X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/2d21ac55c334faf3a56e5634905ed6987fc787d4..b226f5e54a60dc81db17b1260381d7dbfea3cdf1:/pexpert/i386/pe_kprintf.c

diff --git a/pexpert/i386/pe_kprintf.c b/pexpert/i386/pe_kprintf.c
index 7db76a179..d1d51da43 100644
--- a/pexpert/i386/pe_kprintf.c
+++ b/pexpert/i386/pe_kprintf.c
@@ -34,12 +34,24 @@
 #include <pexpert/pexpert.h>
 #include <kern/debug.h>
 #include <kern/simple_lock.h>
+#include <i386/machine_cpu.h>
 #include <i386/mp.h>
+#include <machine/pal_routines.h>
+#include <i386/proc_reg.h>
+#include <os/log_private.h>
+#include <libkern/section_keywords.h>
 
 /* Globals */
 void (*PE_kputc)(char c);
 
-unsigned int disable_serial_output = TRUE;
+#if DEVELOPMENT || DEBUG 
+/* DEBUG kernel starts with true serial, but
+ * may later disable or switch to video
+ * console */
+SECURITY_READ_ONLY_LATE(unsigned int) disable_serial_output = FALSE;
+#else
+SECURITY_READ_ONLY_LATE(unsigned int) disable_serial_output = TRUE;
+#endif
 
 decl_simple_lock_data(static, kprintf_lock)
 
@@ -51,19 +63,31 @@ void PE_init_kprintf(boolean_t vm_initialized)
 		panic("Platform Expert not initialized");
 
 	if (!vm_initialized) {
+		unsigned int new_disable_serial_output = TRUE;
+
 		simple_lock_init(&kprintf_lock, 0);
 
-		if (PE_parse_boot_arg("debug", &boot_arg))
+		if (PE_parse_boot_argn("debug", &boot_arg, sizeof (boot_arg)))
 			if (boot_arg & DB_KPRT)
-				disable_serial_output = FALSE;
+				new_disable_serial_output = FALSE;
 
-		if (!disable_serial_output && serial_init())
-			PE_kputc = serial_putc;
+		/* If we are newly enabling serial, make sure we only
+		 * call pal_serial_init() if our previous state was
+		 * not enabled */
+		if (!new_disable_serial_output && (!disable_serial_output || pal_serial_init()))
+			PE_kputc = pal_serial_putc;
 		else
 			PE_kputc = cnputc;
+
+		disable_serial_output = new_disable_serial_output;
 	}
 }
 
+#if CONFIG_NO_KPRINTF_STRINGS
+/* Prevent CPP from breaking the definition below */
+#undef kprintf
+#endif
+
 #ifdef MP_DEBUG
 static void _kprintf(const char *format, ...)
 {
@@ -79,23 +103,47 @@ static void _kprintf(const char *format, ...)
 #endif /* MP_DEBUG */
 
 static int cpu_last_locked = 0;
+
+__attribute__((noinline,not_tail_called))
 void kprintf(const char *fmt, ...)
 {
-	va_list   listp;
-	boolean_t state;
+	va_list    listp;
+	va_list    listp2;
+	boolean_t  state;
+	void      *caller = __builtin_return_address(0);
 
 	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 || early) {
+			va_start(listp, fmt);
+			va_copy(listp2, listp);
+
+			_doprnt_log(fmt, &listp, pal_serial_putc, 16);
+			va_end(listp);
+
+			// If interrupts are enabled
+			if (ml_get_interrupts_enabled()) {
+				os_log_with_args(OS_LOG_DEFAULT, OS_LOG_TYPE_DEFAULT, fmt, listp2, caller);
+			}
+			va_end(listp2);
+			return;
+		}
 
 		/*
-		 * Spin to get kprintf lock but re-enable interrupts while
-		 * failing.
-		 * This allows interrupts to be handled while waiting but
-		 * interrupts are disabled once we have the lock.
+		 * Spin to get kprintf lock but poll for incoming signals
+		 * while interrupts are masked.
 		 */
 		state = ml_set_interrupts_enabled(FALSE);
+
+		pal_preemption_assert();
+
 		while (!simple_lock_try(&kprintf_lock)) {
-			ml_set_interrupts_enabled(state);
-			ml_set_interrupts_enabled(FALSE);
+			(void) cpu_signal_handler(NULL);
 		}
 
 		if (cpu_number() != cpu_last_locked) {
@@ -104,14 +152,31 @@ void kprintf(const char *fmt, ...)
 		}
 
 		va_start(listp, fmt);
+		va_copy(listp2, listp);
 		_doprnt(fmt, &listp, PE_kputc, 16);
 		va_end(listp);
 
 		simple_unlock(&kprintf_lock);
 		ml_set_interrupts_enabled(state);
+
+		// If interrupts are enabled
+		if (ml_get_interrupts_enabled()) {
+			os_log_with_args(OS_LOG_DEFAULT, OS_LOG_TYPE_DEFAULT, fmt, listp2, caller);
+		}
+		va_end(listp2);
+
+	}
+	else {
+		if (ml_get_interrupts_enabled()) {
+			va_start(listp, fmt);
+			os_log_with_args(OS_LOG_DEFAULT, OS_LOG_TYPE_DEFAULT, fmt, listp, caller);
+			va_end(listp);
+		}
 	}
 }
 
+
+
 extern void kprintf_break_lock(void);
 void
 kprintf_break_lock(void)