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xenvm: drivers: serial: Implement serial interface to Xen PV console

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This commit adds minimal support of Xen hypervisor console via UART-like
driver. Implementation allows to use poll_in/poll_out char interface for
uart_console.c driver directly to HV console instead of using Xen
virtual PL011 UART. Future implementation will support interrupt driven
interface on Xen event channels, currently it is under development.

Also this commit introduces early console_io Xen interface, which allows
to receive printk/stdout messages quickly after start, but requires Xen,
built with CONFIG_DEBUG option.

Signed-off-by: Dmytro Firsov <dmytro_firsov@epam.com>
This commit is contained in:
Dmytro Firsov 2021-07-02 11:31:56 +03:00 • committed by Carles Cufí
commit d9a3efb834
13 changed files with 348 additions and 2 deletions
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23
include/xen/console.h Normal file
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/*
* Copyright (c) 2021 EPAM Systems
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __XEN_CONSOLE_H__
#define __XEN_CONSOLE_H__
#include <init.h>
#include <device.h>
#include <drivers/uart.h>
#include <sys/device_mmio.h>
struct hvc_xen_data {
DEVICE_MMIO_RAM; /* should be first */
const struct device *dev;
struct xencons_interface *intf;
uint64_t evtchn;
};
int xen_console_init(const struct device *dev);
#endif /* __XEN_CONSOLE_H__ */

13
include/xen/events.h Normal file
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/*
* Copyright (c) 2021 EPAM Systems
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __XEN_EVENTS_H__
#define __XEN_EVENTS_H__
#include <xen/public/event_channel.h>
void notify_evtchn(evtchn_port_t port);
#endif /* __XEN_EVENTS_H__ */

14
include/xen/generic.h Normal file
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/*
* Copyright (c) 2021 EPAM Systems
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __XEN_GENERIC_H__
#define __XEN_GENERIC_H__
#include <xen/public/xen.h>
#define XEN_PAGE_SIZE 4096
#define XEN_PAGE_SHIFT 12
#endif /* __XEN_GENERIC_H__ */

17
include/xen/hvm.h Normal file
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/*
* Copyright (c) 2021 EPAM Systems
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __XEN_HVM_H__
#define __XEN_HVM_H__
#include <xen/public/hvm/hvm_op.h>
#include <xen/public/hvm/params.h>
#include <kernel.h>
int hvm_set_parameter(int idx, uint64_t value);
int hvm_get_parameter(int idx, uint64_t *value);
#endif /* __XEN_HVM_H__ */