kdbg.c File Reference

#include <ntoskrnl.h>
#include <arm/peripherals/pl011.h>
#include <debug.h>

Include dependency graph for kdbg.c:

Go to the source code of this file.

Macros
#define	NDEBUG
#define	HACK   24000000

Functions
BOOLEAN NTAPI	KdPortInitializeEx (IN PCPPORT PortInformation, IN ULONG ComPortNumber)
BOOLEAN NTAPI	KdPortGetByteEx (IN PCPPORT PortInformation, OUT PUCHAR ByteReceived)
VOID NTAPI	KdPortPutByteEx (IN PCPPORT PortInformation, IN UCHAR ByteToSend)

Variables
CPPORT	DefaultPort = {0, 0, 0}

Macro Definition Documentation

HACK

#define HACK   24000000

Definition at line 24 of file kdbg.c.

NDEBUG

#define NDEBUG

Definition at line 13 of file kdbg.c.

Function Documentation

KdPortGetByteEx()

BOOLEAN NTAPI KdPortGetByteEx	(	IN PCPPORT	PortInformation,
		OUT PUCHAR	ByteReceived
	)

Definition at line 81 of file kdbg.c.

{
    UNIMPLEMENTED;
    while (TRUE);
    return FALSE;
}

KdPortInitializeEx()

BOOLEAN NTAPI KdPortInitializeEx	(	IN PCPPORT	PortInformation,
		IN ULONG	ComPortNumber
	)

Definition at line 30 of file kdbg.c.

{
    ULONG Divider, Remainder, Fraction;
    ULONG Baudrate = PortInformation->BaudRate;

    //
    // Calculate baudrate clock divider and remainder
    //
    Divider   = HACK / (16 * Baudrate);
    Remainder = HACK % (16 * Baudrate);

    //
    // Calculate the fractional part
    //
    Fraction  = (8 * Remainder / Baudrate) >> 1;
    Fraction += (8 * Remainder / Baudrate) & 1;

    //
    // Disable interrupts
    //
    WRITE_REGISTER_ULONG((PULONG)UART_PL011_CR, 0);

    //
    // Set the baud rate
    //
    WRITE_REGISTER_ULONG((PULONG)UART_PL011_IBRD, Divider);
    WRITE_REGISTER_ULONG((PULONG)UART_PL011_FBRD, Fraction);

    //
    // Set 8 bits for data, 1 stop bit, no parity, FIFO enabled
    //
    WRITE_REGISTER_ULONG((PULONG)UART_PL011_LCRH,
                         UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN);

    //
    // Clear and enable FIFO
    //
    WRITE_REGISTER_ULONG((PULONG)UART_PL011_CR,
                         UART_PL011_CR_UARTEN |
                         UART_PL011_CR_TXE |
                         UART_PL011_CR_RXE);

    //
    // Done
    //
    return TRUE;
}

KdPortPutByteEx()

VOID NTAPI KdPortPutByteEx	(	IN PCPPORT	PortInformation,
		IN UCHAR	ByteToSend
	)

Definition at line 91 of file kdbg.c.

{
    //
    // Wait for ready
    //
    while ((READ_REGISTER_ULONG((PULONG)UART_PL01x_FR) & UART_PL01x_FR_TXFF) != 0);

    //
    // Send the character
    //
    WRITE_REGISTER_ULONG((PULONG)UART_PL01x_DR, ByteToSend);
}

Variable Documentation

DefaultPort

CPPORT DefaultPort = {0, 0, 0}

Definition at line 18 of file kdbg.c.

Referenced by KdPortInitializeEx().