mirror of
https://github.com/reactos/reactos.git
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121 lines
2.2 KiB
C
121 lines
2.2 KiB
C
/*
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* PROJECT: ReactOS Kernel
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* LICENSE: BSD - See COPYING.ARM in the top level directory
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* FILE: ntoskrnl/inbv/inbvport.c
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* PURPOSE: Serial Port Boot Driver for Headless Terminal Support
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* PROGRAMMERS: ReactOS Portable Systems Group
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*/
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/* INCLUDES ******************************************************************/
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#include <ntoskrnl.h>
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#include <debug.h>
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/* GLOBALS *******************************************************************/
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CPPORT Port[4] =
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{
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{NULL, 0, TRUE},
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{NULL, 0, TRUE},
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{NULL, 0, TRUE},
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{NULL, 0, TRUE}
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};
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/* FUNCTIONS *****************************************************************/
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VOID
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NTAPI
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InbvPortEnableFifo(
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IN ULONG PortId,
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IN BOOLEAN Enable
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)
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{
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/* Set FIFO as requested */
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CpEnableFifo(Port[PortId].Address, Enable);
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}
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VOID
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NTAPI
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InbvPortPutByte(
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IN ULONG PortId,
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IN BOOLEAN Output
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)
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{
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/* Send the byte */
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CpPutByte(&Port[PortId], Output);
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}
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VOID
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NTAPI
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InbvPortTerminate(
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IN ULONG PortId
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)
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{
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/* The port is now available */
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Port[PortId].Address = NULL;
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}
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BOOLEAN
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NTAPI
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InbvPortInitialize(
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IN ULONG BaudRate,
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IN ULONG PortNumber,
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IN PUCHAR PortAddress,
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OUT PULONG PortId,
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IN BOOLEAN IsMMIODevice
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)
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{
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/* Not yet supported */
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ASSERT(IsMMIODevice == FALSE);
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/* Set default baud rate */
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if (BaudRate == 0) BaudRate = 19200;
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/* Check if port or address given */
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if (PortNumber)
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{
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/* Pick correct address for port */
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if (!PortAddress)
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{
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switch (PortNumber)
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{
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case 1:
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PortAddress = (PUCHAR)0x3F8;
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break;
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case 2:
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PortAddress = (PUCHAR)0x2F8;
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break;
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case 3:
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PortAddress = (PUCHAR)0x3E8;
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break;
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default:
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PortNumber = 4;
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PortAddress = (PUCHAR)0x2E8;
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}
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}
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}
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else
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{
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/* Pick correct port for address */
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PortAddress = (PUCHAR)0x2F8;
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if (CpDoesPortExist(PortAddress))
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{
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PortNumber = 2;
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}
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else
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{
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PortAddress = (PUCHAR)0x3F8;
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if (!CpDoesPortExist(PortAddress)) return FALSE;
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PortNumber = 1;
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}
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}
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/* Initialize the port unless it's already up, and then return it */
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if (Port[PortNumber - 1].Address) return FALSE;
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CpInitialize(&Port[PortNumber - 1], PortAddress, BaudRate);
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*PortId = PortNumber - 1;
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return TRUE;
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}
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