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[PATCH 2/6] RISC-V: Add nanosleep functionality
- From: Kito Cheng <kito dot cheng at gmail dot com>
- To: Newlib <newlib at sourceware dot org>
- Cc: patches at groups dot riscv dot org, Jim Wilson <jimw at sifive dot com>
- Date: Sun, 17 Dec 2017 17:34:17 +0800
- Subject: [PATCH 2/6] RISC-V: Add nanosleep functionality
- Authentication-results: sourceware.org; auth=none
From c6fc637082264f816f86ed1bd04fa9b5d90e51ee Mon Sep 17 00:00:00 2001
From: Rishi Khan <rishi@extreme-scale.com>
Date: Fri, 27 Oct 2017 18:22:11 +0000
Subject: [PATCH 2/6] RISC-V: Add nanosleep functionality
---
libgloss/riscv/Makefile.in | 1 +
libgloss/riscv/nanosleep.c | 12 ++++++++++++
newlib/configure.host | 2 +-
3 files changed, 14 insertions(+), 1 deletion(-)
create mode 100644 libgloss/riscv/nanosleep.c
diff --git a/libgloss/riscv/Makefile.in b/libgloss/riscv/Makefile.in
index 2f03f44..de4ea8d 100644
--- a/libgloss/riscv/Makefile.in
+++ b/libgloss/riscv/Makefile.in
@@ -7,6 +7,7 @@ gloss_hdrs = \
gloss_srcs = \
syscalls.c \
+ nanosleep.c
# Extra files
diff --git a/libgloss/riscv/nanosleep.c b/libgloss/riscv/nanosleep.c
new file mode 100644
index 0000000..1a24710
--- /dev/null
+++ b/libgloss/riscv/nanosleep.c
@@ -0,0 +1,12 @@
+#include <machine/syscall.h>
+#include <sys/time.h>
+
+int
+nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
+{
+ unsigned long current_time, end_time;
+ asm ("rdtime %0" : "+r" (current_time));
+ end_time = current_time + rqtp->tv_sec * 1000000000ULL + rqtp->tv_nsec;
+ while (current_time <= end_time) asm ("rdtime %0" : "+r" (current_time));
+ return 0;
+}
diff --git a/newlib/configure.host b/newlib/configure.host
index 3e950d8..eb64586 100644
--- a/newlib/configure.host
+++ b/newlib/configure.host
@@ -258,7 +258,7 @@ case "${host_cpu}" in
riscv*)
libm_machine_dir=riscv
machine_dir=riscv
- newlib_cflags="${newlib_cflags}"
+ newlib_cflags="${newlib_cflags} -DHAVE_NANOSLEEP"
default_newlib_atexit_dynamic_alloc="no"
;;
rl78)
--
2.7.4