/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <pexpert/pexpert.h>
#include <kern/debug.h>
#include <kern/simple_lock.h>
+#include <i386/machine_cpu.h>
#include <i386/mp.h>
-
-/* extern references */
-extern void cnputc(char c);
-extern int serial_init(void);
-extern void serial_putc(char c);
+#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) = 0;
+void (*PE_kputc)(char c);
-unsigned int disableSerialOuput = 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)
if (PE_state.initialized == FALSE)
panic("Platform Expert not initialized");
- if (!vm_initialized)
- {
- simple_lock_init(&kprintf_lock, 0);
+ if (!vm_initialized) {
+ unsigned int new_disable_serial_output = TRUE;
+
+ simple_lock_init(&kprintf_lock, 0);
+
+ if (PE_parse_boot_argn("debug", &boot_arg, sizeof (boot_arg)))
+ if (boot_arg & DB_KPRT)
+ new_disable_serial_output = FALSE;
- if (PE_parse_boot_arg("debug", &boot_arg))
- if (boot_arg & DB_KPRT) disableSerialOuput = FALSE;
+ /* 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;
- if (!disableSerialOuput && serial_init())
- PE_kputc = 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, ...)
{
#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;
-
- if (!disableSerialOuput) {
-
- /*
- * 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.
- */
- state = ml_set_interrupts_enabled(FALSE);
- while (!simple_lock_try(&kprintf_lock)) {
- ml_set_interrupts_enabled(state);
- ml_set_interrupts_enabled(FALSE);
- }
+ 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 poll for incoming signals
+ * while interrupts are masked.
+ */
+ state = ml_set_interrupts_enabled(FALSE);
+
+ pal_preemption_assert();
+
+ while (!simple_lock_try(&kprintf_lock)) {
+ (void) cpu_signal_handler(NULL);
+ }
+
+ if (cpu_number() != cpu_last_locked) {
+ MP_DEBUG_KPRINTF("[cpu%d...]\n", cpu_number());
+ cpu_last_locked = cpu_number();
+ }
+
+ 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);
- if (cpu_number() != cpu_last_locked) {
- MP_DEBUG_KPRINTF("[cpu%d...]\n", cpu_number());
- cpu_last_locked = cpu_number();
}
+ 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);
+ }
+ }
+}
- va_start(listp, fmt);
- _doprnt(fmt, &listp, PE_kputc, 16);
- va_end(listp);
- simple_unlock(&kprintf_lock);
- ml_set_interrupts_enabled(state);
- }
-}
extern void kprintf_break_lock(void);
void
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