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/*
* Creation Date: <2000/09/07 20:36:54 samuel>
* Time-stamp: <2001/04/15 14:06:25 samuel>
*
* <mmu_tracker.c>
*
* Keeps track of dirty RAM pages
*
* Copyright (C) 2000, 2001 Samuel Rydh (samuel@ibrium.se)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation
*
*/
#include <linux/sys.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include "mmu.h"
typedef struct tracker_data {
char *table;
size_t table_size;
int npages;
char *lvbase;
} tracker_data_t;
#define MMU (kv->mmu)
#define DECLARE_TS tracker_data_t *ts = MMU.tracker_data
/************************************************************************/
/* F U N C T I O N S */
/************************************************************************/
int
init_mmu_tracker( kernel_vars_t *kv )
{
/* track_lvrange does the initialization */
return 0;
}
void
cleanup_mmu_tracker( kernel_vars_t *kv )
{
DECLARE_TS;
if( !ts )
return;
if( ts->table )
vfree( ts->table );
kfree( ts );
MMU.tracker_data = NULL;
}
int
track_lvrange( kernel_vars_t *kv, char *lvbase, size_t size )
{
DECLARE_TS;
if( ts )
cleanup_mmu_tracker( kv );
if( !size )
return 0;
if( !(ts=kmalloc( sizeof(tracker_data_t), GFP_KERNEL )) )
return 1;
memset( ts, 0, sizeof(tracker_data_t) );
MMU.tracker_data = ts;
ts->npages = size >> 12;
ts->table_size = (ts->npages+7)/8;
ts->lvbase = lvbase;
if( !(ts->table=vmalloc( ts->table_size )) ) {
cleanup_mmu_tracker( kv );
return 1;
}
memset( ts->table, 0, ts->table_size );
return 0;
}
void
lvpage_dirty( kernel_vars_t *kv, char *lvbase )
{
DECLARE_TS;
int pgindex;
if( !ts )
return;
pgindex = (ulong)(lvbase - ts->lvbase) >> 12;
if( pgindex >=0 && pgindex < ts->npages )
ts->table[pgindex >> 3] |= (1 << (pgindex & 7));
}
size_t
get_track_buffer( kernel_vars_t *kv, char *retbuf )
{
DECLARE_TS;
if( !ts )
return 0;
if( !retbuf )
return ts->table_size;
if( verify_area( VERIFY_WRITE, retbuf, ts->table_size ) ){
printk("get_track_buffer: Bad access\n");
return 0;
}
memcpy( retbuf, ts->table, ts->table_size );
return ts->table_size;
}
void
set_track_buffer( kernel_vars_t *kv, char *buf )
{
DECLARE_TS;
if( !ts || !buf ) {
printk("set_track_buffer: error\n");
return;
}
if( verify_area( VERIFY_READ, buf, ts->table_size ) ){
printk("set_track_buffer: Bad access\n");
return;
}
memcpy( ts->table, buf, ts->table_size );
}
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