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	1	/*
	2	* Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	/*
	29	* file: pe_kprintf.c
	30	* i386 platform expert debugging output initialization.
	31	*/
	32	#include <stdarg.h>
	33	#include <machine/machine_routines.h>
	34	#include <pexpert/pexpert.h>
	35	#include <kern/debug.h>
	36	#include <kern/simple_lock.h>
	37	#include <i386/mp.h>
	38
	39	/* Globals */
	40	void (*PE_kputc)(char c);
	41
	42	unsigned int disable_serial_output = TRUE;
	43
	44	decl_simple_lock_data(static, kprintf_lock)
	45
	46	void PE_init_kprintf(boolean_t vm_initialized)
	47	{
	48	unsigned int boot_arg;
	49
	50	if (PE_state.initialized == FALSE)
	51	panic("Platform Expert not initialized");
	52
	53	if (!vm_initialized) {
	54	simple_lock_init(&kprintf_lock, 0);
	55
	56	if (PE_parse_boot_arg("debug", &boot_arg))
	57	if (boot_arg & DB_KPRT)
	58	disable_serial_output = FALSE;
	59
	60	if (!disable_serial_output && serial_init())
	61	PE_kputc = serial_putc;
	62	else
	63	PE_kputc = cnputc;
	64	}
	65	}
	66
	67	#ifdef MP_DEBUG
	68	static void _kprintf(const char *format, ...)
	69	{
	70	va_list listp;
	71
	72	va_start(listp, format);
	73	_doprnt(format, &listp, PE_kputc, 16);
	74	va_end(listp);
	75	}
	76	#define MP_DEBUG_KPRINTF(x...) _kprintf(x)
	77	#else /* MP_DEBUG */
	78	#define MP_DEBUG_KPRINTF(x...)
	79	#endif /* MP_DEBUG */
	80
	81	static int cpu_last_locked = 0;
	82	void kprintf(const char *fmt, ...)
	83	{
	84	va_list listp;
	85	boolean_t state;
	86
	87	if (!disable_serial_output) {
	88
	89	/*
	90	* Spin to get kprintf lock but re-enable interrupts while
	91	* failing.
	92	* This allows interrupts to be handled while waiting but
	93	* interrupts are disabled once we have the lock.
	94	*/
	95	state = ml_set_interrupts_enabled(FALSE);
	96	while (!simple_lock_try(&kprintf_lock)) {
	97	ml_set_interrupts_enabled(state);
	98	ml_set_interrupts_enabled(FALSE);
	99	}
	100
	101	if (cpu_number() != cpu_last_locked) {
	102	MP_DEBUG_KPRINTF("[cpu%d...]\n", cpu_number());
	103	cpu_last_locked = cpu_number();
	104	}
	105
	106	va_start(listp, fmt);
	107	_doprnt(fmt, &listp, PE_kputc, 16);
	108	va_end(listp);
	109
	110	simple_unlock(&kprintf_lock);
	111	ml_set_interrupts_enabled(state);
	112	}
	113	}
	114
	115	extern void kprintf_break_lock(void);
	116	void
	117	kprintf_break_lock(void)
	118	{
	119	simple_lock_init(&kprintf_lock, 0);
	120	}