1 1.1 jmcneill /* $NetBSD: FreePages.c,v 1.1.1.1 2018/08/16 18:17:47 jmcneill Exp $ */ 2 1.1 jmcneill 3 1.1 jmcneill 4 1.1 jmcneill 5 1.1 jmcneill /* 6 1.1 jmcneill * Copyright (C) 2013 Jerry Hoemann <jerry.hoemann (at) hp.com> 7 1.1 jmcneill * 8 1.1 jmcneill * Application to allocate memory at EFI. Syntax of command 9 1.1 jmcneill * mimics the EFI Boot Service "FreePages." 10 1.1 jmcneill * 11 1.1 jmcneill * See UEFI spec 2.3, Section 6.2. 12 1.1 jmcneill * 13 1.1 jmcneill 14 1.1 jmcneill Example freeing a 5 page BS_Code setment at address: 0000000020000000 (hex) 15 1.1 jmcneill 16 1.1 jmcneill 17 1.1 jmcneill FS1:\> memmap 18 1.1 jmcneill Type Start End #pages Attributes 19 1.1 jmcneill BS_Code 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F 20 1.1 jmcneill Available 0000000000001000-000000000008DFFF 000000000000008D 000000000000000F 21 1.1 jmcneill Reserved 000000000008E000-000000000008FFFF 0000000000000002 000000000000000F 22 1.1 jmcneill Available 0000000000090000-000000000009FFFF 0000000000000010 000000000000000F 23 1.1 jmcneill Available 0000000000100000-000000000FFFFFFF 000000000000FF00 000000000000000F 24 1.1 jmcneill BS_Code 0000000010000000-0000000010061FFF 0000000000000062 000000000000000F 25 1.1 jmcneill Available 0000000010062000-000000001FFFFFFF 000000000000FF9E 000000000000000F 26 1.1 jmcneill BS_Code 0000000020000000-0000000020004FFF 0000000000000005 000000000000000F 27 1.1 jmcneill Available 0000000020005000-000000005DDFFFFF 000000000003DDFB 000000000000000F 28 1.1 jmcneill BS_Data 000000005DE00000-000000005DFFFFFF 0000000000000200 000000000000000F 29 1.1 jmcneill Available 000000005E000000-000000006DE7CFFF 000000000000FE7D 000000000000000F 30 1.1 jmcneill ACPI_NVS 000000006DE7D000-000000006EE7CFFF 0000000000001000 000000000000000F 31 1.1 jmcneill BS_Data 000000006EE7D000-00000000709FBFFF 0000000000001B7F 000000000000000F 32 1.1 jmcneill Available 00000000709FC000-00000000710E3FFF 00000000000006E8 000000000000000F 33 1.1 jmcneill 34 1.1 jmcneill 35 1.1 jmcneill FS1:\> FreePages 0000000020000000 5 36 1.1 jmcneill FreePages: __PhysAddr__ __PgCnt__ 37 1.1 jmcneill __PhysAddr__ 0... 3FFFFFFFFFFF 38 1.1 jmcneill __PgCnt__ [0..F000000] 39 1.1 jmcneill All numbers hex w/ no leading 0x 40 1.1 jmcneill 41 1.1 jmcneill FreePages(20000000,5) 42 1.1 jmcneill 43 1.1 jmcneill 44 1.1 jmcneill 45 1.1 jmcneill FS1:\> memmap 46 1.1 jmcneill Type Start End #pages Attributes 47 1.1 jmcneill BS_Code 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F 48 1.1 jmcneill Available 0000000000001000-000000000008DFFF 000000000000008D 000000000000000F 49 1.1 jmcneill Reserved 000000000008E000-000000000008FFFF 0000000000000002 000000000000000F 50 1.1 jmcneill Available 0000000000090000-000000000009FFFF 0000000000000010 000000000000000F 51 1.1 jmcneill Available 0000000000100000-000000000FFFFFFF 000000000000FF00 000000000000000F 52 1.1 jmcneill BS_Code 0000000010000000-0000000010061FFF 0000000000000062 000000000000000F 53 1.1 jmcneill Available 0000000010062000-000000005DDFFFFF 000000000004DD9E 000000000000000F 54 1.1 jmcneill BS_Data 000000005DE00000-000000005DFFFFFF 0000000000000200 000000000000000F 55 1.1 jmcneill Available 000000005E000000-000000006DE7CFFF 000000000000FE7D 000000000000000F 56 1.1 jmcneill ACPI_NVS 000000006DE7D000-000000006EE7CFFF 0000000000001000 000000000000000F 57 1.1 jmcneill BS_Data 000000006EE7D000-00000000709FBFFF 0000000000001B7F 000000000000000F 58 1.1 jmcneill Available 00000000709FC000-00000000710E3FFF 00000000000006E8 000000000000000F 59 1.1 jmcneill 60 1.1 jmcneill 61 1.1 jmcneill */ 62 1.1 jmcneill 63 1.1 jmcneill #include <efi.h> 64 1.1 jmcneill #include <efilib.h> 65 1.1 jmcneill 66 1.1 jmcneill /* 67 1.1 jmcneill * FreePages: __PhysAddr__ __PgCnt__ 68 1.1 jmcneill * 69 1.1 jmcneill */ 70 1.1 jmcneill 71 1.1 jmcneill #define MAX_NUM_PAGES 0x000000000F000000 72 1.1 jmcneill 73 1.1 jmcneill #define MAX_ADDR ((1ULL << 46) - 1) 74 1.1 jmcneill 75 1.1 jmcneill #ifdef DEBUG 76 1.1 jmcneill #undef DEBUG 77 1.1 jmcneill #endif 78 1.1 jmcneill #define DEBUG 0 79 1.1 jmcneill 80 1.1 jmcneill 81 1.1 jmcneill EFI_STATUS 82 1.1 jmcneill efi_main (EFI_HANDLE image, EFI_SYSTEM_TABLE *systab) 83 1.1 jmcneill { 84 1.1 jmcneill 85 1.1 jmcneill EFI_STATUS efi_status; 86 1.1 jmcneill CHAR16 **argv; 87 1.1 jmcneill INTN argc = 0; 88 1.1 jmcneill #if DEBUG 89 1.1 jmcneill INTN c = 0; 90 1.1 jmcneill #endif 91 1.1 jmcneill INTN err = 0; 92 1.1 jmcneill 93 1.1 jmcneill INTN PgCnt = -1; 94 1.1 jmcneill EFI_PHYSICAL_ADDRESS PhysAddr = 0; 95 1.1 jmcneill 96 1.1 jmcneill InitializeLib(image, systab); 97 1.1 jmcneill 98 1.1 jmcneill Print(L"FreePages: __PhysAddr__ __PgCnt__\n"); 99 1.1 jmcneill Print(L"__PhysAddr__ 0... %llx\n", MAX_ADDR); 100 1.1 jmcneill Print(L"__PgCnt__ [0..%lx]\n", MAX_NUM_PAGES); 101 1.1 jmcneill Print(L"All numbers hex w/ no leading 0x\n"); 102 1.1 jmcneill Print(L"\n"); 103 1.1 jmcneill 104 1.1 jmcneill #if DEBUG 105 1.1 jmcneill Print(L"Now parse argc/argv\n"); 106 1.1 jmcneill #endif 107 1.1 jmcneill argc = GetShellArgcArgv(image, &argv); 108 1.1 jmcneill #if DEBUG 109 1.1 jmcneill Print(L"argc = %d\n", argc); 110 1.1 jmcneill #endif 111 1.1 jmcneill 112 1.1 jmcneill #if DEBUG 113 1.1 jmcneill for (c = 0; c < argc; c++ ) { 114 1.1 jmcneill Print(L"argv[%d] = <%s>\n", c, argv[c]); 115 1.1 jmcneill } 116 1.1 jmcneill #endif 117 1.1 jmcneill if (argc != 3) { 118 1.1 jmcneill Print(L"Invalid argument count\n"); 119 1.1 jmcneill return EFI_SUCCESS; 120 1.1 jmcneill } 121 1.1 jmcneill 122 1.1 jmcneill PhysAddr = xtoi(argv[1]); 123 1.1 jmcneill PgCnt = xtoi(argv[2]); 124 1.1 jmcneill 125 1.1 jmcneill if ( (PgCnt < 0) || (PgCnt > MAX_NUM_PAGES) ) { 126 1.1 jmcneill Print(L"Inavlid PgCnt\n"); 127 1.1 jmcneill err++; 128 1.1 jmcneill } 129 1.1 jmcneill if ( PhysAddr > MAX_ADDR ) { 130 1.1 jmcneill Print(L"Inavlid Address\n"); 131 1.1 jmcneill err++; 132 1.1 jmcneill } 133 1.1 jmcneill if ( err ) { 134 1.1 jmcneill return EFI_SUCCESS; 135 1.1 jmcneill } 136 1.1 jmcneill 137 1.1 jmcneill Print(L"FreePages(%lx,%d)\n", PhysAddr, PgCnt); 138 1.1 jmcneill 139 1.1 jmcneill efi_status = uefi_call_wrapper(BS->FreePages, 2, PhysAddr, PgCnt); 140 1.1 jmcneill 141 1.1 jmcneill if ( EFI_ERROR(efi_status) ) { 142 1.1 jmcneill Print(L"Free Pages Failed: %d\n", efi_status); 143 1.1 jmcneill return efi_status; 144 1.1 jmcneill } 145 1.1 jmcneill 146 1.1 jmcneill return EFI_SUCCESS; 147 1.1 jmcneill } 148
Indexes created Sun Sep 21 20:09:37 GMT 2025