Added Software projects

git-svn-id: file:///srv/dev-disk-by-uuid-17e88007-4d0c-45e0-8757-cacfcc458630/repositories/svn/Diplomarbeit@55 9fe90eed-be63-e94b-8204-d34ff4c2ff93
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+/******************************************************************************
+ *
+ * $RCSfile: $
+ * $Revision: $
+ *
+ * This module provides the interface definitions for setting up and
+ * controlling the various interrupt modes present on the ARM processor.
+ * Copyright 2004, R O SoftWare
+ * No guarantees, warrantees, or promises, implied or otherwise.
+ * May be used for hobby or commercial purposes provided copyright
+ * notice remains intact.
+ *
+ *****************************************************************************/
+#ifndef INC_ARM_VIC_H
+#define INC_ARM_VIC_H
+
+/******************************************************************************
+ *
+ * MACRO Name: ISR_ENTRY()
+ *
+ * Description:
+ *    This MACRO is used upon entry to an ISR.  The current version of
+ *    the gcc compiler for ARM does not produce correct code for
+ *    interrupt routines to operate properly with THUMB code.  The MACRO
+ *    performs the following steps:
+ *
+ *    1 - Adjust address at which execution should resume after servicing
+ *        ISR to compensate for IRQ entry
+ *    2 - Save the non-banked registers r0-r12 and lr onto the IRQ stack.
+ *    3 - Get the status of the interrupted program is in SPSR.
+ *    4 - Push it onto the IRQ stack as well.
+ *
+ *****************************************************************************/
+#define ISR_ENTRY() asm volatile(" sub   lr, lr,#4\n" \
+                                 " stmfd sp!,{r0-r12,lr}\n" \
+                                 " mrs   r1, spsr\n" \
+                                 " stmfd sp!,{r1}")
+
+/******************************************************************************
+ *
+ * MACRO Name: ISR_EXIT()
+ *
+ * Description:
+ *    This MACRO is used to exit an ISR.  The current version of the gcc
+ *    compiler for ARM does not produce correct code for interrupt
+ *    routines to operate properly with THUMB code.  The MACRO performs
+ *    the following steps:
+ *
+ *    1 - Recover SPSR value from stack       
+ *    2 - and restore  its value                   
+ *    3 - Pop the return address & the saved general registers from
+ *        the IRQ stack & return
+ *
+ *****************************************************************************/
+#define ISR_EXIT()  asm volatile(" ldmfd sp!,{r1}\n" \
+                                 " msr   spsr_c,r1\n" \
+                                 " ldmfd sp!,{r0-r12,pc}^")
+
+/******************************************************************************
+ *
+ * Function Name: disableIRQ()
+ *
+ * Description:
+ *    This function sets the IRQ disable bit in the status register
+ *
+ * Calling Sequence: 
+ *    void
+ *
+ * Returns:
+ *    previous value of CPSR
+ *
+ *****************************************************************************/
+unsigned disableIRQ(void);
+
+/******************************************************************************
+ *
+ * Function Name: enableIRQ()
+ *
+ * Description:
+ *    This function clears the IRQ disable bit in the status register
+ *
+ * Calling Sequence: 
+ *    void
+ *
+ * Returns:
+ *    previous value of CPSR
+ *
+ *****************************************************************************/
+unsigned enableIRQ(void);
+
+/******************************************************************************
+ *
+ * Function Name: restoreIRQ()
+ *
+ * Description:
+ *    This function restores the IRQ disable bit in the status register
+ *    to the value contained within passed oldCPSR
+ *
+ * Calling Sequence: 
+ *    void
+ *
+ * Returns:
+ *    previous value of CPSR
+ *
+ *****************************************************************************/
+unsigned restoreIRQ(unsigned oldCPSR);
+
+/******************************************************************************
+ *
+ * Function Name: disableFIQ()
+ *
+ * Description:
+ *    This function sets the FIQ disable bit in the status register
+ *
+ * Calling Sequence: 
+ *    void
+ *
+ * Returns:
+ *    previous value of CPSR
+ *
+ *****************************************************************************/
+unsigned disableFIQ(void);
+
+/******************************************************************************
+ *
+ * Function Name: enableFIQ()
+ *
+ * Description:
+ *    This function clears the FIQ disable bit in the status register
+ *
+ * Calling Sequence: 
+ *    void
+ *
+ * Returns:
+ *    previous value of CPSR
+ *
+ *****************************************************************************/
+unsigned enableFIQ(void);
+
+/******************************************************************************
+ *
+ * Function Name: restoreIRQ()
+ *
+ * Description:
+ *    This function restores the FIQ disable bit in the status register
+ *    to the value contained within passed oldCPSR
+ *
+ * Calling Sequence: 
+ *    void
+ *
+ * Returns:
+ *    previous value of CPSR
+ *
+ *****************************************************************************/
+unsigned restoreFIQ(unsigned oldCPSR);
+
+#endif