builders: fix xs RTL running nanosleep

Author: xieby1

builders/cptBuilder/qemu/default.nix

@@ -60,6 +60,8 @@ stdenv.mkDerivation {
   '' /* fix bug that not taking 0th checkpoint */ + ''
     sed -i '/if (first_insns_item->data == 0) {/,/^        }$/d' target/riscv/multicore.c
     sed -i 's/limit_instructions==0/\&ns->sync_info.online_cpus==0/' target/riscv/serializer.c
+  '' /* fix: sstc is disabled in nemu machine if not provide_rdtime*/ + ''
+    sed -i 's/RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, false/RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, true/' hw/riscv/nemu.c
   '';
 
   buildInputs = [

builders/default.nix

@@ -125,6 +125,7 @@ cores ? "1"
 , linuxKernelPatches ? [
     (import ./imgBuilder/linux/patches/enable-clint.nix)
     (import ./imgBuilder/linux/patches/panic_shutdown.nix)
+    (import ./imgBuilder/linux/patches/relaxing_random_entropy.nix)
   ]
 
 , ...

builders/imgBuilder/linux/patches/relaxing_random_entropy.nix

@@ -0,0 +1,16 @@
+rec {
+  name = "relaxing-random-entropy";
+  patch = builtins.toFile name ''
+    --- a/drivers/char/random.c
+    +++ b/drivers/char/random.c
+    @@ -1280,8 +1280,6 @@
+     		last = stack->entropy;
+     	}
+     	stack->samples_per_bit = DIV_ROUND_UP(NUM_TRIAL_SAMPLES, num_different + 1);
+    -	if (stack->samples_per_bit > MAX_SAMPLES_PER_BIT)
+    -		return;
+     
+     	atomic_set(&stack->samples, 0);
+     	timer_setup_on_stack(&stack->timer, entropy_timer, 0);
+  '';
+}