interrupt_util.h

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/*
 * Copyright (c) 2018 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef INTERRUPT_UTIL_H_
#define INTERRUPT_UTIL_H_
 
#define MS_TO_US(ms)  (ms * USEC_PER_MSEC)
 
#if defined(CONFIG_CPU_CORTEX_M)
#include <cmsis_core.h>
 
static inline uint32_t get_available_nvic_line(uint32_t initial_offset)
{
        int i;
 
        for (i = initial_offset - 1; i >= 0; i--) {
 
                if (NVIC_GetEnableIRQ(i) == 0) {
                        /*
                         * Interrupts configured statically with IRQ_CONNECT(.)
                         * are automatically enabled. NVIC_GetEnableIRQ()
                         * returning false, here, implies that the IRQ line is
                         * either not implemented or it is not enabled, thus,
                         * currently not in use by Zephyr.
                         */
 
                        /* Set the NVIC line to pending. */
                        NVIC_SetPendingIRQ(i);
 
                        if (NVIC_GetPendingIRQ(i)) {
                                /*
                                 * If the NVIC line is pending, it is
                                 * guaranteed that it is implemented; clear the
                                 * line.
                                 */
                                NVIC_ClearPendingIRQ(i);
 
                                if (!NVIC_GetPendingIRQ(i)) {
                                        /*
                                         * If the NVIC line can be successfully
                                         * un-pended, it is guaranteed that it
                                         * can be used for software interrupt
                                         * triggering. Return the NVIC line
                                         * number.
                                         */
                                        break;
                                }
                        }
                }
        }
 
        zassert_true(i >= 0, "No available IRQ line\n");
 
        return i;
}
 
static inline void trigger_irq(int irq)
{
        printk("Triggering irq : %d\n", irq);
#if defined(CONFIG_SOC_TI_LM3S6965_QEMU) || defined(CONFIG_CPU_CORTEX_M0) \
        || defined(CONFIG_CPU_CORTEX_M0PLUS) || defined(CONFIG_CPU_CORTEX_M1)\
        || defined(CONFIG_ARMV6_M_ARMV8_M_BASELINE)
        /* QEMU does not simulate the STIR register: this is a workaround */
        NVIC_SetPendingIRQ(irq);
#else
        NVIC->STIR = irq;
#endif
}
 
#elif defined(CONFIG_GIC)
#include <zephyr/drivers/interrupt_controller/gic.h>
#include <zephyr/dt-bindings/interrupt-controller/arm-gic.h>
 
static inline void trigger_irq(int irq)
{
        printk("Triggering irq : %d\n", irq);
 
        /* Ensure that the specified IRQ number is a valid SGI interrupt ID */
        zassert_true(irq <= 15, "%u is not a valid SGI interrupt ID", irq);
 
        /*
         * Generate a software generated interrupt and forward it to the
         * requesting CPU.
         */
#if CONFIG_GIC_VER <= 2
        sys_write32(GICD_SGIR_TGTFILT_REQONLY | GICD_SGIR_SGIINTID(irq),
                    GICD_SGIR);
#else
        uint64_t mpidr = GET_MPIDR();
        uint8_t aff0 = MPIDR_AFFLVL(mpidr, 0);
 
        gic_raise_sgi(irq, mpidr, BIT(aff0));
#endif
}
 
#elif defined(CONFIG_ARC)
static inline void trigger_irq(int irq)
{
        printk("Triggering irq : %d\n", irq);
        z_arc_v2_aux_reg_write(_ARC_V2_AUX_IRQ_HINT, irq);
}
 
#elif defined(CONFIG_X86)
 
#ifdef CONFIG_X2APIC
#include <zephyr/drivers/interrupt_controller/loapic.h>
#define VECTOR_MASK 0xFF
#else
#include <zephyr/sys/arch_interface.h>
#define LOAPIC_ICR_IPI_TEST  0x00004000U
#endif
 
/*
 * We can emulate the interrupt by sending the IPI to
 * core itself by the LOAPIC for x86 platform.
 *
 * In APIC mode, Write LOAPIC's ICR to trigger IPI,
 * the LOAPIC_ICR_IPI_TEST  0x00004000U means:
 * Delivery Mode: Fixed
 * Destination Mode: Physical
 * Level: Assert
 * Trigger Mode: Edge
 * Destination Shorthand: No Shorthand
 * Destination: depends on cpu_id
 *
 * In X2APIC mode, this no longer works. We emulate the
 * interrupt by writing the IA32_X2APIC_SELF_IPI MSR
 * to send IPI to the core itself via LOAPIC also.
 * According to SDM vol.3 chapter 10.12.11, the bit[7:0]
 * for setting the vector is only needed.
 */
static inline void trigger_irq(int vector)
{
        uint8_t i;
 
#ifdef CONFIG_X2APIC
        x86_write_x2apic(LOAPIC_SELF_IPI, ((VECTOR_MASK & vector)));
#else
 
#ifdef CONFIG_SMP
        int cpu_id = arch_curr_cpu()->id;
#else
        int cpu_id = 0;
#endif
        z_loapic_ipi(cpu_id, LOAPIC_ICR_IPI_TEST, vector);
#endif /* CONFIG_X2APIC */
 
        /*
         * add some nop operations here to cost some cycles to make sure
         * the IPI interrupt is handled before do our check.
         */
        for (i = 0; i < 10; i++) {
                arch_nop();
        }
}
 
#elif defined(CONFIG_ARCH_POSIX)
#include <zephyr/arch/posix/posix_soc_if.h>
 
static inline void trigger_irq(int irq)
{
        posix_sw_set_pending_IRQ(irq);
}
 
#elif defined(CONFIG_RISCV)
static inline void trigger_irq(int irq)
{
        uint32_t mip;
 
        __asm__ volatile ("csrrs %0, mip, %1\n"
                          : "=r" (mip)
                          : "r" (1 << irq));
}
 
#elif defined(CONFIG_XTENSA)
static inline void trigger_irq(int irq)
{
        z_xt_set_intset(BIT((unsigned int)irq));
}
 
#elif defined(CONFIG_SPARC)
extern void z_sparc_enter_irq(int);
 
static inline void trigger_irq(int irq)
{
        z_sparc_enter_irq(irq);
}
 
#elif defined(CONFIG_MIPS)
extern void z_mips_enter_irq(int);
 
static inline void trigger_irq(int irq)
{
        z_mips_enter_irq(irq);
}
 
#elif defined(CONFIG_CPU_CORTEX_R5) && defined(CONFIG_VIM)
 
extern void z_vim_arm_enter_irq(int);
 
static inline void trigger_irq(int irq)
{
        z_vim_arm_enter_irq(irq);
}
 
#else
/* So far, Nios II does not support this */
#define NO_TRIGGER_FROM_SW
#endif
 
#endif /* INTERRUPT_UTIL_H_ */