1 /* $NetBSD: genfb_machdep.c,v 1.23 2023/10/19 14:59:46 bouyer Exp $ */
2 
3 /*-
4  * Copyright (c) 2009 Jared D. McNeill <jmcneill@invisible.ca>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26  * POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 /*
30  * Early attach support for raster consoles
31  */
32 
33 #include <sys/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: genfb_machdep.c,v 1.23 2023/10/19 14:59:46 bouyer Exp $");
35 
36 #include <sys/param.h>
37 #include <sys/conf.h>
38 #include <sys/device.h>
39 #include <sys/ioctl.h>
40 #include <sys/kernel.h>
41 #include <sys/kmem.h>
42 #include <sys/lwp.h>
43 
44 #include <sys/bus.h>
45 #include <machine/bootinfo.h>
46 
47 #include <dev/wscons/wsconsio.h>
48 #include <dev/wscons/wsdisplayvar.h>
49 #include <dev/rasops/rasops.h>
50 #include <dev/wsfont/wsfont.h>
51 #include <dev/wscons/wsdisplay_vconsvar.h>
52 
53 #include <dev/wsfb/genfbvar.h>
54 #include <arch/x86/include/genfb_machdep.h>
55 #include <arch/xen/include/hypervisor.h>
56 #include <arch/xen/include/xen.h>
57 
58 #include "wsdisplay.h"
59 #include "genfb.h"
60 #include "acpica.h"
61 #include "opt_xen.h"
62 
63 #if NWSDISPLAY > 0 && NGENFB > 0
64 struct vcons_screen x86_genfb_console_screen;
65 bool x86_genfb_use_shadowfb = true;
66 
67 static device_t x86_genfb_console_dev = NULL;
68 
69 static struct wsscreen_descr x86_genfb_stdscreen = {
70           "std",
71           0, 0,
72           0,
73           0, 0,
74           0,
75           NULL
76 };
77 
78 void
x86_genfb_set_console_dev(device_t dev)79 x86_genfb_set_console_dev(device_t dev)
80 {
81           KASSERT(x86_genfb_console_dev == NULL);
82           x86_genfb_console_dev = dev;
83 }
84 
85 void
x86_genfb_ddb_trap_callback(int where)86 x86_genfb_ddb_trap_callback(int where)
87 {
88           if (x86_genfb_console_dev == NULL)
89                     return;
90 
91           if (where) {
92                     genfb_enable_polling(x86_genfb_console_dev);
93           } else {
94                     genfb_disable_polling(x86_genfb_console_dev);
95           }
96 }
97 
98 int
x86_genfb_init(void)99 x86_genfb_init(void)
100 {
101           static int inited, attached;
102           struct rasops_info *ri = &x86_genfb_console_screen.scr_ri;
103           const struct btinfo_framebuffer *fbinfo = NULL;
104           bus_space_tag_t t = x86_bus_space_mem;
105           bus_space_handle_t h;
106           void *bits;
107           int err;
108 
109           if (inited)
110                     return attached;
111           inited = 1;
112 
113           memset(&x86_genfb_console_screen, 0, sizeof(x86_genfb_console_screen));
114 
115 #if defined(XEN) && defined(DOM0OPS)
116           if ((vm_guest == VM_GUEST_XENPVH || vm_guest == VM_GUEST_XENPV) &&
117               xendomain_is_dom0())
118                     fbinfo = xen_genfb_getbtinfo();
119 #endif
120           if (fbinfo == NULL)
121                     fbinfo = lookup_bootinfo(BTINFO_FRAMEBUFFER);
122 
123           if (fbinfo == NULL || fbinfo->physaddr == 0)
124                     return 0;
125 
126           err = _x86_memio_map(t, (bus_addr_t)fbinfo->physaddr,
127               fbinfo->height * fbinfo->stride,
128               BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE, &h);
129           if (err) {
130                     aprint_error("x86_genfb_cnattach: couldn't map framebuffer\n");
131                     return 0;
132           }
133 
134           bits = bus_space_vaddr(t, h);
135           if (bits == NULL) {
136                     aprint_error("x86_genfb_cnattach: couldn't get fb vaddr\n");
137                     return 0;
138           }
139 
140 #if NACPICA > 0 && !defined(XENPV)
141           acpi_md_vesa_modenum = fbinfo->vbemode;
142 #endif
143 
144           wsfont_init();
145 
146           ri->ri_width = fbinfo->width;
147           ri->ri_height = fbinfo->height;
148           ri->ri_depth = fbinfo->depth;
149           ri->ri_stride = fbinfo->stride;
150           ri->ri_rnum = fbinfo->rnum;
151           ri->ri_gnum = fbinfo->gnum;
152           ri->ri_bnum = fbinfo->bnum;
153           ri->ri_rpos = fbinfo->rpos;
154           ri->ri_gpos = fbinfo->gpos;
155           ri->ri_bpos = fbinfo->bpos;
156           if (x86_genfb_use_shadowfb && lookup_bootinfo(BTINFO_EFI) != NULL) {
157                     /* XXX The allocated memory is never released... */
158                     ri->ri_bits = kmem_alloc(ri->ri_stride * ri->ri_height,
159                         KM_SLEEP);
160                     ri->ri_hwbits = bits;
161           } else
162                     ri->ri_bits = bits;
163           ri->ri_flg = RI_CENTER | RI_FULLCLEAR | RI_CLEAR;
164           rasops_init(ri, ri->ri_height / 8, ri->ri_width / 8);
165           ri->ri_caps = WSSCREEN_WSCOLORS;
166           rasops_reconfig(ri, ri->ri_height / ri->ri_font->fontheight,
167               ri->ri_width / ri->ri_font->fontwidth);
168 
169           x86_genfb_stdscreen.nrows = ri->ri_rows;
170           x86_genfb_stdscreen.ncols = ri->ri_cols;
171           x86_genfb_stdscreen.textops = &ri->ri_ops;
172           x86_genfb_stdscreen.capabilities = ri->ri_caps;
173 
174           attached = 1;
175           return 1;
176 }
177 
178 int
x86_genfb_cnattach(void)179 x86_genfb_cnattach(void)
180 {
181           static int ncalls = 0;
182           struct rasops_info *ri = &x86_genfb_console_screen.scr_ri;
183           long defattr;
184 
185           /* XXX jmcneill
186            *  Defer console initialization until UVM is initialized
187            */
188           ++ncalls;
189           if (ncalls < 3)
190                     return -1;
191 
192           if (!x86_genfb_init())
193                     return 0;
194 
195           ri->ri_ops.allocattr(ri, 0, 0, 0, &defattr);
196           wsdisplay_preattach(&x86_genfb_stdscreen, ri, 0, 0, defattr);
197 
198           return 1;
199 }
200 #else     /* NWSDISPLAY > 0 && NGENFB > 0 */
201 int
x86_genfb_init(void)202 x86_genfb_init(void)
203 {
204           return 0;
205 }
206 
207 int
x86_genfb_cnattach(void)208 x86_genfb_cnattach(void)
209 {
210           return 0;
211 }
212 #endif
213