| /* |
| * Copyright (c) 2012-2018 LK Trusty Authors. All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files |
| * (the "Software"), to deal in the Software without restriction, |
| * including without limitation the rights to use, copy, modify, merge, |
| * publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, |
| * subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <arch/x86.h> |
| #include <arch/x86/mmu.h> |
| #include <err.h> |
| #include <kernel/mutex.h> |
| |
| #define UART_REGISTER_THR 0 /* WO Transmit Holding Register */ |
| #define UART_REGISTER_LSR 5 /* R/W Line Status Register */ |
| |
| typedef union { |
| struct { |
| uint8_t dr : 1; |
| uint8_t oe : 1; |
| uint8_t pe : 1; |
| uint8_t fe : 1; |
| uint8_t bi : 1; |
| uint8_t thre : 1; |
| uint8_t temt : 1; |
| uint8_t fifoe : 1; |
| } bits; |
| uint8_t data; |
| } uart_lsr_t; |
| |
| static spin_lock_t dputc_spin_lock = 0; |
| |
| static uint8_t serial_io_get_reg(uint64_t base_addr, uint32_t reg_id) { |
| return inp((uint16_t)base_addr + (uint16_t)reg_id); |
| } |
| |
| static void serial_io_set_reg(uint64_t base_addr, |
| uint32_t reg_id, |
| uint8_t val) { |
| outp((uint16_t)base_addr + (uint16_t)reg_id, val); |
| } |
| |
| static void uart_putc(char c) { |
| uart_lsr_t lsr; |
| |
| do { |
| lsr.data = serial_io_get_reg(TARGET_SERIAL_IO_BASE, UART_REGISTER_LSR); |
| } while (!lsr.bits.thre); |
| |
| serial_io_set_reg(TARGET_SERIAL_IO_BASE, UART_REGISTER_THR, c); |
| } |
| |
| void platform_dputc(char c) { |
| spin_lock_saved_state_t state; |
| spin_lock_save(&dputc_spin_lock, &state, SPIN_LOCK_FLAG_INTERRUPTS); |
| uart_putc(c); |
| spin_unlock_restore(&dputc_spin_lock, state, SPIN_LOCK_FLAG_INTERRUPTS); |
| } |
| |
| /* Do not accept any input */ |
| int platform_dgetc(char* c, bool wait) { |
| return ERR_NOT_SUPPORTED; |
| } |