Simple ELF program loader

Now any initrd file is treated like a program image and passed to the
loader to load as a process. Very rudimentary elf loading just allocates
pages, copies sections, and sets the ELF's entrypoint as the RIP to
iretq to.

src/libraries/kutil/memory.cpp

@@ -17,9 +17,9 @@ memset(void *s, uint8_t v, size_t n)
 }
 
 void *
-memcpy(void *dest, void *src, size_t n)
+memcpy(void *dest, const void *src, size_t n)
 {
-	uint8_t *s = reinterpret_cast<uint8_t *>(src);
+	const uint8_t *s = reinterpret_cast<const uint8_t *>(src);
 	uint8_t *d = reinterpret_cast<uint8_t *>(dest);
 	for (size_t i = 0; i < n; ++i) d[i] = s[i];
 	return d;

src/libraries/kutil/memory.h

@@ -35,7 +35,7 @@ void * memset(void *p, uint8_t v, size_t n);
 /// \src     The memory to copy from
 /// \n       The number of bytes to copy
 /// \returns A pointer to the destination memory
-void * memcpy(void *dest, void *src, size_t n);
+void * memcpy(void *dest, const void *src, size_t n);
 
 /// Read a value of type T from a location in memory
 /// \arg p   The location in memory to read