osfmk/i386/hpet.c

7  * as defined in and that are subject to the Apple Public Source License
9  * compliance with the License. The rights granted to you under the License
10  * may not be used to create, or enable the creation or redistribution of,
11  * unlawful or unlicensed copies of an Apple operating system, or to
105  * This routine is called to obtain an HPET and have it assigned
106  * to a CPU.  It returns 0 if successful and non-zero if one could
172      * add the HPET to the package too.
215 	xmod = (uint32_t *)(rcbaArea + 0x3404);	/* Point to the HPTC */
220 		    "enabling and assigning to 0xFED00000 (hope that's ok)\n");
234 	 * and convert to frequency in hertz.
241 	 * with about 32 bits of fraction.  The value is converted to a
242 	 * base-2 fixed point number.  To convert from HPET to nanoseconds,
244 	 * then shift right 32 bits.  If the value is known to be small,
249 	 * Begin conversion of base 10 femtoseconds to base 2, calculate:
250 	 *  - HPET ticks to nanoseconds conversion in base 2 fraction (* 2**32)
251 	 *  - nanoseconds to HPET ticks conversion
264 	 * Begin conversion of base 10 femtoseconds to base 2
265 	 * HPET ticks to nanoseconds in base 2 fraction (times 1048576)
270 	/* Calculate conversion from TSC to HPET */
272 	DBG(" CVT: TSC to HPET = %08X.%08X\n",
275 	/* Calculate conversion from HPET to TSC */
277 	DBG(" CVT: HPET to TSC = %08X.%08X\n",
280 	/* Calculate conversion from BUS to HPET */
282 	DBG(" CVT: BUS to HPET = %08X.%08X\n",
285 	/* Calculate conversion from HPET to BUS */
287 	DBG(" CVT: HPET to BUS = %08X.%08X\n",
292  * This routine is used to get various information about the HPET
293  * without having to export gobs of globals.  It fills in a data
317  * when it assigns an HPET timer to a processor.
370 	 * ahead and add the HPET to the package too.
384  * It just hands off to the power management code so that the
391 	/* All we do here is to bump the count */
410 	hpetReg_t	*to = &saved_hpet;
412 	to->GEN_CONF  = from->GEN_CONF;
413 	to->TIM0_CONF = from->TIM0_CONF;
414 	to->TIM0_COMP = from->TIM0_COMP;
415 	to->TIM1_CONF = from->TIM1_CONF;
416 	to->TIM1_COMP = from->TIM1_COMP;
417 	to->TIM2_CONF = from->TIM2_CONF;
418 	to->TIM2_COMP = from->TIM2_COMP;
419 	to->MAIN_CNT  = from->MAIN_CNT;
426 	hpetReg_t	*to = (hpetReg_t *) hpetArea;
436 		    "enabling and assigning to 0xFED00000 (hope that's ok)\n");
440 	to->GEN_CONF  = from->GEN_CONF & ~1;
442 	to->TIM0_CONF = from->TIM0_CONF;
443 	to->TIM0_COMP = from->TIM0_COMP;
444 	to->TIM1_CONF = from->TIM1_CONF;
445 	to->TIM1_COMP = from->TIM1_COMP;
446 	to->TIM2_CONF = from->TIM2_CONF;
447 	to->TIM2_COMP = from->TIM2_COMP;
448 	to->GINTR_STA = -1ULL;
449 	to->MAIN_CNT  = from->MAIN_CNT;
451 	to->GEN_CONF = from->GEN_CONF;