static int ppc_clock_exception_handler_e300( BSP_Exception_frame *frame, unsigned number)
{
uint32_t msr;
/* Increment clock ticks */
Clock_driver_ticks += 1;
/* Enable external exceptions */
msr = ppc_external_exceptions_enable();
/* Call clock ticker */
ppc_clock_tick();
/* Restore machine state */
ppc_external_exceptions_disable( msr);
return 0;
}
static int ppc_clock_exception_handler(
BSP_Exception_frame *frame,
unsigned number
)
{
uint32_t delta = ppc_clock_decrementer_value;
uint32_t next = ppc_clock_next_time_base;
uint32_t dec = 0;
uint32_t now = 0;
uint32_t msr = 0;
do {
/* Increment clock ticks */
Clock_driver_ticks += 1;
/* Enable external exceptions */
msr = ppc_external_exceptions_enable();
/* Call clock ticker */
ppc_clock_tick();
/* Restore machine state */
ppc_external_exceptions_disable( msr);
/* Next time base */
next += delta;
/* Current time */
now = ppc_time_base();
/* New decrementer value */
dec = next - now;
} while (dec > delta);
/* Set decrementer */
ppc_set_decrementer_register( dec);
/* Expected next time base */
ppc_clock_next_time_base = next;
return 0;
}
static int ppc_clock_exception_handler_booke( BSP_Exception_frame *frame, unsigned number)
{
uint32_t msr;
/* Acknowledge decrementer request */
PPC_SET_SPECIAL_PURPOSE_REGISTER( BOOKE_TSR, BOOKE_TSR_DIS);
/* Increment clock ticks */
Clock_driver_ticks += 1;
/* Enable external exceptions */
msr = ppc_external_exceptions_enable();
/* Call clock ticker */
ppc_clock_tick();
/* Restore machine state */
ppc_external_exceptions_disable( msr);
return 0;
}
