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/* -------------------------------------------
Copyright (C) 2024-2025, Amlal EL Mahrouss, all rights reserved.
------------------------------------------- */
#include <ArchKit/ArchKit.h>
#include <KernelKit/DebugOutput.h>
#include <NewKit/Utils.h>
#include <NewKit/New.h>
#include <Mod/CoreGfx/FBMgr.h>
#include <Mod/CoreGfx/TextMgr.h>
namespace Kernel
{
enum CommStatus
{
kStateInvalid,
kStateReady = 0xCF,
kStateTransmit = 0xFC,
kStateCnt = 3
};
namespace Detail
{
constexpr Int16 kPort = 0x3F8;
static Int32 kState = kStateInvalid;
/// @brief Init COM1.
/// @return
template <Int16 PORT>
bool hal_serial_init() noexcept
{
if (kState == kStateReady || kState == kStateTransmit)
return true;
HAL::rt_out8(PORT + 1, 0x00); // Disable all interrupts
HAL::rt_out8(PORT + 3, 0x80); // Enable DLAB (set baud rate divisor)
HAL::rt_out8(PORT + 0, 0x03); // Set divisor to 3 (lo byte) 38400 baud
HAL::rt_out8(PORT + 1, 0x00); // (hi byte)
HAL::rt_out8(PORT + 3, 0x03); // 8 bits, no parity, one stop bit
HAL::rt_out8(PORT + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
HAL::rt_out8(PORT + 4, 0x0B); // IRQs enabled, RTS/DSR set
HAL::rt_out8(PORT + 4, 0x1E); // Set in loopback mode, test the serial chip
HAL::rt_out8(PORT + 0, 0xAE); // Test serial chip (send byte 0xAE and check if
// serial returns same byte)
// Check if serial is faulty (i.e: not same byte as sent)
if (HAL::rt_in8(PORT) != 0xAE)
{
ke_panic(RUNTIME_CHECK_HANDSHAKE);
}
kState = kStateReady;
// If serial is not faulty set it in normal operation mode
// (not-loopback with IRQs enabled and OUT#1 and OUT#2 bits enabled)
HAL::rt_out8(PORT + 4, 0x0F);
return true;
}
} // namespace Detail
TerminalDevice::~TerminalDevice() = default;
EXTERN_C void ke_io_write(const Char* bytes)
{
#ifdef __DEBUG__
Detail::hal_serial_init<Detail::kPort>();
if (!bytes || Detail::kState != kStateReady)
return;
if (*bytes == 0)
return;
Detail::kState = kStateTransmit;
SizeT index = 0;
SizeT len = 0;
index = 0;
len = rt_string_len(bytes, 255);
static int x = kFontSizeX, y = kFontSizeY;
auto log_txt = RGB(0xff, 0xff, 0xff);
while (index < len)
{
if (bytes[index] == '\r')
HAL::rt_out8(Detail::kPort, '\r');
HAL::rt_out8(Detail::kPort, bytes[index] == '\r' ? '\n' : bytes[index]);
char tmp_str[2];
tmp_str[0] = bytes[index];
tmp_str[1] = 0;
fb_render_string(tmp_str, y, x, log_txt);
if (bytes[index] == '\r')
{
y += kFontSizeY;
x = kFontSizeX;
}
x += kFontSizeX;
if (y > kHandoverHeader->f_GOP.f_Height)
{
y = kFontSizeY;
FB::fb_clear_video();
}
++index;
}
Detail::kState = kStateReady;
#endif // __DEBUG__
}
EXTERN_C void ke_io_read(const Char* bytes)
{
#ifdef __DEBUG__
Detail::hal_serial_init<Detail::kPort>();
if (!bytes || Detail::kState != kStateReady)
return;
Detail::kState = kStateTransmit;
SizeT index = 0;
///! TODO: Look on how to wait for the UART to complete.
while (true)
{
auto in = HAL::rt_in8(Detail::kPort);
///! If enter pressed then break.
if (in == 0xD)
{
break;
}
if (in < '0' || in < 'A' || in < 'a')
{
if (in != '@' || in != '!' || in != '?' || in != '.' || in != '/' ||
in != ':')
{
continue;
}
}
((char*)bytes)[index] = in;
++index;
}
((char*)bytes)[index] = 0;
Detail::kState = kStateReady;
#endif // __DEBUG__
}
TerminalDevice TerminalDevice::The() noexcept
{
TerminalDevice out(Kernel::ke_io_write, Kernel::ke_io_read);
return out;
}
} // namespace Kernel
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