91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2016 - ARM Ltd
|
||
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <asm/kvm_arm.h>
|
||
|
|
#include <asm/kvm_asm.h>
|
||
|
|
#include <asm/kvm_hyp.h>
|
||
|
|
|
||
|
|
u32 __hyp_text __init_stage2_translation(void)
|
||
|
|
{
|
||
|
|
u64 val = VTCR_EL2_FLAGS;
|
||
|
|
u64 parange;
|
||
|
|
u64 tmp;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Read the PARange bits from ID_AA64MMFR0_EL1 and set the PS
|
||
|
|
* bits in VTCR_EL2. Amusingly, the PARange is 4 bits, while
|
||
|
|
* PS is only 3. Fortunately, bit 19 is RES0 in VTCR_EL2...
|
||
|
|
*/
|
||
|
|
parange = read_sysreg(id_aa64mmfr0_el1) & 7;
|
||
|
|
if (parange > ID_AA64MMFR0_PARANGE_MAX)
|
||
|
|
parange = ID_AA64MMFR0_PARANGE_MAX;
|
||
|
|
val |= parange << 16;
|
||
|
|
|
||
|
|
/* Compute the actual PARange... */
|
||
|
|
switch (parange) {
|
||
|
|
case 0:
|
||
|
|
parange = 32;
|
||
|
|
break;
|
||
|
|
case 1:
|
||
|
|
parange = 36;
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
parange = 40;
|
||
|
|
break;
|
||
|
|
case 3:
|
||
|
|
parange = 42;
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
parange = 44;
|
||
|
|
break;
|
||
|
|
case 5:
|
||
|
|
default:
|
||
|
|
parange = 48;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* ... and clamp it to 40 bits, unless we have some braindead
|
||
|
|
* HW that implements less than that. In all cases, we'll
|
||
|
|
* return that value for the rest of the kernel to decide what
|
||
|
|
* to do.
|
||
|
|
*/
|
||
|
|
val |= 64 - (parange > 40 ? 40 : parange);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Check the availability of Hardware Access Flag / Dirty Bit
|
||
|
|
* Management in ID_AA64MMFR1_EL1 and enable the feature in VTCR_EL2.
|
||
|
|
*/
|
||
|
|
tmp = (read_sysreg(id_aa64mmfr1_el1) >> ID_AA64MMFR1_HADBS_SHIFT) & 0xf;
|
||
|
|
if (tmp)
|
||
|
|
val |= VTCR_EL2_HA;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Read the VMIDBits bits from ID_AA64MMFR1_EL1 and set the VS
|
||
|
|
* bit in VTCR_EL2.
|
||
|
|
*/
|
||
|
|
tmp = (read_sysreg(id_aa64mmfr1_el1) >> ID_AA64MMFR1_VMIDBITS_SHIFT) & 0xf;
|
||
|
|
val |= (tmp == ID_AA64MMFR1_VMIDBITS_16) ?
|
||
|
|
VTCR_EL2_VS_16BIT :
|
||
|
|
VTCR_EL2_VS_8BIT;
|
||
|
|
|
||
|
|
write_sysreg(val, vtcr_el2);
|
||
|
|
|
||
|
|
return parange;
|
||
|
|
}
|