![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to machine_clock.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Apple Darwin 0.x] / kernel / machdep / ppc|
Return to machine_clock.c CVS log | Up to [Apple Darwin 0.x] / kernel / machdep / ppc |
1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /*
26: * Copyright (c) 1992, 1993, 1994, 1995 NeXT Computer, Inc.
27: *
28: * Machine dependent clock and timer routines
29: * for ppc architecture. Ported from hppa/sparc.
30: *
31: */
32:
33: #include <mach/mach_types.h>
34:
35: #include <bsd/sys/param.h>
36: #include <bsd/sys/time.h>
37:
38: #import <kern/clock.h>
39: #import <vm/vm_kern.h>
40:
41: /* Window server in action flag */
42: extern unsigned int wserver_on;
43: extern unsigned int get_unix_time_of_day( void );
44: extern void set_unix_time_of_day( unsigned int unixSecs );
45:
46: boolean_t clock_initialized = FALSE;
47:
48: tvalspec_t time_of_boot; /* rel to 1/1/70 (UNIX T[0]) */
49:
50: /*
51: * Nanosecond event counter ;-)
52: */
53:
54: static struct _system_clock {
55: mapped_tvalspec_t *mapped_counter;
56: } system_clock;
57:
58: static tvalspec_t system_time_stamp(void);
59:
60: static struct _system_timer {
61: boolean_t is_set;
62: tvalspec_t expire_time;
63: timer_func_t expire_func;
64: } system_timer;
65:
66: static boolean_t hardclock_enabled;
67:
68: void
69: ppc_hardclock(struct ppc_saved_state *ssp)
70: {
71: tvalspec_t now;
72:
73: if (hardclock_enabled) {
74: clock_interrupt(tick, USERMODE(ssp->srr1), BASEPRI(ssp->srr1));
75: hardclock(ssp->srr0, ssp->srr1);
76: }
77:
78: read_processor_clock_tval(&now);
79:
80: if (system_timer.is_set &&
81: CMP_TVALSPEC(&system_timer.expire_time, &now) <= 0) {
82: system_timer.is_set = FALSE;
83: (*system_timer.expire_func)(now);
84: }
85: }
86:
87: void
88: hardclock_init(void)
89: {
90: hardclock_enabled = TRUE;
91: }
92:
93: /*
94: * Initialize the clock and timer interface.
95: */
96: void
97: machine_clock_init(void)
98: {
99: /*
100: * Initialixe the RTC, and set the system's idea of time.
101: */
102:
103: rtc_init();
104:
105: // Set the boot time to zero. It will be updated when the
106: // via (Cuda or PMU) driver is probed.
107: time_of_boot.tv_sec = 0;
108:
109: clock_initialized = TRUE;
110: }
111:
112: /*
113: * Set the systems real boot time now that DriverKit has given us
114: * access to a Time Of Day clock.
115: */
116: void
117: set_boot_time(void)
118: {
119: time_of_boot.tv_sec =
120: get_unix_time_of_day() - clock_get_counter(System).tv_sec;
121: }
122:
123: /*
124: * Clock functions
125: */
126: tvalspec_t
127: clock_get_counter(
128: clock_type_t which_clock
129: )
130: {
131: tvalspec_t result = system_time_stamp();
132:
133: switch (which_clock) {
134:
135: case System:
136: break;
137:
138: case Calendar: {
139: int s = splusclock();
140:
141: ADD_TVALSPEC(&result, &time_of_boot);
142: splx(s);
143: break;
144: }
145:
146: default:
147: result = TVALSPEC_ZERO;
148: break;
149: }
150:
151: return (result);
152: }
153:
154: void
155: clock_set_counter(
156: clock_type_t which_clock,
157: tvalspec_t value
158: )
159: {
160: tvalspec_t counter = system_time_stamp();
161:
162: switch (which_clock) {
163:
164: case Calendar: {
165: int s = splusclock();
166:
167: time_of_boot = value;
168: SUB_TVALSPEC(&time_of_boot, &counter);
169: splx(s);
170: set_unix_time_of_day( value.tv_sec );
171: break;
172: }
173:
174: default:
175: /* Can only set the calendar */
176: break;
177: }
178: }
179:
180: void
181: clock_adjust_counter(
182: clock_type_t which_clock,
183: clock_res_t nsec
184: )
185: {
186: switch (which_clock) {
187:
188: case Calendar: {
189: int s = splusclock();
190:
191: ADD_TVALSPEC_NSEC(&time_of_boot, nsec);
192: splx(s);
193: break;
194: }
195:
196: default:
197: /* Can only adjust the calendar */
198: break;
199: }
200: }
201:
202: mapped_tvalspec_t *
203: clock_map_counter(
204: clock_type_t which_clock
205: )
206: {
207: mapped_tvalspec_t *mapped_clock;
208:
209: switch (which_clock) {
210:
211: case System:
212: if (!(mapped_clock = system_clock.mapped_counter)) {
213: int s;
214:
215: if (kmem_alloc_wired(kernel_map,
216: (vm_offset_t *)&mapped_clock,
217: PAGE_SIZE) != KERN_SUCCESS) {
218: mapped_clock = 0;
219: break;
220: }
221: s = splusclock();
222: system_clock.mapped_counter = mapped_clock;
223: splx(s);
224: }
225: break;
226:
227: default:
228: mapped_clock = 0;
229: break;
230: }
231:
232: return (mapped_clock);
233: }
234:
235: void
236: timer_set_expire_func(
237: timer_type_t which_timer,
238: timer_func_t expire_func
239: )
240: {
241: switch (which_timer) {
242:
243: case SystemWide:
244: if (!expire_func || !system_timer.expire_func) {
245: int s = splusclock();
246:
247: system_timer.expire_func = expire_func;
248: system_timer.is_set = FALSE;
249: splx(s);
250: }
251: break;
252:
253: default:
254: break;
255: }
256: }
257:
258: void
259: timer_set_deadline(
260: timer_type_t which_timer,
261: tvalspec_t deadline
262: )
263: {
264: switch (which_timer) {
265:
266: case SystemWide:
267: if (system_timer.expire_func) {
268: int s = splusclock();
269:
270: system_timer.expire_time = deadline;
271: system_timer.is_set = TRUE;
272: splx(s);
273: }
274: break;
275:
276: default:
277: break;
278: }
279: }
280:
281: /*
282: * Get current clock value plus fraction of a tick.
283: */
284: static tvalspec_t
285: system_time_stamp(void)
286: {
287: tvalspec_t result;
288:
289: read_processor_clock_tval(&result);
290:
291: return (result);
292: }
293:
294: /* Return 32 bit representation of event counter */
295: unsigned int
296: event_get(void)
297: {
298: return (system_time_stamp().tv_nsec);
299: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.