Merge branch 'cache' into 'rv64'

Cache

See merge request projectn/nexus-am!15

tests/cachetest/tests/access-cache.c

-#include "klib.h"
-
-int main() {
-  int round = 30;
-  static char arr[4 * 1024 * 1024];
-  for (int i = 0; i < round; i++)
-    arr[i * 64] = i;
-  for (int i = 0; i < round; i++)
-    assert(arr[i * 64] == (char)i);
-  return 0;
-}

tests/cachetest/tests/access.c

 #include "klib.h"
 
-int ans[64] = {0};
+#define N 64
+#define CACHE_SIZE (32 * 1024)
+int ans[2 * CACHE_SIZE / sizeof(int)] = {0};
 
 int main() {
   int i = 0;
-  for (i = 0; i < 64; i++)
-    ans[i] = 64 - i;
-  for (i = 0; i < 64; i++)
-    assert(ans[i] == 64 - i);
+  for (i = 0; i < N; i++)
+    ans[i] = i;
+
+  int start = CACHE_SIZE / sizeof(int);
+  for (i = 0; i < N; i++)
+    ans[start + i] = start + i;
+
+  for (i = 0; i < N; i++) {
+    assert(ans[i] == i);
+    assert(ans[start + i] == start + i);
+  }
   return 0;
 }