Justin C. Miller
1904e240cf
- Add a tag field to all endpoint messages, which doubles as a notification field - Add a endpoint_bind_irq syscall to enable an endpoint to listen for interrupt notifications. This mechanism needs to change. - Add a temporary copy of the serial port code to nulldrv, and let it take responsibility for COM2
43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
#include "kutil/no_construct.h"
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#include "io.h"
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#include "serial.h"
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// This object is initialized _before_ global constructors are called,
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// so we don't want it to have global constructors at all, lest it
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// overwrite the previous initialization.
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static kutil::no_construct<serial_port> __g_com1_storage;
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serial_port &g_com1 = __g_com1_storage.value;
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serial_port::serial_port() :
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m_port(0)
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{
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}
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serial_port::serial_port(uint16_t port) :
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m_port(port)
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{
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outb(port + 1, 0x00); // Disable all interrupts
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outb(port + 3, 0x80); // Enable the Divisor Latch Access Bit
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outb(port + 0, 0x01); // Divisor low bit: 1 (115200 baud)
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outb(port + 1, 0x00); // Divisor high bit
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outb(port + 3, 0x03); // 8-N-1
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outb(port + 2, 0xe7); // Clear and enable FIFO, enable 64 byte, 56 byte trigger
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outb(port + 4, 0x0b); // Data terminal ready, Request to send, aux output 2 (irq enable)
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}
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bool serial_port::read_ready() { return (inb(m_port + 5) & 0x01) != 0; }
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bool serial_port::write_ready() { return (inb(m_port + 5) & 0x20) != 0; }
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char
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serial_port::read() {
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while (!read_ready());
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return inb(m_port);
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}
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void
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serial_port::write(char c) {
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while (!write_ready());
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outb(m_port, c);
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}
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