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 43extern void cons_cinput(char ch); /* The BSD routine that gets characters */ 44 45unsigned 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 52void 53serial_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 69void 70serial_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 77void 78serial_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 98boolean_t 99console_is_serial(void) 100{ 101 return (cons_ops_index == SERIAL_CONS_OPS); 102} 103 104int 105switch_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 112int 113switch_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. */ 123void 124switch_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} 135