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* [newlib-cygwin] RISC-V: Add nanosleep functionality
@ 2017-12-26 20:26 Jim Wilson
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From: Jim Wilson @ 2017-12-26 20:26 UTC (permalink / raw)
To: newlib-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=a6633677b9152d02164a51ae9ba79cef9230e1d3
commit a6633677b9152d02164a51ae9ba79cef9230e1d3
Author: Jim Wilson <jimw@sifive.com>
Date: Tue Dec 26 12:24:45 2017 -0800
RISC-V: Add nanosleep functionality
Diff:
---
libgloss/riscv/Makefile.in | 1 +
libgloss/riscv/nanosleep.c | 12 ++++++++++++
newlib/configure.host | 2 +-
3 files changed, 14 insertions(+), 1 deletion(-)
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)
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