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8d50457dfc
Most tools used for compliance and SBOM generation use SPDX identifiers This change brings us a step closer to an easy SBOM generation. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
113 lines
3.8 KiB
C
113 lines
3.8 KiB
C
/****************************************************************************
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* arch/xtensa/src/common/xtensa_initialstate.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <string.h>
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#include <nuttx/arch.h>
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#include <arch/irq.h>
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#include <arch/xtensa/core.h>
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#include <arch/chip/core-isa.h>
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#include <arch/xtensa/xtensa_corebits.h>
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#include <arch/xtensa/xtensa_coproc.h>
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#include "xtensa.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_initial_state
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*
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* Description:
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* A new thread is being started and a new TCB has been created. This
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* function is called to initialize the processor specific portions of the
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* new TCB.
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*
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* This function must setup the initial architecture registers and/or stack
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* so that execution will begin at tcb->start on the next context switch.
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*
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****************************************************************************/
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void up_initial_state(struct tcb_s *tcb)
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{
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struct xcptcontext *xcp = &tcb->xcp;
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/* Initialize the initial exception register context structure */
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memset(xcp, 0, sizeof(struct xcptcontext));
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/* Initialize the idle thread stack */
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if (tcb->pid == IDLE_PROCESS_ID)
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{
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tcb->stack_alloc_ptr = g_idlestack;
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tcb->stack_base_ptr = tcb->stack_alloc_ptr;
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tcb->adj_stack_size = CONFIG_IDLETHREAD_STACKSIZE;
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#ifdef CONFIG_STACK_COLORATION
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/* If stack debug is enabled, then fill the stack with a
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* recognizable value that we can use later to test for high
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* water marks.
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*/
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xtensa_stack_color(tcb->stack_alloc_ptr, 0);
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#endif /* CONFIG_STACK_COLORATION */
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return;
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}
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/* Initialize the context registers to stack top */
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xcp->regs = (void *)((uint32_t)tcb->stack_base_ptr +
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tcb->adj_stack_size -
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XCPTCONTEXT_SIZE);
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/* Initialize the xcp registers */
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memset(xcp->regs, 0, XCPTCONTEXT_SIZE);
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/* Set initial values of registers */
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xcp->regs[REG_PC] = (uint32_t)tcb->start; /* Task entrypoint */
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xcp->regs[REG_A0] = 0; /* To terminate GDB backtrace */
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xcp->regs[REG_A1] = (uint32_t)tcb->stack_base_ptr + /* Physical top of stack frame */
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tcb->adj_stack_size;
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/* Set initial PS to int level 0, user mode. */
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#ifdef __XTENSA_CALL0_ABI__
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xcp->regs[REG_PS] = PS_UM;
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#else
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/* For windowed ABI set WOE and CALLINC (pretend task was 'call4'd). */
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xcp->regs[REG_PS] = PS_UM | PS_WOE | PS_CALLINC(1);
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#endif
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}
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