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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 05:17:24 -0400
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 05:17:24 -0400
commit250c22777fe1ccd7ac588579a6c16db4c0161cc5 (patch)
tree55c317efb7d792ec6fdae1d1937c67a502c48dec /arch/x86_64/kernel/early_printk.c
parent2db55d344e529492545cb3b755c7e9ba8e4fa94e (diff)
x86_64: move kernel
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86_64/kernel/early_printk.c')
-rw-r--r--arch/x86_64/kernel/early_printk.c259
1 files changed, 0 insertions, 259 deletions
diff --git a/arch/x86_64/kernel/early_printk.c b/arch/x86_64/kernel/early_printk.c
deleted file mode 100644
index fd9aff3f3890..000000000000
--- a/arch/x86_64/kernel/early_printk.c
+++ /dev/null
@@ -1,259 +0,0 @@
1#include <linux/console.h>
2#include <linux/kernel.h>
3#include <linux/init.h>
4#include <linux/string.h>
5#include <linux/screen_info.h>
6#include <asm/io.h>
7#include <asm/processor.h>
8#include <asm/fcntl.h>
9#include <xen/hvc-console.h>
10
11/* Simple VGA output */
12
13#ifdef __i386__
14#include <asm/setup.h>
15#else
16#include <asm/bootsetup.h>
17#endif
18#define VGABASE (__ISA_IO_base + 0xb8000)
19
20static int max_ypos = 25, max_xpos = 80;
21static int current_ypos = 25, current_xpos = 0;
22
23static void early_vga_write(struct console *con, const char *str, unsigned n)
24{
25 char c;
26 int i, k, j;
27
28 while ((c = *str++) != '\0' && n-- > 0) {
29 if (current_ypos >= max_ypos) {
30 /* scroll 1 line up */
31 for (k = 1, j = 0; k < max_ypos; k++, j++) {
32 for (i = 0; i < max_xpos; i++) {
33 writew(readw(VGABASE+2*(max_xpos*k+i)),
34 VGABASE + 2*(max_xpos*j + i));
35 }
36 }
37 for (i = 0; i < max_xpos; i++)
38 writew(0x720, VGABASE + 2*(max_xpos*j + i));
39 current_ypos = max_ypos-1;
40 }
41 if (c == '\n') {
42 current_xpos = 0;
43 current_ypos++;
44 } else if (c != '\r') {
45 writew(((0x7 << 8) | (unsigned short) c),
46 VGABASE + 2*(max_xpos*current_ypos +
47 current_xpos++));
48 if (current_xpos >= max_xpos) {
49 current_xpos = 0;
50 current_ypos++;
51 }
52 }
53 }
54}
55
56static struct console early_vga_console = {
57 .name = "earlyvga",
58 .write = early_vga_write,
59 .flags = CON_PRINTBUFFER,
60 .index = -1,
61};
62
63/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
64
65static int early_serial_base = 0x3f8; /* ttyS0 */
66
67#define XMTRDY 0x20
68
69#define DLAB 0x80
70
71#define TXR 0 /* Transmit register (WRITE) */
72#define RXR 0 /* Receive register (READ) */
73#define IER 1 /* Interrupt Enable */
74#define IIR 2 /* Interrupt ID */
75#define FCR 2 /* FIFO control */
76#define LCR 3 /* Line control */
77#define MCR 4 /* Modem control */
78#define LSR 5 /* Line Status */
79#define MSR 6 /* Modem Status */
80#define DLL 0 /* Divisor Latch Low */
81#define DLH 1 /* Divisor latch High */
82
83static int early_serial_putc(unsigned char ch)
84{
85 unsigned timeout = 0xffff;
86 while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
87 cpu_relax();
88 outb(ch, early_serial_base + TXR);
89 return timeout ? 0 : -1;
90}
91
92static void early_serial_write(struct console *con, const char *s, unsigned n)
93{
94 while (*s && n-- > 0) {
95 if (*s == '\n')
96 early_serial_putc('\r');
97 early_serial_putc(*s);
98 s++;
99 }
100}
101
102#define DEFAULT_BAUD 9600
103
104static __init void early_serial_init(char *s)
105{
106 unsigned char c;
107 unsigned divisor;
108 unsigned baud = DEFAULT_BAUD;
109 char *e;
110
111 if (*s == ',')
112 ++s;
113
114 if (*s) {
115 unsigned port;
116 if (!strncmp(s,"0x",2)) {
117 early_serial_base = simple_strtoul(s, &e, 16);
118 } else {
119 static int bases[] = { 0x3f8, 0x2f8 };
120
121 if (!strncmp(s,"ttyS",4))
122 s += 4;
123 port = simple_strtoul(s, &e, 10);
124 if (port > 1 || s == e)
125 port = 0;
126 early_serial_base = bases[port];
127 }
128 s += strcspn(s, ",");
129 if (*s == ',')
130 s++;
131 }
132
133 outb(0x3, early_serial_base + LCR); /* 8n1 */
134 outb(0, early_serial_base + IER); /* no interrupt */
135 outb(0, early_serial_base + FCR); /* no fifo */
136 outb(0x3, early_serial_base + MCR); /* DTR + RTS */
137
138 if (*s) {
139 baud = simple_strtoul(s, &e, 0);
140 if (baud == 0 || s == e)
141 baud = DEFAULT_BAUD;
142 }
143
144 divisor = 115200 / baud;
145 c = inb(early_serial_base + LCR);
146 outb(c | DLAB, early_serial_base + LCR);
147 outb(divisor & 0xff, early_serial_base + DLL);
148 outb((divisor >> 8) & 0xff, early_serial_base + DLH);
149 outb(c & ~DLAB, early_serial_base + LCR);
150}
151
152static struct console early_serial_console = {
153 .name = "earlyser",
154 .write = early_serial_write,
155 .flags = CON_PRINTBUFFER,
156 .index = -1,
157};
158
159/* Console interface to a host file on AMD's SimNow! */
160
161static int simnow_fd;
162
163enum {
164 MAGIC1 = 0xBACCD00A,
165 MAGIC2 = 0xCA110000,
166 XOPEN = 5,
167 XWRITE = 4,
168};
169
170static noinline long simnow(long cmd, long a, long b, long c)
171{
172 long ret;
173 asm volatile("cpuid" :
174 "=a" (ret) :
175 "b" (a), "c" (b), "d" (c), "0" (MAGIC1), "D" (cmd + MAGIC2));
176 return ret;
177}
178
179static void __init simnow_init(char *str)
180{
181 char *fn = "klog";
182 if (*str == '=')
183 fn = ++str;
184 /* error ignored */
185 simnow_fd = simnow(XOPEN, (unsigned long)fn, O_WRONLY|O_APPEND|O_CREAT, 0644);
186}
187
188static void simnow_write(struct console *con, const char *s, unsigned n)
189{
190 simnow(XWRITE, simnow_fd, (unsigned long)s, n);
191}
192
193static struct console simnow_console = {
194 .name = "simnow",
195 .write = simnow_write,
196 .flags = CON_PRINTBUFFER,
197 .index = -1,
198};
199
200/* Direct interface for emergencies */
201struct console *early_console = &early_vga_console;
202static int early_console_initialized = 0;
203
204void early_printk(const char *fmt, ...)
205{
206 char buf[512];
207 int n;
208 va_list ap;
209
210 va_start(ap,fmt);
211 n = vscnprintf(buf,512,fmt,ap);
212 early_console->write(early_console,buf,n);
213 va_end(ap);
214}
215
216static int __initdata keep_early;
217
218static int __init setup_early_printk(char *buf)
219{
220 if (!buf)
221 return 0;
222
223 if (early_console_initialized)
224 return 0;
225 early_console_initialized = 1;
226
227 if (strstr(buf, "keep"))
228 keep_early = 1;
229
230 if (!strncmp(buf, "serial", 6)) {
231 early_serial_init(buf + 6);
232 early_console = &early_serial_console;
233 } else if (!strncmp(buf, "ttyS", 4)) {
234 early_serial_init(buf);
235 early_console = &early_serial_console;
236 } else if (!strncmp(buf, "vga", 3)
237 && SCREEN_INFO.orig_video_isVGA == 1) {
238 max_xpos = SCREEN_INFO.orig_video_cols;
239 max_ypos = SCREEN_INFO.orig_video_lines;
240 current_ypos = SCREEN_INFO.orig_y;
241 early_console = &early_vga_console;
242 } else if (!strncmp(buf, "simnow", 6)) {
243 simnow_init(buf + 6);
244 early_console = &simnow_console;
245 keep_early = 1;
246#ifdef CONFIG_HVC_XEN
247 } else if (!strncmp(buf, "xen", 3)) {
248 early_console = &xenboot_console;
249#endif
250 }
251
252 if (keep_early)
253 early_console->flags &= ~CON_BOOT;
254 else
255 early_console->flags |= CON_BOOT;
256 register_console(early_console);
257 return 0;
258}
259early_param("earlyprintk", setup_early_printk);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-19 07:22:53 -0500