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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/PrintfImplementation.h>
#include <AK/Types.h>
#include <Kernel/Console.h>
#include <Kernel/IO.h>
#include <Kernel/Process.h>
#include <Kernel/SpinLock.h>
#include <Kernel/kstdio.h>
#include <LibC/stdarg.h>
static bool serial_debug;
// A recursive spinlock allows us to keep writing in the case where a
// page fault happens in the middle of a dbgln(), klog(), etc
static RecursiveSpinLock s_log_lock;
void set_serial_debug(bool on_or_off)
{
serial_debug = on_or_off;
}
int get_serial_debug()
{
return serial_debug;
}
static void serial_putch(char ch)
{
static bool serial_ready = false;
static bool was_cr = false;
if (!serial_ready) {
IO::out8(0x3F8 + 1, 0x00);
IO::out8(0x3F8 + 3, 0x80);
IO::out8(0x3F8 + 0, 0x02);
IO::out8(0x3F8 + 1, 0x00);
IO::out8(0x3F8 + 3, 0x03);
IO::out8(0x3F8 + 2, 0xC7);
IO::out8(0x3F8 + 4, 0x0B);
serial_ready = true;
}
while ((IO::in8(0x3F8 + 5) & 0x20) == 0)
;
if (ch == '\n' && !was_cr)
IO::out8(0x3F8, '\r');
IO::out8(0x3F8, ch);
if (ch == '\r')
was_cr = true;
else
was_cr = false;
}
static void console_out(char ch)
{
if (serial_debug)
serial_putch(ch);
// It would be bad to reach the assert in Console()::the() and do a stack overflow
if (Console::is_initialized()) {
Console::the().put_char(ch);
} else {
IO::out8(0xe9, ch);
}
}
static void buffer_putch(char*& bufptr, char ch)
{
*bufptr++ = ch;
}
// Declare it, so that the symbol is exported, because libstdc++ uses it.
// However, *only* libstdc++ uses it, and none of the rest of the Kernel.
extern "C" int sprintf(char* buffer, const char* fmt, ...);
int sprintf(char* buffer, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
int ret = printf_internal(buffer_putch, buffer, fmt, ap);
buffer[ret] = '\0';
va_end(ap);
return ret;
}
static size_t __vsnprintf_space_remaining;
ALWAYS_INLINE void sized_buffer_putch(char*& bufptr, char ch)
{
if (__vsnprintf_space_remaining) {
*bufptr++ = ch;
--__vsnprintf_space_remaining;
}
}
int snprintf(char* buffer, size_t size, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (size) {
__vsnprintf_space_remaining = size - 1;
} else {
__vsnprintf_space_remaining = 0;
}
int ret = printf_internal(sized_buffer_putch, buffer, fmt, ap);
if (__vsnprintf_space_remaining) {
buffer[ret] = '\0';
} else if (size > 0) {
buffer[size - 1] = '\0';
}
va_end(ap);
return ret;
}
static void debugger_out(char ch)
{
if (serial_debug)
serial_putch(ch);
IO::out8(0xe9, ch);
}
extern "C" int dbgputstr(const char* characters, int length)
{
if (!characters)
return 0;
ScopedSpinLock lock(s_log_lock);
for (int i = 0; i < length; ++i)
debugger_out(characters[i]);
return 0;
}
extern "C" int kernelputstr(const char* characters, int length)
{
if (!characters)
return 0;
ScopedSpinLock lock(s_log_lock);
for (int i = 0; i < length; ++i)
console_out(characters[i]);
return 0;
}
|
