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32 /*****************************************************************************/
35 * @file xil_exception.h
37 * This header file contains ARM Cortex R5 specific exception related APIs.
38 * For exception related functions that can be used across all Xilinx supported
39 * processors, please use xil_exception.h.
42 * MODIFICATION HISTORY:
44 * Ver Who Date Changes
45 * ----- -------- -------- -----------------------------------------------
46 * 5.00 pkp 02/20/14 First release
49 ******************************************************************************/
51 #ifndef XIL_EXCEPTION_H /* prevent circular inclusions */
52 #define XIL_EXCEPTION_H /* by using protection macros */
54 /***************************** Include Files ********************************/
56 #include "xil_types.h"
57 #include "xpseudo_asm.h"
63 /************************** Constant Definitions ****************************/
65 #define XIL_EXCEPTION_FIQ XREG_CPSR_FIQ_ENABLE
66 #define XIL_EXCEPTION_IRQ XREG_CPSR_IRQ_ENABLE
67 #define XIL_EXCEPTION_ALL (XREG_CPSR_FIQ_ENABLE | XREG_CPSR_IRQ_ENABLE)
69 #define XIL_EXCEPTION_ID_FIRST 0U
70 #define XIL_EXCEPTION_ID_RESET 0U
71 #define XIL_EXCEPTION_ID_UNDEFINED_INT 1U
72 #define XIL_EXCEPTION_ID_SWI_INT 2U
73 #define XIL_EXCEPTION_ID_PREFETCH_ABORT_INT 3U
74 #define XIL_EXCEPTION_ID_DATA_ABORT_INT 4U
75 #define XIL_EXCEPTION_ID_IRQ_INT 5U
76 #define XIL_EXCEPTION_ID_FIQ_INT 6U
77 #define XIL_EXCEPTION_ID_LAST 6U
80 * XIL_EXCEPTION_ID_INT is defined for all Xilinx processors.
82 #define XIL_EXCEPTION_ID_INT XIL_EXCEPTION_ID_IRQ_INT
84 /**************************** Type Definitions ******************************/
87 * This typedef is the exception handler function.
89 typedef void (*Xil_ExceptionHandler)(void *data);
90 typedef void (*Xil_InterruptHandler)(void *data);
92 /***************** Macros (Inline Functions) Definitions ********************/
94 /****************************************************************************/
98 * @param Mask for exceptions to be enabled.
102 * @note If bit is 0, exception is enabled.
103 * C-Style signature: void Xil_ExceptionEnableMask(Mask)
105 ******************************************************************************/
106 #define Xil_ExceptionEnableMask(Mask) \
107 mtcpsr(mfcpsr() & ~ ((Mask) & XIL_EXCEPTION_ALL))
110 /****************************************************************************/
112 * Enable the IRQ exception.
118 ******************************************************************************/
119 #define Xil_ExceptionEnable() \
120 Xil_ExceptionEnableMask(XIL_EXCEPTION_IRQ)
122 /****************************************************************************/
124 * Disable Exceptions.
126 * @param Mask for exceptions to be enabled.
130 * @note If bit is 1, exception is disabled.
131 * C-Style signature: Xil_ExceptionDisableMask(Mask)
133 ******************************************************************************/
134 #define Xil_ExceptionDisableMask(Mask) \
135 mtcpsr(mfcpsr() | ((Mask) & XIL_EXCEPTION_ALL))
137 /****************************************************************************/
139 * Disable the IRQ exception.
145 ******************************************************************************/
146 #define Xil_ExceptionDisable() \
147 Xil_ExceptionDisableMask(XIL_EXCEPTION_IRQ)
149 /****************************************************************************/
151 * Enable nested interrupts by clearing the I and F bits it CPSR
155 * @note This macro is supposed to be used from interrupt handlers. In the
156 * interrupt handler the interrupts are disabled by default (I and F
157 * are 1). To allow nesting of interrupts, this macro should be
158 * used. It clears the I and F bits by changing the ARM mode to
159 * system mode. Once these bits are cleared and provided the
160 * preemption of interrupt conditions are met in the GIC, nesting of
161 * interrupts will start happening.
162 * Caution: This macro must be used with caution. Before calling this
163 * macro, the user must ensure that the source of the current IRQ
164 * is appropriately cleared. Otherwise, as soon as we clear the I and
165 * F bits, there can be an infinite loop of interrupts with an
166 * eventual crash (all the stack space getting consumed).
167 ******************************************************************************/
168 #define Xil_EnableNestedInterrupts() \
169 __asm__ __volatile__ ("mrs lr, spsr"); \
170 __asm__ __volatile__ ("stmfd sp!, {lr}"); \
171 __asm__ __volatile__ ("msr cpsr_c, #0x1F"); \
172 __asm__ __volatile__ ("stmfd sp!, {lr}");
174 /****************************************************************************/
176 * Disable the nested interrupts by setting the I and F bits.
180 * @note This macro is meant to be called in the interrupt service routines.
181 * This macro cannot be used independently. It can only be used when
182 * nesting of interrupts have been enabled by using the macro
183 * Xil_EnableNestedInterrupts(). In a typical flow, the user first
184 * calls the Xil_EnableNestedInterrupts in the ISR at the appropriate
185 * point. The user then must call this macro before exiting the interrupt
186 * service routine. This macro puts the ARM back in IRQ/FIQ mode and
187 * hence sets back the I and F bits.
188 ******************************************************************************/
189 #define Xil_DisableNestedInterrupts() \
190 __asm__ __volatile__ ("ldmfd sp!, {lr}"); \
191 __asm__ __volatile__ ("msr cpsr_c, #0x92"); \
192 __asm__ __volatile__ ("ldmfd sp!, {lr}"); \
193 __asm__ __volatile__ ("msr spsr_cxsf, lr");
195 /************************** Variable Definitions ****************************/
197 /************************** Function Prototypes *****************************/
199 extern void Xil_ExceptionRegisterHandler(u32 Exception_id,
200 Xil_ExceptionHandler Handler,
203 extern void Xil_ExceptionRemoveHandler(u32 Exception_id);
205 extern void Xil_ExceptionInit(void);
207 extern void Xil_DataAbortHandler(void *CallBackRef);
209 extern void Xil_PrefetchAbortHandler(void *CallBackRef);
213 #endif /* __cplusplus */
215 #endif /* XIL_EXCEPTION_H */