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to a virtual machine then we implicitly create COM1 and COM2 ISA devices. Prior to this change the only way of attaching a COM port to the virtual machine was by presenting it as a PCI device that is mapped at the legacy I/O address 0x3F8 or 0x2F8. There were some issues with the original approach: - It did not work at all with UEFI because UEFI will reprogram the PCI device BARs and remap the COM1/COM2 ports at non-legacy addresses. - OpenBSD GENERIC kernel does not create a /dev/console because it expects the uart device at the legacy 0x3F8/0x2F8 address to be an ISA device. - It was functional with a FreeBSD guest but caused the console to appear on /dev/ttyu2 which was not intuitive. The uart emulation is now independent of the bus on which it resides. Thus it is possible to have uart devices on the PCI bus in addition to the legacy COM1/COM2 devices behind the LPC bus. The command line option to attach ISA COM1/COM2 ports to a virtual machine is "-s <bus>,lpc -l com1,stdio". The command line option to create a PCI-attached uart device is: "-s <bus>,uart[,stdio]" The command line option to create PCI-attached COM1/COM2 device is: "-S <bus>,uart[,stdio]". This style of creating COM ports is deprecated. Discussed with: grehan Reviewed by: grehan Submitted by: Tycho Nightingale (tycho.nightingale@pluribusnetworks.com) M share/examples/bhyve/vmrun.sh AM usr.sbin/bhyve/legacy_irq.c AM usr.sbin/bhyve/legacy_irq.h M usr.sbin/bhyve/Makefile AM usr.sbin/bhyve/uart_emul.c M usr.sbin/bhyve/bhyverun.c AM usr.sbin/bhyve/uart_emul.h M usr.sbin/bhyve/pci_uart.c M usr.sbin/bhyve/pci_emul.c M usr.sbin/bhyve/inout.c M usr.sbin/bhyve/pci_emul.h M usr.sbin/bhyve/inout.h AM usr.sbin/bhyve/pci_lpc.c AM usr.sbin/bhyve/pci_lpc.h
46 lines
1.8 KiB
C
46 lines
1.8 KiB
C
/*-
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* Copyright (c) 2013 Neel Natu <neel@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _UART_EMUL_H_
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#define _UART_EMUL_H_
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#define UART_IO_BAR_SIZE 8
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struct uart_softc;
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typedef void (*uart_intr_func_t)(void *arg);
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struct uart_softc *uart_init(uart_intr_func_t intr_assert,
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uart_intr_func_t intr_deassert, void *arg);
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int uart_legacy_alloc(int unit, int *ioaddr, int *irq);
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uint8_t uart_read(struct uart_softc *sc, int offset);
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void uart_write(struct uart_softc *sc, int offset, uint8_t value);
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int uart_set_backend(struct uart_softc *sc, const char *opt);
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#endif
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