UbixOS  2.0
setpageattributes.c
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1 /*-
2  * Copyright (c) 2002-2018 The UbixOS Project.
3  * All rights reserved.
4  *
5  * This was developed by Christopher W. Olsen for the UbixOS Project.
6  *
7  * Redistribution and use in source and binary forms, with or without modification, are permitted
8  * provided that the following conditions are met:
9  *
10  * 1) Redistributions of source code must retain the above copyright notice, this list of
11  * conditions, the following disclaimer and the list of authors.
12  * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
13  * conditions, the following disclaimer and the list of authors in the documentation and/or
14  * other materials provided with the distribution.
15  * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
16  * endorse or promote products derived from this software without specific prior written
17  * permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
20  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
24  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 #include <vmm/vmm.h>
30 #include <ubixos/kpanic.h>
31 
32 /************************************************************************
33 
34  Function: void vmm_setPageAttributes(uInt32 pageAddr,int attributes;
35  Description: This Function Will Set The Page Attributes Such As
36  A Read Only Page, Stack Page, COW Page, ETC.
37  Notes:
38 
39  ************************************************************************/
40 int vmm_setPageAttributes(uint32_t memAddr, uint16_t attributes) {
41  uint16_t directoryIndex = 0x0, tableIndex = 0x0;
42  uint32_t *pageTable = 0x0;
43 
44  /* Calculate The Page Directory Index */
45  directoryIndex = (memAddr >> 22);
46 
47  /* Calculate The Page Table Index */
48  tableIndex = ((memAddr >> 12) & 0x3FF);
49 
50  /* Set Table Pointer */
51  if ((pageTable = (uint32_t *) (PT_BASE_ADDR + (0x1000 * directoryIndex))) == 0x0)
52  kpanic("Error: pageTable == NULL, File: %s, Line: %i\n", __FILE__, __LINE__);
53 
54  /* Set Attribute If Page Is Mapped */
55  if (pageTable[tableIndex] != 0x0)
56  pageTable[tableIndex] = ((pageTable[tableIndex] & 0xFFFFF000) | attributes);
57 
58  /* Reload The Page Table; */
59  asm volatile(
60  "push %eax \n"
61  "movl %cr3,%eax\n"
62  "movl %eax,%cr3\n"
63  "pop %eax \n"
64  );
65  /* Return */
66  return (0x0);
67 }
vmm.h
kpanic
void kpanic(const char *fmt,...)
print panic message and halt system
Definition: kpanic.c:41
uint16_t
__uint16_t uint16_t
Definition: types.h:45
kpanic.h
uint32_t
__uint32_t uint32_t
Definition: types.h:46
vmm_setPageAttributes
int vmm_setPageAttributes(uint32_t memAddr, uint16_t attributes)
Definition: setpageattributes.c:39
PT_BASE_ADDR
#define PT_BASE_ADDR
Definition: paging.h:46