x86: Add PTWRITE feature detection [BZ #27346]

1. Add CPUID_INDEX_14_ECX_0 for CPUID leaf 0x14 to detect PTWRITE feature
in EBX of CPUID leaf 0x14 with ECX == 0.
2. Add PTWRITE detection to CPU feature tests.
3. Add 2 static CPU feature tests.

diff --git a/manual/platform.texi b/manual/platform.texi
index 6caf68d796956d7986190f41afb1e8114f2535d4..a0b204b099ce4894db82c4ae44dbc5e521d10e52 100644 (file)
--- a/manual/platform.texi
+++ b/manual/platform.texi
@@ -487,6 +487,9 @@ extended state management using XSAVE/XRSTOR.
 @item
 @code{PSN} -- Processor Serial Number.
 
+@item
+@code{PTWRITE} -- PTWRITE instruction.
+
 @item
 @code{RDPID} -- RDPID instruction.
 

diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
index dd826743426ffc9c9bc3756f2c703724f0a454a6..e1f9379fd8a63e668f80b19db46d0b0d104aee83 100644 (file)
--- a/sysdeps/x86/Makefile
+++ b/sysdeps/x86/Makefile
@@ -8,8 +8,11 @@ sysdep-dl-routines += dl-get-cpu-features
 sysdep_headers += sys/platform/x86.h
 
 tests += tst-get-cpu-features tst-get-cpu-features-static \
-        tst-cpu-features-cpuinfo tst-cpu-features-supports
-tests-static += tst-get-cpu-features-static
+        tst-cpu-features-cpuinfo tst-cpu-features-cpuinfo-static \
+        tst-cpu-features-supports tst-cpu-features-supports-static
+tests-static += tst-get-cpu-features-static \
+               tst-cpu-features-cpuinfo-static \
+               tst-cpu-features-supports-static
 ifeq (yes,$(have-ifunc))
 tests += \
   tst-ifunc-isa-1 \

diff --git a/sysdeps/x86/bits/platform/x86.h b/sysdeps/x86/bits/platform/x86.h
index 8f423ae721dc074e31100c753d7357ef7bb73e13..c4850fc3cbe4c2ac1a6871e7d94f59d84cc6f90e 100644 (file)
--- a/sysdeps/x86/bits/platform/x86.h
+++ b/sysdeps/x86/bits/platform/x86.h
@@ -29,7 +29,8 @@ enum
   CPUID_INDEX_80000007,
   CPUID_INDEX_80000008,
   CPUID_INDEX_7_ECX_1,
-  CPUID_INDEX_19
+  CPUID_INDEX_19,
+  CPUID_INDEX_14_ECX_0
 };
 
 struct cpuid_feature
@@ -295,5 +296,11 @@ enum
        + cpuid_register_index_ebx * 8 * sizeof (unsigned int)),
 
   x86_cpu_AESKLE               = x86_cpu_index_19_ebx,
-  x86_cpu_WIDE_KL              = x86_cpu_index_19_ebx + 2
+  x86_cpu_WIDE_KL              = x86_cpu_index_19_ebx + 2,
+
+  x86_cpu_index_14_ecx_0_ebx
+    = (CPUID_INDEX_14_ECX_0 * 8 * 4 * sizeof (unsigned int)
+       + cpuid_register_index_ebx * 8 * sizeof (unsigned int)),
+
+  x86_cpu_PTWRITE              = x86_cpu_index_14_ecx_0_ebx + 4
 };

diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 7996ed0cd2d4aa2379a7f73b673b5fad5b285cbc..d7248cbb4545b3ac056bc7aa7491bb2958f10e22 100644 (file)
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -97,6 +97,7 @@ update_usable (struct cpu_features *cpu_features)
   CPU_FEATURE_SET_USABLE (cpu_features, FZLRM);
   CPU_FEATURE_SET_USABLE (cpu_features, FSRS);
   CPU_FEATURE_SET_USABLE (cpu_features, FSRCS);
+  CPU_FEATURE_SET_USABLE (cpu_features, PTWRITE);
 
   /* Can we call xgetbv?  */
   if (CPU_FEATURES_CPU_P (cpu_features, OSXSAVE))
@@ -359,6 +360,13 @@ get_common_indices (struct cpu_features *cpu_features,
                   cpu_features->features[CPUID_INDEX_D_ECX_1].cpuid.ecx,
                   cpu_features->features[CPUID_INDEX_D_ECX_1].cpuid.edx);
 
+  if (cpu_features->basic.max_cpuid >= 0x14)
+    __cpuid_count (0x14, 0,
+                  cpu_features->features[CPUID_INDEX_14_ECX_0].cpuid.eax,
+                  cpu_features->features[CPUID_INDEX_14_ECX_0].cpuid.ebx,
+                  cpu_features->features[CPUID_INDEX_14_ECX_0].cpuid.ecx,
+                  cpu_features->features[CPUID_INDEX_14_ECX_0].cpuid.edx);
+
   if (cpu_features->basic.max_cpuid >= 0x19)
     __cpuid_count (0x19, 0,
                   cpu_features->features[CPUID_INDEX_19].cpuid.eax,

diff --git a/sysdeps/x86/include/cpu-features.h b/sysdeps/x86/include/cpu-features.h
index 475e87729472574f7339cab840f5b8eeb8fe48f3..dabe6b9d86bcf7cfb950d3b4b93eb09ecdd7dc09 100644 (file)
--- a/sysdeps/x86/include/cpu-features.h
+++ b/sysdeps/x86/include/cpu-features.h
@@ -29,7 +29,7 @@
 
 enum
 {
-  CPUID_INDEX_MAX = CPUID_INDEX_19 + 1
+  CPUID_INDEX_MAX = CPUID_INDEX_14_ECX_0 + 1
 };
 
 enum
@@ -307,6 +307,11 @@ enum
 #define bit_cpu_AESKLE         (1u << 0)
 #define bit_cpu_WIDE_KL                (1u << 2)
 
+/* CPUID_INDEX_14_ECX_0.  */
+
+/* EBX.  */
+#define bit_cpu_PTWRITE                (1u << 4)
+
 /* CPUID_INDEX_1.  */
 
 /* ECX.  */
@@ -532,6 +537,11 @@ enum
 #define index_cpu_AESKLE       CPUID_INDEX_19
 #define index_cpu_WIDE_KL      CPUID_INDEX_19
 
+/* CPUID_INDEX_14_ECX_0.  */
+
+/* EBX.  */
+#define index_cpu_PTWRITE      CPUID_INDEX_14_ECX_0
+
 /* CPUID_INDEX_1.  */
 
 /* ECX.  */
@@ -757,6 +767,11 @@ enum
 #define reg_AESKLE             ebx
 #define reg_WIDE_KL            ebx
 
+/* CPUID_INDEX_14_ECX_0.  */
+
+/* EBX.  */
+#define reg_PTWRITE            ebx
+
 /* PREFERRED_FEATURE_INDEX_1.  */
 #define bit_arch_I586                          (1u << 0)
 #define bit_arch_I686                          (1u << 1)

diff --git a/sysdeps/x86/tst-cpu-features-cpuinfo-static.c b/sysdeps/x86/tst-cpu-features-cpuinfo-static.c
new file mode 100644 (file)
index 0000000..993a1a9
--- /dev/null
+++ b/sysdeps/x86/tst-cpu-features-cpuinfo-static.c
@@ -0,0 +1 @@
+#include "tst-cpu-features-cpuinfo.c"

diff --git a/sysdeps/x86/tst-cpu-features-cpuinfo.c b/sysdeps/x86/tst-cpu-features-cpuinfo.c
index 3c2fa7d9b6a105012a14f21863e6b55af0b29039..75e7eb9352b01f470e951e7ef8c3bfa8b01f063e 100644 (file)
--- a/sysdeps/x86/tst-cpu-features-cpuinfo.c
+++ b/sysdeps/x86/tst-cpu-features-cpuinfo.c
@@ -199,6 +199,7 @@ do_test (int argc, char **argv)
   fails += CHECK_PROC (popcnt, POPCNT);
   fails += CHECK_PROC (3dnowprefetch, PREFETCHW);
   fails += CHECK_PROC (prefetchwt1, PREFETCHWT1);
+  fails += CHECK_PROC (ptwrite, PTWRITE);
   fails += CHECK_PROC (pse, PSE);
   fails += CHECK_PROC (pse36, PSE_36);
   fails += CHECK_PROC (psn, PSN);

diff --git a/sysdeps/x86/tst-cpu-features-supports-static.c b/sysdeps/x86/tst-cpu-features-supports-static.c
new file mode 100644 (file)
index 0000000..38f4046
--- /dev/null
+++ b/sysdeps/x86/tst-cpu-features-supports-static.c
@@ -0,0 +1 @@
+#include "tst-cpu-features-supports.c"

diff --git a/sysdeps/x86/tst-cpu-features-supports.c b/sysdeps/x86/tst-cpu-features-supports.c
index 79d803eb291c188af8e9afe7dbee70cf69628490..ce78a7d8bcce75a486c16443cf9b9d1fd5d8fe73 100644 (file)
--- a/sysdeps/x86/tst-cpu-features-supports.c
+++ b/sysdeps/x86/tst-cpu-features-supports.c
@@ -149,6 +149,7 @@ do_test (int argc, char **argv)
   fails += CHECK_SUPPORTS (popcnt, POPCNT);
 #if __GNUC_PREREQ (11, 0)
   fails += CHECK_SUPPORTS (prefetchwt1, PREFETCHWT1);
+  fails += CHECK_SUPPORTS (ptwrite, PTWRITE);
   fails += CHECK_SUPPORTS (rdpid, RDPID);
   fails += CHECK_SUPPORTS (rdrnd, RDRAND);
   fails += CHECK_SUPPORTS (rdseed, RDSEED);

diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c
index b5e7f6e7b03c0761619148468d69964a557d031b..583e1e6d4994b7ba3179e1126931070ff24f6421 100644 (file)
--- a/sysdeps/x86/tst-get-cpu-features.c
+++ b/sysdeps/x86/tst-get-cpu-features.c
@@ -203,6 +203,7 @@ do_test (void)
   CHECK_CPU_FEATURE (LAM);
   CHECK_CPU_FEATURE (AESKLE);
   CHECK_CPU_FEATURE (WIDE_KL);
+  CHECK_CPU_FEATURE (PTWRITE);
 
   printf ("Usable CPU features:\n");
   CHECK_CPU_FEATURE_USABLE (SSE3);
@@ -364,6 +365,7 @@ do_test (void)
   CHECK_CPU_FEATURE_USABLE (FSRCS);
   CHECK_CPU_FEATURE_USABLE (AESKLE);
   CHECK_CPU_FEATURE_USABLE (WIDE_KL);
+  CHECK_CPU_FEATURE_USABLE (PTWRITE);
 
   return 0;
 }