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authorJason Wessel <jason.wessel@windriver.com>2009-08-20 15:39:52 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-23 06:46:38 -0700
commitc9530948bc626c8b638015c0b32abb9615659ec6 (patch)
treefa840d9ec32f834c66bfde5c67c764ee24f99fa0 /arch/x86/kernel/early_printk.c
parent56faf0f98fd53e4a27cec331a3ff6d4aa55b1213 (diff)
early_printk: Allow more than one early console
It is desirable to be able to use one early boot device to debug another or to have multiple places you can see the early boot diagnostics, such as the vga screen or serial device. This patch changes the early_printk console device registration to allow more than one early printk device to get registered via register_console(). Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/x86/kernel/early_printk.c')
-rw-r--r--arch/x86/kernel/early_printk.c65
1 files changed, 33 insertions, 32 deletions
diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
index 519a5e10be5..2acfd3fdc0c 100644
--- a/arch/x86/kernel/early_printk.c
+++ b/arch/x86/kernel/early_printk.c
@@ -176,10 +176,19 @@ asmlinkage void early_printk(const char *fmt, ...)
va_end(ap);
}
+static inline void early_console_register(struct console *con, int keep_early)
+{
+ 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_early;
+ int keep;
if (!buf)
return 0;
@@ -188,42 +197,34 @@ static int __init setup_early_printk(char *buf)
return 0;
early_console_initialized = 1;
- keep_early = (strstr(buf, "keep") != NULL);
-
- 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)
- && 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 = &early_vga_console;
+ keep = (strstr(buf, "keep") != NULL);
+
+ while (*buf != '\0') {
+ if (!strncmp(buf, "serial", 6)) {
+ early_serial_init(buf + 6);
+ early_console_register(&early_serial_console, keep);
+ }
+ 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
- } else if (!strncmp(buf, "dbgp", 4)) {
- if (early_dbgp_init(buf+4) < 0)
- return 0;
- early_console = &early_dbgp_console;
- /*
- * usb subsys will reset ehci controller, so don't keep
- * that early console
- */
- keep_early = 0;
+ if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
+ early_console_register(&early_dbgp_console, keep);
#endif
#ifdef CONFIG_HVC_XEN
- } else if (!strncmp(buf, "xen", 3)) {
- early_console = &xenboot_console;
+ if (!strncmp(buf, "xen", 3))
+ early_console_register(&xenboot_console, keep);
#endif
+ buf++;
}
-
- if (keep_early)
- early_console->flags &= ~CON_BOOT;
- else
- early_console->flags |= CON_BOOT;
- register_console(early_console);
return 0;
}