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hwtimer.c (71867) hwtimer.c (73561)
1
2/******************************************************************************
3 *
4 * Name: hwtimer.c - ACPI Power Management Timer Interface
1
2/******************************************************************************
3 *
4 * Name: hwtimer.c - ACPI Power Management Timer Interface
5 * $Revision: 4 $
5 * $Revision: 5 $
6 *
7 *****************************************************************************/
8
9/******************************************************************************
10 *
11 * 1. Copyright Notice
12 *
13 * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.

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230 if (!TimeElapsed)
231 {
232 return_ACPI_STATUS (AE_BAD_PARAMETER);
233 }
234
235 /*
236 * Compute Tick Delta:
237 * -------------------
6 *
7 *****************************************************************************/
8
9/******************************************************************************
10 *
11 * 1. Copyright Notice
12 *
13 * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.

--- 216 unchanged lines hidden (view full) ---

230 if (!TimeElapsed)
231 {
232 return_ACPI_STATUS (AE_BAD_PARAMETER);
233 }
234
235 /*
236 * Compute Tick Delta:
237 * -------------------
238 * Handle timer rollovers on 24- versus 32-bit timers.
238 * Handle (max one) timer rollovers on 24- versus 32-bit timers.
239 */
240 if (StartTicks < EndTicks)
241 {
242 DeltaTicks = EndTicks - StartTicks;
243 }
244 else if (StartTicks > EndTicks)
245 {
246 /* 24-bit Timer */
247 if (0 == AcpiGbl_FADT->TmrValExt)
248 {
239 */
240 if (StartTicks < EndTicks)
241 {
242 DeltaTicks = EndTicks - StartTicks;
243 }
244 else if (StartTicks > EndTicks)
245 {
246 /* 24-bit Timer */
247 if (0 == AcpiGbl_FADT->TmrValExt)
248 {
249 DeltaTicks = (0x00FFFFFF - StartTicks) + EndTicks;
249 DeltaTicks = (((0x00FFFFFF - StartTicks) + EndTicks) & 0x00FFFFFF);
250 }
251 /* 32-bit Timer */
252 else
253 {
254 DeltaTicks = (0xFFFFFFFF - StartTicks) + EndTicks;
255 }
256 }
250 }
251 /* 32-bit Timer */
252 else
253 {
254 DeltaTicks = (0xFFFFFFFF - StartTicks) + EndTicks;
255 }
256 }
257 else
258 {
259 *TimeElapsed = 0;
260 return_ACPI_STATUS (AE_OK);
261 }
257
258 /*
259 * Compute Duration:
260 * -----------------
261 * Since certain compilers (gcc/Linux, argh!) don't support 64-bit
262 * divides in kernel-space we have to do some trickery to preserve
263 * accuracy while using 32-bit math.
264 *

--- 38 unchanged lines hidden --- 		262
263 /*
264 * Compute Duration:
265 * -----------------
266 * Since certain compilers (gcc/Linux, argh!) don't support 64-bit
267 * divides in kernel-space we have to do some trickery to preserve
268 * accuracy while using 32-bit math.
269 *

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