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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io.c (1596B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
      4 */
      5#include <linux/export.h>
      6#include <linux/types.h>
      7#include <linux/io.h>
      8
      9/*
     10 * Copy data from IO memory space to "real" memory space.
     11 */
     12void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
     13{
     14	while (count && !IS_ALIGNED((unsigned long)from, 8)) {
     15		*(u8 *)to = __raw_readb(from);
     16		from++;
     17		to++;
     18		count--;
     19	}
     20
     21	while (count >= 8) {
     22		*(u64 *)to = __raw_readq(from);
     23		from += 8;
     24		to += 8;
     25		count -= 8;
     26	}
     27
     28	while (count) {
     29		*(u8 *)to = __raw_readb(from);
     30		from++;
     31		to++;
     32		count--;
     33	}
     34}
     35EXPORT_SYMBOL(__memcpy_fromio);
     36
     37/*
     38 * Copy data from "real" memory space to IO memory space.
     39 */
     40void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
     41{
     42	while (count && !IS_ALIGNED((unsigned long)to, 8)) {
     43		__raw_writeb(*(u8 *)from, to);
     44		from++;
     45		to++;
     46		count--;
     47	}
     48
     49	while (count >= 8) {
     50		__raw_writeq(*(u64 *)from, to);
     51		from += 8;
     52		to += 8;
     53		count -= 8;
     54	}
     55
     56	while (count) {
     57		__raw_writeb(*(u8 *)from, to);
     58		from++;
     59		to++;
     60		count--;
     61	}
     62}
     63EXPORT_SYMBOL(__memcpy_toio);
     64
     65/*
     66 * "memset" on IO memory space.
     67 */
     68void __memset_io(volatile void __iomem *dst, int c, size_t count)
     69{
     70	u64 qc = (u8)c;
     71
     72	qc |= qc << 8;
     73	qc |= qc << 16;
     74	qc |= qc << 32;
     75
     76	while (count && !IS_ALIGNED((unsigned long)dst, 8)) {
     77		__raw_writeb(c, dst);
     78		dst++;
     79		count--;
     80	}
     81
     82	while (count >= 8) {
     83		__raw_writeq(qc, dst);
     84		dst += 8;
     85		count -= 8;
     86	}
     87
     88	while (count) {
     89		__raw_writeb(c, dst);
     90		dst++;
     91		count--;
     92	}
     93}
     94EXPORT_SYMBOL(__memset_io);