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Kernel: Make serial devices to their own class

This commit is contained in:
Bananymous 2023-09-04 14:57:05 +03:00
parent 2e2a913412
commit 9b47603a1d
3 changed files with 74 additions and 30 deletions
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25
kernel/include/kernel/Serial.h
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@ -1,11 +1,28 @@
#pragma once
namespace Serial
#include <BAN/Errors.h>
namespace Kernel
{
void initialize();
bool is_initialized();
class Serial
{
public:
static void initialize();
static bool has_devices();
static void putchar_any(char);
void putchar(char);
void putchar(char);
private:
static bool port_has_device(uint16_t);
bool is_transmit_empty() const;
bool is_valid() const { return m_port != 0; }
private:
uint16_t m_port { 0 };
};
}

4
kernel/kernel/Debug.cpp
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@ -60,8 +60,8 @@ namespace Debug
void putchar(char ch)
{
if (Serial::is_initialized())
return Serial::putchar(ch);
if (Kernel::Serial::has_devices())
return Kernel::Serial::putchar_any(ch);
if (Kernel::TTY::is_initialized())
return Kernel::TTY::putchar_current(ch);
}

79
kernel/kernel/Serial.cpp
View File

@ -1,49 +1,76 @@
#include <BAN/Errors.h>
#include <BAN/Array.h>
#include <kernel/IO.h>
#include <kernel/Serial.h>
#define COM1_PORT 0x3f8
namespace Serial
namespace Kernel
{
static bool s_initialized = false;
static constexpr uint16_t s_serial_ports[] = { 0x3F8, 0x2F8, 0x3E8, 0x2E8, 0x5F8, 0x4F8, 0x5E8, 0x4E8 };
static BAN::Array<Serial, sizeof(s_serial_ports) / sizeof(*s_serial_ports)> s_serial_devices;
static bool s_has_devices { false };
void initialize()
void Serial::initialize()
{
IO::outb(COM1_PORT + 1, 0x00); // Disable all interrupts
IO::outb(COM1_PORT + 3, 0x80); // Enable DLAB (set baud rate divisor)
IO::outb(COM1_PORT + 0, 0x03); // Set divisor to 3 (lo byte) 38400 baud
IO::outb(COM1_PORT + 1, 0x00); // (hi byte)
IO::outb(COM1_PORT + 3, 0x03); // 8 bits, no parity, one stop bit
IO::outb(COM1_PORT + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
IO::outb(COM1_PORT + 4, 0x0B); // IRQs enabled, RTS/DSR set
IO::outb(COM1_PORT + 4, 0x1E); // Set in loopback mode, test the serial chip
IO::outb(COM1_PORT + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)
int count = 0;
for (size_t i = 0; i < s_serial_devices.size(); i++)
{
if (port_has_device(s_serial_ports[i]))
{
s_serial_devices[i].m_port = s_serial_ports[i];
count++;
}
}
s_has_devices = !!count;
dprintln("Initialized {} serial devices", count);
}
bool Serial::port_has_device(uint16_t port)
{
IO::outb(port + 1, 0x00); // Disable all interrupts
IO::outb(port + 3, 0x80); // Enable DLAB (set baud rate divisor)
IO::outb(port + 0, 0x03); // Set divisor to 3 (lo byte) 38400 baud
IO::outb(port + 1, 0x00); // (hi byte)
IO::outb(port + 3, 0x03); // 8 bits, no parity, one stop bit
IO::outb(port + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
IO::outb(port + 4, 0x0B); // IRQs enabled, RTS/DSR set
IO::outb(port + 4, 0x1E); // Set in loopback mode, test the serial chip
IO::outb(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(IO::inb(COM1_PORT + 0) != 0xAE)
return;
return false;
// If serial is not faulty set it in normal operation mode
// (not-loopback with IRQs enabled and OUT#1 and OUT#2 bits enabled)
IO::outb(COM1_PORT + 4, 0x0F);
s_initialized = true;
IO::outb(port + 4, 0x0F);
return true;
}
bool is_initialized()
bool Serial::has_devices()
{
return s_initialized;
return s_has_devices;
}
static int is_transmit_empty() {
return IO::inb(COM1_PORT + 5) & 0x20;
}
void putchar(char c)
bool Serial::is_transmit_empty() const
{
ASSERT(s_initialized);
while (is_transmit_empty() == 0);
IO::outb(COM1_PORT, c);
return !(IO::inb(m_port + 5) & 0x20);
}
void Serial::putchar(char c)
{
while (is_transmit_empty())
continue;
IO::outb(m_port, c);
}
void Serial::putchar_any(char c)
{
for (auto& device : s_serial_devices)
if (device.is_valid())
device.putchar(c);
}
}