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Kernel: Abstract platform-specific serial port access from kprintf

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kprintf should not really care about the hardware-specific details of
each UART or serial port out there, so instead of using x86 specific
instructions, let's ensure that we will compile only the relevant code
for debug output for a targeted-specific platform.
This commit is contained in:
Liav A 2022-09-02 13:15:27 +03:00 • committed by Linus Groh
parent d5ee03ef5b
commit a02c9c9569
6 changed files with 109 additions and 28 deletions
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44
Kernel/kprintf.cpp
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@ -7,7 +7,10 @@
#include <AK/PrintfImplementation.h>
#include <AK/StringView.h>
#include <AK/Types.h>
#include <Kernel/Arch/x86/IO.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>
@ -43,39 +46,20 @@ static void serial_putch(char ch)
if (PCISerialDevice::is_available())
return PCISerialDevice::the().put_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);
was_cr = ch == '\r';
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)
IO::out8(IO::BOCHS_DEBUG_PORT, ch);
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()) {
@ -95,7 +79,9 @@ static void console_out(char ch)
if (DeviceManagement::the().is_console_device_attached()) {
DeviceManagement::the().console_device().put_char(ch);
} else {
IO::out8(IO::BOCHS_DEBUG_PORT, ch);
#if ARCH(I386) || ARCH(X86_64)
bochs_debug_output(ch);
#endif
}
if (ConsoleManagement::is_initialized()) {
ConsoleManagement::the().debug_tty()->emit_char(ch);
@ -153,7 +139,9 @@ static inline void internal_dbgputch(char ch)
{
if (s_serial_debug_enabled)
serial_putch(ch);
IO::out8(IO::BOCHS_DEBUG_PORT, ch);
#if ARCH(I386) || ARCH(X86_64)
bochs_debug_output(ch);
#endif
}
extern "C" void dbgputstr(char const* characters, size_t length)