/*
* Copyright (c) 2015 University of York.
* Hesham ALMatary <hmka501@york.ac.uk>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <bsp/linker-symbols.h>
#include <rtems/asm.h>
EXTERN(bsp_section_bss_begin)
EXTERN(bsp_section_bss_end)
EXTERN(_ISR_Handler)
EXTERN(bsp_start_vector_table_end)
EXTERN(bsp_start_vector_table_size)
EXTERN(bsp_vector_table_size)
EXTERN(bsp_section_stack_begin)
PUBLIC(_EPIPHANY_Exception_default)
PUBLIC(bsp_start_vector_table_begin)
PUBLIC(_start)
.section .vector, "wax"
TYPE_FUNC(_start)
SYM(_start):
.balign 4 ;
b .normal_start
.balign 4 ; 0x4
b .sw_exception
.balign 4 ; 0x8
b .normal_start
.balign 4 ; 0xc
b .clock_isr
.balign 4 ; 0x10
b .timer1_isr
.balign 4 ; 0x14
b _EPIPHANY_Exception_default
.balign 4 ; 0x18
b _EPIPHANY_Exception_default
.balign 4 ; 0x1c
b _EPIPHANY_Exception_default
.balign 4 ; 0x20
b _EPIPHANY_Exception_default
.balign 4 ; 0x24
b _EPIPHANY_Exception_default
bsp_start_vector_table_begin:
.word .normal_start /* Reset */
.word _EPIPHANY_Exception_default /* SW exception */
.word _EPIPHANY_Exception_default /* Data Page Fault */
.word _EPIPHANY_Exception_default /* Timer 0 */
.word _EPIPHANY_Exception_default /* Timer 1 */
.word _EPIPHANY_Exception_default /* Message int */
.word _EPIPHANY_Exception_default /* DMA0 int */
.word _EPIPHANY_Exception_default /* DMA1 int */
.word _EPIPHANY_Exception_default /* WAND */
.word _EPIPHANY_Exception_default /* User interrupt */
_bsp_start_vector_table_end:
.size _start, .-_start
.section .start,"ax"
.align 4
.type _external_start, %function
.normal_start:
/* Initialize the stack and frame pointers */
mov sp, %low(bsp_section_stack_begin)
movt sp, %high(bsp_section_stack_begin)
mov fp, sp
cpu0:
/* Zero .bss section */
mov r0, %low(bsp_section_bss_begin)
movt r0, %high(bsp_section_bss_begin)
mov r1, sp
mov r2,#0
mov r3,#0
_bss_clear_loop:
strd r2, [r0], +#1
sub r5, r1, r0
bne _bss_clear_loop
/* Clear the reset interrupt flag */
mov r0, %low(_jump_to_c)
movt r0, %high(_jump_to_c)
movts iret, r0
rti
_jump_to_c:
/* Jump to bootcard */
mov r3, %low(boot_card)
movt r3, %high(boot_card)
jalr r3
/* Should never reach here */
idle
.size .normal_start, .-.normal_start
.balign 4
.type .sw_exception, %function
.sw_exception:
idle
.balign 4
.type .clock_isr, %function
.clock_isr:
/*
* r62 and r63 are saved here, and restored from _ISR_Handler, they
* and hold vector number and _ISR_Handler address repsectively.
*/
add sp, sp, #-8
str r62, [sp, #0]
str r63, [sp, #4]
mov r62, 3
mov r63, %low(_ISR_Handler)
movt r63, %high(_ISR_Handler)
jr r6
.balign 4
.type .timer1_isr, %function
.timer1_isr:
/*
* r62 and r63 are saved here, and restored from _ISR_Handler, they
* and hold vector number and _ISR_Handler address repsectively.
*/
add sp, sp, #-8
str r62, [sp, 0]
str r63, [sp, 4]
mov r62, 4
mov r63, %low(_ISR_Handler)
movt r63, %high(_ISR_Handler)
jr r63
.balign 4
TYPE_FUNC(_EPIPHANY_Exception_default)
SYM(_EPIPHANY_Exception_default):
idle
