1
2
3 /*
4 * Copyright (C) 2013 Jerry Hoemann <jerry.hoemann@hp.com>
5 *
6 * Application to allocate memory at EFI. Syntax of command
7 * mimics the EFI Boot Service "FreePages."
8 *
9 * See UEFI spec 2.3, Section 6.2.
10 *
11
12 Example freeing a 5 page BS_Code setment at address: 0000000020000000 (hex)
13
14
15 FS1:\> memmap
16 Type Start End #pages Attributes
17 BS_Code 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F
18 Available 0000000000001000-000000000008DFFF 000000000000008D 000000000000000F
19 Reserved 000000000008E000-000000000008FFFF 0000000000000002 000000000000000F
20 Available 0000000000090000-000000000009FFFF 0000000000000010 000000000000000F
21 Available 0000000000100000-000000000FFFFFFF 000000000000FF00 000000000000000F
22 BS_Code 0000000010000000-0000000010061FFF 0000000000000062 000000000000000F
23 Available 0000000010062000-000000001FFFFFFF 000000000000FF9E 000000000000000F
24 BS_Code 0000000020000000-0000000020004FFF 0000000000000005 000000000000000F
25 Available 0000000020005000-000000005DDFFFFF 000000000003DDFB 000000000000000F
26 BS_Data 000000005DE00000-000000005DFFFFFF 0000000000000200 000000000000000F
27 Available 000000005E000000-000000006DE7CFFF 000000000000FE7D 000000000000000F
28 ACPI_NVS 000000006DE7D000-000000006EE7CFFF 0000000000001000 000000000000000F
29 BS_Data 000000006EE7D000-00000000709FBFFF 0000000000001B7F 000000000000000F
30 Available 00000000709FC000-00000000710E3FFF 00000000000006E8 000000000000000F
31
32
33 FS1:\> FreePages 0000000020000000 5
34 FreePages: __PhysAddr__ __PgCnt__
35 __PhysAddr__ 0... 3FFFFFFFFFFF
36 __PgCnt__ [0..F000000]
37 All numbers hex w/ no leading 0x
38
39 FreePages(20000000,5)
40
41
42
43 FS1:\> memmap
44 Type Start End #pages Attributes
45 BS_Code 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F
46 Available 0000000000001000-000000000008DFFF 000000000000008D 000000000000000F
47 Reserved 000000000008E000-000000000008FFFF 0000000000000002 000000000000000F
48 Available 0000000000090000-000000000009FFFF 0000000000000010 000000000000000F
49 Available 0000000000100000-000000000FFFFFFF 000000000000FF00 000000000000000F
50 BS_Code 0000000010000000-0000000010061FFF 0000000000000062 000000000000000F
51 Available 0000000010062000-000000005DDFFFFF 000000000004DD9E 000000000000000F
52 BS_Data 000000005DE00000-000000005DFFFFFF 0000000000000200 000000000000000F
53 Available 000000005E000000-000000006DE7CFFF 000000000000FE7D 000000000000000F
54 ACPI_NVS 000000006DE7D000-000000006EE7CFFF 0000000000001000 000000000000000F
55 BS_Data 000000006EE7D000-00000000709FBFFF 0000000000001B7F 000000000000000F
56 Available 00000000709FC000-00000000710E3FFF 00000000000006E8 000000000000000F
57
58
59 */
60
61 #include <efi.h>
62 #include <efilib.h>
63 #include <argify.h>
64
65 /*
66 * FreePages: __PhysAddr__ __PgCnt__
67 *
68 */
69
70 #define MAX_NUM_PAGES 0x000000000F000000
71
72 #define MAX_ADDR ((1ULL << 46) - 1)
73
74 #ifdef DEBUG
75 #undef DEBUG
76 #endif
77 #define DEBUG 0
78
79
80 EFI_STATUS
efi_main(EFI_HANDLE image,EFI_SYSTEM_TABLE * systab)81 efi_main (EFI_HANDLE image, EFI_SYSTEM_TABLE *systab)
82 {
83
84 EFI_STATUS efi_status;
85 EFI_GUID LoadedImageProtocol = LOADED_IMAGE_PROTOCOL;
86 EFI_LOADED_IMAGE *info;
87
88 CHAR16 arglist[MAX_ARGS+1] = {0};
89 CHAR16 *argv[MAX_ARGS];
90 INTN argc = 0;
91 INTN err = 0;
92
93 INTN PgCnt = -1;
94 UINTN PhysAddr = 0;
95
96 InitializeLib(image, systab);
97
98 efi_status = uefi_call_wrapper( BS->HandleProtocol, 3, image,
99 &LoadedImageProtocol, &info);
100
101
102 Print(L"FreePages: __PhysAddr__ __PgCnt__\n");
103 Print(L"__PhysAddr__ 0... %llx\n", MAX_ADDR);
104 Print(L"__PgCnt__ [0..%lx]\n", MAX_NUM_PAGES);
105 Print(L"All numbers hex w/ no leading 0x\n");
106 Print(L"\n");
107
108 #if DEBUG
109 Print(L"%s\n", info->LoadOptions);
110 #endif
111
112
113 #if DEBUG
114 Print(L"Set up arglist\n");
115 #endif
116 CopyMem(arglist, info->LoadOptions, info->LoadOptionsSize);
117 #if DEBUG
118 Print(L"arglist = <%s>\n", arglist);
119 #endif
120
121 #if DEBUG
122 Print(L"Now try argify\n");
123 #endif
124 argc = argify(arglist, info->LoadOptionsSize, argv);
125 #if DEBUG
126 Print(L"argc = %d\n", argc);
127 #endif
128
129 #if DEBUG
130 for (c = 0; c < argc; c++ ) {
131 Print(L"argv[%d] = <%s>\n", c, argv[c]);
132 }
133 #endif
134 if (argc != 3) {
135 Print(L"Invalid argument count\n");
136 return EFI_SUCCESS;
137 }
138
139 PhysAddr = xtoi(argv[1]);
140 PgCnt = xtoi(argv[2]);
141
142 if ( (PgCnt < 0) || (PgCnt > MAX_NUM_PAGES) ) {
143 Print(L"Inavlid PgCnt\n");
144 err++;
145 }
146 if ( PhysAddr > MAX_ADDR ) {
147 Print(L"Inavlid Address\n");
148 err++;
149 }
150 if ( err ) {
151 return EFI_SUCCESS;
152 }
153
154 Print(L"FreePages(%lx,%d)\n", PhysAddr, PgCnt);
155
156 efi_status = uefi_call_wrapper(BS->FreePages, 2, PhysAddr, PgCnt);
157
158 if ( EFI_ERROR(efi_status) ) {
159 Print(L"Free Pages Failed: %d\n", efi_status);
160 return efi_status;
161 }
162
163 return EFI_SUCCESS;
164 }
165