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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/PrintfImplementation.h>
#include <AK/StringView.h>
#include <AK/Types.h>
#include <Kernel/Arch/DebugOutput.h>
#if ARCH(I386) || ARCH(X86_64)
# include <Kernel/Arch/x86/common/BochsDebugOutput.h>
#endif
#include <Kernel/Devices/ConsoleDevice.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Devices/PCISerialDevice.h>
#include <Kernel/Graphics/Console/BootFramebufferConsole.h>
#include <Kernel/Graphics/GraphicsManagement.h>
#include <Kernel/Locking/Spinlock.h>
#include <Kernel/TTY/ConsoleManagement.h>
#include <Kernel/kstdio.h>
#include <LibC/stdarg.h>
namespace Kernel {
extern Atomic<Graphics::Console*> g_boot_console;
}
static bool s_serial_debug_enabled;
// A recursive spinlock allows us to keep writing in the case where a
// page fault happens in the middle of a dbgln(), etc
static RecursiveSpinlock s_log_lock { LockRank::None };
void set_serial_debug_enabled(bool desired_state)
{
s_serial_debug_enabled = desired_state;
}
bool is_serial_debug_enabled()
{
return s_serial_debug_enabled;
}
static void serial_putch(char ch)
{
if (PCISerialDevice::is_available())
return PCISerialDevice::the().put_char(ch);
debug_output(ch);
}
static void critical_console_out(char ch)
{
if (s_serial_debug_enabled)
serial_putch(ch);
#if ARCH(I386) || ARCH(X86_64)
// No need to output things to the real ConsoleDevice as no one is likely
// to read it (because we are in a fatal situation, so only print things and halt)
bochs_debug_output(ch);
#endif
// We emit chars directly to the string. this is necessary in few cases,
// especially when we want to avoid any memory allocations...
if (GraphicsManagement::is_initialized() && GraphicsManagement::the().console()) {
GraphicsManagement::the().console()->write(ch, true);
} else if (auto* boot_console = g_boot_console.load()) {
boot_console->write(ch, true);
}
}
static void console_out(char ch)
{
if (s_serial_debug_enabled)
serial_putch(ch);
// It would be bad to reach the assert in ConsoleDevice()::the() and do a stack overflow
if (DeviceManagement::the().is_console_device_attached()) {
DeviceManagement::the().console_device().put_char(ch);
} else {
#if ARCH(I386) || ARCH(X86_64)
bochs_debug_output(ch);
#endif
}
if (ConsoleManagement::is_initialized()) {
ConsoleManagement::the().debug_tty()->emit_char(ch);
} else if (auto* boot_console = g_boot_console.load()) {
boot_console->write(ch, true);
}
}
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, char const* fmt, ...);
int sprintf(char* buffer, char const* 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;
}
int snprintf(char* buffer, size_t size, char const* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
size_t space_remaining = 0;
if (size) {
space_remaining = size - 1;
} else {
space_remaining = 0;
}
auto sized_buffer_putch = [&](char*& bufptr, char ch) {
if (space_remaining) {
*bufptr++ = ch;
--space_remaining;
}
};
int ret = printf_internal(sized_buffer_putch, buffer, fmt, ap);
if (space_remaining) {
buffer[ret] = '\0';
} else if (size > 0) {
buffer[size - 1] = '\0';
}
va_end(ap);
return ret;
}
static inline void internal_dbgputch(char ch)
{
if (s_serial_debug_enabled)
serial_putch(ch);
#if ARCH(I386) || ARCH(X86_64)
bochs_debug_output(ch);
#endif
}
extern "C" void dbgputchar(char ch)
{
internal_dbgputch(ch);
}
extern "C" void dbgputstr(char const* characters, size_t length)
{
if (!characters)
return;
SpinlockLocker lock(s_log_lock);
for (size_t i = 0; i < length; ++i)
internal_dbgputch(characters[i]);
}
void dbgputstr(StringView view)
{
::dbgputstr(view.characters_without_null_termination(), view.length());
}
extern "C" void kernelputstr(char const* characters, size_t length)
{
if (!characters)
return;
SpinlockLocker lock(s_log_lock);
for (size_t i = 0; i < length; ++i)
console_out(characters[i]);
}
extern "C" void kernelcriticalputstr(char const* characters, size_t length)
{
if (!characters)
return;
SpinlockLocker lock(s_log_lock);
for (size_t i = 0; i < length; ++i)
critical_console_out(characters[i]);
}
extern "C" void kernelearlyputstr(char const* characters, size_t length)
{
if (!characters)
return;
// NOTE: We do not lock the log lock here, as this function is called before this or any other processor was initialized, meaning:
// A) The $gs base was not setup yet, so we cannot enter into critical sections, and as a result we cannot use SpinLocks
// B) No other processors may try to print at the same time anyway
for (size_t i = 0; i < length; ++i)
internal_dbgputch(characters[i]);
}
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