[freeldr] Move custom.c, drivemap.c/h, miscboot.c/h to i386 directories
[reactos.git] / reactos / boot / freeldr / freeldr / arch / i386 / xboxmem.c
1 /* $Id$
2 *
3 * FreeLoader
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Note: much of this code was based on knowledge and/or code developed
20 * by the Xbox Linux group: http://www.xbox-linux.org
21 */
22
23 #include <freeldr.h>
24
25 static ULONG InstalledMemoryMb = 0;
26 static ULONG AvailableMemoryMb = 0;
27
28 #define TEST_SIZE 0x200
29 #define TEST_PATTERN1 0xaa
30 #define TEST_PATTERN2 0x55
31
32 VOID
33 XboxMemInit(VOID)
34 {
35 UCHAR ControlRegion[TEST_SIZE];
36 PVOID MembaseTop = (PVOID)(64 * 1024 * 1024);
37 PVOID MembaseLow = (PVOID)0;
38
39 (*(PULONG)(0xfd000000 + 0x100200)) = 0x03070103 ;
40 (*(PULONG)(0xfd000000 + 0x100204)) = 0x11448000 ;
41
42 WRITE_PORT_ULONG((ULONG*) 0xcf8, CONFIG_CMD(0, 0, 0x84));
43 WRITE_PORT_ULONG((ULONG*) 0xcfc, 0x7ffffff); /* Prep hardware for 128 Mb */
44
45 InstalledMemoryMb = 64;
46 memset(ControlRegion, TEST_PATTERN1, TEST_SIZE);
47 memset(MembaseTop, TEST_PATTERN1, TEST_SIZE);
48 __wbinvd();
49
50 if (0 == memcmp(MembaseTop, ControlRegion, TEST_SIZE))
51 {
52 /* Looks like there is memory .. maybe a 128MB box */
53 memset(ControlRegion, TEST_PATTERN2, TEST_SIZE);
54 memset(MembaseTop, TEST_PATTERN2, TEST_SIZE);
55 __wbinvd();
56 if (0 == memcmp(MembaseTop, ControlRegion, TEST_SIZE))
57 {
58 /* Definitely looks like there is memory */
59 if (0 == memcmp(MembaseLow, ControlRegion, TEST_SIZE))
60 {
61 /* Hell, we find the Test-string at 0x0 too ! */
62 InstalledMemoryMb = 64;
63 }
64 else
65 {
66 InstalledMemoryMb = 128;
67 }
68 }
69 }
70
71 /* Set hardware for amount of memory detected */
72 WRITE_PORT_ULONG((ULONG*) 0xcf8, CONFIG_CMD(0, 0, 0x84));
73 WRITE_PORT_ULONG((ULONG*) 0xcfc, InstalledMemoryMb * 1024 * 1024 - 1);
74
75 AvailableMemoryMb = InstalledMemoryMb;
76 }
77
78 ULONG
79 XboxMemGetMemoryMap(PBIOS_MEMORY_MAP BiosMemoryMap, ULONG MaxMemoryMapSize)
80 {
81 ULONG EntryCount = 0;
82
83 /* Synthesize memory map */
84 if (1 <= MaxMemoryMapSize)
85 {
86 /* Available RAM block */
87 BiosMemoryMap[0].BaseAddress = 0;
88 BiosMemoryMap[0].Length = AvailableMemoryMb * 1024 * 1024;
89 BiosMemoryMap[0].Type = BiosMemoryUsable;
90 EntryCount = 1;
91 }
92
93 if (2 <= MaxMemoryMapSize)
94 {
95 /* Video memory */
96 BiosMemoryMap[1].BaseAddress = AvailableMemoryMb * 1024 * 1024;
97 BiosMemoryMap[1].Length = (InstalledMemoryMb - AvailableMemoryMb) * 1024 * 1024;
98 BiosMemoryMap[1].Type = BiosMemoryReserved;
99 EntryCount = 2;
100 }
101
102 return EntryCount;
103 }
104
105 PVOID
106 XboxMemReserveMemory(ULONG MbToReserve)
107 {
108 if (0 == InstalledMemoryMb)
109 {
110 /* Hmm, seems we're not initialized yet */
111 XboxMemInit();
112 }
113
114 if (AvailableMemoryMb < MbToReserve)
115 {
116 /* Can't satisfy the request */
117 return NULL;
118 }
119
120 AvailableMemoryMb -= MbToReserve;
121
122 /* Top of available memory points to the space just reserved */
123 return (PVOID) (AvailableMemoryMb * 1024 * 1024);
124 }
125
126 /* EOF */