osfmk/console/serial_general.c

   1 /*
   2  * Copyright (c) 2005-2006 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  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * @APPLE_FREE_COPYRIGHT@
  33  */
  34
  35 #include <mach_kdb.h>
  36 #include <platforms.h>
  37 #include <kern/spl.h>
  38 #include <mach/std_types.h>
  39 #include <types.h>
  40 #include <kern/thread.h>
  41 #include <console/serial_protos.h>
  42
  43 extern void cons_cinput(char ch);               /* The BSD routine that gets characters */
  44
  45 unsigned int serialmode;                                /* Serial mode keyboard and console control */
  46
  47 /*
  48  *  This routine will start a thread that polls the serial port, listening for
  49  *  characters that have been typed.
  50  */
  51
  52 void
  53 serial_keyboard_init(void)
  54 {
  55         kern_return_t   result;
  56         thread_t                thread;
  57
  58         if(!(serialmode & 2)) /* Leave if we do not want a serial console */
  59                 return;
  60
  61         kprintf("Serial keyboard started\n");
  62         result = kernel_thread_start_priority((thread_continue_t)serial_keyboard_start, NULL, MAXPRI_KERNEL, &thread);
  63         if (result != KERN_SUCCESS)
  64                 panic("serial_keyboard_init");
  65
  66         thread_deallocate(thread);
  67 }
  68
  69 void
  70 serial_keyboard_start(void)
  71 {
  72         /* Go see if there are any characters pending now */
  73         serial_keyboard_poll();
  74         panic("serial_keyboard_start: we can't get back here\n");
  75 }
  76
  77 void
  78 serial_keyboard_poll(void)
  79 {
  80         int chr;
  81         uint64_t next;
  82
  83
  84         while(1) {
  85                 chr = _serial_getc(0, 1, 0, 1); /* Get a character if there is one */
  86                 if(chr < 0) /* The serial buffer is empty */
  87                         break;
  88                 cons_cinput((char)chr);                 /* Buffer up the character */
  89         }
  90
  91         clock_interval_to_deadline(16, 1000000, &next); /* Get time of pop */
  92
  93         assert_wait_deadline((event_t)serial_keyboard_poll, THREAD_UNINT, next);        /* Show we are "waiting" */
  94         thread_block((thread_continue_t)serial_keyboard_poll);  /* Wait for it */
  95         panic("serial_keyboard_poll: Shouldn't never ever get here...\n");
  96 }
  97
  98 boolean_t
  99 console_is_serial(void)
 100 {
 101         return (cons_ops_index == SERIAL_CONS_OPS);
 102 }
 103
 104 int
 105 switch_to_video_console(void)
 106 {
 107         int old_cons_ops = cons_ops_index;
 108         cons_ops_index = VC_CONS_OPS;
 109         return old_cons_ops;
 110 }
 111
 112 int
 113 switch_to_serial_console(void)
 114 {
 115         int old_cons_ops = cons_ops_index;
 116         cons_ops_index = SERIAL_CONS_OPS;
 117         return old_cons_ops;
 118 }
 119
 120 /* The switch_to_{video,serial,kgdb}_console functions return a cookie that
 121    can be used to restore the console to whatever it was before, in the
 122    same way that splwhatever() and splx() work.  */
 123 void
 124 switch_to_old_console(int old_console)
 125 {
 126         static boolean_t squawked;
 127         uint32_t ops = old_console;
 128
 129         if ((ops >= nconsops) && !squawked) {
 130                 squawked = TRUE;
 131                 printf("switch_to_old_console: unknown ops %d\n", ops);
 132         } else
 133                 cons_ops_index = ops;
 134 }