qemu/include/hw/arm/armv7m_nvic.h
Peter Maydell ff68dacbc7 armv7m: Split systick out from NVIC
The SysTick timer isn't really part of the NVIC proper;
we just modelled it that way back when we couldn't
easily have devices that only occupied a small chunk
of a memory region. Split it out into its own device.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1487604965-23220-10-git-send-email-peter.maydell@linaro.org
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
2017-02-28 16:18:49 +00:00

63 lines
1.5 KiB
C

/*
* ARMv7M NVIC object
*
* Copyright (c) 2017 Linaro Ltd
* Written by Peter Maydell <peter.maydell@linaro.org>
*
* This code is licensed under the GPL version 2 or later.
*/
#ifndef HW_ARM_ARMV7M_NVIC_H
#define HW_ARM_ARMV7M_NVIC_H
#include "target/arm/cpu.h"
#include "hw/sysbus.h"
#include "hw/timer/armv7m_systick.h"
#define TYPE_NVIC "armv7m_nvic"
#define NVIC(obj) \
OBJECT_CHECK(NVICState, (obj), TYPE_NVIC)
/* Highest permitted number of exceptions (architectural limit) */
#define NVIC_MAX_VECTORS 512
typedef struct VecInfo {
/* Exception priorities can range from -3 to 255; only the unmodifiable
* priority values for RESET, NMI and HardFault can be negative.
*/
int16_t prio;
uint8_t enabled;
uint8_t pending;
uint8_t active;
uint8_t level; /* exceptions <=15 never set level */
} VecInfo;
typedef struct NVICState {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
ARMCPU *cpu;
VecInfo vectors[NVIC_MAX_VECTORS];
uint32_t prigroup;
/* vectpending and exception_prio are both cached state that can
* be recalculated from the vectors[] array and the prigroup field.
*/
unsigned int vectpending; /* highest prio pending enabled exception */
int exception_prio; /* group prio of the highest prio active exception */
MemoryRegion sysregmem;
MemoryRegion container;
uint32_t num_irq;
qemu_irq excpout;
qemu_irq sysresetreq;
SysTickState systick;
} NVICState;
#endif