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 *  @brief Interrupts controlling routines.
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 *  @brief Interrupts controlling routines.
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 */
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 */
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#include <arch/asm.h>
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#include <arch/asm.h>
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#include <arch/regutils.h>
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#include <arch/regutils.h>
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#include <arch/drivers/gxemul.h>
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#include <ddi/irq.h>
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#include <ddi/irq.h>
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#include <arch/machine.h>
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#include <ddi/device.h>
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#include <interrupt.h>
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#include <interrupt.h>
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/** Initial size of a table holding interrupt handlers. */
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/** Initial size of a table holding interrupt handlers. */
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#define IRQ_COUNT 8
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#define IRQ_COUNT 8
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static irq_t gxemul_timer_irq;
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/** Disable interrupts.
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/** Disable interrupts.
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 *
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 *
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 * @return Old interrupt priority level.
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 * @return Old interrupt priority level.
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 */
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 */
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ipl_t interrupts_disable(void)
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ipl_t interrupts_disable(void)
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{
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{
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    ipl_t ipl = current_status_reg_read();
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    ipl_t ipl = current_status_reg_read();
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    current_status_reg_control_write(STATUS_REG_IRQ_DISABLED_BIT | ipl);
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    current_status_reg_control_write(STATUS_REG_IRQ_DISABLED_BIT | ipl);
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    return ipl;
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    return ipl;
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}
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}
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 * @return Old interrupt priority level.
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 * @return Old interrupt priority level.
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 */
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 */
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ipl_t interrupts_enable(void)
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ipl_t interrupts_enable(void)
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{
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{
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    ipl_t ipl = current_status_reg_read();
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    ipl_t ipl = current_status_reg_read();
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    current_status_reg_control_write(ipl & ~STATUS_REG_IRQ_DISABLED_BIT);
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    current_status_reg_control_write(ipl & ~STATUS_REG_IRQ_DISABLED_BIT);
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    return ipl;
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    return ipl;
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}
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}
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/** Restore interrupt priority level.
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/** Restore interrupt priority level.
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 *
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 *
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ipl_t interrupts_read(void)
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ipl_t interrupts_read(void)
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{
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{
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    return current_status_reg_read();
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    return current_status_reg_read();
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}
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}
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/** Starts gxemul Real Time Clock device, which asserts regular interrupts.
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 *
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 * @param frequency Interrupts frequency (0 disables RTC).
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 */
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static void gxemul_timer_start(uint32_t frequency)
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{
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    *((uint32_t *) (gxemul_rtc + GXEMUL_RTC_FREQ_OFFSET))
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        = frequency;
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}
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static irq_ownership_t gxemul_timer_claim(irq_t *irq)
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{
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    return IRQ_ACCEPT;
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}
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/** Timer interrupt handler.
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 *
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 * @param irq Interrupt information.
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 * @param arg Not used.
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 */
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static void gxemul_timer_irq_handler(irq_t *irq)
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{
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    /*
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    * We are holding a lock which prevents preemption.
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    * Release the lock, call clock() and reacquire the lock again.
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    */
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    spinlock_unlock(&irq->lock);
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    clock();
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    spinlock_lock(&irq->lock);
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    /* acknowledge tick */
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    *((uint32_t *) (gxemul_rtc + GXEMUL_RTC_ACK_OFFSET))
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        = 0;
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}
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/** Initialize basic tables for exception dispatching
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/** Initialize basic tables for exception dispatching
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 * and starts the timer.
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 * and starts the timer.
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 */
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 */
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void interrupt_init(void)
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void interrupt_init(void)
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{
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{
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    irq_init(IRQ_COUNT, IRQ_COUNT);
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    irq_init(IRQ_COUNT, IRQ_COUNT);
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    irq_initialize(&gxemul_timer_irq);
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    gxemul_timer_irq.devno = device_assign_devno();
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    gxemul_timer_irq.inr = GXEMUL_TIMER_IRQ;
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    gxemul_timer_irq.claim = gxemul_timer_claim;
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    gxemul_timer_irq.handler = gxemul_timer_irq_handler;
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    machine_timer_irq_start();
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    irq_register(&gxemul_timer_irq);
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    gxemul_timer_start(GXEMUL_TIMER_FREQ);
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}
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}
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/** @}
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/** @}
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 */
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 */