1 /*- 2 * Copyright (c) 2018 Netflix, Inc. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <stand.h> 30 #include <efi.h> 31 #include <efichar.h> 32 #include <efilib.h> 33 34 static EFI_GUID FreeBSDBootVarGUID = FREEBSD_BOOT_VAR_GUID; 35 static EFI_GUID GlobalBootVarGUID = EFI_GLOBAL_VARIABLE; 36 37 EFI_STATUS 38 efi_getenv(EFI_GUID *g, const char *v, void *data, size_t *len) 39 { 40 size_t ul; 41 CHAR16 *uv; 42 UINT32 attr; 43 UINTN dl; 44 EFI_STATUS rv; 45 46 uv = NULL; 47 if (utf8_to_ucs2(v, &uv, &ul) != 0) 48 return (EFI_OUT_OF_RESOURCES); 49 dl = *len; 50 rv = RS->GetVariable(uv, g, &attr, &dl, data); 51 if (rv == EFI_SUCCESS || rv == EFI_BUFFER_TOO_SMALL) 52 *len = dl; 53 free(uv); 54 return (rv); 55 } 56 57 EFI_STATUS 58 efi_global_getenv(const char *v, void *data, size_t *len) 59 { 60 61 return (efi_getenv(&GlobalBootVarGUID, v, data, len)); 62 } 63 64 EFI_STATUS 65 efi_freebsd_getenv(const char *v, void *data, size_t *len) 66 { 67 68 return (efi_getenv(&FreeBSDBootVarGUID, v, data, len)); 69 } 70 71 /* 72 * efi_setenv -- Sets an env variable. 73 */ 74 EFI_STATUS 75 efi_setenv(EFI_GUID *guid, const char *varname, UINT32 attr, void *data, __size_t len) 76 { 77 EFI_STATUS rv; 78 CHAR16 *uv; 79 size_t ul; 80 81 uv = NULL; 82 if (utf8_to_ucs2(varname, &uv, &ul) != 0) 83 return (EFI_OUT_OF_RESOURCES); 84 85 rv = RS->SetVariable(uv, guid, attr, len, data); 86 free(uv); 87 return (rv); 88 } 89 90 EFI_STATUS 91 efi_setenv_freebsd_wcs(const char *varname, CHAR16 *valstr) 92 { 93 CHAR16 *var = NULL; 94 size_t len; 95 EFI_STATUS rv; 96 97 if (utf8_to_ucs2(varname, &var, &len) != 0) 98 return (EFI_OUT_OF_RESOURCES); 99 rv = RS->SetVariable(var, &FreeBSDBootVarGUID, 100 EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, 101 (ucs2len(valstr) + 1) * sizeof(efi_char), valstr); 102 free(var); 103 return (rv); 104 } 105 106 /* 107 * efi_delenv -- deletes the specified env variable 108 */ 109 EFI_STATUS 110 efi_delenv(EFI_GUID *guid, const char *name) 111 { 112 CHAR16 *var; 113 size_t len; 114 EFI_STATUS rv; 115 116 var = NULL; 117 if (utf8_to_ucs2(name, &var, &len) != 0) 118 return (EFI_OUT_OF_RESOURCES); 119 120 rv = RS->SetVariable(var, guid, 0, 0, NULL); 121 free(var); 122 return rv; 123 } 124