134 lines
2.3 KiB
ArmAsm
134 lines
2.3 KiB
ArmAsm
// See LICENSE for license details.
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/**
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* @file boot.S
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* @brief hifive1-rev-B-board start function
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* @version 1.0
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* @author AIIT XUOS Lab
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* @date 2021-04-25
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*/
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/*************************************************
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File name: boot.S
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Description: hifive1-rev-B-board start function
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Others: take freedom-e-sdk v20180402/bsp/env/start.S for references
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https://github.com/sifive/freedom-e-sdk/releases/tag/v20180402
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History:
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1. Date: 2021-04-25
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Author: AIIT XUOS Lab
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Modification:
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1. See LICENSE details in xiuos/arch/risc-v/fe310/LICENSE
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2. Modify entry function name
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3. Modify OS startup function
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4. Add interrupt entry function.
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*************************************************/
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#include <sifive/smp.h>
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/* This is defined in sifive/platform.h, but that can't be included from
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* assembly. */
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#define CLINT_CTRL_ADDR 0x02000000
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#include <encoding.h>
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#include "register_para.h"
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#include "boot.h"
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.section .init
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.globl _begin
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.type _begin,@function
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_begin:
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.cfi_startproc
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.cfi_undefined ra
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.option push
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.option norelax
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la gp, __global_pointer$
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.option pop
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la sp, _sp
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/* Load data section */
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la a0, _data_lma
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la a1, _data
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la a2, _edata
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bgeu a1, a2, 2f
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1:
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lw t0, (a0)
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sw t0, (a1)
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addi a0, a0, 4
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addi a1, a1, 4
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bltu a1, a2, 1b
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2:
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/* Clear bss section */
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la a0, __bss_start
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la a1, _end
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bgeu a0, a1, 2f
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1:
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sw zero, (a0)
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addi a0, a0, 4
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bltu a0, a1, 1b
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2:
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/* Call global constructors */
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//la a0, __libc_fini_array
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//call atexit
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//call __libc_init_array
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#ifndef __riscv_float_abi_soft
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/* Enable FPU */
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li t0, MSTATUS_FS
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csrs mstatus, t0
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csrr t1, mstatus
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and t1, t1, t0
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beqz t1, 1f
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fssr x0
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1:
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#endif
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auipc ra, 0
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addi sp, sp, -16
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sw ra, 8(sp)
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/* argc = argv = 0 */
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li a0, 0
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li a1, 0
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call entry
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/* tail exit */
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1:
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j 1b
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.cfi_endproc
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.section .text.entry
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.align 2
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.global save_hw_context
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save_hw_context:
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/* save all from thread context */
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SAVE_X_REGISTERS
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/* save break thread stack to s0 */
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move s0, sp
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#ifdef TASK_ISOLATION
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csrr a0, mcause
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srli a0, a0, 31
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andi a0, a0, 0x1
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beqz a0, 1f
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#endif
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/* switch to interrupt stack */
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la sp, _sp
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1:
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/* interrupt handle */
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csrr a0, mcause
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csrr a1, mepc
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mv a2, sp
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call HandleTrap
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/* switch to from_thread stack */
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move sp, s0
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mv a0, fp
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call KTaskOsAssignAfterIrq
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j SwitchKTaskContextExit |