From dc0efb480067db854d27ef439c1fb598769ba361 Mon Sep 17 00:00:00 2001
From: Mike Cailean <mcailean@codeaurora.org>
Date: Thu, 13 Dec 2018 10:08:18 -0800
Subject: [PATCH] Enable support for External AP build

Enable support for build on External AP without
libcutils or any Android library support.

CRs-fixed: 2368435

Change-Id: I978127348fd6b8d90ed5ef0a714c02437dc59ee0
---
 pla/oe/loc_pla.h      | 17 +++++++++++++++++
 utils/LocSharedLock.h | 20 +++++++++++++++++++-
 utils/MsgTask.cpp     |  2 ++
 utils/configure.ac    | 18 ++++++++++++++----
 4 files changed, 52 insertions(+), 5 deletions(-)

diff --git a/pla/oe/loc_pla.h b/pla/oe/loc_pla.h
index 94468881..e795a23e 100644
--- a/pla/oe/loc_pla.h
+++ b/pla/oe/loc_pla.h
@@ -30,7 +30,10 @@
 #define __LOC_PLA__
 
 #ifdef __cplusplus
+#ifndef FEATURE_EXTERNAL_AP
 #include <utils/SystemClock.h>
+#endif /* FEATURE_EXTERNAL_AP */
+#include <inttypes.h>
 #include <sys/time.h>
 #include <time.h>
 
@@ -47,10 +50,14 @@ inline int64_t uptimeMillis()
 extern "C" {
 #endif
 
+#ifndef FEATURE_EXTERNAL_AP
 #include <cutils/properties.h>
 #include <cutils/threads.h>
 #include <cutils/sched_policy.h>
+#endif /* FEATURE_EXTERNAL_AP */
+#include <pthread.h>
 #include <sys/time.h>
+#include <sys/types.h>
 #include <string.h>
 #include <stdlib.h>
 #ifndef OFF_TARGET
@@ -76,6 +83,16 @@ extern "C" {
 #define LOC_PATH_XTWIFI_CONF_STR   "/etc/xtwifi.conf"
 #define LOC_PATH_QUIPC_CONF_STR    "/etc/quipc.conf"
 
+#ifdef FEATURE_EXTERNAL_AP
+#define PROPERTY_VALUE_MAX 92
+
+inline int property_get(const char* key, char* value, const char* default_value)
+{
+    strlcpy(value, default_value, PROPERTY_VALUE_MAX - 1);
+    return strlen(value);
+}
+#endif /* FEATURE_EXTERNAL_AP */
+
 #ifdef __cplusplus
 }
 #endif /*__cplusplus */
diff --git a/utils/LocSharedLock.h b/utils/LocSharedLock.h
index 7fe62376..a7af35ed 100644
--- a/utils/LocSharedLock.h
+++ b/utils/LocSharedLock.h
@@ -30,10 +30,28 @@
 #define __LOC_SHARED_LOCK__
 
 #include <stddef.h>
+#ifndef FEATURE_EXTERNAL_AP
 #include <cutils/atomic.h>
+#endif /* FEATURE_EXTERNAL_AP */
 #include <pthread.h>
 
-// This is a utility created for use cases such that there are more than
+#ifdef FEATURE_EXTERNAL_AP
+#include <atomic>
+
+inline int32_t android_atomic_inc(volatile int32_t *addr)
+{
+    volatile std::atomic_int_least32_t* a = (volatile std::atomic_int_least32_t*)addr;
+    return std::atomic_fetch_add_explicit(a, 1, std::memory_order_release);
+}
+
+inline int32_t android_atomic_dec(volatile int32_t *addr)
+{
+    volatile std::atomic_int_least32_t* a = (volatile std::atomic_int_least32_t*)addr;
+    return std::atomic_fetch_sub_explicit(a, 1, std::memory_order_release);
+}
+
+#endif /* FEATURE_EXTERNAL_AP */
+ // This is a utility created for use cases such that there are more than
 // one client who need to share the same lock, but it is not predictable
 // which of these clients is to last to go away. This shared lock deletes
 // itself when the last client calls its drop() method. To add a cient,
diff --git a/utils/MsgTask.cpp b/utils/MsgTask.cpp
index ad95a83e..73a77fdb 100644
--- a/utils/MsgTask.cpp
+++ b/utils/MsgTask.cpp
@@ -83,8 +83,10 @@ void MsgTask::sendMsg(const LocMsg* msg) const {
 }
 
 void MsgTask::prerun() {
+#ifndef FEATURE_EXTERNAL_AP
     // make sure we do not run in background scheduling group
      set_sched_policy(gettid(), SP_FOREGROUND);
+#endif /* FEATURE_EXTERNAL_AP */
 }
 
 bool MsgTask::run() {
diff --git a/utils/configure.ac b/utils/configure.ac
index 639f8c47..fd164943 100644
--- a/utils/configure.ac
+++ b/utils/configure.ac
@@ -28,10 +28,20 @@ AC_PROG_LN_S
 AC_PROG_MAKE_SET
 PKG_PROG_PKG_CONFIG
 
-# Checks for libraries.
-PKG_CHECK_MODULES([CUTILS], [libcutils])
-AC_SUBST([CUTILS_CFLAGS])
-AC_SUBST([CUTILS_LIBS])
+AC_ARG_WITH([external_ap],
+    AC_HELP_STRING([--with-external_ap=@<:@dir@:>@],
+        [Using External Application Processor]),
+    [],
+    with_external_ap=no)
+
+if test "x$with_external_ap" != "xno"; then
+    CPPFLAGS="${CPPFLAGS} -DFEATURE_EXTERNAL_AP"
+else
+    # Checks for libraries.
+    PKG_CHECK_MODULES([CUTILS], [libcutils])
+    AC_SUBST([CUTILS_CFLAGS])
+    AC_SUBST([CUTILS_LIBS])
+fi
 
 AC_ARG_WITH([core_includes],
       AC_HELP_STRING([--with-core-includes=@<:@dir@:>@],