early_printk() starts output on the second screen line and doesn't
clear the rest of the line when it hits a newline char. When there
is already a BIOS message there, it becomes hard to read. Change
this so it starts on the first line and clears to EOL upon hitting
newline.
Signed-off-by: Chuck Ebbert <[email protected]>
--- 2.6.16-rc4-64.orig/arch/x86_64/kernel/early_printk.c
+++ 2.6.16-rc4-64/arch/x86_64/kernel/early_printk.c
@@ -21,7 +21,15 @@
#define MAX_XPOS max_xpos
static int max_ypos = 25, max_xpos = 80;
-static int current_ypos = 1, current_xpos = 0;
+static int current_ypos, current_xpos; /* 0,0 */
+
+static noinline void clear_to_eol(int xpos, int ypos)
+{
+ int i;
+
+ for (i = xpos; i < MAX_XPOS; i++)
+ writew(0x720, VGABASE + 2*(MAX_XPOS*ypos + i));
+}
static void early_vga_write(struct console *con, const char *str, unsigned n)
{
@@ -37,11 +45,11 @@ static void early_vga_write(struct conso
VGABASE + 2*(MAX_XPOS*j + i));
}
}
- for (i = 0; i < MAX_XPOS; i++)
- writew(0x720, VGABASE + 2*(MAX_XPOS*j + i));
+ clear_to_eol(0, j);
current_ypos = MAX_YPOS-1;
}
if (c == '\n') {
+ clear_to_eol(current_xpos, current_ypos);
current_xpos = 0;
current_ypos++;
} else if (c != '\r') {
--
Chuck
"Equations are the Devil's sentences." --Stephen Colbert
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