WIP: VESA driver. Make initfs generated by code

drivers/vesad/src/primitive.rs

@@ -0,0 +1,38 @@
+#[cfg(target_arch = "x86_64")]
+#[allow(unused_assignments)]
+#[inline(always)]
+#[cold]
+pub unsafe fn fast_copy64(dst: *mut u64, src: *const u64, len: usize) {
+    asm!("cld
+        rep movsq"
+        :
+        : "{rdi}"(dst as usize), "{rsi}"(src as usize), "{rcx}"(len)
+        : "cc", "memory"
+        : "intel", "volatile");
+}
+
+#[cfg(target_arch = "x86_64")]
+#[allow(unused_assignments)]
+#[inline(always)]
+#[cold]
+pub unsafe fn fast_set(dst: *mut u32, src: u32, len: usize) {
+    asm!("cld
+        rep stosd"
+        :
+        : "{rdi}"(dst as usize), "{eax}"(src), "{rcx}"(len)
+        : "cc", "memory"
+        : "intel", "volatile");
+}
+
+#[cfg(target_arch = "x86_64")]
+#[allow(unused_assignments)]
+#[inline(always)]
+#[cold]
+pub unsafe fn fast_set64(dst: *mut u64, src: u64, len: usize) {
+    asm!("cld
+        rep stosq"
+        :
+        : "{rdi}"(dst as usize), "{rax}"(src), "{rcx}"(len)
+        : "cc", "memory"
+        : "intel", "volatile");
+}