Architectural Support: x86_64 (#37)

[lunaix-os.git] / lunaix-os / arch / x86 / klib / fast_str.c

diff --git a/lunaix-os/arch/x86/klib/fast_str.c b/lunaix-os/arch/x86/klib/fast_str.c
new file mode 100644 (file)
index 0000000..2704178
--- /dev/null
+++ b/lunaix-os/arch/x86/klib/fast_str.c
@@ -0,0 +1,56 @@
+#include <klibc/string.h>
+
+#ifdef CONFIG_ARCH_X86_64
+void*
+memcpy(void* dest, const void* src, unsigned long num)
+{
+    if (!num)
+        return dest;
+        
+    asm volatile("movq %1, %%rdi\n"
+                 "rep movsb\n" ::"S"(src),
+                 "r"(dest),
+                 "c"(num)
+                 : "rdi", "memory");
+    return dest;
+}
+
+void*
+memset(void* ptr, int value, unsigned long num)
+{
+    asm volatile("movq %1, %%rdi\n"
+                 "rep stosb\n" ::"c"(num),
+                 "r"(ptr),
+                 "a"(value)
+                 : "rdi", "memory");
+    return ptr;
+}
+
+#else
+void*
+memcpy(void* dest, const void* src, unsigned long num)
+{
+    if (!num)
+        return dest;
+        
+    asm volatile("movl %1, %%edi\n"
+                 "rep movsb\n" ::"S"(src),
+                 "r"(dest),
+                 "c"(num)
+                 : "edi", "memory");
+    return dest;
+}
+
+void*
+memset(void* ptr, int value, unsigned long num)
+{
+    asm volatile("movl %1, %%edi\n"
+                 "rep stosb\n" ::"c"(num),
+                 "r"(ptr),
+                 "a"(value)
+                 : "edi", "memory");
+    return ptr;
+}
+
+#endif
+