| #include <linux/console.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/string.h> |
| #include <linux/screen_info.h> |
| #include <asm/io.h> |
| #include <asm/processor.h> |
| #include <asm/fcntl.h> |
| |
| /* Simple VGA output */ |
| |
| #ifdef __i386__ |
| #include <asm/setup.h> |
| #define VGABASE (__ISA_IO_base + 0xb8000) |
| #else |
| #include <asm/bootsetup.h> |
| #define VGABASE ((void __iomem *)0xffffffff800b8000UL) |
| #endif |
| |
| static int max_ypos = 25, max_xpos = 80; |
| static int current_ypos = 25, current_xpos = 0; |
| |
| static void early_vga_write(struct console *con, const char *str, unsigned n) |
| { |
| char c; |
| int i, k, j; |
| |
| while ((c = *str++) != '\0' && n-- > 0) { |
| if (current_ypos >= max_ypos) { |
| /* scroll 1 line up */ |
| for (k = 1, j = 0; k < max_ypos; k++, j++) { |
| for (i = 0; i < max_xpos; i++) { |
| writew(readw(VGABASE+2*(max_xpos*k+i)), |
| VGABASE + 2*(max_xpos*j + i)); |
| } |
| } |
| for (i = 0; i < max_xpos; i++) |
| writew(0x720, VGABASE + 2*(max_xpos*j + i)); |
| current_ypos = max_ypos-1; |
| } |
| if (c == '\n') { |
| current_xpos = 0; |
| current_ypos++; |
| } else if (c != '\r') { |
| writew(((0x7 << 8) | (unsigned short) c), |
| VGABASE + 2*(max_xpos*current_ypos + |
| current_xpos++)); |
| if (current_xpos >= max_xpos) { |
| current_xpos = 0; |
| current_ypos++; |
| } |
| } |
| } |
| } |
| |
| static struct console early_vga_console = { |
| .name = "earlyvga", |
| .write = early_vga_write, |
| .flags = CON_PRINTBUFFER, |
| .index = -1, |
| }; |
| |
| /* Serial functions loosely based on a similar package from Klaus P. Gerlicher */ |
| |
| static int early_serial_base = 0x3f8; /* ttyS0 */ |
| |
| #define XMTRDY 0x20 |
| |
| #define DLAB 0x80 |
| |
| #define TXR 0 /* Transmit register (WRITE) */ |
| #define RXR 0 /* Receive register (READ) */ |
| #define IER 1 /* Interrupt Enable */ |
| #define IIR 2 /* Interrupt ID */ |
| #define FCR 2 /* FIFO control */ |
| #define LCR 3 /* Line control */ |
| #define MCR 4 /* Modem control */ |
| #define LSR 5 /* Line Status */ |
| #define MSR 6 /* Modem Status */ |
| #define DLL 0 /* Divisor Latch Low */ |
| #define DLH 1 /* Divisor latch High */ |
| |
| static int early_serial_putc(unsigned char ch) |
| { |
| unsigned timeout = 0xffff; |
| while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout) |
| cpu_relax(); |
| outb(ch, early_serial_base + TXR); |
| return timeout ? 0 : -1; |
| } |
| |
| static void early_serial_write(struct console *con, const char *s, unsigned n) |
| { |
| while (*s && n-- > 0) { |
| early_serial_putc(*s); |
| if (*s == '\n') |
| early_serial_putc('\r'); |
| s++; |
| } |
| } |
| |
| #define DEFAULT_BAUD 9600 |
| |
| static __init void early_serial_init(char *s) |
| { |
| unsigned char c; |
| unsigned divisor; |
| unsigned baud = DEFAULT_BAUD; |
| char *e; |
| |
| if (*s == ',') |
| ++s; |
| |
| if (*s) { |
| unsigned port; |
| if (!strncmp(s,"0x",2)) { |
| early_serial_base = simple_strtoul(s, &e, 16); |
| } else { |
| static int bases[] = { 0x3f8, 0x2f8 }; |
| |
| if (!strncmp(s,"ttyS",4)) |
| s += 4; |
| port = simple_strtoul(s, &e, 10); |
| if (port > 1 || s == e) |
| port = 0; |
| early_serial_base = bases[port]; |
| } |
| s += strcspn(s, ","); |
| if (*s == ',') |
| s++; |
| } |
| |
| outb(0x3, early_serial_base + LCR); /* 8n1 */ |
| outb(0, early_serial_base + IER); /* no interrupt */ |
| outb(0, early_serial_base + FCR); /* no fifo */ |
| outb(0x3, early_serial_base + MCR); /* DTR + RTS */ |
| |
| if (*s) { |
| baud = simple_strtoul(s, &e, 0); |
| if (baud == 0 || s == e) |
| baud = DEFAULT_BAUD; |
| } |
| |
| divisor = 115200 / baud; |
| c = inb(early_serial_base + LCR); |
| outb(c | DLAB, early_serial_base + LCR); |
| outb(divisor & 0xff, early_serial_base + DLL); |
| outb((divisor >> 8) & 0xff, early_serial_base + DLH); |
| outb(c & ~DLAB, early_serial_base + LCR); |
| } |
| |
| static struct console early_serial_console = { |
| .name = "earlyser", |
| .write = early_serial_write, |
| .flags = CON_PRINTBUFFER, |
| .index = -1, |
| }; |
| |
| /* Console interface to a host file on AMD's SimNow! */ |
| |
| static int simnow_fd; |
| |
| enum { |
| MAGIC1 = 0xBACCD00A, |
| MAGIC2 = 0xCA110000, |
| XOPEN = 5, |
| XWRITE = 4, |
| }; |
| |
| static noinline long simnow(long cmd, long a, long b, long c) |
| { |
| long ret; |
| asm volatile("cpuid" : |
| "=a" (ret) : |
| "b" (a), "c" (b), "d" (c), "0" (MAGIC1), "D" (cmd + MAGIC2)); |
| return ret; |
| } |
| |
| void __init simnow_init(char *str) |
| { |
| char *fn = "klog"; |
| if (*str == '=') |
| fn = ++str; |
| /* error ignored */ |
| simnow_fd = simnow(XOPEN, (unsigned long)fn, O_WRONLY|O_APPEND|O_CREAT, 0644); |
| } |
| |
| static void simnow_write(struct console *con, const char *s, unsigned n) |
| { |
| simnow(XWRITE, simnow_fd, (unsigned long)s, n); |
| } |
| |
| static struct console simnow_console = { |
| .name = "simnow", |
| .write = simnow_write, |
| .flags = CON_PRINTBUFFER, |
| .index = -1, |
| }; |
| |
| /* Direct interface for emergencies */ |
| struct console *early_console = &early_vga_console; |
| static int early_console_initialized = 0; |
| |
| void early_printk(const char *fmt, ...) |
| { |
| char buf[512]; |
| int n; |
| va_list ap; |
| |
| va_start(ap,fmt); |
| n = vscnprintf(buf,512,fmt,ap); |
| early_console->write(early_console,buf,n); |
| va_end(ap); |
| } |
| |
| static int __initdata keep_early; |
| |
| static int __init setup_early_printk(char *buf) |
| { |
| if (!buf) |
| return 0; |
| |
| if (early_console_initialized) |
| return 0; |
| early_console_initialized = 1; |
| |
| if (!strcmp(buf,"keep")) |
| keep_early = 1; |
| |
| if (!strncmp(buf, "serial", 6)) { |
| early_serial_init(buf + 6); |
| early_console = &early_serial_console; |
| } else if (!strncmp(buf, "ttyS", 4)) { |
| early_serial_init(buf); |
| early_console = &early_serial_console; |
| } else if (!strncmp(buf, "vga", 3) |
| && SCREEN_INFO.orig_video_isVGA == 1) { |
| max_xpos = SCREEN_INFO.orig_video_cols; |
| max_ypos = SCREEN_INFO.orig_video_lines; |
| current_ypos = SCREEN_INFO.orig_y; |
| early_console = &early_vga_console; |
| } else if (!strncmp(buf, "simnow", 6)) { |
| simnow_init(buf + 6); |
| early_console = &simnow_console; |
| keep_early = 1; |
| } |
| register_console(early_console); |
| return 0; |
| } |
| |
| early_param("earlyprintk", setup_early_printk); |
| |
| void __init disable_early_printk(void) |
| { |
| if (!early_console_initialized || !early_console) |
| return; |
| if (!keep_early) { |
| printk("disabling early console\n"); |
| unregister_console(early_console); |
| early_console_initialized = 0; |
| } else { |
| printk("keeping early console\n"); |
| } |
| } |
| |