pexpert/ppc/pe_kprintf.c

   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  *    PPC platform expert debugging output initialization.
  31  */
  32 #include <stdarg.h>
  33 #include <machine/machine_routines.h>
  34 #include <pexpert/protos.h>
  35 #include <pexpert/pexpert.h>
  36 #include <pexpert/ppc/powermac.h>
  37 #include <pexpert/device_tree.h>
  38 #include <kern/debug.h>
  39 #include <kern/simple_lock.h>
  40 #include <vm/pmap.h>
  41
  42 /* extern references */
  43 extern void scc_putc(int unit, int line, int c);
  44 extern long strtol(const char *, char **, int);
  45
  46 /* Globals */
  47 void (*PE_kputc)(char c);
  48
  49 unsigned int disable_serial_output = TRUE;
  50
  51 vm_offset_t     scc = 0;
  52
  53 struct slock kprintf_lock;
  54
  55 void PE_init_kprintf(__unused boolean_t vm_initialized)
  56 {
  57         unsigned int    boot_arg;
  58         int32_t                 serial_baud = -1;
  59         unsigned int    size;
  60         DTEntry         options;
  61         char            *str, baud[7];
  62
  63         if (PE_state.initialized == FALSE)
  64                 panic("Platform Expert not initialized");
  65
  66         if (PE_parse_boot_argn("debug", &boot_arg, sizeof (boot_arg)))
  67                 if(boot_arg & DB_KPRT) disable_serial_output = FALSE;
  68
  69         if (DTLookupEntry(NULL, "/options", &options) == kSuccess) {
  70           if (DTGetProperty(options, "input-device", (void **)&str, &size) == kSuccess) {
  71                 if ((size > 5) && !strncmp("scca:", str, 5)) {
  72                   size -= 5;
  73                   str += 5;
  74                   if (size <= 6) {
  75                         strncpy(baud, str, size);
  76                         baud[size] = '\0';
  77                         gPESerialBaud = strtol(baud, NULL, 0);
  78                   }
  79                 }
  80           }
  81           if (DTGetProperty(options, "output-device", (void **)&str, &size) == kSuccess) {
  82                 if ((size > 5) && !strncmp("scca:", str, 5)) {
  83                   size -= 5;
  84                   str += 5;
  85                   if (size <= 6) {
  86                         strncpy(baud, str, size);
  87                         baud[size] = '\0';
  88                         gPESerialBaud = strtol(baud, NULL, 0);
  89                   }
  90                 }
  91           }
  92         }
  93
  94         /* Check the boot-args for new serial baud. */
  95         if (PE_parse_boot_argn("serialbaud", &serial_baud, sizeof (serial_baud)))
  96                 if (serial_baud != -1) gPESerialBaud = serial_baud;
  97
  98         if( (scc = PE_find_scc())) {                            /* See if we can find the serial port */
  99                 scc = io_map_spec(scc, 0x1000, VM_WIMG_IO);     /* Map it in */
 100                 initialize_serial((void *)scc, gPESerialBaud); /* Start up the serial driver */
 101                 PE_kputc = serial_putc;
 102
 103                 simple_lock_init(&kprintf_lock, 0);
 104         } else
 105                         PE_kputc = cnputc;
 106
 107 #if 0
 108         /*
 109          * FUTURE: eventually let the boot command determine where
 110          *         the debug output will be, serial, video, etc.
 111          */
 112         switch (PE_state.debug_video.v_display) {
 113             case kDebugTypeSerial:
 114                     PE_kputc = serial_putc;
 115                     break;
 116
 117             case kDebugTypeDisplay:
 118                     init_display_putc(  (unsigned char*)PE_state.debug_video.v_baseAddr,
 119                                                         PE_state.debug_video.v_rowBytes,
 120                                                         PE_state.debug_video.v_height);
 121                     PE_kputc = display_putc;
 122                     break;
 123
 124             default:
 125                     PE_state.debug_video.v_baseAddr = 0;
 126         }
 127 #endif
 128 }
 129
 130 void serial_putc(char c)
 131 {
 132         scc_putc(0, 1, c);
 133         if (c == '\n')
 134                 scc_putc(0, 1, '\r');
 135 }
 136
 137 void kprintf(const char *fmt, ...)
 138 {
 139         va_list   listp;
 140         boolean_t state;
 141
 142         state = ml_set_interrupts_enabled(FALSE);
 143         simple_lock(&kprintf_lock);
 144
 145         if (!disable_serial_output) {
 146                 va_start(listp, fmt);
 147                 _doprnt(fmt, &listp, PE_kputc, 16);
 148                 va_end(listp);
 149         }
 150
 151         simple_unlock(&kprintf_lock);
 152         ml_set_interrupts_enabled(state);
 153 }
 154