x86: Support usable check for all CPU features

Support usable check for all CPU features with the following changes:

1. Change struct cpu_features to

struct cpuid_features
{
  struct cpuid_registers cpuid;
  struct cpuid_registers usable;
};

struct cpu_features
{
  struct cpu_features_basic basic;
  struct cpuid_features features[COMMON_CPUID_INDEX_MAX];
  unsigned int preferred[PREFERRED_FEATURE_INDEX_MAX];
...
};

so that there is a usable bit for each cpuid bit.
2. After the cpuid bits have been initialized, copy the known bits to the
usable bits.  EAX/EBX from INDEX_1 and EAX from INDEX_7 aren't used for
CPU feature detection.
3. Clear the usable bits which require OS support.
4. If the feature is supported by OS, copy its cpuid bit to its usable
bit.
5. Replace HAS_CPU_FEATURE and CPU_FEATURES_CPU_P with CPU_FEATURE_USABLE
and CPU_FEATURE_USABLE_P to check if a feature is usable.
6. Add DEPR_FPU_CS_DS for INDEX_7_EBX_13.
7. Unset MPX feature since it has been deprecated.

The results are

1. If the feature is known and doesn't requre OS support, its usable bit
is copied from the cpuid bit.
2. Otherwise, its usable bit is copied from the cpuid bit only if the
feature is known to supported by OS.
3. CPU_FEATURE_USABLE/CPU_FEATURE_USABLE_P are used to check if the
feature can be used.
4. HAS_CPU_FEATURE/CPU_FEATURE_CPU_P are used to check if CPU supports
the feature.

13 files changed, 13 insertions, 13 deletions

diff --git a/sysdeps/i386/fpu/fclrexcpt.c b/sysdeps/i386/fpu/fclrexcpt.c
index 7bf7dd0a8a..7dc357f2d6 100644
--- a/sysdeps/i386/fpu/fclrexcpt.c
+++ b/sysdeps/i386/fpu/fclrexcpt.c
@@ -41,7 +41,7 @@ __feclearexcept (int excepts)
   __asm__ ("fldenv %0" : : "m" (*&temp));
 
   /* If the CPU supports SSE, we clear the MXCSR as well.  */
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     {
       unsigned int xnew_exc;
 
diff --git a/sysdeps/i386/fpu/fedisblxcpt.c b/sysdeps/i386/fpu/fedisblxcpt.c
index 0e518f7f3d..5399bc1f25 100644
--- a/sysdeps/i386/fpu/fedisblxcpt.c
+++ b/sysdeps/i386/fpu/fedisblxcpt.c
@@ -38,7 +38,7 @@ fedisableexcept (int excepts)
   __asm__ ("fldcw %0" : : "m" (*&new_exc));
 
   /* If the CPU supports SSE we set the MXCSR as well.  */
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     {
       unsigned int xnew_exc;
 
diff --git a/sysdeps/i386/fpu/feenablxcpt.c b/sysdeps/i386/fpu/feenablxcpt.c
index b1f70815b1..b9d7e65668 100644
--- a/sysdeps/i386/fpu/feenablxcpt.c
+++ b/sysdeps/i386/fpu/feenablxcpt.c
@@ -38,7 +38,7 @@ feenableexcept (int excepts)
   __asm__ ("fldcw %0" : : "m" (*&new_exc));
 
   /* If the CPU supports SSE we set the MXCSR as well.  */
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     {
       unsigned int xnew_exc;
 
diff --git a/sysdeps/i386/fpu/fegetenv.c b/sysdeps/i386/fpu/fegetenv.c
index cb6ef35ac4..637bc85454 100644
--- a/sysdeps/i386/fpu/fegetenv.c
+++ b/sysdeps/i386/fpu/fegetenv.c
@@ -31,7 +31,7 @@ __fegetenv (fenv_t *envp)
      would block all exceptions.  */
   __asm__ ("fldenv %0" : : "m" (*envp));
 
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     __asm__ ("stmxcsr %0" : "=m" (envp->__eip));
 
   /* Success.  */
diff --git a/sysdeps/i386/fpu/fegetmode.c b/sysdeps/i386/fpu/fegetmode.c
index e14768976c..e5154eab02 100644
--- a/sysdeps/i386/fpu/fegetmode.c
+++ b/sysdeps/i386/fpu/fegetmode.c
@@ -26,7 +26,7 @@ int
 fegetmode (femode_t *modep)
 {
   _FPU_GETCW (modep->__control_word);
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     __asm__ ("stmxcsr %0" : "=m" (modep->__mxcsr));
   return 0;
 }
diff --git a/sysdeps/i386/fpu/feholdexcpt.c b/sysdeps/i386/fpu/feholdexcpt.c
index ad25339b4e..8d2d0ee275 100644
--- a/sysdeps/i386/fpu/feholdexcpt.c
+++ b/sysdeps/i386/fpu/feholdexcpt.c
@@ -30,7 +30,7 @@ __feholdexcept (fenv_t *envp)
   __asm__ volatile ("fnstenv %0; fnclex" : "=m" (*envp));
 
   /* If the CPU supports SSE we set the MXCSR as well.  */
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     {
       unsigned int xwork;
 
diff --git a/sysdeps/i386/fpu/fesetenv.c b/sysdeps/i386/fpu/fesetenv.c
index 5ec7bd6126..cd9afeae28 100644
--- a/sysdeps/i386/fpu/fesetenv.c
+++ b/sysdeps/i386/fpu/fesetenv.c
@@ -79,7 +79,7 @@ __fesetenv (const fenv_t *envp)
 
   __asm__ ("fldenv %0" : : "m" (temp));
 
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     {
       unsigned int mxcsr;
       __asm__ ("stmxcsr %0" : "=m" (mxcsr));
diff --git a/sysdeps/i386/fpu/fesetmode.c b/sysdeps/i386/fpu/fesetmode.c
index 4563da0901..e3b30657b1 100644
--- a/sysdeps/i386/fpu/fesetmode.c
+++ b/sysdeps/i386/fpu/fesetmode.c
@@ -35,7 +35,7 @@ fesetmode (const femode_t *modep)
   else
     cw = modep->__control_word;
   _FPU_SETCW (cw);
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     {
       unsigned int mxcsr;
       __asm__ ("stmxcsr %0" : "=m" (mxcsr));
diff --git a/sysdeps/i386/fpu/fesetround.c b/sysdeps/i386/fpu/fesetround.c
index 18320a646b..5c3fd34cd4 100644
--- a/sysdeps/i386/fpu/fesetround.c
+++ b/sysdeps/i386/fpu/fesetround.c
@@ -37,7 +37,7 @@ __fesetround (int round)
   __asm__ ("fldcw %0" : : "m" (*&cw));
 
   /* If the CPU supports SSE we set the MXCSR as well.  */
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     {
       unsigned int xcw;
 
diff --git a/sysdeps/i386/fpu/feupdateenv.c b/sysdeps/i386/fpu/feupdateenv.c
index 7387831dec..ef7132e4f0 100644
--- a/sysdeps/i386/fpu/feupdateenv.c
+++ b/sysdeps/i386/fpu/feupdateenv.c
@@ -32,7 +32,7 @@ __feupdateenv (const fenv_t *envp)
   __asm__ ("fnstsw %0" : "=m" (*&temp));
 
   /* If the CPU supports SSE we test the MXCSR as well.  */
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     __asm__ ("stmxcsr %0" : "=m" (*&xtemp));
 
   temp = (temp | xtemp) & FE_ALL_EXCEPT;
diff --git a/sysdeps/i386/fpu/fgetexcptflg.c b/sysdeps/i386/fpu/fgetexcptflg.c
index 82b2aa53de..2c32c83636 100644
--- a/sysdeps/i386/fpu/fgetexcptflg.c
+++ b/sysdeps/i386/fpu/fgetexcptflg.c
@@ -34,7 +34,7 @@ __fegetexceptflag (fexcept_t *flagp, int excepts)
   *flagp = temp & excepts & FE_ALL_EXCEPT;
 
   /* If the CPU supports SSE, we clear the MXCSR as well.  */
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     {
       unsigned int sse_exc;
 
diff --git a/sysdeps/i386/fpu/fsetexcptflg.c b/sysdeps/i386/fpu/fsetexcptflg.c
index dc257b8077..02a1bd526d 100644
--- a/sysdeps/i386/fpu/fsetexcptflg.c
+++ b/sysdeps/i386/fpu/fsetexcptflg.c
@@ -41,7 +41,7 @@ __fesetexceptflag (const fexcept_t *flagp, int excepts)
   __asm__ ("fldenv %0" : : "m" (*&temp));
 
   /* If the CPU supports SSE, we set the MXCSR as well.  */
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     {
       unsigned int xnew_exc;
 
diff --git a/sysdeps/i386/fpu/ftestexcept.c b/sysdeps/i386/fpu/ftestexcept.c
index 9c22689ca5..a00c44e6db 100644
--- a/sysdeps/i386/fpu/ftestexcept.c
+++ b/sysdeps/i386/fpu/ftestexcept.c
@@ -32,7 +32,7 @@ fetestexcept (int excepts)
   __asm__ ("fnstsw %0" : "=a" (temp));
 
   /* If the CPU supports SSE we test the MXCSR as well.  */
-  if (HAS_CPU_FEATURE (SSE))
+  if (CPU_FEATURE_USABLE (SSE))
     __asm__ ("stmxcsr %0" : "=m" (*&xtemp));
 
   return (temp | xtemp) & excepts & FE_ALL_EXCEPT;