Matthias
373a8c32b2
git-svn-id: file:///srv/dev-disk-by-uuid-17e88007-4d0c-45e0-8757-cacfcc458630/repositories/svn/Diplomarbeit@55 9fe90eed-be63-e94b-8204-d34ff4c2ff93
158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
/******************************************************************************
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*
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* $RCSfile: $
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* $Revision: $
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*
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* This module provides the interface definitions for setting up and
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* controlling the various interrupt modes present on the ARM processor.
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* Copyright 2004, R O SoftWare
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* No guarantees, warrantees, or promises, implied or otherwise.
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* May be used for hobby or commercial purposes provided copyright
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* notice remains intact.
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*
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*****************************************************************************/
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#ifndef INC_ARM_VIC_H
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#define INC_ARM_VIC_H
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/******************************************************************************
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*
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* MACRO Name: ISR_ENTRY()
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*
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* Description:
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* This MACRO is used upon entry to an ISR. The current version of
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* the gcc compiler for ARM does not produce correct code for
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* interrupt routines to operate properly with THUMB code. The MACRO
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* performs the following steps:
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*
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* 1 - Adjust address at which execution should resume after servicing
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* ISR to compensate for IRQ entry
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* 2 - Save the non-banked registers r0-r12 and lr onto the IRQ stack.
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* 3 - Get the status of the interrupted program is in SPSR.
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* 4 - Push it onto the IRQ stack as well.
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*
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*****************************************************************************/
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#define ISR_ENTRY() asm volatile(" sub lr, lr,#4\n" \
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" stmfd sp!,{r0-r12,lr}\n" \
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" mrs r1, spsr\n" \
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" stmfd sp!,{r1}")
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/******************************************************************************
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*
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* MACRO Name: ISR_EXIT()
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*
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* Description:
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* This MACRO is used to exit an ISR. The current version of the gcc
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* compiler for ARM does not produce correct code for interrupt
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* routines to operate properly with THUMB code. The MACRO performs
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* the following steps:
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*
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* 1 - Recover SPSR value from stack
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* 2 - and restore its value
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* 3 - Pop the return address & the saved general registers from
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* the IRQ stack & return
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*
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*****************************************************************************/
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#define ISR_EXIT() asm volatile(" ldmfd sp!,{r1}\n" \
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" msr spsr_c,r1\n" \
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" ldmfd sp!,{r0-r12,pc}^")
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/******************************************************************************
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*
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* Function Name: disableIRQ()
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*
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* Description:
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* This function sets the IRQ disable bit in the status register
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*
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* Calling Sequence:
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* void
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*
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* Returns:
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* previous value of CPSR
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*
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*****************************************************************************/
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unsigned disableIRQ(void);
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/******************************************************************************
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*
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* Function Name: enableIRQ()
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*
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* Description:
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* This function clears the IRQ disable bit in the status register
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*
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* Calling Sequence:
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* void
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*
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* Returns:
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* previous value of CPSR
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*
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*****************************************************************************/
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unsigned enableIRQ(void);
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/******************************************************************************
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*
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* Function Name: restoreIRQ()
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*
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* Description:
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* This function restores the IRQ disable bit in the status register
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* to the value contained within passed oldCPSR
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*
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* Calling Sequence:
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* void
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*
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* Returns:
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* previous value of CPSR
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*
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*****************************************************************************/
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unsigned restoreIRQ(unsigned oldCPSR);
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/******************************************************************************
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*
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* Function Name: disableFIQ()
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*
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* Description:
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* This function sets the FIQ disable bit in the status register
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*
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* Calling Sequence:
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* void
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*
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* Returns:
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* previous value of CPSR
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*
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*****************************************************************************/
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unsigned disableFIQ(void);
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/******************************************************************************
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*
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* Function Name: enableFIQ()
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*
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* Description:
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* This function clears the FIQ disable bit in the status register
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*
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* Calling Sequence:
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* void
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*
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* Returns:
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* previous value of CPSR
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*
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*****************************************************************************/
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unsigned enableFIQ(void);
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/******************************************************************************
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*
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* Function Name: restoreIRQ()
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*
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* Description:
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* This function restores the FIQ disable bit in the status register
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* to the value contained within passed oldCPSR
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*
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* Calling Sequence:
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* void
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*
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* Returns:
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* previous value of CPSR
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*
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*****************************************************************************/
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unsigned restoreFIQ(unsigned oldCPSR);
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#endif
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