113 lines
4.2 KiB
C
113 lines
4.2 KiB
C
/****************************************************************************
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* arch/xtensa/src/common/xtensa_initialstate.c
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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/* 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->adj_stack_ptr; /* Physical top of stack frame */
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/* Set initial PS to int level 0, EXCM disabled ('rfe' will enable), user
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* mode.
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*/
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#ifdef __XTENSA_CALL0_ABI__
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xcp->regs[REG_PS] = PS_UM | PS_EXCM;
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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_EXCM | PS_WOE | PS_CALLINC(1);
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#endif
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#if XCHAL_CP_NUM > 0
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/* Set up the co-processors that will be enabled initially when the thread
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* starts (see xtensa_coproc.h). If the lazy co-processor state restore
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* logic is selected, that would be the empty set.
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*/
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#ifdef CONFIG_XTENSA_CP_LAZY
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xcp->cpstate.cpenable = 0; /* No co-processors are enabled */
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#else
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xcp->cpstate.cpenable = (CONFIG_XTENSA_CP_INITSET & XTENSA_CP_ALLSET);
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#endif
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xcp->cpstate.cpstored = 0; /* No co-processors haved state saved */
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#endif
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}
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