Bug 1835591 - Part 1. Add the detection of ARM crypto extension for arm 32bit. r=glandium

Differential Revision: https://phabricator.services.mozilla.com/D180646

mozglue/build/arm.cpp

@@ -22,7 +22,8 @@ enum {
   MOZILLA_HAS_EDSP_FLAG = 1,
   MOZILLA_HAS_ARMV6_FLAG = 2,
   MOZILLA_HAS_ARMV7_FLAG = 4,
-  MOZILLA_HAS_NEON_FLAG = 8
+  MOZILLA_HAS_NEON_FLAG = 8,
+  MOZILLA_HAS_AES_FLAG = 16
 };
 
 static unsigned get_arm_cpu_flags(void) {
@@ -49,6 +50,10 @@ static unsigned get_arm_cpu_flags(void) {
         p = strstr(buf, " neon");
         if (p != nullptr && (p[5] == ' ' || p[5] == '\n'))
           flags |= MOZILLA_HAS_NEON_FLAG;
+        p = strstr(buf, " aes");
+        if (p != nullptr && (p[4] == ' ' || p[4] == '\n')) {
+          flags |= MOZILLA_HAS_AES_FLAG;
+        }
       }
       if (memcmp(buf, "CPU architecture:", 17) == 0) {
         int version;
@@ -109,6 +114,12 @@ static bool check_neon(void) {
 }
 #    endif
 
+#    if !defined(MOZILLA_PRESUME_ARM_AES)
+static bool check_aes(void) {
+  return (arm_cpu_flags & MOZILLA_HAS_AES_FLAG) != 0;
+}
+#    endif
+
 #  endif  // defined(__linux__) || defined(ANDROID)
 
 namespace mozilla {
@@ -125,6 +136,9 @@ bool armv7_enabled = check_armv7();
 #  if !defined(MOZILLA_PRESUME_NEON)
 bool neon_enabled = check_neon();
 #  endif
+#  if !defined(MOZILLA_PRESUME_ARM_AES)
+bool aes_enabled = check_aes();
+#  endif
 }  // namespace arm_private
 }  // namespace mozilla
 

mozglue/build/arm.h

@@ -81,6 +81,10 @@
 #  define MOZILLA_PRESUME_NEON 1
 #endif
 
+#if defined(__ARM_FEATURE_CRYPTO)
+#  define MOZILLA_PRESUME_ARM_AES 1
+#endif
+
 namespace mozilla {
 
 namespace arm_private {
@@ -97,6 +101,9 @@ extern bool MFBT_DATA armv7_enabled;
 #  if !defined(MOZILLA_PRESUME_NEON)
 extern bool MFBT_DATA neon_enabled;
 #  endif
+#  if !defined(MOZILLA_PRESUME_ARM_AES)
+extern bool MFBT_DATA aes_enabled;
+#  endif
 #endif
 }  // namespace arm_private
 
@@ -139,6 +146,13 @@ inline bool supports_neon() { return arm_private::neon_enabled; }
 #else
 inline bool supports_neon() { return false; }
 #endif
+#if defined(MOZILLA_PRESUME_ARM_AES)
+inline bool supports_arm_aes() { return true; }
+#elif defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
+inline bool supports_arm_aes() { return arm_private::aes_enabled; }
+#else
+inline bool supports_arm_aes() { return false; }
+#endif
 
 }  // namespace mozilla