/*****************************************************************************************
Copyright (c) 2002-2004,c 009 The UbixOS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of
conditions, the following disclaimer and the list of authors. Redistributions in binary
form must reproduce the above copyright notice, this list of conditions, the following
disclaimer and the list of authors in the documentation and/or other materials provided
with the distribution. Neither the name of the UbixOS Project nor the names of its
contributors may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
$Id$
*****************************************************************************************/
#include <vmm/vmm.h>
/************************************************************************
Function: void vmmUnmapPages(u_int32_t pageAddr,int flags);
Description: This Function Will Unmap A Page From The Kernel VM Space
The Flags Variable Decides If Its To Free The Page Or Not
A Flag Of 0 Will Free It And A Flag Of 1 Will Keep It
Notes:
07/30/02 - I Have Decided That This Should Free The Physical Page There
Is No Reason To Keep It Marked As Not Available
07/30/02 - Ok A Found A Reason To Keep It Marked As Available I Admit
Even I Am Not Perfect Ok The Case Where You Wouldn't Want To
Free It Would Be On Something Like Where I Allocated A Page
To Create A New Virtual Space So Now It Has A Flag
************************************************************************/
void vmm_unmapPages(u_int32_t addr,u_int32_t count,u_int16_t flags) {
u_int32_t baseAddr = (u_int32_t)addr & 0xFFFFF000;
u_int32_t dI = 0x0;
u_int32_t tI = 0x0;
u_int32_t y = 0x0;
u_int32_t *pageTable = 0x0;
dI = PDI(baseAddr);
tI = PTI(baseAddr);
pageTable = (u_int32_t *)PARENT_PAGEDIR_ADDR;
if ((pageTable[dI] & PAGE_PRESENT) != PAGE_PRESENT) {
#ifdef VMMDEBUG
kprintf("vmm_unmapPages: page not present - 0x%X",addr);
#endif
return;
}
pageTable = (u_int32_t *)(PAGE_TABLES_BASE_ADDR + (4096*dI));
for (y = tI;y <= (tI + count);y++) {
if (flags == 0)
if ((pageTable[y] & PAGE_PRESENT) == PAGE_PRESENT)
vmm_freePage((u_int32_t)(pageTable[y] & 0xFFFFF000));
pageTable[y] = 0x0;
}
/* Rehash The Page Directory */
asm volatile(
"movl %cr3,%eax\n"
"movl %eax,%cr3\n"
);
return;
}
/***
$Log$
Revision 1.4 2009/07/09 04:01:15 reddawg
More Sanity Checks
Revision 1.3 2009/07/08 16:06:37 reddawg
Trying To Hunt Down Bugs
Revision 1.2 2009/07/08 16:05:56 reddawg
Sync
Revision 1.1.1.1 2007/01/17 03:31:51 reddawg
UbixOS
Revision 1.1.1.1 2006/06/01 12:46:13 reddawg
ubix2
Revision 1.2 2005/10/12 00:13:38 reddawg
Removed
Revision 1.1.1.1 2005/09/26 17:24:54 reddawg
no message
Revision 1.4 2004/07/26 19:15:49 reddawg
test code, fixes and the like
Revision 1.3 2004/06/15 12:35:05 reddawg
Cleaned Up
Revision 1.2 2004/06/10 22:23:56 reddawg
Volatiles
Revision 1.1.1.1 2004/04/15 12:06:53 reddawg
UbixOS v1.0
Revision 1.7 2004/04/13 16:36:34 reddawg
Changed our copyright, it is all now under a BSD-Style license
END
***/
