X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0c530ab8987f0ae6a1a3d9284f40182b88852816..eee3565979933af707c711411001ba11fe406a3c:/pexpert/i386/pe_kprintf.c diff --git a/pexpert/i386/pe_kprintf.c b/pexpert/i386/pe_kprintf.c index 5501f3ddb..c9f720e21 100644 --- a/pexpert/i386/pe_kprintf.c +++ b/pexpert/i386/pe_kprintf.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * 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. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * 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 OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * 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_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * file: pe_kprintf.c @@ -28,17 +34,23 @@ #include #include #include +#include #include - -/* extern references */ -extern void cnputc(char c); -extern int serial_init(void); -extern void serial_putc(char c); +#include +#include +#include /* 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 */ +unsigned int disable_serial_output = FALSE; +#else +unsigned int disable_serial_output = TRUE; +#endif decl_simple_lock_data(static, kprintf_lock) @@ -49,20 +61,32 @@ void PE_init_kprintf(boolean_t vm_initialized) 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, ...) { @@ -78,37 +102,79 @@ 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