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07f74314d1
Add qemu_semihosting_console_has_chardev() to query whether the semihosting console is backed by a chardev, and console_guestfd() to initialize a guest file descriptor as GuestFDConsole. These APIs enable callers to route semihosting I/O through a chardev rather than directly to host stdio. Reviewed-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com> Signed-off-by: Brian Cain <brian.cain@oss.qualcomm.com>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/*
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* Semihosting Console
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*
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* Copyright (c) 2019 Linaro Ltd
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef SEMIHOST_CONSOLE_H
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#define SEMIHOST_CONSOLE_H
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/**
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* qemu_semihosting_console_read:
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* @cs: CPUState
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* @buf: host buffer
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* @len: buffer size
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*
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* Receive at least one character from debug console. As this call may
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* block if no data is available we suspend the CPU and will re-execute the
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* instruction when data is there. Therefore two conditions must be met:
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*
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* - CPUState is synchronized before calling this function
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* - pc is only updated once the character is successfully returned
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*
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* Returns: number of characters read, OR cpu_loop_exit!
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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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* qemu_semihosting_console_write:
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* @buf: host buffer
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* @len: buffer size
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*
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* Write len bytes from buf to the debug console.
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*
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* Returns: number of bytes written -- this should only ever be short
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* on some sort of i/o error.
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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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* qemu_semihosting_console_block_until_ready:
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* @cs: CPUState
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*
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* If no data is available we suspend the CPU and will re-execute the
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* instruction when data is available.
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*/
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void qemu_semihosting_console_block_until_ready(CPUState *cs);
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/**
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* qemu_semihosting_console_ready:
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*
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* Return true if characters are available for read; does not block.
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*/
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bool qemu_semihosting_console_ready(void);
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/**
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* qemu_semihosting_console_has_chardev:
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*
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* Return true if the semihosting console is backed by a chardev.
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* When true, console I/O goes through the chardev rather than
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* host stdio.
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*/
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bool qemu_semihosting_console_has_chardev(void);
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#endif /* SEMIHOST_CONSOLE_H */
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