Add support for AArch32

gcc version 4.9.2 (Raspbian 4.9.2-10)
Tested on Linux raspberrypi 4.4.6-v7+ #875 SMP Tue Apr 12 16:33:02 BST 2016 armv7l GNU/Linux

CPUs may be little or big endian, detect with gcc flags, not the processor architecture
Add a new flag $(PLATFORM)_uses_openssl which allows to disable the link with openssl lib.

vlib/vlib/threads.c:
startup.conf must:
- specify the heapsize as we don't have hugepages on raspbian

cpu {
  main-core 3
}
heapsize 64M

Corrects in various files the assumption uword == u64 and replaces 'u64' cast with 'pointer_to_uword' and 'uword_to_pointer' where appropriate.
256 CPUs may create an OOM when testing with small memory footprint ( heapsize 64M ), allows the number of VLIB_MAX_CPUS to be set in platforms/*.mk

vppinfra/vppinfra/longjmp.S:
ARM - copy r1 (1st parameter of the setjmp call) to r0 (return value)

vppinfra/vppinfra/time.h:
On ARMv7 in AArch32 mode, we can access to a 64bit register to retreive the cycles count.
gcc on rpi only declare ARM_ARCH 6. Override this info, and check if it is possible to use 'mrrc'.
/!\ the time function will NOT work without allowing the user mode access to the PMU.
You may download the source of the kmod here:
https://github.com/christophefontaine/arm_rdtsc

Change-Id: I8142606436d9671a184133b935398427f08a8bd2
Signed-off-by: Christophe Fontaine <christophe.fontaine@qosmos.com>

10 files changed, 20 insertions, 14 deletions

diff --git a/vppinfra/vppinfra/byte_order.h b/vppinfra/vppinfra/byte_order.h
index 4f385f152df..b2c26e5fdee 100644
--- a/vppinfra/vppinfra/byte_order.h
+++ b/vppinfra/vppinfra/byte_order.h
@@ -40,7 +40,7 @@
 
 #include <vppinfra/clib.h>
 
-#if defined(__x86_64__) || defined(i386) || defined(__aarch64__)
+#if (__BYTE_ORDER__)==( __ORDER_LITTLE_ENDIAN__)
 #define CLIB_ARCH_IS_BIG_ENDIAN (0)
 #define CLIB_ARCH_IS_LITTLE_ENDIAN (1)
 #else
diff --git a/vppinfra/vppinfra/cache.h b/vppinfra/vppinfra/cache.h
index fea111698a2..92e1e8cf777 100644
--- a/vppinfra/vppinfra/cache.h
+++ b/vppinfra/vppinfra/cache.h
@@ -45,7 +45,7 @@
  */
 #ifndef CLIB_LOG2_CACHE_LINE_BYTES
 
-#ifdef __x86_64__
+#if defined(__x86_64__) || defined(__ARM_ARCH_7A__)
 #define CLIB_LOG2_CACHE_LINE_BYTES 6
 #endif
 
diff --git a/vppinfra/vppinfra/hash.c b/vppinfra/vppinfra/hash.c
index 9e038b4fd8c..adadf010a0c 100644
--- a/vppinfra/vppinfra/hash.c
+++ b/vppinfra/vppinfra/hash.c
@@ -88,7 +88,7 @@ static inline u64 zap64 (u64 x, word n)
     return x & masks_little_endian[n];
 }
 
-u64 hash_memory64 (void * p, word n_bytes, u64 state)
+static inline u64 hash_memory64 (void * p, word n_bytes, u64 state)
 {
   u64 * q = p;
   u64 a, b, c, n;
@@ -155,7 +155,7 @@ static inline u32 zap32 (u32 x, word n)
     return x & masks_little_endian[n];
 }
 
-u32 hash_memory32 (void * p, word n_bytes, u32 state)
+static inline u32 hash_memory32 (void * p, word n_bytes, u32 state)
 {
   u32 * q = p;
   u32 a, b, c, n;
diff --git a/vppinfra/vppinfra/hash.h b/vppinfra/vppinfra/hash.h
index 3c4daada48b..978230b6ca0 100644
--- a/vppinfra/vppinfra/hash.h
+++ b/vppinfra/vppinfra/hash.h
@@ -586,8 +586,6 @@ do {						\
   hash_v3_finalize_step_2_u32x(a,b,c);		\
 } while (0)
 
-extern u64 hash_memory64 (void * p, word n_bytes, u64 state);
-extern u32 hash_memory32 (void * p, word n_bytes, u32 state);
 extern uword hash_memory (void * p, word n_bytes, uword state);
 
 extern uword mem_key_sum (hash_t * h, uword key);
diff --git a/vppinfra/vppinfra/longjmp.S b/vppinfra/vppinfra/longjmp.S
index 9ba237d4489..d4dd4c7d916 100644
--- a/vppinfra/vppinfra/longjmp.S
+++ b/vppinfra/vppinfra/longjmp.S
@@ -478,7 +478,7 @@ clib_setjmp:
 #endif
 
 	/* Give back user's return value. */
-	mov r1, r0
+	mov r0, r1
 	bx lr
 	
 	.global clib_longjmp
@@ -501,7 +501,7 @@ clib_longjmp:
 #endif
 	
 	/* Give back user's return value. */
-	mov r1, r0
+	mov r0, r1
 	bx lr
 
 	.global clib_calljmp
diff --git a/vppinfra/vppinfra/macros.c b/vppinfra/vppinfra/macros.c
index 4107464e99e..f16948ef0e4 100644
--- a/vppinfra/vppinfra/macros.c
+++ b/vppinfra/vppinfra/macros.c
@@ -214,7 +214,7 @@ void clib_macro_init(macro_main_t * mm)
 {
   if (mm->the_builtin_eval_hash != 0)
     {
-      clib_warning ("mm %llx already initialized", (u64)mm);
+      clib_warning ("mm %p already initialized", mm);
       return;
     }
 
diff --git a/vppinfra/vppinfra/random_isaac.c b/vppinfra/vppinfra/random_isaac.c
index e9287402e52..ad2c165da46 100644
--- a/vppinfra/vppinfra/random_isaac.c
+++ b/vppinfra/vppinfra/random_isaac.c
@@ -110,7 +110,7 @@ void isaac2 (isaac_t * ctx, uword * results)
   u32 a##n, b##n, c##n, x##n, y##n, * m##n, * mm##n, * m2##n, * r##n, * mend##n
 
   _ (0); _ (1);
-
+  (void)mend1; /* "set but unused variable" error on mend1 with gcc 4.9  */
 #undef _
 
 #define _(n)							\
diff --git a/vppinfra/vppinfra/test_vec.c b/vppinfra/vppinfra/test_vec.c
index 12c0603ec8d..80832bf52fd 100644
--- a/vppinfra/vppinfra/test_vec.c
+++ b/vppinfra/vppinfra/test_vec.c
@@ -1050,7 +1050,7 @@ int test_vec_main (unformat_input_t * input)
       u8 * bigboy = 0;
       u64 one_gig = (1<<30);
       u64 size;
-      i64 index;
+      u64 index;
 
       fformat (stdout, "giant vector test...");
       size = 5ULL * one_gig;
@@ -1090,7 +1090,7 @@ int main (int argc, char * argv[])
   unformat_input_t i;
   int ret;
 
-  mheap_alloc (0, 10ULL<<30);
+  mheap_alloc (0, (uword)10ULL<<30);
 
   verbose = (argc > 1);
   unformat_init_command_line (&i, argv);
diff --git a/vppinfra/vppinfra/time.h b/vppinfra/vppinfra/time.h
index 3c481082ced..29398f3baea 100644
--- a/vppinfra/vppinfra/time.h
+++ b/vppinfra/vppinfra/time.h
@@ -113,7 +113,14 @@ always_inline u64 clib_cpu_time_now (void)
 }
 
 #elif defined (__arm__)
-
+#if defined(__ARM_ARCH_7A__)
+always_inline u64 clib_cpu_time_now (void)
+{
+  u64 tsc;
+  asm volatile("mrrc p15, 0, %Q0, %R0, c9" : "=r" (tsc));
+  return tsc;
+}
+#else
 always_inline u64 clib_cpu_time_now (void)
 {
   u32 lo;
@@ -121,6 +128,7 @@ always_inline u64 clib_cpu_time_now (void)
 		: [lo] "=r" (lo));
   return (u64) lo;
 }
+#endif
 
 #elif defined (__xtensa__)
 
diff --git a/vppinfra/vppinfra/vector.h b/vppinfra/vppinfra/vector.h
index 84c52a2836d..a6f4111e88c 100644
--- a/vppinfra/vppinfra/vector.h
+++ b/vppinfra/vppinfra/vector.h
@@ -61,7 +61,7 @@
 
 #define _vector_size(n) __attribute__ ((vector_size (n)))
 
-#if defined (__aarch64__)
+#if defined (__aarch64__) || defined (__arm__)
 typedef unsigned int u32x4 _vector_size (16);
 #endif