1 2 3 /* 4 * Copyright (C) 2013 Jerry Hoemann <jerry.hoemann (at) 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 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
