xnu-1699.26.8.tar.gz

[apple/xnu.git] / pexpert / i386 / pe_kprintf.c

diff --git a/pexpert/i386/pe_kprintf.c b/pexpert/i386/pe_kprintf.c
index 6533908ebea67eecc2a767703c99990f4b389b00..68d5fc2eb1f631011008927d5ba0a3ba30fd1b58 100644 (file)
--- a/pexpert/i386/pe_kprintf.c
+++ b/pexpert/i386/pe_kprintf.c
@@ -36,6 +36,7 @@
 #include <kern/simple_lock.h>
 #include <i386/mp.h>
 #include <machine/pal_routines.h>
+#include <i386/proc_reg.h>
 
 /* Globals */
 void (*PE_kputc)(char c);
@@ -105,10 +106,13 @@ void kprintf(const char *fmt, ...)
        boolean_t state;
 
        if (!disable_serial_output) {
-
+               boolean_t early = FALSE;
+               if (rdmsr64(MSR_IA32_GS_BASE) == 0) {
+                       early = TRUE;
+               }
                /* If PE_kputc has not yet been initialized, don't
                 * take any locks, just dump to serial */
-               if (!PE_kputc) {
+               if (!PE_kputc || early) {
                        va_start(listp, fmt);
                        _doprnt(fmt, &listp, pal_serial_putc, 16);
                        va_end(listp);