pe_kprintf.c

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    1 /*
    2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    5  * 
    6  * The contents of this file constitute Original Code as defined in and
    7  * are subject to the Apple Public Source License Version 1.1 (the
    8  * "License").  You may not use this file except in compliance with the
    9  * License.  Please obtain a copy of the License at
   10  * http://www.apple.com/publicsource and read it before using this file.
   11  * 
   12  * This Original Code and all software distributed under the License are
   13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
   17  * License for the specific language governing rights and limitations
   18  * under the License.
   19  * 
   20  * @APPLE_LICENSE_HEADER_END@
   21  */
   22 /*
   23  * file: pe_kprintf.c
   24  *    i386 platform expert debugging output initialization.
   25  */
   26 #include <stdarg.h>
   27 #include <machine/machine_routines.h>
   28 #include <pexpert/pexpert.h>
   29 #include <kern/debug.h>
   30 #include <kern/simple_lock.h>
   31 #include <i386/mp.h>
   32 
   33 /* extern references */
   34 extern void cnputc(char c);
   35 extern int  serial_init(void);
   36 extern void serial_putc(char c);
   37 
   38 /* Globals */
   39 void (*PE_kputc)(char c) = 0;
   40 
   41 unsigned int disableSerialOuput = TRUE;
   42 
   43 decl_simple_lock_data(static, kprintf_lock)
   44 
   45 void PE_init_kprintf(boolean_t vm_initialized)
   46 {
   47         unsigned int    boot_arg;
   48 
   49         if (PE_state.initialized == FALSE)
   50                 panic("Platform Expert not initialized");
   51 
   52         if (!vm_initialized)
   53         {
   54         simple_lock_init(&kprintf_lock, 0);
   55 
   56             if (PE_parse_boot_arg("debug", &boot_arg)) 
   57                 if (boot_arg & DB_KPRT) disableSerialOuput = FALSE;
   58 
   59         if (!disableSerialOuput && serial_init())
   60             PE_kputc = serial_putc;
   61         else
   62             PE_kputc = cnputc;
   63     }
   64 }
   65 
   66 #ifdef MP_DEBUG
   67 static void _kprintf(const char *format, ...)
   68 {
   69         va_list   listp;
   70 
   71         va_start(listp, format);
   72         _doprnt(format, &listp, PE_kputc, 16);
   73         va_end(listp);
   74 }
   75 #define MP_DEBUG_KPRINTF(x...)  _kprintf(x)
   76 #else  /* MP_DEBUG */
   77 #define MP_DEBUG_KPRINTF(x...)
   78 #endif /* MP_DEBUG */
   79 
   80 static int cpu_last_locked = 0;
   81 void kprintf(const char *fmt, ...)
   82 {
   83         va_list   listp;
   84     boolean_t state;
   85     
   86     if (!disableSerialOuput) {
   87 
   88         /*
   89          * Spin to get kprintf lock but re-enable interrupts while failing.
   90          * This allows interrupts to be handled while waiting but
   91          * interrupts are disabled once we have the lock.
   92          */
   93         state = ml_set_interrupts_enabled(FALSE);
   94         while (!simple_lock_try(&kprintf_lock)) {
   95              ml_set_interrupts_enabled(state);
   96              ml_set_interrupts_enabled(FALSE);
   97         }
   98 
   99         if (cpu_number() != cpu_last_locked) {
  100             MP_DEBUG_KPRINTF("[cpu%d...]\n", cpu_number());
  101             cpu_last_locked = cpu_number();
  102         }
  103 
  104         va_start(listp, fmt);
  105         _doprnt(fmt, &listp, PE_kputc, 16);
  106         va_end(listp);
  107 
  108         simple_unlock(&kprintf_lock);
  109         ml_set_interrupts_enabled(state);
  110     }
  111 }

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FreeBSD/Linux Kernel Cross Reference sys/pexpert/i386/pe_kprintf.c

FreeBSD/Linux Kernel Cross Reference
sys/pexpert/i386/pe_kprintf.c