/* * 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; 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; }Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marc Zyngier | 138 | 84.15% | 2 | 50.00% |
| Catalin Marinas | 22 | 13.41% | 1 | 25.00% |
| Suzuki K. Poulose | 4 | 2.44% | 1 | 25.00% |
| Total | 164 | 100.00% | 4 | 100.00% |
| Person | Tokens | Prop | Commits | CommitProp |
| Marc Zyngier | 151 | 85.31% | 3 | 60.00% |
| Catalin Marinas | 22 | 12.43% | 1 | 20.00% |
| Suzuki K. Poulose | 4 | 2.26% | 1 | 20.00% |
| Total | 177 | 100.00% | 5 | 100.00% |