trusty: implement hypercall to initialize trusty

UOS_Loader will trigger boot of Trusty-OS by HC_INITIALIZE_TRUSTY.
UOS_Loader will load trusty image and alloc runtime memory for
trusty. UOS_Loader will transfer these information include
trusty runtime memory base address, entry address and memory
size to hypervisor by trusty_boot_param structure.

In hypervisor, once HC_INITIALIZE_TRUSTY received, it will create
EPT for Secure World, save Normal World vCPU context, init
Secure World vCPU context and switch World state to Secure World.

Signed-off-by: Qi Yadong <yadong.qi@intel.com>

hypervisor/include/common/hypercall.h

@@ -335,6 +335,17 @@ int64_t hcall_setup_sbuf(struct vm *vm, uint64_t param);
  */
 int64_t hcall_world_switch(struct vcpu *vcpu);
 
+/**
+ * @brief Initialize environment for Trusty-OS on a VCPU.
+ *
+ * @param VCPU Pointer to VCPU data structure
+ * @param param's guest physical address. This gpa points to
+ *              struct trusty_boot_param
+ *
+ * @return 0 on success, non-zero on error.
+ */
+int64_t hcall_initialize_trusty(struct vcpu *vcpu, uint64_t param);
+
 /**
  * @}
  */