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 <linux/usb/ch9.h>
7 #include <linux/pci_regs.h>
8 #include <linux/pci_ids.h>
9 #include <linux/errno.h>
11 #include <asm/processor.h>
12 #include <asm/fcntl.h>
13 #include <asm/setup.h>
14 #include <xen/hvc-console.h>
15 #include <asm/pci-direct.h>
16 #include <asm/fixmap.h>
17 #include <asm/pgtable.h>
18 #include <linux/usb/ehci_def.h>
20 /* Simple VGA output */
21 #define VGABASE (__ISA_IO_base + 0xb8000)
23 static int max_ypos = 25, max_xpos = 80;
24 static int current_ypos = 25, current_xpos;
26 static void early_vga_write(struct console *con, const char *str, unsigned n)
31 while ((c = *str++) != '\0' && n-- > 0) {
32 if (current_ypos >= max_ypos) {
33 /* scroll 1 line up */
34 for (k = 1, j = 0; k < max_ypos; k++, j++) {
35 for (i = 0; i < max_xpos; i++) {
36 writew(readw(VGABASE+2*(max_xpos*k+i)),
37 VGABASE + 2*(max_xpos*j + i));
40 for (i = 0; i < max_xpos; i++)
41 writew(0x720, VGABASE + 2*(max_xpos*j + i));
42 current_ypos = max_ypos-1;
44 #ifdef CONFIG_KGDB_KDB
48 } else if (c == '\r') {
55 } else if (c != '\r') {
56 writew(((0x7 << 8) | (unsigned short) c),
57 VGABASE + 2*(max_xpos*current_ypos +
59 if (current_xpos >= max_xpos) {
67 static struct console early_vga_console = {
69 .write = early_vga_write,
70 .flags = CON_PRINTBUFFER,
74 /* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
76 static int early_serial_base = 0x3f8; /* ttyS0 */
82 #define TXR 0 /* Transmit register (WRITE) */
83 #define RXR 0 /* Receive register (READ) */
84 #define IER 1 /* Interrupt Enable */
85 #define IIR 2 /* Interrupt ID */
86 #define FCR 2 /* FIFO control */
87 #define LCR 3 /* Line control */
88 #define MCR 4 /* Modem control */
89 #define LSR 5 /* Line Status */
90 #define MSR 6 /* Modem Status */
91 #define DLL 0 /* Divisor Latch Low */
92 #define DLH 1 /* Divisor latch High */
94 static int early_serial_putc(unsigned char ch)
96 unsigned timeout = 0xffff;
98 while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
100 outb(ch, early_serial_base + TXR);
101 return timeout ? 0 : -1;
104 static void early_serial_write(struct console *con, const char *s, unsigned n)
106 while (*s && n-- > 0) {
108 early_serial_putc('\r');
109 early_serial_putc(*s);
114 #define DEFAULT_BAUD 9600
116 static __init void early_serial_init(char *s)
120 unsigned baud = DEFAULT_BAUD;
128 if (!strncmp(s, "0x", 2)) {
129 early_serial_base = simple_strtoul(s, &e, 16);
131 static const int __initconst bases[] = { 0x3f8, 0x2f8 };
133 if (!strncmp(s, "ttyS", 4))
135 port = simple_strtoul(s, &e, 10);
136 if (port > 1 || s == e)
138 early_serial_base = bases[port];
140 s += strcspn(s, ",");
145 outb(0x3, early_serial_base + LCR); /* 8n1 */
146 outb(0, early_serial_base + IER); /* no interrupt */
147 outb(0, early_serial_base + FCR); /* no fifo */
148 outb(0x3, early_serial_base + MCR); /* DTR + RTS */
151 baud = simple_strtoul(s, &e, 0);
152 if (baud == 0 || s == e)
156 divisor = 115200 / baud;
157 c = inb(early_serial_base + LCR);
158 outb(c | DLAB, early_serial_base + LCR);
159 outb(divisor & 0xff, early_serial_base + DLL);
160 outb((divisor >> 8) & 0xff, early_serial_base + DLH);
161 outb(c & ~DLAB, early_serial_base + LCR);
164 static struct console early_serial_console = {
166 .write = early_serial_write,
167 .flags = CON_PRINTBUFFER,
171 /* Direct interface for emergencies */
172 static struct console *early_console = &early_vga_console;
173 static int __initdata early_console_initialized;
175 asmlinkage void early_printk(const char *fmt, ...)
182 n = vscnprintf(buf, sizeof(buf), fmt, ap);
183 early_console->write(early_console, buf, n);
187 static inline void early_console_register(struct console *con, int keep_early)
189 if (early_console->index != -1) {
190 printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
196 early_console->flags &= ~CON_BOOT;
198 early_console->flags |= CON_BOOT;
199 register_console(early_console);
202 static int __init setup_early_printk(char *buf)
209 if (early_console_initialized)
211 early_console_initialized = 1;
213 keep = (strstr(buf, "keep") != NULL);
215 while (*buf != '\0') {
216 if (!strncmp(buf, "serial", 6)) {
218 early_serial_init(buf);
219 early_console_register(&early_serial_console, keep);
220 if (!strncmp(buf, ",ttyS", 5))
223 if (!strncmp(buf, "ttyS", 4)) {
224 early_serial_init(buf + 4);
225 early_console_register(&early_serial_console, keep);
227 if (!strncmp(buf, "vga", 3) &&
228 boot_params.screen_info.orig_video_isVGA == 1) {
229 max_xpos = boot_params.screen_info.orig_video_cols;
230 max_ypos = boot_params.screen_info.orig_video_lines;
231 current_ypos = boot_params.screen_info.orig_y;
232 early_console_register(&early_vga_console, keep);
234 #ifdef CONFIG_EARLY_PRINTK_DBGP
235 if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
236 early_console_register(&early_dbgp_console, keep);
238 #ifdef CONFIG_HVC_XEN
239 if (!strncmp(buf, "xen", 3))
240 early_console_register(&xenboot_console, keep);
247 early_param("earlyprintk", setup_early_printk);