260 lines
6.2 KiB
C
260 lines
6.2 KiB
C
/*
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* Copyright (c) 2016 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_KERNEL_INCLUDE_KERNEL_STRUCTS_H_
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#define ZEPHYR_KERNEL_INCLUDE_KERNEL_STRUCTS_H_
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#include <kernel.h>
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#if !defined(_ASMLANGUAGE)
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#include <sys/atomic.h>
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#include <sys/dlist.h>
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#include <sys/rb.h>
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#include <sys/util.h>
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#include <string.h>
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#endif
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#define K_NUM_PRIORITIES \
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(CONFIG_NUM_COOP_PRIORITIES + CONFIG_NUM_PREEMPT_PRIORITIES + 1)
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#define K_NUM_PRIO_BITMAPS ((K_NUM_PRIORITIES + 31) >> 5)
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/*
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* Bitmask definitions for the struct k_thread.thread_state field.
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*
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* Must be before kerneL_arch_data.h because it might need them to be already
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* defined.
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*/
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/* states: common uses low bits, arch-specific use high bits */
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/* Not a real thread */
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#define _THREAD_DUMMY (BIT(0))
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/* Thread is waiting on an object */
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#define _THREAD_PENDING (BIT(1))
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/* Thread has not yet started */
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#define _THREAD_PRESTART (BIT(2))
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/* Thread has terminated */
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#define _THREAD_DEAD (BIT(3))
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/* Thread is suspended */
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#define _THREAD_SUSPENDED (BIT(4))
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/* Thread is being aborted (SMP only) */
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#define _THREAD_ABORTING (BIT(5))
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/* Thread is present in the ready queue */
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#define _THREAD_QUEUED (BIT(6))
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/* end - states */
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#ifdef CONFIG_STACK_SENTINEL
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/* Magic value in lowest bytes of the stack */
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#define STACK_SENTINEL 0xF0F0F0F0
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#endif
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/* lowest value of _thread_base.preempt at which a thread is non-preemptible */
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#define _NON_PREEMPT_THRESHOLD 0x0080
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/* highest value of _thread_base.preempt at which a thread is preemptible */
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#define _PREEMPT_THRESHOLD (_NON_PREEMPT_THRESHOLD - 1)
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#include <kernel_arch_data.h>
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#if !defined(_ASMLANGUAGE)
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struct _ready_q {
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#ifndef CONFIG_SMP
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/* always contains next thread to run: cannot be NULL */
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struct k_thread *cache;
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#endif
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#if defined(CONFIG_SCHED_DUMB)
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sys_dlist_t runq;
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#elif defined(CONFIG_SCHED_SCALABLE)
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struct _priq_rb runq;
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#elif defined(CONFIG_SCHED_MULTIQ)
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struct _priq_mq runq;
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#endif
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};
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typedef struct _ready_q _ready_q_t;
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struct _cpu {
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/* nested interrupt count */
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u32_t nested;
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/* interrupt stack pointer base */
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char *irq_stack;
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/* currently scheduled thread */
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struct k_thread *current;
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/* one assigned idle thread per CPU */
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struct k_thread *idle_thread;
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#ifdef CONFIG_TIMESLICING
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/* number of ticks remaining in current time slice */
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int slice_ticks;
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#endif
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u8_t id;
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#ifdef CONFIG_SMP
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/* True when _current is allowed to context switch */
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u8_t swap_ok;
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#endif
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};
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typedef struct _cpu _cpu_t;
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struct z_kernel {
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/* For compatibility with pre-SMP code, union the first CPU
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* record with the legacy fields so code can continue to use
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* the "_kernel.XXX" expressions and assembly offsets.
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*/
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union {
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struct _cpu cpus[CONFIG_MP_NUM_CPUS];
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#ifndef CONFIG_SMP
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struct {
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/* nested interrupt count */
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u32_t nested;
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/* interrupt stack pointer base */
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char *irq_stack;
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/* currently scheduled thread */
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struct k_thread *current;
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};
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#endif
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};
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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/* queue of timeouts */
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sys_dlist_t timeout_q;
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#endif
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#ifdef CONFIG_SYS_POWER_MANAGEMENT
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s32_t idle; /* Number of ticks for kernel idling */
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#endif
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/*
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* ready queue: can be big, keep after small fields, since some
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* assembly (e.g. ARC) are limited in the encoding of the offset
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*/
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struct _ready_q ready_q;
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#ifdef CONFIG_FP_SHARING
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/*
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* A 'current_sse' field does not exist in addition to the 'current_fp'
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* field since it's not possible to divide the IA-32 non-integer
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* registers into 2 distinct blocks owned by differing threads. In
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* other words, given that the 'fxnsave/fxrstor' instructions
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* save/restore both the X87 FPU and XMM registers, it's not possible
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* for a thread to only "own" the XMM registers.
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*/
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/* thread that owns the FP regs */
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struct k_thread *current_fp;
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#endif
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#if defined(CONFIG_THREAD_MONITOR)
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struct k_thread *threads; /* singly linked list of ALL threads */
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#endif
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};
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typedef struct z_kernel _kernel_t;
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extern struct z_kernel _kernel;
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#ifdef CONFIG_SMP
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#define _current_cpu (z_arch_curr_cpu())
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#define _current (z_arch_curr_cpu()->current)
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#else
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#define _current_cpu (&_kernel.cpus[0])
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#define _current _kernel.current
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#endif
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#define _timeout_q _kernel.timeout_q
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#include <kernel_arch_func.h>
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#ifdef CONFIG_USE_SWITCH
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/* This is a arch function traditionally, but when the switch-based
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* z_swap() is in use it's a simple inline provided by the kernel.
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*/
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static ALWAYS_INLINE void
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z_set_thread_return_value(struct k_thread *thread, unsigned int value)
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{
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thread->swap_retval = value;
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}
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#endif
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static ALWAYS_INLINE void
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z_set_thread_return_value_with_data(struct k_thread *thread,
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unsigned int value,
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void *data)
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{
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z_set_thread_return_value(thread, value);
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thread->base.swap_data = data;
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}
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extern void z_init_thread_base(struct _thread_base *thread_base,
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int priority, u32_t initial_state,
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unsigned int options);
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static ALWAYS_INLINE void z_new_thread_init(struct k_thread *thread,
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char *pStack, size_t stackSize,
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int prio, unsigned int options)
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{
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#if !defined(CONFIG_INIT_STACKS) && !defined(CONFIG_THREAD_STACK_INFO)
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ARG_UNUSED(pStack);
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ARG_UNUSED(stackSize);
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#endif
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#ifdef CONFIG_INIT_STACKS
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memset(pStack, 0xaa, stackSize);
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#endif
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#ifdef CONFIG_STACK_SENTINEL
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/* Put the stack sentinel at the lowest 4 bytes of the stack area.
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* We periodically check that it's still present and kill the thread
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* if it isn't.
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*/
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*((u32_t *)pStack) = STACK_SENTINEL;
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#endif /* CONFIG_STACK_SENTINEL */
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/* Initialize various struct k_thread members */
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z_init_thread_base(&thread->base, prio, _THREAD_PRESTART, options);
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/* static threads overwrite it afterwards with real value */
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thread->init_data = NULL;
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thread->fn_abort = NULL;
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#ifdef CONFIG_THREAD_CUSTOM_DATA
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/* Initialize custom data field (value is opaque to kernel) */
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thread->custom_data = NULL;
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#endif
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#ifdef CONFIG_THREAD_NAME
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thread->name[0] = '\0';
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#endif
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#if defined(CONFIG_USERSPACE)
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thread->mem_domain_info.mem_domain = NULL;
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#endif /* CONFIG_USERSPACE */
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#if defined(CONFIG_THREAD_STACK_INFO)
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thread->stack_info.start = (uintptr_t)pStack;
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thread->stack_info.size = (u32_t)stackSize;
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#endif /* CONFIG_THREAD_STACK_INFO */
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}
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#endif /* _ASMLANGUAGE */
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#endif /* ZEPHYR_KERNEL_INCLUDE_KERNEL_STRUCTS_H_ */
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