forked from Imagelibrary/rtems
bsps: Move start files to bsps
This patch is a part of the BSP source reorganization. Update #3285.
This commit is contained in:
Sebastian Huber
167
bsps/epiphany/epiphany_sim/start/start.S
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167
bsps/epiphany/epiphany_sim/start/start.S
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/*
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* Copyright (c) 2015 University of York.
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* Hesham ALMatary <hmka501@york.ac.uk>
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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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#include <bsp/linker-symbols.h>
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#include <rtems/asm.h>
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EXTERN(bsp_section_bss_begin)
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EXTERN(bsp_section_bss_end)
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EXTERN(_ISR_Handler)
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EXTERN(bsp_start_vector_table_end)
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EXTERN(bsp_start_vector_table_size)
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EXTERN(bsp_vector_table_size)
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EXTERN(bsp_section_stack_begin)
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PUBLIC(_EPIPHANY_Exception_default)
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PUBLIC(bsp_start_vector_table_begin)
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PUBLIC(_start)
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.section .vector, "wax"
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TYPE_FUNC(_start)
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SYM(_start):
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.balign 4 ;
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b .normal_start
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.balign 4 ; 0x4
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b .sw_exception
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.balign 4 ; 0x8
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b .normal_start
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.balign 4 ; 0xc
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b .clock_isr
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.balign 4 ; 0x10
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b .timer1_isr
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.balign 4 ; 0x14
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b _EPIPHANY_Exception_default
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.balign 4 ; 0x18
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b _EPIPHANY_Exception_default
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.balign 4 ; 0x1c
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b _EPIPHANY_Exception_default
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.balign 4 ; 0x20
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b _EPIPHANY_Exception_default
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.balign 4 ; 0x24
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b _EPIPHANY_Exception_default
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bsp_start_vector_table_begin:
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.word .normal_start /* Reset */
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.word _EPIPHANY_Exception_default /* SW exception */
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.word _EPIPHANY_Exception_default /* Data Page Fault */
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.word _EPIPHANY_Exception_default /* Timer 0 */
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.word _EPIPHANY_Exception_default /* Timer 1 */
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.word _EPIPHANY_Exception_default /* Message int */
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.word _EPIPHANY_Exception_default /* DMA0 int */
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.word _EPIPHANY_Exception_default /* DMA1 int */
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.word _EPIPHANY_Exception_default /* WAND */
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.word _EPIPHANY_Exception_default /* User interrupt */
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_bsp_start_vector_table_end:
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.size _start, .-_start
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.section .start,"ax"
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.align 4
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.type _external_start, %function
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.normal_start:
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/* Initialize the stack and frame pointers */
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mov sp, %low(bsp_section_stack_begin)
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movt sp, %high(bsp_section_stack_begin)
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mov fp, sp
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cpu0:
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/* Zero .bss section */
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mov r0, %low(bsp_section_bss_begin)
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movt r0, %high(bsp_section_bss_begin)
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mov r1, sp
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mov r2,#0
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mov r3,#0
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_bss_clear_loop:
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strd r2, [r0], +#1
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sub r5, r1, r0
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bne _bss_clear_loop
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/* Clear the reset interrupt flag */
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mov r0, %low(_jump_to_c)
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movt r0, %high(_jump_to_c)
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movts iret, r0
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rti
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_jump_to_c:
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/* Jump to bootcard */
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mov r3, %low(boot_card)
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movt r3, %high(boot_card)
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jalr r3
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/* Should never reach here */
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idle
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.size .normal_start, .-.normal_start
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.balign 4
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.type .sw_exception, %function
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.sw_exception:
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idle
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.balign 4
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.type .clock_isr, %function
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.clock_isr:
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/*
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* r62 and r63 are saved here, and restored from _ISR_Handler, they
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* and hold vector number and _ISR_Handler address repsectively.
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*/
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add sp, sp, #-8
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str r62, [sp, #0]
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str r63, [sp, #4]
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mov r62, 3
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mov r63, %low(_ISR_Handler)
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movt r63, %high(_ISR_Handler)
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jr r6
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.balign 4
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.type .timer1_isr, %function
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.timer1_isr:
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/*
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* r62 and r63 are saved here, and restored from _ISR_Handler, they
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* and hold vector number and _ISR_Handler address repsectively.
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*/
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add sp, sp, #-8
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str r62, [sp, 0]
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str r63, [sp, 4]
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mov r62, 4
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mov r63, %low(_ISR_Handler)
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movt r63, %high(_ISR_Handler)
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jr r63
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.balign 4
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TYPE_FUNC(_EPIPHANY_Exception_default)
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SYM(_EPIPHANY_Exception_default):
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idle
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