osfmk/console/serial_general.c

   1 /*
   2  * Copyright (c) 2005 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 unsigned int disableSerialOuput;
  44 extern void cons_cinput(char ch);               /* The BSD routine that gets characters */
  45
  46 unsigned int serialmode;                                /* Serial mode keyboard and console control */
  47
  48 /*
  49  *  This routine will start a thread that polls the serial port, listening for
  50  *  characters that have been typed.
  51  */
  52
  53 void
  54 serial_keyboard_init(void)
  55 {
  56         kern_return_t   result;
  57         thread_t                thread;
  58
  59         if(!(serialmode & 2)) return;           /* Leave if we do not want a serial console */
  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
  73         serial_keyboard_poll();                         /* Go see if there are any characters pending now */
  74         panic("serial_keyboard_start: we can't get back here\n");
  75
  76 }
  77
  78 void
  79 serial_keyboard_poll(void)
  80 {
  81         int chr;
  82         uint64_t next;
  83
  84
  85         while(1) {                                                      /* Do this for a while */
  86                 chr = _serial_getc(0, 1, 0, 1); /* Get a character if there is one */
  87                 if(chr < 0) break;                              /* The serial buffer is empty */
  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 console_is_serial()
  99 {
 100         return cons_ops_index == SERIAL_CONS_OPS;
 101 }
 102
 103 int
 104 switch_to_video_console()
 105 {
 106         int old_cons_ops = cons_ops_index;
 107         cons_ops_index = VC_CONS_OPS;
 108         return old_cons_ops;
 109 }
 110
 111 int
 112 switch_to_serial_console()
 113 {
 114         int old_cons_ops = cons_ops_index;
 115         cons_ops_index = SERIAL_CONS_OPS;
 116         return old_cons_ops;
 117 }
 118
 119 /* The switch_to_{video,serial,kgdb}_console functions return a cookie that
 120    can be used to restore the console to whatever it was before, in the
 121    same way that splwhatever() and splx() work.  */
 122 void
 123 switch_to_old_console(int old_console)
 124 {
 125         static boolean_t squawked;
 126         uint32_t ops = old_console;
 127
 128         if ((ops >= nconsops) && !squawked) {
 129                 squawked = TRUE;
 130                 printf("switch_to_old_console: unknown ops %d\n", ops);
 131         } else
 132                 cons_ops_index = ops;
 133 }