux

pg-rm7k.c：源码内容

							/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
 * Copyright (C) 1997, 1998 Ralf Baechle ralf@gnu.org
 */
#include <linux/sched.h>
#include <linux/mm.h>
#include <asm/cacheops.h>
/*
 * Zero an entire page.  Note that while the RM7000 has a second level cache
 * it doesn't have a Create_Dirty_Excl_SD operation.
 */
void rm7k_clear_page(void * page)
{
	__asm__ __volatile__(
		".settnoreordernt"
		".settnoatnt"
		".settmips3nt"
		"addiut$1,%0,%2n"
		"1:tcachet%3,(%0)nt"
		"sdt$0,(%0)nt"
		"sdt$0,8(%0)nt"
		"sdt$0,16(%0)nt"
		"sdt$0,24(%0)nt"
		"addiut%0,64nt"
		"cachet%3,-32(%0)nt"
		"sdt$0,-32(%0)nt"
		"sdt$0,-24(%0)nt"
		"sdt$0,-16(%0)nt"
		"bnet$1,%0,1bnt"
		"sdt$0,-8(%0)nt"
		".settmips0nt"
		".settatnt"
		".settreorder"
		: "=r" (page)
		: "0" (page), "I" (PAGE_SIZE), "i" (Create_Dirty_Excl_D)
		: "memory");
}
/*
 * Copy an entire page.  Note that while the RM7000 has a second level cache
 * it doesn't have a Create_Dirty_Excl_SD operation.
 */
void rm7k_copy_page(void * to, void * from)
{
	unsigned long dummy1, dummy2;
	unsigned long reg1, reg2, reg3, reg4;
	__asm__ __volatile__(
		".settnoreordernt"
		".settnoatnt"
		".settmips3nt"
		"addiut$1,%0,%8n"
		"1:tcachet%9,(%0)nt"
		"lwt%2,(%1)nt"
		"lwt%3,4(%1)nt"
		"lwt%4,8(%1)nt"
		"lwt%5,12(%1)nt"
		"swt%2,(%0)nt"
		"swt%3,4(%0)nt"
		"swt%4,8(%0)nt"
		"swt%5,12(%0)nt"
		"lwt%2,16(%1)nt"
		"lwt%3,20(%1)nt"
		"lwt%4,24(%1)nt"
		"lwt%5,28(%1)nt"
		"swt%2,16(%0)nt"
		"swt%3,20(%0)nt"
		"swt%4,24(%0)nt"
		"swt%5,28(%0)nt"
		"cachet%9,32(%0)nt"
		"addiut%0,64nt"
		"addiut%1,64nt"
		"lwt%2,-32(%1)nt"
		"lwt%3,-28(%1)nt"
		"lwt%4,-24(%1)nt"
		"lwt%5,-20(%1)nt"
		"swt%2,-32(%0)nt"
		"swt%3,-28(%0)nt"
		"swt%4,-24(%0)nt"
		"swt%5,-20(%0)nt"
		"lwt%2,-16(%1)nt"
		"lwt%3,-12(%1)nt"
		"lwt%4,-8(%1)nt"
		"lwt%5,-4(%1)nt"
		"swt%2,-16(%0)nt"
		"swt%3,-12(%0)nt"
		"swt%4,-8(%0)nt"
		"bnet$1,%0,1bnt"
		"swt%5,-4(%0)nt"
		".settmips0nt"
		".settatnt"
		".settreorder"
		: "=r" (dummy1), "=r" (dummy2),
		  "=&r" (reg1), "=&r" (reg2), "=&r" (reg3), "=&r" (reg4)
		: "0" (to), "1" (from), "I" (PAGE_SIZE),
		 "i" (Create_Dirty_Excl_D));
}
void pgd_init(unsigned long page)
{
	unsigned long *p = (unsigned long *) page;
	int i;
	for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
		p[i + 0] = (unsigned long) invalid_pte_table;
		p[i + 1] = (unsigned long) invalid_pte_table;
		p[i + 2] = (unsigned long) invalid_pte_table;
		p[i + 3] = (unsigned long) invalid_pte_table;
		p[i + 4] = (unsigned long) invalid_pte_table;
		p[i + 5] = (unsigned long) invalid_pte_table;
		p[i + 6] = (unsigned long) invalid_pte_table;
		p[i + 7] = (unsigned long) invalid_pte_table;
	}
}

						