Add a Port poll operation

zion/include/zcall.h

@@ -46,6 +46,7 @@
 #define Z_PORT_CREATE 0x50
 #define Z_PORT_SEND 0x51
 #define Z_PORT_RECV 0x52
+#define Z_PORT_POLL 0x53
 
 #define Z_IRQ_REGISTER 0x58
 
@@ -99,6 +100,10 @@ void ZThreadExit();
                                 uint8_t* bytes, uint64_t num_caps,
                                 uint64_t* caps, uint64_t* type,
                                 uint64_t* actual_bytes, uint64_t* actual_caps);
+[[nodiscard]] z_err_t ZPortPoll(uint64_t port_cap, uint64_t num_bytes,
+                                uint8_t* bytes, uint64_t num_caps,
+                                uint64_t* caps, uint64_t* type,
+                                uint64_t* actual_bytes, uint64_t* actual_caps);
 [[nodiscard]] z_err_t ZIrqRegister(uint64_t irq_num, uint64_t* port_cap);
 
 [[nodiscard]] z_err_t ZDebug(const char* message);

zion/include/zerrors.h

@@ -10,6 +10,7 @@
 #define Z_ERR_BUFF_SIZE 005
 #define Z_ERR_NULL 0x6
 #define Z_ERR_EXISTS 0x7
+#define Z_ERR_EMPTY 0x8
 
 #define Z_ERR_CAP_NOT_FOUND 0x100
 #define Z_ERR_CAP_TYPE 0x101