ff68dacbc7
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>
63 lines
1.5 KiB
C
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
|