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diff --git a/libpcsxcore/new_dynarec/assem_x64.h b/libpcsxcore/new_dynarec/assem_x64.h
new file mode 100644
index 00000000..9c114f51
--- /dev/null
+++ b/libpcsxcore/new_dynarec/assem_x64.h
@@ -0,0 +1,24 @@
+#define HOST_REGS 8
+#define HOST_CCREG 6
+#define HOST_BTREG 5
+#define EXCLUDE_REG 4
+
+//#define IMM_PREFETCH 1
+#define HOST_IMM_ADDR32 1
+#define INVERTED_CARRY 1
+#define DESTRUCTIVE_WRITEBACK 1
+#define DESTRUCTIVE_SHIFT 1
+
+#define USE_MINI_HT 1
+
+#define BASE_ADDR 0x70000000 // Code generator target address
+#define TARGET_SIZE_2 25 // 2^25 = 32 megabytes
+
+#define ROM_COPY ((void *)0x78000000) // For Goldeneye hack
+
+/* x86-64 calling convention:
+   func(rdi, rsi, rdx, rcx, r8, r9) {return rax;}
+   callee-save: %rbp %rbx %r12-%r15 */
+
+#define ARG1_REG 7 /* RDI */
+#define ARG2_REG 6 /* RSI */