diff options
Diffstat (limited to 'payloads/libpayload/arch/arm64/lib/clock.c')
-rw-r--r-- | payloads/libpayload/arch/arm64/lib/clock.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/payloads/libpayload/arch/arm64/lib/clock.c b/payloads/libpayload/arch/arm64/lib/clock.c new file mode 100644 index 0000000000..9f06f0828c --- /dev/null +++ b/payloads/libpayload/arch/arm64/lib/clock.c @@ -0,0 +1,40 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2014 Google Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * clock.c: Functions for accessing clock and timer related registers + * Reference: ARM Architecture Reference Manual, ARMv8-A edition + */ + +#include <stdint.h> + +#include <arch/lib_helpers.h> + +void set_cntfrq(uint32_t freq) +{ + __asm__ __volatile__("msr cntfrq_el0, %0" :: "r"(freq)); +} |