mirror of https://gitee.com/openkylin/qemu.git
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/*
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* ARM Compatible Semihosting Console Support.
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*
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* Copyright (c) 2019 Linaro Ltd
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*
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* Currently ARM and RISC-V are unique in having support for
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* semihosting support in linux-user. So for now we implement the
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* common console API but just for arm and risc-v linux-user.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "qemu/osdep.h"
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#include "semihosting/console.h"
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#include "qemu.h"
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#include "user-internals.h"
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#include <termios.h>
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/*
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* For linux-user we can safely block. However as we want to return as
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* soon as a character is read we need to tweak the termio to disable
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* line buffering. We restore the old mode afterwards in case the
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* program is expecting more normal behaviour. This is slow but
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* nothing using semihosting console reading is expecting to be fast.
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*/
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int qemu_semihosting_console_read(CPUState *cs, void *buf, int len)
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{
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int ret;
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struct termios old_tio, new_tio;
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/* Disable line-buffering and echo */
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tcgetattr(STDIN_FILENO, &old_tio);
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new_tio = old_tio;
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new_tio.c_lflag &= (~ICANON & ~ECHO);
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new_tio.c_cc[VMIN] = 1;
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new_tio.c_cc[VTIME] = 0;
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tcsetattr(STDIN_FILENO, TCSANOW, &new_tio);
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ret = fread(buf, 1, len, stdin);
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/* restore config */
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tcsetattr(STDIN_FILENO, TCSANOW, &old_tio);
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return ret;
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}
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int qemu_semihosting_console_write(void *buf, int len)
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{
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return fwrite(buf, 1, len, stderr);
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}
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