/*
- efi.[ch] - Manipulates EFI variables as exported in /proc/efi/vars
+ efivars_proc.[ch] - Manipulates EFI variables as exported in /proc/efi/vars
Copyright (C) 2001,2003 Dell Computer Corporation <Matt_Domsch@dell.com>
#include "scsi_ioctls.h"
#include "disk.h"
#include "efibootmgr.h"
+#include "efivars_procfs.h"
+#include "efivars_sysfs.h"
+
+static struct efivar_kernel_calls *fs_kernel_calls;
EFI_DEVICE_PATH *
load_option_path(EFI_LOAD_OPTION *option)
return out;
}
-
-efi_status_t
-read_variable(char *name, efi_variable_t *var)
+void
+set_fs_kernel_calls()
{
- int newnamesize;
- char *newname;
- int fd;
- size_t readsize;
- if (!name || !var) return EFI_INVALID_PARAMETER;
-
- newnamesize = strlen(PROC_DIR_EFI_VARS) + strlen(name) + 1;
- newname = malloc(newnamesize);
- if (!newname) return EFI_OUT_OF_RESOURCES;
- sprintf(newname, "%s%s", PROC_DIR_EFI_VARS,name);
- fd = open(newname, O_RDONLY);
- if (fd == -1) {
- free(newname);
- return EFI_NOT_FOUND;
+ char name[PATH_MAX];
+ DIR *dir;
+ snprintf(name, PATH_MAX, "%s", SYSFS_DIR_EFI_VARS);
+ dir = opendir(name);
+ if (dir) {
+ closedir(dir);
+ fs_kernel_calls = &sysfs_kernel_calls;
+ return;
}
- readsize = read(fd, var, sizeof(*var));
- if (readsize != sizeof(*var)) {
- free(newname);
- close(fd);
- return EFI_INVALID_PARAMETER;
+
+ snprintf(name, PATH_MAX, "%s", PROCFS_DIR_EFI_VARS);
+ dir = opendir(name);
+ if (dir) {
+ closedir(dir);
+ fs_kernel_calls = &procfs_kernel_calls;
+ return;
}
- close(fd);
- free(newname);
- return var->Status;
+ fprintf(stderr, "Fatal: Couldn't open either sysfs or procfs directories for accessing EFI variables.\n");
+ fprintf(stderr, "Try 'modprobe efivars' as root.\n");
+ exit(1);
}
+
+
static efi_status_t
write_variable_to_file(efi_variable_t *var)
{
close(fd);
return EFI_SUCCESS;
}
-/**
- * select_variable_names()
- * @d - dirent to compare against
- *
- * This ignores "." and ".." entries, and selects all others.
- */
-static int
-select_variable_names(const struct dirent *d)
+efi_status_t
+read_variable(const char *name, efi_variable_t *var)
{
- if (!strcmp(d->d_name, ".") ||
- !strcmp(d->d_name, ".."))
- return 0;
- return 1;
+ if (!name || !var) return EFI_INVALID_PARAMETER;
+ return fs_kernel_calls->read(name, var);
}
-/**
- * find_write_victim()
- * @var - variable to be written
- * @file - name of file to open for writing @var is returned.
- *
- * This ignores "." and ".." entries, and selects all others.
- */
-static char *
-find_write_victim(efi_variable_t *var, char file[PATH_MAX])
+efi_status_t
+create_variable(efi_variable_t *var)
{
- struct dirent **namelist = NULL;
- int i, n, found=0;
- char testname[PATH_MAX], *p;
-
- memset(testname, 0, sizeof(testname));
- n = scandir(PROC_DIR_EFI_VARS, &namelist,
- select_variable_names, alphasort);
- if (n < 0) {
- perror("scandir " PROC_DIR_EFI_VARS);
- fprintf(stderr, "You must 'modprobe efivars' first.\n");
- return NULL;
- }
+ if (!var) return EFI_INVALID_PARAMETER;
+ if (opts.testfile) return write_variable_to_file(var);
+ return fs_kernel_calls->create(var);
+}
- p = testname;
- efichar_to_char(p, var->VariableName, PATH_MAX);
- p += strlen(p);
- p += sprintf(p, "-");
- efi_guid_unparse(&var->VendorGuid, p);
+efi_status_t
+delete_variable(efi_variable_t *var)
+{
+ if (!var) return EFI_INVALID_PARAMETER;
+ if (opts.testfile) return write_variable_to_file(var);
+ return fs_kernel_calls->delete(var);
+}
- for (i=0; i<n; i++) {
- if (namelist[i] &&
- strncmp(testname, namelist[i]->d_name, sizeof(testname))) {
- found++;
- sprintf(file, "%s%s", PROC_DIR_EFI_VARS,
- namelist[i]->d_name);
- break;
- }
- }
- while (n--) {
- if (namelist[n]) {
- free(namelist[n]);
- namelist[n] = NULL;
- }
- }
- free(namelist);
+efi_status_t
+edit_variable(efi_variable_t *var)
+{
+ char name[PATH_MAX];
+ if (!var) return EFI_INVALID_PARAMETER;
+ if (opts.testfile) return write_variable_to_file(var);
- if (!found) return NULL;
- return file;
+ variable_to_name(var, name);
+ return fs_kernel_calls->edit(name, var);
}
-
efi_status_t
-write_variable(efi_variable_t *var)
+create_or_edit_variable(efi_variable_t *var)
{
- int fd;
- size_t writesize;
- char buffer[PATH_MAX], name[PATH_MAX], *p = NULL;
+ efi_variable_t testvar;
+ char name[PATH_MAX];
- if (!var) return EFI_INVALID_PARAMETER;
- if (opts.testfile) return write_variable_to_file(var);
- memset(buffer, 0, sizeof(buffer));
- memset(name, 0, sizeof(name));
+ memcpy(&testvar, var, sizeof(*var));
+ variable_to_name(var, name);
- p = find_write_victim(var, name);
- if (!p) return EFI_INVALID_PARAMETER;
+ if (read_variable(name, &testvar) == EFI_SUCCESS)
+ return edit_variable(var);
+ else
+ return create_variable(var);
+}
- fd = open(name, O_WRONLY);
- if (fd == -1) {
- sprintf(buffer, "write_variable():open(%s)", name);
- perror(buffer);
- return EFI_INVALID_PARAMETER;
- }
- writesize = write(fd, var, sizeof(*var));
- if (writesize != sizeof(*var)) {
-#if 0
- sprintf(buffer, "write_variable():write(%s)", name);
- perror(buffer);
- dump_raw_data(var, sizeof(*var));
-#endif
- close(fd);
- return EFI_INVALID_PARAMETER;
+static int
+select_boot_var_names(const struct dirent *d)
+{
+ int num, rc;
+ rc = sscanf(d->d_name, "Boot0%03x-%*s", &num);
+ return rc;
+}
- }
- close(fd);
- return EFI_SUCCESS;
+int
+read_boot_var_names(struct dirent ***namelist)
+{
+ if (!fs_kernel_calls || !namelist) return -1;
+ return scandir(fs_kernel_calls->path,
+ namelist, select_boot_var_names,
+ alphasort);
}
var->DataSize = load_option_size + opt_data_size;
return var->DataSize;
}
+
+
+int
+variable_to_name(efi_variable_t *var, char *name)
+{
+ char *p = name;
+ efichar_to_char(p, var->VariableName, PATH_MAX);
+ p += strlen(p);
+ p += sprintf(p, "-");
+ efi_guid_unparse(&var->VendorGuid, p);
+ return strlen(name);
+}
projects / debian / efibootmgr / blobdiff