[66a5000d] | 1 | /* |
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| 2 | * |
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| 3 | * Copyright (c) 2015 University of York. |
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| 4 | * Hesham ALMatary <hmka501@york.ac.uk> |
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| 5 | * |
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| 6 | * COPYRIGHT (c) 1989-2006. |
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| 7 | * On-Line Applications Research Corporation (OAR). |
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| 8 | * |
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| 9 | * Redistribution and use in source and binary forms, with or without |
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| 10 | * modification, are permitted provided that the following conditions |
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| 11 | * are met: |
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| 12 | * 1. Redistributions of source code must retain the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer. |
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| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 15 | * notice, this list of conditions and the following disclaimer in the |
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| 16 | * documentation and/or other materials provided with the distribution. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 28 | * SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |
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| 31 | #ifdef HAVE_CONFIG_H |
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| 32 | #include "config.h" |
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| 33 | #endif |
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| 34 | |
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| 35 | #include <string.h> |
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| 36 | |
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| 37 | #include <rtems/score/cpu.h> |
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| 38 | #include <rtems/score/interr.h> |
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| 39 | |
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| 40 | void _CPU_Context_Initialize( |
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| 41 | Context_Control *context, |
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| 42 | void *stack_area_begin, |
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| 43 | size_t stack_area_size, |
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| 44 | uint32_t new_level, |
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| 45 | void (*entry_point)( void ), |
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| 46 | bool is_fp, |
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| 47 | void *tls_area |
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| 48 | ) |
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| 49 | { |
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| 50 | uintptr_t stack = ((uintptr_t) stack_area_begin); |
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| 51 | uint32_t sr, iret; |
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| 52 | |
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| 53 | /* Account for red-zone */ |
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| 54 | uintptr_t stack_high = stack + stack_area_size - EPIPHANY_GCC_RED_ZONE_SIZE; |
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| 55 | |
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| 56 | asm volatile ("movfs %0, status \n" : "=r" (sr):); |
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| 57 | asm volatile ("movfs %0, iret \n" : "=r" (iret):); |
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| 58 | |
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| 59 | memset(context, 0, sizeof(*context)); |
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| 60 | |
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| 61 | context->r[11] = stack_high; |
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| 62 | context->r[13] = stack_high; |
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| 63 | context->r[14] = (uintptr_t) entry_point; |
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| 64 | context->status = sr; |
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| 65 | context->iret = iret; |
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| 66 | } |
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