| /**************************************************************************** |
| * arch/risc-v/src/esp32c3-legacy/esp32c3_head.S |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The |
| * ASF licenses this file to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| #include <arch/irq.h> |
| |
| #include "riscv_internal.h" |
| #include "chip.h" |
| |
| /**************************************************************************** |
| * Public Symbols |
| ****************************************************************************/ |
| |
| .global __start |
| |
| /**************************************************************************** |
| * Section: .text |
| ****************************************************************************/ |
| |
| .section .text |
| |
| /**************************************************************************** |
| * Name: __start |
| ****************************************************************************/ |
| |
| __start: |
| .option push |
| .option norelax |
| |
| /* Set stack pointer to the idle thread stack */ |
| |
| la sp, _ebss |
| li t0, SMP_STACK_SIZE |
| add sp, sp, t0 |
| |
| /* Set gp pointer */ |
| |
| la gp, __global_pointer$ |
| |
| /* Disable all interrupts (i.e. timer, external) in mstatus */ |
| |
| csrw CSR_MSTATUS, zero |
| |
| .option pop |
| |
| /* Initialize the Machine Trap-Vector */ |
| |
| lui t0, %hi(_vector_table) |
| addi t0, t0, %lo(_vector_table) |
| csrw CSR_MTVEC, t0 |
| |
| /* Jump to __esp32c3_start */ |
| |
| jal x1, __esp32c3_start |
| |
| /* We shouldn't return from __esp32c3_start */ |
| |
| ret |
