pvh_consinit.c revision 1.4 1 1.4 mrg /* $NetBSD: pvh_consinit.c,v 1.4 2023/07/22 19:13:17 mrg Exp $ */
2 1.1 bouyer
3 1.1 bouyer /*
4 1.1 bouyer * Copyright (c) 2020 Manuel Bouyer.
5 1.1 bouyer *
6 1.1 bouyer * Redistribution and use in source and binary forms, with or without
7 1.1 bouyer * modification, are permitted provided that the following conditions
8 1.1 bouyer * are met:
9 1.1 bouyer * 1. Redistributions of source code must retain the above copyright
10 1.1 bouyer * notice, this list of conditions and the following disclaimer.
11 1.1 bouyer * 2. Redistributions in binary form must reproduce the above copyright
12 1.1 bouyer * notice, this list of conditions and the following disclaimer in the
13 1.1 bouyer * documentation and/or other materials provided with the distribution.
14 1.1 bouyer *
15 1.1 bouyer * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 1.1 bouyer * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 1.1 bouyer * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 1.1 bouyer * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 1.1 bouyer * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 1.1 bouyer * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 1.1 bouyer * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 1.1 bouyer * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 1.1 bouyer * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 1.1 bouyer * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 1.1 bouyer *
26 1.1 bouyer */
27 1.1 bouyer
28 1.1 bouyer #include <sys/cdefs.h>
29 1.4 mrg __KERNEL_RCSID(0, "$NetBSD: pvh_consinit.c,v 1.4 2023/07/22 19:13:17 mrg Exp $");
30 1.1 bouyer
31 1.1 bouyer #include "xencons.h"
32 1.1 bouyer #include <sys/param.h>
33 1.1 bouyer #include <sys/systm.h>
34 1.1 bouyer #include <sys/device.h>
35 1.1 bouyer #include <uvm/uvm_extern.h>
36 1.1 bouyer #include <uvm/uvm_prot.h>
37 1.1 bouyer
38 1.1 bouyer #include <dev/cons.h>
39 1.1 bouyer #include <xen/xen.h>
40 1.1 bouyer #include <xen/hypervisor.h>
41 1.1 bouyer #include <xen/include/public/hvm/hvm_op.h>
42 1.1 bouyer #include <xen/include/public/hvm/params.h>
43 1.1 bouyer
44 1.4 mrg #include "xen_def_cons.h"
45 1.4 mrg
46 1.1 bouyer static int pvh_xenconscn_getc(dev_t);
47 1.1 bouyer static void pvh_xenconscn_putc(dev_t, int);
48 1.1 bouyer static void pvh_xenconscn_pollc(dev_t, int);
49 1.1 bouyer
50 1.1 bouyer static struct consdev pvh_xencons = {
51 1.1 bouyer NULL, NULL, pvh_xenconscn_getc, pvh_xenconscn_putc, pvh_xenconscn_pollc,
52 1.1 bouyer NULL, NULL, NULL, NODEV, CN_NORMAL
53 1.1 bouyer };
54 1.1 bouyer
55 1.1 bouyer
56 1.3 bouyer int
57 1.1 bouyer xen_pvh_consinit(void)
58 1.1 bouyer {
59 1.1 bouyer /*
60 1.1 bouyer * hugly hack because we're called multiple times at different
61 1.1 bouyer * boot stage.
62 1.1 bouyer */
63 1.1 bouyer static int initted = 0;
64 1.3 bouyer if (xendomain_is_dom0()) {
65 1.3 bouyer union xen_cmdline_parseinfo xcp;
66 1.3 bouyer xen_parse_cmdline(XEN_PARSE_CONSOLE, &xcp);
67 1.3 bouyer #ifdef CONS_OVERRIDE
68 1.3 bouyer if (strcmp(default_consinfo.devname, "tty0") == 0 ||
69 1.3 bouyer strcmp(default_consinfo.devname, "pc") == 0) {
70 1.3 bouyer #else
71 1.3 bouyer if (strcmp(xcp.xcp_console, "tty0") == 0 || /* linux name */
72 1.3 bouyer strcmp(xcp.xcp_console, "pc") == 0) { /* NetBSD name */
73 1.3 bouyer #endif /* CONS_OVERRIDE */
74 1.3 bouyer return 0; /* native console code will do it */
75 1.3 bouyer }
76 1.3 bouyer }
77 1.2 bouyer if (initted == 0 && !xendomain_is_dom0()) {
78 1.1 bouyer /* pmap not up yet, fall back to printk() */
79 1.1 bouyer cn_tab = &pvh_xencons;
80 1.1 bouyer initted++;
81 1.3 bouyer return 1;
82 1.1 bouyer } else if (initted > 1) {
83 1.3 bouyer return 1;
84 1.1 bouyer }
85 1.1 bouyer initted++;
86 1.2 bouyer if (xendomain_is_dom0()) {
87 1.3 bouyer /* we know we're using Xen's console at this point */
88 1.2 bouyer xenconscn_attach(); /* no ring in this case */
89 1.2 bouyer initted++; /* don't init console twice */
90 1.3 bouyer return 1;
91 1.2 bouyer }
92 1.3 bouyer
93 1.1 bouyer #if NXENCONS > 0
94 1.1 bouyer /* we can now map the xencons rings. */
95 1.1 bouyer struct xen_hvm_param xen_hvm_param;
96 1.1 bouyer
97 1.1 bouyer
98 1.1 bouyer xen_hvm_param.domid = DOMID_SELF;
99 1.1 bouyer xen_hvm_param.index = HVM_PARAM_CONSOLE_PFN;
100 1.1 bouyer
101 1.1 bouyer if ( HYPERVISOR_hvm_op(HVMOP_get_param, &xen_hvm_param) < 0)
102 1.1 bouyer panic("xen_pvh_consinit: can't get console PFN");
103 1.1 bouyer
104 1.1 bouyer xen_start_info.console.domU.mfn = xen_hvm_param.value;
105 1.1 bouyer pmap_kenter_pa((vaddr_t) xencons_interface, ptoa(xen_hvm_param.value),
106 1.1 bouyer VM_PROT_READ|VM_PROT_WRITE, 0);
107 1.1 bouyer
108 1.1 bouyer xen_hvm_param.domid = DOMID_SELF;
109 1.1 bouyer xen_hvm_param.index = HVM_PARAM_CONSOLE_EVTCHN;
110 1.1 bouyer
111 1.1 bouyer if ( HYPERVISOR_hvm_op(HVMOP_get_param, &xen_hvm_param) < 0)
112 1.1 bouyer panic("xen_pvh_consinit: can't get console event");
113 1.1 bouyer
114 1.1 bouyer xen_start_info.console.domU.evtchn = xen_hvm_param.value;
115 1.1 bouyer xenconscn_attach();
116 1.1 bouyer #endif
117 1.3 bouyer return 1;
118 1.1 bouyer }
119 1.1 bouyer
120 1.1 bouyer static int
121 1.1 bouyer pvh_xenconscn_getc(dev_t dev)
122 1.1 bouyer {
123 1.1 bouyer while(1)
124 1.1 bouyer ;
125 1.1 bouyer return -1;
126 1.1 bouyer }
127 1.1 bouyer
128 1.1 bouyer static void
129 1.1 bouyer pvh_xenconscn_putc(dev_t dev, int c)
130 1.1 bouyer {
131 1.1 bouyer printk("%c", c);
132 1.1 bouyer }
133 1.1 bouyer
134 1.1 bouyer static void
135 1.1 bouyer pvh_xenconscn_pollc(dev_t dev, int on)
136 1.1 bouyer {
137 1.1 bouyer return;
138 1.1 bouyer }
139