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>
10 #include <asm/io.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/intel-mid.h>
18 #include <asm/pgtable.h>
19 #include <linux/usb/ehci_def.h>
20 #include <linux/efi.h>
21 #include <asm/efi.h>
22
23 /* Simple VGA output */
24 #define VGABASE (__ISA_IO_base + 0xb8000)
25
26 static int max_ypos = 25, max_xpos = 80;
27 static int current_ypos = 25, current_xpos;
28
early_vga_write(struct console * con,const char * str,unsigned n)29 static void early_vga_write(struct console *con, const char *str, unsigned n)
30 {
31 char c;
32 int i, k, j;
33
34 while ((c = *str++) != '\0' && n-- > 0) {
35 if (current_ypos >= max_ypos) {
36 /* scroll 1 line up */
37 for (k = 1, j = 0; k < max_ypos; k++, j++) {
38 for (i = 0; i < max_xpos; i++) {
39 writew(readw(VGABASE+2*(max_xpos*k+i)),
40 VGABASE + 2*(max_xpos*j + i));
41 }
42 }
43 for (i = 0; i < max_xpos; i++)
44 writew(0x720, VGABASE + 2*(max_xpos*j + i));
45 current_ypos = max_ypos-1;
46 }
47 #ifdef CONFIG_KGDB_KDB
48 if (c == '\b') {
49 if (current_xpos > 0)
50 current_xpos--;
51 } else if (c == '\r') {
52 current_xpos = 0;
53 } else
54 #endif
55 if (c == '\n') {
56 current_xpos = 0;
57 current_ypos++;
58 } else if (c != '\r') {
59 writew(((0x7 << 8) | (unsigned short) c),
60 VGABASE + 2*(max_xpos*current_ypos +
61 current_xpos++));
62 if (current_xpos >= max_xpos) {
63 current_xpos = 0;
64 current_ypos++;
65 }
66 }
67 }
68 }
69
70 static struct console early_vga_console = {
71 .name = "earlyvga",
72 .write = early_vga_write,
73 .flags = CON_PRINTBUFFER,
74 .index = -1,
75 };
76
77 /* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
78
79 static int early_serial_base = 0x3f8; /* ttyS0 */
80
81 #define XMTRDY 0x20
82
83 #define DLAB 0x80
84
85 #define TXR 0 /* Transmit register (WRITE) */
86 #define RXR 0 /* Receive register (READ) */
87 #define IER 1 /* Interrupt Enable */
88 #define IIR 2 /* Interrupt ID */
89 #define FCR 2 /* FIFO control */
90 #define LCR 3 /* Line control */
91 #define MCR 4 /* Modem control */
92 #define LSR 5 /* Line Status */
93 #define MSR 6 /* Modem Status */
94 #define DLL 0 /* Divisor Latch Low */
95 #define DLH 1 /* Divisor latch High */
96
early_serial_putc(unsigned char ch)97 static int early_serial_putc(unsigned char ch)
98 {
99 unsigned timeout = 0xffff;
100
101 while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
102 cpu_relax();
103 outb(ch, early_serial_base + TXR);
104 return timeout ? 0 : -1;
105 }
106
early_serial_write(struct console * con,const char * s,unsigned n)107 static void early_serial_write(struct console *con, const char *s, unsigned n)
108 {
109 while (*s && n-- > 0) {
110 if (*s == '\n')
111 early_serial_putc('\r');
112 early_serial_putc(*s);
113 s++;
114 }
115 }
116
117 #define DEFAULT_BAUD 9600
118
early_serial_init(char * s)119 static __init void early_serial_init(char *s)
120 {
121 unsigned char c;
122 unsigned divisor;
123 unsigned baud = DEFAULT_BAUD;
124 char *e;
125
126 if (*s == ',')
127 ++s;
128
129 if (*s) {
130 unsigned port;
131 if (!strncmp(s, "0x", 2)) {
132 early_serial_base = simple_strtoul(s, &e, 16);
133 } else {
134 static const int __initconst bases[] = { 0x3f8, 0x2f8 };
135
136 if (!strncmp(s, "ttyS", 4))
137 s += 4;
138 port = simple_strtoul(s, &e, 10);
139 if (port > 1 || s == e)
140 port = 0;
141 early_serial_base = bases[port];
142 }
143 s += strcspn(s, ",");
144 if (*s == ',')
145 s++;
146 }
147
148 outb(0x3, early_serial_base + LCR); /* 8n1 */
149 outb(0, early_serial_base + IER); /* no interrupt */
150 outb(0, early_serial_base + FCR); /* no fifo */
151 outb(0x3, early_serial_base + MCR); /* DTR + RTS */
152
153 if (*s) {
154 baud = simple_strtoul(s, &e, 0);
155 if (baud == 0 || s == e)
156 baud = DEFAULT_BAUD;
157 }
158
159 divisor = 115200 / baud;
160 c = inb(early_serial_base + LCR);
161 outb(c | DLAB, early_serial_base + LCR);
162 outb(divisor & 0xff, early_serial_base + DLL);
163 outb((divisor >> 8) & 0xff, early_serial_base + DLH);
164 outb(c & ~DLAB, early_serial_base + LCR);
165 }
166
167 static struct console early_serial_console = {
168 .name = "earlyser",
169 .write = early_serial_write,
170 .flags = CON_PRINTBUFFER,
171 .index = -1,
172 };
173
early_console_register(struct console * con,int keep_early)174 static inline void early_console_register(struct console *con, int keep_early)
175 {
176 if (con->index != -1) {
177 printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
178 con->name);
179 return;
180 }
181 early_console = con;
182 if (keep_early)
183 early_console->flags &= ~CON_BOOT;
184 else
185 early_console->flags |= CON_BOOT;
186 register_console(early_console);
187 }
188
setup_early_printk(char * buf)189 static int __init setup_early_printk(char *buf)
190 {
191 int keep;
192
193 if (!buf)
194 return 0;
195
196 if (early_console)
197 return 0;
198
199 keep = (strstr(buf, "keep") != NULL);
200
201 while (*buf != '\0') {
202 if (!strncmp(buf, "serial", 6)) {
203 buf += 6;
204 early_serial_init(buf);
205 early_console_register(&early_serial_console, keep);
206 if (!strncmp(buf, ",ttyS", 5))
207 buf += 5;
208 }
209 if (!strncmp(buf, "ttyS", 4)) {
210 early_serial_init(buf + 4);
211 early_console_register(&early_serial_console, keep);
212 }
213 if (!strncmp(buf, "vga", 3) &&
214 boot_params.screen_info.orig_video_isVGA == 1) {
215 max_xpos = boot_params.screen_info.orig_video_cols;
216 max_ypos = boot_params.screen_info.orig_video_lines;
217 current_ypos = boot_params.screen_info.orig_y;
218 early_console_register(&early_vga_console, keep);
219 }
220 #ifdef CONFIG_EARLY_PRINTK_DBGP
221 if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
222 early_console_register(&early_dbgp_console, keep);
223 #endif
224 #ifdef CONFIG_HVC_XEN
225 if (!strncmp(buf, "xen", 3))
226 early_console_register(&xenboot_console, keep);
227 #endif
228 #ifdef CONFIG_EARLY_PRINTK_INTEL_MID
229 if (!strncmp(buf, "mrst", 4)) {
230 mrst_early_console_init();
231 early_console_register(&early_mrst_console, keep);
232 }
233
234 if (!strncmp(buf, "hsu", 3)) {
235 hsu_early_console_init(buf + 3);
236 early_console_register(&early_hsu_console, keep);
237 }
238 #endif
239 #ifdef CONFIG_EARLY_PRINTK_EFI
240 if (!strncmp(buf, "efi", 3))
241 early_console_register(&early_efi_console, keep);
242 #endif
243
244 buf++;
245 }
246 return 0;
247 }
248
249 early_param("earlyprintk", setup_early_printk);
250