101 lines
1.8 KiB
C
101 lines
1.8 KiB
C
#include <sys-interrupt.h>
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#include <interrupt-utils.h>
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#include <AT91SAM7S64.h>
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#define ATTR
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#ifndef NULL
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#define NULL 0
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#endif
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static SystemInterruptHandler *handlers = NULL;
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static void
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system_int_safe (void) __attribute__((noinline));
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static void
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system_int_safe (void)
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{
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SystemInterruptHandler *h;
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h = handlers;
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while (h) {
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if (h->handler()) break;
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h = h->next;
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}
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}
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static void NACKEDFUNC ATTR
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system_int (void) /* System Interrupt Handler */
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{
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ISR_ENTRY();
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system_int_safe();
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*AT91C_AIC_EOICR = 0; /* End of Interrupt */
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ISR_EXIT();
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}
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static unsigned int enabled = 0; /* Number of times the system
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interrupt has been enabled */
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#define DIS_INT *AT91C_AIC_IDCR = (1 << AT91C_ID_SYS)
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#define EN_INT if (enabled > 0) *AT91C_AIC_IECR = (1 << AT91C_ID_SYS)
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void
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sys_interrupt_enable()
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{
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if (enabled++ == 0) {
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/* Level trigged at priority 5 */
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AT91C_AIC_SMR[AT91C_ID_SYS] = AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL | 5;
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/* Interrupt vector */
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AT91C_AIC_SVR[AT91C_ID_SYS] = (unsigned long) system_int;
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/* Enable */
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EN_INT;
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}
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}
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void
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sys_interrupt_disable()
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{
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if (--enabled == 0) {
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DIS_INT;
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}
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}
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void
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sys_interrupt_append_handler(SystemInterruptHandler *handler)
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{
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SystemInterruptHandler **h = &handlers;
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while(*h) {
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h = &(*h)->next;
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}
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DIS_INT;
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*h = handler;
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handler->next = NULL;
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EN_INT;
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}
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void
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sys_interrupt_prepend_handler(SystemInterruptHandler *handler)
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{
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DIS_INT;
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handler->next = handlers;
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handlers = handler;
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EN_INT;
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}
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void
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sys_interrupt_remove_handler(SystemInterruptHandler *handler)
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{
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SystemInterruptHandler **h = &handlers;
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while(*h) {
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if (*h == handler) {
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DIS_INT;
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*h = handler->next;
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EN_INT;
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break;
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}
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h = &(*h)->next;
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}
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}
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