update IAR CM3 port to avoid including FreeRTOSConfig.h in portasm.s

Author: tanche

portable/IAR/ARM_CM3/port.c

@@ -137,6 +137,11 @@ extern void vPortSVCHandler( void );
 extern void xPortPendSVHandler( void );
 /*-----------------------------------------------------------*/
 
+/* store Max Syscall Interrupt Priority to be able to get it
+ * in portasm.s without included FreeRTOSConfig.h
+ */
+const uint32_t portConfigMaxSyscallIntPriority = configMAX_SYSCALL_INTERRUPT_PRIORITY;
+
 /* Each task maintains its own interrupt status in the critical nesting
  * variable. */
 static UBaseType_t uxCriticalNesting = 0xaaaaaaaa;

portable/IAR/ARM_CM3/portasm.s

@@ -26,13 +26,13 @@
  *
  */
 
-#include <FreeRTOSConfig.h>
 
     RSEG    CODE:CODE(2)
     thumb
 
     EXTERN pxCurrentTCB
     EXTERN vTaskSwitchContext
+    EXTERN portConfigMaxSyscallIntPriority
 
     PUBLIC xPortPendSVHandler
     PUBLIC vPortSVCHandler
@@ -52,7 +52,7 @@ xPortPendSVHandler:
     str r0, [r2]                    /* Save the new top of stack into the first member of the TCB. */
 
     stmdb sp!, {r3, r14}
-    mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY
+    ldr r0, =portConfigMaxSyscallIntPriority
     msr basepri, r0
     dsb
     isb