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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copy-paste.h (817B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Copyright 2016-17 IBM Corp.
      4 */
      5#include <asm/ppc-opcode.h>
      6#include <asm/reg.h>
      7
      8/*
      9 * Copy/paste instructions:
     10 *
     11 *	copy RA,RB
     12 *		Copy contents of address (RA) + effective_address(RB)
     13 *		to internal copy-buffer.
     14 *
     15 *	paste RA,RB
     16 *		Paste contents of internal copy-buffer to the address
     17 *		(RA) + effective_address(RB)
     18 */
     19static inline int vas_copy(void *crb, int offset)
     20{
     21	asm volatile(PPC_COPY(%0, %1)";"
     22		:
     23		: "b" (offset), "b" (crb)
     24		: "memory");
     25
     26	return 0;
     27}
     28
     29static inline int vas_paste(void *paste_address, int offset)
     30{
     31	u32 cr;
     32
     33	cr = 0;
     34	asm volatile(PPC_PASTE(%1, %2)";"
     35		"mfocrf %0, 0x80;"
     36		: "=r" (cr)
     37		: "b" (offset), "b" (paste_address)
     38		: "memory", "cr0");
     39
     40	/* We mask with 0xE to ignore SO */
     41	return (cr >> CR0_SHIFT) & 0xE;
     42}