ar100: Support for ar100 (#6054)

Add files to support AR100

Signed-off-by: Elias Bakken <elias@iagent.no>

src/ar100/util.c

@@ -0,0 +1,34 @@
+// Helper functions for ar100
+//
+// Copyright (C) 2020-2021  Elias Bakken <elias@iagent.no>
+//
+// This file may be distributed under the terms of the GNU GPLv3 license.
+
+#include "util.h"
+
+void *memcpy(void *restrict dest, const void *restrict src, size_t n){
+   // Typecast src and dest addresses to (char *)
+   char *csrc = (char *)src;
+   char *cdest = (char *)dest;
+
+   // Copy contents of src[] to dest[]
+   for (int i=0; i<n; i++)
+       cdest[i] = csrc[i];
+   return dest;
+}
+
+void *memset(void *dest, int c, size_t n){
+  unsigned char *s = dest;
+  for(; n; n--){
+    *s++ = c;
+  }
+  return dest;
+}
+
+void set_bit(uint32_t addr, uint8_t bit){
+  write_reg(addr, read_reg(addr) | (1<<bit));
+}
+
+void clear_bit(uint32_t addr, uint8_t bit){
+  write_reg(addr, read_reg(addr) & ~(1<<bit));
+}