Merge pull request #18423 from DaanDeMeyer/sd-boot-no-include

More sd-boot cleanups

18 files changed, 355 insertions, 257 deletions

diff --git a/src/boot/efi/boot.c b/src/boot/efi/boot.c
index e1a7dd1f32..c88a6db9de 100644
--- a/src/boot/efi/boot.c
+++ b/src/boot/efi/boot.c
@@ -13,6 +13,7 @@
 #include "measure.h"
 #include "pe.h"
 #include "random-seed.h"
+#include "secure-boot.h"
 #include "shim.h"
 #include "util.h"
 
@@ -23,8 +24,6 @@
 /* magic string to find in the binary image */
 static const char __attribute__((used)) magic[] = "#### LoaderInfo: systemd-boot " GIT_VERSION " ####";
 
-static const EFI_GUID global_guid = EFI_GLOBAL_VARIABLE;
-
 enum loader_type {
         LOADER_UNDEFINED,
         LOADER_EFI,
@@ -119,17 +118,17 @@ static BOOLEAN line_edit(
         while (!exit) {
                 EFI_STATUS err;
                 UINT64 key;
-                UINTN i;
+                UINTN j;
 
-                i = len - first;
-                if (i >= x_max-1)
-                        i = x_max-1;
-                CopyMem(print, line + first, i * sizeof(CHAR16));
-                while (clear > 0 && i < x_max-1) {
+                j = len - first;
+                if (j >= x_max-1)
+                        j = x_max-1;
+                CopyMem(print, line + first, j * sizeof(CHAR16));
+                while (clear > 0 && j < x_max-1) {
                         clear--;
-                        print[i++] = ' ';
+                        print[j++] = ' ';
                 }
-                print[i] = '\0';
+                print[j] = '\0';
 
                 uefi_call_wrapper(ST->ConOut->SetCursorPosition, 3, ST->ConOut, 0, y_pos);
                 uefi_call_wrapper(ST->ConOut->OutputString, 2, ST->ConOut, print);
@@ -213,12 +212,14 @@ static BOOLEAN line_edit(
                 case KEYPRESS(EFI_ALT_PRESSED, 0, 'd'):
                         /* kill-word */
                         clear = 0;
-                        for (i = first + cursor; i < len && line[i] == ' '; i++)
+
+                        UINTN k;
+                        for (k = first + cursor; k < len && line[k] == ' '; k++)
                                 clear++;
-                        for (; i < len && line[i] != ' '; i++)
+                        for (; k < len && line[k] != ' '; k++)
                                 clear++;
 
-                        for (i = first + cursor; i + clear < len; i++)
+                        for (UINTN i = first + cursor; i + clear < len; i++)
                                 line[i] = line[i + clear];
                         len -= clear;
                         line[len] = '\0';
@@ -243,7 +244,7 @@ static BOOLEAN line_edit(
                         }
                         uefi_call_wrapper(ST->ConOut->SetCursorPosition, 3, ST->ConOut, cursor, y_pos);
 
-                        for (i = first + cursor; i + clear < len; i++)
+                        for (UINTN i = first + cursor; i + clear < len; i++)
                                 line[i] = line[i + clear];
                         len -= clear;
                         line[len] = '\0';
@@ -256,7 +257,7 @@ static BOOLEAN line_edit(
                                 continue;
                         if (first + cursor == len)
                                 continue;
-                        for (i = first + cursor; i < len; i++)
+                        for (UINTN i = first + cursor; i < len; i++)
                                 line[i] = line[i+1];
                         clear = 1;
                         len--;
@@ -285,7 +286,7 @@ static BOOLEAN line_edit(
                                 continue;
                         if (first == 0 && cursor == 0)
                                 continue;
-                        for (i = first + cursor-1; i < len; i++)
+                        for (UINTN i = first + cursor-1; i < len; i++)
                                 line[i] = line[i+1];
                         clear = 1;
                         len--;
@@ -313,7 +314,7 @@ static BOOLEAN line_edit(
                 case KEYPRESS(0, 0, 0x80) ... KEYPRESS(0, 0, 0xffff):
                         if (len+1 == size)
                                 continue;
-                        for (i = len; i > first + cursor; i--)
+                        for (UINTN i = len; i > first + cursor; i--)
                                 line[i] = line[i-1];
                         line[first + cursor] = KEYCHAR(key);
                         len++;
@@ -331,25 +332,23 @@ static BOOLEAN line_edit(
 }
 
 static UINTN entry_lookup_key(Config *config, UINTN start, CHAR16 key) {
-        UINTN i;
-
         if (key == 0)
                 return -1;
 
         /* select entry by number key */
         if (key >= '1' && key <= '9') {
-                i = key - '0';
+                UINTN i = key - '0';
                 if (i > config->entry_count)
                         i = config->entry_count;
                 return i-1;
         }
 
         /* find matching key in config entries */
-        for (i = start; i < config->entry_count; i++)
+        for (UINTN i = start; i < config->entry_count; i++)
                 if (config->entries[i]->key == key)
                         return i;
 
-        for (i = 0; i < start; i++)
+        for (UINTN i = 0; i < start; i++)
                 if (config->entries[i]->key == key)
                         return i;
 
@@ -357,11 +356,11 @@ static UINTN entry_lookup_key(Config *config, UINTN start, CHAR16 key) {
 }
 
 static VOID print_status(Config *config, CHAR16 *loaded_image_path) {
-        UINT64 key;
-        UINTN i;
-        _cleanup_freepool_ CHAR8 *bootvar = NULL, *modevar = NULL, *indvar = NULL;
+        UINT64 key, indvar;
+        UINTN timeout;
+        BOOLEAN modevar;
         _cleanup_freepool_ CHAR16 *partstr = NULL, *defaultstr = NULL;
-        UINTN x, y, size;
+        UINTN x, y;
 
         uefi_call_wrapper(ST->ConOut->SetAttribute, 2, ST->ConOut, EFI_LIGHTGRAY|EFI_BACKGROUND_BLACK);
         uefi_call_wrapper(ST->ConOut->ClearScreen, 1, ST->ConOut);
@@ -376,17 +375,16 @@ static VOID print_status(Config *config, CHAR16 *loaded_image_path) {
         if (uefi_call_wrapper(ST->ConOut->QueryMode, 4, ST->ConOut, ST->ConOut->Mode->Mode, &x, &y) == EFI_SUCCESS)
                 Print(L"console size:           %d x %d\n", x, y);
 
-        if (efivar_get_raw(&global_guid, L"SecureBoot", &bootvar, &size) == EFI_SUCCESS)
-                Print(L"SecureBoot:             %s\n", yes_no(*bootvar > 0));
+        Print(L"SecureBoot:             %s\n", yes_no(secure_boot_enabled()));
 
-        if (efivar_get_raw(&global_guid, L"SetupMode", &modevar, &size) == EFI_SUCCESS)
-                Print(L"SetupMode:              %s\n", *modevar > 0 ? L"setup" : L"user");
+        if (efivar_get_boolean_u8(EFI_GLOBAL_GUID, L"SetupMode", &modevar) == EFI_SUCCESS)
+                Print(L"SetupMode:              %s\n", modevar ? L"setup" : L"user");
 
         if (shim_loaded())
                 Print(L"Shim:                   present\n");
 
-        if (efivar_get_raw(&global_guid, L"OsIndicationsSupported", &indvar, &size) == EFI_SUCCESS)
-                Print(L"OsIndicationsSupported: %d\n", (UINT64)*indvar);
+        if (efivar_get_uint64_le(EFI_GLOBAL_GUID, L"OsIndicationsSupported", &indvar) == EFI_SUCCESS)
+                Print(L"OsIndicationsSupported: %d\n", indvar);
 
         Print(L"\n--- press key ---\n\n");
         console_key_read(&key, TRUE);
@@ -423,20 +421,20 @@ static VOID print_status(Config *config, CHAR16 *loaded_image_path) {
                 Print(L"entry EFI var idx:      %d\n", config->idx_default_efivar);
         Print(L"\n");
 
-        if (efivar_get_int(L"LoaderConfigTimeout", &i) == EFI_SUCCESS)
-                Print(L"LoaderConfigTimeout:    %u\n", i);
+        if (efivar_get_uint_string(LOADER_GUID, L"LoaderConfigTimeout", &timeout) == EFI_SUCCESS)
+                Print(L"LoaderConfigTimeout:    %u\n", timeout);
 
         if (config->entry_oneshot)
                 Print(L"LoaderEntryOneShot:     %s\n", config->entry_oneshot);
-        if (efivar_get(L"LoaderDevicePartUUID", &partstr) == EFI_SUCCESS)
+        if (efivar_get(LOADER_GUID, L"LoaderDevicePartUUID", &partstr) == EFI_SUCCESS)
                 Print(L"LoaderDevicePartUUID:   %s\n", partstr);
-        if (efivar_get(L"LoaderEntryDefault", &defaultstr) == EFI_SUCCESS)
+        if (efivar_get(LOADER_GUID, L"LoaderEntryDefault", &defaultstr) == EFI_SUCCESS)
                 Print(L"LoaderEntryDefault:     %s\n", defaultstr);
 
         Print(L"\n--- press key ---\n\n");
         console_key_read(&key, TRUE);
 
-        for (i = 0; i < config->entry_count; i++) {
+        for (UINTN i = 0; i < config->entry_count; i++) {
                 ConfigEntry *entry;
 
                 if (key == KEYPRESS(0, SCAN_ESC, 0) || key == KEYPRESS(0, 0, 'q'))
@@ -503,7 +501,6 @@ static BOOLEAN menu_run(
         UINTN idx_last;
         BOOLEAN refresh;
         BOOLEAN highlight;
-        UINTN i;
         UINTN line_width;
         CHAR16 **lines;
         UINTN x_start;
@@ -564,7 +561,7 @@ static BOOLEAN menu_run(
 
         /* length of the longest entry */
         line_width = 5;
-        for (i = 0; i < config->entry_count; i++) {
+        for (UINTN i = 0; i < config->entry_count; i++) {
                 UINTN entry_len;
 
                 entry_len = StrLen(config->entries[i]->title_show);
@@ -583,14 +580,14 @@ static BOOLEAN menu_run(
 
         /* menu entries title lines */
         lines = AllocatePool(sizeof(CHAR16 *) * config->entry_count);
-        for (i = 0; i < config->entry_count; i++) {
-                UINTN j, k;
+        for (UINTN i = 0; i < config->entry_count; i++) {
+                UINTN j;
 
                 lines[i] = AllocatePool(((x_max+1) * sizeof(CHAR16)));
                 for (j = 0; j < x_start; j++)
                         lines[i][j] = ' ';
 
-                for (k = 0; config->entries[i]->title_show[k] != '\0' && j < x_max; j++, k++)
+                for (UINTN k = 0; config->entries[i]->title_show[k] != '\0' && j < x_max; j++, k++)
                         lines[i][j] = config->entries[i]->title_show[k];
 
                 for (; j < x_max; j++)
@@ -600,15 +597,15 @@ static BOOLEAN menu_run(
 
         status = NULL;
         clearline = AllocatePool((x_max+1) * sizeof(CHAR16));
-        for (i = 0; i < x_max; i++)
+        for (UINTN i = 0; i < x_max; i++)
                 clearline[i] = ' ';
-        clearline[i] = 0;
+        clearline[x_max] = 0;
 
         while (!exit) {
                 UINT64 key;
 
                 if (refresh) {
-                        for (i = 0; i < config->entry_count; i++) {
+                        for (UINTN i = 0; i < config->entry_count; i++) {
                                 if (i < idx_first || i > idx_last)
                                         continue;
                                 uefi_call_wrapper(ST->ConOut->SetCursorPosition, 3, ST->ConOut, 0, y_start + i - idx_first);
@@ -764,12 +761,16 @@ static BOOLEAN menu_run(
                 case KEYPRESS(0, 0, 'd'):
                         if (config->idx_default_efivar != (INTN)idx_highlight) {
                                 /* store the selected entry in a persistent EFI variable */
-                                efivar_set(L"LoaderEntryDefault", config->entries[idx_highlight]->id, TRUE);
+                                efivar_set(
+                                        LOADER_GUID,
+                                        L"LoaderEntryDefault",
+                                        config->entries[idx_highlight]->id,
+                                        TRUE);
                                 config->idx_default_efivar = idx_highlight;
                                 status = StrDuplicate(L"Default boot entry selected.");
                         } else {
                                 /* clear the default entry EFI variable */
-                                efivar_set(L"LoaderEntryDefault", NULL, TRUE);
+                                efivar_set(LOADER_GUID, L"LoaderEntryDefault", NULL, TRUE);
                                 config->idx_default_efivar = -1;
                                 status = StrDuplicate(L"Default boot entry cleared.");
                         }
@@ -780,14 +781,15 @@ static BOOLEAN menu_run(
                 case KEYPRESS(0, 0, 'T'):
                         if (config->timeout_sec_efivar > 0) {
                                 config->timeout_sec_efivar--;
-                                efivar_set_int(L"LoaderConfigTimeout", config->timeout_sec_efivar, TRUE);
+                                efivar_set_uint_string(
+                                        LOADER_GUID, L"LoaderConfigTimeout", config->timeout_sec_efivar, TRUE);
                                 if (config->timeout_sec_efivar > 0)
                                         status = PoolPrint(L"Menu timeout set to %d sec.", config->timeout_sec_efivar);
                                 else
                                         status = StrDuplicate(L"Menu disabled. Hold down key at bootup to show menu.");
                         } else if (config->timeout_sec_efivar <= 0){
                                 config->timeout_sec_efivar = -1;
-                                efivar_set(L"LoaderConfigTimeout", NULL, TRUE);
+                                efivar_set(LOADER_GUID, L"LoaderConfigTimeout", NULL, TRUE);
                                 if (config->timeout_sec_config > 0)
                                         status = PoolPrint(L"Menu timeout of %d sec is defined by configuration file.",
                                                            config->timeout_sec_config);
@@ -801,7 +803,7 @@ static BOOLEAN menu_run(
                         if (config->timeout_sec_efivar == -1 && config->timeout_sec_config == 0)
                                 config->timeout_sec_efivar++;
                         config->timeout_sec_efivar++;
-                        efivar_set_int(L"LoaderConfigTimeout", config->timeout_sec_efivar, TRUE);
+                        efivar_set_uint_string(LOADER_GUID, L"LoaderConfigTimeout", config->timeout_sec_efivar, TRUE);
                         if (config->timeout_sec_efivar > 0)
                                 status = PoolPrint(L"Menu timeout set to %d sec.",
                                                    config->timeout_sec_efivar);
@@ -863,7 +865,7 @@ static BOOLEAN menu_run(
 
         *chosen_entry = config->entries[idx_highlight];
 
-        for (i = 0; i < config->entry_count; i++)
+        for (UINTN i = 0; i < config->entry_count; i++)
                 FreePool(lines[i]);
         FreePool(lines);
         FreePool(clearline);
@@ -1293,7 +1295,7 @@ static VOID config_entry_bump_counters(
         /* Let's tell the OS that we renamed this file, so that it knows what to rename to the counter-less name on
          * success */
         new_path = PoolPrint(L"%s\\%s", entry->path, entry->next_name);
-        efivar_set(L"LoaderBootCountPath", new_path, FALSE);
+        efivar_set(LOADER_GUID, L"LoaderBootCountPath", new_path, FALSE);
 
         /* If the file we just renamed is the loader path, then let's update that. */
         if (StrCmp(entry->loader, old_path) == 0) {
@@ -1458,17 +1460,17 @@ static VOID config_load_defaults(Config *config, EFI_FILE *root_dir) {
         if (!EFI_ERROR(err))
                 config_defaults_load_from_file(config, content);
 
-        err = efivar_get_int(L"LoaderConfigTimeout", &sec);
+        err = efivar_get_uint_string(LOADER_GUID, L"LoaderConfigTimeout", &sec);
         if (!EFI_ERROR(err)) {
                 config->timeout_sec_efivar = sec > INTN_MAX ? INTN_MAX : sec;
                 config->timeout_sec = sec;
         } else
                 config->timeout_sec_efivar = -1;
 
-        err = efivar_get_int(L"LoaderConfigTimeoutOneShot", &sec);
+        err = efivar_get_uint_string(LOADER_GUID, L"LoaderConfigTimeoutOneShot", &sec);
         if (!EFI_ERROR(err)) {
                 /* Unset variable now, after all it's "one shot". */
-                (void) efivar_set(L"LoaderConfigTimeoutOneShot", NULL, TRUE);
+                (void) efivar_set(LOADER_GUID, L"LoaderConfigTimeoutOneShot", NULL, TRUE);
 
                 config->timeout_sec = sec;
                 config->force_menu = TRUE; /* force the menu when this is set */
@@ -1491,7 +1493,6 @@ static VOID config_load_entries(
                         UINTN bufsize;
                         EFI_FILE_INFO *f;
                         _cleanup_freepool_ CHAR8 *content = NULL;
-                        UINTN len;
 
                         bufsize = sizeof(buf);
                         err = uefi_call_wrapper(entries_dir->Read, 3, entries_dir, &bufsize, buf);
@@ -1504,12 +1505,9 @@ static VOID config_load_entries(
                         if (f->Attribute & EFI_FILE_DIRECTORY)
                                 continue;
 
-                        len = StrLen(f->FileName);
-                        if (len < 6)
+                        if (!endswith_no_case(f->FileName, L".conf"))
                                 continue;
-                        if (StriCmp(f->FileName + len - 5, L".conf") != 0)
-                                continue;
-                        if (StrnCmp(f->FileName, L"auto-", 5) == 0)
+                        if (startswith(f->FileName, L"auto-"))
                                 continue;
 
                         err = file_read(entries_dir, f->FileName, 0, 0, &content, NULL);
@@ -1553,14 +1551,11 @@ static INTN config_entry_compare(ConfigEntry *a, ConfigEntry *b) {
 }
 
 static VOID config_sort_entries(Config *config) {
-        UINTN i;
-
-        for (i = 1; i < config->entry_count; i++) {
+        for (UINTN i = 1; i < config->entry_count; i++) {
                 BOOLEAN more;
-                UINTN k;
 
                 more = FALSE;
-                for (k = 0; k < config->entry_count - i; k++) {
+                for (UINTN k = 0; k < config->entry_count - i; k++) {
                         ConfigEntry *entry;
 
                         if (config_entry_compare(config->entries[k], config->entries[k+1]) <= 0)
@@ -1577,9 +1572,7 @@ static VOID config_sort_entries(Config *config) {
 }
 
 static INTN config_entry_find(Config *config, CHAR16 *id) {
-        UINTN i;
-
-        for (i = 0; i < config->entry_count; i++)
+        for (UINTN i = 0; i < config->entry_count; i++)
                 if (StrCmp(config->entries[i]->id, id) == 0)
                         return (INTN) i;
 
@@ -1595,11 +1588,11 @@ static VOID config_default_entry_select(Config *config) {
          * The EFI variable to specify a boot entry for the next, and only the
          * next reboot. The variable is always cleared directly after it is read.
          */
-        err = efivar_get(L"LoaderEntryOneShot", &entry_oneshot);
+        err = efivar_get(LOADER_GUID, L"LoaderEntryOneShot", &entry_oneshot);
         if (!EFI_ERROR(err)) {
 
                 config->entry_oneshot = StrDuplicate(entry_oneshot);
-                efivar_set(L"LoaderEntryOneShot", NULL, TRUE);
+                efivar_set(LOADER_GUID, L"LoaderEntryOneShot", NULL, TRUE);
 
                 i = config_entry_find(config, entry_oneshot);
                 if (i >= 0) {
@@ -1614,7 +1607,7 @@ static VOID config_default_entry_select(Config *config) {
          * the 'd' key in the loader selection menu, the entry is marked with
          * an '*'.
          */
-        err = efivar_get(L"LoaderEntryDefault", &entry_default);
+        err = efivar_get(LOADER_GUID, L"LoaderEntryDefault", &entry_default);
         if (!EFI_ERROR(err)) {
 
                 i = config_entry_find(config, entry_default);
@@ -1660,13 +1653,12 @@ static VOID config_default_entry_select(Config *config) {
 
 static BOOLEAN find_nonunique(ConfigEntry **entries, UINTN entry_count) {
         BOOLEAN non_unique = FALSE;
-        UINTN i, k;
 
-        for (i = 0; i < entry_count; i++)
+        for (UINTN i = 0; i < entry_count; i++)
                 entries[i]->non_unique = FALSE;
 
-        for (i = 0; i < entry_count; i++)
-                for (k = 0; k < entry_count; k++) {
+        for (UINTN i = 0; i < entry_count; i++)
+                for (UINTN k = 0; k < entry_count; k++) {
                         if (i == k)
                                 continue;
                         if (StrCmp(entries[i]->title_show, entries[k]->title_show) != 0)
@@ -1680,10 +1672,8 @@ static BOOLEAN find_nonunique(ConfigEntry **entries, UINTN entry_count) {
 
 /* generate a unique title, avoiding non-distinguishable menu entries */
 static VOID config_title_generate(Config *config) {
-        UINTN i;
-
         /* set title */
-        for (i = 0; i < config->entry_count; i++) {
+        for (UINTN i = 0; i < config->entry_count; i++) {
                 CHAR16 *title;
 
                 FreePool(config->entries[i]->title_show);
@@ -1697,7 +1687,7 @@ static VOID config_title_generate(Config *config) {
                 return;
 
         /* add version to non-unique titles */
-        for (i = 0; i < config->entry_count; i++) {
+        for (UINTN i = 0; i < config->entry_count; i++) {
                 CHAR16 *s;
 
                 if (!config->entries[i]->non_unique)
@@ -1714,7 +1704,7 @@ static VOID config_title_generate(Config *config) {
                 return;
 
         /* add machine-id to non-unique titles */
-        for (i = 0; i < config->entry_count; i++) {
+        for (UINTN i = 0; i < config->entry_count; i++) {
                 CHAR16 *s;
                 _cleanup_freepool_ CHAR16 *m = NULL;
 
@@ -1734,7 +1724,7 @@ static VOID config_title_generate(Config *config) {
                 return;
 
         /* add file name to non-unique titles */
-        for (i = 0; i < config->entry_count; i++) {
+        for (UINTN i = 0; i < config->entry_count; i++) {
                 CHAR16 *s;
 
                 if (!config->entries[i]->non_unique)
@@ -1826,14 +1816,10 @@ static BOOLEAN config_entry_add_loader_auto(
 
                 /* look for systemd-boot magic string */
                 err = file_read(root_dir, loader, 0, 100*1024, &content, &len);
-                if (!EFI_ERROR(err)) {
-                        CHAR8 *start = content;
-                        CHAR8 *last = content + len - sizeof(magic) - 1;
-
-                        for (; start <= last; start++)
+                if (!EFI_ERROR(err))
+                        for (CHAR8 *start = content; start <= content + len - sizeof(magic) - 1; start++)
                                 if (start[0] == magic[0] && CompareMem(start, magic, sizeof(magic) - 1) == 0)
                                         return FALSE;
-                }
         }
 
         /* check existence */
@@ -1862,9 +1848,7 @@ static VOID config_entry_add_osx(Config *config) {
 
         err = LibLocateHandle(ByProtocol, &FileSystemProtocol, NULL, &handle_count, &handles);
         if (!EFI_ERROR(err)) {
-                UINTN i;
-
-                for (i = 0; i < handle_count; i++) {
+                for (UINTN i = 0; i < handle_count; i++) {
                         EFI_FILE *root;
                         BOOLEAN found;
 
@@ -1906,7 +1890,6 @@ static VOID config_entry_add_linux(
                 UINTN szs[ELEMENTSOF(sections)-1] = {};
                 UINTN addrs[ELEMENTSOF(sections)-1] = {};
                 CHAR8 *content = NULL;
-                UINTN len;
                 CHAR8 *line;
                 UINTN pos = 0;
                 CHAR8 *key, *value;
@@ -1926,12 +1909,9 @@ static VOID config_entry_add_linux(
                         continue;
                 if (f->Attribute & EFI_FILE_DIRECTORY)
                         continue;
-                len = StrLen(f->FileName);
-                if (len < 5)
+                if (!endswith_no_case(f->FileName, L".efi"))
                         continue;
-                if (StriCmp(f->FileName + len - 4, L".efi") != 0)
-                        continue;
-                if (StrnCmp(f->FileName, L"auto-", 5) == 0)
+                if (startswith(f->FileName, L"auto-"))
                         continue;
 
                 /* look for .osrel and .cmdline sections in the .efi binary */
@@ -2020,10 +2000,8 @@ static VOID config_entry_add_linux(
         uefi_call_wrapper(linux_dir->Close, 1, linux_dir);
 }
 
-/* Note that this is in GUID format, i.e. the first 32bit, and the following pair of 16bit are byteswapped. */
-static const UINT8 xbootldr_guid[16] = {
-        0xff, 0xc2, 0x13, 0xbc, 0xe6, 0x59, 0x62, 0x42, 0xa3, 0x52, 0xb2, 0x75, 0xfd, 0x6f, 0x71, 0x72
-};
+#define XBOOTLDR_GUID \
+        &(const EFI_GUID) { 0xbc13c2ff, 0x59e6, 0x4262, { 0xa3, 0x52, 0xb2, 0x75, 0xfd, 0x6f, 0x71, 0x72 } }
 
 static EFI_DEVICE_PATH *path_parent(EFI_DEVICE_PATH *path, EFI_DEVICE_PATH *node) {
         EFI_DEVICE_PATH *parent;
@@ -2041,7 +2019,7 @@ static VOID config_load_xbootldr(
                 Config *config,
                 EFI_HANDLE *device) {
 
-        EFI_DEVICE_PATH *partition_path, *node, *disk_path, *copy;
+        EFI_DEVICE_PATH *partition_path, *disk_path, *copy;
         UINT32 found_partition_number = (UINT32) -1;
         UINT64 found_partition_start = (UINT64) -1;
         UINT64 found_partition_size = (UINT64) -1;
@@ -2054,11 +2032,10 @@ static VOID config_load_xbootldr(
         if (!partition_path)
                 return;
 
-        for (node = partition_path; !IsDevicePathEnd(node); node = NextDevicePathNode(node)) {
+        for (EFI_DEVICE_PATH *node = partition_path; !IsDevicePathEnd(node); node = NextDevicePathNode(node)) {
                 EFI_HANDLE disk_handle;
                 EFI_BLOCK_IO *block_io;
                 EFI_DEVICE_PATH *p;
-                UINTN nr;
 
                 /* First, Let's look for the SCSI/SATA/USB/… device path node, i.e. one above the media
                  * devices */
@@ -2085,7 +2062,7 @@ static VOID config_load_xbootldr(
                         continue;
 
                 /* Try both copies of the GPT header, in case one is corrupted */
-                for (nr = 0; nr < 2; nr++) {
+                for (UINTN nr = 0; nr < 2; nr++) {
                         _cleanup_freepool_ EFI_PARTITION_ENTRY* entries = NULL;
                         union {
                                 EFI_PARTITION_TABLE_HEADER gpt_header;
@@ -2093,7 +2070,7 @@ static VOID config_load_xbootldr(
                         } gpt_header_buffer;
                         const EFI_PARTITION_TABLE_HEADER *h = &gpt_header_buffer.gpt_header;
                         UINT64 where;
-                        UINTN i, sz;
+                        UINTN sz;
                         UINT32 c;
 
                         if (nr == 0)
@@ -2163,12 +2140,12 @@ static VOID config_load_xbootldr(
                         if (c != h->PartitionEntryArrayCRC32)
                                 continue;
 
-                        for (i = 0; i < h->NumberOfPartitionEntries; i++) {
+                        for (UINTN i = 0; i < h->NumberOfPartitionEntries; i++) {
                                 EFI_PARTITION_ENTRY *entry;
 
                                 entry = (EFI_PARTITION_ENTRY*) ((UINT8*) entries + h->SizeOfPartitionEntry * i);
 
-                                if (CompareMem(&entry->PartitionTypeGUID, xbootldr_guid, 16) == 0) {
+                                if (CompareMem(&entry->PartitionTypeGUID, XBOOTLDR_GUID, 16) == 0) {
                                         UINT64 end;
 
                                         /* Let's use memcpy(), in case the structs are not aligned (they really should be though) */
@@ -2197,7 +2174,7 @@ found:
         copy = DuplicateDevicePath(partition_path);
 
         /* Patch in the data we found */
-        for (node = copy; !IsDevicePathEnd(node); node = NextDevicePathNode(node)) {
+        for (EFI_DEVICE_PATH *node = copy; !IsDevicePathEnd(node); node = NextDevicePathNode(node)) {
                 HARDDRIVE_DEVICE_PATH *hd;
 
                 if (DevicePathType(node) != MEDIA_DEVICE_PATH)
@@ -2282,7 +2259,7 @@ static EFI_STATUS image_start(
 #endif
         }
 
-        efivar_set_time_usec(L"LoaderTimeExecUSec", 0);
+        efivar_set_time_usec(LOADER_GUID, L"LoaderTimeExecUSec", 0);
         err = uefi_call_wrapper(BS->StartImage, 3, image, NULL, NULL);
 out_unload:
         uefi_call_wrapper(BS->UnloadImage, 1, image);
@@ -2290,18 +2267,16 @@ out_unload:
 }
 
 static EFI_STATUS reboot_into_firmware(VOID) {
-        _cleanup_freepool_ CHAR8 *b = NULL;
-        UINTN size;
-        UINT64 osind;
+        UINT64 old, new;
         EFI_STATUS err;
 
-        osind = EFI_OS_INDICATIONS_BOOT_TO_FW_UI;
+        new = EFI_OS_INDICATIONS_BOOT_TO_FW_UI;
 
-        err = efivar_get_raw(&global_guid, L"OsIndications", &b, &size);
+        err = efivar_get_uint64_le(EFI_GLOBAL_GUID, L"OsIndications", &old);
         if (!EFI_ERROR(err))
-                osind |= (UINT64)*b;
+                new |= old;
 
-        err = efivar_set_raw(&global_guid, L"OsIndications", &osind, sizeof(UINT64), TRUE);
+        err = efivar_set_uint64_le(EFI_GLOBAL_GUID, L"OsIndications", new, TRUE);
         if (EFI_ERROR(err))
                 return err;
 
@@ -2312,9 +2287,7 @@ static EFI_STATUS reboot_into_firmware(VOID) {
 }
 
 static VOID config_free(Config *config) {
-        UINTN i;
-
-        for (i = 0; i < config->entry_count; i++)
+        for (UINTN i = 0; i < config->entry_count; i++)
                 config_entry_free(config->entries[i]);
         FreePool(config->entries);
         FreePool(config->entry_default_pattern);
@@ -2324,15 +2297,15 @@ static VOID config_free(Config *config) {
 
 static VOID config_write_entries_to_variable(Config *config) {
         _cleanup_freepool_ CHAR16 *buffer = NULL;
-        UINTN i, sz = 0;
+        UINTN sz = 0;
         CHAR16 *p;
 
-        for (i = 0; i < config->entry_count; i++)
+        for (UINTN i = 0; i < config->entry_count; i++)
                 sz += StrLen(config->entries[i]->id) + 1;
 
         p = buffer = AllocatePool(sz * sizeof(CHAR16));
 
-        for (i = 0; i < config->entry_count; i++) {
+        for (UINTN i = 0; i < config->entry_count; i++) {
                 UINTN l;
 
                 l = StrLen(config->entries[i]->id) + 1;
@@ -2342,7 +2315,7 @@ static VOID config_write_entries_to_variable(Config *config) {
         }
 
         /* Store the full list of discovered entries. */
-        (void) efivar_set_raw(&loader_guid, L"LoaderEntries", buffer, (UINT8*) p - (UINT8*) buffer, FALSE);
+        (void) efivar_set_raw(LOADER_GUID, L"LoaderEntries", buffer, (UINT8*) p - (UINT8*) buffer, FALSE);
 }
 
 EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
@@ -2357,8 +2330,7 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
                 0;
 
         _cleanup_freepool_ CHAR16 *infostr = NULL, *typestr = NULL;
-        CHAR8 *b;
-        UINTN size;
+        UINT64 osind = 0;
         EFI_LOADED_IMAGE *loaded_image;
         EFI_FILE *root_dir;
         CHAR16 *loaded_image_path;
@@ -2370,16 +2342,16 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
 
         InitializeLib(image, sys_table);
         init_usec = time_usec();
-        efivar_set_time_usec(L"LoaderTimeInitUSec", init_usec);
-        efivar_set(L"LoaderInfo", L"systemd-boot " GIT_VERSION, FALSE);
+        efivar_set_time_usec(LOADER_GUID, L"LoaderTimeInitUSec", init_usec);
+        efivar_set(LOADER_GUID, L"LoaderInfo", L"systemd-boot " GIT_VERSION, FALSE);
 
         infostr = PoolPrint(L"%s %d.%02d", ST->FirmwareVendor, ST->FirmwareRevision >> 16, ST->FirmwareRevision & 0xffff);
-        efivar_set(L"LoaderFirmwareInfo", infostr, FALSE);
+        efivar_set(LOADER_GUID, L"LoaderFirmwareInfo", infostr, FALSE);
 
         typestr = PoolPrint(L"UEFI %d.%02d", ST->Hdr.Revision >> 16, ST->Hdr.Revision & 0xffff);
-        efivar_set(L"LoaderFirmwareType", typestr, FALSE);
+        efivar_set(LOADER_GUID, L"LoaderFirmwareType", typestr, FALSE);
 
-        (void) efivar_set_raw(&loader_guid, L"LoaderFeatures", &loader_features, sizeof(loader_features), FALSE);
+        (void) efivar_set_uint64_le(LOADER_GUID, L"LoaderFeatures", loader_features, FALSE);
 
         err = uefi_call_wrapper(BS->OpenProtocol, 6, image, &LoadedImageProtocol, (VOID **)&loaded_image,
                                 image, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
@@ -2391,7 +2363,7 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
 
         /* export the device path this image is started from */
         if (disk_get_part_uuid(loaded_image->DeviceHandle, uuid) == EFI_SUCCESS)
-                efivar_set(L"LoaderDevicePartUUID", uuid, FALSE);
+                efivar_set(LOADER_GUID, L"LoaderDevicePartUUID", uuid, FALSE);
 
         root_dir = LibOpenRoot(loaded_image->DeviceHandle);
         if (!root_dir) {
@@ -2411,7 +2383,7 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
 
         /* the filesystem path to this image, to prevent adding ourselves to the menu */
         loaded_image_path = DevicePathToStr(loaded_image->FilePath);
-        efivar_set(L"LoaderImageIdentifier", loaded_image_path, FALSE);
+        efivar_set(LOADER_GUID, L"LoaderImageIdentifier", loaded_image_path, FALSE);
 
         config_load_defaults(&config, root_dir);
 
@@ -2436,15 +2408,12 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
                                      L"auto-efi-default", '\0', L"EFI Default Loader", L"\\EFI\\Boot\\boot" EFI_MACHINE_TYPE_NAME ".efi");
         config_entry_add_osx(&config);
 
-        if (config.auto_firmware && efivar_get_raw(&global_guid, L"OsIndicationsSupported", &b, &size) == EFI_SUCCESS) {
-                UINT64 osind = (UINT64)*b;
-
+        if (config.auto_firmware && efivar_get_uint64_le(EFI_GLOBAL_GUID, L"OsIndicationsSupported", &osind) == EFI_SUCCESS) {
                 if (osind & EFI_OS_INDICATIONS_BOOT_TO_FW_UI)
                         config_entry_add_call(&config,
                                               L"auto-reboot-to-firmware-setup",
                                               L"Reboot Into Firmware Interface",
                                               reboot_into_firmware);
-                FreePool(b);
         }
 
         if (config.entry_count == 0) {
@@ -2497,7 +2466,7 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
 
                 entry = config.entries[config.idx_default];
                 if (menu) {
-                        efivar_set_time_usec(L"LoaderTimeMenuUSec", 0);
+                        efivar_set_time_usec(LOADER_GUID, L"LoaderTimeMenuUSec", 0);
                         uefi_call_wrapper(BS->SetWatchdogTimer, 4, 0, 0x10000, 0, NULL);
                         if (!menu_run(&config, &entry, loaded_image_path))
                                 break;
@@ -2512,7 +2481,7 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
                 config_entry_bump_counters(entry, root_dir);
 
                 /* Export the selected boot entry to the system */
-                (VOID) efivar_set(L"LoaderEntrySelected", entry->id, FALSE);
+                (VOID) efivar_set(LOADER_GUID, L"LoaderEntrySelected", entry->id, FALSE);
 
                 /* Optionally, read a random seed off the ESP and pass it to the OS */
                 (VOID) process_random_seed(root_dir, config.random_seed_mode);
diff --git a/src/boot/efi/console.c b/src/boot/efi/console.c
index 2dd4543d51..e3de27fee5 100644
--- a/src/boot/efi/console.c
+++ b/src/boot/efi/console.c
@@ -9,8 +9,8 @@
 #define SYSTEM_FONT_WIDTH 8
 #define SYSTEM_FONT_HEIGHT 19
 
-#define EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL_GUID \
-        { 0xdd9e7534, 0x7762, 0x4698, { 0x8c, 0x14, 0xf5, 0x85, 0x17, 0xa6, 0x25, 0xaa } }
+#define EFI_SIMPLE_TEXT_INPUT_EX_GUID \
+        &(EFI_GUID) { 0xdd9e7534, 0x7762, 0x4698, { 0x8c, 0x14, 0xf5, 0x85, 0x17, 0xa6, 0x25, 0xaa } }
 
 struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL;
 
@@ -67,7 +67,6 @@ typedef struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL {
 } EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL;
 
 EFI_STATUS console_key_read(UINT64 *key, BOOLEAN wait) {
-        EFI_GUID EfiSimpleTextInputExProtocolGuid = EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL_GUID;
         static EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *TextInputEx;
         static BOOLEAN checked;
         UINTN index;
@@ -75,7 +74,7 @@ EFI_STATUS console_key_read(UINT64 *key, BOOLEAN wait) {
         EFI_STATUS err;
 
         if (!checked) {
-                err = LibLocateProtocol(&EfiSimpleTextInputExProtocolGuid, (VOID **)&TextInputEx);
+                err = LibLocateProtocol(EFI_SIMPLE_TEXT_INPUT_EX_GUID, (VOID **)&TextInputEx);
                 if (EFI_ERROR(err))
                         TextInputEx = NULL;
 
diff --git a/src/boot/efi/crc32.c b/src/boot/efi/crc32.c
index 5dfd3db265..c9e5501ffa 100644
--- a/src/boot/efi/crc32.c
+++ b/src/boot/efi/crc32.c
@@ -128,9 +128,8 @@ UINT32 crc32_exclude_offset(
 
         const UINT8 *p = buf;
         UINT32 crc = seed;
-        UINTN i;
 
-        for (i = 0; i < len; i++) {
+        for (UINTN i = 0; i < len; i++) {
                 UINT8 x = *p++;
 
                 if (i >= exclude_off && i < exclude_off + exclude_len)
diff --git a/src/boot/efi/disk.c b/src/boot/efi/disk.c
index cc752956c3..122f08dd5c 100644
--- a/src/boot/efi/disk.c
+++ b/src/boot/efi/disk.c
@@ -13,10 +13,9 @@ EFI_STATUS disk_get_part_uuid(EFI_HANDLE *handle, CHAR16 uuid[static 37]) {
         device_path = DevicePathFromHandle(handle);
         if (device_path) {
                 _cleanup_freepool_ EFI_DEVICE_PATH *paths = NULL;
-                EFI_DEVICE_PATH *path;
 
                 paths = UnpackDevicePath(device_path);
-                for (path = paths; !IsDevicePathEnd(path); path = NextDevicePathNode(path)) {
+                for (EFI_DEVICE_PATH *path = paths; !IsDevicePathEnd(path); path = NextDevicePathNode(path)) {
                         HARDDRIVE_DEVICE_PATH *drive;
 
                         if (DevicePathType(path) != MEDIA_DEVICE_PATH)
diff --git a/src/boot/efi/graphics.c b/src/boot/efi/graphics.c
index f36ecb35b5..ddfe68cc77 100644
--- a/src/boot/efi/graphics.c
+++ b/src/boot/efi/graphics.c
@@ -10,9 +10,10 @@
 #include "graphics.h"
 #include "util.h"
 
+#define EFI_CONSOLE_CONTROL_GUID \
+        &(EFI_GUID) { 0xf42f7782, 0x12e, 0x4c12, { 0x99, 0x56, 0x49, 0xf9, 0x43, 0x4, 0xf7, 0x21 } }
+
 EFI_STATUS graphics_mode(BOOLEAN on) {
-        #define EFI_CONSOLE_CONTROL_PROTOCOL_GUID \
-                { 0xf42f7782, 0x12e, 0x4c12, { 0x99, 0x56, 0x49, 0xf9, 0x43, 0x4, 0xf7, 0x21 } };
 
         struct _EFI_CONSOLE_CONTROL_PROTOCOL;
 
@@ -45,7 +46,6 @@ EFI_STATUS graphics_mode(BOOLEAN on) {
                 EFI_CONSOLE_CONTROL_PROTOCOL_LOCK_STD_IN LockStdIn;
         } EFI_CONSOLE_CONTROL_PROTOCOL;
 
-        EFI_GUID ConsoleControlProtocolGuid = EFI_CONSOLE_CONTROL_PROTOCOL_GUID;
         EFI_CONSOLE_CONTROL_PROTOCOL *ConsoleControl = NULL;
         EFI_CONSOLE_CONTROL_SCREEN_MODE new;
         EFI_CONSOLE_CONTROL_SCREEN_MODE current;
@@ -53,7 +53,7 @@ EFI_STATUS graphics_mode(BOOLEAN on) {
         BOOLEAN stdin_locked;
         EFI_STATUS err;
 
-        err = LibLocateProtocol(&ConsoleControlProtocolGuid, (VOID **)&ConsoleControl);
+        err = LibLocateProtocol(EFI_CONSOLE_CONTROL_GUID, (VOID **)&ConsoleControl);
         if (EFI_ERROR(err))
                 /* console control protocol is nonstandard and might not exist. */
                 return err == EFI_NOT_FOUND ? EFI_SUCCESS : err;
diff --git a/src/boot/efi/measure.c b/src/boot/efi/measure.c
index ff876a6c5b..c272d08553 100644
--- a/src/boot/efi/measure.c
+++ b/src/boot/efi/measure.c
@@ -4,9 +4,11 @@
 
 #include <efi.h>
 #include <efilib.h>
+
 #include "measure.h"
 
-#define EFI_TCG_PROTOCOL_GUID { 0xf541796d, 0xa62e, 0x4954, {0xa7, 0x75, 0x95, 0x84, 0xf6, 0x1b, 0x9c, 0xdd} }
+#define EFI_TCG_GUID \
+        &(EFI_GUID) { 0xf541796d, 0xa62e, 0x4954, { 0xa7, 0x75, 0x95, 0x84, 0xf6, 0x1b, 0x9c, 0xdd } }
 
 typedef struct _TCG_VERSION {
         UINT8 Major;
@@ -100,7 +102,8 @@ typedef struct _EFI_TCG {
         EFI_TCG_HASH_LOG_EXTEND_EVENT HashLogExtendEvent;
 } EFI_TCG;
 
-#define EFI_TCG2_PROTOCOL_GUID {0x607f766c, 0x7455, 0x42be, { 0x93, 0x0b, 0xe4, 0xd7, 0x6d, 0xb2, 0x72, 0x0f }}
+#define EFI_TCG2_GUID \
+        &(EFI_GUID) { 0x607f766c, 0x7455, 0x42be, { 0x93, 0x0b, 0xe4, 0xd7, 0x6d, 0xb2, 0x72, 0x0f } }
 
 typedef struct tdEFI_TCG2_PROTOCOL EFI_TCG2_PROTOCOL;
 
@@ -238,7 +241,6 @@ static EFI_STATUS tpm2_measure_to_pcr_and_event_log(const EFI_TCG2 *tcg, UINT32
 }
 
 static EFI_TCG * tcg1_interface_check(void) {
-        EFI_GUID tpm_guid = EFI_TCG_PROTOCOL_GUID;
         EFI_STATUS status;
         EFI_TCG *tcg;
         TCG_BOOT_SERVICE_CAPABILITY capability;
@@ -246,7 +248,7 @@ static EFI_TCG * tcg1_interface_check(void) {
         EFI_PHYSICAL_ADDRESS event_log_location;
         EFI_PHYSICAL_ADDRESS event_log_last_entry;
 
-        status = LibLocateProtocol(&tpm_guid, (void **) &tcg);
+        status = LibLocateProtocol(EFI_TCG_GUID, (void **) &tcg);
 
         if (EFI_ERROR(status))
                 return NULL;
@@ -267,12 +269,11 @@ static EFI_TCG * tcg1_interface_check(void) {
 }
 
 static EFI_TCG2 * tcg2_interface_check(void) {
-        EFI_GUID tpm2_guid = EFI_TCG2_PROTOCOL_GUID;
         EFI_STATUS status;
         EFI_TCG2 *tcg;
         EFI_TCG2_BOOT_SERVICE_CAPABILITY capability;
 
-        status = LibLocateProtocol(&tpm2_guid, (void **) &tcg);
+        status = LibLocateProtocol(EFI_TCG2_GUID, (void **) &tcg);
 
         if (EFI_ERROR(status))
                 return NULL;
diff --git a/src/boot/efi/meson.build b/src/boot/efi/meson.build
index 24177f9384..177957e76a 100644
--- a/src/boot/efi/meson.build
+++ b/src/boot/efi/meson.build
@@ -21,6 +21,7 @@ common_sources = '''
         graphics.c
         measure.c
         pe.c
+        secure-boot.c
         util.c
 '''.split()
 
@@ -133,8 +134,8 @@ endif
 if have_gnu_efi
         compile_args = ['-Wall',
                         '-Wextra',
-                        '-std=gnu90',
-                        '-nostdinc',
+                        '-std=gnu99',
+                        '-nostdlib',
                         '-fpic',
                         '-fshort-wchar',
                         '-ffreestanding',
diff --git a/src/boot/efi/pe.c b/src/boot/efi/pe.c
index f99ecd0eda..cb35838072 100644
--- a/src/boot/efi/pe.c
+++ b/src/boot/efi/pe.c
@@ -62,7 +62,6 @@ struct PeSectionHeader {
 EFI_STATUS pe_memory_locate_sections(CHAR8 *base, CHAR8 **sections, UINTN *addrs, UINTN *offsets, UINTN *sizes) {
         struct DosFileHeader *dos;
         struct PeHeader *pe;
-        UINTN i;
         UINTN offset;
 
         dos = (struct DosFileHeader *)base;
@@ -85,12 +84,11 @@ EFI_STATUS pe_memory_locate_sections(CHAR8 *base, CHAR8 **sections, UINTN *addrs
 
         offset = dos->ExeHeader + sizeof(*pe) + pe->FileHeader.SizeOfOptionalHeader;
 
-        for (i = 0; i < pe->FileHeader.NumberOfSections; i++) {
+        for (UINTN i = 0; i < pe->FileHeader.NumberOfSections; i++) {
                 struct PeSectionHeader *sect;
-                UINTN j;
 
                 sect = (struct PeSectionHeader *)&base[offset];
-                for (j = 0; sections[j]; j++) {
+                for (UINTN j = 0; sections[j]; j++) {
                         if (CompareMem(sect->Name, sections[j], strlena(sections[j])) != 0)
                                 continue;
 
diff --git a/src/boot/efi/random-seed.c b/src/boot/efi/random-seed.c
index 895c85445e..cd40252607 100644
--- a/src/boot/efi/random-seed.c
+++ b/src/boot/efi/random-seed.c
@@ -5,14 +5,14 @@
 
 #include "missing_efi.h"
 #include "random-seed.h"
+#include "secure-boot.h"
 #include "sha256.h"
 #include "util.h"
-#include "shim.h"
 
 #define RANDOM_MAX_SIZE_MIN (32U)
 #define RANDOM_MAX_SIZE_MAX (32U*1024U)
 
-static const EFI_GUID rng_protocol_guid = EFI_RNG_PROTOCOL_GUID;
+#define EFI_RNG_GUID &(EFI_GUID) EFI_RNG_PROTOCOL_GUID
 
 /* SHA256 gives us 256/8=32 bytes */
 #define HASH_VALUE_SIZE 32
@@ -24,7 +24,7 @@ static EFI_STATUS acquire_rng(UINTN size, VOID **ret) {
 
         /* Try to acquire the specified number of bytes from the UEFI RNG */
 
-        err = LibLocateProtocol((EFI_GUID*) &rng_protocol_guid, (VOID**) &rng);
+        err = LibLocateProtocol(EFI_RNG_GUID, (VOID**) &rng);
         if (EFI_ERROR(err))
                 return err;
         if (!rng)
@@ -86,7 +86,6 @@ static EFI_STATUS hash_many(
                 VOID **ret) {
 
         _cleanup_freepool_ VOID *output = NULL;
-        UINTN i;
 
         /* Hashes the specified parameters in counter mode, generating n hash values, with the counter in the
          * range counter_start…counter_start+n-1. */
@@ -95,7 +94,7 @@ static EFI_STATUS hash_many(
         if (!output)
                 return log_oom();
 
-        for (i = 0; i < n; i++)
+        for (UINTN i = 0; i < n; i++)
                 hash_once(old_seed, rng, size,
                           system_token, system_token_size,
                           counter_start + i,
@@ -147,7 +146,7 @@ static EFI_STATUS acquire_system_token(VOID **ret, UINTN *ret_size) {
         EFI_STATUS err;
         UINTN size;
 
-        err = efivar_get_raw(&loader_guid, L"LoaderSystemToken", &data, &size);
+        err = efivar_get_raw(LOADER_GUID, L"LoaderSystemToken", &data, &size);
         if (EFI_ERROR(err)) {
                 if (err != EFI_NOT_FOUND)
                         Print(L"Failed to read LoaderSystemToken EFI variable: %r", err);
@@ -201,9 +200,7 @@ static VOID validate_sha256(void) {
                     0xaf, 0xac, 0x45, 0x03, 0x7a, 0xfe, 0xe9, 0xd1 }},
         };
 
-        UINTN i;
-
-        for (i = 0; i < ELEMENTSOF(array); i++) {
+        for (UINTN i = 0; i < ELEMENTSOF(array); i++) {
                 struct sha256_ctx hash;
                 uint8_t result[HASH_VALUE_SIZE];
 
@@ -318,7 +315,7 @@ EFI_STATUS process_random_seed(EFI_FILE *root_dir, RandomSeedMode mode) {
         }
 
         /* We are good to go */
-        err = efivar_set_raw(&loader_guid, L"LoaderRandomSeed", for_kernel, size, FALSE);
+        err = efivar_set_raw(LOADER_GUID, L"LoaderRandomSeed", for_kernel, size, FALSE);
         if (EFI_ERROR(err)) {
                 Print(L"Failed to write random seed to EFI variable: %r\n", err);
                 return err;
diff --git a/src/boot/efi/secure-boot.c b/src/boot/efi/secure-boot.c
new file mode 100644
index 0000000000..cacf3b6a7b
--- /dev/null
+++ b/src/boot/efi/secure-boot.c
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "secure-boot.h"
+#include "util.h"
+
+BOOLEAN secure_boot_enabled(void) {
+        BOOLEAN secure;
+        EFI_STATUS err;
+
+        err = efivar_get_boolean_u8(EFI_GLOBAL_GUID, L"SecureBoot", &secure);
+
+        return !EFI_ERROR(err) && secure;
+}
diff --git a/src/boot/efi/secure-boot.h b/src/boot/efi/secure-boot.h
new file mode 100644
index 0000000000..d06a7deaaa
--- /dev/null
+++ b/src/boot/efi/secure-boot.h
@@ -0,0 +1,6 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <efi.h>
+
+BOOLEAN secure_boot_enabled(void);
diff --git a/src/boot/efi/sha256.c b/src/boot/efi/sha256.c
index f23066d0ac..774f0eeb6c 100644
--- a/src/boot/efi/sha256.c
+++ b/src/boot/efi/sha256.c
@@ -94,7 +94,7 @@ void sha256_init_ctx(struct sha256_ctx *ctx) {
 void *sha256_finish_ctx(struct sha256_ctx *ctx, void *resbuf) {
         /* Take yet unprocessed bytes into account.  */
         UINT32 bytes = ctx->buflen;
-        UINTN pad, i;
+        UINTN pad;
 
         /* Now count remaining bytes.  */
         ctx->total64 += bytes;
@@ -111,7 +111,7 @@ void *sha256_finish_ctx(struct sha256_ctx *ctx, void *resbuf) {
         sha256_process_block (ctx->buffer, bytes + pad + 8, ctx);
 
         /* Put result from CTX in first 32 bytes following RESBUF.  */
-        for (i = 0; i < 8; ++i)
+        for (UINTN i = 0; i < 8; ++i)
                 ((UINT32 *) resbuf)[i] = SWAP (ctx->H[i]);
 
         return resbuf;
@@ -214,7 +214,6 @@ static void sha256_process_block(const void *buffer, UINTN len, struct sha256_ct
                 UINT32 f_save = f;
                 UINT32 g_save = g;
                 UINT32 h_save = h;
-                UINTN t;
 
                 /* Operators defined in FIPS 180-2:4.1.2.  */
 #define Ch(x, y, z) ((x & y) ^ (~x & z))
@@ -229,15 +228,15 @@ static void sha256_process_block(const void *buffer, UINTN len, struct sha256_ct
 #define CYCLIC(w, s) ((w >> s) | (w << (32 - s)))
 
                 /* Compute the message schedule according to FIPS 180-2:6.2.2 step 2.  */
-                for (t = 0; t < 16; ++t) {
+                for (UINTN t = 0; t < 16; ++t) {
                         W[t] = SWAP (*words);
                         ++words;
                 }
-                for (t = 16; t < 64; ++t)
+                for (UINTN t = 16; t < 64; ++t)
                         W[t] = R1 (W[t - 2]) + W[t - 7] + R0 (W[t - 15]) + W[t - 16];
 
                 /* The actual computation according to FIPS 180-2:6.2.2 step 3.  */
-                for (t = 0; t < 64; ++t) {
+                for (UINTN t = 0; t < 64; ++t) {
                         UINT32 T1 = h + S1 (e) + Ch (e, f, g) + K[t] + W[t];
                         UINT32 T2 = S0 (a) + Maj (a, b, c);
                         h = g;
diff --git a/src/boot/efi/shim.c b/src/boot/efi/shim.c
index 3dc10089c6..48602627bb 100644
--- a/src/boot/efi/shim.c
+++ b/src/boot/efi/shim.c
@@ -30,17 +30,18 @@ struct ShimLock {
         EFI_STATUS __sysv_abi__ (*read_header) (VOID *data, UINT32 datasize, VOID *context);
 };
 
-static const EFI_GUID simple_fs_guid = SIMPLE_FILE_SYSTEM_PROTOCOL;
-static const EFI_GUID global_guid = EFI_GLOBAL_VARIABLE;
-
-static const EFI_GUID security_protocol_guid = { 0xa46423e3, 0x4617, 0x49f1, {0xb9, 0xff, 0xd1, 0xbf, 0xa9, 0x11, 0x58, 0x39 } };
-static const EFI_GUID security2_protocol_guid = { 0x94ab2f58, 0x1438, 0x4ef1, {0x91, 0x52, 0x18, 0x94, 0x1a, 0x3a, 0x0e, 0x68 } };
-static const EFI_GUID shim_lock_guid = { 0x605dab50, 0xe046, 0x4300, {0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23} };
+#define SIMPLE_FS_GUID &(EFI_GUID) SIMPLE_FILE_SYSTEM_PROTOCOL
+#define SECURITY_PROTOCOL_GUID \
+        &(EFI_GUID) { 0xa46423e3, 0x4617, 0x49f1, { 0xb9, 0xff, 0xd1, 0xbf, 0xa9, 0x11, 0x58, 0x39 } }
+#define SECURITY_PROTOCOL2_GUID \
+        &(EFI_GUID) { 0x94ab2f58, 0x1438, 0x4ef1, { 0x91, 0x52, 0x18, 0x94, 0x1a, 0x3a, 0x0e, 0x68 } }
+#define SHIM_LOCK_GUID \
+        &(EFI_GUID) { 0x605dab50, 0xe046, 0x4300, { 0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23 } }
 
 BOOLEAN shim_loaded(void) {
         struct ShimLock *shim_lock;
 
-        return uefi_call_wrapper(BS->LocateProtocol, 3, (EFI_GUID*) &shim_lock_guid, NULL, (VOID**) &shim_lock) == EFI_SUCCESS;
+        return uefi_call_wrapper(BS->LocateProtocol, 3, SHIM_LOCK_GUID, NULL, (VOID**) &shim_lock) == EFI_SUCCESS;
 }
 
 static BOOLEAN shim_validate(VOID *data, UINT32 size) {
@@ -49,7 +50,7 @@ static BOOLEAN shim_validate(VOID *data, UINT32 size) {
         if (!data)
                 return FALSE;
 
-        if (uefi_call_wrapper(BS->LocateProtocol, 3, (EFI_GUID*) &shim_lock_guid, NULL, (VOID**) &shim_lock) != EFI_SUCCESS)
+        if (uefi_call_wrapper(BS->LocateProtocol, 3, SHIM_LOCK_GUID, NULL, (VOID**) &shim_lock) != EFI_SUCCESS)
                 return FALSE;
 
         if (!shim_lock)
@@ -58,16 +59,6 @@ static BOOLEAN shim_validate(VOID *data, UINT32 size) {
         return shim_lock->shim_verify(data, size) == EFI_SUCCESS;
 }
 
-BOOLEAN secure_boot_enabled(void) {
-        _cleanup_freepool_ CHAR8 *b = NULL;
-        UINTN size;
-
-        if (efivar_get_raw(&global_guid, L"SecureBoot", &b, &size) == EFI_SUCCESS)
-                return *b > 0;
-
-        return FALSE;
-}
-
 /*
  * See the UEFI Platform Initialization manual (Vol2: DXE) for this
  */
@@ -157,7 +148,7 @@ static EFIAPI EFI_STATUS security_policy_authentication (const EFI_SECURITY_PROT
 
         dev_path = DuplicateDevicePath((EFI_DEVICE_PATH*) device_path_const);
 
-        status = uefi_call_wrapper(BS->LocateDevicePath, 3, (EFI_GUID*) &simple_fs_guid, &dev_path, &h);
+        status = uefi_call_wrapper(BS->LocateDevicePath, 3, SIMPLE_FS_GUID, &dev_path, &h);
         if (status != EFI_SUCCESS)
                 return status;
 
@@ -191,9 +182,9 @@ EFI_STATUS security_policy_install(void) {
          * to fail, since SECURITY2 was introduced in PI 1.2.1.
          * Use security2_protocol == NULL as indicator.
          */
-        uefi_call_wrapper(BS->LocateProtocol, 3, (EFI_GUID*) &security2_protocol_guid, NULL, (VOID**) &security2_protocol);
+        uefi_call_wrapper(BS->LocateProtocol, 3, SECURITY_PROTOCOL2_GUID, NULL, (VOID**) &security2_protocol);
 
-        status = uefi_call_wrapper(BS->LocateProtocol, 3, (EFI_GUID*) &security_protocol_guid, NULL, (VOID**) &security_protocol);
+        status = uefi_call_wrapper(BS->LocateProtocol, 3, SECURITY_PROTOCOL_GUID, NULL, (VOID**) &security_protocol);
          /* This one is mandatory, so there's a serious problem */
         if (status != EFI_SUCCESS)
                 return status;
diff --git a/src/boot/efi/shim.h b/src/boot/efi/shim.h
index e24fcdac54..d682994b9e 100644
--- a/src/boot/efi/shim.h
+++ b/src/boot/efi/shim.h
@@ -13,6 +13,4 @@
 
 BOOLEAN shim_loaded(void);
 
-BOOLEAN secure_boot_enabled(void);
-
 EFI_STATUS security_policy_install(void);
diff --git a/src/boot/efi/splash.c b/src/boot/efi/splash.c
index 552c45cff4..5e085ec45c 100644
--- a/src/boot/efi/splash.c
+++ b/src/boot/efi/splash.c
@@ -151,22 +151,18 @@ static EFI_STATUS bmp_to_blt(EFI_GRAPHICS_OUTPUT_BLT_PIXEL *buf,
                       struct bmp_dib *dib, struct bmp_map *map,
                       UINT8 *pixmap) {
         UINT8 *in;
-        UINTN y;
 
         /* transform and copy pixels */
         in = pixmap;
-        for (y = 0; y < dib->y; y++) {
+        for (UINTN y = 0; y < dib->y; y++) {
                 EFI_GRAPHICS_OUTPUT_BLT_PIXEL *out;
                 UINTN row_size;
-                UINTN x;
 
                 out = &buf[(dib->y - y - 1) * dib->x];
-                for (x = 0; x < dib->x; x++, in++, out++) {
+                for (UINTN x = 0; x < dib->x; x++, in++, out++) {
                         switch (dib->depth) {
                         case 1: {
-                                UINTN i;
-
-                                for (i = 0; i < 8 && x < dib->x; i++) {
+                                for (UINTN i = 0; i < 8 && x < dib->x; i++) {
                                         out->Red = map[((*in) >> (7 - i)) & 1].red;
                                         out->Green = map[((*in) >> (7 - i)) & 1].green;
                                         out->Blue = map[((*in) >> (7 - i)) & 1].blue;
diff --git a/src/boot/efi/stub.c b/src/boot/efi/stub.c
index a09f47c711..0bef6b1c44 100644
--- a/src/boot/efi/stub.c
+++ b/src/boot/efi/stub.c
@@ -8,19 +8,15 @@
 #include "linux.h"
 #include "measure.h"
 #include "pe.h"
+#include "secure-boot.h"
 #include "splash.h"
 #include "util.h"
 
 /* magic string to find in the binary image */
 static const char __attribute__((used)) magic[] = "#### LoaderInfo: systemd-stub " GIT_VERSION " ####";
 
-static const EFI_GUID global_guid = EFI_GLOBAL_VARIABLE;
-
 EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
         EFI_LOADED_IMAGE *loaded_image;
-        _cleanup_freepool_ CHAR8 *b = NULL;
-        UINTN size;
-        BOOLEAN secure = FALSE;
         CHAR8 *sections[] = {
                 (CHAR8 *)".cmdline",
                 (CHAR8 *)".linux",
@@ -46,10 +42,6 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
                 return err;
         }
 
-        if (efivar_get_raw(&global_guid, L"SecureBoot", &b, &size) == EFI_SUCCESS)
-                if (*b > 0)
-                        secure = TRUE;
-
         err = pe_memory_locate_sections(loaded_image->ImageBase, sections, addrs, offs, szs);
         if (EFI_ERROR(err)) {
                 Print(L"Unable to locate embedded .linux section: %r ", err);
@@ -58,20 +50,20 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
         }
 
         if (szs[0] > 0)
-                cmdline = (CHAR8 *)(loaded_image->ImageBase + addrs[0]);
+                cmdline = (CHAR8 *)(loaded_image->ImageBase) + addrs[0];
 
         cmdline_len = szs[0];
 
         /* if we are not in secure boot mode, or none was provided, accept a custom command line and replace the built-in one */
-        if ((!secure || cmdline_len == 0) && loaded_image->LoadOptionsSize > 0 && *(CHAR16 *)loaded_image->LoadOptions > 0x1F) {
+        if ((!secure_boot_enabled() || cmdline_len == 0) && loaded_image->LoadOptionsSize > 0 &&
+            *(CHAR16 *) loaded_image->LoadOptions > 0x1F) {
                 CHAR16 *options;
                 CHAR8 *line;
-                UINTN i;
 
                 options = (CHAR16 *)loaded_image->LoadOptions;
                 cmdline_len = (loaded_image->LoadOptionsSize / sizeof(CHAR16)) * sizeof(CHAR8);
                 line = AllocatePool(cmdline_len);
-                for (i = 0; i < cmdline_len; i++)
+                for (UINTN i = 0; i < cmdline_len; i++)
                         line[i] = options[i];
                 cmdline = line;
 
@@ -88,37 +80,37 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
         }
 
         /* Export the device path this image is started from, if it's not set yet */
-        if (efivar_get_raw(&loader_guid, L"LoaderDevicePartUUID", NULL, NULL) != EFI_SUCCESS)
+        if (efivar_get_raw(LOADER_GUID, L"LoaderDevicePartUUID", NULL, NULL) != EFI_SUCCESS)
                 if (disk_get_part_uuid(loaded_image->DeviceHandle, uuid) == EFI_SUCCESS)
-                        efivar_set(L"LoaderDevicePartUUID", uuid, FALSE);
+                        efivar_set(LOADER_GUID, L"LoaderDevicePartUUID", uuid, FALSE);
 
         /* if LoaderImageIdentifier is not set, assume the image with this stub was loaded directly from UEFI */
-        if (efivar_get_raw(&loader_guid, L"LoaderImageIdentifier", NULL, NULL) != EFI_SUCCESS) {
+        if (efivar_get_raw(LOADER_GUID, L"LoaderImageIdentifier", NULL, NULL) != EFI_SUCCESS) {
                 _cleanup_freepool_ CHAR16 *s;
 
                 s = DevicePathToStr(loaded_image->FilePath);
-                efivar_set(L"LoaderImageIdentifier", s, FALSE);
+                efivar_set(LOADER_GUID, L"LoaderImageIdentifier", s, FALSE);
         }
 
         /* if LoaderFirmwareInfo is not set, let's set it */
-        if (efivar_get_raw(&loader_guid, L"LoaderFirmwareInfo", NULL, NULL) != EFI_SUCCESS) {
+        if (efivar_get_raw(LOADER_GUID, L"LoaderFirmwareInfo", NULL, NULL) != EFI_SUCCESS) {
                 _cleanup_freepool_ CHAR16 *s;
 
                 s = PoolPrint(L"%s %d.%02d", ST->FirmwareVendor, ST->FirmwareRevision >> 16, ST->FirmwareRevision & 0xffff);
-                efivar_set(L"LoaderFirmwareInfo", s, FALSE);
+                efivar_set(LOADER_GUID, L"LoaderFirmwareInfo", s, FALSE);
         }
 
         /* ditto for LoaderFirmwareType */
-        if (efivar_get_raw(&loader_guid, L"LoaderFirmwareType", NULL, NULL) != EFI_SUCCESS) {
+        if (efivar_get_raw(LOADER_GUID, L"LoaderFirmwareType", NULL, NULL) != EFI_SUCCESS) {
                 _cleanup_freepool_ CHAR16 *s;
 
                 s = PoolPrint(L"UEFI %d.%02d", ST->Hdr.Revision >> 16, ST->Hdr.Revision & 0xffff);
-                efivar_set(L"LoaderFirmwareType", s, FALSE);
+                efivar_set(LOADER_GUID, L"LoaderFirmwareType", s, FALSE);
         }
 
         /* add StubInfo */
-        if (efivar_get_raw(&loader_guid, L"StubInfo", NULL, NULL) != EFI_SUCCESS)
-                efivar_set(L"StubInfo", L"systemd-stub " GIT_VERSION, FALSE);
+        if (efivar_get_raw(LOADER_GUID, L"StubInfo", NULL, NULL) != EFI_SUCCESS)
+                efivar_set(LOADER_GUID, L"StubInfo", L"systemd-stub " GIT_VERSION, FALSE);
 
         if (szs[3] > 0)
                 graphics_splash((UINT8 *)((UINTN)loaded_image->ImageBase + addrs[3]), szs[3], NULL);
diff --git a/src/boot/efi/util.c b/src/boot/efi/util.c
index 2712c2d3f0..8adf3f5fe4 100644
--- a/src/boot/efi/util.c
+++ b/src/boot/efi/util.c
@@ -5,13 +5,6 @@
 
 #include "util.h"
 
-/*
- * Allocated random UUID, intended to be shared across tools that implement
- * the (ESP)\loader\entries\<vendor>-<revision>.conf convention and the
- * associated EFI variables.
- */
-const EFI_GUID loader_guid = { 0x4a67b082, 0x0a4c, 0x41cf, {0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f} };
-
 #ifdef __x86_64__
 UINT64 ticks_read(VOID) {
         UINT64 a, d;
@@ -92,24 +85,51 @@ EFI_STATUS efivar_set_raw(const EFI_GUID *vendor, const CHAR16 *name, const VOID
         return uefi_call_wrapper(RT->SetVariable, 5, (CHAR16*) name, (EFI_GUID *)vendor, flags, size, (VOID*) buf);
 }
 
-EFI_STATUS efivar_set(const CHAR16 *name, const CHAR16 *value, BOOLEAN persistent) {
-        return efivar_set_raw(&loader_guid, name, value, value ? (StrLen(value)+1) * sizeof(CHAR16) : 0, persistent);
+EFI_STATUS efivar_set(const EFI_GUID *vendor, const CHAR16 *name, const CHAR16 *value, BOOLEAN persistent) {
+        return efivar_set_raw(
+                vendor, name, value, value ? (StrLen(value) + 1) * sizeof(CHAR16) : 0, persistent);
 }
 
-EFI_STATUS efivar_set_int(CHAR16 *name, UINTN i, BOOLEAN persistent) {
+EFI_STATUS efivar_set_uint_string(const EFI_GUID *vendor, CHAR16 *name, UINTN i, BOOLEAN persistent) {
         CHAR16 str[32];
 
         SPrint(str, 32, L"%u", i);
-        return efivar_set(name, str, persistent);
+        return efivar_set(vendor, name, str, persistent);
+}
+
+EFI_STATUS efivar_set_uint32_le(const EFI_GUID *vendor, CHAR16 *name, UINT32 value, BOOLEAN persistent) {
+        UINT8 buf[4];
+
+        buf[0] = (UINT8)(value >> 0U & 0xFF);
+        buf[1] = (UINT8)(value >> 8U & 0xFF);
+        buf[2] = (UINT8)(value >> 16U & 0xFF);
+        buf[3] = (UINT8)(value >> 24U & 0xFF);
+
+        return efivar_set_raw(vendor, name, buf, sizeof(buf), persistent);
+}
+
+EFI_STATUS efivar_set_uint64_le(const EFI_GUID *vendor, CHAR16 *name, UINT64 value, BOOLEAN persistent) {
+        UINT8 buf[8];
+
+        buf[0] = (UINT8)(value >> 0U & 0xFF);
+        buf[1] = (UINT8)(value >> 8U & 0xFF);
+        buf[2] = (UINT8)(value >> 16U & 0xFF);
+        buf[3] = (UINT8)(value >> 24U & 0xFF);
+        buf[4] = (UINT8)(value >> 32U & 0xFF);
+        buf[5] = (UINT8)(value >> 40U & 0xFF);
+        buf[6] = (UINT8)(value >> 48U & 0xFF);
+        buf[7] = (UINT8)(value >> 56U & 0xFF);
+
+        return efivar_set_raw(vendor, name, buf, sizeof(buf), persistent);
 }
 
-EFI_STATUS efivar_get(const CHAR16 *name, CHAR16 **value) {
+EFI_STATUS efivar_get(const EFI_GUID *vendor, const CHAR16 *name, CHAR16 **value) {
         _cleanup_freepool_ CHAR8 *buf = NULL;
         EFI_STATUS err;
         CHAR16 *val;
         UINTN size;
 
-        err = efivar_get_raw(&loader_guid, name, &buf, &size);
+        err = efivar_get_raw(vendor, name, &buf, &size);
         if (EFI_ERROR(err))
                 return err;
 
@@ -138,17 +158,52 @@ EFI_STATUS efivar_get(const CHAR16 *name, CHAR16 **value) {
         return EFI_SUCCESS;
 }
 
-EFI_STATUS efivar_get_int(const CHAR16 *name, UINTN *i) {
+EFI_STATUS efivar_get_uint_string(const EFI_GUID *vendor, const CHAR16 *name, UINTN *i) {
         _cleanup_freepool_ CHAR16 *val = NULL;
         EFI_STATUS err;
 
-        err = efivar_get(name, &val);
+        err = efivar_get(vendor, name, &val);
         if (!EFI_ERROR(err) && i)
                 *i = Atoi(val);
 
         return err;
 }
 
+EFI_STATUS efivar_get_uint32_le(const EFI_GUID *vendor, const CHAR16 *name, UINT32 *ret) {
+        _cleanup_freepool_ CHAR8 *buf = NULL;
+        UINTN size;
+        EFI_STATUS err;
+
+        err = efivar_get_raw(vendor, name, &buf, &size);
+        if (!EFI_ERROR(err) && ret) {
+                if (size != sizeof(UINT32))
+                        return EFI_BUFFER_TOO_SMALL;
+
+                *ret = (UINT32) buf[0] << 0U | (UINT32) buf[1] << 8U | (UINT32) buf[2] << 16U |
+                        (UINT32) buf[3] << 24U;
+        }
+
+        return err;
+}
+
+EFI_STATUS efivar_get_uint64_le(const EFI_GUID *vendor, const CHAR16 *name, UINT64 *ret) {
+        _cleanup_freepool_ CHAR8 *buf = NULL;
+        UINTN size;
+        EFI_STATUS err;
+
+        err = efivar_get_raw(vendor, name, &buf, &size);
+        if (!EFI_ERROR(err) && ret) {
+                if (size != sizeof(UINT64))
+                        return EFI_BUFFER_TOO_SMALL;
+
+                *ret = (UINT64) buf[0] << 0U | (UINT64) buf[1] << 8U | (UINT64) buf[2] << 16U |
+                        (UINT64) buf[3] << 24U | (UINT64) buf[4] << 32U | (UINT64) buf[5] << 40U |
+                        (UINT64) buf[6] << 48U | (UINT64) buf[7] << 56U;
+        }
+
+        return err;
+}
+
 EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const CHAR16 *name, CHAR8 **buffer, UINTN *size) {
         _cleanup_freepool_ CHAR8 *buf = NULL;
         UINTN l;
@@ -172,7 +227,19 @@ EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const CHAR16 *name, CHAR8 **bu
         return err;
 }
 
-VOID efivar_set_time_usec(CHAR16 *name, UINT64 usec) {
+EFI_STATUS efivar_get_boolean_u8(const EFI_GUID *vendor, const CHAR16 *name, BOOLEAN *ret) {
+        _cleanup_freepool_ CHAR8 *b = NULL;
+        UINTN size;
+        EFI_STATUS err;
+
+        err = efivar_get_raw(vendor, name, &b, &size);
+        if (!EFI_ERROR(err))
+                *ret = *b > 0;
+
+        return err;
+}
+
+VOID efivar_set_time_usec(const EFI_GUID *vendor, CHAR16 *name, UINT64 usec) {
         CHAR16 str[32];
 
         if (usec == 0)
@@ -181,13 +248,12 @@ VOID efivar_set_time_usec(CHAR16 *name, UINT64 usec) {
                 return;
 
         SPrint(str, 32, L"%ld", usec);
-        efivar_set(name, str, FALSE);
+        efivar_set(vendor, name, str, FALSE);
 }
 
 static INTN utf8_to_16(CHAR8 *stra, CHAR16 *c) {
         CHAR16 unichar;
         UINTN len;
-        UINTN i;
 
         if (!(stra[0] & 0x80))
                 len = 1;
@@ -225,7 +291,7 @@ static INTN utf8_to_16(CHAR8 *stra, CHAR16 *c) {
                 break;
         }
 
-        for (i = 1; i < len; i++) {
+        for (UINTN i = 1; i < len; i++) {
                 if ((stra[i] & 0xc0) != 0x80)
                         return -1;
                 unichar <<= 6;
@@ -309,6 +375,62 @@ CHAR8 *strchra(CHAR8 *s, CHAR8 c) {
         return NULL;
 }
 
+const CHAR16 *startswith(const CHAR16 *s, const CHAR16 *prefix) {
+        UINTN l;
+
+        l = StrLen(prefix);
+        if (StrnCmp(s, prefix, l) == 0)
+                return s + l;
+
+        return NULL;
+}
+
+const CHAR16 *endswith(const CHAR16 *s, const CHAR16 *postfix) {
+        UINTN sl, pl;
+
+        sl = StrLen(s);
+        pl = StrLen(postfix);
+
+        if (pl == 0)
+                return s + sl;
+
+        if (sl < pl)
+                return NULL;
+
+        if (StrnCmp(s + sl - pl, postfix, pl) != 0)
+                return NULL;
+
+        return s + sl - pl;
+}
+
+const CHAR16 *startswith_no_case(const CHAR16 *s, const CHAR16 *prefix) {
+        UINTN l;
+
+        l = StrLen(prefix);
+        if (StriCmp(s, prefix) == 0)
+                return s + l;
+
+        return NULL;
+}
+
+const CHAR16 *endswith_no_case(const CHAR16 *s, const CHAR16 *postfix) {
+        UINTN sl, pl;
+
+        sl = StrLen(s);
+        pl = StrLen(postfix);
+
+        if (pl == 0)
+                return s + sl;
+
+        if (sl < pl)
+                return NULL;
+
+        if (StriCmp(s + sl - pl, postfix) != 0)
+                return NULL;
+
+        return s + sl - pl;
+}
+
 EFI_STATUS file_read(EFI_FILE_HANDLE dir, const CHAR16 *name, UINTN off, UINTN size, CHAR8 **ret, UINTN *ret_size) {
         _cleanup_(FileHandleClosep) EFI_FILE_HANDLE handle = NULL;
         _cleanup_freepool_ CHAR8 *buf = NULL;
diff --git a/src/boot/efi/util.h b/src/boot/efi/util.h
index 916519cdf8..f2be857d42 100644
--- a/src/boot/efi/util.h
+++ b/src/boot/efi/util.h
@@ -21,19 +21,30 @@ UINT64 ticks_read(void);
 UINT64 ticks_freq(void);
 UINT64 time_usec(void);
 
-EFI_STATUS efivar_set(const CHAR16 *name, const CHAR16 *value, BOOLEAN persistent);
+EFI_STATUS efivar_set(const EFI_GUID *vendor, const CHAR16 *name, const CHAR16 *value, BOOLEAN persistent);
 EFI_STATUS efivar_set_raw(const EFI_GUID *vendor, const CHAR16 *name, const VOID *buf, UINTN size, BOOLEAN persistent);
-EFI_STATUS efivar_set_int(CHAR16 *name, UINTN i, BOOLEAN persistent);
-VOID efivar_set_time_usec(CHAR16 *name, UINT64 usec);
+EFI_STATUS efivar_set_uint_string(const EFI_GUID *vendor, CHAR16 *name, UINTN i, BOOLEAN persistent);
+EFI_STATUS efivar_set_uint32_le(const EFI_GUID *vendor, CHAR16 *NAME, UINT32 value, BOOLEAN persistent);
+EFI_STATUS efivar_set_uint64_le(const EFI_GUID *vendor, CHAR16 *name, UINT64 value, BOOLEAN persistent);
+VOID efivar_set_time_usec(const EFI_GUID *vendor, CHAR16 *name, UINT64 usec);
 
-EFI_STATUS efivar_get(const CHAR16 *name, CHAR16 **value);
+EFI_STATUS efivar_get(const EFI_GUID *vendor, const CHAR16 *name, CHAR16 **value);
 EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const CHAR16 *name, CHAR8 **buffer, UINTN *size);
-EFI_STATUS efivar_get_int(const CHAR16 *name, UINTN *i);
+EFI_STATUS efivar_get_uint_string(const EFI_GUID *vendor, const CHAR16 *name, UINTN *i);
+EFI_STATUS efivar_get_uint32_le(const EFI_GUID *vendor, const CHAR16 *name, UINT32 *ret);
+EFI_STATUS efivar_get_uint64_le(const EFI_GUID *vendor, const CHAR16 *name, UINT64 *ret);
+EFI_STATUS efivar_get_boolean_u8(const EFI_GUID *vendor, const CHAR16 *name, BOOLEAN *ret);
 
 CHAR8 *strchra(CHAR8 *s, CHAR8 c);
 CHAR16 *stra_to_path(CHAR8 *stra);
 CHAR16 *stra_to_str(CHAR8 *stra);
 
+const CHAR16 *startswith(const CHAR16 *s, const CHAR16 *prefix);
+const CHAR16 *endswith(const CHAR16 *s, const CHAR16 *postfix);
+
+const CHAR16 *startswith_no_case(const CHAR16 *s, const CHAR16 *prefix);
+const CHAR16 *endswith_no_case(const CHAR16 *s, const CHAR16 *postfix);
+
 EFI_STATUS file_read(EFI_FILE_HANDLE dir, const CHAR16 *name, UINTN off, UINTN size, CHAR8 **content, UINTN *content_size);
 
 static inline void FreePoolp(void *p) {
@@ -55,7 +66,14 @@ static inline void FileHandleClosep(EFI_FILE_HANDLE *handle) {
         uefi_call_wrapper((*handle)->Close, 1, *handle);
 }
 
-extern const EFI_GUID loader_guid;
+/*
+ * Allocated random UUID, intended to be shared across tools that implement
+ * the (ESP)\loader\entries\<vendor>-<revision>.conf convention and the
+ * associated EFI variables.
+ */
+#define LOADER_GUID \
+        &(const EFI_GUID) { 0x4a67b082, 0x0a4c, 0x41cf, { 0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f } }
+#define EFI_GLOBAL_GUID &(const EFI_GUID) EFI_GLOBAL_VARIABLE
 
 #define UINTN_MAX (~(UINTN)0)
 #define INTN_MAX ((INTN)(UINTN_MAX>>1))