mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
318 lines
8.4 KiB
C++
318 lines
8.4 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011.
|
|
|
|
This file is part of Sortix.
|
|
|
|
Sortix is free software: you can redistribute it and/or modify it under the
|
|
terms of the GNU General Public License as published by the Free Software
|
|
Foundation, either version 3 of the License, or (at your option) any later
|
|
version.
|
|
|
|
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
|
details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
uart.cpp
|
|
A simple serial terminal driver.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <sortix/kernel/cpu.h>
|
|
#include <sortix/kernel/kernel.h>
|
|
|
|
#include <string.h>
|
|
#include "vga.h"
|
|
#include "uart.h"
|
|
|
|
namespace Sortix
|
|
{
|
|
namespace UART
|
|
{
|
|
const unsigned TXR = 0; // Transmit register
|
|
const unsigned RXR = 0; // Receive register
|
|
const unsigned IER = 1; // Interrupt Enable
|
|
const unsigned IIR = 2; // Interrupt ID
|
|
const unsigned FCR = 2; // FIFO control
|
|
const unsigned LCR = 3; // Line control
|
|
const unsigned MCR = 4; // Modem control
|
|
const unsigned LSR = 5; // Line Status
|
|
const unsigned MSR = 6; // Modem Status
|
|
const unsigned DLL = 0; // Divisor Latch Low
|
|
const unsigned DLM = 1; // Divisor latch High
|
|
|
|
const unsigned LCR_DLAB = 0x80; // Divisor latch access bit
|
|
const unsigned LCR_SBC = 0x40; // Set break control
|
|
const unsigned LCR_SPAR = 0x20; // Stick parity (?)
|
|
const unsigned LCR_EPAR = 0x10; // Even parity select
|
|
const unsigned LCR_PARITY = 0x08; // Parity Enable
|
|
const unsigned LCR_STOP = 0x04; // Stop bits: 0=1 bit, 1=2 bits
|
|
const unsigned LCR_WLEN5 = 0x00; // Wordlength: 5 bits
|
|
const unsigned LCR_WLEN6 = 0x01; // Wordlength: 6 bits
|
|
const unsigned LCR_WLEN7 = 0x02; // Wordlength: 7 bits
|
|
const unsigned LCR_WLEN8 = 0x03; // Wordlength: 8 bits
|
|
|
|
const unsigned LSR_TEMT = 0x40; // Transmitter empty
|
|
const unsigned LSR_THRE = 0x20; // Transmit-hold-register empty
|
|
const unsigned LSR_READY = 0x1;
|
|
|
|
const unsigned Port = 0x3f8;
|
|
|
|
const unsigned BASE_BAUD = 1843200/16;
|
|
const unsigned BOTH_EMPTY = LSR_TEMT | LSR_THRE;
|
|
|
|
const unsigned FrameWidth = 80;
|
|
const unsigned FrameHeight = 25;
|
|
uint16_t VGALastFrame[FrameWidth * FrameHeight];
|
|
|
|
unsigned ProbeBaud(unsigned Port)
|
|
{
|
|
uint8_t lcr = CPU::InPortB(Port + LCR);
|
|
CPU::OutPortB(Port + LCR, lcr | LCR_DLAB);
|
|
uint8_t dll = CPU::InPortB(Port + DLL);
|
|
uint8_t dlm = CPU::InPortB(Port + DLM);
|
|
CPU::OutPortB(Port + LCR, lcr);
|
|
unsigned quot = (dlm << 8) | dll;
|
|
|
|
return BASE_BAUD / quot;
|
|
}
|
|
|
|
void WaitForEmptyBuffers(unsigned Port)
|
|
{
|
|
while ( true )
|
|
{
|
|
unsigned Status = CPU::InPortB(Port + LSR);
|
|
|
|
if ( (Status & BOTH_EMPTY) == BOTH_EMPTY )
|
|
{
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
unsigned Baud;
|
|
|
|
void Init()
|
|
{
|
|
InvalidateVGA();
|
|
|
|
Baud = ProbeBaud(Port);
|
|
|
|
CPU::OutPortB(Port + LCR, 0x3); // 8n1
|
|
CPU::OutPortB(Port + IER, 0); // No interrupt
|
|
CPU::OutPortB(Port + FCR, 0); // No FIFO
|
|
CPU::OutPortB(Port + MCR, 0x3); // DTR + RTS
|
|
|
|
unsigned Divisor = 115200 / Baud;
|
|
uint8_t C = CPU::InPortB(Port + LCR);
|
|
CPU::OutPortB(Port + LCR, C | LCR_DLAB);
|
|
CPU::OutPortB(Port + DLL, Divisor & 0xFF);
|
|
CPU::OutPortB(Port + DLM, (Divisor >> 8) & 0xFF);
|
|
CPU::OutPortB(Port + LCR, C & ~LCR_DLAB);
|
|
}
|
|
|
|
void Read(uint8_t* Buffer, size_t Size)
|
|
{
|
|
// Save the IER and disable interrupts.
|
|
unsigned ier = CPU::InPortB(Port + IER);
|
|
CPU::OutPortB(Port + IER, 0);
|
|
|
|
for ( size_t I = 0; I < Size; I++ )
|
|
{
|
|
while ( ! ( CPU::InPortB(Port + LSR) & LSR_READY ) ) { }
|
|
|
|
Buffer[I] = CPU::InPortB(Port);
|
|
}
|
|
|
|
// Wait for transmitter to become empty and restore the IER.
|
|
WaitForEmptyBuffers(Port);
|
|
CPU::OutPortB(Port + IER, ier);
|
|
}
|
|
|
|
void Write(const void* B, size_t Size)
|
|
{
|
|
const uint8_t* Buffer = (const uint8_t*) B;
|
|
|
|
// Save the IER and disable interrupts.
|
|
unsigned ier = CPU::InPortB(Port + IER);
|
|
CPU::OutPortB(Port + IER, 0);
|
|
|
|
for ( size_t I = 0; I < Size; I++ )
|
|
{
|
|
WaitForEmptyBuffers(Port);
|
|
|
|
CPU::OutPortB(Port, Buffer[I]);
|
|
}
|
|
|
|
// Wait for transmitter to become empty and restore the IER.
|
|
WaitForEmptyBuffers(Port);
|
|
CPU::OutPortB(Port + IER, ier);
|
|
}
|
|
|
|
void WriteChar(char C)
|
|
{
|
|
// Save the IER and disable interrupts.
|
|
unsigned ier = CPU::InPortB(Port + IER);
|
|
CPU::OutPortB(Port + IER, 0);
|
|
|
|
WaitForEmptyBuffers(Port);
|
|
|
|
CPU::OutPortB(Port, C);
|
|
|
|
// Wait for transmitter to become empty and restore the IER.
|
|
WaitForEmptyBuffers(Port);
|
|
CPU::OutPortB(Port + IER, ier);
|
|
}
|
|
|
|
int TryPopChar()
|
|
{
|
|
// Save the IER and disable interrupts.
|
|
unsigned ier = CPU::InPortB(Port + IER);
|
|
CPU::OutPortB(Port + IER, 0);
|
|
|
|
int Result = -1;
|
|
|
|
if ( CPU::InPortB(Port + LSR) & LSR_READY )
|
|
{
|
|
Result = CPU::InPortB(Port);
|
|
}
|
|
|
|
// Wait for transmitter to become empty and restore the IER.
|
|
WaitForEmptyBuffers(Port);
|
|
CPU::OutPortB(Port + IER, ier);
|
|
|
|
return Result;
|
|
}
|
|
|
|
void WriteNumberAsString(uint8_t Num)
|
|
{
|
|
if ( Num > 100 ) { WriteChar(Num / 100); }
|
|
if ( Num > 10 ) { WriteChar(Num / 10); }
|
|
|
|
WriteChar(Num % 10);
|
|
}
|
|
|
|
// Change from VGA color to another color system.
|
|
unsigned ConversionTable[16] = { 0, 4, 2, 6, 1, 5, 3, 7, 0, 4, 2, 6, 1, 5, 3, 7 };
|
|
|
|
void InvalidateVGA()
|
|
{
|
|
for ( unsigned I = 0; I < FrameWidth * FrameHeight; I++ ) { VGALastFrame[I] = 0; }
|
|
}
|
|
|
|
void RenderVGA(const uint16_t* Frame)
|
|
{
|
|
const uint16_t* Source = Frame;
|
|
|
|
unsigned LastColor = 1337;
|
|
unsigned SkippedSince = 0;
|
|
bool posundefined = true;
|
|
|
|
for ( unsigned Y = 0; Y < FrameHeight; Y++)
|
|
{
|
|
for ( unsigned X = 0; X < FrameWidth; X++ )
|
|
{
|
|
unsigned Index = Y * FrameWidth + X;
|
|
|
|
unsigned Element = Source[Index];
|
|
unsigned OldElement = VGALastFrame[Index];
|
|
|
|
if ( Element == OldElement ) { continue; }
|
|
|
|
// Update the position if we skipped some characters.
|
|
if ( Index - SkippedSince > 8 || posundefined )
|
|
{
|
|
const unsigned LineId = Y + 1;
|
|
const unsigned ColumnId = X + 1;
|
|
|
|
if ( ColumnId > 1 )
|
|
{
|
|
UART::WriteChar('\e');
|
|
UART::WriteChar('[');
|
|
UART::WriteChar('0' + LineId / 10);
|
|
UART::WriteChar('0' + LineId % 10);
|
|
UART::WriteChar(';');
|
|
UART::WriteChar('0' + ColumnId / 10);
|
|
UART::WriteChar('0' + ColumnId % 10);
|
|
UART::WriteChar('H');
|
|
}
|
|
else
|
|
{
|
|
UART::WriteChar('\e');
|
|
UART::WriteChar('[');
|
|
UART::WriteChar('0' + LineId / 10);
|
|
UART::WriteChar('0' + LineId % 10);
|
|
UART::WriteChar('H');
|
|
}
|
|
|
|
SkippedSince = Index;
|
|
posundefined = false;
|
|
}
|
|
|
|
for ( unsigned Pos = SkippedSince; Pos <= Index; Pos++ )
|
|
{
|
|
Element = Source[Pos];
|
|
OldElement = VGALastFrame[Pos];
|
|
|
|
unsigned NewColor = (ConversionTable[ (Element >> 12) & 0xF ] << 3) | (ConversionTable[ (Element >> 8) & 0xF ]);
|
|
|
|
// Change the color if we need to.
|
|
if ( LastColor != NewColor )
|
|
{
|
|
unsigned OldFGColor = LastColor % 8;
|
|
unsigned OldBGColor = LastColor / 8;
|
|
unsigned FGColor = NewColor % 8;
|
|
unsigned BGColor = NewColor / 8;
|
|
if ( LastColor == 1337 ) { OldFGColor = 9; OldBGColor = 9; }
|
|
|
|
if ( (OldFGColor != FGColor) && (OldBGColor != BGColor) )
|
|
{
|
|
UART::WriteChar('\e');
|
|
UART::WriteChar('[');
|
|
UART::WriteChar('3');
|
|
UART::WriteChar('0' + FGColor);
|
|
UART::WriteChar(';');
|
|
UART::WriteChar('4');
|
|
UART::WriteChar('0' + BGColor);
|
|
UART::WriteChar('m');
|
|
}
|
|
else if ( OldFGColor != FGColor )
|
|
{
|
|
UART::WriteChar('\e');
|
|
UART::WriteChar('[');
|
|
UART::WriteChar('3');
|
|
UART::WriteChar('0' + FGColor);
|
|
UART::WriteChar('m');
|
|
}
|
|
else if ( OldBGColor != BGColor )
|
|
{
|
|
UART::WriteChar('\e');
|
|
UART::WriteChar('[');
|
|
UART::WriteChar('4');
|
|
UART::WriteChar('0' + BGColor);
|
|
UART::WriteChar('m');
|
|
}
|
|
|
|
LastColor = NewColor;
|
|
}
|
|
|
|
VGALastFrame[Pos] = Element;
|
|
|
|
Element &= 0x7F;
|
|
|
|
// Filter away any non-printable characters.
|
|
if ( Element < 32 || Element > 126 ) { Element = '?'; }
|
|
|
|
UART::WriteChar(Element);
|
|
}
|
|
|
|
SkippedSince = Index + 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|