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comparison vordog.c @ 8:a28764b2a28e

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modify selection of timeout for 2^n nanoseconds
author Thinker K.F. Li <thinker@branda.to>
date Tue, 08 Jul 2008 17:10:01 +0800
parents 5a281ce7453c
children b4f4a69ea86a
comparison
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7:5a281ce7453c 8:a28764b2a28e
199 * 199 *
200 * Since, only SFTMR1_STS is work, in my experience, and it is triggered 200 * Since, only SFTMR1_STS is work, in my experience, and it is triggered
201 * after 4 times of initial value. So, it only (i * 4) seconds in range 201 * after 4 times of initial value. So, it only (i * 4) seconds in range
202 * of 4 ~ (255 * 4), where i is one of positive integer, are supported. 202 * of 4 ~ (255 * 4), where i is one of positive integer, are supported.
203 * 203 *
204 * The supported time intervals of watchdog(9) are 2^31~2^39 nanoseconds. 204 * The supported time intervals of watchdog(9) are 2^32~2^39 nanoseconds.
205 * vordog used a (i * 4) seconds for 2^n seconds while i * 4 seconds is 205 * vordog used a (i * 4) seconds for 2^n seconds while i * 4 seconds is
206 * smallest one of intervals that bigger than 2^n seconds. 206 * closest to 2^n nanoseconds. The variances between i * 4 seconds and
207 * 2^n nanoseconds are less than 7% (6.8678%).
207 */ 208 */
208 static void 209 static void
209 vordog_wd9_evh(void *priv_data, u_int cmd, int *error) { 210 vordog_wd9_evh(void *priv_data, u_int cmd, int *error) {
210 vd_softc_t sc; 211 vd_softc_t sc;
211 u_int timeout, u; 212 u_int timeout, u;
212 /* 2^31, 2^32, ..., 2^39 nanoseconds */ 213 /* 2^32, 2^33, ..., 2^39 nanoseconds */
213 static const int timeouts[] = { 1, 2, 3, 5, 9, 18, 35, 69, 138}; 214 static const int timeouts[] = { 1, 2, 4, 9, 17, 34, 69, 137};
214 215
215 sc = (vd_softc_t)priv_data; 216 sc = (vd_softc_t)priv_data;
216 217
217 u = cmd & WD_INTERVAL; 218 u = cmd & WD_INTERVAL;
218 if(u < 31 || u > 39) { 219 if(u < 32 || u > 39) {
219 /* Out of range! Can not be configured. */ 220 /* Out of range! Can not be configured. */
220 vordog_wd9_disable(); 221 vordog_wd9_disable();
221 sc->init_val = 0; 222 sc->init_val = 0;
222 return; 223 return;
223 } 224 }