1 /* $NetBSD: FreePages.c,v 1.1.1.1 2018/08/16 18:17:47 jmcneill Exp $ */
2
3
4
5 /*
6 * Copyright (C) 2013 Jerry Hoemann <jerry.hoemann@hp.com>
7 *
8 * Application to allocate memory at EFI. Syntax of command
9 * mimics the EFI Boot Service "FreePages."
10 *
11 * See UEFI spec 2.3, Section 6.2.
12 *
13
14 Example freeing a 5 page BS_Code setment at address: 0000000020000000 (hex)
15
16
17 FS1:\> memmap
18 Type Start End #pages Attributes
19 BS_Code 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F
20 Available 0000000000001000-000000000008DFFF 000000000000008D 000000000000000F
21 Reserved 000000000008E000-000000000008FFFF 0000000000000002 000000000000000F
22 Available 0000000000090000-000000000009FFFF 0000000000000010 000000000000000F
23 Available 0000000000100000-000000000FFFFFFF 000000000000FF00 000000000000000F
24 BS_Code 0000000010000000-0000000010061FFF 0000000000000062 000000000000000F
25 Available 0000000010062000-000000001FFFFFFF 000000000000FF9E 000000000000000F
26 BS_Code 0000000020000000-0000000020004FFF 0000000000000005 000000000000000F
27 Available 0000000020005000-000000005DDFFFFF 000000000003DDFB 000000000000000F
28 BS_Data 000000005DE00000-000000005DFFFFFF 0000000000000200 000000000000000F
29 Available 000000005E000000-000000006DE7CFFF 000000000000FE7D 000000000000000F
30 ACPI_NVS 000000006DE7D000-000000006EE7CFFF 0000000000001000 000000000000000F
31 BS_Data 000000006EE7D000-00000000709FBFFF 0000000000001B7F 000000000000000F
32 Available 00000000709FC000-00000000710E3FFF 00000000000006E8 000000000000000F
33
34
35 FS1:\> FreePages 0000000020000000 5
36 FreePages: __PhysAddr__ __PgCnt__
37 __PhysAddr__ 0... 3FFFFFFFFFFF
38 __PgCnt__ [0..F000000]
39 All numbers hex w/ no leading 0x
40
41 FreePages(20000000,5)
42
43
44
45 FS1:\> memmap
46 Type Start End #pages Attributes
47 BS_Code 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F
48 Available 0000000000001000-000000000008DFFF 000000000000008D 000000000000000F
49 Reserved 000000000008E000-000000000008FFFF 0000000000000002 000000000000000F
50 Available 0000000000090000-000000000009FFFF 0000000000000010 000000000000000F
51 Available 0000000000100000-000000000FFFFFFF 000000000000FF00 000000000000000F
52 BS_Code 0000000010000000-0000000010061FFF 0000000000000062 000000000000000F
53 Available 0000000010062000-000000005DDFFFFF 000000000004DD9E 000000000000000F
54 BS_Data 000000005DE00000-000000005DFFFFFF 0000000000000200 000000000000000F
55 Available 000000005E000000-000000006DE7CFFF 000000000000FE7D 000000000000000F
56 ACPI_NVS 000000006DE7D000-000000006EE7CFFF 0000000000001000 000000000000000F
57 BS_Data 000000006EE7D000-00000000709FBFFF 0000000000001B7F 000000000000000F
58 Available 00000000709FC000-00000000710E3FFF 00000000000006E8 000000000000000F
59
60
61 */
62
63 #include <efi.h>
64 #include <efilib.h>
65
66 /*
67 * FreePages: __PhysAddr__ __PgCnt__
68 *
69 */
70
71 #define MAX_NUM_PAGES 0x000000000F000000
72
73 #define MAX_ADDR ((1ULL << 46) - 1)
74
75 #ifdef DEBUG
76 #undef DEBUG
77 #endif
78 #define DEBUG 0
79
80
81 EFI_STATUS
efi_main(EFI_HANDLE image,EFI_SYSTEM_TABLE * systab)82 efi_main (EFI_HANDLE image, EFI_SYSTEM_TABLE *systab)
83 {
84
85 EFI_STATUS efi_status;
86 CHAR16 **argv;
87 INTN argc = 0;
88 #if DEBUG
89 INTN c = 0;
90 #endif
91 INTN err = 0;
92
93 INTN PgCnt = -1;
94 EFI_PHYSICAL_ADDRESS PhysAddr = 0;
95
96 InitializeLib(image, systab);
97
98 Print(L"FreePages: __PhysAddr__ __PgCnt__\n");
99 Print(L"__PhysAddr__ 0... %llx\n", MAX_ADDR);
100 Print(L"__PgCnt__ [0..%lx]\n", MAX_NUM_PAGES);
101 Print(L"All numbers hex w/ no leading 0x\n");
102 Print(L"\n");
103
104 #if DEBUG
105 Print(L"Now parse argc/argv\n");
106 #endif
107 argc = GetShellArgcArgv(image, &argv);
108 #if DEBUG
109 Print(L"argc = %d\n", argc);
110 #endif
111
112 #if DEBUG
113 for (c = 0; c < argc; c++ ) {
114 Print(L"argv[%d] = <%s>\n", c, argv[c]);
115 }
116 #endif
117 if (argc != 3) {
118 Print(L"Invalid argument count\n");
119 return EFI_SUCCESS;
120 }
121
122 PhysAddr = xtoi(argv[1]);
123 PgCnt = xtoi(argv[2]);
124
125 if ( (PgCnt < 0) || (PgCnt > MAX_NUM_PAGES) ) {
126 Print(L"Inavlid PgCnt\n");
127 err++;
128 }
129 if ( PhysAddr > MAX_ADDR ) {
130 Print(L"Inavlid Address\n");
131 err++;
132 }
133 if ( err ) {
134 return EFI_SUCCESS;
135 }
136
137 Print(L"FreePages(%lx,%d)\n", PhysAddr, PgCnt);
138
139 efi_status = uefi_call_wrapper(BS->FreePages, 2, PhysAddr, PgCnt);
140
141 if ( EFI_ERROR(efi_status) ) {
142 Print(L"Free Pages Failed: %d\n", efi_status);
143 return efi_status;
144 }
145
146 return EFI_SUCCESS;
147 }
148