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32 /*****************************************************************************/
35 * @file xil_exception.h
37 * This header file contains ARM Cortex A9 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 * 1.00a ecm/sdm 11/04/09 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 0
70 #define XIL_EXCEPTION_ID_RESET 0
71 #define XIL_EXCEPTION_ID_UNDEFINED_INT 1
72 #define XIL_EXCEPTION_ID_SWI_INT 2
73 #define XIL_EXCEPTION_ID_PREFETCH_ABORT_INT 3
74 #define XIL_EXCEPTION_ID_DATA_ABORT_INT 4
75 #define XIL_EXCEPTION_ID_IRQ_INT 5
76 #define XIL_EXCEPTION_ID_FIQ_INT 6
77 #define XIL_EXCEPTION_ID_LAST 6
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 ******************************************************************************/
107 #define Xil_ExceptionEnableMask(Mask) \
108 mtcpsr(mfcpsr() & ~ (Mask & XIL_EXCEPTION_ALL))
110 #define Xil_ExceptionEnableMask(Mask) \
111 { register unsigned int Reg __asm("cpsr"); \
112 mtcpsr(Reg & ~ (Mask & XIL_EXCEPTION_ALL)) }
115 /****************************************************************************/
117 * Enable the IRQ exception.
123 ******************************************************************************/
124 #define Xil_ExceptionEnable() \
125 Xil_ExceptionEnableMask(XIL_EXCEPTION_IRQ)
127 /****************************************************************************/
129 * Disable Exceptions.
131 * @param Mask for exceptions to be enabled.
135 * @note If bit is 1, exception is disabled.
136 * C-Style signature: Xil_ExceptionDisableMask(Mask);
138 ******************************************************************************/
140 #define Xil_ExceptionDisableMask(Mask) \
141 mtcpsr(mfcpsr() | (Mask & XIL_EXCEPTION_ALL))
143 #define Xil_ExceptionDisableMask(Mask) \
144 { register unsigned int Reg __asm("cpsr"); \
145 mtcpsr(Reg | (Mask & XIL_EXCEPTION_ALL)) }
148 /****************************************************************************/
150 * Disable the IRQ exception.
156 ******************************************************************************/
157 #define Xil_ExceptionDisable() \
158 Xil_ExceptionDisableMask(XIL_EXCEPTION_IRQ)
160 /****************************************************************************/
162 * Enable nested interrupts by clearing the I and F bits it CPSR
166 * @note This macro is supposed to be used from interrupt handlers. In the
167 * interrupt handler the interrupts are disabled by default (I and F
168 * are 1). To allow nesting of interrupts, this macro should be
169 * used. It clears the I and F bits by changing the ARM mode to
170 * system mode. Once these bits are cleared and provided the
171 * preemption of interrupt conditions are met in the GIC, nesting of
172 * interrupts will start happening.
173 * Caution: This macro must be used with caution. Before calling this
174 * macro, the user must ensure that the source of the current IRQ
175 * is appropriately cleared. Otherwise, as soon as we clear the I and
176 * F bits, there can be an infinite loop of interrupts with an
177 * eventual crash (all the stack space getting consumed).
178 ******************************************************************************/
179 #define Xil_EnableNestedInterrupts() \
180 __asm__ __volatile__ ("mrs lr, spsr"); \
181 __asm__ __volatile__ ("stmfd sp!, {lr}"); \
182 __asm__ __volatile__ ("msr cpsr_c, #0x1F"); \
183 __asm__ __volatile__ ("stmfd sp!, {lr}");
185 /****************************************************************************/
187 * Disable the nested interrupts by setting the I and F bits.
191 * @note This macro is meant to be called in the interrupt service routines.
192 * This macro cannot be used independently. It can only be used when
193 * nesting of interrupts have been enabled by using the macro
194 * Xil_EnableNestedInterrupts(). In a typical flow, the user first
195 * calls the Xil_EnableNestedInterrupts in the ISR at the appropriate
196 * point. The user then must call this macro before exiting the interrupt
197 * service routine. This macro puts the ARM back in IRQ/FIQ mode and
198 * hence sets back the I and F bits.
199 ******************************************************************************/
200 #define Xil_DisableNestedInterrupts() \
201 __asm__ __volatile__ ("ldmfd sp!, {lr}"); \
202 __asm__ __volatile__ ("msr cpsr_c, #0x92"); \
203 __asm__ __volatile__ ("ldmfd sp!, {lr}"); \
204 __asm__ __volatile__ ("msr spsr_cxsf, lr");
206 /************************** Variable Definitions ****************************/
208 /************************** Function Prototypes *****************************/
210 extern void Xil_ExceptionRegisterHandler(u32 id,
211 Xil_ExceptionHandler handler,
214 extern void Xil_ExceptionRemoveHandler(u32 id);
216 extern void Xil_ExceptionInit(void);
220 #endif /* __cplusplus */
222 #endif /* XIL_EXCEPTION_H */