Update Botan to new release

Author: fwsGonzo

cmake/botan.cmake

@@ -4,14 +4,14 @@
 include(ExternalProject)
 
 if(${ARCH} STREQUAL "x86_64")
-  set(BOTAN_HASH 7432fa529d86070317f594dddb07944f)
+  set(BOTAN_HASH fb698d0f5c9497b7029c9573888c22c8)
 elseif(${ARCH} STREQUAL "i686")
-  set(BOTAN_HASH 5ef7f26047f8fe17219f62755938621d)
+  set(BOTAN_HASH c22686843461d58a5ac15da7fab18e21)
 endif()
 
 ExternalProject_Add(botan
         PREFIX botan
-        URL https://github.com/includeos/botan/releases/download/inc-2.0/botan-includeos-${ARCH}.tar.gz
+        URL https://github.com/fwsgonzo/botan/releases/download/v0.11/botan-includeos-${ARCH}.tar.gz
         URL_HASH MD5=${BOTAN_HASH}
         CONFIGURE_COMMAND ""
         BUILD_COMMAND ""

src/kernel/os.cpp

@@ -251,12 +251,12 @@ void OS::halt() {
 #warning "OS::halt() not implemented for selected arch"
 #endif
   // Count sleep cycles
-  *os_cycles_hlt += cycles_since_boot() - *os_cycles_total;
+  if (os_cycles_hlt)
+      *os_cycles_hlt += cycles_since_boot() - *os_cycles_total;
 }
 
 void OS::event_loop()
 {
-
   IRQ_manager::get().process_interrupts();
   do {
     OS::halt();