forked from Imagelibrary/rtems
11ff3a9e72
* Use #ifdefs for 32/64 bit code * Use unsigned long which is 32-bit on riscv32 and 64-bit on riscv64 (register size) * Move the code to a new shared riscv folder to be shared between riscv32 and riscv64 * Rename RTEMS_CPU extracted from command line to shared riscv target s/riscv*/riscv Update #3109
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/*
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*
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* Copyright (c) 2015 University of York.
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* Hesham Almatary <hesham@alumni.york.ac.uk>
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*
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* COPYRIGHT (c) 1989-2006.
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* On-Line Applications Research Corporation (OAR).
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <rtems/score/cpu.h>
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#include <rtems/score/riscv-utility.h>
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#include <rtems/score/interr.h>
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void _CPU_Context_Initialize(
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Context_Control *context,
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void *stack_area_begin,
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size_t stack_area_size,
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unsigned long new_level,
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void (*entry_point)( void ),
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bool is_fp,
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void *tls_area
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)
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{
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uintptr_t stack = ((uintptr_t) stack_area_begin);
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/* Account for red-zone */
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uintptr_t stack_high = stack + stack_area_size - RISCV_GCC_RED_ZONE_SIZE;
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memset(context, 0, sizeof(*context));
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/* Stack Pointer - sp/x2 */
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context->x[2] = stack_high;
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/* Frame Pointer - fp/x8 */
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context->x[8] = stack_high;
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/* Return Address - ra/x1 */
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context->x[1] = (uintptr_t) entry_point;
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/* Enable interrupts and FP */
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context->mstatus = MSTATUS_FS | MSTATUS_MIE;
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}
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