xnu-792.22.5.tar.gz

[apple/xnu.git] / osfmk / console / serial_general.c

diff --git a/osfmk/console/serial_general.c b/osfmk/console/serial_general.c
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+++ b/osfmk/console/serial_general.c
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+/*
+ * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ * 
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+/*
+ * @OSF_COPYRIGHT@
+ */
+/*
+ * @APPLE_FREE_COPYRIGHT@
+ */
+
+#include <mach_kdb.h>
+#include <platforms.h>
+#include <kern/spl.h>
+#include <mach/std_types.h>
+#include <types.h>
+#include <kern/thread.h>
+#include <console/serial_protos.h>
+
+extern unsigned int disableSerialOuput;
+extern void cons_cinput(char ch);              /* The BSD routine that gets characters */
+
+unsigned int serialmode;                               /* Serial mode keyboard and console control */
+
+/*
+ *  This routine will start a thread that polls the serial port, listening for
+ *  characters that have been typed.
+ */
+
+void
+serial_keyboard_init(void)
+{
+       kern_return_t   result;
+       thread_t                thread;
+
+       if(!(serialmode & 2)) return;           /* Leave if we do not want a serial console */
+
+       kprintf("Serial keyboard started\n");
+       result = kernel_thread_start_priority((thread_continue_t)serial_keyboard_start, NULL, MAXPRI_KERNEL, &thread);
+       if (result != KERN_SUCCESS)
+               panic("serial_keyboard_init");
+
+       thread_deallocate(thread);
+}
+
+void
+serial_keyboard_start(void)
+{
+
+       serial_keyboard_poll();                         /* Go see if there are any characters pending now */
+       panic("serial_keyboard_start: we can't get back here\n");
+
+}
+
+void
+serial_keyboard_poll(void)
+{
+       int chr;
+       uint64_t next;
+
+
+       while(1) {                                                      /* Do this for a while */
+               chr = _serial_getc(0, 1, 0, 1); /* Get a character if there is one */
+               if(chr < 0) break;                              /* The serial buffer is empty */
+               cons_cinput((char)chr);                 /* Buffer up the character */
+       }
+
+       clock_interval_to_deadline(16, 1000000, &next); /* Get time of pop */
+
+       assert_wait_deadline((event_t)serial_keyboard_poll, THREAD_UNINT, next);        /* Show we are "waiting" */
+       thread_block((thread_continue_t)serial_keyboard_poll);  /* Wait for it */
+       panic("serial_keyboard_poll: Shouldn't never ever get here...\n");
+}
+
+boolean_t console_is_serial()
+{
+       return cons_ops_index == SERIAL_CONS_OPS;
+}
+
+int
+switch_to_video_console()
+{
+       int old_cons_ops = cons_ops_index;
+       cons_ops_index = VC_CONS_OPS;
+       return old_cons_ops;
+}
+
+int
+switch_to_serial_console()
+{
+       int old_cons_ops = cons_ops_index;
+       cons_ops_index = SERIAL_CONS_OPS;
+       return old_cons_ops;
+}
+
+/* The switch_to_{video,serial,kgdb}_console functions return a cookie that
+   can be used to restore the console to whatever it was before, in the
+   same way that splwhatever() and splx() work.  */
+void
+switch_to_old_console(int old_console)
+{
+       static boolean_t squawked;
+       uint32_t ops = old_console;
+
+       if ((ops >= nconsops) && !squawked) {
+               squawked = TRUE;
+               printf("switch_to_old_console: unknown ops %d\n", ops);
+       } else
+               cons_ops_index = ops;
+}