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 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