mirror of
https://github.com/projectacrn/acrn-hypervisor.git
synced 2025-12-02 15:14:33 +00:00
aa3febbe26
For arch specific codes, we use arch_xxx() to name the function. So, rename cpu_ticks/cpu_tickrate/set_hw_timeout/init_hw_timer to follow this convention. Then, use arch interface to set timeout value in update_physical_timer(). Furthermore, remove hw_timer.h and move its contents into common/ timer.h. Tracked-On: #8792 Signed-off-by: Yi Y Sun <yi.y.sun@intel.com> Acked-by: Wang, Yu1 <yu1.wang@intel.com>
65 lines
1.5 KiB
ReStructuredText
65 lines
1.5 KiB
ReStructuredText
.. _timer-hld:
|
|
|
|
Timer
|
|
#####
|
|
|
|
Because ACRN is a flexible, lightweight reference hypervisor, we provide
|
|
limited timer management services:
|
|
|
|
- Only the LAPIC tsc-deadline timer is supported as the clock source.
|
|
|
|
- A timer can only be added on the logical CPU for a process or thread. Timer
|
|
scheduling or timer migrating is not supported.
|
|
|
|
How It Works
|
|
************
|
|
|
|
When the system boots, we check that the hardware supports the LAPIC
|
|
tsc-deadline timer by checking CPUID.01H:ECX.TSC_Deadline[bit 24]. If
|
|
support is missing, we output an error message and panic the hypervisor.
|
|
If supported, we register the timer interrupt callback that raises a
|
|
timer softirq on each logical CPU and sets the LAPIC timer mode to
|
|
tsc-deadline timer mode by writing the local APIC LVT register.
|
|
|
|
Data Structures and APIs
|
|
************************
|
|
|
|
Interfaces Design
|
|
=================
|
|
|
|
.. doxygenfunction:: initialize_timer
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: timer_expired
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: timer_is_started
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: add_timer
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: del_timer
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: timer_init
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: calibrate_tsc
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: cpu_ticks
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: us_to_ticks
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: ticks_to_us
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: ticks_to_ms
|
|
:project: Project ACRN
|
|
|
|
.. doxygenfunction:: udelay
|
|
:project: Project ACRN
|