255 lines
5.7 KiB
C
255 lines
5.7 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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/*
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* The purpose of this file is to provide essential/minimal kernel structure
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* definitions, so that they can be used without including kernel.h.
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*
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* The following rules must be observed:
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* 1. kernel_structs.h shall not depend on kernel.h both directly and
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* indirectly (i.e. it shall not include any header files that include
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* kernel.h in their dependency chain).
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* 2. kernel.h shall imply kernel_structs.h, such that it shall not be
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* necessary to include kernel_structs.h explicitly when kernel.h is
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* included.
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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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#if !defined(_ASMLANGUAGE)
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#include <sys/atomic.h>
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#include <zephyr/types.h>
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#include <kernel/sched_priq.h>
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#include <sys/dlist.h>
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#include <sys/util.h>
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#include <sys/sys_heap.h>
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#include <arch/structs.h>
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#include <kernel/stats.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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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 */
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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(7))
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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 0x0080U
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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 - 1U)
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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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uint32_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_SCHED_CPU_MASK_PIN_ONLY
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struct _ready_q ready_q;
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#endif
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#if (CONFIG_NUM_METAIRQ_PRIORITIES > 0) && (CONFIG_NUM_COOP_PRIORITIES > 0)
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/* Coop thread preempted by current metairq, or NULL */
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struct k_thread *metairq_preempted;
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#endif
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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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uint8_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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uint8_t swap_ok;
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#endif
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#ifdef CONFIG_SCHED_THREAD_USAGE
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/*
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* [usage0] is used as a timestamp to mark the beginning of an
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* execution window. [0] is a special value indicating that it
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* has been stopped (but not disabled).
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*/
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uint32_t usage0;
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#ifdef CONFIG_SCHED_THREAD_USAGE_ALL
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struct k_cycle_stats usage;
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#endif
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#endif
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/* Per CPU architecture specifics */
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struct _cpu_arch arch;
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};
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typedef struct _cpu _cpu_t;
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struct z_kernel {
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struct _cpu cpus[CONFIG_MP_NUM_CPUS];
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#ifdef CONFIG_PM
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int32_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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#ifndef CONFIG_SCHED_CPU_MASK_PIN_ONLY
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struct _ready_q ready_q;
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#endif
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#ifdef CONFIG_FPU_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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/* True if the current context can be preempted and migrated to
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* another SMP CPU.
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*/
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bool z_smp_cpu_mobile(void);
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#define _current_cpu ({ __ASSERT_NO_MSG(!z_smp_cpu_mobile()); \
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arch_curr_cpu(); })
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#define _current z_current_get()
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#else
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#define _current_cpu (&_kernel.cpus[0])
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#define _current _kernel.cpus[0].current
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#endif
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/* kernel wait queue record */
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#ifdef CONFIG_WAITQ_SCALABLE
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typedef struct {
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struct _priq_rb waitq;
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} _wait_q_t;
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extern bool z_priq_rb_lessthan(struct rbnode *a, struct rbnode *b);
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#define Z_WAIT_Q_INIT(wait_q) { { { .lessthan_fn = z_priq_rb_lessthan } } }
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#else
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typedef struct {
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sys_dlist_t waitq;
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} _wait_q_t;
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#define Z_WAIT_Q_INIT(wait_q) { SYS_DLIST_STATIC_INIT(&(wait_q)->waitq) }
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#endif
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/* kernel timeout record */
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struct _timeout;
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typedef void (*_timeout_func_t)(struct _timeout *t);
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struct _timeout {
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sys_dnode_t node;
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_timeout_func_t fn;
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#ifdef CONFIG_TIMEOUT_64BIT
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/* Can't use k_ticks_t for header dependency reasons */
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int64_t dticks;
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#else
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int32_t dticks;
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#endif
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};
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typedef void (*k_thread_timeslice_fn_t)(struct k_thread *thread, void *data);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ASMLANGUAGE */
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#endif /* ZEPHYR_KERNEL_INCLUDE_KERNEL_STRUCTS_H_ */
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