| #include <linux/console.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/string.h> |
| #include <linux/screen_info.h> |
| #include <linux/usb/ch9.h> |
| #include <linux/pci_regs.h> |
| #include <linux/pci_ids.h> |
| #include <linux/errno.h> |
| #include <asm/io.h> |
| #include <asm/processor.h> |
| #include <asm/fcntl.h> |
| #include <asm/setup.h> |
| #include <xen/hvc-console.h> |
| #include <asm/pci-direct.h> |
| #include <asm/fixmap.h> |
| #include <asm/mrst.h> |
| #include <asm/pgtable.h> |
| #include <linux/usb/ehci_def.h> |
| |
| /* Simple VGA output */ |
| #define VGABASE (__ISA_IO_base + 0xb8000) |
| |
| static int max_ypos = 25, max_xpos = 80; |
| static int current_ypos = 25, current_xpos; |
| |
| 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; |
| } |
| #ifdef CONFIG_KGDB_KDB |
| if (c == '\b') { |
| if (current_xpos > 0) |
| current_xpos--; |
| } else if (c == '\r') { |
| current_xpos = 0; |
| } else |
| #endif |
| 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) { |
| if (*s == '\n') |
| early_serial_putc('\r'); |
| early_serial_putc(*s); |
| 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 const int __initconst 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, |
| }; |
| |
| /* Direct interface for emergencies */ |
| static struct console *early_console = &early_vga_console; |
| static int __initdata early_console_initialized; |
| |
| asmlinkage void early_printk(const char *fmt, ...) |
| { |
| char buf[512]; |
| int n; |
| va_list ap; |
| |
| va_start(ap, fmt); |
| n = vscnprintf(buf, sizeof(buf), fmt, ap); |
| early_console->write(early_console, buf, n); |
| va_end(ap); |
| } |
| |
| static inline void early_console_register(struct console *con, int keep_early) |
| { |
| if (early_console->index != -1) { |
| printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n", |
| con->name); |
| return; |
| } |
| early_console = con; |
| if (keep_early) |
| early_console->flags &= ~CON_BOOT; |
| else |
| early_console->flags |= CON_BOOT; |
| register_console(early_console); |
| } |
| |
| static int __init setup_early_printk(char *buf) |
| { |
| int keep; |
| |
| if (!buf) |
| return 0; |
| |
| if (early_console_initialized) |
| return 0; |
| early_console_initialized = 1; |
| |
| keep = (strstr(buf, "keep") != NULL); |
| |
| while (*buf != '\0') { |
| if (!strncmp(buf, "serial", 6)) { |
| buf += 6; |
| early_serial_init(buf); |
| early_console_register(&early_serial_console, keep); |
| if (!strncmp(buf, ",ttyS", 5)) |
| buf += 5; |
| } |
| if (!strncmp(buf, "ttyS", 4)) { |
| early_serial_init(buf + 4); |
| early_console_register(&early_serial_console, keep); |
| } |
| if (!strncmp(buf, "vga", 3) && |
| boot_params.screen_info.orig_video_isVGA == 1) { |
| max_xpos = boot_params.screen_info.orig_video_cols; |
| max_ypos = boot_params.screen_info.orig_video_lines; |
| current_ypos = boot_params.screen_info.orig_y; |
| early_console_register(&early_vga_console, keep); |
| } |
| #ifdef CONFIG_EARLY_PRINTK_DBGP |
| if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4)) |
| early_console_register(&early_dbgp_console, keep); |
| #endif |
| #ifdef CONFIG_HVC_XEN |
| if (!strncmp(buf, "xen", 3)) |
| early_console_register(&xenboot_console, keep); |
| #endif |
| #ifdef CONFIG_EARLY_PRINTK_MRST |
| if (!strncmp(buf, "mrst", 4)) { |
| mrst_early_console_init(); |
| early_console_register(&early_mrst_console, keep); |
| } |
| |
| if (!strncmp(buf, "hsu", 3)) { |
| hsu_early_console_init(buf + 3); |
| early_console_register(&early_hsu_console, keep); |
| } |
| #endif |
| buf++; |
| } |
| return 0; |
| } |
| |
| early_param("earlyprintk", setup_early_printk); |