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1682f0b760
SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
148 lines
3.2 KiB
C++
148 lines
3.2 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/Types.h>
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#include <Kernel/Console.h>
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#include <Kernel/IO.h>
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#include <Kernel/Process.h>
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#include <Kernel/SpinLock.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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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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if (ch == '\r')
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was_cr = true;
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else
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was_cr = false;
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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 Console()::the() and do a stack overflow
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if (Console::is_initialized()) {
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Console::the().put_char(ch);
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} else {
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IO::out8(0xe9, 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 void debugger_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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IO::out8(0xe9, 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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ScopedSpinLock lock(s_log_lock);
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for (size_t i = 0; i < length; ++i)
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debugger_out(characters[i]);
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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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ScopedSpinLock 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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