CortexM, NVIC not reseted if qemu_system_reset_request() called

[Oleksiy Bondarenko]

qemu 0.15.1

Interrupts does not work anymore if system reseted from interrupt.

There is no reset function registered for armv7m_nvic, and as it is part of the core there is also no any reset for gic/nvic in cpu_reset() for arm.

possible solution is to add reset function to armv7_nvic.c

static void nvic_reset(void *opaque)
{
    nvic_state* s = opaque;
    s->systick.control = 0;
    s->systick.reload = 0;
    s->systick.tick = 0;
    qemu_del_timer(s->systick.timer);
    gic_reset(&s->gic);
}

and register it in armv7m_nvic_init

[Peter Maydell (pmaydell)]

I added a reset function for the NVIC/systick as part of the GIC refactoring work I did recently. These changes should be in QEMU 1.1.