1 files changed, 258 insertions, 1 deletions

diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
index 92f812ba275c..fd9aff3f3890 100644
--- a/arch/x86/kernel/early_printk.c
+++ b/arch/x86/kernel/early_printk.c
@@ -1,2 +1,259 @@
+#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>
+#include <xen/hvc-console.h>
 
-#include "../../x86_64/kernel/early_printk.c"
+/* Simple VGA output */
+
+#ifdef __i386__
+#include <asm/setup.h>
+#else
+#include <asm/bootsetup.h>
+#endif
+#define VGABASE         (__ISA_IO_base + 0xb8000)
+
+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) {
+                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 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;
+}
+
+static 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 (strstr(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;
+#ifdef CONFIG_HVC_XEN
+        } else if (!strncmp(buf, "xen", 3)) {
+                early_console = &xenboot_console;
+#endif
+        }
+
+        if (keep_early)
+                early_console->flags &= ~CON_BOOT;
+        else
+                early_console->flags |= CON_BOOT;
+        register_console(early_console);
+        return 0;
+}
+early_param("earlyprintk", setup_early_printk);