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>

2 files changed, 6 insertions, 6 deletions

diff --git a/svm/ssvm.c b/svm/ssvm.c
index b9c6ef9fd0b..92d86e6d1e4 100644
--- a/svm/ssvm.c
+++ b/svm/ssvm.c
@@ -59,10 +59,10 @@ int ssvm_master_init (ssvm_private_t * ssvm, u32 master_index)
   if (ssvm->requested_va)
     ssvm->requested_va += randomize_baseva;
   
-  sh = ssvm->sh = (void *) mmap((void *)ssvm->requested_va, ssvm->ssvm_size, 
+  sh = ssvm->sh = (ssvm_shared_header_t *) mmap((void *)ssvm->requested_va, ssvm->ssvm_size, 
                                 PROT_READ | PROT_WRITE, flags, ssvm_fd, 0);
 
-  if ((u64) ssvm->sh == (u64) MAP_FAILED)
+  if (ssvm->sh == MAP_FAILED)
     {
       clib_unix_warning ("mmap");
       close(ssvm_fd);
@@ -78,7 +78,7 @@ int ssvm_master_init (ssvm_private_t * ssvm, u32 master_index)
     (((u8 *)sh) + MMAP_PAGESIZE, ssvm->ssvm_size - MMAP_PAGESIZE, 
      MHEAP_FLAG_DISABLE_VM | MHEAP_FLAG_THREAD_SAFE);
 
-  sh->ssvm_va = (u64) sh;
+  sh->ssvm_va = pointer_to_uword(sh);
   sh->master_index = master_index;
 
   oldheap = ssvm_push_heap (sh);
@@ -123,7 +123,7 @@ int ssvm_slave_init (ssvm_private_t * ssvm, int timeout_in_seconds)
  map_it:
     sh = (void *) mmap (0, MMAP_PAGESIZE, PROT_READ | PROT_WRITE, MAP_SHARED, 
                         ssvm_fd, 0);
-    if ((u64) sh == (u64) MAP_FAILED)
+    if (sh == MAP_FAILED)
       {
         clib_unix_warning ("slave research mmap");
         close (ssvm_fd);
@@ -150,7 +150,7 @@ int ssvm_slave_init (ssvm_private_t * ssvm, int timeout_in_seconds)
                                   MAP_SHARED | MAP_FIXED,
                                   ssvm_fd, 0);
     
-    if ((u64) sh == (u64) MAP_FAILED)
+    if (sh == MAP_FAILED)
       {
         clib_unix_warning ("slave final mmap");
         close (ssvm_fd);
diff --git a/svm/ssvm.h b/svm/ssvm.h
index 51164931962..cd34afd2928 100644
--- a/svm/ssvm.h
+++ b/svm/ssvm.h
@@ -73,7 +73,7 @@ typedef struct {
   u32 my_pid;
   u32 vlib_hw_if_index;
   u8 * name;
-  u64 requested_va;
+  uword requested_va;
   int i_am_master;
   u32 per_interface_next_index;
   u32 * rx_queue;