osfmk/console/serial_general.c

   1 /*
   2  * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  */
  33 /*
  34  * @APPLE_FREE_COPYRIGHT@
  35  */
  36
  37 #include <mach_kdb.h>
  38 #include <platforms.h>
  39 #include <kern/spl.h>
  40 #include <mach/std_types.h>
  41 #include <types.h>
  42 #include <kern/thread.h>
  43 #include <console/serial_protos.h>
  44
  45 extern unsigned int disableSerialOuput;
  46 extern void cons_cinput(char ch);               /* The BSD routine that gets characters */
  47
  48 unsigned int serialmode;                                /* Serial mode keyboard and console control */
  49
  50 /*
  51  *  This routine will start a thread that polls the serial port, listening for
  52  *  characters that have been typed.
  53  */
  54
  55 void
  56 serial_keyboard_init(void)
  57 {
  58         kern_return_t   result;
  59         thread_t                thread;
  60
  61         if(!(serialmode & 2)) return;           /* Leave if we do not want a serial console */
  62
  63         kprintf("Serial keyboard started\n");
  64         result = kernel_thread_start_priority((thread_continue_t)serial_keyboard_start, NULL, MAXPRI_KERNEL, &thread);
  65         if (result != KERN_SUCCESS)
  66                 panic("serial_keyboard_init");
  67
  68         thread_deallocate(thread);
  69 }
  70
  71 void
  72 serial_keyboard_start(void)
  73 {
  74
  75         serial_keyboard_poll();                         /* Go see if there are any characters pending now */
  76         panic("serial_keyboard_start: we can't get back here\n");
  77
  78 }
  79
  80 void
  81 serial_keyboard_poll(void)
  82 {
  83         int chr;
  84         uint64_t next;
  85
  86
  87         while(1) {                                                      /* Do this for a while */
  88                 chr = _serial_getc(0, 1, 0, 1); /* Get a character if there is one */
  89                 if(chr < 0) break;                              /* The serial buffer is empty */
  90                 cons_cinput((char)chr);                 /* Buffer up the character */
  91         }
  92
  93         clock_interval_to_deadline(16, 1000000, &next); /* Get time of pop */
  94
  95         assert_wait_deadline((event_t)serial_keyboard_poll, THREAD_UNINT, next);        /* Show we are "waiting" */
  96         thread_block((thread_continue_t)serial_keyboard_poll);  /* Wait for it */
  97         panic("serial_keyboard_poll: Shouldn't never ever get here...\n");
  98 }
  99
 100 boolean_t console_is_serial()
 101 {
 102         return cons_ops_index == SERIAL_CONS_OPS;
 103 }
 104
 105 int
 106 switch_to_video_console()
 107 {
 108         int old_cons_ops = cons_ops_index;
 109         cons_ops_index = VC_CONS_OPS;
 110         return old_cons_ops;
 111 }
 112
 113 int
 114 switch_to_serial_console()
 115 {
 116         int old_cons_ops = cons_ops_index;
 117         cons_ops_index = SERIAL_CONS_OPS;
 118         return old_cons_ops;
 119 }
 120
 121 /* The switch_to_{video,serial,kgdb}_console functions return a cookie that
 122    can be used to restore the console to whatever it was before, in the
 123    same way that splwhatever() and splx() work.  */
 124 void
 125 switch_to_old_console(int old_console)
 126 {
 127         static boolean_t squawked;
 128         uint32_t ops = old_console;
 129
 130         if ((ops >= nconsops) && !squawked) {
 131                 squawked = TRUE;
 132                 printf("switch_to_old_console: unknown ops %d\n", ops);
 133         } else
 134                 cons_ops_index = ops;
 135 }