147 lines
2.7 KiB
C
147 lines
2.7 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <types.h>
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#include <pci.h>
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#include <uart16550.h>
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#include <shell.h>
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#include <timer.h>
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#include <vuart.h>
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#include <logmsg.h>
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#include <acrn_hv_defs.h>
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#include <vm.h>
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struct hv_timer console_timer;
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#define CONSOLE_KICK_TIMER_TIMEOUT 40UL /* timeout is 40ms*/
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/* Switching key combinations for shell and uart console */
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#define GUEST_CONSOLE_TO_HV_SWITCH_KEY 0 /* CTRL + SPACE */
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uint16_t console_vmid = ACRN_INVALID_VMID;
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void console_init(void)
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{
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uart16550_init();
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}
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void console_putc(const char *ch)
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{
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(void)uart16550_puts(ch, 1U);
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}
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size_t console_write(const char *s, size_t len)
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{
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return uart16550_puts(s, len);
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}
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char console_getc(void)
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{
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return uart16550_getc();
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}
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/*
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* @post return != NULL
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*/
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struct acrn_vuart *vm_console_vuart(struct acrn_vm *vm)
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{
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return &vm->vuart[0];
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}
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/**
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* @pre vu != NULL
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* @pre vu->active == true
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*/
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void vuart_console_rx_chars(struct acrn_vuart *vu)
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{
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char ch = -1;
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/* Get data from physical uart */
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ch = uart16550_getc();
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if (ch == GUEST_CONSOLE_TO_HV_SWITCH_KEY) {
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/* Switch the console */
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console_vmid = ACRN_INVALID_VMID;
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printf("\r\n\r\n ---Entering ACRN SHELL---\r\n");
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}
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if (ch != -1) {
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vuart_putchar(vu, ch);
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vuart_toggle_intr(vu);
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}
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}
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/**
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* @pre vu != NULL
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*/
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void vuart_console_tx_chars(struct acrn_vuart *vu)
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{
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char c;
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while ((c = vuart_getchar(vu)) != -1) {
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printf("%c", c);
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}
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}
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struct acrn_vuart *vuart_console_active(void)
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{
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struct acrn_vm *vm = NULL;
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struct acrn_vuart *vu = NULL;
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if (console_vmid < CONFIG_MAX_VM_NUM) {
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vm = get_vm_from_vmid(console_vmid);
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if (is_valid_vm(vm)) {
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vu = vm_console_vuart(vm);
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} else {
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/* Console vm is invalid, switch back to HV-Shell */
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console_vmid = ACRN_INVALID_VMID;
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}
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}
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return (vu && vu->active) ? vu : NULL;
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}
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static void console_timer_callback(__unused void *data)
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{
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struct acrn_vuart *vu;
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/* Kick HV-Shell and Uart-Console tasks */
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vu = vuart_console_active();
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if (vu != NULL) {
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/* serial Console Rx operation */
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vuart_console_rx_chars(vu);
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/* serial Console Tx operation */
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vuart_console_tx_chars(vu);
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} else {
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shell_kick();
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}
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}
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void console_setup_timer(void)
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{
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uint64_t period_in_cycle, fire_tsc;
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period_in_cycle = CYCLES_PER_MS * CONSOLE_KICK_TIMER_TIMEOUT;
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fire_tsc = rdtsc() + period_in_cycle;
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initialize_timer(&console_timer,
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console_timer_callback, NULL,
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fire_tsc, TICK_MODE_PERIODIC, period_in_cycle);
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/* Start an periodic timer */
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if (add_timer(&console_timer) != 0) {
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pr_err("Failed to add console kick timer");
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}
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}
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void suspend_console(void)
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{
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del_timer(&console_timer);
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}
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void resume_console(void)
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{
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console_setup_timer();
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}
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