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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fpu.h (1820B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __ASM_ALPHA_FPU_H
      3#define __ASM_ALPHA_FPU_H
      4
      5#include <asm/special_insns.h>
      6#include <uapi/asm/fpu.h>
      7
      8/* The following two functions don't need trapb/excb instructions
      9   around the mf_fpcr/mt_fpcr instructions because (a) the kernel
     10   never generates arithmetic faults and (b) call_pal instructions
     11   are implied trap barriers.  */
     12
     13static inline unsigned long
     14rdfpcr(void)
     15{
     16	unsigned long tmp, ret;
     17
     18#if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67)
     19	__asm__ __volatile__ (
     20		"ftoit $f0,%0\n\t"
     21		"mf_fpcr $f0\n\t"
     22		"ftoit $f0,%1\n\t"
     23		"itoft %0,$f0"
     24		: "=r"(tmp), "=r"(ret));
     25#else
     26	__asm__ __volatile__ (
     27		"stt $f0,%0\n\t"
     28		"mf_fpcr $f0\n\t"
     29		"stt $f0,%1\n\t"
     30		"ldt $f0,%0"
     31		: "=m"(tmp), "=m"(ret));
     32#endif
     33
     34	return ret;
     35}
     36
     37static inline void
     38wrfpcr(unsigned long val)
     39{
     40	unsigned long tmp;
     41
     42#if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67)
     43	__asm__ __volatile__ (
     44		"ftoit $f0,%0\n\t"
     45		"itoft %1,$f0\n\t"
     46		"mt_fpcr $f0\n\t"
     47		"itoft %0,$f0"
     48		: "=&r"(tmp) : "r"(val));
     49#else
     50	__asm__ __volatile__ (
     51		"stt $f0,%0\n\t"
     52		"ldt $f0,%1\n\t"
     53		"mt_fpcr $f0\n\t"
     54		"ldt $f0,%0"
     55		: "=m"(tmp) : "m"(val));
     56#endif
     57}
     58
     59static inline unsigned long
     60swcr_update_status(unsigned long swcr, unsigned long fpcr)
     61{
     62	/* EV6 implements most of the bits in hardware.  Collect
     63	   the acrued exception bits from the real fpcr.  */
     64	if (implver() == IMPLVER_EV6) {
     65		swcr &= ~IEEE_STATUS_MASK;
     66		swcr |= (fpcr >> 35) & IEEE_STATUS_MASK;
     67	}
     68	return swcr;
     69}
     70
     71extern unsigned long alpha_read_fp_reg (unsigned long reg);
     72extern void alpha_write_fp_reg (unsigned long reg, unsigned long val);
     73extern unsigned long alpha_read_fp_reg_s (unsigned long reg);
     74extern void alpha_write_fp_reg_s (unsigned long reg, unsigned long val);
     75
     76#endif /* __ASM_ALPHA_FPU_H */