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 <stand.h> 27 #include <efi.h> 28 #include <efichar.h> 29 #include <efilib.h> 30 31 static EFI_GUID FreeBSDBootVarGUID = FREEBSD_BOOT_VAR_GUID; 32 static EFI_GUID GlobalBootVarGUID = EFI_GLOBAL_VARIABLE; 33 34 EFI_STATUS 35 efi_getenv(EFI_GUID *g, const char *v, void *data, size_t *len) 36 { 37 size_t ul; 38 CHAR16 *uv; 39 UINT32 attr; 40 UINTN dl; 41 EFI_STATUS rv; 42 43 uv = NULL; 44 if (utf8_to_ucs2(v, &uv, &ul) != 0) 45 return (EFI_OUT_OF_RESOURCES); 46 dl = *len; 47 rv = RS->GetVariable(uv, g, &attr, &dl, data); 48 if (rv == EFI_SUCCESS || rv == EFI_BUFFER_TOO_SMALL) 49 *len = dl; 50 free(uv); 51 return (rv); 52 } 53 54 EFI_STATUS 55 efi_global_getenv(const char *v, void *data, size_t *len) 56 { 57 58 return (efi_getenv(&GlobalBootVarGUID, v, data, len)); 59 } 60 61 EFI_STATUS 62 efi_freebsd_getenv(const char *v, void *data, size_t *len) 63 { 64 65 return (efi_getenv(&FreeBSDBootVarGUID, v, data, len)); 66 } 67 68 /* 69 * efi_setenv -- Sets an env variable. 70 */ 71 EFI_STATUS 72 efi_setenv(EFI_GUID *guid, const char *varname, UINT32 attr, void *data, __size_t len) 73 { 74 EFI_STATUS rv; 75 CHAR16 *uv; 76 size_t ul; 77 78 uv = NULL; 79 if (utf8_to_ucs2(varname, &uv, &ul) != 0) 80 return (EFI_OUT_OF_RESOURCES); 81 82 rv = RS->SetVariable(uv, guid, attr, len, data); 83 free(uv); 84 return (rv); 85 } 86 87 EFI_STATUS 88 efi_setenv_freebsd_wcs(const char *varname, CHAR16 *valstr) 89 { 90 CHAR16 *var = NULL; 91 size_t len; 92 EFI_STATUS rv; 93 94 if (utf8_to_ucs2(varname, &var, &len) != 0) 95 return (EFI_OUT_OF_RESOURCES); 96 rv = RS->SetVariable(var, &FreeBSDBootVarGUID, 97 EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, 98 (ucs2len(valstr) + 1) * sizeof(efi_char), valstr); 99 free(var); 100 return (rv); 101 } 102 103 /* 104 * efi_delenv -- deletes the specified env variable 105 */ 106 EFI_STATUS 107 efi_delenv(EFI_GUID *guid, const char *name) 108 { 109 CHAR16 *var; 110 size_t len; 111 EFI_STATUS rv; 112 113 var = NULL; 114 if (utf8_to_ucs2(name, &var, &len) != 0) 115 return (EFI_OUT_OF_RESOURCES); 116 117 rv = RS->SetVariable(var, guid, 0, 0, NULL); 118 free(var); 119 return (rv); 120 } 121 122 EFI_STATUS 123 efi_freebsd_delenv(const char *name) 124 { 125 return (efi_delenv(&FreeBSDBootVarGUID, name)); 126 } 127