[660db8c8] | 1 | /* |
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| 2 | * |
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| 3 | * Copyright (c) 2015 University of York. |
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| 4 | * Hesham Almatary <hesham@alumni.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 <rtems/score/cpu.h> |
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| 36 | #include <rtems/score/riscv-utility.h> |
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| 37 | |
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| 38 | void _CPU_Context_Initialize( |
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| 39 | Context_Control *context, |
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| 40 | void *stack_area_begin, |
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| 41 | size_t stack_area_size, |
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[11ff3a9] | 42 | unsigned long new_level, |
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[660db8c8] | 43 | void (*entry_point)( void ), |
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| 44 | bool is_fp, |
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| 45 | void *tls_area |
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| 46 | ) |
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| 47 | { |
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| 48 | uintptr_t stack = ((uintptr_t) stack_area_begin); |
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| 49 | |
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[98f051e] | 50 | uintptr_t stack_high = stack + stack_area_size; |
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[660db8c8] | 51 | |
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| 52 | /* Stack Pointer - sp/x2 */ |
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| 53 | context->x[2] = stack_high; |
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| 54 | /* Frame Pointer - fp/x8 */ |
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| 55 | context->x[8] = stack_high; |
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| 56 | /* Return Address - ra/x1 */ |
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| 57 | context->x[1] = (uintptr_t) entry_point; |
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| 58 | |
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[a49a3c8e] | 59 | context->isr_dispatch_disable = 0; |
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| 60 | |
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[660db8c8] | 61 | /* Enable interrupts and FP */ |
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| 62 | context->mstatus = MSTATUS_FS | MSTATUS_MIE; |
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| 63 | } |
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