xref: /haiku/src/system/libroot/os/arch/riscv64/system_time.cpp (revision 97f11716bfaa0f385eb0e28a52bf56a5023b9e99) 
1*64bc3019SX512 /*
2*64bc3019SX512  * Copyright 2012-2021, Haiku, Inc. All rights reserved.
3*64bc3019SX512  * Distributed under the terms of the MIT License.
4*64bc3019SX512  *
5*64bc3019SX512  * Authors:
6*64bc3019SX512  *		François Revol <revol@free.fr>
7*64bc3019SX512  */
8*64bc3019SX512 
9*64bc3019SX512 #include <OS.h>
10*64bc3019SX512 
11*64bc3019SX512 #include <arch_cpu.h>
12*64bc3019SX512 #include <arch_cpu_defs.h>
13*64bc3019SX512 #include <libroot_private.h>
14*64bc3019SX512 #include <real_time_data.h>
15*64bc3019SX512 
16*64bc3019SX512 #ifdef _KERNEL_MODE
17*64bc3019SX512 #include <KernelExport.h>
18*64bc3019SX512 #endif
19*64bc3019SX512 
20*64bc3019SX512 
21*64bc3019SX512 static uint64_t cv_factor = 0;
22*64bc3019SX512 
23*64bc3019SX512 
24*64bc3019SX512 extern "C" void
__riscv64_setup_system_time(uint64 cv)25*64bc3019SX512 __riscv64_setup_system_time(uint64 cv)
26*64bc3019SX512 {
27*64bc3019SX512 	cv_factor = cv;
28*64bc3019SX512 }
29*64bc3019SX512 
30*64bc3019SX512 
31*64bc3019SX512 [[gnu::optimize("omit-frame-pointer")]] bigtime_t
system_time()32*64bc3019SX512 system_time()
33*64bc3019SX512 {
34*64bc3019SX512 	__uint128_t time = static_cast<__uint128_t>(CpuTime()) * cv_factor;
35*64bc3019SX512 	return time >> 32;
36*64bc3019SX512 }
37