SMCCC/PCI: Handle std svc boilerplate

Add SMC wrappers for handshaking the existence
and basic parameter validation for the SMCCC/PCI
API. The actual read/write/segment validation is
implemented by a given platform which will enable
the API by defining SMC_PCI_SUPPORT.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Change-Id: I4485ad0fe6003cec6f5eedef688914d100513c21
diff --git a/services/std_svc/std_svc_setup.c b/services/std_svc/std_svc_setup.c
index 540bb86..7f0252d 100644
--- a/services/std_svc/std_svc_setup.c
+++ b/services/std_svc/std_svc_setup.c
@@ -13,6 +13,7 @@
 #include <lib/pmf/pmf.h>
 #include <lib/psci/psci.h>
 #include <lib/runtime_instr.h>
+#include <services/pci_svc.h>
 #include <services/sdei.h>
 #include <services/spm_mm_svc.h>
 #include <services/spmd_svc.h>
@@ -158,6 +159,13 @@
 	}
 #endif
 
+#if SMC_PCI_SUPPORT
+	if (is_pci_fid(smc_fid)) {
+		return pci_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle,
+				       flags);
+	}
+#endif
+
 	switch (smc_fid) {
 	case ARM_STD_SVC_CALL_COUNT:
 		/*