LXR linux/arch/s390/include/asm/fpu/internal.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * FPU state and register content conversion primitives
   4 *
   5 * Copyright IBM Corp. 2015
   6 * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
   7 */
   8
   9#ifndef _ASM_S390_FPU_INTERNAL_H
  10#define _ASM_S390_FPU_INTERNAL_H
  11
  12#include <linux/string.h>
  13#include <asm/ctl_reg.h>
  14#include <asm/fpu/types.h>
  15
  16static inline void save_vx_regs(__vector128 *vxrs)
  17{
  18        asm volatile(
  19                "       la      1,%0\n"
  20                "       .word   0xe70f,0x1000,0x003e\n" /* vstm 0,15,0(1) */
  21                "       .word   0xe70f,0x1100,0x0c3e\n" /* vstm 16,31,256(1) */
  22                : "=Q" (*(struct vx_array *) vxrs) : : "1");
  23}
  24
  25static inline void convert_vx_to_fp(freg_t *fprs, __vector128 *vxrs)
  26{
  27        int i;
  28
  29        for (i = 0; i < __NUM_FPRS; i++)
  30                fprs[i] = *(freg_t *)(vxrs + i);
  31}
  32
  33static inline void convert_fp_to_vx(__vector128 *vxrs, freg_t *fprs)
  34{
  35        int i;
  36
  37        for (i = 0; i < __NUM_FPRS; i++)
  38                *(freg_t *)(vxrs + i) = fprs[i];
  39}
  40
  41static inline void fpregs_store(_s390_fp_regs *fpregs, struct fpu *fpu)
  42{
  43        fpregs->pad = 0;
  44        fpregs->fpc = fpu->fpc;
  45        if (MACHINE_HAS_VX)
  46                convert_vx_to_fp((freg_t *)&fpregs->fprs, fpu->vxrs);
  47        else
  48                memcpy((freg_t *)&fpregs->fprs, fpu->fprs,
  49                       sizeof(fpregs->fprs));
  50}
  51
  52static inline void fpregs_load(_s390_fp_regs *fpregs, struct fpu *fpu)
  53{
  54        fpu->fpc = fpregs->fpc;
  55        if (MACHINE_HAS_VX)
  56                convert_fp_to_vx(fpu->vxrs, (freg_t *)&fpregs->fprs);
  57        else
  58                memcpy(fpu->fprs, (freg_t *)&fpregs->fprs,
  59                       sizeof(fpregs->fprs));
  60}
  61
  62#endif /* _ASM_S390_FPU_INTERNAL_H */
  63