[PATCH] Doc/hpet.txt: change to < 80 columns
Put text into < 80 columns. No other changes. Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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High Precision Event Timer Driver for Linux
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The High Precision Event Timer (HPET) hardware is the future replacement for the 8254 and Real
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Time Clock (RTC) periodic timer functionality. Each HPET can have up two 32 timers. It is possible
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to configure the first two timers as legacy replacements for 8254 and RTC periodic. A specification
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done by INTEL and Microsoft can be found at http://www.intel.com/labs/platcomp/hpet/hpetspec.htm.
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The High Precision Event Timer (HPET) hardware is the future replacement
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for the 8254 and Real Time Clock (RTC) periodic timer functionality.
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Each HPET can have up two 32 timers. It is possible to configure the
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first two timers as legacy replacements for 8254 and RTC periodic timers.
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A specification done by Intel and Microsoft can be found at
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<http://www.intel.com/hardwaredesign/hpetspec.htm>.
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The driver supports detection of HPET driver allocation and initialization of the HPET before the
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driver module_init routine is called. This enables platform code which uses timer 0 or 1 as the
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main timer to intercept HPET initialization. An example of this initialization can be found in
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The driver supports detection of HPET driver allocation and initialization
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of the HPET before the driver module_init routine is called. This enables
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platform code which uses timer 0 or 1 as the main timer to intercept HPET
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initialization. An example of this initialization can be found in
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arch/i386/kernel/time_hpet.c.
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The driver provides two APIs which are very similar to the API found in the rtc.c driver.
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There is a user space API and a kernel space API. An example user space program is provided
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below.
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The driver provides two APIs which are very similar to the API found in
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the rtc.c driver. There is a user space API and a kernel space API.
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An example user space program is provided below.
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#include <stdio.h>
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#include <stdlib.h>
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@ -290,9 +293,8 @@ The kernel API has three interfaces exported from the driver:
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hpet_unregister(struct hpet_task *tp)
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hpet_control(struct hpet_task *tp, unsigned int cmd, unsigned long arg)
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The kernel module using this interface fills in the ht_func and ht_data members of the
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hpet_task structure before calling hpet_register. hpet_control simply vectors to the hpet_ioctl
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routine and has the same commands and respective arguments as the user API. hpet_unregister
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The kernel module using this interface fills in the ht_func and ht_data
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members of the hpet_task structure before calling hpet_register.
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hpet_control simply vectors to the hpet_ioctl routine and has the same
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commands and respective arguments as the user API. hpet_unregister
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is used to terminate usage of the HPET timer reserved by hpet_register.
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