162 lines
4.5 KiB
C
162 lines
4.5 KiB
C
/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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 nanokernel fiber related primitives for the ARCv2 processor
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* architecture.
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*/
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#include <nanokernel.h>
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#include <toolchain.h>
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#include <nano_private.h>
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#include <offsets.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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tNANO _nanokernel = {0};
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#if defined(CONFIG_THREAD_MONITOR)
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#define THREAD_MONITOR_INIT(tcs) thread_monitor_init(tcs)
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#else
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#define THREAD_MONITOR_INIT(tcs) \
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do {/* do nothing */ \
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} while ((0))
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#endif
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#if defined(CONFIG_THREAD_MONITOR)
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/*
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* @brief Initialize thread monitoring support
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*
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* Currently only inserts the new thread in the list of active threads.
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*
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* @return N/A
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*/
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static ALWAYS_INLINE void thread_monitor_init(struct tcs *tcs)
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{
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unsigned int key;
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/*
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* Add the newly initialized thread to head of the list of threads. This
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* singly linked list of threads maintains ALL the threads in the system:
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* both tasks and fibers regardless of whether they are runnable.
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*/
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key = irq_lock();
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tcs->next_thread = _nanokernel.threads;
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_nanokernel.threads = tcs;
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irq_unlock(key);
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}
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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 control structure (TCS) 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 fiber priority, -1 for task
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* @param options is unused (saved for future expansion)
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*
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* @return N/A
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*/
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void _new_thread(char *pStackMem, unsigned stackSize, _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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char *stackEnd = pStackMem + stackSize;
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struct init_stack_frame *pInitCtx;
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struct tcs *tcs = (struct tcs *) 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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pInitCtx->status32 = _ARC_V2_STATUS32_E(_ARC_V2_DEF_IRQ_LEVEL);
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tcs->link = NULL;
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tcs->flags = priority == -1 ? TASK | PREEMPTIBLE : FIBER;
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tcs->prio = priority;
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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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tcs->custom_data = NULL;
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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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tcs->intlock_key = 0x3F;
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tcs->relinquish_cause = _CAUSE_COOP;
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tcs->preempReg.sp = (uint32_t)pInitCtx - __tCalleeSaved_SIZEOF;
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_nano_timeout_tcs_init(tcs);
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/* initial values in all other registers/TCS entries are irrelevant */
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THREAD_MONITOR_INIT(tcs);
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}
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