cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hvc_riscv_sbi.c (1105B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (C) 2008 David Gibson, IBM Corporation
      4 * Copyright (C) 2012 Regents of the University of California
      5 * Copyright (C) 2017 SiFive
      6 */
      7
      8#include <linux/console.h>
      9#include <linux/err.h>
     10#include <linux/init.h>
     11#include <linux/moduleparam.h>
     12#include <linux/types.h>
     13
     14#include <asm/sbi.h>
     15
     16#include "hvc_console.h"
     17
     18static int hvc_sbi_tty_put(uint32_t vtermno, const char *buf, int count)
     19{
     20	int i;
     21
     22	for (i = 0; i < count; i++)
     23		sbi_console_putchar(buf[i]);
     24
     25	return i;
     26}
     27
     28static int hvc_sbi_tty_get(uint32_t vtermno, char *buf, int count)
     29{
     30	int i, c;
     31
     32	for (i = 0; i < count; i++) {
     33		c = sbi_console_getchar();
     34		if (c < 0)
     35			break;
     36		buf[i] = c;
     37	}
     38
     39	return i;
     40}
     41
     42static const struct hv_ops hvc_sbi_ops = {
     43	.get_chars = hvc_sbi_tty_get,
     44	.put_chars = hvc_sbi_tty_put,
     45};
     46
     47static int __init hvc_sbi_init(void)
     48{
     49	return PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_ops, 16));
     50}
     51device_initcall(hvc_sbi_init);
     52
     53static int __init hvc_sbi_console_init(void)
     54{
     55	hvc_instantiate(0, 0, &hvc_sbi_ops);
     56
     57	return 0;
     58}
     59console_initcall(hvc_sbi_console_init);