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/mrst.h> 18 #include <asm/pgtable.h> 19 #include <linux/usb/ehci_def.h> 20 21 /* Simple VGA output */ 22 #define VGABASE (__ISA_IO_base + 0xb8000) 23 24 static int max_ypos = 25, max_xpos = 80; 25 static int current_ypos = 25, current_xpos; 26 27 static void early_vga_write(struct console *con, const char *str, unsigned n) 28 { 29 char c; 30 int i, k, j; 31 32 while ((c = *str++) != '\0' && n-- > 0) { 33 if (current_ypos >= max_ypos) { 34 /* scroll 1 line up */ 35 for (k = 1, j = 0; k < max_ypos; k++, j++) { 36 for (i = 0; i < max_xpos; i++) { 37 writew(readw(VGABASE+2*(max_xpos*k+i)), 38 VGABASE + 2*(max_xpos*j + i)); 39 } 40 } 41 for (i = 0; i < max_xpos; i++) 42 writew(0x720, VGABASE + 2*(max_xpos*j + i)); 43 current_ypos = max_ypos-1; 44 } 45 #ifdef CONFIG_KGDB_KDB 46 if (c == '\b') { 47 if (current_xpos > 0) 48 current_xpos--; 49 } else if (c == '\r') { 50 current_xpos = 0; 51 } else 52 #endif 53 if (c == '\n') { 54 current_xpos = 0; 55 current_ypos++; 56 } else if (c != '\r') { 57 writew(((0x7 << 8) | (unsigned short) c), 58 VGABASE + 2*(max_xpos*current_ypos + 59 current_xpos++)); 60 if (current_xpos >= max_xpos) { 61 current_xpos = 0; 62 current_ypos++; 63 } 64 } 65 } 66 } 67 68 static struct console early_vga_console = { 69 .name = "earlyvga", 70 .write = early_vga_write, 71 .flags = CON_PRINTBUFFER, 72 .index = -1, 73 }; 74 75 /* Serial functions loosely based on a similar package from Klaus P. Gerlicher */ 76 77 static int early_serial_base = 0x3f8; /* ttyS0 */ 78 79 #define XMTRDY 0x20 80 81 #define DLAB 0x80 82 83 #define TXR 0 /* Transmit register (WRITE) */ 84 #define RXR 0 /* Receive register (READ) */ 85 #define IER 1 /* Interrupt Enable */ 86 #define IIR 2 /* Interrupt ID */ 87 #define FCR 2 /* FIFO control */ 88 #define LCR 3 /* Line control */ 89 #define MCR 4 /* Modem control */ 90 #define LSR 5 /* Line Status */ 91 #define MSR 6 /* Modem Status */ 92 #define DLL 0 /* Divisor Latch Low */ 93 #define DLH 1 /* Divisor latch High */ 94 95 static int early_serial_putc(unsigned char ch) 96 { 97 unsigned timeout = 0xffff; 98 99 while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout) 100 cpu_relax(); 101 outb(ch, early_serial_base + TXR); 102 return timeout ? 0 : -1; 103 } 104 105 static void early_serial_write(struct console *con, const char *s, unsigned n) 106 { 107 while (*s && n-- > 0) { 108 if (*s == '\n') 109 early_serial_putc('\r'); 110 early_serial_putc(*s); 111 s++; 112 } 113 } 114 115 #define DEFAULT_BAUD 9600 116 117 static __init void early_serial_init(char *s) 118 { 119 unsigned char c; 120 unsigned divisor; 121 unsigned baud = DEFAULT_BAUD; 122 char *e; 123 124 if (*s == ',') 125 ++s; 126 127 if (*s) { 128 unsigned port; 129 if (!strncmp(s, "0x", 2)) { 130 early_serial_base = simple_strtoul(s, &e, 16); 131 } else { 132 static const int __initconst bases[] = { 0x3f8, 0x2f8 }; 133 134 if (!strncmp(s, "ttyS", 4)) 135 s += 4; 136 port = simple_strtoul(s, &e, 10); 137 if (port > 1 || s == e) 138 port = 0; 139 early_serial_base = bases[port]; 140 } 141 s += strcspn(s, ","); 142 if (*s == ',') 143 s++; 144 } 145 146 outb(0x3, early_serial_base + LCR); /* 8n1 */ 147 outb(0, early_serial_base + IER); /* no interrupt */ 148 outb(0, early_serial_base + FCR); /* no fifo */ 149 outb(0x3, early_serial_base + MCR); /* DTR + RTS */ 150 151 if (*s) { 152 baud = simple_strtoul(s, &e, 0); 153 if (baud == 0 || s == e) 154 baud = DEFAULT_BAUD; 155 } 156 157 divisor = 115200 / baud; 158 c = inb(early_serial_base + LCR); 159 outb(c | DLAB, early_serial_base + LCR); 160 outb(divisor & 0xff, early_serial_base + DLL); 161 outb((divisor >> 8) & 0xff, early_serial_base + DLH); 162 outb(c & ~DLAB, early_serial_base + LCR); 163 } 164 165 static struct console early_serial_console = { 166 .name = "earlyser", 167 .write = early_serial_write, 168 .flags = CON_PRINTBUFFER, 169 .index = -1, 170 }; 171 172 /* Direct interface for emergencies */ 173 static struct console *early_console = &early_vga_console; 174 static int __initdata early_console_initialized; 175 176 asmlinkage void early_printk(const char *fmt, ...) 177 { 178 char buf[512]; 179 int n; 180 va_list ap; 181 182 va_start(ap, fmt); 183 n = vscnprintf(buf, sizeof(buf), fmt, ap); 184 early_console->write(early_console, buf, n); 185 va_end(ap); 186 } 187 188 static inline void early_console_register(struct console *con, int keep_early) 189 { 190 if (early_console->index != -1) { 191 printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n", 192 con->name); 193 return; 194 } 195 early_console = con; 196 if (keep_early) 197 early_console->flags &= ~CON_BOOT; 198 else 199 early_console->flags |= CON_BOOT; 200 register_console(early_console); 201 } 202 203 static int __init setup_early_printk(char *buf) 204 { 205 int keep; 206 207 if (!buf) 208 return 0; 209 210 if (early_console_initialized) 211 return 0; 212 early_console_initialized = 1; 213 214 keep = (strstr(buf, "keep") != NULL); 215 216 while (*buf != '\0') { 217 if (!strncmp(buf, "serial", 6)) { 218 buf += 6; 219 early_serial_init(buf); 220 early_console_register(&early_serial_console, keep); 221 if (!strncmp(buf, ",ttyS", 5)) 222 buf += 5; 223 } 224 if (!strncmp(buf, "ttyS", 4)) { 225 early_serial_init(buf + 4); 226 early_console_register(&early_serial_console, keep); 227 } 228 if (!strncmp(buf, "vga", 3) && 229 boot_params.screen_info.orig_video_isVGA == 1) { 230 max_xpos = boot_params.screen_info.orig_video_cols; 231 max_ypos = boot_params.screen_info.orig_video_lines; 232 current_ypos = boot_params.screen_info.orig_y; 233 early_console_register(&early_vga_console, keep); 234 } 235 #ifdef CONFIG_EARLY_PRINTK_DBGP 236 if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4)) 237 early_console_register(&early_dbgp_console, keep); 238 #endif 239 #ifdef CONFIG_HVC_XEN 240 if (!strncmp(buf, "xen", 3)) 241 early_console_register(&xenboot_console, keep); 242 #endif 243 #ifdef CONFIG_EARLY_PRINTK_MRST 244 if (!strncmp(buf, "mrst", 4)) { 245 mrst_early_console_init(); 246 early_console_register(&early_mrst_console, keep); 247 } 248 249 if (!strncmp(buf, "hsu", 3)) { 250 hsu_early_console_init(); 251 early_console_register(&early_hsu_console, keep); 252 } 253 #endif 254 buf++; 255 } 256 return 0; 257 } 258 259 early_param("earlyprintk", setup_early_printk); 260