/* * Copyright (c) 2014 Wind River Systems, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /** * @file * @brief Private nanokernel definitions * * This file contains private nanokernel structures definitions and various * other definitions for the ARCv2 processor architecture. * * This file is also included by assembly language files which must #define * _ASMLANGUAGE before including this header file. Note that nanokernel * assembly source files obtains structure offset values via "absolute * symbols" in the offsets.o module. */ #ifndef _NANO_PRIVATE_H #define _NANO_PRIVATE_H #ifdef __cplusplus extern "C" { #endif #include #include #include #include #ifndef _ASMLANGUAGE #include /* public nanokernel API */ #include <../../../kernel/nanokernel/include/nano_internal.h> #include #include #include #endif #ifndef _ASMLANGUAGE struct coop { /* * Saved on the stack as part of handling a regular IRQ or by the kernel * when calling the FIRQ return code. */ }; struct irq_stack_frame { uint32_t r0; uint32_t r1; uint32_t r2; uint32_t r3; uint32_t r4; uint32_t r5; uint32_t r6; uint32_t r7; uint32_t r8; uint32_t r9; uint32_t r10; uint32_t r11; uint32_t r12; uint32_t r13; uint32_t blink; uint32_t lp_end; uint32_t lp_start; uint32_t lp_count; #ifdef CONFIG_CODE_DENSITY /* * Currently unsupported. This is where those registers are automatically * pushed on the stack by the CPU when taking a regular IRQ. */ uint32_t ei_base; uint32_t ldi_base; uint32_t jli_base; #endif uint32_t pc; uint32_t status32; }; typedef struct irq_stack_frame tISF; struct preempt { uint32_t sp; /* r28 */ }; typedef struct preempt tPreempt; struct callee_saved { uint32_t r13; uint32_t r14; uint32_t r15; uint32_t r16; uint32_t r17; uint32_t r18; uint32_t r19; uint32_t r20; uint32_t r21; uint32_t r22; uint32_t r23; uint32_t r24; uint32_t r25; uint32_t r26; uint32_t fp; /* r27 */ /* r28 is the stack pointer and saved separately */ /* r29 is ILINK and does not need to be saved */ uint32_t r30; /* * No need to save r31 (blink), it's either alread pushed as the pc or * blink on an irq stack frame. */ }; typedef struct callee_saved tCalleeSaved; /* registers saved by software when taking a FIRQ */ struct firq_regs { uint32_t lp_count; uint32_t lp_start; uint32_t lp_end; }; typedef struct firq_regs tFirqRegs; #endif /* _ASMLANGUAGE */ /* Bitmask definitions for the struct tcs->flags bit field */ #define FIBER 0x000 #define TASK 0x001 /* 1 = task, 0 = fiber */ #define INT_ACTIVE 0x002 /* 1 = execution context is interrupt handler */ #define EXC_ACTIVE 0x004 /* 1 = executino context is exception handler */ #define USE_FP 0x010 /* 1 = thread uses floating point unit */ #define PREEMPTIBLE 0x020 /* 1 = preemptible thread */ #define ESSENTIAL 0x200 /* 1 = system thread that must not abort */ #define NO_METRICS 0x400 /* 1 = _Swap() not to update task metrics */ /* stacks */ #define STACK_ALIGN_SIZE 4 #define STACK_ROUND_UP(x) ROUND_UP(x, STACK_ALIGN_SIZE) #define STACK_ROUND_DOWN(x) ROUND_DOWN(x, STACK_ALIGN_SIZE) /* * Reason a thread has relinquished control: fibers can only be in the NONE * or COOP state, tasks can be one in the four. */ #define _CAUSE_NONE 0 #define _CAUSE_COOP 1 #define _CAUSE_RIRQ 2 #define _CAUSE_FIRQ 3 #ifndef _ASMLANGUAGE struct tcs { struct tcs *link; /* node in singly-linked list * _nanokernel.fibers */ uint32_t flags; /* bitmask of flags above */ uint32_t intlock_key; /* interrupt key when relinquishing control */ int relinquish_cause; /* one of the _CAUSE_xxxx definitions above */ unsigned int return_value;/* return value from _Swap */ int prio; /* fiber priority, -1 for a task */ #ifdef CONFIG_THREAD_CUSTOM_DATA void *custom_data; /* available for custom use */ #endif struct coop coopReg; struct preempt preempReg; #ifdef CONFIG_THREAD_MONITOR struct tcs *next_thread; /* next item in list of ALL fiber+tasks */ #endif #ifdef CONFIG_NANO_TIMEOUTS struct _nano_timeout nano_timeout; #endif #ifdef CONFIG_ERRNO int errno_var; #endif }; struct s_NANO { struct tcs *fiber; /* singly linked list of runnable fibers */ struct tcs *task; /* current task the nanokernel knows about */ struct tcs *current; /* currently scheduled thread (fiber or task) */ #ifdef CONFIG_THREAD_MONITOR struct tcs *threads; /* singly linked list of ALL fiber+tasks */ #endif #ifdef CONFIG_FP_SHARING struct tcs *current_fp; /* thread (fiber or task) that owns the FP regs */ #endif #ifdef CONFIG_ADVANCED_POWER_MANAGEMENT int32_t idle; /* Number of ticks for kernel idling */ #endif char *rirq_sp; /* regular IRQ stack pointer base */ /* * FIRQ stack pointer is installed once in the second bank's SP, so * there is no need to track it in _nanokernel. */ struct firq_regs firq_regs; #ifdef CONFIG_NANO_TIMEOUTS sys_dlist_t timeout_q; #endif }; typedef struct s_NANO tNANO; extern tNANO _nanokernel; #ifdef CONFIG_CPU_ARCV2 #include #include #endif static ALWAYS_INLINE void nanoArchInit(void) { _icache_setup(); _irq_setup(); } /** * * @brief Set the return value for the specified fiber (inline) * * The register used to store the return value from a function call invocation * to . It is assumed that the specified is pending, and thus * the fiber's thread is stored in its struct tcs structure. * * @return N/A */ static ALWAYS_INLINE void fiberRtnValueSet(struct tcs *fiber, unsigned int value) { fiber->return_value = value; } /** * * @brief Indicates if kernel is handling interrupt * * @return 1 if interrupt handler is executed, 0 otherwise */ static ALWAYS_INLINE int _IS_IN_ISR(void) { uint32_t act = _arc_v2_aux_reg_read(_ARC_V2_AUX_IRQ_ACT); #if CONFIG_IRQ_OFFLOAD /* Check if we're in a TRAP_S exception as well */ if (_arc_v2_aux_reg_read(_ARC_V2_STATUS32) & _ARC_V2_STATUS32_AE && _ARC_V2_ECR_VECTOR(_arc_v2_aux_reg_read(_ARC_V2_ECR)) == EXC_EV_TRAP) { return 1; } #endif return ((act & 0xffff) != 0); } extern void nanoCpuAtomicIdle(unsigned int); extern void _thread_entry_wrapper(void); static inline void _IntLibInit(void) { /* nothing needed, here because the kernel requires it */ } #endif /* _ASMLANGUAGE */ #ifdef __cplusplus } #endif #endif /* _NANO_PRIVATE_H */