1 /* $NetBSD: pvh_consinit.c,v 1.6 2023/10/17 13:27:58 bouyer Exp $ */
2
3 /*
4 * Copyright (c) 2020 Manuel Bouyer.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: pvh_consinit.c,v 1.6 2023/10/17 13:27:58 bouyer Exp $");
30
31 #include "xencons.h"
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/device.h>
35 #include <uvm/uvm_extern.h>
36 #include <uvm/uvm_prot.h>
37
38 #include <dev/cons.h>
39 #include <xen/xen.h>
40 #include <xen/hypervisor.h>
41 #include <xen/include/public/hvm/hvm_op.h>
42 #include <xen/include/public/hvm/params.h>
43
44 #include "xen_def_cons.h"
45
46 int
xen_pvh_consinit(void)47 xen_pvh_consinit(void)
48 {
49 /*
50 * hugly hack because we're called multiple times at different
51 * boot stage.
52 */
53 static int initted = 0;
54
55 if (initted == 0) {
56 /* fall back to printk() until we can setup our console */
57 xen_early_console();
58 }
59 if (xendomain_is_dom0()) {
60 union xen_cmdline_parseinfo xcp;
61 xen_parse_cmdline(XEN_PARSE_CONSOLE, &xcp);
62 #ifdef CONS_OVERRIDE
63 if (strcmp(default_consinfo.devname, "tty0") == 0 ||
64 strcmp(default_consinfo.devname, "pc") == 0) {
65 #else
66 if (strcmp(xcp.xcp_console, "tty0") == 0 || /* linux name */
67 strcmp(xcp.xcp_console, "pc") == 0) { /* NetBSD name */
68 #endif /* CONS_OVERRIDE */
69 initted++;
70 return 0; /* native console code will do it */
71 }
72 }
73 if (initted == 0 && !xendomain_is_dom0()) {
74 /* pmap not up yet */
75 initted++;
76 return 1;
77 } else if (initted > 1) {
78 return 1;
79 }
80 initted++;
81 if (xendomain_is_dom0()) {
82 /* we know we're using Xen's console at this point */
83 xenconscn_attach(); /* no ring in this case */
84 initted++; /* don't init console twice */
85 return 1;
86 }
87
88 #if NXENCONS > 0
89 /* we can now map the xencons rings. */
90 struct xen_hvm_param xen_hvm_param;
91
92
93 xen_hvm_param.domid = DOMID_SELF;
94 xen_hvm_param.index = HVM_PARAM_CONSOLE_PFN;
95
96 if ( HYPERVISOR_hvm_op(HVMOP_get_param, &xen_hvm_param) < 0)
97 panic("xen_pvh_consinit: can't get console PFN");
98
99 xen_start_info.console.domU.mfn = xen_hvm_param.value;
100 pmap_kenter_pa((vaddr_t) xencons_interface, ptoa(xen_hvm_param.value),
101 VM_PROT_READ|VM_PROT_WRITE, 0);
102
103 xen_hvm_param.domid = DOMID_SELF;
104 xen_hvm_param.index = HVM_PARAM_CONSOLE_EVTCHN;
105
106 if ( HYPERVISOR_hvm_op(HVMOP_get_param, &xen_hvm_param) < 0)
107 panic("xen_pvh_consinit: can't get console event");
108
109 xen_start_info.console.domU.evtchn = xen_hvm_param.value;
110 xenconscn_attach();
111 #endif
112 return 1;
113 }
114