1 files changed, 41 insertions, 0 deletions
diff --git a/xorg/server/module/amd64/cpuid_amd64.asm b/xorg/server/module/amd64/cpuid_amd64.asm
new file mode 100644
index 00000000..b97937ad
--- /dev/null
+++ b/xorg/server/module/amd64/cpuid_amd64.asm
@@ -0,0 +1,41 @@
+
+SECTION .text
+
+%macro PROC 1
+    align 16
+    global %1
+    %1:
+%endmacro
+
+;The first six integer or pointer arguments are passed in registers
+;RDI, RSI, RDX, RCX, R8, and R9
+
+;int
+;cpuid_amd64(int eax_in, int ecx_in, int *eax, int *ebx, int *ecx, int *edx)
+
+PROC cpuid_amd64
+    ; save registers
+    push rbx
+    
+    push rdx
+    push rcx
+    push r8
+    push r9
+
+    mov rax, rdi
+    mov rcx, rsi
+    cpuid
+    pop rdi
+    mov [rdi], edx
+    pop rdi
+    mov [rdi], ecx
+    pop rdi
+    mov [rdi], ebx
+    pop rdi
+    mov [rdi], eax
+    mov eax, 0
+    ; restore registers
+    pop rbx
+    ret;
+    align 16
+