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 #include <stand.h> 28 #include <efi.h> 29 #include <efichar.h> 30 #include <efilib.h> 31 32 static EFI_GUID FreeBSDBootVarGUID = FREEBSD_BOOT_VAR_GUID; 33 static EFI_GUID GlobalBootVarGUID = EFI_GLOBAL_VARIABLE; 34 35 EFI_STATUS 36 efi_getenv(EFI_GUID *g, const char *v, void *data, size_t *len) 37 { 38 size_t ul; 39 CHAR16 *uv; 40 UINT32 attr; 41 UINTN dl; 42 EFI_STATUS rv; 43 44 uv = NULL; 45 if (utf8_to_ucs2(v, &uv, &ul) != 0) 46 return (EFI_OUT_OF_RESOURCES); 47 dl = *len; 48 rv = RS->GetVariable(uv, g, &attr, &dl, data); 49 if (rv == EFI_SUCCESS || rv == EFI_BUFFER_TOO_SMALL) 50 *len = dl; 51 free(uv); 52 return (rv); 53 } 54 55 EFI_STATUS 56 efi_global_getenv(const char *v, void *data, size_t *len) 57 { 58 59 return (efi_getenv(&GlobalBootVarGUID, v, data, len)); 60 } 61 62 EFI_STATUS 63 efi_freebsd_getenv(const char *v, void *data, size_t *len) 64 { 65 66 return (efi_getenv(&FreeBSDBootVarGUID, v, data, len)); 67 } 68 69 /* 70 * efi_setenv -- Sets an env variable. 71 */ 72 EFI_STATUS 73 efi_setenv(EFI_GUID *guid, const char *varname, UINT32 attr, void *data, __size_t len) 74 { 75 EFI_STATUS rv; 76 CHAR16 *uv; 77 size_t ul; 78 79 uv = NULL; 80 if (utf8_to_ucs2(varname, &uv, &ul) != 0) 81 return (EFI_OUT_OF_RESOURCES); 82 83 rv = RS->SetVariable(uv, guid, attr, len, data); 84 free(uv); 85 return (rv); 86 } 87 88 EFI_STATUS 89 efi_setenv_freebsd_wcs(const char *varname, CHAR16 *valstr) 90 { 91 CHAR16 *var = NULL; 92 size_t len; 93 EFI_STATUS rv; 94 95 if (utf8_to_ucs2(varname, &var, &len) != 0) 96 return (EFI_OUT_OF_RESOURCES); 97 rv = RS->SetVariable(var, &FreeBSDBootVarGUID, 98 EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, 99 (ucs2len(valstr) + 1) * sizeof(efi_char), valstr); 100 free(var); 101 return (rv); 102 } 103 104 /* 105 * efi_delenv -- deletes the specified env variable 106 */ 107 EFI_STATUS 108 efi_delenv(EFI_GUID *guid, const char *name) 109 { 110 CHAR16 *var; 111 size_t len; 112 EFI_STATUS rv; 113 114 var = NULL; 115 if (utf8_to_ucs2(name, &var, &len) != 0) 116 return (EFI_OUT_OF_RESOURCES); 117 118 rv = RS->SetVariable(var, guid, 0, 0, NULL); 119 free(var); 120 return (rv); 121 } 122 123 EFI_STATUS 124 efi_freebsd_delenv(const char *name) 125 { 126 return (efi_delenv(&FreeBSDBootVarGUID, name)); 127 } 128