[pulseaudio-discuss] [PATCH 1/3] core: Distinguish Cortex processors: A8 vs later (A9, A15)

[Peter Meerwald]

From: Peter Meerwald <p.meerwald at bct-electronic.com>

Signed-off-by: Peter Meerwald <p.meerwald at bct-electronic.com>
---
 src/pulsecore/cpu-arm.c |   20 ++++++++++++++------
 src/pulsecore/cpu-arm.h |    3 ++-
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/src/pulsecore/cpu-arm.c b/src/pulsecore/cpu-arm.c
index cce3b91..32f0e53 100644
--- a/src/pulsecore/cpu-arm.c
+++ b/src/pulsecore/cpu-arm.c
@@ -80,10 +80,9 @@ static char *get_cpuinfo(void) {
 #endif /* defined (__arm__) && defined (__linux__) */
 
 void pa_cpu_get_arm_flags(pa_cpu_arm_flag_t *flags) {
-#if defined (__arm__)
-#if defined (__linux__)
+#if defined (__arm__) && defined (__linux__)
     char *cpuinfo, *line;
-    int arch;
+    int arch, part;
 
     /* We need to read the CPU flags from /proc/cpuinfo because there is no user
      * space support to get the CPU features. This only works on linux AFAIK. */
@@ -104,6 +103,7 @@ void pa_cpu_get_arm_flags(pa_cpu_arm_flag_t *flags) {
 
         pa_xfree(line);
     }
+
     /* get the CPU features */
     if ((line = get_cpuinfo_line(cpuinfo, "Features"))) {
         const char *state = NULL;
@@ -122,16 +122,24 @@ void pa_cpu_get_arm_flags(pa_cpu_arm_flag_t *flags) {
             pa_xfree(current);
         }
     }
+
+    /* get the CPU part number */
+    if ((line = get_cpuinfo_line(cpuinfo, "CPU part"))) {
+        part = strtoul(line, NULL, 0);
+        if (part == 0xc08)
+            *flags |= PA_CPU_ARM_CORTEX_A8;
+        pa_xfree(line);
+    }
     pa_xfree(cpuinfo);
 
-    pa_log_info("CPU flags: %s%s%s%s%s%s",
+    pa_log_info("CPU flags: %s%s%s%s%s%s%s",
           (*flags & PA_CPU_ARM_V6) ? "V6 " : "",
           (*flags & PA_CPU_ARM_V7) ? "V7 " : "",
           (*flags & PA_CPU_ARM_VFP) ? "VFP " : "",
           (*flags & PA_CPU_ARM_EDSP) ? "EDSP " : "",
           (*flags & PA_CPU_ARM_NEON) ? "NEON " : "",
-          (*flags & PA_CPU_ARM_VFPV3) ? "VFPV3 " : "");
-#endif
+          (*flags & PA_CPU_ARM_VFPV3) ? "VFPV3 " : "",
+          (*flags & PA_CPU_ARM_CORTEX_A8) ? "Cortex-A8 " : "");
 #endif
 }
 
diff --git a/src/pulsecore/cpu-arm.h b/src/pulsecore/cpu-arm.h
index 5bc7d3b..51f7395 100644
--- a/src/pulsecore/cpu-arm.h
+++ b/src/pulsecore/cpu-arm.h
@@ -36,7 +36,8 @@ typedef enum pa_cpu_arm_flag {
     PA_CPU_ARM_VFP      = (1 << 2),
     PA_CPU_ARM_EDSP     = (1 << 3),
     PA_CPU_ARM_NEON     = (1 << 4),
-    PA_CPU_ARM_VFPV3    = (1 << 5)
+    PA_CPU_ARM_VFPV3    = (1 << 5),
+    PA_CPU_ARM_CORTEX_A8 = (1 << 6),
 } pa_cpu_arm_flag_t;
 
 void pa_cpu_get_arm_flags(pa_cpu_arm_flag_t *flags);
-- 
1.7.9.5