arch/riscv/kvm/tlb.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2019 Western Digital Corporation or its affiliates.
   4  *
   5  * Authors:
   6  *     Anup Patel <anup.patel@wdc.com>
   7  */
   8
   9 #include <linux/linkage.h>
  10 #include <asm/asm.h>
  11
  12         .text
  13         .altmacro
  14         .option norelax
  15
  16         /*
  17          * Instruction encoding of hfence.gvma is:
  18          * HFENCE.GVMA rs1, rs2
  19          * HFENCE.GVMA zero, rs2
  20          * HFENCE.GVMA rs1
  21          * HFENCE.GVMA
  22          *
  23          * rs1!=zero and rs2!=zero ==> HFENCE.GVMA rs1, rs2
  24          * rs1==zero and rs2!=zero ==> HFENCE.GVMA zero, rs2
  25          * rs1!=zero and rs2==zero ==> HFENCE.GVMA rs1
  26          * rs1==zero and rs2==zero ==> HFENCE.GVMA
  27          *
  28          * Instruction encoding of HFENCE.GVMA is:
  29          * 0110001 rs2(5) rs1(5) 000 00000 1110011
  30          */
  31
  32 ENTRY(__kvm_riscv_hfence_gvma_vmid_gpa)
  33         /*
  34          * rs1 = a0 (GPA >> 2)
  35          * rs2 = a1 (VMID)
  36          * HFENCE.GVMA a0, a1
  37          * 0110001 01011 01010 000 00000 1110011
  38          */
  39         .word 0x62b50073
  40         ret
  41 ENDPROC(__kvm_riscv_hfence_gvma_vmid_gpa)
  42
  43 ENTRY(__kvm_riscv_hfence_gvma_vmid)
  44         /*
  45          * rs1 = zero
  46          * rs2 = a0 (VMID)
  47          * HFENCE.GVMA zero, a0
  48          * 0110001 01010 00000 000 00000 1110011
  49          */
  50         .word 0x62a00073
  51         ret
  52 ENDPROC(__kvm_riscv_hfence_gvma_vmid)
  53
  54 ENTRY(__kvm_riscv_hfence_gvma_gpa)
  55         /*
  56          * rs1 = a0 (GPA >> 2)
  57          * rs2 = zero
  58          * HFENCE.GVMA a0
  59          * 0110001 00000 01010 000 00000 1110011
  60          */
  61         .word 0x62050073
  62         ret
  63 ENDPROC(__kvm_riscv_hfence_gvma_gpa)
  64
  65 ENTRY(__kvm_riscv_hfence_gvma_all)
  66         /*
  67          * rs1 = zero
  68          * rs2 = zero
  69          * HFENCE.GVMA
  70          * 0110001 00000 00000 000 00000 1110011
  71          */
  72         .word 0x62000073
  73         ret
  74 ENDPROC(__kvm_riscv_hfence_gvma_all)