mirror of
https://github.com/SerenityOS/serenity
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194 lines
5.1 KiB
C++
194 lines
5.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/PrintfImplementation.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <Kernel/Arch/x86/IO.h>
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#include <Kernel/Devices/ConsoleDevice.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/PCISerialDevice.h>
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#include <Kernel/Graphics/GraphicsManagement.h>
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#include <Kernel/Locking/Spinlock.h>
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#include <Kernel/TTY/ConsoleManagement.h>
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#include <Kernel/kstdio.h>
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#include <LibC/stdarg.h>
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static bool serial_debug;
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// A recursive spinlock allows us to keep writing in the case where a
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// page fault happens in the middle of a dbgln(), etc
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static RecursiveSpinlock s_log_lock;
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void set_serial_debug(bool on_or_off)
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{
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serial_debug = on_or_off;
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}
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int get_serial_debug()
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{
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return serial_debug;
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}
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static void serial_putch(char ch)
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{
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if (PCISerialDevice::is_available())
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return PCISerialDevice::the().put_char(ch);
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static bool serial_ready = false;
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static bool was_cr = false;
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if (!serial_ready) {
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IO::out8(0x3F8 + 1, 0x00);
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IO::out8(0x3F8 + 3, 0x80);
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IO::out8(0x3F8 + 0, 0x02);
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IO::out8(0x3F8 + 1, 0x00);
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IO::out8(0x3F8 + 3, 0x03);
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IO::out8(0x3F8 + 2, 0xC7);
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IO::out8(0x3F8 + 4, 0x0B);
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serial_ready = true;
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}
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while ((IO::in8(0x3F8 + 5) & 0x20) == 0)
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;
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if (ch == '\n' && !was_cr)
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IO::out8(0x3F8, '\r');
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IO::out8(0x3F8, ch);
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was_cr = ch == '\r';
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}
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static void critical_console_out(char ch)
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{
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if (serial_debug)
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serial_putch(ch);
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// No need to output things to the real ConsoleDevice as no one is likely
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// to read it (because we are in a fatal situation, so only print things and halt)
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IO::out8(IO::BOCHS_DEBUG_PORT, ch);
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// We emit chars directly to the string. this is necessary in few cases,
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// especially when we want to avoid any memory allocations...
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if (GraphicsManagement::is_initialized() && GraphicsManagement::the().console()) {
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GraphicsManagement::the().console()->write(ch, true);
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}
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}
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static void console_out(char ch)
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{
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if (serial_debug)
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serial_putch(ch);
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// It would be bad to reach the assert in ConsoleDevice()::the() and do a stack overflow
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if (DeviceManagement::the().is_console_device_attached()) {
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DeviceManagement::the().console_device().put_char(ch);
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} else {
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IO::out8(IO::BOCHS_DEBUG_PORT, ch);
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}
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if (ConsoleManagement::is_initialized()) {
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ConsoleManagement::the().debug_tty()->emit_char(ch);
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}
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}
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static void buffer_putch(char*& bufptr, char ch)
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{
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*bufptr++ = ch;
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}
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// Declare it, so that the symbol is exported, because libstdc++ uses it.
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// However, *only* libstdc++ uses it, and none of the rest of the Kernel.
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extern "C" int sprintf(char* buffer, const char* fmt, ...);
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int sprintf(char* buffer, const char* fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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int ret = printf_internal(buffer_putch, buffer, fmt, ap);
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buffer[ret] = '\0';
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va_end(ap);
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return ret;
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}
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static size_t __vsnprintf_space_remaining;
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ALWAYS_INLINE void sized_buffer_putch(char*& bufptr, char ch)
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{
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if (__vsnprintf_space_remaining) {
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*bufptr++ = ch;
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--__vsnprintf_space_remaining;
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}
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}
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int snprintf(char* buffer, size_t size, const char* fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if (size) {
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__vsnprintf_space_remaining = size - 1;
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} else {
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__vsnprintf_space_remaining = 0;
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}
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int ret = printf_internal(sized_buffer_putch, buffer, fmt, ap);
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if (__vsnprintf_space_remaining) {
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buffer[ret] = '\0';
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} else if (size > 0) {
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buffer[size - 1] = '\0';
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}
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va_end(ap);
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return ret;
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}
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static inline void internal_dbgputch(char ch)
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{
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if (serial_debug)
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serial_putch(ch);
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IO::out8(IO::BOCHS_DEBUG_PORT, ch);
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}
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extern "C" void dbgputstr(const char* characters, size_t length)
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{
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if (!characters)
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return;
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SpinlockLocker lock(s_log_lock);
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for (size_t i = 0; i < length; ++i)
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internal_dbgputch(characters[i]);
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}
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void dbgputstr(StringView view)
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{
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::dbgputstr(view.characters_without_null_termination(), view.length());
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}
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extern "C" void kernelputstr(const char* characters, size_t length)
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{
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if (!characters)
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return;
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SpinlockLocker lock(s_log_lock);
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for (size_t i = 0; i < length; ++i)
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console_out(characters[i]);
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}
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extern "C" void kernelcriticalputstr(const char* characters, size_t length)
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{
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if (!characters)
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return;
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SpinlockLocker lock(s_log_lock);
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for (size_t i = 0; i < length; ++i)
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critical_console_out(characters[i]);
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}
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extern "C" void kernelearlyputstr(const char* characters, size_t length)
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{
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if (!characters)
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return;
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// NOTE: We do not lock the log lock here, as this function is called before this or any other processor was initialized, meaning:
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// A) The $gs base was not setup yet, so we cannot enter into critical sections, and as a result we cannot use SpinLocks
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// B) No other processors may try to print at the same time anyway
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for (size_t i = 0; i < length; ++i)
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internal_dbgputch(characters[i]);
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}
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