Adds hello world

cyclecount/cyclecount.c

@@ -1,25 +0,0 @@
-#include <stdio.h>
-
-uint64_t getcycles();
-static void do_something()
-{
-    for (int i = 0; i < 1000; ++i) {
-        __asm__("NOP");
-    }
-}
-
-int main(void)
-{
-    // Instruction cache misses are relatively expensive, so for more
-    // consistent benchmarks that depend less on the relative speed of
-    // the QSPI flash, you might want to fill the instruction cache first.
-    // Note that it can hold 16 KiB of instructions on the HiFive1.
-    do_something();
-    getcycles();
-    uint64_t oldcount = getcycles();
-    do_something();
-    uint64_t newcount = getcycles();
-
-    printf("That took %d cycles.\n", (unsigned int)(newcount-oldcount));
-    return 0;
-}

cyclecount/getcycles.S

@@ -1,10 +0,0 @@
-.text
-
-.globl getcycles
-.align 2
-getcycles:
-    csrr a1, mcycleh
-    csrr a0, mcycle
-    csrr a2, mcycleh
-    bne a1, a2, getcycles
-    ret

helloworld/Makefile

@@ -1,6 +1,6 @@
-TARGET		:= cyclecount.elf
+TARGET		:= helloriscv.elf
-LOCAL_SRC_C	:= cyclecount.c
+LOCAL_SRC_C	:= helloriscv.c
-LOCAL_SRC_S	:= getcycles.S
+LOCAL_SRC_S	:=
 LOCAL_OPT_C	:= -Os -fno-builtin-printf -Wall -Wextra -pedantic
 
 include ../conf/toolchain.mk

helloworld/helloriscv.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(void)
+{
+    printf("Hello RISC-V");
+    return 0;
+}