/* * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * file: pe_kprintf.c * i386 platform expert debugging output initialization. */ #include <stdarg.h> #include <machine/machine_routines.h> #include <pexpert/pexpert.h> #include <kern/debug.h> #include <kern/simple_lock.h> #include <i386/mp.h> /* Globals */ void (*PE_kputc)(char c); unsigned int disable_serial_output = TRUE; decl_simple_lock_data(static, kprintf_lock) void PE_init_kprintf(boolean_t vm_initialized) { unsigned int boot_arg; if (PE_state.initialized == FALSE) panic("Platform Expert not initialized"); if (!vm_initialized) { simple_lock_init(&kprintf_lock, 0); if (PE_parse_boot_arg("debug", &boot_arg)) if (boot_arg & DB_KPRT) disable_serial_output = FALSE; if (!disable_serial_output && serial_init()) PE_kputc = serial_putc; else PE_kputc = cnputc; } } #ifdef MP_DEBUG static void _kprintf(const char *format, ...) { va_list listp; va_start(listp, format); _doprnt(format, &listp, PE_kputc, 16); va_end(listp); } #define MP_DEBUG_KPRINTF(x...) _kprintf(x) #else /* MP_DEBUG */ #define MP_DEBUG_KPRINTF(x...) #endif /* MP_DEBUG */ static int cpu_last_locked = 0; void kprintf(const char *fmt, ...) { va_list listp; boolean_t state; if (!disable_serial_output) { /* * 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); } if (cpu_number() != cpu_last_locked) { MP_DEBUG_KPRINTF("[cpu%d...]\n", cpu_number()); cpu_last_locked = cpu_number(); } 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 kprintf_break_lock(void) { simple_lock_init(&kprintf_lock, 0); }