add directory Linux-0.98

Linux-0.98/Yggdrasil-0.98.3/usr/include/asm/memory.h

@@ -0,0 +1,39 @@
+/*
+ *  NOTE!!! memcpy(dest,src,n) assumes ds=es=normal data segment. This
+ *  goes for all kernel functions (ds=es=kernel space, fs=local data,
+ *  gs=null), as well as for all well-behaving user programs (ds=es=
+ *  user data space). This is NOT a bug, as any user program that changes
+ *  es deserves to die if it isn't careful.
+ */
+#if 0
+#define memcpy(dest,src,n) ({ \
+void * _res = dest; \
+__asm__ __volatile__ ("cld;rep;movsb" \
+	::"D" ((long)(_res)),"S" ((long)(src)),"c" ((long) (n)) \
+	:"di","si","cx"); \
+_res; \
+})
+#else
+
+/* this is basically memcpy_tofs.  It should be faster.
+   I've reorder it.  This should be a little faster. -RAB */
+
+#define memcpy(dest, src, n) f_memcpy(dest, src, n)
+extern inline void * f_memcpy(void * to, void * from, unsigned long n)
+{
+__asm__("cld\n\t"
+	"movl %%edx, %%ecx\n\t"
+	"shrl $2,%%ecx\n\t"
+	"rep ; movsl\n\t"
+	"testb $1,%%dl\n\t"
+	"je 1f\n\t"
+	"movsb\n"
+	"1:\ttestb $2,%%dl\n\t"
+	"je 2f\n\t"
+	"movsw\n"
+	"2:\n"
+	::"d" (n),"D" ((long) to),"S" ((long) from)
+	: "cx","di","si");
+return (to);
+}
+#endif