1 /* 2 * ARMv7M NVIC object 3 * 4 * Copyright (c) 2017 Linaro Ltd 5 * Written by Peter Maydell <peter.maydell@linaro.org> 6 * 7 * This code is licensed under the GPL version 2 or later. 8 */ 9 10 #ifndef HW_ARM_ARMV7M_NVIC_H 11 #define HW_ARM_ARMV7M_NVIC_H 12 13 #include "target/arm/cpu.h" 14 #include "hw/sysbus.h" 15 #include "hw/timer/armv7m_systick.h" 16 17 #define TYPE_NVIC "armv7m_nvic" 18 19 #define NVIC(obj) \ 20 OBJECT_CHECK(NVICState, (obj), TYPE_NVIC) 21 22 /* Highest permitted number of exceptions (architectural limit) */ 23 #define NVIC_MAX_VECTORS 512 24 25 typedef struct VecInfo { 26 /* Exception priorities can range from -3 to 255; only the unmodifiable 27 * priority values for RESET, NMI and HardFault can be negative. 28 */ 29 int16_t prio; 30 uint8_t enabled; 31 uint8_t pending; 32 uint8_t active; 33 uint8_t level; /* exceptions <=15 never set level */ 34 } VecInfo; 35 36 typedef struct NVICState { 37 /*< private >*/ 38 SysBusDevice parent_obj; 39 /*< public >*/ 40 41 ARMCPU *cpu; 42 43 VecInfo vectors[NVIC_MAX_VECTORS]; 44 uint32_t prigroup; 45 46 /* vectpending and exception_prio are both cached state that can 47 * be recalculated from the vectors[] array and the prigroup field. 48 */ 49 unsigned int vectpending; /* highest prio pending enabled exception */ 50 int exception_prio; /* group prio of the highest prio active exception */ 51 52 MemoryRegion sysregmem; 53 MemoryRegion container; 54 55 uint32_t num_irq; 56 qemu_irq excpout; 57 qemu_irq sysresetreq; 58 59 SysTickState systick; 60 } NVICState; 61 62 #endif 63