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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mtfsfi.c (463B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/types.h>
      3#include <linux/errno.h>
      4#include <linux/uaccess.h>
      5
      6#include <asm/sfp-machine.h>
      7#include <math-emu/soft-fp.h>
      8
      9int
     10mtfsfi(unsigned int crfD, unsigned int IMM)
     11{
     12	u32 mask = 0xf;
     13
     14	if (!crfD)
     15		mask = 9;
     16
     17	__FPU_FPSCR &= ~(mask << ((7 - crfD) << 2));
     18	__FPU_FPSCR |= (IMM & 0xf) << ((7 - crfD) << 2);
     19
     20#ifdef DEBUG
     21	printk("%s: %d %x: %08lx\n", __func__, crfD, IMM, __FPU_FPSCR);
     22#endif
     23
     24	return 0;
     25}