1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * FPU context handling code for KVM. 7 * 8 * Copyright (C) 2015 Imagination Technologies Ltd. 9 */ 10 11#include <asm/asm.h> 12#include <asm/asm-offsets.h> 13#include <asm/fpregdef.h> 14#include <asm/mipsregs.h> 15#include <asm/regdef.h> 16 17/* preprocessor replaces the fp in ".set fp=64" with $30 otherwise */ 18#undef fp 19 20 .set noreorder 21 .set noat 22 23LEAF(__kvm_save_fpu) 24 .set push 25 SET_HARDFLOAT 26 .set fp=64 27 mfc0 t0, CP0_STATUS 28 sll t0, t0, 5 # is Status.FR set? 29 bgez t0, 1f # no: skip odd doubles 30 nop 31 sdc1 $f1, VCPU_FPR1(a0) 32 sdc1 $f3, VCPU_FPR3(a0) 33 sdc1 $f5, VCPU_FPR5(a0) 34 sdc1 $f7, VCPU_FPR7(a0) 35 sdc1 $f9, VCPU_FPR9(a0) 36 sdc1 $f11, VCPU_FPR11(a0) 37 sdc1 $f13, VCPU_FPR13(a0) 38 sdc1 $f15, VCPU_FPR15(a0) 39 sdc1 $f17, VCPU_FPR17(a0) 40 sdc1 $f19, VCPU_FPR19(a0) 41 sdc1 $f21, VCPU_FPR21(a0) 42 sdc1 $f23, VCPU_FPR23(a0) 43 sdc1 $f25, VCPU_FPR25(a0) 44 sdc1 $f27, VCPU_FPR27(a0) 45 sdc1 $f29, VCPU_FPR29(a0) 46 sdc1 $f31, VCPU_FPR31(a0) 471: sdc1 $f0, VCPU_FPR0(a0) 48 sdc1 $f2, VCPU_FPR2(a0) 49 sdc1 $f4, VCPU_FPR4(a0) 50 sdc1 $f6, VCPU_FPR6(a0) 51 sdc1 $f8, VCPU_FPR8(a0) 52 sdc1 $f10, VCPU_FPR10(a0) 53 sdc1 $f12, VCPU_FPR12(a0) 54 sdc1 $f14, VCPU_FPR14(a0) 55 sdc1 $f16, VCPU_FPR16(a0) 56 sdc1 $f18, VCPU_FPR18(a0) 57 sdc1 $f20, VCPU_FPR20(a0) 58 sdc1 $f22, VCPU_FPR22(a0) 59 sdc1 $f24, VCPU_FPR24(a0) 60 sdc1 $f26, VCPU_FPR26(a0) 61 sdc1 $f28, VCPU_FPR28(a0) 62 jr ra 63 sdc1 $f30, VCPU_FPR30(a0) 64 .set pop 65 END(__kvm_save_fpu) 66 67LEAF(__kvm_restore_fpu) 68 .set push 69 SET_HARDFLOAT 70 .set fp=64 71 mfc0 t0, CP0_STATUS 72 sll t0, t0, 5 # is Status.FR set? 73 bgez t0, 1f # no: skip odd doubles 74 nop 75 ldc1 $f1, VCPU_FPR1(a0) 76 ldc1 $f3, VCPU_FPR3(a0) 77 ldc1 $f5, VCPU_FPR5(a0) 78 ldc1 $f7, VCPU_FPR7(a0) 79 ldc1 $f9, VCPU_FPR9(a0) 80 ldc1 $f11, VCPU_FPR11(a0) 81 ldc1 $f13, VCPU_FPR13(a0) 82 ldc1 $f15, VCPU_FPR15(a0) 83 ldc1 $f17, VCPU_FPR17(a0) 84 ldc1 $f19, VCPU_FPR19(a0) 85 ldc1 $f21, VCPU_FPR21(a0) 86 ldc1 $f23, VCPU_FPR23(a0) 87 ldc1 $f25, VCPU_FPR25(a0) 88 ldc1 $f27, VCPU_FPR27(a0) 89 ldc1 $f29, VCPU_FPR29(a0) 90 ldc1 $f31, VCPU_FPR31(a0) 911: ldc1 $f0, VCPU_FPR0(a0) 92 ldc1 $f2, VCPU_FPR2(a0) 93 ldc1 $f4, VCPU_FPR4(a0) 94 ldc1 $f6, VCPU_FPR6(a0) 95 ldc1 $f8, VCPU_FPR8(a0) 96 ldc1 $f10, VCPU_FPR10(a0) 97 ldc1 $f12, VCPU_FPR12(a0) 98 ldc1 $f14, VCPU_FPR14(a0) 99 ldc1 $f16, VCPU_FPR16(a0) 100 ldc1 $f18, VCPU_FPR18(a0) 101 ldc1 $f20, VCPU_FPR20(a0) 102 ldc1 $f22, VCPU_FPR22(a0) 103 ldc1 $f24, VCPU_FPR24(a0) 104 ldc1 $f26, VCPU_FPR26(a0) 105 ldc1 $f28, VCPU_FPR28(a0) 106 jr ra 107 ldc1 $f30, VCPU_FPR30(a0) 108 .set pop 109 END(__kvm_restore_fpu) 110 111LEAF(__kvm_restore_fcsr) 112 .set push 113 SET_HARDFLOAT 114 lw t0, VCPU_FCR31(a0) 115 /* 116 * The ctc1 must stay at this offset in __kvm_restore_fcsr. 117 * See kvm_mips_csr_die_notify() which handles t0 containing a value 118 * which triggers an FP Exception, which must be stepped over and 119 * ignored since the set cause bits must remain there for the guest. 120 */ 121 ctc1 t0, fcr31 122 jr ra 123 nop 124 .set pop 125 END(__kvm_restore_fcsr) 126