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#include <arch/memstr.h>
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#include <arch/memstr.h>
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#include <arch/regutils.h>
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#include <arch/regutils.h>
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#include <interrupt.h>
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#include <interrupt.h>
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#include <arch/mm/page_fault.h>
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#include <arch/mm/page_fault.h>
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#include <arch/barrier.h>
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#include <arch/barrier.h>
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#include <arch/drivers/gxemul.h>
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#include <arch/machine.h>
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#include <print.h>
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#include <print.h>
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#include <syscall/syscall.h>
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#include <syscall/syscall.h>
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/** Offset used in calculation of exception handler's relative address.
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/** Offset used in calculation of exception handler's relative address.
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 *
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 *
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            "mov r3, r13\n"
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            "mov r3, r13\n"
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            "stmfd r13!, {r2}\n"
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            "stmfd r13!, {r2}\n"
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            "mov r2, lr\n"
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            "mov r2, lr\n"
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            "stmfd r13!, {r4-r12}\n"
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            "stmfd r13!, {r4-r12}\n"
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            "mov r1, r13\n"
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            "mov r1, r13\n"
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            /* the following two lines are for debugging */
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            /* the following two lines are for debugging */
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            "mov sp, #0\n"
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            "mov sp, #0\n"
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            "mov lr, #0\n"
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            "mov lr, #0\n"
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            "msr cpsr_c, r0\n"
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            "msr cpsr_c, r0\n"
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        "mov lr, r2         \n"
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        "mov lr, r2         \n"
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        "msr cpsr_c, r0         \n"
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        "msr cpsr_c, r0         \n"
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        /* actual return */
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        /* actual return */
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    "2:\n"
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    "2:\n"
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        "ldmfd r13, {r0-r12, pc}^\n"
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        "ldmfd r13!, {r0-r12, pc}^\n"
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    );
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    );
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}
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}
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/** Switch CPU to mode in which interrupts are serviced (currently it
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/** Switch CPU to mode in which interrupts are serviced (currently it
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{
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{
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    istate->r0 = syscall_handler(istate->r0, istate->r1, istate->r2,
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    istate->r0 = syscall_handler(istate->r0, istate->r1, istate->r2,
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        istate->r3, istate->r4, istate->r5, istate->r6);
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        istate->r3, istate->r4, istate->r5, istate->r6);
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}
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}
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/** Returns the mask of active interrupts. */
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static inline uint32_t gxemul_irqc_get_sources(void)
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{
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    return *((uint32_t *) gxemul_irqc);
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}
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/** Interrupt Exception handler.
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 *
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 * Determines the sources of interrupt and calls their handlers.
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 */
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static void irq_exception(int exc_no, istate_t *istate)
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{
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    uint32_t sources = gxemul_irqc_get_sources();
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    unsigned int i;
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    for (i = 0; i < GXEMUL_IRQC_MAX_IRQ; i++) {
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        if (sources & (1 << i)) {
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            irq_t *irq = irq_dispatch_and_lock(i);
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            if (irq) {
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                /* The IRQ handler was found. */
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                irq->handler(irq);
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                spinlock_unlock(&irq->lock);
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            } else {
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                /* Spurious interrupt.*/
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                printf("cpu%d: spurious interrupt (inum=%d)\n",
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                    CPU->id, i);
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            }
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        }
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    }
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}
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/** Fills exception vectors with appropriate exception handlers. */
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/** Fills exception vectors with appropriate exception handlers. */
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void install_exception_handlers(void)
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void install_exception_handlers(void)
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{
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{
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    install_handler((unsigned) reset_exception_entry,
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    install_handler((unsigned) reset_exception_entry,
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        (unsigned *) EXC_RESET_VEC);
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        (unsigned *) EXC_RESET_VEC);
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        :: [control_reg] "r" (control_reg)
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        :: [control_reg] "r" (control_reg)
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    );
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    );
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}
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}
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#endif
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#endif
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/** Interrupt Exception handler.
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 *
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 * Determines the sources of interrupt and calls their handlers.
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 */
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static void irq_exception(int exc_no, istate_t *istate)
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{
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    machine_irq_exception(exc_no, istate);
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}
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/** Initializes exception handling.
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/** Initializes exception handling.
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 *
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 *
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 * Installs low-level exception handlers and then registers
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 * Installs low-level exception handlers and then registers
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 * exceptions and their handlers to kernel exception dispatcher.
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 * exceptions and their handlers to kernel exception dispatcher.
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 */
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 */