kernel/arch/s390/include/asm/fpu/internal.h

   1 /*
   2  * FPU state and register content conversion primitives
   3  *
   4  * Copyright IBM Corp. 2015
   5  * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
   6  */
   7
   8 #ifndef _ASM_S390_FPU_INTERNAL_H
   9 #define _ASM_S390_FPU_INTERNAL_H
  10
  11 #include <linux/string.h>
  12 #include <asm/ctl_reg.h>
  13 #include <asm/fpu/types.h>
  14
  15 static inline void save_vx_regs_safe(__vector128 *vxrs)
  16 {
  17         unsigned long cr0, flags;
  18
  19         flags = arch_local_irq_save();
  20         __ctl_store(cr0, 0, 0);
  21         __ctl_set_bit(0, 17);
  22         __ctl_set_bit(0, 18);
  23         asm volatile(
  24                 "       la      1,%0\n"
  25                 "       .word   0xe70f,0x1000,0x003e\n" /* vstm 0,15,0(1) */
  26                 "       .word   0xe70f,0x1100,0x0c3e\n" /* vstm 16,31,256(1) */
  27                 : "=Q" (*(struct vx_array *) vxrs) : : "1");
  28         __ctl_load(cr0, 0, 0);
  29         arch_local_irq_restore(flags);
  30 }
  31
  32 static inline void convert_vx_to_fp(freg_t *fprs, __vector128 *vxrs)
  33 {
  34         int i;
  35
  36         for (i = 0; i < __NUM_FPRS; i++)
  37                 fprs[i] = *(freg_t *)(vxrs + i);
  38 }
  39
  40 static inline void convert_fp_to_vx(__vector128 *vxrs, freg_t *fprs)
  41 {
  42         int i;
  43
  44         for (i = 0; i < __NUM_FPRS; i++)
  45                 *(freg_t *)(vxrs + i) = fprs[i];
  46 }
  47
  48 static inline void fpregs_store(_s390_fp_regs *fpregs, struct fpu *fpu)
  49 {
  50         fpregs->pad = 0;
  51         fpregs->fpc = fpu->fpc;
  52         if (MACHINE_HAS_VX)
  53                 convert_vx_to_fp((freg_t *)&fpregs->fprs, fpu->vxrs);
  54         else
  55                 memcpy((freg_t *)&fpregs->fprs, fpu->fprs,
  56                        sizeof(fpregs->fprs));
  57 }
  58
  59 static inline void fpregs_load(_s390_fp_regs *fpregs, struct fpu *fpu)
  60 {
  61         fpu->fpc = fpregs->fpc;
  62         if (MACHINE_HAS_VX)
  63                 convert_fp_to_vx(fpu->vxrs, (freg_t *)&fpregs->fprs);
  64         else
  65                 memcpy(fpu->fprs, (freg_t *)&fpregs->fprs,
  66                        sizeof(fpregs->fprs));
  67 }
  68
  69 #endif /* _ASM_S390_FPU_INTERNAL_H */