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[PATCH] x86-64: Add simnow console 

This adds console and earlyprintk support for a host file
on AMD's SimNow simulator.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-09-12 18:49:24 +02:00 committed by Linus Torvalds
parent e5bc8b6baf
commit 459192c92c
1 changed files with 46 additions and 0 deletions
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46
arch/x86_64/kernel/early_printk.c
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@ -5,6 +5,7 @@
#include <linux/tty.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/fcntl.h>
/* Simple VGA output */
@ -158,6 +159,47 @@ static struct console early_serial_console = {
.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;
@ -205,6 +247,10 @@ int __init setup_early_printk(char *opt)
max_xpos = SCREEN_INFO.orig_video_cols;
max_ypos = SCREEN_INFO.orig_video_lines;
early_console = &early_vga_console;
} else if (!strncmp(buf, "simnow", 6)) {
simnow_init(buf + 6);
early_console = &simnow_console;
keep_early = 1;
}
early_console_initialized = 1;
register_console(early_console);