151 lines
4.1 KiB
C
151 lines
4.1 KiB
C
/*
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* Copyright (c) 2014 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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* @file
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* @brief New thread creation for ARCv2
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*
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* Core thread related primitives for the ARCv2 processor architecture.
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*/
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#include <kernel.h>
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#include <toolchain.h>
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#include <kernel_structs.h>
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#include <offsets_short.h>
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#include <wait_q.h>
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#ifdef CONFIG_INIT_STACKS
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#include <string.h>
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#endif /* CONFIG_INIT_STACKS */
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/* initial stack frame */
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struct init_stack_frame {
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uint32_t pc;
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uint32_t status32;
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uint32_t r3;
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uint32_t r2;
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uint32_t r1;
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uint32_t r0;
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};
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#if defined(CONFIG_THREAD_MONITOR)
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/*
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* Add a thread to the kernel's list of active threads.
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*/
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static ALWAYS_INLINE void thread_monitor_init(struct k_thread *thread)
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{
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unsigned int key;
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key = irq_lock();
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thread->next_thread = _kernel.threads;
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_kernel.threads = thread;
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irq_unlock(key);
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}
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#else
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#define thread_monitor_init(thread) \
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do {/* do nothing */ \
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} while ((0))
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#endif /* CONFIG_THREAD_MONITOR */
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/*
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* @brief Initialize a new thread from its stack space
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*
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* The thread control structure is put at the lower address of the stack. An
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* initial context, to be "restored" by __return_from_coop(), is put at
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* the other end of the stack, and thus reusable by the stack when not
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* needed anymore.
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*
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* The initial context is a basic stack frame that contains arguments for
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* _thread_entry() return address, that points at _thread_entry()
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* and status register.
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*
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* <options> is currently unused.
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*
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* @param pStackmem the pointer to aligned stack memory
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* @param stackSize the stack size in bytes
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* @param pEntry thread entry point routine
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* @param parameter1 first param to entry point
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* @param parameter2 second param to entry point
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* @param parameter3 third param to entry point
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* @param priority thread priority
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* @param options thread options: K_ESSENTIAL
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*
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* @return N/A
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*/
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void _new_thread(char *pStackMem, size_t stackSize,
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_thread_entry_t pEntry,
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void *parameter1, void *parameter2, void *parameter3,
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int priority, unsigned options)
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{
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_ASSERT_VALID_PRIO(priority, pEntry);
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char *stackEnd = pStackMem + stackSize;
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struct init_stack_frame *pInitCtx;
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struct k_thread *thread = (struct k_thread *) pStackMem;
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#ifdef CONFIG_INIT_STACKS
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memset(pStackMem, 0xaa, stackSize);
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#endif
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/* carve the thread entry struct from the "base" of the stack */
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pInitCtx = (struct init_stack_frame *)(STACK_ROUND_DOWN(stackEnd) -
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sizeof(struct init_stack_frame));
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pInitCtx->pc = ((uint32_t)_thread_entry_wrapper);
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pInitCtx->r0 = (uint32_t)pEntry;
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pInitCtx->r1 = (uint32_t)parameter1;
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pInitCtx->r2 = (uint32_t)parameter2;
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pInitCtx->r3 = (uint32_t)parameter3;
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/*
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* For now set the interrupt priority to 15
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* we can leave interrupt enable flag set to 0 as
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* seti instruction in the end of the _Swap() will
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* enable the interrupts based on intlock_key
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* value.
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*/
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#ifdef CONFIG_ARC_STACK_CHECKING
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pInitCtx->status32 = _ARC_V2_STATUS32_SC | _ARC_V2_STATUS32_E(_ARC_V2_DEF_IRQ_LEVEL);
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thread->arch.stack_top = (uint32_t) stackEnd;
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#else
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pInitCtx->status32 = _ARC_V2_STATUS32_E(_ARC_V2_DEF_IRQ_LEVEL);
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#endif
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_init_thread_base(&thread->base, priority, K_PRESTART, options);
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/* static threads overwrite them afterwards with real values */
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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_MONITOR
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/*
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* In debug mode thread->entry give direct access to the thread entry
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* and the corresponding parameters.
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*/
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thread->entry = (struct __thread_entry *)(pInitCtx);
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#endif
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/*
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* intlock_key is constructed based on ARCv2 ISA Programmer's
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* Reference Manual CLRI instruction description:
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* dst[31:6] dst[5] dst[4] dst[3:0]
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* 26'd0 1 STATUS32.IE STATUS32.E[3:0]
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*/
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thread->arch.intlock_key = 0x3F;
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thread->arch.relinquish_cause = _CAUSE_COOP;
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thread->callee_saved.sp =
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(uint32_t)pInitCtx - ___callee_saved_stack_t_SIZEOF;
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/* initial values in all other regs/k_thread entries are irrelevant */
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thread_monitor_init(thread);
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}
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