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-rw-r--r--src/boot/efi/console.c227
1 files changed, 227 insertions, 0 deletions
diff --git a/src/boot/efi/console.c b/src/boot/efi/console.c
new file mode 100644
index 0000000..2dd4543
--- /dev/null
+++ b/src/boot/efi/console.c
@@ -0,0 +1,227 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <efi.h>
+#include <efilib.h>
+
+#include "console.h"
+#include "util.h"
+
+#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 } }
+
+struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL;
+
+typedef EFI_STATUS (EFIAPI *EFI_INPUT_RESET_EX)(
+ struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
+ BOOLEAN ExtendedVerification
+);
+
+typedef UINT8 EFI_KEY_TOGGLE_STATE;
+
+typedef struct {
+ UINT32 KeyShiftState;
+ EFI_KEY_TOGGLE_STATE KeyToggleState;
+} EFI_KEY_STATE;
+
+typedef struct {
+ EFI_INPUT_KEY Key;
+ EFI_KEY_STATE KeyState;
+} EFI_KEY_DATA;
+
+typedef EFI_STATUS (EFIAPI *EFI_INPUT_READ_KEY_EX)(
+ struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
+ EFI_KEY_DATA *KeyData
+);
+
+typedef EFI_STATUS (EFIAPI *EFI_SET_STATE)(
+ struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
+ EFI_KEY_TOGGLE_STATE *KeyToggleState
+);
+
+typedef EFI_STATUS (EFIAPI *EFI_KEY_NOTIFY_FUNCTION)(
+ EFI_KEY_DATA *KeyData
+);
+
+typedef EFI_STATUS (EFIAPI *EFI_REGISTER_KEYSTROKE_NOTIFY)(
+ struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
+ EFI_KEY_DATA KeyData,
+ EFI_KEY_NOTIFY_FUNCTION KeyNotificationFunction,
+ VOID **NotifyHandle
+);
+
+typedef EFI_STATUS (EFIAPI *EFI_UNREGISTER_KEYSTROKE_NOTIFY)(
+ struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
+ VOID *NotificationHandle
+);
+
+typedef struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL {
+ EFI_INPUT_RESET_EX Reset;
+ EFI_INPUT_READ_KEY_EX ReadKeyStrokeEx;
+ EFI_EVENT WaitForKeyEx;
+ EFI_SET_STATE SetState;
+ EFI_REGISTER_KEYSTROKE_NOTIFY RegisterKeyNotify;
+ EFI_UNREGISTER_KEYSTROKE_NOTIFY UnregisterKeyNotify;
+} 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;
+ EFI_INPUT_KEY k;
+ EFI_STATUS err;
+
+ if (!checked) {
+ err = LibLocateProtocol(&EfiSimpleTextInputExProtocolGuid, (VOID **)&TextInputEx);
+ if (EFI_ERROR(err))
+ TextInputEx = NULL;
+
+ checked = TRUE;
+ }
+
+ /* wait until key is pressed */
+ if (wait)
+ uefi_call_wrapper(BS->WaitForEvent, 3, 1, &ST->ConIn->WaitForKey, &index);
+
+ if (TextInputEx) {
+ EFI_KEY_DATA keydata;
+ UINT64 keypress;
+
+ 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;
+ }
+ }
+ }
+
+ /* 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;
+}
+
+static EFI_STATUS change_mode(UINTN mode) {
+ EFI_STATUS err;
+
+ err = uefi_call_wrapper(ST->ConOut->SetMode, 2, ST->ConOut, mode);
+
+ /* Special case mode 1: when using OVMF and qemu, setting it returns error
+ * and breaks console output. */
+ if (EFI_ERROR(err) && mode == 1)
+ uefi_call_wrapper(ST->ConOut->SetMode, 2, ST->ConOut, (UINTN)0);
+
+ return err;
+}
+
+static UINT64 text_area_from_font_size(void) {
+ EFI_STATUS err;
+ UINT64 text_area;
+ UINTN rows, columns;
+
+ err = uefi_call_wrapper(ST->ConOut->QueryMode, 4, ST->ConOut, ST->ConOut->Mode->Mode, &columns, &rows);
+ if (EFI_ERROR(err)) {
+ columns = 80;
+ rows = 25;
+ }
+
+ text_area = SYSTEM_FONT_WIDTH * SYSTEM_FONT_HEIGHT * (UINT64)rows * (UINT64)columns;
+
+ return text_area;
+}
+
+static EFI_STATUS mode_auto(UINTN *mode) {
+ const UINT32 HORIZONTAL_MAX_OK = 1920;
+ const UINT32 VERTICAL_MAX_OK = 1080;
+ const UINT64 VIEWPORT_RATIO = 10;
+ UINT64 screen_area, text_area;
+ EFI_GUID GraphicsOutputProtocolGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
+ EFI_GRAPHICS_OUTPUT_PROTOCOL *GraphicsOutput;
+ EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *Info;
+ EFI_STATUS err;
+ BOOLEAN keep = FALSE;
+
+ err = LibLocateProtocol(&GraphicsOutputProtocolGuid, (VOID **)&GraphicsOutput);
+ if (!EFI_ERROR(err) && GraphicsOutput->Mode && GraphicsOutput->Mode->Info) {
+ Info = GraphicsOutput->Mode->Info;
+
+ /* Start verifying if we are in a resolution larger than Full HD
+ * (1920x1080). If we're not, assume we're in a good mode and do not
+ * try to change it. */
+ if (Info->HorizontalResolution <= HORIZONTAL_MAX_OK && Info->VerticalResolution <= VERTICAL_MAX_OK)
+ keep = TRUE;
+ /* For larger resolutions, calculate the ratio of the total screen
+ * area to the text viewport area. If it's less than 10 times bigger,
+ * then assume the text is readable and keep the text mode. */
+ else {
+ screen_area = (UINT64)Info->HorizontalResolution * (UINT64)Info->VerticalResolution;
+ text_area = text_area_from_font_size();
+
+ if (text_area != 0 && screen_area/text_area < VIEWPORT_RATIO)
+ keep = TRUE;
+ }
+ }
+
+ if (keep) {
+ /* Just clear the screen instead of changing the mode and return. */
+ *mode = ST->ConOut->Mode->Mode;
+ uefi_call_wrapper(ST->ConOut->ClearScreen, 1, ST->ConOut);
+ return EFI_SUCCESS;
+ }
+
+ /* If we reached here, then we have a high resolution screen and the text
+ * viewport is less than 10% the screen area, so the firmware developer
+ * screwed up. Try to switch to a better mode. Mode number 2 is first non
+ * standard mode, which is provided by the device manufacturer, so it should
+ * be a good mode.
+ * Note: MaxMode is the number of modes, not the last mode. */
+ if (ST->ConOut->Mode->MaxMode > 2)
+ *mode = 2;
+ /* Try again with mode different than zero (assume user requests
+ * auto mode due to some problem with mode zero). */
+ else if (ST->ConOut->Mode->MaxMode == 2)
+ *mode = 1;
+ /* Else force mode change to zero. */
+ else
+ *mode = 0;
+
+ return change_mode(*mode);
+}
+
+EFI_STATUS console_set_mode(UINTN *mode, enum console_mode_change_type how) {
+ if (how == CONSOLE_MODE_AUTO)
+ return mode_auto(mode);
+
+ if (how == CONSOLE_MODE_MAX) {
+ /* Note: MaxMode is the number of modes, not the last mode. */
+ if (ST->ConOut->Mode->MaxMode > 0)
+ *mode = ST->ConOut->Mode->MaxMode-1;
+ else
+ *mode = 0;
+ }
+
+ return change_mode(*mode);
+}
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