console.h (1513B)
1 /* 2 * Semihosting Console 3 * 4 * Copyright (c) 2019 Linaro Ltd 5 * 6 * SPDX-License-Identifier: GPL-2.0-or-later 7 */ 8 9 #ifndef SEMIHOST_CONSOLE_H 10 #define SEMIHOST_CONSOLE_H 11 12 #include "cpu.h" 13 14 /** 15 * qemu_semihosting_console_read: 16 * @cs: CPUState 17 * @buf: host buffer 18 * @len: buffer size 19 * 20 * Receive at least one character from debug console. As this call may 21 * block if no data is available we suspend the CPU and will re-execute the 22 * instruction when data is there. Therefore two conditions must be met: 23 * 24 * - CPUState is synchronized before calling this function 25 * - pc is only updated once the character is successfully returned 26 * 27 * Returns: number of characters read, OR cpu_loop_exit! 28 */ 29 int qemu_semihosting_console_read(CPUState *cs, void *buf, int len); 30 31 /** 32 * qemu_semihosting_console_write: 33 * @buf: host buffer 34 * @len: buffer size 35 * 36 * Write len bytes from buf to the debug console. 37 * 38 * Returns: number of bytes written -- this should only ever be short 39 * on some sort of i/o error. 40 */ 41 int qemu_semihosting_console_write(void *buf, int len); 42 43 /* 44 * qemu_semihosting_console_block_until_ready: 45 * @cs: CPUState 46 * 47 * If no data is available we suspend the CPU and will re-execute the 48 * instruction when data is available. 49 */ 50 void qemu_semihosting_console_block_until_ready(CPUState *cs); 51 52 /** 53 * qemu_semihosting_console_ready: 54 * 55 * Return true if characters are available for read; does not block. 56 */ 57 bool qemu_semihosting_console_ready(void); 58 59 #endif /* SEMIHOST_CONSOLE_H */