From 5fa52ef19fb63fc3ec5e268f580c87064db331b8 Mon Sep 17 00:00:00 2001
From: Olof-Joachim Frahm <olof@macrolet.net>
Date: Thu, 7 Nov 2013 01:21:13 +0100
Subject: [PATCH] Preliminary parsing of CPUID information.

Including processor name and feature flags.
---
 src/code/x86-cpuid.lisp |   86 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/code/x86-cpuid.lisp

diff --git a/src/code/x86-cpuid.lisp b/src/code/x86-cpuid.lisp
new file mode 100644
index 0000000..f9d37f0
--- /dev/null
+++ b/src/code/x86-cpuid.lisp
@@ -0,0 +1,86 @@
+;;;; CPUID handling for X86-based systems
+
+(in-package "SB!VM")
+
+(defun u32-to-string (&rest rest)
+  (loop
+    with length = (length rest)
+    with result = (make-string (* 4 length))
+    for i from 0 by 4
+    for u32 in rest
+    do (loop
+         for j from 0 below 4
+         do (setf (char result (+ i j)) (code-char (ldb (byte 8 (* j 8)) u32))))
+    finally (return result)))
+
+(defparameter *cpuid-vendor-ids*
+  '(("AMDisbetter!" :oldamd)
+    ("AuthenticAMD" :amd)
+    ("GenuineIntel" :intel)
+    ("CentaurHauls" :via)
+    ("TransmetaCPU" :oldtransmeta)
+    ("GenuineTMx86" :transmeta)
+    ("CyrixInstead" :cyrix)
+    ("CentaurHauls" :centaur)
+    ("NexGenDriven" :nexgen)
+    ("UMC UMC UMC " :umc)
+    ("SiS SiS SiS " :sis)
+    ("Geode by NSC" :nsc)
+    ("RiseRiseRise" :rise)))
+
+(defun cpuid-vendor-id ()
+  (multiple-value-bind (eax ebx ecx edx)
+      (%cpuid/4 0 0 0 0)
+    (let ((decoded (u32-to-string ebx edx ecx)))
+      (values eax (cadr (assoc decoded *cpuid-vendor-ids* :test #'string=)) decoded))))
+
+(defparameter *cpuid-feature-flags*
+  '((:sse3 :pclmul :dtes64 :mon
+     :dspcl :vmx :smx :est
+     :tm2 :ssse3 :cid NIL
+     :fma :cx16 :etprd :pdcm
+     NIL :pcid :dca :sse4.1
+     sse4.2 :x2apic :movbe :popcnt
+     :tscd :aes :xsave :osxsave
+     :avx :f16c :rdrand NIL)
+    (:fpu :vme :de :pse
+     :tsc :msr :pae :mce
+     :cx8 :apic NIL :sep
+     :mtrr :pge :mca :cmov
+     :pat :pse36 :psn :clfl
+     NIL :dtes :acpi :mmx
+     :fxsr :sse :sse2 :ss
+     :htt :tm1 :ia-64 :pbe)))
+
+(defun decode-cpuid-feature-flags (value flags)
+  (let (result (i 0))
+    (dolist (flag flags result)
+      (when (and flag (logbitp i value))
+        (push flag result))
+      (incf i))))
+
+(defun cpuid-signature ()
+  (multiple-value-bind (eax ebx ecx edx)
+      (%cpuid/4 1 0 0 0)
+    (let (flags)
+      (values
+       ;; (ldb (byte 4 0) eax) ; stepping
+       ;; (ldb (byte 4 4) eax) ; model
+       ;; (ldb (byte 4 8) eax) ; family
+       (append (decode-cpuid-feature-flags ecx (car *cpuid-feature-flags*))
+               (decode-cpuid-feature-flags edx (cadr *cpuid-feature-flags*)))
+       flags))))
+
+(defun cpuid-processor-name ()
+  (string-trim '(#\Space #\0)
+   (concatenate
+    'string
+    (multiple-value-call #'u32-to-string (%cpuid/4 #x80000002 0 0 0))
+    (multiple-value-call #'u32-to-string (%cpuid/4 #x80000003 0 0 0))
+    (multiple-value-call #'u32-to-string (%cpuid/4 #x80000004 0 0 0)))))
+
+(defun cpuid (what)
+  (ecase what
+   (:vendor-id (cpuid-vendor-id))
+   (:signature (cpuid-signature))
+   (:processor-name (cpuid-processor-name))))
-- 
1.7.10.4