summaryrefslogtreecommitdiff
path: root/src/grp-boot/systemd-boot/console.c
blob: 2b797c9a5f0813d3a2d512c226f95d7ff73600a5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * Copyright (C) 2012-2013 Kay Sievers <kay@vrfy.org>
 * Copyright (C) 2012 Harald Hoyer <harald@redhat.com>
 */

#include <efi.h>
#include <efilib.h>

#include "console.h"
#include "util.h"

#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 acually
         * 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;
}