2 efivars_proc.[ch] - Manipulates EFI variables as exported in /proc/efi/vars
4 Copyright (C) 2001,2003 Dell Computer Corporation <Matt_Domsch@dell.com>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #define _FILE_OFFSET_BITS 64
33 #include <sys/socket.h>
34 #include <sys/types.h>
35 #include <sys/ioctl.h>
36 #include <linux/sockios.h>
39 typedef unsigned long long u64; /* hack, so we may include kernel's ethtool.h */
40 typedef __uint32_t u32; /* ditto */
41 typedef __uint16_t u16; /* ditto */
42 typedef __uint8_t u8; /* ditto */
44 #include <linux/ethtool.h>
47 #include "scsi_ioctls.h"
49 #include "efibootmgr.h"
50 #include "efivars_procfs.h"
51 #include "efivars_sysfs.h"
53 static struct efivar_kernel_calls *fs_kernel_calls;
56 load_option_path(EFI_LOAD_OPTION *option)
58 char *p = (char *) option;
59 return (EFI_DEVICE_PATH *)
60 (p + sizeof(uint32_t) /* Attributes */
61 + sizeof(uint16_t) /* FilePathListLength*/
62 + efichar_strsize(option->description)); /* Description */
66 efi_guid_unparse(efi_guid_t *guid, char *out)
68 sprintf(out, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
69 guid->b[3], guid->b[2], guid->b[1], guid->b[0],
70 guid->b[5], guid->b[4], guid->b[7], guid->b[6],
71 guid->b[8], guid->b[9], guid->b[10], guid->b[11],
72 guid->b[12], guid->b[13], guid->b[14], guid->b[15]);
81 snprintf(name, PATH_MAX, "%s", SYSFS_DIR_EFI_VARS);
85 fs_kernel_calls = &sysfs_kernel_calls;
89 snprintf(name, PATH_MAX, "%s", PROCFS_DIR_EFI_VARS);
93 fs_kernel_calls = &procfs_kernel_calls;
96 fprintf(stderr, "Fatal: Couldn't open either sysfs or procfs directories for accessing EFI variables.\n");
97 fprintf(stderr, "Try 'modprobe efivars' as root.\n");
104 write_variable_to_file(efi_variable_t *var)
106 int fd, byteswritten;
107 if (!var || !opts.testfile) return EFI_INVALID_PARAMETER;
109 printf("Test mode: Writing to %s\n", opts.testfile);
110 fd = creat(opts.testfile, S_IRWXU);
112 perror("Couldn't write to testfile");
113 return EFI_INVALID_PARAMETER;
116 byteswritten = write(fd, var, sizeof(*var));
117 if (byteswritten == -1) {
118 perror("Writing to testfile");
126 read_variable(const char *name, efi_variable_t *var)
128 if (!name || !var) return EFI_INVALID_PARAMETER;
129 return fs_kernel_calls->read(name, var);
133 create_variable(efi_variable_t *var)
135 if (!var) return EFI_INVALID_PARAMETER;
136 if (opts.testfile) return write_variable_to_file(var);
137 return fs_kernel_calls->create(var);
141 delete_variable(efi_variable_t *var)
143 if (!var) return EFI_INVALID_PARAMETER;
144 if (opts.testfile) return write_variable_to_file(var);
145 return fs_kernel_calls->delete(var);
150 edit_variable(efi_variable_t *var)
153 if (!var) return EFI_INVALID_PARAMETER;
154 if (opts.testfile) return write_variable_to_file(var);
156 variable_to_name(var, name);
157 return fs_kernel_calls->edit(name, var);
161 create_or_edit_variable(efi_variable_t *var)
163 efi_variable_t testvar;
166 memcpy(&testvar, var, sizeof(*var));
167 variable_to_name(var, name);
169 if (read_variable(name, &testvar) == EFI_SUCCESS)
170 return edit_variable(var);
172 return create_variable(var);
176 select_boot_var_names(const struct dirent *d)
179 rc = sscanf(d->d_name, "Boot0%03x-%*s", &num);
184 read_boot_var_names(struct dirent ***namelist)
186 if (!fs_kernel_calls || !namelist) return -1;
187 return scandir(fs_kernel_calls->path,
188 namelist, select_boot_var_names,
198 efi_guid_t guid = BLKX_UNKNOWN_GUID;
199 char name[80], text_guid[40];
200 ACPI_DEVICE_PATH *path = (ACPI_DEVICE_PATH *)&(var.Data);
203 /* Allow global user option override */
205 switch (opts.edd_version)
207 case 0: /* No EDD information */
210 case 1: /* EDD 1.0 */
213 case 3: /* EDD 3.0 */
221 memset(&var, 0, sizeof(efi_variable_t));
222 efi_guid_unparse(&guid, text_guid);
223 sprintf(name, "blk0-%s", text_guid);
225 status = read_variable(name, &var);
226 if (status != EFI_SUCCESS) {
229 if (path->type == 2 && path->subtype == 1) rc = 3;
235 EFI_DEVICE_PATH, 0x01 (Hardware), 0x04 (Vendor), length 0x0018
236 This needs to know what EFI device has the boot device.
239 make_edd10_device_path(void *dest, uint32_t hardware_device)
241 VENDOR_DEVICE_PATH *hw;
242 char buffer[EDD10_HARDWARE_VENDOR_PATH_LENGTH];
243 efi_guid_t guid = EDD10_HARDWARE_VENDOR_PATH_GUID;
245 memset(buffer, 0, sizeof(buffer));
246 hw = (VENDOR_DEVICE_PATH *)buffer;
247 data = (uint32_t *)hw->data;
248 hw->type = 0x01; /* Hardware Device Path */
249 hw->subtype = 0x04; /* Vendor */
250 hw->length = EDD10_HARDWARE_VENDOR_PATH_LENGTH;
251 memcpy(&(hw->vendor_guid), &guid, sizeof(guid));
252 *data = hardware_device;
253 memcpy(dest, buffer, hw->length);
258 make_end_device_path(void *dest)
261 memset(&p, 0, sizeof(p));
262 p.type = 0x7F; /* End of Hardware Device Path */
263 p.subtype = 0xFF; /* End Entire Device Path */
264 p.length = sizeof(p);
265 memcpy(dest, &p, p.length);
270 make_acpi_device_path(void *dest, uint32_t _HID, uint32_t _UID)
273 memset(&p, 0, sizeof(p));
276 p.length = sizeof(p);
279 memcpy(dest, &p, p.length);
284 make_mac_addr_device_path(void *dest, char *mac, uint8_t iftype)
288 MAC_ADDR_DEVICE_PATH p;
289 memset(&p, 0, sizeof(p));
292 p.length = sizeof(p);
293 for (i=0; i < 14; i++) {
294 p.macaddr[i] = mac[i];
297 memcpy(dest, &p, p.length);
302 make_pci_device_path(void *dest, uint8_t device, uint8_t function)
305 memset(&p, 0, sizeof(p));
308 p.length = sizeof(p);
310 p.function = function;
311 memcpy(dest, &p, p.length);
316 make_scsi_device_path(void *dest, uint16_t id, uint16_t lun)
319 memset(&p, 0, sizeof(p));
322 p.length = sizeof(p);
325 memcpy(dest, &p, p.length);
330 make_harddrive_device_path(void *dest, uint32_t num, uint64_t start, uint64_t size,
332 uint8_t mbr_type, uint8_t signature_type)
334 HARDDRIVE_DEVICE_PATH p;
335 memset(&p, 0, sizeof(p));
338 p.length = sizeof(p);
342 if (signature) memcpy(p.signature, signature, 16);
343 p.mbr_type = mbr_type;
344 p.signature_type = signature_type;
345 memcpy(dest, &p, p.length);
350 make_file_path_device_path(void *dest, efi_char16_t *name)
352 FILE_PATH_DEVICE_PATH *p;
354 int namelen = efichar_strlen(name, -1);
355 int namesize = efichar_strsize(name);
357 memset(buffer, 0, sizeof(buffer));
358 p = (FILE_PATH_DEVICE_PATH *)buffer;
361 p->length = 4 + namesize;
362 efichar_strncpy(p->path_name,
365 memcpy(dest, buffer, p->length);
373 make_edd30_device_path(int fd, void *buffer)
376 unsigned char bus=0, device=0, function=0;
378 unsigned char host=0, channel=0, id=0, lun=0;
382 rc = disk_get_pci(fd, &bus, &device, &function);
385 memset(&idlun, 0, sizeof(idlun));
386 rc = get_scsi_idlun(fd, &idlun);
388 idlun_to_components(&idlun, &host, &channel, &id, &lun);
390 p += make_acpi_device_path (p, EISAID_PNP0A03, bus);
391 p += make_pci_device_path (p, device, function);
392 p += make_scsi_device_path (p, id, lun);
393 return ((void *)p - buffer);
397 * make_disk_load_option()
400 * Returns 0 on error, length of load option created on success.
402 char *make_disk_load_option(char *p, char *disk)
407 int rc, edd_version=0;
408 uint8_t mbr_type=0, signature_type=0;
409 uint64_t start=0, size=0;
410 efi_char16_t os_loader_path[40];
412 memset(signature, 0, sizeof(signature));
414 disk_fd = open(opts.disk, O_RDWR);
416 sprintf(buffer, "Could not open disk %s", opts.disk);
421 if (opts.edd_version) {
422 edd_version = get_edd_version();
424 if (edd_version == 3) {
425 p += make_edd30_device_path(disk_fd, p);
427 else if (edd_version == 1) {
428 p += make_edd10_device_path(p, opts.edd10_devicenum);
432 rc = disk_get_partition_info (disk_fd, opts.part,
433 &start, &size, signature,
434 &mbr_type, &signature_type);
439 fprintf(stderr, "Error: no partition information on disk %s.\n"
440 " Cowardly refusing to create a boot option.\n",
445 p += make_harddrive_device_path (p, opts.part,
448 mbr_type, signature_type);
450 efichar_from_char(os_loader_path, opts.loader, sizeof(os_loader_path));
451 p += make_file_path_device_path (p, os_loader_path);
452 p += make_end_device_path (p);
458 * make_net_load_option()
459 * @data - load option returned
461 * Returns 0 on error, length of load option created on success.
463 char *make_net_load_option(char *p, char *iface)
465 /* copied pretty much verbatim from the ethtool source */
469 struct ethtool_drvinfo drvinfo;
471 memset(&ifr, 0, sizeof(ifr));
472 strcpy(ifr.ifr_name, iface);
473 drvinfo.cmd = ETHTOOL_GDRVINFO;
474 ifr.ifr_data = (caddr_t)&drvinfo;
475 /* Open control socket */
476 fd = socket(AF_INET, SOCK_DGRAM, 0);
478 perror("Cannot get control socket");
480 err = ioctl(fd, SIOCETHTOOL, &ifr);
482 perror("Cannot get driver information");
485 err = sscanf(drvinfo.bus_info, "%2x:%2x.%x", &bus, &slot, &func);
487 perror("Couldn't parse device location string.");
490 p += make_acpi_device_path(p, opts.acpi_hid, opts.acpi_uid);
491 p += make_pci_device_path(p, (uint8_t)slot, (uint8_t)func);
493 err = ioctl(fd, SIOCGIFHWADDR, &ifr);
495 perror("Cannot get hardware address.");
498 p += make_mac_addr_device_path(p, ifr.ifr_ifru.ifru_hwaddr.sa_data, 0);
499 p += make_end_device_path (p);
505 * make_linux_load_option()
506 * @data - load option returned
508 * Returns 0 on error, length of load option created on success.
511 make_linux_load_option(void *data)
513 EFI_LOAD_OPTION *load_option = data;
515 efi_char16_t description[64];
516 unsigned long datasize=0;
518 /* Write Attributes */
519 if (opts.active) load_option->attributes = LOAD_OPTION_ACTIVE;
520 else load_option->attributes = 0;
522 p += sizeof(uint32_t);
523 /* skip writing file_path_list_length */
524 p += sizeof(uint16_t);
525 /* Write description. This is the text that appears on the screen for the load option. */
526 memset(description, 0, sizeof(description));
527 efichar_from_char(description, opts.label, sizeof(description));
528 efichar_strncpy(load_option->description, description, sizeof(description));
529 p += efichar_strsize(load_option->description);
534 p = (char *)make_net_load_option(p, opts.iface);
538 p = (char *)make_disk_load_option(p, opts.iface);
541 load_option->file_path_list_length = p - q;
543 datasize = (uint8_t *)p - (uint8_t *)data;
548 * append_extra_args()
549 * appends all arguments from argv[] not snarfed by getopt
550 * as one long string onto data, up to maxchars. allow for nulls
554 append_extra_args_ascii(void *data, unsigned long maxchars)
558 unsigned long usedchars=0;
562 for (i=opts.optind; i < opts.argc && usedchars < maxchars; i++) {
563 p = strncpy(p, opts.argv[i], maxchars-usedchars-1);
567 usedchars = p - (char *)data;
569 /* Put a space between args */
570 if (i < (opts.argc-1)) {
572 p = strncpy(p, " ", maxchars-usedchars-1);
574 usedchars = p - (char *)data;
578 /* Remember the NULL */
579 if (appended) return strlen(data) + 1;
584 append_extra_args_unicode(void *data, unsigned long maxchars)
588 unsigned long usedchars=0;
592 for (i=opts.optind; i < opts.argc && usedchars < maxchars; i++) {
593 p += efichar_from_char((efi_char16_t *)p, opts.argv[i],
595 usedchars = efichar_strsize(data) - sizeof(efi_char16_t);
598 /* Put a space between args */
599 if (i < (opts.argc-1)) {
600 p += efichar_from_char((efi_char16_t *)p, " ",
602 usedchars = efichar_strsize(data) -
603 sizeof(efi_char16_t);
607 if (appended) return efichar_strsize( (efi_char16_t *)data );
613 append_extra_args(void *data, unsigned long maxchars)
616 return append_extra_args_unicode(data, maxchars);
618 return append_extra_args_ascii(data, maxchars);
624 make_linux_efi_variable(efi_variable_t *var,
625 unsigned int free_number)
627 efi_guid_t guid = EFI_GLOBAL_VARIABLE;
629 unsigned char *optional_data=NULL;
630 unsigned long load_option_size = 0, opt_data_size=0;
632 memset(buffer, 0, sizeof(buffer));
634 /* VariableName needs to be BootXXXX */
635 sprintf(buffer, "Boot%04x", free_number);
637 efichar_from_char(var->VariableName, buffer, 1024);
639 memcpy(&(var->VendorGuid), &guid, sizeof(guid));
641 EFI_VARIABLE_NON_VOLATILE |
642 EFI_VARIABLE_BOOTSERVICE_ACCESS |
643 EFI_VARIABLE_RUNTIME_ACCESS;
645 /* Set Data[] and DataSize */
647 load_option_size = make_linux_load_option(var->Data);
649 if (!load_option_size) return 0;
651 /* Set OptionalData (passed as binary to the called app) */
652 optional_data = var->Data + load_option_size;
653 opt_data_size = append_extra_args(optional_data,
654 sizeof(var->Data) - load_option_size);
655 var->DataSize = load_option_size + opt_data_size;
656 return var->DataSize;
661 variable_to_name(efi_variable_t *var, char *name)
664 efichar_to_char(p, var->VariableName, PATH_MAX);
666 p += sprintf(p, "-");
667 efi_guid_unparse(&var->VendorGuid, p);