From fbcd7c8fa65eb695e96a62ea1c1ac7a024fa9dfc Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Fri, 20 Apr 2018 10:19:28 +0200 Subject: bsps: Move start files to bsps This patch is a part of the BSP source reorganization. Update #3285. --- bsps/riscv/riscv_generic/start/start.S | 120 +++++++++++++++++++++++++++++++++ 1 file changed, 120 insertions(+) create mode 100644 bsps/riscv/riscv_generic/start/start.S (limited to 'bsps/riscv') diff --git a/bsps/riscv/riscv_generic/start/start.S b/bsps/riscv/riscv_generic/start/start.S new file mode 100644 index 0000000000..ccefb818bd --- /dev/null +++ b/bsps/riscv/riscv_generic/start/start.S @@ -0,0 +1,120 @@ +/* + * Copyright (c) 2015 University of York. + * Hesham Almatary + * + * Copyright (c) 2013, The Regents of the University of California (Regents). + * All Rights Reserved. + * + * 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 +#include +#include +#include + +EXTERN(bsp_section_bss_begin) +EXTERN(bsp_section_bss_end) +EXTERN(ISR_Handler) +EXTERN(bsp_start_vector_table_size) +EXTERN(bsp_vector_table_size) +EXTERN(bsp_section_stack_begin) + +PUBLIC(bsp_start_vector_table_begin) +PUBLIC(bsp_start_vector_table_end) +PUBLIC(_start) + +.section .start, "wax" +TYPE_FUNC(_start) +SYM(_start): + li x2, 0 + li x3, 0 + li x4, 0 + li x5, 0 + li x6, 0 + li x7, 0 + li x8, 0 + li x9, 0 + li x10, 0 + li x11, 0 + li x12, 0 + li x13, 0 + li x14, 0 + li x15, 0 + li x16, 0 + li x17, 0 + li x18, 0 + li x19, 0 + li x20, 0 + li x21, 0 + li x22, 0 + li x23, 0 + li x24, 0 + li x25, 0 + li x26, 0 + li x27, 0 + li x28, 0 + li x29, 0 + li x30, 0 + li x31, 0 + + la t0, ISR_Handler + csrw mtvec, t0 + + /* load stack and frame pointers */ + la sp, bsp_section_stack_begin + + /* Clearing .bss */ + la t0, bsp_section_bss_begin + la t1, bsp_section_bss_end + +_loop_clear_bss: + bge t0, t1, _end_clear_bss + SREG x0, 0(t0) + addi t0, t0, CPU_SIZEOF_POINTER + j _loop_clear_bss +_end_clear_bss: + + /* Init FPU unit if it's there */ + li t0, MSTATUS_FS + csrs mstatus, t0 + + j boot_card + + .align 4 +bsp_start_vector_table_begin: + .word _RISCV_Exception_default /* User int */ + .word _RISCV_Exception_default /* Supervisor int */ + .word _RISCV_Exception_default /* Reserved */ + .word _RISCV_Exception_default /* Machine int */ + .word _RISCV_Exception_default /* User timer int */ + .word _RISCV_Exception_default /* Supervisor Timer int */ + .word _RISCV_Exception_default /* Reserved */ + .word _RISCV_Exception_default /* Machine Timer int */ + .word _RISCV_Exception_default /* User external int */ + .word _RISCV_Exception_default /* Supervisor external int */ + .word _RISCV_Exception_default /* Reserved */ + .word _RISCV_Exception_default /* Machine external int */ + .word _RISCV_Exception_default + .word _RISCV_Exception_default + .word _RISCV_Exception_default + .word _RISCV_Exception_default +bsp_start_vector_table_end: -- cgit v1.2.3