cpuid: cache processor brand string

Signed-off-by: Ahmed Samy <f.fallen45@gmail.com>

diff --git a/ccan/cpuid/cpuid.c b/ccan/cpuid/cpuid.c
index 55a089213797f2e24527b69c46d1315f1fc784ad..1a09c5e666cb9457041bb0ae524fdd579677c07d 100644 (file)
--- a/ccan/cpuid/cpuid.c
+++ b/ccan/cpuid/cpuid.c
@@ -248,9 +248,16 @@ void cpuid(cpuid_t info, uint32_t *buf)
                return;
 
        if (info == CPU_PROC_BRAND_STRING) {
-               ___cpuid(CPU_PROC_BRAND_STRING,           &buf[0], &buf[1], &buf[2],  &buf[3]);
-               ___cpuid(CPU_PROC_BRAND_STRING_INTERNAL0, &buf[4], &buf[5], &buf[6],  &buf[7]);
-               ___cpuid(CPU_PROC_BRAND_STRING_INTERNAL1, &buf[8], &buf[9], &buf[10], &buf[11]);
+               static char cached[48] = { 0 };
+               if (cached[0] == '\0') {
+                       ___cpuid(CPU_PROC_BRAND_STRING,           &buf[0], &buf[1], &buf[2],  &buf[3]);
+                       ___cpuid(CPU_PROC_BRAND_STRING_INTERNAL0, &buf[4], &buf[5], &buf[6],  &buf[7]);
+                       ___cpuid(CPU_PROC_BRAND_STRING_INTERNAL1, &buf[8], &buf[9], &buf[10], &buf[11]);
+
+                       memcpy(cached, buf, sizeof cached);
+               } else
+                       buf = (uint32_t *)cached;
+
                return;
        } else if (info == CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) {
                *buf = cpuid_highest_ext_func_supported();