| /* |
| * 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 New thread creation for ARCv2 |
| * |
| * Core nanokernel fiber related primitives for the ARCv2 processor |
| * architecture. |
| */ |
| |
| #include <nanokernel.h> |
| #include <toolchain.h> |
| #include <nano_private.h> |
| #include <offsets.h> |
| #include <wait_q.h> |
| #ifdef CONFIG_INIT_STACKS |
| #include <string.h> |
| #endif /* CONFIG_INIT_STACKS */ |
| /* initial stack frame */ |
| struct init_stack_frame { |
| uint32_t pc; |
| uint32_t status32; |
| uint32_t r3; |
| uint32_t r2; |
| uint32_t r1; |
| uint32_t r0; |
| }; |
| |
| tNANO _nanokernel = {0}; |
| |
| #if defined(CONFIG_THREAD_MONITOR) |
| #define THREAD_MONITOR_INIT(tcs) thread_monitor_init(tcs) |
| #else |
| #define THREAD_MONITOR_INIT(tcs) \ |
| do {/* do nothing */ \ |
| } while ((0)) |
| #endif |
| |
| #if defined(CONFIG_THREAD_MONITOR) |
| /* |
| * @brief Initialize thread monitoring support |
| * |
| * Currently only inserts the new thread in the list of active threads. |
| * |
| * @return N/A |
| */ |
| |
| static ALWAYS_INLINE void thread_monitor_init(struct tcs *tcs) |
| { |
| unsigned int key; |
| |
| /* |
| * Add the newly initialized thread to head of the list of threads. This |
| * singly linked list of threads maintains ALL the threads in the system: |
| * both tasks and fibers regardless of whether they are runnable. |
| */ |
| |
| key = irq_lock(); |
| tcs->next_thread = _nanokernel.threads; |
| _nanokernel.threads = tcs; |
| irq_unlock(key); |
| } |
| #endif /* CONFIG_THREAD_MONITOR */ |
| |
| /* |
| * @brief Initialize a new thread from its stack space |
| * |
| * The control structure (TCS) is put at the lower address of the stack. An |
| * initial context, to be "restored" by __return_from_coop(), is put at |
| * the other end of the stack, and thus reusable by the stack when not |
| * needed anymore. |
| * |
| * The initial context is a basic stack frame that contains arguments for |
| * _thread_entry() return address, that points at _thread_entry() |
| * and status register. |
| * |
| * <options> is currently unused. |
| * |
| * @param pStackmem the pointer to aligned stack memory |
| * @param stackSize the stack size in bytes |
| * @param pEntry thread entry point routine |
| * @param parameter1 first param to entry point |
| * @param parameter2 second param to entry point |
| * @param parameter3 third param to entry point |
| * @param fiber priority, -1 for task |
| * @param options is unused (saved for future expansion) |
| * |
| * @return N/A |
| */ |
| void _new_thread(char *pStackMem, unsigned stackSize, |
| void *uk_task_ptr, _thread_entry_t pEntry, |
| void *parameter1, void *parameter2, void *parameter3, |
| int priority, unsigned options) |
| { |
| char *stackEnd = pStackMem + stackSize; |
| struct init_stack_frame *pInitCtx; |
| |
| struct tcs *tcs = (struct tcs *) pStackMem; |
| |
| #ifdef CONFIG_INIT_STACKS |
| memset(pStackMem, 0xaa, stackSize); |
| #endif |
| |
| /* carve the thread entry struct from the "base" of the stack */ |
| |
| pInitCtx = (struct init_stack_frame *)(STACK_ROUND_DOWN(stackEnd) - |
| sizeof(struct init_stack_frame)); |
| |
| pInitCtx->pc = ((uint32_t)_thread_entry_wrapper); |
| pInitCtx->r0 = (uint32_t)pEntry; |
| pInitCtx->r1 = (uint32_t)parameter1; |
| pInitCtx->r2 = (uint32_t)parameter2; |
| pInitCtx->r3 = (uint32_t)parameter3; |
| /* |
| * For now set the interrupt priority to 15 |
| * we can leave interrupt enable flag set to 0 as |
| * seti instruction in the end of the _Swap() will |
| * enable the interrupts based on intlock_key |
| * value. |
| */ |
| #ifdef CONFIG_ARC_STACK_CHECKING |
| pInitCtx->status32 = _ARC_V2_STATUS32_SC | _ARC_V2_STATUS32_E(_ARC_V2_DEF_IRQ_LEVEL); |
| tcs->stack_top = (uint32_t) stackEnd; |
| #else |
| pInitCtx->status32 = _ARC_V2_STATUS32_E(_ARC_V2_DEF_IRQ_LEVEL); |
| #endif |
| tcs->link = NULL; |
| tcs->flags = priority == -1 ? TASK | PREEMPTIBLE : FIBER; |
| tcs->prio = priority; |
| |
| #ifdef CONFIG_THREAD_CUSTOM_DATA |
| /* Initialize custom data field (value is opaque to kernel) */ |
| |
| tcs->custom_data = NULL; |
| #endif |
| |
| #ifdef CONFIG_THREAD_MONITOR |
| /* |
| * In debug mode tcs->entry give direct access to the thread entry |
| * and the corresponding parameters. |
| */ |
| tcs->entry = (struct __thread_entry *)(pInitCtx); |
| #endif |
| |
| #ifdef CONFIG_MICROKERNEL |
| tcs->uk_task_ptr = uk_task_ptr; |
| #else |
| ARG_UNUSED(uk_task_ptr); |
| #endif |
| |
| /* |
| * intlock_key is constructed based on ARCv2 ISA Programmer's |
| * Reference Manual CLRI instruction description: |
| * dst[31:6] dst[5] dst[4] dst[3:0] |
| * 26'd0 1 STATUS32.IE STATUS32.E[3:0] |
| */ |
| tcs->intlock_key = 0x3F; |
| tcs->relinquish_cause = _CAUSE_COOP; |
| tcs->preempReg.sp = (uint32_t)pInitCtx - __tCalleeSaved_SIZEOF; |
| |
| _nano_timeout_tcs_init(tcs); |
| |
| /* initial values in all other registers/TCS entries are irrelevant */ |
| |
| THREAD_MONITOR_INIT(tcs); |
| } |