/* $NetBSD: pvh_consinit.c,v 1.3 2023/03/24 12:28:42 bouyer Exp $ */
/*
* Copyright (c) 2020 Manuel Bouyer.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pvh_consinit.c,v 1.3 2023/03/24 12:28:42 bouyer Exp $");
#include "xencons.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <uvm/uvm_extern.h>
#include <uvm/uvm_prot.h>
#include <dev/cons.h>
#include <xen/xen.h>
#include <xen/hypervisor.h>
#include <xen/include/public/hvm/hvm_op.h>
#include <xen/include/public/hvm/params.h>
static int pvh_xenconscn_getc(dev_t);
static void pvh_xenconscn_putc(dev_t, int);
static void pvh_xenconscn_pollc(dev_t, int);
static struct consdev pvh_xencons = {
NULL, NULL, pvh_xenconscn_getc, pvh_xenconscn_putc, pvh_xenconscn_pollc,
NULL, NULL, NULL, NODEV, CN_NORMAL
};
int
xen_pvh_consinit(void)
{
/*
* hugly hack because we're called multiple times at different
* boot stage.
*/
static int initted = 0;
if (xendomain_is_dom0()) {
union xen_cmdline_parseinfo xcp;
xen_parse_cmdline(XEN_PARSE_CONSOLE, &xcp);
#ifdef CONS_OVERRIDE
if (strcmp(default_consinfo.devname, "tty0") == 0 ||
strcmp(default_consinfo.devname, "pc") == 0) {
#else
if (strcmp(xcp.xcp_console, "tty0") == 0 || /* linux name */
strcmp(xcp.xcp_console, "pc") == 0) { /* NetBSD name */
#endif /* CONS_OVERRIDE */
return 0; /* native console code will do it */
}
}
if (initted == 0 && !xendomain_is_dom0()) {
/* pmap not up yet, fall back to printk() */
cn_tab = &pvh_xencons;
initted++;
return 1;
} else if (initted > 1) {
return 1;
}
initted++;
if (xendomain_is_dom0()) {
/* we know we're using Xen's console at this point */
xenconscn_attach(); /* no ring in this case */
initted++; /* don't init console twice */
return 1;
}
#if NXENCONS > 0
/* we can now map the xencons rings. */
struct xen_hvm_param xen_hvm_param;
xen_hvm_param.domid = DOMID_SELF;
xen_hvm_param.index = HVM_PARAM_CONSOLE_PFN;
if ( HYPERVISOR_hvm_op(HVMOP_get_param, &xen_hvm_param) < 0)
panic("xen_pvh_consinit: can't get console PFN");
xen_start_info.console.domU.mfn = xen_hvm_param.value;
pmap_kenter_pa((vaddr_t) xencons_interface, ptoa(xen_hvm_param.value),
VM_PROT_READ|VM_PROT_WRITE, 0);
xen_hvm_param.domid = DOMID_SELF;
xen_hvm_param.index = HVM_PARAM_CONSOLE_EVTCHN;
if ( HYPERVISOR_hvm_op(HVMOP_get_param, &xen_hvm_param) < 0)
panic("xen_pvh_consinit: can't get console event");
xen_start_info.console.domU.evtchn = xen_hvm_param.value;
xenconscn_attach();
#endif
return 1;
}
static int
pvh_xenconscn_getc(dev_t dev)
{
while(1)
;
return -1;
}
static void
pvh_xenconscn_putc(dev_t dev, int c)
{
printk("%c", c);
}
static void
pvh_xenconscn_pollc(dev_t dev, int on)
{
return;
}