1 /*-
2 * Copyright (c) 2004 Hidetoshi Shimokawa
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
29 #include <stand.h>
30 #include <bootstrap.h>
31 #include <sys/param.h>
32 #include <btxv86.h>
33 #include <dev/dcons/dcons.h>
34
35 void fw_enable(void);
36 void fw_poll(void);
37
38 static void dconsole_probe(struct console *cp);
39 static int dconsole_init(int arg);
40 static void dconsole_putchar(int c);
41 static int dconsole_getchar(void);
42 static int dconsole_ischar(void);
43
44 static int dcons_started = 0;
45
46 #define DCONS_BUF_SIZE (64*1024)
47 static struct dcons_softc sc[DCONS_NPORT];
48 uint32_t dcons_paddr;
49
50 /* The buffer must be allocated in BSS because:
51 * - The dcons driver in the kernel is initialized before VM/pmap is
52 * initialized, so that the buffer must be allocated in the region
53 * that is mapped at the very early boot state.
54 * - We expect identity map only for regions before KERNLOAD
55 * (i386:4MB amd64:1MB).
56 * - It seems that heap in conventional memory(640KB) is not sufficient
57 * and we move it to high address as LOADER_SUPPORT_BZIP2.
58 * - BSS is placed in conventional memory.
59 */
60 static char dcons_buffer[DCONS_BUF_SIZE + PAGE_SIZE];
61
62 struct console dconsole = {
63 .c_name = "dcons",
64 .c_desc = "dumb console port",
65 .c_flags = 0,
66 .c_probe = dconsole_probe,
67 .c_init = dconsole_init,
68 .c_out = dconsole_putchar,
69 .c_in = dconsole_getchar,
70 .c_ready = dconsole_ischar,
71 .c_private = NULL
72 };
73
74 #define DCONSOLE_AS_MULTI_CONSOLE 1
75
76 static void
dconsole_probe(struct console * cp)77 dconsole_probe(struct console *cp)
78 {
79 /* XXX check the BIOS equipment list? */
80 cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
81 #if DCONSOLE_AS_MULTI_CONSOLE
82 dconsole_init(0);
83 cp->c_flags |= (C_ACTIVEIN | C_ACTIVEOUT);
84 #endif
85 }
86
87 static int
dconsole_init(int arg)88 dconsole_init(int arg)
89 {
90 char buf[16], *dbuf;
91 int size;
92
93 if (dcons_started && arg == 0)
94 return 0;
95 dcons_started = 1;
96
97 size = DCONS_BUF_SIZE;
98 dbuf = (char *)round_page((vm_offset_t)&dcons_buffer[0]);
99 dcons_paddr = VTOP(dbuf);
100 sprintf(buf, "0x%08x", dcons_paddr);
101 setenv("dcons.addr", buf, 1);
102
103 dcons_init((struct dcons_buf *)dbuf, size, sc);
104 sprintf(buf, "%d", size);
105 setenv("dcons.size", buf, 1);
106 fw_enable();
107 return(0);
108 }
109
110 static void
dconsole_putchar(int c)111 dconsole_putchar(int c)
112 {
113 dcons_putc(&sc[0], c);
114 }
115
116 static int
dconsole_getchar(void)117 dconsole_getchar(void)
118 {
119 fw_poll();
120 return (dcons_checkc(&sc[0]));
121 }
122
123 static int
dconsole_ischar(void)124 dconsole_ischar(void)
125 {
126 fw_poll();
127 return (dcons_ischar(&sc[0]));
128 }
129