Minoca-os/kernel/hl/armv7/gta.S

/*++

Copyright (c) 2016 Minoca Corp. All Rights Reserved

Module Name:

    gta.S

Abstract:

    This module implements support for accessing ARM Generic Timer registers.

Author:

    Chris Stevens 23-May-2016

Environment:

    Kernel mode

--*/

##
## ------------------------------------------------------------------ Includes
##

#include <minoca/kernel/arm.inc>

##
## --------------------------------------------------------------- Definitions
##

##
## ---------------------------------------------------------------------- Code
##

ASSEMBLY_FILE_HEADER

##
## ULONG
## HlpGtGetFrequency (
##     VOID
##     )
##

/*++

Routine Description:

    This routine retrieves the CNTFRQ register.

Arguments:

    None.

Return Value:

    Returns the value of the CNTFRQ.

--*/

FUNCTION HlpGtGetFrequency
    mrc     p15, 0, %r0, %c14, %c0, 0          @ Get the CNTFRQ
    bx      %lr                                @

END_FUNCTION HlpGtGetFrequency

##
## VOID
## HlpGtSetVirtualTimerControl (
##     ULONG Control
##     )
##

/*++

Routine Description:

    This routine sets the CNTV_CTL register.

Arguments:

    Control - Supplies the control value to set in the CNTV_CTL.

Return Value:

    None.

--*/

FUNCTION HlpGtSetVirtualTimerControl
    mcr     p15, 0, %r0, %c14, %c3, 1          @ Set the CNTV_CTL
    bx      %lr                                @

END_FUNCTION HlpGtSetVirtualTimerControl

##
## ULONGLONG
## HlpGtGetVirtualCount (
##     VOID
##     )
##

/*++

Routine Description:

    This routine retrieves the CNTVCT register.

Arguments:

    None.

Return Value:

    Returns the value of the CNTVCT.

--*/

FUNCTION HlpGtGetVirtualCount
    mrrc    p15, 1, %r0, %r1, %c14             @ Get the CNTVCT
    bx      %lr                                @

END_FUNCTION HlpGtGetVirtualCount

##
## VOID
## HlpGtSetVirtualTimerCompare (
##     ULONGLONG CompareValue
##     )
##

/*++

Routine Description:

    This routine retrieves the CNTV_CVAL register.

Arguments:

    CompareValue - Supplies the compare value to set in the CNTV_CVAL register.

Return Value:

    None.

--*/

FUNCTION HlpGtSetVirtualTimerCompare
    mcrr    p15, 3, %r0, %r1, %c14             @ Set the CNTV_CVAL
    bx      %lr                                @

END_FUNCTION HlpGtSetVirtualTimerCompare

##
## --------------------------------------------------------- Internal Functions
##