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 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 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 } 106 107 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 118 119 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 }; 173 174 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 } 188 189 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