git.saurik.com Git - apple/xnu.git/blame_incremental

... / ...

Commit	Line	Data
	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_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. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23	/*
	24	* file: pe_kprintf.c
	25	* i386 platform expert debugging output initialization.
	26	*/
	27	#include <stdarg.h>
	28	#include <machine/machine_routines.h>
	29	#include <pexpert/pexpert.h>
	30	#include <kern/debug.h>
	31	#include <kern/simple_lock.h>
	32	#include <i386/mp.h>
	33
	34	/* extern references */
	35	extern void cnputc(char c);
	36	extern int serial_init(void);
	37	extern void serial_putc(char c);
	38
	39	/* Globals */
	40	void (*PE_kputc)(char c) = 0;
	41
	42	unsigned int disableSerialOuput = 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	{
	55	simple_lock_init(&kprintf_lock, 0);
	56
	57	if (PE_parse_boot_arg("debug", &boot_arg))
	58	if (boot_arg & DB_KPRT) disableSerialOuput = FALSE;
	59
	60	if (!disableSerialOuput && 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 (!disableSerialOuput) {
	88
	89	/*
	90	* Spin to get kprintf lock but re-enable interrupts while failing.
	91	* This allows interrupts to be handled while waiting but
	92	* interrupts are disabled once we have the lock.
	93	*/
	94	state = ml_set_interrupts_enabled(FALSE);
	95	while (!simple_lock_try(&kprintf_lock)) {
	96	ml_set_interrupts_enabled(state);
	97	ml_set_interrupts_enabled(FALSE);
	98	}
	99
	100	if (cpu_number() != cpu_last_locked) {
	101	MP_DEBUG_KPRINTF("[cpu%d...]\n", cpu_number());
	102	cpu_last_locked = cpu_number();
	103	}
	104
	105	va_start(listp, fmt);
	106	_doprnt(fmt, &listp, PE_kputc, 16);
	107	va_end(listp);
	108
	109	simple_unlock(&kprintf_lock);
	110	ml_set_interrupts_enabled(state);
	111	}
	112	}