arch/arm64/kvm/hyp-init.S

   1 /*
   2  * Copyright (C) 2012,2013 - ARM Ltd
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/linkage.h>
  19
  20 #include <asm/assembler.h>
  21 #include <asm/kvm_arm.h>
  22 #include <asm/kvm_mmu.h>
  23
  24         .text
  25         .pushsection    .hyp.idmap.text, "ax"
  26
  27         .align  11
  28
  29 ENTRY(__kvm_hyp_init)
  30         ventry  __invalid               // Synchronous EL2t
  31         ventry  __invalid               // IRQ EL2t
  32         ventry  __invalid               // FIQ EL2t
  33         ventry  __invalid               // Error EL2t
  34
  35         ventry  __invalid               // Synchronous EL2h
  36         ventry  __invalid               // IRQ EL2h
  37         ventry  __invalid               // FIQ EL2h
  38         ventry  __invalid               // Error EL2h
  39
  40         ventry  __do_hyp_init           // Synchronous 64-bit EL1
  41         ventry  __invalid               // IRQ 64-bit EL1
  42         ventry  __invalid               // FIQ 64-bit EL1
  43         ventry  __invalid               // Error 64-bit EL1
  44
  45         ventry  __invalid               // Synchronous 32-bit EL1
  46         ventry  __invalid               // IRQ 32-bit EL1
  47         ventry  __invalid               // FIQ 32-bit EL1
  48         ventry  __invalid               // Error 32-bit EL1
  49
  50 __invalid:
  51         b       .
  52
  53         /*
  54          * x0: HYP boot pgd
  55          * x1: HYP pgd
  56          * x2: HYP stack
  57          * x3: HYP vectors
  58          */
  59 __do_hyp_init:
  60
  61         msr     ttbr0_el2, x0
  62
  63         mrs     x4, tcr_el1
  64         ldr     x5, =TCR_EL2_MASK
  65         and     x4, x4, x5
  66         ldr     x5, =TCR_EL2_FLAGS
  67         orr     x4, x4, x5
  68         msr     tcr_el2, x4
  69
  70         ldr     x4, =VTCR_EL2_FLAGS
  71         msr     vtcr_el2, x4
  72
  73         mrs     x4, mair_el1
  74         msr     mair_el2, x4
  75         isb
  76
  77         mrs     x4, sctlr_el2
  78         and     x4, x4, #SCTLR_EL2_EE   // preserve endianness of EL2
  79         ldr     x5, =SCTLR_EL2_FLAGS
  80         orr     x4, x4, x5
  81         msr     sctlr_el2, x4
  82         isb
  83
  84         /* MMU is now enabled. Get ready for the trampoline dance */
  85         ldr     x4, =TRAMPOLINE_VA
  86         adr     x5, target
  87         bfi     x4, x5, #0, #PAGE_SHIFT
  88         br      x4
  89
  90 target: /* We're now in the trampoline code, switch page tables */
  91         msr     ttbr0_el2, x1
  92         isb
  93
  94         /* Invalidate the old TLBs */
  95         tlbi    alle2
  96         dsb     sy
  97
  98         /* Set the stack and new vectors */
  99         kern_hyp_va     x2
 100         mov     sp, x2
 101         kern_hyp_va     x3
 102         msr     vbar_el2, x3
 103
 104         /* Hello, World! */
 105         eret
 106 ENDPROC(__kvm_hyp_init)
 107
 108         .ltorg
 109
 110         .popsection