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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cpu.c (833B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Suspend support specific for mips.
      4 *
      5 * Copyright (C) 2009 Lemote Inc.
      6 * Author: Hu Hongbing <huhb@lemote.com>
      7 *	   Wu Zhangjin <wuzhangjin@gmail.com>
      8 */
      9#include <asm/sections.h>
     10#include <asm/fpu.h>
     11#include <asm/dsp.h>
     12
     13static u32 saved_status;
     14struct pt_regs saved_regs;
     15
     16void save_processor_state(void)
     17{
     18	saved_status = read_c0_status();
     19
     20	if (is_fpu_owner())
     21		save_fp(current);
     22
     23	save_dsp(current);
     24}
     25
     26void restore_processor_state(void)
     27{
     28	write_c0_status(saved_status);
     29
     30	if (is_fpu_owner())
     31		restore_fp(current);
     32
     33	restore_dsp(current);
     34}
     35
     36int pfn_is_nosave(unsigned long pfn)
     37{
     38	unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
     39	unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end));
     40
     41	return	(pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
     42}