/* $NetBSD: FreePages.c,v 1.1.1.1 2018/08/16 18:17:47 jmcneill Exp $ */ /* * Copyright (C) 2013 Jerry Hoemann <jerry.hoemann@hp.com> * * Application to allocate memory at EFI. Syntax of command * mimics the EFI Boot Service "FreePages." * * See UEFI spec 2.3, Section 6.2. * Example freeing a 5 page BS_Code setment at address: 0000000020000000 (hex) FS1:\> memmap Type Start End #pages Attributes BS_Code 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F Available 0000000000001000-000000000008DFFF 000000000000008D 000000000000000F Reserved 000000000008E000-000000000008FFFF 0000000000000002 000000000000000F Available 0000000000090000-000000000009FFFF 0000000000000010 000000000000000F Available 0000000000100000-000000000FFFFFFF 000000000000FF00 000000000000000F BS_Code 0000000010000000-0000000010061FFF 0000000000000062 000000000000000F Available 0000000010062000-000000001FFFFFFF 000000000000FF9E 000000000000000F BS_Code 0000000020000000-0000000020004FFF 0000000000000005 000000000000000F Available 0000000020005000-000000005DDFFFFF 000000000003DDFB 000000000000000F BS_Data 000000005DE00000-000000005DFFFFFF 0000000000000200 000000000000000F Available 000000005E000000-000000006DE7CFFF 000000000000FE7D 000000000000000F ACPI_NVS 000000006DE7D000-000000006EE7CFFF 0000000000001000 000000000000000F BS_Data 000000006EE7D000-00000000709FBFFF 0000000000001B7F 000000000000000F Available 00000000709FC000-00000000710E3FFF 00000000000006E8 000000000000000F FS1:\> FreePages 0000000020000000 5 FreePages: __PhysAddr__ __PgCnt__ __PhysAddr__ 0... 3FFFFFFFFFFF __PgCnt__ [0..F000000] All numbers hex w/ no leading 0x FreePages(20000000,5) FS1:\> memmap Type Start End #pages Attributes BS_Code 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F Available 0000000000001000-000000000008DFFF 000000000000008D 000000000000000F Reserved 000000000008E000-000000000008FFFF 0000000000000002 000000000000000F Available 0000000000090000-000000000009FFFF 0000000000000010 000000000000000F Available 0000000000100000-000000000FFFFFFF 000000000000FF00 000000000000000F BS_Code 0000000010000000-0000000010061FFF 0000000000000062 000000000000000F Available 0000000010062000-000000005DDFFFFF 000000000004DD9E 000000000000000F BS_Data 000000005DE00000-000000005DFFFFFF 0000000000000200 000000000000000F Available 000000005E000000-000000006DE7CFFF 000000000000FE7D 000000000000000F ACPI_NVS 000000006DE7D000-000000006EE7CFFF 0000000000001000 000000000000000F BS_Data 000000006EE7D000-00000000709FBFFF 0000000000001B7F 000000000000000F Available 00000000709FC000-00000000710E3FFF 00000000000006E8 000000000000000F */ #include <efi.h> #include <efilib.h> /* * FreePages: __PhysAddr__ __PgCnt__ * */ #define MAX_NUM_PAGES 0x000000000F000000 #define MAX_ADDR ((1ULL << 46) - 1) #ifdef DEBUG #undef DEBUG #endif #define DEBUG 0 EFI_STATUS efi_main (EFI_HANDLE image, EFI_SYSTEM_TABLE *systab) { EFI_STATUS efi_status; CHAR16 **argv; INTN argc = 0; #if DEBUG INTN c = 0; #endif INTN err = 0; INTN PgCnt = -1; EFI_PHYSICAL_ADDRESS PhysAddr = 0; InitializeLib(image, systab); Print(L"FreePages: __PhysAddr__ __PgCnt__\n"); Print(L"__PhysAddr__ 0... %llx\n", MAX_ADDR); Print(L"__PgCnt__ [0..%lx]\n", MAX_NUM_PAGES); Print(L"All numbers hex w/ no leading 0x\n"); Print(L"\n"); #if DEBUG Print(L"Now parse argc/argv\n"); #endif argc = GetShellArgcArgv(image, &argv); #if DEBUG Print(L"argc = %d\n", argc); #endif #if DEBUG for (c = 0; c < argc; c++ ) { Print(L"argv[%d] = <%s>\n", c, argv[c]); } #endif if (argc != 3) { Print(L"Invalid argument count\n"); return EFI_SUCCESS; } PhysAddr = xtoi(argv[1]); PgCnt = xtoi(argv[2]); if ( (PgCnt < 0) || (PgCnt > MAX_NUM_PAGES) ) { Print(L"Inavlid PgCnt\n"); err++; } if ( PhysAddr > MAX_ADDR ) { Print(L"Inavlid Address\n"); err++; } if ( err ) { return EFI_SUCCESS; } Print(L"FreePages(%lx,%d)\n", PhysAddr, PgCnt); efi_status = uefi_call_wrapper(BS->FreePages, 2, PhysAddr, PgCnt); if ( EFI_ERROR(efi_status) ) { Print(L"Free Pages Failed: %d\n", efi_status); return efi_status; } return EFI_SUCCESS; }