1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24*0Sstevel@tonic-gate * Use is subject to license terms.
25*0Sstevel@tonic-gate */
26*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
27*0Sstevel@tonic-gate
28*0Sstevel@tonic-gate #include <sys/stropts.h>
29*0Sstevel@tonic-gate #include <sys/devops.h>
30*0Sstevel@tonic-gate #include <sys/modctl.h>
31*0Sstevel@tonic-gate #include <sys/ddi.h>
32*0Sstevel@tonic-gate #include <sys/sunddi.h>
33*0Sstevel@tonic-gate #include <sys/promif.h>
34*0Sstevel@tonic-gate #include <sys/note.h>
35*0Sstevel@tonic-gate #include <sys/consdev.h>
36*0Sstevel@tonic-gate #include <sys/polled_io.h>
37*0Sstevel@tonic-gate
38*0Sstevel@tonic-gate /*
39*0Sstevel@tonic-gate * consconfig is aware of which devices are the stdin and stout. The
40*0Sstevel@tonic-gate * post-attach/pre-detach functions are an extension of consconfig because
41*0Sstevel@tonic-gate * they know about the dynamic changes to the stdin device. Neither an
42*0Sstevel@tonic-gate * individual driver nor the DDI framework knows what device is really the
43*0Sstevel@tonic-gate * stdin.
44*0Sstevel@tonic-gate */
45*0Sstevel@tonic-gate /*
46*0Sstevel@tonic-gate * Issues:
47*0Sstevel@tonic-gate * o There are probably race conditions between vx_handler for "read"
48*0Sstevel@tonic-gate * being called by OBP and the update of the polled_input_t
49*0Sstevel@tonic-gate * structure. We need to be careful how the structure is updated.
50*0Sstevel@tonic-gate *
51*0Sstevel@tonic-gate * Solaris/Intel note: While OBP is not in the picture, there are probably
52*0Sstevel@tonic-gate * similar issues with kmdb.
53*0Sstevel@tonic-gate */
54*0Sstevel@tonic-gate
55*0Sstevel@tonic-gate #if defined(MAYBE_SOMETIME)
56*0Sstevel@tonic-gate static void polled_give_input(void);
57*0Sstevel@tonic-gate static void polled_take_input(void);
58*0Sstevel@tonic-gate static void polled_give_output(void);
59*0Sstevel@tonic-gate static void polled_take_output(void);
60*0Sstevel@tonic-gate
61*0Sstevel@tonic-gate static void polled_io_register(cons_polledio_t *,
62*0Sstevel@tonic-gate polled_io_console_type_t, int);
63*0Sstevel@tonic-gate
64*0Sstevel@tonic-gate static void polled_io_unregister(polled_io_console_type_t, int);
65*0Sstevel@tonic-gate
66*0Sstevel@tonic-gate
67*0Sstevel@tonic-gate /*
68*0Sstevel@tonic-gate * Make the registered device become the console for OBP
69*0Sstevel@tonic-gate */
70*0Sstevel@tonic-gate static int polled_io_take_console(polled_io_console_type_t, int);
71*0Sstevel@tonic-gate
72*0Sstevel@tonic-gate /*
73*0Sstevel@tonic-gate * Restore the old console device for OBP.
74*0Sstevel@tonic-gate */
75*0Sstevel@tonic-gate static int polled_io_release_console(polled_io_console_type_t, int);
76*0Sstevel@tonic-gate #endif /* MAYBE_SOMETIME */
77*0Sstevel@tonic-gate
78*0Sstevel@tonic-gate static polled_device_t polled_input_device;
79*0Sstevel@tonic-gate static polled_device_t polled_output_device;
80*0Sstevel@tonic-gate
81*0Sstevel@tonic-gate /*
82*0Sstevel@tonic-gate * This routine is called to initialize polled I/O. We insert our entry
83*0Sstevel@tonic-gate * points so that OBP will call into this code when the switch is thrown
84*0Sstevel@tonic-gate * in polled_io_take_console().
85*0Sstevel@tonic-gate */
86*0Sstevel@tonic-gate void
polled_io_init(void)87*0Sstevel@tonic-gate polled_io_init(void)
88*0Sstevel@tonic-gate {
89*0Sstevel@tonic-gate /*
90*0Sstevel@tonic-gate * Initialize lock to protect multiple thread access to the
91*0Sstevel@tonic-gate * polled_input_device structure. This does not protect
92*0Sstevel@tonic-gate * us from access in OBP mode.
93*0Sstevel@tonic-gate */
94*0Sstevel@tonic-gate mutex_init(&polled_input_device.polled_device_lock,
95*0Sstevel@tonic-gate NULL, MUTEX_DRIVER, NULL);
96*0Sstevel@tonic-gate
97*0Sstevel@tonic-gate /*
98*0Sstevel@tonic-gate * Initialize lock to protect multiple thread access to the
99*0Sstevel@tonic-gate * polled_output_device structure. This does not protect
100*0Sstevel@tonic-gate * us from access in OBP mode.
101*0Sstevel@tonic-gate */
102*0Sstevel@tonic-gate mutex_init(&polled_output_device.polled_device_lock,
103*0Sstevel@tonic-gate NULL, MUTEX_DRIVER, NULL);
104*0Sstevel@tonic-gate }
105*0Sstevel@tonic-gate
106*0Sstevel@tonic-gate /*
107*0Sstevel@tonic-gate * Register a device for input or output. The polled_io structure
108*0Sstevel@tonic-gate * will be filled in with the callbacks that are appropriate for
109*0Sstevel@tonic-gate * that device.
110*0Sstevel@tonic-gate */
111*0Sstevel@tonic-gate int
polled_io_register_callbacks(cons_polledio_t * polled_io,int flags)112*0Sstevel@tonic-gate polled_io_register_callbacks(
113*0Sstevel@tonic-gate cons_polledio_t *polled_io,
114*0Sstevel@tonic-gate int flags
115*0Sstevel@tonic-gate )
116*0Sstevel@tonic-gate {
117*0Sstevel@tonic-gate #if defined(MAYBE_SOMETIME)
118*0Sstevel@tonic-gate /*
119*0Sstevel@tonic-gate * If the input structure entries are filled in, then register this
120*0Sstevel@tonic-gate * structure as an input device.
121*0Sstevel@tonic-gate */
122*0Sstevel@tonic-gate if ((polled_io->cons_polledio_getchar != NULL) &&
123*0Sstevel@tonic-gate (polled_io->cons_polledio_ischar != NULL)) {
124*0Sstevel@tonic-gate
125*0Sstevel@tonic-gate polled_io_register(polled_io,
126*0Sstevel@tonic-gate POLLED_IO_CONSOLE_INPUT, flags);
127*0Sstevel@tonic-gate }
128*0Sstevel@tonic-gate
129*0Sstevel@tonic-gate /*
130*0Sstevel@tonic-gate * If the output structure entries are filled in, then register this
131*0Sstevel@tonic-gate * structure as an output device.
132*0Sstevel@tonic-gate */
133*0Sstevel@tonic-gate if (polled_io->cons_polledio_putchar != NULL) {
134*0Sstevel@tonic-gate
135*0Sstevel@tonic-gate polled_io_register(polled_io,
136*0Sstevel@tonic-gate POLLED_IO_CONSOLE_OUTPUT, flags);
137*0Sstevel@tonic-gate }
138*0Sstevel@tonic-gate #else
139*0Sstevel@tonic-gate _NOTE(ARGUNUSED(flags))
140*0Sstevel@tonic-gate cons_polledio = polled_io;
141*0Sstevel@tonic-gate #endif
142*0Sstevel@tonic-gate
143*0Sstevel@tonic-gate return (DDI_SUCCESS);
144*0Sstevel@tonic-gate }
145*0Sstevel@tonic-gate
146*0Sstevel@tonic-gate /*
147*0Sstevel@tonic-gate * Unregister a device for console input/output.
148*0Sstevel@tonic-gate */
149*0Sstevel@tonic-gate int
polled_io_unregister_callbacks(cons_polledio_t * polled_io,int flags)150*0Sstevel@tonic-gate polled_io_unregister_callbacks(
151*0Sstevel@tonic-gate cons_polledio_t *polled_io,
152*0Sstevel@tonic-gate int flags
153*0Sstevel@tonic-gate )
154*0Sstevel@tonic-gate {
155*0Sstevel@tonic-gate #if defined(MAYBE_SOMETIME)
156*0Sstevel@tonic-gate /*
157*0Sstevel@tonic-gate * If polled_io is being used for input, then unregister it.
158*0Sstevel@tonic-gate */
159*0Sstevel@tonic-gate if (polled_io == polled_input_device.polled_io) {
160*0Sstevel@tonic-gate
161*0Sstevel@tonic-gate polled_io_unregister(
162*0Sstevel@tonic-gate POLLED_IO_CONSOLE_INPUT, flags);
163*0Sstevel@tonic-gate }
164*0Sstevel@tonic-gate
165*0Sstevel@tonic-gate /*
166*0Sstevel@tonic-gate * If polled_io is being used for output, then unregister it.
167*0Sstevel@tonic-gate */
168*0Sstevel@tonic-gate if (polled_io == polled_output_device.polled_io) {
169*0Sstevel@tonic-gate
170*0Sstevel@tonic-gate polled_io_unregister(
171*0Sstevel@tonic-gate POLLED_IO_CONSOLE_OUTPUT, flags);
172*0Sstevel@tonic-gate }
173*0Sstevel@tonic-gate #else
174*0Sstevel@tonic-gate _NOTE(ARGUNUSED(polled_io,flags))
175*0Sstevel@tonic-gate #endif /* MAYBE_SOMETIME */
176*0Sstevel@tonic-gate
177*0Sstevel@tonic-gate return (DDI_SUCCESS);
178*0Sstevel@tonic-gate }
179*0Sstevel@tonic-gate
180*0Sstevel@tonic-gate /*
181*0Sstevel@tonic-gate * This routine is called when we are done handling polled io. We will
182*0Sstevel@tonic-gate * remove all of our handlers and destroy any memory that we have allocated.
183*0Sstevel@tonic-gate */
184*0Sstevel@tonic-gate void
polled_io_fini()185*0Sstevel@tonic-gate polled_io_fini()
186*0Sstevel@tonic-gate {
187*0Sstevel@tonic-gate /*
188*0Sstevel@tonic-gate * Destroy the mutexes, we will not need them anymore.
189*0Sstevel@tonic-gate */
190*0Sstevel@tonic-gate mutex_destroy(&polled_input_device.polled_device_lock);
191*0Sstevel@tonic-gate
192*0Sstevel@tonic-gate mutex_destroy(&polled_output_device.polled_device_lock);
193*0Sstevel@tonic-gate }
194*0Sstevel@tonic-gate
195*0Sstevel@tonic-gate #if defined(MAYBE_SOMETIME)
196*0Sstevel@tonic-gate /*
197*0Sstevel@tonic-gate * Generic internal routine for registering a polled input or output device.
198*0Sstevel@tonic-gate */
199*0Sstevel@tonic-gate /* ARGSUSED */
200*0Sstevel@tonic-gate static void
polled_io_register(cons_polledio_t * polled_io,polled_io_console_type_t type,int flags)201*0Sstevel@tonic-gate polled_io_register(
202*0Sstevel@tonic-gate cons_polledio_t *polled_io,
203*0Sstevel@tonic-gate polled_io_console_type_t type,
204*0Sstevel@tonic-gate int flags
205*0Sstevel@tonic-gate )
206*0Sstevel@tonic-gate {
207*0Sstevel@tonic-gate switch (type) {
208*0Sstevel@tonic-gate case POLLED_IO_CONSOLE_INPUT:
209*0Sstevel@tonic-gate /*
210*0Sstevel@tonic-gate * Grab the device lock, because we are going to access
211*0Sstevel@tonic-gate * protected structure entries. We do this before the
212*0Sstevel@tonic-gate * POLLED_IO_CONSOLE_OPEN_INPUT so that we serialize
213*0Sstevel@tonic-gate * registration.
214*0Sstevel@tonic-gate */
215*0Sstevel@tonic-gate mutex_enter(&polled_input_device.polled_device_lock);
216*0Sstevel@tonic-gate
217*0Sstevel@tonic-gate /*
218*0Sstevel@tonic-gate * Save the polled_io pointers so that we can access
219*0Sstevel@tonic-gate * them later.
220*0Sstevel@tonic-gate */
221*0Sstevel@tonic-gate polled_input_device.polled_io = polled_io;
222*0Sstevel@tonic-gate
223*0Sstevel@tonic-gate mutex_exit(&polled_input_device.polled_device_lock);
224*0Sstevel@tonic-gate
225*0Sstevel@tonic-gate /*
226*0Sstevel@tonic-gate * Tell the generic console framework to
227*0Sstevel@tonic-gate * repoint OBP's stdin to this keyboard device.
228*0Sstevel@tonic-gate */
229*0Sstevel@tonic-gate (void) polled_io_take_console(type, 0);
230*0Sstevel@tonic-gate
231*0Sstevel@tonic-gate break;
232*0Sstevel@tonic-gate
233*0Sstevel@tonic-gate case POLLED_IO_CONSOLE_OUTPUT:
234*0Sstevel@tonic-gate /*
235*0Sstevel@tonic-gate * Grab the device lock, because we are going to access
236*0Sstevel@tonic-gate * protected structure entries. We do this before the
237*0Sstevel@tonic-gate * POLLED_IO_CONSOLE_OPEN_OUTPUT so that we serialize
238*0Sstevel@tonic-gate * registration.
239*0Sstevel@tonic-gate */
240*0Sstevel@tonic-gate mutex_enter(&polled_output_device.polled_device_lock);
241*0Sstevel@tonic-gate
242*0Sstevel@tonic-gate /*
243*0Sstevel@tonic-gate * Save the polled_io pointers so that we can access
244*0Sstevel@tonic-gate * them later.
245*0Sstevel@tonic-gate */
246*0Sstevel@tonic-gate polled_input_device.polled_io = polled_io;
247*0Sstevel@tonic-gate
248*0Sstevel@tonic-gate mutex_exit(&polled_output_device.polled_device_lock);
249*0Sstevel@tonic-gate
250*0Sstevel@tonic-gate break;
251*0Sstevel@tonic-gate }
252*0Sstevel@tonic-gate }
253*0Sstevel@tonic-gate
254*0Sstevel@tonic-gate /*
255*0Sstevel@tonic-gate * Generic internal routine for unregistering a polled input or output device.
256*0Sstevel@tonic-gate */
257*0Sstevel@tonic-gate /* ARGSUSED */
258*0Sstevel@tonic-gate static void
polled_io_unregister(polled_io_console_type_t type,int flags)259*0Sstevel@tonic-gate polled_io_unregister(
260*0Sstevel@tonic-gate polled_io_console_type_t type,
261*0Sstevel@tonic-gate int flags
262*0Sstevel@tonic-gate )
263*0Sstevel@tonic-gate {
264*0Sstevel@tonic-gate switch (type) {
265*0Sstevel@tonic-gate case POLLED_IO_CONSOLE_INPUT:
266*0Sstevel@tonic-gate /*
267*0Sstevel@tonic-gate * Tell the generic console framework to restore OBP's
268*0Sstevel@tonic-gate * old stdin pointers.
269*0Sstevel@tonic-gate */
270*0Sstevel@tonic-gate (void) polled_io_release_console(type, 0);
271*0Sstevel@tonic-gate
272*0Sstevel@tonic-gate /*
273*0Sstevel@tonic-gate * Grab the device lock, because we are going to access
274*0Sstevel@tonic-gate * protected structure entries.
275*0Sstevel@tonic-gate */
276*0Sstevel@tonic-gate mutex_enter(&polled_input_device.polled_device_lock);
277*0Sstevel@tonic-gate
278*0Sstevel@tonic-gate /*
279*0Sstevel@tonic-gate * We are closing the device, so get the value for the op
280*0Sstevel@tonic-gate * pointer. We use the polled_io structure to determine if
281*0Sstevel@tonic-gate * there is a device registered, so null the dev_ops
282*0Sstevel@tonic-gate * structure.
283*0Sstevel@tonic-gate */
284*0Sstevel@tonic-gate polled_input_device.polled_io = NULL;
285*0Sstevel@tonic-gate
286*0Sstevel@tonic-gate mutex_exit(&polled_input_device.polled_device_lock);
287*0Sstevel@tonic-gate
288*0Sstevel@tonic-gate break;
289*0Sstevel@tonic-gate
290*0Sstevel@tonic-gate case POLLED_IO_CONSOLE_OUTPUT:
291*0Sstevel@tonic-gate /*
292*0Sstevel@tonic-gate * Grab the device lock, because we are going to access
293*0Sstevel@tonic-gate * protected structure entries.
294*0Sstevel@tonic-gate */
295*0Sstevel@tonic-gate mutex_enter(&polled_output_device.polled_device_lock);
296*0Sstevel@tonic-gate
297*0Sstevel@tonic-gate /*
298*0Sstevel@tonic-gate * We are closing the device, so get the value for the op
299*0Sstevel@tonic-gate * pointer. We use the polled_io structure to determine if
300*0Sstevel@tonic-gate * there is a device registered.
301*0Sstevel@tonic-gate */
302*0Sstevel@tonic-gate polled_output_device.polled_io = NULL;
303*0Sstevel@tonic-gate
304*0Sstevel@tonic-gate mutex_exit(&polled_output_device.polled_device_lock);
305*0Sstevel@tonic-gate
306*0Sstevel@tonic-gate break;
307*0Sstevel@tonic-gate }
308*0Sstevel@tonic-gate }
309*0Sstevel@tonic-gate
310*0Sstevel@tonic-gate /*
311*0Sstevel@tonic-gate * This is the routine that is called to throw the switch from boot
312*0Sstevel@tonic-gate * ownership of stdout/stdin to the kernel.
313*0Sstevel@tonic-gate */
314*0Sstevel@tonic-gate /* ARGSUSED */
315*0Sstevel@tonic-gate static int
polled_io_take_console(polled_io_console_type_t type,int flags)316*0Sstevel@tonic-gate polled_io_take_console(
317*0Sstevel@tonic-gate polled_io_console_type_t type,
318*0Sstevel@tonic-gate int flags
319*0Sstevel@tonic-gate )
320*0Sstevel@tonic-gate {
321*0Sstevel@tonic-gate switch (type) {
322*0Sstevel@tonic-gate case POLLED_IO_CONSOLE_INPUT:
323*0Sstevel@tonic-gate /*
324*0Sstevel@tonic-gate * Perhaps this should be where we switch *sysp
325*0Sstevel@tonic-gate */
326*0Sstevel@tonic-gate break;
327*0Sstevel@tonic-gate
328*0Sstevel@tonic-gate case POLLED_IO_CONSOLE_OUTPUT:
329*0Sstevel@tonic-gate /*
330*0Sstevel@tonic-gate * Perhaps this should be where we switch *sysp
331*0Sstevel@tonic-gate */
332*0Sstevel@tonic-gate break;
333*0Sstevel@tonic-gate }
334*0Sstevel@tonic-gate
335*0Sstevel@tonic-gate return (DDI_SUCCESS);
336*0Sstevel@tonic-gate }
337*0Sstevel@tonic-gate
338*0Sstevel@tonic-gate /*
339*0Sstevel@tonic-gate * This routine gives control of console input/output back to ???.
340*0Sstevel@tonic-gate *
341*0Sstevel@tonic-gate * Solaris/Intel has nobody to give it back to. Hope we don't get here!
342*0Sstevel@tonic-gate */
343*0Sstevel@tonic-gate /* ARGSUSED */
344*0Sstevel@tonic-gate static int
polled_io_release_console(polled_io_console_type_t type,int flags)345*0Sstevel@tonic-gate polled_io_release_console(
346*0Sstevel@tonic-gate polled_io_console_type_t type,
347*0Sstevel@tonic-gate int flags
348*0Sstevel@tonic-gate )
349*0Sstevel@tonic-gate {
350*0Sstevel@tonic-gate cmn_err(CE_WARN,
351*0Sstevel@tonic-gate "polled_io_release_console: nobody to hand console back to");
352*0Sstevel@tonic-gate
353*0Sstevel@tonic-gate return (DDI_SUCCESS);
354*0Sstevel@tonic-gate }
355*0Sstevel@tonic-gate
356*0Sstevel@tonic-gate /*
357*0Sstevel@tonic-gate * This is the routine that kmdb calls to save any state information
358*0Sstevel@tonic-gate * before using the input device. This routine, and all of the
359*0Sstevel@tonic-gate * routines that it calls, are responsible for saving any state
360*0Sstevel@tonic-gate * information so that it can be restored when polled mode is over.
361*0Sstevel@tonic-gate */
362*0Sstevel@tonic-gate static void
polled_give_input(void)363*0Sstevel@tonic-gate polled_give_input(void)
364*0Sstevel@tonic-gate {
365*0Sstevel@tonic-gate cons_polledio_t *polled_io;
366*0Sstevel@tonic-gate
367*0Sstevel@tonic-gate /*
368*0Sstevel@tonic-gate * We check the dev_ops pointer to see if there is an
369*0Sstevel@tonic-gate * input device that has been registered.
370*0Sstevel@tonic-gate */
371*0Sstevel@tonic-gate polled_io = polled_input_device.polled_io;
372*0Sstevel@tonic-gate
373*0Sstevel@tonic-gate if (polled_io == NULL || polled_io->cons_polledio_enter == NULL) {
374*0Sstevel@tonic-gate return;
375*0Sstevel@tonic-gate }
376*0Sstevel@tonic-gate
377*0Sstevel@tonic-gate /*
378*0Sstevel@tonic-gate * Call down to the lower layers to save the state.
379*0Sstevel@tonic-gate */
380*0Sstevel@tonic-gate polled_io->cons_polledio_enter(
381*0Sstevel@tonic-gate polled_io->cons_polledio_argument);
382*0Sstevel@tonic-gate }
383*0Sstevel@tonic-gate
384*0Sstevel@tonic-gate /*
385*0Sstevel@tonic-gate * This is the routine that kmdb calls when it is giving up control of the
386*0Sstevel@tonic-gate * input device. This routine, and the lower layer routines that it calls,
387*0Sstevel@tonic-gate * are responsible for restoring the controller state to the state it was
388*0Sstevel@tonic-gate * in before kmdb took control.
389*0Sstevel@tonic-gate */
390*0Sstevel@tonic-gate static void
polled_take_input(void)391*0Sstevel@tonic-gate polled_take_input(void)
392*0Sstevel@tonic-gate {
393*0Sstevel@tonic-gate cons_polledio_t *polled_io;
394*0Sstevel@tonic-gate
395*0Sstevel@tonic-gate /*
396*0Sstevel@tonic-gate * We check the dev_ops pointer to see if there is an
397*0Sstevel@tonic-gate * input device that has been registered.
398*0Sstevel@tonic-gate */
399*0Sstevel@tonic-gate polled_io = polled_input_device.polled_io;
400*0Sstevel@tonic-gate
401*0Sstevel@tonic-gate if (polled_io == NULL || polled_io->cons_polledio_exit == NULL) {
402*0Sstevel@tonic-gate return;
403*0Sstevel@tonic-gate }
404*0Sstevel@tonic-gate
405*0Sstevel@tonic-gate /*
406*0Sstevel@tonic-gate * Call down to the lower layers to save the state.
407*0Sstevel@tonic-gate */
408*0Sstevel@tonic-gate polled_io->cons_polledio_exit(
409*0Sstevel@tonic-gate polled_io->cons_polledio_argument);
410*0Sstevel@tonic-gate }
411*0Sstevel@tonic-gate
412*0Sstevel@tonic-gate /*
413*0Sstevel@tonic-gate * This is the routine that kmdb calls to save any state information
414*0Sstevel@tonic-gate * before using the output device. This routine, and all of the
415*0Sstevel@tonic-gate * routines that it calls, are responsible for saving any state
416*0Sstevel@tonic-gate * information so that it can be restored when polled mode is over.
417*0Sstevel@tonic-gate */
418*0Sstevel@tonic-gate static void
polled_give_output()419*0Sstevel@tonic-gate polled_give_output()
420*0Sstevel@tonic-gate {
421*0Sstevel@tonic-gate cons_polledio_t *polled_io;
422*0Sstevel@tonic-gate
423*0Sstevel@tonic-gate /*
424*0Sstevel@tonic-gate * We check the dev_ops pointer to see if there is an
425*0Sstevel@tonic-gate * output device that has been registered.
426*0Sstevel@tonic-gate */
427*0Sstevel@tonic-gate polled_io = polled_output_device.polled_io;
428*0Sstevel@tonic-gate
429*0Sstevel@tonic-gate if (polled_io == NULL || polled_io->cons_polledio_enter == NULL) {
430*0Sstevel@tonic-gate return;
431*0Sstevel@tonic-gate }
432*0Sstevel@tonic-gate
433*0Sstevel@tonic-gate /*
434*0Sstevel@tonic-gate * Call down to the lower layers to save the state.
435*0Sstevel@tonic-gate */
436*0Sstevel@tonic-gate polled_io->cons_polledio_enter(
437*0Sstevel@tonic-gate polled_io->cons_polledio_argument);
438*0Sstevel@tonic-gate }
439*0Sstevel@tonic-gate
440*0Sstevel@tonic-gate /*
441*0Sstevel@tonic-gate * This is the routine that kmdb calls when it is giving up control of the
442*0Sstevel@tonic-gate * output device. This routine, and the lower layer routines that it calls,
443*0Sstevel@tonic-gate * are responsible for restoring the controller state to the state it was
444*0Sstevel@tonic-gate * in before kmdb took control.
445*0Sstevel@tonic-gate */
446*0Sstevel@tonic-gate static void
polled_take_output(void)447*0Sstevel@tonic-gate polled_take_output(void)
448*0Sstevel@tonic-gate {
449*0Sstevel@tonic-gate cons_polledio_t *polled_io;
450*0Sstevel@tonic-gate
451*0Sstevel@tonic-gate /*
452*0Sstevel@tonic-gate * We check the dev_ops pointer to see if there is an
453*0Sstevel@tonic-gate * output device that has been registered.
454*0Sstevel@tonic-gate */
455*0Sstevel@tonic-gate polled_io = polled_output_device.polled_io;
456*0Sstevel@tonic-gate
457*0Sstevel@tonic-gate if (polled_io == NULL || polled_io->cons_polledio_exit == NULL) {
458*0Sstevel@tonic-gate return;
459*0Sstevel@tonic-gate }
460*0Sstevel@tonic-gate
461*0Sstevel@tonic-gate /*
462*0Sstevel@tonic-gate * Call down to the lower layers to save the state.
463*0Sstevel@tonic-gate */
464*0Sstevel@tonic-gate polled_io->cons_polledio_exit(
465*0Sstevel@tonic-gate polled_io->cons_polledio_argument);
466*0Sstevel@tonic-gate }
467*0Sstevel@tonic-gate #endif /* MAYBE_SOMETIME */
468