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Diffstat (limited to 'gnu-efi/apps/FreePages.c')
| -rw-r--r-- | gnu-efi/apps/FreePages.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/gnu-efi/apps/FreePages.c b/gnu-efi/apps/FreePages.c new file mode 100644 index 00000000..247c75dc --- /dev/null +++ b/gnu-efi/apps/FreePages.c @@ -0,0 +1,145 @@ + + +/* + * 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; +} |