This patch allows to emulate the STM32L4x5 EXTI device.
It implements register access and software interruptions.

This is RFC because we're new at contributing to QEMU.
We had some difficulties writing qtests and the result might be bizarre.

We have some questions about the next steps for our stm32l4x5 project :

Should we send a non-RFC patch after this peripheral implementation is
or should we wait for more peripherals to be implemented?
We have syscfg and uart implementations ongoing.

Also, should the version numbers restart from 1 when sending a non-RFC
tag ?

Inès Varhol

Changes from v2 to v3:
- adding more tests writing/reading in exti registers
- adding tests checking that interrupt work by reading NVIC registers
- correcting exti_write in SWIER (so it sets an irq only when a bit goes
from '0' to '1')
- correcting exti_set_irq (so it never writes in PR when the relevant
bit in IMR is '0')

Changes from v1 to v2:
- use arrays to deduplicate code and logic
- move internal constant EXTI_NUM_GPIO_EVENT_IN_LINES from the header
to the .c file
- Improve copyright headers
- replace static const with #define
- use the DEFINE_TYPES macro
- fill the impl and valid field of the exti's MemoryRegionOps
- fix invalid test caused by a last minute change

Based-on: <>
([RFC v3 2/2] hw/arm: Add minimal support for the B-L475E-IOT01A board)

Inès Varhol (1):
  Implement STM32L4x5 EXTI

 hw/arm/Kconfig                    |   1 +
 hw/arm/stm32l4x5_soc.c            |  65 +++-
 hw/misc/Kconfig                   |   3 +
 hw/misc/               |   1 +
 hw/misc/stm32l4x5_exti.c          | 306 +++++++++++++++++++
 hw/misc/trace-events              |   5 +
 include/hw/arm/stm32l4x5_soc.h    |   3 +
 include/hw/misc/stm32l4x5_exti.h  |  58 ++++
 tests/qtest/           |   5 +
 tests/qtest/stm32l4x5_exti-test.c | 485 ++++++++++++++++++++++++++++++
 10 files changed, 930 insertions(+), 2 deletions(-)
 create mode 100644 hw/misc/stm32l4x5_exti.c
 create mode 100644 include/hw/misc/stm32l4x5_exti.h
 create mode 100644 tests/qtest/stm32l4x5_exti-test.c


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