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From 9e47ea7c98d1f4e0a75edb5d1590e5742f253317 Mon Sep 17 00:00:00 2001
From: Jan Janssen <medhefgo@web.de>
Date: Wed, 11 Aug 2021 14:59:46 +0200
Subject: [PATCH] sd-boot: Rework console input handling
Fixes: #15847
Probably fixes: #19191
(cherry picked from commit e98d271e57f3d0356e444b6ea2d48836ee2769b0)
Conflict:NA
Reference:https://github.com/systemd/systemd/commit/9e47ea7c98d1f4e0a75edb5d1590e5742f253317
---
src/boot/efi/boot.c | 55 +++++++---------------
src/boot/efi/console.c | 102 +++++++++++++++++++++++++++++------------
src/boot/efi/console.h | 2 +-
3 files changed, 91 insertions(+), 68 deletions(-)
diff --git a/src/boot/efi/boot.c b/src/boot/efi/boot.c
index 54d704f0d1..b4f3b9605a 100644
--- a/src/boot/efi/boot.c
+++ b/src/boot/efi/boot.c
@@ -134,7 +134,7 @@ static BOOLEAN line_edit(
uefi_call_wrapper(ST->ConOut->OutputString, 2, ST->ConOut, print);
uefi_call_wrapper(ST->ConOut->SetCursorPosition, 3, ST->ConOut, cursor, y_pos);
- err = console_key_read(&key, TRUE);
+ err = console_key_read(&key, 0);
if (EFI_ERROR(err))
continue;
@@ -387,7 +387,7 @@ static VOID print_status(Config *config, CHAR16 *loaded_image_path) {
Print(L"OsIndicationsSupported: %d\n", indvar);
Print(L"\n--- press key ---\n\n");
- console_key_read(&key, TRUE);
+ console_key_read(&key, 0);
Print(L"timeout: %u\n", config->timeout_sec);
if (config->timeout_sec_efivar >= 0)
@@ -432,7 +432,7 @@ static VOID print_status(Config *config, CHAR16 *loaded_image_path) {
Print(L"LoaderEntryDefault: %s\n", defaultstr);
Print(L"\n--- press key ---\n\n");
- console_key_read(&key, TRUE);
+ console_key_read(&key, 0);
for (UINTN i = 0; i < config->entry_count; i++) {
ConfigEntry *entry;
@@ -482,7 +482,7 @@ static VOID print_status(Config *config, CHAR16 *loaded_image_path) {
entry->path, entry->next_name);
Print(L"\n--- press key ---\n\n");
- console_key_read(&key, TRUE);
+ console_key_read(&key, 0);
}
uefi_call_wrapper(ST->ConOut->ClearScreen, 1, ST->ConOut);
@@ -509,11 +509,10 @@ static BOOLEAN menu_run(
UINTN y_max;
CHAR16 *status;
CHAR16 *clearline;
- INTN timeout_remain;
+ UINTN timeout_remain = config->timeout_sec;
INT16 idx;
BOOLEAN exit = FALSE;
BOOLEAN run = TRUE;
- BOOLEAN wait = FALSE;
graphics_mode(FALSE);
uefi_call_wrapper(ST->ConIn->Reset, 2, ST->ConIn, FALSE);
@@ -538,12 +537,6 @@ static BOOLEAN menu_run(
y_max = 25;
}
- /* we check 10 times per second for a keystroke */
- if (config->timeout_sec > 0)
- timeout_remain = config->timeout_sec * 10;
- else
- timeout_remain = -1;
-
idx_highlight = config->idx_default;
idx_highlight_prev = 0;
@@ -643,7 +636,7 @@ static BOOLEAN menu_run(
if (timeout_remain > 0) {
FreePool(status);
- status = PoolPrint(L"Boot in %d sec.", (timeout_remain + 5) / 10);
+ status = PoolPrint(L"Boot in %d s.", timeout_remain);
}
/* print status at last line of screen */
@@ -664,27 +657,18 @@ static BOOLEAN menu_run(
uefi_call_wrapper(ST->ConOut->OutputString, 2, ST->ConOut, clearline+1 + x + len);
}
- err = console_key_read(&key, wait);
- if (EFI_ERROR(err)) {
- /* timeout reached */
+ err = console_key_read(&key, timeout_remain > 0 ? 1000 * 1000 : 0);
+ if (err == EFI_TIMEOUT) {
+ timeout_remain--;
if (timeout_remain == 0) {
exit = TRUE;
break;
}
- /* sleep and update status */
- if (timeout_remain > 0) {
- uefi_call_wrapper(BS->Stall, 1, 100 * 1000);
- timeout_remain--;
- continue;
- }
-
- /* timeout disabled, wait for next key */
- wait = TRUE;
+ /* update status */
continue;
- }
-
- timeout_remain = -1;
+ } else
+ timeout_remain = 0;
/* clear status after keystroke */
if (status) {
@@ -787,7 +771,7 @@ static BOOLEAN menu_run(
config->timeout_sec_efivar,
EFI_VARIABLE_NON_VOLATILE);
if (config->timeout_sec_efivar > 0)
- status = PoolPrint(L"Menu timeout set to %d sec.", config->timeout_sec_efivar);
+ status = PoolPrint(L"Menu timeout set to %d s.", 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){
@@ -795,7 +779,7 @@ static BOOLEAN menu_run(
efivar_set(
LOADER_GUID, L"LoaderConfigTimeout", NULL, EFI_VARIABLE_NON_VOLATILE);
if (config->timeout_sec_config > 0)
- status = PoolPrint(L"Menu timeout of %d sec is defined by configuration file.",
+ status = PoolPrint(L"Menu timeout of %d s is defined by configuration file.",
config->timeout_sec_config);
else
status = StrDuplicate(L"Menu disabled. Hold down key at bootup to show menu.");
@@ -813,7 +797,7 @@ static BOOLEAN menu_run(
config->timeout_sec_efivar,
EFI_VARIABLE_NON_VOLATILE);
if (config->timeout_sec_efivar > 0)
- status = PoolPrint(L"Menu timeout set to %d sec.",
+ status = PoolPrint(L"Menu timeout set to %d s.",
config->timeout_sec_efivar);
else
status = StrDuplicate(L"Menu disabled. Hold down key at bootup to show menu.");
@@ -2369,13 +2353,8 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
else {
UINT64 key;
- err = console_key_read(&key, FALSE);
-
- if (err == EFI_NOT_READY) {
- uefi_call_wrapper(BS->Stall, 1, 100 * 1000);
- err = console_key_read(&key, FALSE);
- }
-
+ /* Block up to 100ms to give firmware time to get input working. */
+ err = console_key_read(&key, 100 * 1000);
if (!EFI_ERROR(err)) {
INT16 idx;
diff --git a/src/boot/efi/console.c b/src/boot/efi/console.c
index 83619d2147..369c549daf 100644
--- a/src/boot/efi/console.c
+++ b/src/boot/efi/console.c
@@ -11,61 +11,105 @@
#define EFI_SIMPLE_TEXT_INPUT_EX_GUID &(EFI_GUID) EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL_GUID
-EFI_STATUS console_key_read(UINT64 *key, BOOLEAN wait) {
+static inline void EventClosep(EFI_EVENT *event) {
+ if (!*event)
+ return;
+
+ uefi_call_wrapper(BS->CloseEvent, 1, *event);
+}
+
+/*
+ * Reading input from the console sounds like an easy task to do, but thanks to broken
+ * firmware it is actually a nightmare.
+ *
+ * There is a ConIn and TextInputEx API for this. Ideally we want to use TextInputEx,
+ * because that gives us Ctrl/Alt/Shift key state information. Unfortunately, it is not
+ * always available and sometimes just non-functional.
+ *
+ * On the other hand we have ConIn, where some firmware likes to just freeze on us
+ * if we call ReadKeyStroke on it.
+ *
+ * Therefore, we use WaitForEvent on both ConIn and TextInputEx (if available) along
+ * with a timer event. The timer ensures there is no need to call into functions
+ * that might freeze on us, while still allowing us to show a timeout counter.
+ */
+EFI_STATUS console_key_read(UINT64 *key, UINT64 timeout_usec) {
static EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *TextInputEx;
static BOOLEAN checked;
UINTN index;
EFI_INPUT_KEY k;
EFI_STATUS err;
+ _cleanup_(EventClosep) EFI_EVENT timer = NULL;
+ EFI_EVENT events[3] = { ST->ConIn->WaitForKey };
+ UINTN n_events = 1;
if (!checked) {
err = LibLocateProtocol(EFI_SIMPLE_TEXT_INPUT_EX_GUID, (VOID **)&TextInputEx);
- if (EFI_ERROR(err))
+ if (EFI_ERROR(err) ||
+ uefi_call_wrapper(BS->CheckEvent, 1, TextInputEx->WaitForKeyEx) == EFI_INVALID_PARAMETER)
+ /* If WaitForKeyEx fails here, the firmware pretends it talks this
+ * protocol, but it really doesn't. */
TextInputEx = NULL;
+ else
+ events[n_events++] = TextInputEx->WaitForKeyEx;
checked = TRUE;
}
- /* wait until key is pressed */
- if (wait)
- uefi_call_wrapper(BS->WaitForEvent, 3, 1, &ST->ConIn->WaitForKey, &index);
+ if (timeout_usec > 0) {
+ err = uefi_call_wrapper(BS->CreateEvent, 5, EVT_TIMER, 0, NULL, NULL, &timer);
+ if (EFI_ERROR(err))
+ return log_error_status_stall(err, L"Error creating timer event: %r", err);
+
+ /* SetTimer expects 100ns units for some reason. */
+ err = uefi_call_wrapper(BS->SetTimer, 3, timer, TimerRelative, timeout_usec * 10);
+ if (EFI_ERROR(err))
+ return log_error_status_stall(err, L"Error arming timer event: %r", err);
- if (TextInputEx) {
+ events[n_events++] = timer;
+ }
+
+ err = uefi_call_wrapper(BS->WaitForEvent, 3, n_events, events, &index);
+ if (EFI_ERROR(err))
+ return log_error_status_stall(err, L"Error waiting for events: %r", err);
+
+ if (timeout_usec > 0 && timer == events[index])
+ return EFI_TIMEOUT;
+
+ /* TextInputEx might be ready too even if ConIn got to signal first. */
+ if (TextInputEx && !EFI_ERROR(uefi_call_wrapper(BS->CheckEvent, 1, TextInputEx->WaitForKeyEx))) {
EFI_KEY_DATA keydata;
UINT64 keypress;
+ UINT32 shift = 0;
err = uefi_call_wrapper(TextInputEx->ReadKeyStrokeEx, 2, TextInputEx, &keydata);
- if (!EFI_ERROR(err)) {
- UINT32 shift = 0;
-
- /* do not distinguish between left and right keys */
- if (keydata.KeyState.KeyShiftState & EFI_SHIFT_STATE_VALID) {
- if (keydata.KeyState.KeyShiftState & (EFI_RIGHT_CONTROL_PRESSED|EFI_LEFT_CONTROL_PRESSED))
- shift |= EFI_CONTROL_PRESSED;
- if (keydata.KeyState.KeyShiftState & (EFI_RIGHT_ALT_PRESSED|EFI_LEFT_ALT_PRESSED))
- shift |= EFI_ALT_PRESSED;
- };
-
- /* 32 bit modifier keys + 16 bit scan code + 16 bit unicode */
- keypress = KEYPRESS(shift, keydata.Key.ScanCode, keydata.Key.UnicodeChar);
- if (keypress > 0) {
- *key = keypress;
- return 0;
- }
+ if (EFI_ERROR(err))
+ return err;
+
+ /* do not distinguish between left and right keys */
+ if (keydata.KeyState.KeyShiftState & EFI_SHIFT_STATE_VALID) {
+ if (keydata.KeyState.KeyShiftState & (EFI_RIGHT_CONTROL_PRESSED|EFI_LEFT_CONTROL_PRESSED))
+ shift |= EFI_CONTROL_PRESSED;
+ if (keydata.KeyState.KeyShiftState & (EFI_RIGHT_ALT_PRESSED|EFI_LEFT_ALT_PRESSED))
+ shift |= EFI_ALT_PRESSED;
+ };
+
+ /* 32 bit modifier keys + 16 bit scan code + 16 bit unicode */
+ keypress = KEYPRESS(shift, keydata.Key.ScanCode, keydata.Key.UnicodeChar);
+ if (keypress > 0) {
+ *key = keypress;
+ return EFI_SUCCESS;
}
+
+ return EFI_NOT_READY;
}
- /* fallback for firmware which does not support SimpleTextInputExProtocol
- *
- * This is also called in case ReadKeyStrokeEx did not return a key, because
- * some broken firmwares offer SimpleTextInputExProtocol, but never actually
- * handle any key. */
err = uefi_call_wrapper(ST->ConIn->ReadKeyStroke, 2, ST->ConIn, &k);
if (EFI_ERROR(err))
return err;
*key = KEYPRESS(0, k.ScanCode, k.UnicodeChar);
- return 0;
+ return EFI_SUCCESS;
}
static EFI_STATUS change_mode(UINTN mode) {
diff --git a/src/boot/efi/console.h b/src/boot/efi/console.h
index 2c69af552a..23848a9c58 100644
--- a/src/boot/efi/console.h
+++ b/src/boot/efi/console.h
@@ -16,5 +16,5 @@ enum console_mode_change_type {
CONSOLE_MODE_MAX,
};
-EFI_STATUS console_key_read(UINT64 *key, BOOLEAN wait);
+EFI_STATUS console_key_read(UINT64 *key, UINT64 timeout_usec);
EFI_STATUS console_set_mode(UINTN *mode, enum console_mode_change_type how);
--
2.33.0
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