-#define printk real_printk
+#include <linux/console.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/string.h>
#include <asm/io.h>
-#undef printk
+/* Simple VGA output */
-#define VGABASE 0xffffffff800b8000ul /* This is "wrong" address to access it, we should access it using 0xffff8000000b8000ul; but 0xffff8000000b8000ul is not available early at boot. */
+#define VGABASE 0xffffffff800b8000UL
#define MAX_YPOS 25
#define MAX_XPOS 80
-static int current_ypos = 1, current_xpos = 0; /* We want to print before clearing BSS */
+static int current_ypos = 1, current_xpos = 0;
-void
-early_clear (void)
-{
- int k, i;
- for(k = 0; k < MAX_YPOS; k++)
- for(i = 0; i < MAX_XPOS; i++)
- writew(0, VGABASE + 2*(MAX_XPOS*k + i));
- current_ypos = 0;
-}
-
-void
-early_puts (const char *str)
+static void early_vga_write(struct console *con, const char *str, unsigned n)
{
char c;
int i, k, j;
- while ((c = *str++) != '\0') {
+ while ((c = *str++) != '\0' && n-- > 0) {
if (current_ypos >= MAX_YPOS) {
-#if 1
/* scroll 1 line up */
for(k = 1, j = 0; k < MAX_YPOS; k++, j++) {
for(i = 0; i < MAX_XPOS; i++) {
writew(0x720, VGABASE + 2*(MAX_XPOS*j + i));
}
current_ypos = MAX_YPOS-1;
-#else
- /* MUCH faster */
- early_clear();
- current_ypos = 0;
-#endif
}
if (c == '\n') {
current_xpos = 0;
}
}
-static char buf[1024];
+static struct console early_vga_console = {
+ name: "earlyvga",
+ write: early_vga_write,
+ flags: CON_PRINTBUFFER,
+ index: -1,
+};
+
+/* Serial functions losely based on a similar package from Klaus P. Gerlicher */
+
+int early_serial_base = 0x3f8; /* ttyS0 */
-int printk(const char *fmt, ...) __attribute__((alias("early_printk")));
+#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)
+ rep_nop();
+ 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++;
+ }
+}
-int early_printk(const char *fmt, ...)
+static __init void early_serial_init(char *opt)
{
- va_list args;
- int i;
+ static int bases[] = { 0x3f8, 0x2f8 };
+ unsigned char c;
+ unsigned divisor, baud = 38400;
+ char *s, *e;
- va_start(args, fmt);
- i = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf)-4 */
- va_end(args);
+ s = strsep(&opt, ",");
+ if (s != NULL) {
+ unsigned port;
+ ++s;
+ 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];
+ }
+
+ c = inb(early_serial_base + LCR);
+ outb(c & ~DLAB, early_serial_base + LCR);
+ outb(0, early_serial_base + IER); /* no interrupt */
+ outb(0, early_serial_base + FCR); /* no fifo */
+ outb(0x3, early_serial_base + LCR); /* 8n1 */
+ outb(0x3, early_serial_base + MCR); /* DTR + RTS */
+
+ s = strsep(&opt, ",");
+ if (s != NULL) {
+ baud = simple_strtoul(s, &e, 0);
+ if (baud == 0 || s == e)
+ baud = 38400;
+ }
+
+ 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,
+};
- early_puts(buf);
+/* Direct interface for emergencies */
+struct console *early_console = &early_vga_console;
+static int early_console_initialized = 0;
- return i;
+void early_printk(const char *fmt, ...)
+{
+ char buf[512];
+ int n;
+ va_list ap;
+ va_start(ap,fmt);
+ n = vsnprintf(buf,512,fmt,ap);
+ early_console->write(early_console,buf,n);
+ va_end(ap);
+}
+
+int __init setup_early_printk(char *opt)
+{
+ if (early_console_initialized)
+ return;
+ early_console_initialized = 1;
+
+ if (!strncmp(opt, "serial", 6)) {
+ early_serial_init(opt+7);
+ early_console = &early_serial_console;
+ } else if (!strncmp(opt, "vga", 3))
+ early_console = &early_vga_console;
+ else
+ return -1;
+ register_console(early_console);
+ return 0;
}
+
+void __init disable_early_printk(void)
+{
+ if (early_console_initialized) {
+ unregister_console(early_console);
+ early_console_initialized = 0;
+ }
+}
+
+/* syntax: earlyprintk=vga
+ earlyprintk=serial[,ttySn[,baudrate]]
+ Only vga or serial at a time, not both.
+ Currently only ttyS0 and ttyS1 are supported.
+ Interaction with the standard serial driver is not very good.
+ The VGA output is eventually overwritten by the real console. */
+__setup("earlyprintk=", setup_early_printk);
write_cr0(oldcr0 & ~((1UL<<3)|(1UL<<2))); /* clear TS and EM */
- asm("fninit");
- load_mxcsr(0x1f80);
- /* initialize MMX state. normally this will be covered by fninit, but the
- architecture doesn't guarantee it so do it explicitely. */
- asm volatile("movq %0,%%mm0\n\t"
- "movq %%mm0,%%mm1\n\t"
- "movq %%mm0,%%mm2\n\t"
- "movq %%mm0,%%mm3\n\t"
- "movq %%mm0,%%mm4\n\t"
- "movq %%mm0,%%mm5\n\t"
- "movq %%mm0,%%mm6\n\t"
- "movq %%mm0,%%mm7\n\t" :: "m" (0ULL));
- asm("emms");
-
- /* initialize XMM state */
- asm("xorpd %xmm0,%xmm0");
- asm("xorpd %xmm1,%xmm1");
- asm("xorpd %xmm2,%xmm2");
- asm("xorpd %xmm3,%xmm3");
- asm("xorpd %xmm4,%xmm4");
- asm("xorpd %xmm5,%xmm5");
- asm("xorpd %xmm6,%xmm6");
- asm("xorpd %xmm7,%xmm7");
- asm("xorpd %xmm8,%xmm8");
- asm("xorpd %xmm9,%xmm9");
- asm("xorpd %xmm10,%xmm10");
- asm("xorpd %xmm11,%xmm11");
- asm("xorpd %xmm12,%xmm12");
- asm("xorpd %xmm13,%xmm13");
- asm("xorpd %xmm14,%xmm14");
- asm("xorpd %xmm15,%xmm15");
- load_mxcsr(0x1f80);
- asm volatile("fxsave %0" : "=m" (init_fpu_env));
-
/* clean state in init */
stts();
clear_thread_flag(TIF_USEDFPU);
*/
void init_fpu(void)
{
-#if 0
- asm("fninit");
- load_mxcsr(0x1f80);
-#else
- asm volatile("fxrstor %0" :: "m" (init_fpu_env));
-#endif
- current->used_math = 1;
+ struct task_struct *me = current;
+ memset(&me->thread.i387.fxsave, 0, sizeof(struct i387_fxsave_struct));
+ me->thread.i387.fxsave.cwd = 0x37f;
+ me->thread.i387.fxsave.mxcsr = 0x1f80;
+ me->used_math = 1;
}
/*
projects / linux / commitdiff