UbixOS V2 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