[PATCH v7] eal/ppc: fix compilation for musl

[Duncan Bellamy <dunk@denkimushi.com>]

musl lacks __ppc_get_timebase() but has __builtin_ppc_get_timebase()

Signed-off-by: Duncan Bellamy <dunk@denkimushi.com>
---
 lib/eal/ppc/include/rte_cycles.h |  7 ++++++
 lib/eal/ppc/rte_cycles.c         | 39 ++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/lib/eal/ppc/include/rte_cycles.h b/lib/eal/ppc/include/rte_cycles.h
index 5585f9273c..666fc9b0bf 100644
--- a/lib/eal/ppc/include/rte_cycles.h
+++ b/lib/eal/ppc/include/rte_cycles.h
@@ -10,7 +10,10 @@
 extern "C" {
 #endif
 
+#include <features.h>
+#ifdef __GLIBC__
 #include <sys/platform/ppc.h>
+#endif
 
 #include "generic/rte_cycles.h"
 
@@ -26,7 +29,11 @@ extern "C" {
 static inline uint64_t
 rte_rdtsc(void)
 {
+#ifdef __GLIBC__
 	return __ppc_get_timebase();
+#else
+	return __builtin_ppc_get_timebase();
+#endif
 }
 
 static inline uint64_t
diff --git a/lib/eal/ppc/rte_cycles.c b/lib/eal/ppc/rte_cycles.c
index 3180adb0ff..cd4bdff8b8 100644
--- a/lib/eal/ppc/rte_cycles.c
+++ b/lib/eal/ppc/rte_cycles.c
@@ -2,12 +2,51 @@
  * Copyright (C) IBM Corporation 2019.
  */
 
+#include <features.h>
+#ifdef __GLIBC__
 #include <sys/platform/ppc.h>
+#elif RTE_EXEC_ENV_LINUX
+#include <string.h>
+#include <stdio.h>
+#endif
 
 #include "eal_private.h"
 
 uint64_t
 get_tsc_freq_arch(void)
 {
+#ifdef __GLIBC__
 	return __ppc_get_timebase_freq();
+#elif RTE_EXEC_ENV_LINUX
+	static unsigned long base;
+	char buf[512];
+	ssize_t nr;
+	FILE *f;
+
+	if (base != 0)
+		goto out;
+
+	f = fopen("/proc/cpuinfo", "rb");
+	if (f == NULL)
+		goto out;
+
+	while (fgets(buf, sizeof(buf), f) != NULL) {
+		char *ret = strstr(buf, "timebase");
+
+		if (ret == NULL)
+			continue;
+		ret += sizeof("timebase") - 1;
+		ret = strchr(ret, ':');
+		if (ret == NULL)
+			continue;
+		base = strtoul(ret + 1, NULL, 10);
+		break;
+	}
+	fclose(f);
+out:
+	return (uint64_t) base;
+#else
+	return 0;
+#endif
+
 }
-- 
2.34.1