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armv7-m: Implement SYSRESETREQ 

Implement the SYSRESETREQ bit of the AIRCR register
for armv7-m (ie. cortex-m3) to trigger a GPIO out.

Signed-off-by: Michael Davidsaver <mdavidsaver@gmail.com>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Michael Davidsaver 2015-11-03 13:49:41 +00:00 committed by Peter Maydell
parent 20c59c3892
commit e192becdc7
1 changed files with 8 additions and 1 deletions
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9
hw/intc/armv7m_nvic.c
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@ -28,6 +28,7 @@ typedef struct {
MemoryRegion gic_iomem_alias;
MemoryRegion container;
uint32_t num_irq;
qemu_irq sysresetreq;
} nvic_state;
#define TYPE_NVIC "armv7m_nvic"
@ -348,10 +349,13 @@ static void nvic_writel(nvic_state *s, uint32_t offset, uint32_t value)
break;
case 0xd0c: /* Application Interrupt/Reset Control. */
if ((value >> 16) == 0x05fa) {
if (value & 4) {
qemu_irq_pulse(s->sysresetreq);
}
if (value & 2) {
qemu_log_mask(LOG_UNIMP, "VECTCLRACTIVE unimplemented\n");
}
if (value & 5) {
if (value & 1) {
qemu_log_mask(LOG_UNIMP, "AIRCR system reset unimplemented\n");
}
if (value & 0x700) {
@ -535,11 +539,14 @@ static void armv7m_nvic_instance_init(Object *obj)
* value in the GICState struct.
*/
GICState *s = ARM_GIC_COMMON(obj);
DeviceState *dev = DEVICE(obj);
nvic_state *nvic = NVIC(obj);
/* The ARM v7m may have anything from 0 to 496 external interrupt
* IRQ lines. We default to 64. Other boards may differ and should
* set the num-irq property appropriately.
*/
s->num_irq = 64;
qdev_init_gpio_out_named(dev, &nvic->sysresetreq, "SYSRESETREQ", 1);
}
static void armv7m_nvic_class_init(ObjectClass *klass, void *data)